Patent Publication Number: US-2023152855-A1

Title: Support assembly, foldable display screen and terminal device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is based on and claims priority to Chinese Patent Application No. 202111356835.7, filed on Nov. 16, 2021, the entire content of which is incorporated herein by reference. 
     BACKGROUND 
     With ongoing development of electronic products, a foldable display screen is widely used in a terminal device to provide a larger screen area while maintaining a more compact device size. For example, the foldable display screen may be used in a mobile phone or in a computer, etc. For a terminal device which is foldable in form, an assembly to provide support for the display screen is essential, and the performance of a hinge used when folding the display screen may directly affect functions and user experience of the terminal device. In the related art, the support assembly of the foldable display screen needs to be provided with linkage and synchronization structure, which is not conducive to a lightweight design of the terminal device. 
     SUMMARY 
     The present disclosure relates to a field of foldable screens, and more particularly to a support assembly, a foldable display screen and a terminal device. 
     Embodiments of a first aspect of the present disclosure provide a support assembly. 
     The support assembly according to the embodiments of the present disclosure includes a first support member, a second support member and a third support member. The second support member has a first side and a second side. The first support member is rotatably arranged to the first side of the second support member, and the third support member is rotatably arranged to the second side of the second support member. The first support member is movable between a first locked position and a first unlocked position. The first support member is configured to rotate relative to the second support member, and the second support member and the third support member are configured to be fixed relative to each other when the first support member is in the first locked position. The second support member is configured to rotate relative to the third support member when the first support member is in the first unlocked position. 
     Embodiments of a second aspect of the present disclosure further provide a foldable display screen. 
     The foldable display screen according to the embodiments of the present disclosure includes a display panel and a support assembly, and at least a part of the display panel is arranged on the support assembly. The support assembly includes a first support member, a second support member and a third support member. The second support member has a first side and a second side. The first support member is rotatably arranged to the first side of the second support member, and the third support member is rotatably arranged to the second side of the second support member. The first support member is movable between a first locked position and a first unlocked position. The first support member is configured to rotate relative to the second support member, and the second support member and the third support member are configured to be fixed relative to each other when the first support member is in the first locked position. The second support member is configured to rotate relative to the third support member when the first support member is in the first unlocked position. 
     Embodiments of a third aspect of the present disclosure further provide a terminal device. 
     The terminal device according to embodiments of the present disclosure includes: a housing; and a foldable display screen arranged to the housing. The foldable display screen includes a display panel and a support assembly, and at least a part of the display panel is arranged on the support assembly. The support assembly includes a first support member, a second support member and a third support member. The second support member has a first side and a second side. The first support member is rotatably arranged to the first side of the second support member, and the third support member is rotatably arranged to the second side of the second support member. The first support member is movable between a first locked position and a first unlocked position. The first support member is configured to rotate relative to the second support member, and the second support member and the third support member are configured to be fixed relative to each other when the first support member is in the first locked position. The second support member is configured to rotate relative to the third support member when the first support member is in the first unlocked position. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic view of a support assembly in a first state according to an embodiment of the present disclosure. 
         FIG.  2    is a schematic view of a first support member, a second support member, a third support member and a fourth support member in  FIG.  1   . 
         FIG.  3    is a schematic view of a support assembly in a second state according to an embodiment of the present disclosure. 
         FIG.  4    is a schematic view of a support assembly in a third state according to an embodiment of the present disclosure. 
         FIG.  5    is a schematic view of a support assembly in a fourth state according to an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Embodiments of the present disclosure are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary, are merely used to explain the present disclosure, and cannot be construed to limit the present disclosure. 
     In a related art, a terminal device with a foldable display screen includes a plurality of support plates, and linkage and synchronization structures need to be between the respective support plates. On one hand, the existence of the linkage and synchronization structures causes much internal space of the terminal device to be occupied by the foldable display screen, thereby resulting in a large thickness of the terminal device. On the other hand, the linkage and synchronization structures increase a weight of the foldable display screen, thereby resulting in a relatively large weight of the terminal device. In addition, in order to reduce the number of the linkage and synchronization structures and hence reduce the weight of the terminal device, the number of the support plates is often set to be small, thereby resulting in a poor support effect for a display panel of the foldable display screen. 
     Embodiments of the present disclosure provide a support assembly with a small size and a light weight. 
     Embodiments of the present disclosure further provide a foldable display screen with a thin thickness and a light weight. 
     Embodiments of the present disclosure further provide a terminal device with a thin thickness and a light weight. 
     The support assembly according to the embodiments of the present disclosure includes a first support member, a second support member and a third support member. The first support member is rotatably arranged to one side of the second support member, and the third support member is rotatably arranged to the other side of the second support member. The first support member is movable between a first locked position and a first unlocked position. When the first support member is in the first locked position, the first support member is configured to rotate relative to the second support member, and the second support member and the third support member are fixed relative to each other. When the first support member is in the first unlocked position, the second support member is configured to rotate relative to the third support member. 
     The support assembly of the embodiments of the present disclosure only needs to form rotation pairs between the first support member and the second support member and between the second support member and the third support member, so as to achieve the rotation of the first support member relative to the second support member and the rotation of the second support member relative to the third support member. Further, a stop structure is arranged among the first support member, the second support member and the third support member, such that when the first support member is in the first locked position, the first support member can rotate relative to the second support member, and the second support member and the third support member are fixed relative to each other, and such that when the first support member is in the first unlocked position, the second support member can rotate relative to the third support member, without providing the linkage and synchronization structures between the respective support members. Compared to the related art, a size and a weight of the support assembly are greatly reduced, such that a thickness and a weight of the foldable display screen can be reduced, and further, a thickness and a weight of the terminal device with the foldable display screen can be reduced, which is conducive to a lightweight design of the terminal device with the foldable display screen. 
     In some embodiments, the support assembly further includes a fourth support member rotatably arranged to a side of the third support member away from the second support member. When the first support member is in the first locked position, the third support member and the fourth support member are fixed relative to each other. The second support member is movable between a second locked position and a second unlocked position. When the second support member is in the second locked position, the first support member is in the first unlocked position, and the third support member and the fourth support member are fixed relative to each other. When the second support member is in the second unlocked position, the third support member is configured to rotate relative to the fourth support member. 
     In some embodiments, the first support member includes a first support body and a first fitting portion arranged on the first support body, the second support member includes a second support body and a second fitting portion arranged on the second support body, and the second fitting portion is rotatably arranged to the first fitting portion such that the first support member is rotatably arranged to the second support member; and/or the second support member includes a second support body and a third fitting portion arranged on the second support body, the third support member includes a third support body and a fourth fitting portion arranged on the third support body, and the fourth fitting portion is rotatably arranged to the third fitting portion such that the third support member is rotatably arranged to the second support member. 
     In some embodiments, the first fitting portion overhangs an edge of the first support body along a direction towards the second support body, and the second fitting portion overhangs an edge of the second support body along a direction towards the first support body; 
     and/or the third fitting portion overhangs an edge of the second support body along a direction towards the third support body, and the fourth fitting portion overhangs an edge of the third support body along a direction towards the second support body. 
     In some embodiments, one of the first fitting portion and the second fitting portion is a first sliding block, the other one of the first fitting portion and the second fitting portion is a first sliding piece, the first sliding block is provided with a first sliding slot having an opening facing the first sliding piece, and a part of the first sliding piece is slidably arranged in the first sliding slot along an arrangement direction of the first support body and the second support body through the opening of the first sliding slot; and/or one of the third fitting portion and the fourth fitting portion is a second sliding block, the other one of the third fitting portion and the fourth fitting portion is a second sliding piece, the second sliding block is provided with a second sliding slot having an opening facing the second sliding piece, and a part of the second sliding piece is slidably arranged in the second sliding slot along an arrangement direction of the second support body and the third support body through the opening of the second sliding slot. 
     In some embodiments, the first sliding piece is an arc sliding piece, and the first sliding piece is fitted with the first sliding slot; and/or the second sliding piece is an arc sliding piece, and the second sliding piece is fitted with the second sliding slot. 
     In some embodiments, the third support member includes a fifth fitting portion arranged on the third support body, the fourth support member includes a fourth support body and a sixth fitting portion arranged on the fourth support body, the sixth fitting portion is rotatably arranged to the fifth fitting portion such that the fourth support member is rotatably arranged to the third support member. 
     In some embodiments, the fifth fitting portion overhangs an edge of the third support body along a direction towards the fourth support body, and the sixth fitting portion overhangs an edge of the fourth support body along a direction towards the third support body. 
     In some embodiments, one of the fifth fitting portion and the sixth fitting portion is a third sliding block, the other one of the fifth fitting portion and the sixth fitting portion is a third sliding piece, the third sliding block is provided with a third sliding slot having an opening facing the third sliding piece, and a part of the third sliding piece is slidably arranged in the third sliding slot along an arrangement direction of the third support body and the fourth support body through the opening of the third sliding slot. 
     In some embodiments, the third sliding piece is an arc sliding piece, and the third sliding piece is fitted with the third sliding slot. 
     In some embodiments, the first support member includes a first stop portion arranged on the first support body, and the third support member includes a second stop portion arranged on the third support body. When the first support member is in the first locked position, the first stop portion and the second support member are spaced apart from each other such that the first support member is configured to rotate relative to the second support member, and one of the first stop portion and the second stop portion is configured to abut against the other one of the first stop portion and the second stop portion such that the second support member and the third support member are fixed relative to each other. When the first support member is in the first unlocked position, the second stop portion disengages from the first stop portion such that the second support member is configured to rotate relative to the third support member. 
     In some embodiments, the first stop portion overhangs an edge of the first support body along a direction towards the third support body, and the second stop portion overhangs an edge of the third support body along a direction towards the first support body. 
     In some embodiments, one of the first stop portion and the second stop portion is a first stop piece, the first stop piece is provided with a first relief notch, and the other one of the first stop portion and the second stop portion is a first stop block. When the first support member is in the first locked position, the first stop block is configured to abut against the first stop piece. When the first support member is in the first unlocked position, the first stop block is located in the first relief notch, such that the second stop portion disengages from the first stop portion. 
     In some embodiments, the second support member includes a third stop portion arranged on the second support body, and the fourth support member includes a fourth stop portion arranged on the fourth support body. When the second support member is in the second locked position, the third stop portion and the third support member are spaced apart from each other such that the second support member is configured to rotate relative to the third support member, and one of the third stop portion and the fourth stop portion is configured to abut against the other one of the third stop portion and the fourth stop portion such that the third support member and the fourth support member are fixed relative to each other. When the second support member is in the second unlocked position, the fourth stop portion disengages from the third stop portion such that the third support member is configured to rotate relative to the fourth support member. 
     In some embodiments, the third stop portion overhangs an edge of the second support body along a direction towards the fourth support body, and the fourth stop portion overhangs an edge of the fourth support body along a direction towards the second support body. 
     In some embodiments, one of the third stop portion and the fourth stop portion is a second stop piece, the second stop piece is provided with a second relief notch, and the other one of the third stop portion and the fourth stop portion is a second stop block. When the second support member is in the second locked position, the second stop block is configured to abut against the second stop piece. When the second support member is in the second unlocked position, the second stop block is located in the second relief notch, such that the fourth stop portion disengages from the third stop portion. 
     In some embodiments, the third fitting portion is the second sliding piece, the third stop portion is the second stop piece, and the second sliding piece is provided with the second stop piece. The second sliding piece includes a fitting section and a stop section connected with each other, a part of the fitting section is slidably arranged in the second sliding slot along the arrangement direction of the second support body and the third support body, and the second relief notch is formed in the stop section. When the second support member is in the second locked position, the second stop block is configured to abut against the stop section. 
     In some embodiments, the first support body, the second support body and the third support body are arranged along a width direction of the first support body, the first fitting portion and the first stop portion are spaced apart from each other along a length direction of the first support body, and the third fitting portion is located between the first fitting portion and the first stop portion in the length direction of the first support body; and/or the third support body and the fourth support body are arranged along a width direction of the first support body, the sixth fitting portion and the first stop portion are spaced apart from each other along the length direction of the first support body, and the third fitting portion is located between the sixth fitting portion and the first stop portion in the length direction of the first support body. 
     In some embodiments, the second stop portion is arranged on the fourth fitting portion; and/or the fourth stop portion is arranged on the sixth fitting portion. 
     In some embodiments, the second stop portion and the fourth fitting portion are integrally formed; and/or the fourth stop portion and the sixth fitting portion are integrally formed. 
     In some embodiments, the second stop portion overhangs an edge of the fourth fitting portion along the length direction of the first support body; and/or the fourth stop portion overhangs an edge of the sixth fitting portion along the length direction of the first support body. 
     In some embodiments, when the first support member is in the first unlocked position, the first stop portion abuts against the second support body such that the first support member and the second support member are fixed relative to each other. 
     In some embodiments, when the second support member is in the second unlocked position, the third stop portion abuts against the third support member such that the second support member and the third support member are fixed relative to each other. 
     In some embodiments, wherein the structures of the first support member and the third support member are identical, and the structures of the second support member and the fourth support member are identical. 
     The foldable display screen of the embodiments of the present disclosure includes a display panel and a support assembly, and at least a part of the display panel is arranged on the support assembly. 
     Specifically, the support assembly is arranged at a side of the display panel where no image is displayed. The entire display panel may be arranged on the support assembly, such that the support assembly is used to support the display panel, and the support assembly is further used to achieve the folding of the display panel. Of course, only a part of the display panel may also be arranged on the support assembly, such that the support assembly is used to support the part of the display panel, and the support assembly is further used to achieve the folding of the part of the display panel. 
     The foldable display screen according to the embodiments of the present disclosure has advantages of a thin thickness, a light weight and the like. 
     The terminal device according to embodiments of the present disclosure includes: a housing; and the foldable display screen according to any one of the above embodiments. The foldable display screen is arranged to the housing. 
     The terminal device according to the embodiments of the present disclosure has advantages of a thin thickness, a light weight and the like. 
     The foldable display screen may be a display screen of a mobile phone, a tablet computer or another terminal device. The display panel is a bendable and flexible display panel. 
     The support assembly of the embodiments of the present disclosure is described below with reference to the accompanying drawings. 
     As shown in  FIGS.  1  to  5   , the support assembly  100  according to the embodiments of the present disclosure includes a first support member  1 , a second support member  2  and a third support member  3 . The first support member  1  is rotatably arranged to one side of the second support member  2 , and the third support member  3  is rotatably arranged to the other side of the second support member  2 . The first support member  1  is movable between a first locked position and a first unlocked position. When the first support member  1  is in the first locked position, the first support member  1  can rotate relative to the second support member  2 , and the second support member  2  and the third support member  3  are fixed relative to each other. When the first support member  1  is in the first unlocked position, the second support member  2  can rotate relative to the third support member  3 . 
     The first support member  1  being configured to rotate relative to the second support member  2 , may be understood as follows: when the display panel needs to be folded, the first support member  1  rotates relative to the second support member  2 ; when the display panel doesn&#39;t need to be folded, the first support member  1  may rotate relative to the second support member  2 , or the first support member  1  may also not rotate relative to the second support member  2 . 
     The second support member  2  being configured to rotate relative to the third support member  3 , may be understood as follows: when the display panel needs to be folded, the second support member  2  rotates relative to the third support member  3 ; when the display panel doesn&#39;t need to be folded, the second support member  2  may rotate relative to the third support member  3 , or the second support member  2  may also be fixed relative to the third support member  3 . 
     In order to more easily understand the technical solution of the present disclosure, the technical solution of the present disclosure is further described by taking an example below, in which arrangement directions of the first support member  1  and the second support member  2  are consistent with a left-right direction, and a rotation axis of the first support member  1  is consistent with a front-rear direction. A set of coordinates showing the left-right direction and the front-rear direction referenced herein are shown in  FIGS.  1  to  4   . 
     For example, as shown in  FIGS.  1  and  2   , the first support member  1  is rotatably arranged to a left side of the second support member  2 , and the third support member  3  is rotatably arranged to a right side of the second support member  2 . The first support member  1  has a first rotation axis extending along the front-rear direction, and the second support member  2  has a second rotation axis extending along the front-rear direction. When the first support member  1  is in a first locked position, the first support member  1  can rotate around the first rotation axis relative to the second support member  2 . When the first support member  1  is in a first unlocked position, the second support member  2  can rotate around the second rotation axis relative to the third support member  3 . 
     The foldable display screen according to the embodiments of the present disclosure has a following use process. 
     When the foldable display screen needs to be bent and folded, first, the first support member  1  is in the first locked position, and the first support member  1  rotates relative to the second support member  2  around the first rotation axis by a first preset angle, such that a part of the display panel corresponding to the first support member  1  is bent and folded by the first preset angle. In this case, the second support member  2  and the third support member  3  are fixed relative to each other, and corresponding parts of the display panel (a part corresponding to the second support member  2  and a part corresponding to the third support member  3 ) are stably supported by the second support member  2  and the third support member  3 . Then, the first support member  1  is moved to the first unlocked position, and the second support member  2  rotates relative to the third support member  3  around the second rotation axis by a second preset angle, such that the part of the display panel corresponding to the second support member  2  is bent and folded by the second preset angle which may be equal to the first preset angle, and the second support member  2  is configured to drive the part of the display panel corresponding to the first support member  1  to be bent and folded by the second preset angle relative to the third support member  3 , such that the part of the display panel corresponding to the first support member  1  is bent and folded by the sum of the first preset angle and the second preset angle relative to the third support member  3 . Finally, the folding of at least part of the foldable display screen is completed. 
     When the foldable display screen needs to be unfolded, first, the first support member  1  is in the first unlocked position, and the second support member  2  rotates relative to the third support member  3  around the second rotation axis by the second preset angle, such that the part of the display panel corresponding to the second support member  2  is unfolded, and the second support member  2  is configured to drive the part of the display panel corresponding to the first support member  1  to rotate relative to the third support member  3  by the second preset angle. Then, the first support member  1  is moved to the first locked position, such that the second support member  2  and the third support member  3  are fixed relative to each other, and the corresponding parts of the display panel (the part corresponding to the second support member  2  and the part corresponding to the third support member  3 ) are stably supported by the second support member  2  and the third support member  3 . Moreover, the first support member  1  rotates relative to the second support member  2  around the first rotation axis by the first preset angle, such that the part of the display panel corresponding to the first support member  1  is unfolded. Finally, the unfolding of at least part of the foldable display screen is completed. 
     The support assembly  100  of the embodiments of the present disclosure only needs to form rotation pairs between the first support member  1  and the second support member  2  and between the second support member  2  and the third support member  3 , so as to achieve the rotation of the first support member  1  relative to the second support member  2  and the rotation of the second support member  2  relative to the third support member  3 . Further, a stop structure is arranged among the first support member  1 , the second support member  2  and the third support member  3 , such that when the first support member  1  is in the first locked position, the first support member  1  can rotate relative to the second support member  2 , and the second support member  2  and the third support member  3  are fixed relative to each other, and such that when the first support member  1  is in the first unlocked position, the second support member  2  can rotate relative to the third support member  3 , without providing the linkage and synchronization structures between the respective support members. Compared to the related art, a size and a weight of the support assembly  100  are greatly reduced, such that a thickness and a weight of the foldable display screen can be reduced, and further, a thickness and a weight of the terminal device with the foldable display screen can be reduced, which is conducive to a lightweight design of the terminal device with the foldable display screen. 
     Thus, the support assembly  100  of the embodiments of the present disclosure has advantages of a small size and a light weight. Therefore, the foldable display screen with the support assembly  100  of the embodiments of the present disclosure also has advantages of a small size and a light weight. 
     In addition, after the size and weight of the support assembly are reduced, the number of the support members may be appropriately increased, such that the support assembly may better support the display panel, which is used to improve the user experience. 
     In some embodiments, as shown in  FIGS.  1  to  5   , the support assembly  100  also includes a fourth support member  4  rotatably arranged to a side of the third support member  3  away from the second support member  2 . When the first support member  1  is in the first locked position, the third support member  3  is fixed relative to the fourth support member  4 . 
     The second support member  2  is movable between a second locked position and a second unlocked position. When the second support member  2  is in the second locked position, the first support member  1  is in the first unlocked position, and the third support member  3  and the fourth support member  4  are fixed relative to each other. When the second support member  2  is in the second unlocked position, the third support member  3  can rotate relative to the fourth support member  4 . 
     The third support member  3  being configured to rotate relative to the fourth support member  4 , may be understood as follows: when the display panel needs to be folded, the third support member  3  rotates relative to the fourth support member  4 ; when the display panel does not need to be folded, the third support member  3  may rotate relative to the fourth support member  4 , or the third support member  3  may also be fixed relative to the fourth support member  4 . 
     As shown in  FIGS.  1  and  2   , the fourth support member  4  is rotatably arranged to a right side of the third support member  3 . The third support member  3  has a third rotation axis extending along the front-rear direction. When the second support member  2  is in the second locked position, the first support member  1  is in the first unlocked position, and the second support member  2  can rotate relative to the third support member  3  around the second rotation axis. When the second support member  2  is in the second unlocked position, the third support member  3  can rotate around the third rotation axis relative to the fourth support member  4 . 
     When the foldable display screen needs to be bent and folded, first, the first support member  1  is in the first locked position, such that the part of the display panel corresponding to the first support member  1  is bent and folded by the first preset angle. In this case, the second support member  2  and the third support member  3  as well as the third support member  3  and the fourth support member  4  are fixed relative to each other, and the corresponding parts of the display panel (the part corresponding to the second support member  2 , the part corresponding to the third support member  3  and a part corresponding to the fourth support member  4 ) are stably supported by the second support member  2 , the third support member  3  and the fourth support member  4 . 
     Then, the second support member  2  is moved to the second locked position, and the first support member  1  is in the first unlocked position in this case, such that the part of the display panel corresponding to the second support member  2  is bent and folded by the second preset angle, and the second support member  2  drives the part of the display panel corresponding to the first support member  1  to be bent and folded relative to the third support member by the sum of the first preset angle and the second preset angle. In this case, the third support member  3  and the fourth support member  4  are fixed relative to each other, and the corresponding parts of the display panel (the part corresponding to the third support member  3  and the part corresponding to the fourth support member  4 ) are stably supported by the third support member  3  and the fourth support member  4 . 
     Subsequently, the second support member  2  is moved to the second unlocked position, and the third support member  3  rotates relative to the fourth support member  4  around the third rotation axis by a third preset angle which may be equal to the first preset angle, such that the part of the display panel corresponding to the third support member  3  is bent and folded by the third preset angle. Further, the third support member  3  is configured to drive the part of the display panel corresponding to the second support member  2  to be bent and folded relative to the fourth support member  4  by the third preset angle, such that the part of the display panel corresponding to the second support member  2  is bent and folded relative to the fourth support member  4  by the sum of the second preset angle and the third preset angle. Moreover, the third support member  3  is configured to drive the part of the display panel corresponding to the first support member  1  to be bent and folded by the third preset angle relative to the fourth support member  4 , such that the part of the display panel corresponding to the first support member  1  is bent and folded relative to the fourth support member  4  by the sum of the first preset angle, the second preset angle and the third preset angle. Finally, the folding of at least part of the foldable display screen is completed. 
     When the foldable display screen needs to be unfolded, first, the second support member  2  is in the second unlocked position, and the third support member  3  rotates relative to the fourth support member  4  around the third rotation axis by the third preset angle, such that the part of the display panel corresponding to the third support member  3  is unfolded. Further, the third support member  3  is configured to drive the part of the display panel corresponding to the second support member  2  to rotate relative to the fourth support member  4  by the third preset angle, and the third support member  3  is also configured to drive the part of the display panel corresponding to the first support member  1  to rotate relative to the fourth support member  4  by the third preset angle. 
     Then, the second support member  2  is moved to the second locked position, the first support member  1  is in the first unlocked position in this case, the third support member  3  and the fourth support member  4  are fixed relative to each other, and the corresponding parts of the display panel (the part corresponding to the third support member  3  and the part corresponding to the fourth support member  4 ) are stably supported by the third support member  3  and the fourth support member  4 , such that the part of the display panel corresponding to the second support member  2  is unfolded, and the part of the display panel corresponding to the first support member  1  rotates relative to the third support member  3  by the second preset angle. Subsequently, the first support member  1  is moved to the first locked position, the second support member  2  and the third support member  3  are fixed relative to each other in this case, the corresponding parts of the display panel (the part corresponding to the second support member  2  and the part corresponding to the third support member  3 ) are stably supported by the second support member  2  and the third support member  3 , and the part of the display panel corresponding to the first support member  1  are unfolded. Finally, the unfolding of at least part of the foldable display screen is completed. 
     The achievement of the bending, folding and unfolding processes of the support assembly  100  only needs to form a rotation pair between the third support member  3  and the fourth support member  4 , so as to achieve that the third support member  3  can rotate relative to the fourth support member  4 . Further, a stop structure is arranged among the first support member  1 , the second support member  2 , the third support member  3  and the fourth support member  4 , such that when the second support member  2  is in the second locked position, the third support member  3  and the fourth support member  4  are fixed relative to each other, and when the second support member  2  is in the second unlocked position, the third support member  3  can rotate relative to the fourth support member  4 . Compared to the related art, the size and weight of the support assembly are further reduced, such that the thickness and weight of the foldable display screen can be further reduced, and further, the thickness and weight of the terminal device with the foldable display screen can be reduced, which is conducive to the lightweight design of the terminal device with the foldable display screen. 
     In some embodiments, the first support member  1  includes a first support body  101  and a first fitting portion  102  arranged on the first support body  101 . The second support member  2  includes a second support body  201  and a second fitting portion  202  arranged on the second support body  201 . The second fitting portion  202  is rotatably arranged to the first fitting portion  102  such that the first support member  1  is rotatably arranged to the second support member  2 . 
     In order to more easily understand the technical solution of the present disclosure, the technical solution of the present disclosure is further described by taking an example below, in which a thickness direction of the first support member  1  is consistent with an up-down direction when the display panel is fully unfolded. The up-down direction is shown in  FIGS.  1  to  4   . 
     For example, as shown in  FIGS.  1  to  4   , the first fitting portion  102  is arranged on an upper surface of the first support body  101 , and the second fitting portion  202  is arranged on an upper surface of the second support body  201 . The display panel is arranged on lower sides of the first support body  101  and the second support body  201  such that a lower surface of the first support body  101  and a lower surface of the second support body  201  may be used to support corresponding parts of the display panel (a part corresponding to the first support body  101  and a part corresponding to the second support body  201 ). 
     Thus, when the foldable display screen needs to be bent and folded or unfolded, the first fitting portion  102  rotates relative to the second fitting portion  202  such that the first support member  1  rotates relative to the second support member  2 , which is not only convenient for the rotation of the first support member  1  relative to the second support member  2 , but also is conducive to simplifying the structures of the first support member  1  and the second support member  2 , thus further reducing the size and weight of the support assembly  100 , further reducing the thickness and weight of the foldable display screen, and further reducing the thickness and weight of the terminal device with the foldable display screen. 
     In some embodiments, the first fitting portion  102  overhangs an edge of the first support body  101  along a direction towards the second support body  201 . The second fitting portion  202  overhangs an edge of the second support body  201  along a direction towards the first support body  101 . 
     For example, as shown in  FIGS.  1  to  5   , the first fitting portion  102  overhangs a right edge of the first support body  101  rightwards, and the second fitting portion  202  overhangs a left edge of the second support body  201  leftwards. 
     Thus, the first fitting portion  102  and the second fitting portion  202  are close to each other and have overlapping parts with each other, which is convenient for the first fitting portion  102  to be fitted with the second fitting portion  202 , thus simplifying the structure of the support assembly  100  and facilitating the assembling of the support assembly  100 . 
     In some embodiments, one of the first fitting portion  102  and the second fitting portion  202  is a first sliding block, and the other one of the first fitting portion  102  and the second fitting portion  202  is a first sliding piece. The first sliding block is provided with a first sliding slot  2021  with an opening facing the first sliding piece, and a part of the first sliding piece is slidably arranged in the first sliding slot  2021  along an arrangement direction of the first support body  101  and the second support body  201  through the opening of the first sliding slot  2021 . 
     For example, as shown in  FIG.  2   , the first fitting portion  102  is the first sliding piece, the second fitting portion  202  is the first sliding block, and the first fitting portion  102  is located on a left side of the second fitting portion  202 . The second fitting portion  202  is provided with the first sliding slot  2021  having the opening facing leftwards, and a part of the first fitting portion  102  is slidably arranged in the first sliding slot  2021  along the left-right direction through the opening of the second fitting portion  202 . Of course, in some other embodiments, the first fitting portion may also be the first sliding block, the second fitting portion may be the first sliding piece, and the first fitting portion may be provided with the first sliding slot having the opening facing rightwards. 
     Thus, the first sliding piece is configured to slide relative to the first sliding slot  2021  along the arrangement direction of the first support body  101  and the second support body  201 , so as to achieve the rotation of the first support member  1  relative to the second support member  2 . The structures of the first fitting portion  102  and the second fitting portion  202  are simple, which is conducive to simplifying the structure of the support assembly  100  and facilitating the assembling of the support assembly  100 . 
     In some embodiments, the first sliding slot  2021  is a through slot. In other words, the first sliding slot  2021  is a through slot running through the first sliding block along a length direction of the second support body  201 . For example, as shown in  FIGS.  1  to  4   , the first sliding slot  2021  runs through the second fitting portion  202  in the front-rear direction. 
     In some embodiments, the first sliding piece is an arc sliding piece, and the first sliding piece is fitted with the first sliding slot  2021 . 
     For example, as shown in  FIGS.  1  to  4   , the first sliding piece is a circular-arc sliding piece, and a side wall of the first sliding slot  2021  has a circular-arc shape. The first sliding piece has a first upper surface and a first lower surface facing away from each other in the up-down direction, and the first sliding slot  2021  has a first upper side wall and a first lower side wall opposite to each other in the up-down direction. The first upper surface is fitted to the first upper side wall, and the first upper surface can slide relative to the first upper side wall in the left-right direction. The first lower surface is fitted to the first lower side wall, and the first lower surface can slide relative to the first lower side wall in the left-right direction. 
     Thus, on one hand, the sliding of the first sliding piece can be guided by the fit of the first sliding slot  2021  with the first sliding piece, which is conducive to improving the motion reliability between the first support member  1  and the second support member  2 , so as to improve the reliability of the support assembly  100 , and then improve the reliability of the foldable display screen with the support assembly  100  and the reliability of the terminal device with the foldable display screen. On the other hand, through the fit of the first sliding slot  2021  with the first sliding piece, the side walls of the first sliding slot  2021  can be used to limit a position of the first sliding piece in the up-down direction, and thus the first sliding piece is prevented from falling out of the first sliding slot  2021  in the up-down direction, so as to facilitate the assembling of the support assembly  100 . 
     In some embodiments, the second support member  2  includes a second support body  201  and a third fitting portion  203  arranged on the second support body  201 . The third support member  3  includes a third support body  301  and a fourth fitting portion  302  arranged on the third support body  301 . The fourth fitting portion  302  is rotatably arranged to the third fitting portion  203  such that the third support member  3  is rotatably arranged to the second support member  2 . 
     For example, as shown in  FIGS.  1  to  4   , the third fitting portion  203  is arranged on an upper surface of the second support body  201 , and the fourth fitting portion  302  is arranged on an upper surface of the third support body  301 . The display panel is arranged on lower sides of the second support body  201  and the third support body  301  such that a lower surface of the second support body  201  and a lower surface of the third support body  301  may be used to support corresponding parts of the display panel (a part corresponding to the second support body  201  and a part corresponding to the third support body  301 ). 
     Thus, when the foldable display screen needs to be bent and folded or unfolded, the third fitting portion  203  rotates relative to the fourth fitting portion  302  to achieve the rotation of the second support member  2  relative to the third support member  3 , which is not only convenient for the rotation of the second support member  2  relative to the third support member  3 , but also is conducive to simplifying the structures of the second support member  2  and the third support member  3 , thus further reducing the size and weight of the support assembly  100 , further reducing the thickness and weight of the foldable display screen, and further reducing the thickness and weight of the terminal device with the foldable display screen. 
     In some embodiments, the third fitting portion  203  overhangs an edge of the second support body  201  along a direction towards the third support body  301 . The fourth fitting portion  302  overhangs an edge of the third support body  301  along a direction towards the second support body  201 . 
     For example, as shown in  FIGS.  1  to  5   , the third fitting portion  203  overhangs a right edge of the second support body  201  rightwards, and the fourth fitting portion  302  overhangs a left edge of the third support body  301  leftwards. 
     Thus, the third fitting portion  203  and the fourth fitting portion  302  are close to each other and have overlapping parts with each other, which is convenient for the third fitting portion  203  to be fitted with the fourth fitting portion  302 , thus simplifying the structure of the support assembly  100  and facilitating the assembling of the support assembly  100 . 
     In some embodiments, one of the third fitting portion  203  and the fourth fitting portion  302  is a second sliding block, and the other one of the third fitting portion  203  and the fourth fitting portion  302  is a second sliding piece. The second sliding block is provided with a second sliding slot  3021  with an opening facing the second sliding piece, and a part of the second sliding piece is slidably arranged in the second sliding slot  3021  along an arrangement direction of the second support body  201  and the third support body  301  through the opening of the second sliding slot  3021 . 
     For example, as shown in  FIG.  2   , the third fitting portion  203  is the second sliding piece, the fourth fitting portion  302  is the second sliding block, and the third fitting portion  203  is located on a left side of the fourth fitting portion  302 . The fourth fitting portion  302  is provided with the second sliding slot  3021  having the opening facing leftwards, and a part of the third fitting portion  203  is slidably arranged in the second sliding slot  3021  along the left-right direction through the opening of the fourth fitting portion  302 . Of course, in some other embodiments, the third fitting portion may also be the second sliding block, the fourth fitting portion may be the second sliding piece, and the third fitting portion may be provided with the second sliding slot having the opening facing rightwards. 
     Thus, the second sliding piece is configured to slide relative to the second sliding slot  3021  along the arrangement direction of the third support body  301  and the second support body  201 , so as to achieve the rotation of the second support member  2  relative to the third support member  3 . The structures of the third fitting portion  203  and the fourth fitting portion  302  are simple, which is conducive to simplifying the structure of the support assembly  100  and facilitating the assembling of the support assembly  100 . 
     In some embodiments, the second sliding slot  3021  is a through slot. In other words, the second sliding slot  3021  is a through slot running through the second sliding block along a length direction of the third support body  301 . For example, as shown in  FIGS.  1  to  4   , the second sliding slot  3021  runs through the fourth fitting portion  302  in the front-rear direction. 
     In some embodiments, the second sliding piece is an arc sliding piece, and the second sliding piece is fitted with the second sliding slot  3021 . 
     For example, as shown in  FIGS.  1  to  4   , the second sliding piece is a circular-arc sliding piece, and a side wall of the second sliding slot  3021  has a circular-arc shape. The second sliding piece has a second upper surface and a second lower surface facing away from each other in the up-down direction, and the second sliding slot  3021  has a second upper side wall and a second lower side wall opposite to each other in the up-down direction. The second upper surface is fitted to the second upper side wall, and the second upper surface may slide relative to the second upper side wall in the left-right direction. The second lower surface is fitted to the second lower side wall, and the second lower surface may slide relative to the second lower side wall in the left-right direction. 
     Thus, on one hand, the sliding of the second sliding piece can be guided by the fit of the second sliding slot  3021  with the second sliding piece, which is conducive to improving the motion reliability between the second support member  2  and the third support member  3 , so as to improve the reliability of the support assembly  100 , and then improve the reliability of the foldable display screen with the support assembly  100  and the reliability of the terminal device with the foldable display screen. On the other hand, through the fit of the second sliding slot  3021  with the second sliding piece, the side walls of the second sliding slot  3021  can be used to limit a position of the second sliding piece in the up-down direction, and thus the second sliding piece is prevented from falling out of the second sliding slot  3021  in the up-down direction, so as to facilitate the assembling of the support assembly  100 . 
     In some embodiments, the third support member  3  includes a fifth fitting portion  303  arranged on the third support body  301 . The fourth support member  4  includes a fourth support body  401  and a sixth fitting portion  402  arranged on the fourth support body  401 . The sixth fitting portion  402  is rotatably arranged to the fifth fitting portion  303  such that the fourth support member  4  is rotatably arranged to the third support member  3 . 
     For example, as shown in  FIGS.  1  to  4   , the fifth fitting portion  303  is arranged on an upper surface of the third support body  301 , and the sixth fitting portion  402  is arranged on an upper surface of the fourth support body  401 . The display panel is arranged on lower sides of the third support body  301  and the fourth support body  401  such that a lower surface of the third support body  301  and a lower surface of the fourth support body  401  may be used to support corresponding parts of the display panel (the part corresponding to the third support body  301  and a part corresponding to the fourth support body  401 ). 
     Thus, when the foldable display screen needs to be bent and folded or unfolded, the fifth fitting portion  303  rotates relative to the sixth fitting portion  402  to achieve the rotation of the third support member  3  relative to the fourth support member  4 , which is not only convenient for the rotation of the third support member  3  relative to the fourth support member  4 , but also conducive to simplifying the structure of the third support member  3  and the fourth support member  4 , thus further reducing the size and weight of the support assembly  100 , further reducing the thickness and weight of the foldable display screen, and further reducing the thickness and weight of the terminal device with the foldable display screen. 
     In some embodiments, the fifth fitting portion  303  overhangs an edge of the third support body  301  along a direction towards the fourth support body  401 . The sixth fitting portion  402  overhangs an edge of the fourth support body  401  along a direction towards the third support body  301 . 
     For example, as shown in  FIGS.  1  to  5   , the fifth fitting portion  303  overhangs a right edge of the third support body  301  rightwards, and the sixth fitting portion  402  overhangs a left edge of the fourth support body  401  leftwards. 
     Thus, the fifth fitting portion  303  and the sixth fitting portion  402  are close to each other and have overlapping parts with each other, which is convenient for the fifth fitting portion  303  to be fitted with the sixth fitting portion  402 , thus simplifying the structure of the support assembly  100  and facilitating the assembling of the support assembly  100 . 
     In some embodiments, one of the fifth fitting portion  303  and the sixth fitting portion  402  is a third sliding block, and the other one of the fifth fitting portion  303  and the sixth fitting portion  402  is a third sliding piece. The third sliding block is provided with a third sliding slot  4021  with an opening facing the third sliding piece, and a part of the third sliding piece is slidably arranged in the third sliding slot  4021  along an arrangement direction of the third support body  301  and the fourth support body  401  through the opening of the third sliding slot  4021 . 
     For example, as shown in  FIG.  2   , the fifth fitting portion  303  is the third sliding piece, the sixth fitting portion  402  is the third sliding block, and the fifth fitting portion  303  is located on a left side of the sixth fitting portion  402 . The sixth fitting portion  402  is provided with the third sliding slot  4021  having the opening facing leftwards, and a part of the fifth fitting portion  303  is slidably arranged in the third sliding slot  4021  along the left-right direction through the opening of the sixth fitting portion  402 . Of course, in some other embodiments, the fifth fitting portion may also be the third sliding block, the sixth fitting portion may be the third sliding piece, and the fifth fitting portion may be provided with the third sliding slot having the opening facing rightwards. 
     Thus, the third sliding piece is configured to slide relative to the third sliding slot  4021  along the arrangement direction of the third support body  301  and the fourth support body  401 , so as to achieve the rotation of the third support member  3  relative to the fourth support member  4 . The structures of the fifth fitting portion  303  and the sixth fitting portion  402  are simple, which is conducive to simplifying the structure of the support assembly  100  and facilitating the assembling of the support assembly  100 . 
     In some embodiments, the third sliding slot  4021  is a through slot. In other words, the third sliding slot  4021  is a through slot running through the third sliding block along a length direction of the fourth support body  401 . For example, as shown in  FIGS.  1  to  4   , the third sliding slot  4021  runs through the sixth fitting portion  402  in the front-rear direction. 
     In some embodiments, the third sliding piece is an arc sliding piece, and the third sliding piece is fitted with the third sliding slot  4021 . 
     For example, as shown in  FIGS.  1  to  4   , the third sliding piece is a circular-arc sliding piece, and a side wall of the third sliding slot  4021  has a circular-arc shape. The third sliding piece has a third upper surface and a third lower surface facing away from each other in the up-down direction, and the third sliding slot  4021  has a third upper side wall and a third lower side wall opposite to each other in the up-down direction. The third upper surface is fitted to the third upper side wall, and the third upper surface may slide relative to the third upper side wall in the left-right direction. The third lower surface is fitted to the third lower side wall, and the third lower surface may slide relative to the third lower side wall in the left-right direction. 
     Thus, on one hand, the sliding of the third sliding piece can be guided by the fit of the third sliding slot  4021  with the third sliding piece, which is conducive to improving the motion reliability between the third support member  3  and the fourth support member  4 , so as to improve the reliability of the support assembly  100 , and then improve the reliability of the foldable display screen with the support assembly  100  and the reliability of the terminal device with the foldable display screen. On the other hand, through the fit of the third sliding slot  4021  with the third sliding piece, the side walls of the third sliding slot  4021  can be used to limit a position of the third sliding piece in the up-down direction, and thus the third sliding piece is prevented from falling out of the third sliding slot  4021  in the up-down direction, so as to facilitate the assembling of the support assembly  100 . 
     Of course, in some other embodiments, other structures may also be arranged on the first support member and the second support member such that the first support member can rotate relative to the second support member. For example, a hinge is arranged between the first support member and the second support member such that the first support member can rotate relative to the second support member. Other structures may also be arranged on the second support member and the third support member such that the second support member can rotate relative to the third support member. For example, a hinge is arranged between the second support member and the third support member such that the second support member can rotate relative to the third support member. Other structures may also be arranged on the third support member and the fourth support member such that the third support member can rotate relative to the fourth support member. For example, a hinge is arranged between the third support member and the fourth support member such that the third support member can rotate relative to the fourth support member. 
     In some embodiments, the first support member  1  includes a first stop portion  103  arranged on the first support body  101 , and the third support member  3  includes a second stop portion  304  arranged on the third support body  301 . When the first support member  1  is in the first locked position, the first stop portion  103  and the second support member  2  are spaced apart from each other such that the first support member  1  can rotate relative to the second support member  2 , and one of the first stop portion  103  and the second stop portion  304  is configured to abut against the other one of the first stop portion  103  and the second stop portion  304 , such that the second support member  2  and the third support member  3  are fixed relative to each other. When the first support member  1  is in the first unlocked position, the second stop portion  304  disengages from the first stop portion  103  such that the second support member  2  may rotate relative to the third support member  3 . 
     One of the first stop portion  103  and the second stop portion  304  being configured to abut against the other one of the first stop portion  103  and the second stop portion  304 , may be understood as follows: when the first support member  1  is in the first locked position, if the second support member  2  rotates relative to the third support member  3 , one of the first stop portion  103  and the second stop portion  304  abuts against the other one of the first stop portion  103  and the second stop portion  304 , so as to prevent the second support member  2  from rotating relative to the third support member  3 , and if the second support member  2  does not rotate relative to the third support member  3 , one of the first stop portion  103  and the second stop portion  304  does not abut against the other one of the first stop portion  103  and the second stop portion  304 . 
     For example, as shown in  FIGS.  1  to  4   , the first stop portion  103  is arranged on the upper surface of the first support body  101 , and the second stop portion  304  is arranged on the upper surface of the second support body  201 . When the first support member  1  is in the first locked position, the first stop portion  103  and the second support member  2  are spaced apart from each other in the up-down direction to prevent the first stop portion  103  from blocking the rotation of the first support member  1  relative to the second support member  2 . Moreover, when the first support member  1  is in the first locked position, the second stop portion  304  is configured to abut against the first stop portion  103  to prevent the second support member  2  from rotating relative to the third support member  3 . When the first support member  1  is in the first unlocked position, the second stop portion  304  and the first stop portion  103  are staggered in the left-right direction, such that the second stop portion  304  disengages from the first stop portion  103 , and the second support member  2  may rotate relative to the third support member  3  in this case. 
     When the foldable display screen needs to be bent and folded, and the first support member  1  is in the first locked position, one of the first stop portion  103  and the second stop portion  304  is configured to abut against the other one of the first stop portion  103  and the second stop portion  304  so as to prevent the second support member  2  from rotating relative to the third support member  3 , such that the second support member  2  and the third support member  3  are fixed relative to each other. When the foldable display screen needs to be bent and folded, and the first support member  1  is in the first unlocked position, the second stop portion  304  is configured to disengage from the first stop portion  103 , such that the second support member  2  can rotate relative to the third support member  3 . 
     Thus, the first stop portion  103  and the second stop portion  304  form a stop structure among the first support member  1 , the second support member  2  and the third support member  3 . The stop structure is simple, which is conducive to further reducing the size and weight of the support assembly  100 . Thus, the thickness and weight of the foldable display screen can be further reduced, and the thickness and weight of the terminal device with the foldable display screen can be further reduced. 
     In some embodiments, when the first support member  1  is in the first unlocked position, the first stop portion  103  abuts against the second support body  201  such that the second support member  2  and the first support member  1  are fixed relative to each other. 
     For example, when the first support member  1  is in the first unlocked position, a right edge of the first stop portion  103  abuts against the second support body  201 . In this case, under a blocking action of the first stop portion  103 , the first support member  1  cannot rotate relative to the second support member  2 , such that the first support member  1  and the second support member  2  are fixed relative to each other. In this way, the first support member  1  and the second support member  2  may rotate as a whole relative to the third support member  3 . In addition, the corresponding parts of the display panel (the part corresponding to the first support member  1  and the part corresponding to the second support member  2 ) can be stably supported by the first support member  1  and the second support member  2 , which is beneficial to further improving the reliability of the support assembly  100 . 
     In some embodiments, the first stop portion  103  overhangs the edge of the first support body  101  along a direction towards the third support body  301 , and the second stop portion  304  overhangs an edge of the third support body  301  along a direction towards the first support body  101 . 
     For example, as shown in  FIGS.  1  to  5   , the first stop portion  103  overhangs the right edge of the first support body  101  rightwards, and the second stop portion  304  overhangs the left edge of the third support body  301  leftwards. 
     Thus, the first stop portion  103  and the second stop portion  304  are close to each other, and even have overlapping parts with each other, which is convenient for the first stop portion  103  to be fitted with the second stop portion  304 , thus simplifying the structure of the support assembly  100  and facilitating the assembling of the support assembly  100 . 
     In some embodiments, one of the first stop portion  103  and the second stop portion  304  is a first stop piece, the first stop piece is provided with a first relief notch  1031 , and the other one of the first stop portion  103  and the second stop portion  304  is a first stop block. When the first support member  1  is in the first locked position, the first stop block can abut against the first stop piece. When the first support member  1  is in the first unlocked position, the first stop block is located in the first relief notch  1031 , such that the second stop portion  304  disengages from the first stop portion  103 . 
     For example, as shown in  FIG.  2   , the first stop portion  103  is the first stop piece, the second stop portion  304  is the first stop block, and the first stop portion  103  is located on a left side of the second stop portion  304 . The first stop piece is provided with the first relief notch  1031 . Of course, in some other embodiments, the first stop portion may also be the first stop block, the second stop portion is the first stop piece, and the first stop piece is provided with the first relief notch. 
     Thus, when the first support member  1  is in the first locked position, the first stop block abuts against the first stop piece, such that the second support member  2  and the third support member  3  are fixed relative to each other. When the first support member  1  is in the first unlocked position, the first stop block is located in the first relief notch  1031 , such that the second stop portion  304  disengages from the first stop portion  103 , and the second support member  2  can rotate relative to the third support member  3 . The structures of the first stop portion  103  and the second stop portion  304  are simple, which is conducive to simplifying the structure of the support assembly  100  and facilitating the assembling of the support assembly  100 . 
     In some embodiments, the second support member  2  includes a third stop portion  204  arranged on the second support body  201 , and the fourth support member  4  includes a fourth stop portion  403  arranged on the fourth support body  401 . When the second support member  2  is in the second locked position, the third stop portion  204  and the third support member  3  are spaced apart from each other such that the second support member  2  can rotate relative to the third support member  3 , and one of the third stop portion  204  and the fourth stop portion  403  is configured to abut against the other one of the third stop portion  204  and the fourth stop portion  403  such that the third support member  3  and the fourth support member  4  are fixed relative to each other. When the second support member  2  is in the second unlocked position, the fourth stop portion  403  disengages from the third stop portion  204  such that the third support member  3  can rotate relative to the fourth support member  4 . 
     When the foldable display screen needs to be bent and folded, and the second support member  2  is in the second locked position, one of the third stop portion  204  and the fourth stop portion  403  is configured to abut against the other one of the third stop portion  204  and the fourth stop portion  403  to prevent the third support member  3  from rotating relative to the fourth support member  4 , such that the third support member  3  and the fourth support member  4  are fixed relative to each other. When the foldable display screen needs to be bent and folded, and the second support member  2  is in the second unlocked position, the fourth stop portion  403  is configured to disengage from the third stop portion  204 , such that the third support member  3  can rotate relative to the fourth support member  4 . 
     Thus, the third stop portion  204  and the fourth stop portion  403  form a stop structure among the second support member  2 , the third support member  3  and the fourth support member  4 . The stop structure is simple, which is conducive to further reducing the size and weight of the support assembly  100 . Thus, the thickness and weight of the foldable display screen can be further reduced, and the thickness and weight of the terminal device with the foldable display screen can be further reduced. 
     Of course, in some other embodiments, a stop structure may also be arranged between the second support member and the third support member, such that when the first support member is in the first locked position, the second support member and the third support member are fixed relative to each other, and when the first support member is in the first unlocked position, the second support member can rotate relative to the third support. A stop structure may also be arranged between the third support member and the fourth support member, such that when the second support member is in the second locked position, the third support member and the fourth support member are fixed relative to each other, and when the second support member is in the second unlocked position, the third support member can rotate relative to the fourth support member. 
     In some embodiments, when the second support member  2  is in the second unlocked position, the third stop portion  204  abuts against the third support member  3  such that the second support member  2  and the third support member  3  are fixed relative to each other. 
     For example, when the second support member  2  is in the second unlocked position, a right edge of the third stop portion  204  abuts against the third support body  301 . In this case, under a blocking action of the third stop portion  204 , the second support member  2  cannot rotate relative to the third support member  3 , such that the second support member  2  and the third support member  3  are fixed relative to each other. In this case, the second support member  2  and the third support member  3  may rotate as a whole relative to the fourth support member  4 . In addition, the corresponding parts of the display panel (the part corresponding to the second support member  2  and the part corresponding to the third support member  3 ) can be stably supported by the second support member  2  and the third support member  3 , which is beneficial to further improving the reliability of the support assembly  100 . 
     In some embodiments, the third stop portion  204  overhangs the edge of the second support body  201  along a direction towards the fourth support body  401 , and the fourth stop portion  403  overhangs the edge of the fourth support body  401  along a direction towards the second support body  201 . 
     For example, as shown in  FIGS.  1  to  5   , the third stop portion  204  overhangs the right edge of the second support body  201  rightwards, and the fourth stop portion  403  overhangs the left edge of the fourth support body  401  leftwards. 
     Thus, the third stop portion  204  and the fourth stop portion  403  are close to each other, and even have overlapping parts with each other, which is convenient for the third stop portion  204  to be fitted with the fourth stop portion  403 , thus simplifying the structure of the support assembly  100  and facilitating the assembling of the support assembly  100 . 
     In some embodiments, one of the third stop portion  204  and the fourth stop portion  403  is a second stop piece, the second stop piece is provided with a second relief notch  2041 , and the other one of the third stop portion  204  and the fourth stop portion  403  is a second stop block. When the second support member  2  is in the second locked position, the second stop block can abut against the second stop piece. When the second support member  2  is in the second unlocked position, the second stop block is located in the second relief notch  2041 , such that the fourth stop portion  403  disengages from the third stop portion  204 . 
     For example, as shown in  FIG.  2   , the third stop portion  204  is the second stop piece, the fourth stop portion  403  is the second stop block, and the third stop portion  204  is located on a left side of the fourth stop portion  403 . The second stop piece is provided with the second relief notch  2041 . Of course, in some other embodiments, the third stop portion may also be the second stop block, the fourth stop portion is the second stop piece, and the second stop piece is provided with the second relief notch. 
     Thus, when the second support member  2  is in the second locked position, the second stop block abuts against the second stop piece, such that the third support member  3  and the fourth support member  4  are fixed relative to each other. When the second support member  2  is in the second unlocked position, the second stop block is located in the second relief notch  2041 , such that the fourth stop portion  403  disengages from the third stop portion  204 , and the third support member  3  can rotate relative to the fourth support member  4 . The structures of the third stop portion  204  and the fourth stop portion  403  are simple, which is conducive to simplifying the structure of the support assembly  100  and facilitating the assembling of the support assembly  100 . 
     In some embodiments, the third fitting portion  203  is the second sliding piece, the third stop portion  204  is the second stop piece, and the second sliding piece is provided with the second stop piece. The second sliding piece includes a fitting section  2031  and a stop section  2032  connected with each other. A part of the fitting section  2031  is slidably arranged in the second sliding slot  3021  along the arrangement direction of the second support body  201  and the third support body  301 , and the second relief notch  2041  is formed in the stop section  2032 . When the second support member  2  is in the second locked position, the second stop block can abut against the stop section  2032 . 
     For example, as shown in  FIGS.  1  to  4   , the third fitting portion  203  and the third stop portion  204  are the same component, that is, the second stop piece and the second sliding piece are the same component. The second sliding piece includes the fitting section  2031  and the stop section  2032  arranged in the front-rear direction, and the fitting section  2031  is arranged at a rear side of the stop section  2032 . When the second support member  2  is in the second locked position, the second stop block can abut against a front part (the stop section  2032 ) of the second sliding piece. When the second support member  2  is in the second unlocked position, the second stop block is located in the second relief notch  2041  of the stop section  2032 . 
     Thus, the third fitting portion  203  and the third stop portion  204  are the same component, thereby further simplifying the structures of the first support member  1  and the third support member  3 , which is not only convenient for the processing and assembling of the support assembly  100 , but also is conducive to further reducing the size and weight of the support assembly  100 . Thus, the thickness and weight of the foldable display screen can be further reduced, and the thickness and weight of the terminal device with the foldable display screen can be further reduced. 
     In some embodiments, the first support body  101 , the second support body  201  and the third support body  301  are arranged along a width direction of the first support body  101 . The first fitting portion  102  and the first stop portion  103  are spaced apart from each other along a length direction of the first support body  101 . The third fitting portion  203  is located between the second fitting portion  202  and the first stop portion  103  in the length direction of the first support body  101 . In other words, the third fitting portion  203  is located between the first fitting portion  102  and the first stop portion  103  in the length direction of the first support body  101 . 
     For example, as shown in  FIGS.  1  to  5   , the width direction of the first support body  101  is consistent with the left-right direction, and the length direction of the first support body  101  is consistent with the front-rear direction. The first support body  101 , the second support body  201  and the third support body  301  are arranged in the left-right direction. The second fitting portion  202  and the first stop portion  103  are spaced apart from each other along the front-rear direction, and the third fitting portion  203  is located between the second fitting portion  202  and the first stop portion  103  in the front-rear direction. 
     Thus, the structures of the second fitting portion  202  (the first fitting portion  102 ), the first stop portion  103  and the third fitting portion  203  (the third stop portion  204 ) are more compact, which is conducive to further reducing the size and weight of the support assembly  100 , thus further reducing the thickness and weight of the foldable display screen, and further reducing the thickness and weight of the terminal device with the foldable display screen. 
     In some embodiments, the third support body  301  and the fourth support body  401  are arranged along the width direction of the first support body  101 . The sixth fitting portion  402  and the first stop portion  103  are spaced apart from each other along the length direction of the first support body  101 , and the third fitting portion  203  is located between the sixth fitting portion  402  and the first stop portion  103  in the length direction of the first support body  101 . 
     For example, as shown in  FIGS.  1  to  5   , the third support body  301  and the fourth support body  401  are arranged in the left-right direction. The sixth fitting portion  402  and the first stop portion  103  are spaced apart from each other along the front-rear direction, and the third fitting portion  203  is located between the sixth fitting portion  402  and the first stop portion  103  in the front-rear direction. 
     Thus, the structures of the sixth fitting portion  402  (the fifth fitting portion  303 ), the first stop portion  103  and the third fitting portion  203  (the third stop portion  204 ) are more compact, which is conducive to further reducing the size and weight of the support assembly  100 , thus further reducing the thickness and weight of the foldable display screen, and further reducing the thickness and weight of the terminal device with the foldable display screen. 
     In some embodiments, the second stop portion  304  is arranged on the fourth fitting portion  302 . 
     For example, as shown in  FIGS.  1  to  4   , the second stop portion  304  is arranged to a left edge of the fourth fitting portion  302 . 
     Thus, the structure of the third support member  3  is more compact, which is conducive to further reducing the size and weight of the support assembly  100 , thereby further reducing the thickness and weight of the foldable display screen, and further reducing the thickness and weight of the terminal device with the foldable display screen. 
     In some embodiments, the second stop portion  304  and the fourth fitting portion  302  are integrally formed. 
     The second stop portion  304  and the fourth fitting portion  302  are integrally formed to facilitate the processing of the third support member  3 , thereby facilitating the processing of the support assembly  100 . 
     In some embodiments, the fourth stop portion  403  is arranged on the sixth fitting portion  402 . 
     For example, as shown in  FIGS.  1  to  4   , the fourth stop portion  403  is arranged to a left edge of the sixth fitting portion  402 . 
     Thus, the structure of the fourth support member  4  is more compact, which is conducive to further reducing the size and weight of the support assembly  100 , thereby further reducing the thickness and weight of the foldable display screen, and further reducing the thickness and weight of the terminal device with the foldable display screen. 
     In some embodiments, the fourth stop portion  403  and the sixth fitting portion  402  are integrally formed. 
     The fourth stop portion  403  and the sixth fitting portion  402  are integrally formed to facilitate the processing of the fourth support member  4 , thereby facilitating the processing of the support assembly  100 . 
     In some embodiments, the second stop portion  304  overhangs an edge of the fourth fitting portion  302  along the length direction of the first support body  101 . 
     For example, as shown in  FIGS.  1  to  4   , the second stop portion  304  overhangs the edge of the fourth fitting portion  302  rearwards. 
     Thus, the second stop portion  304  and the first stop portion  103  are close to each other, and have overlapping parts with each other, which is convenient for the second stop portion  304  to be fitted with the first stop portion  103 , thus simplifying the structure of the support assembly  100  and facilitating the assembling of the support assembly  100 . 
     In some embodiments, the fourth stop portion  403  overhangs an edge of the sixth fitting portion  402  along the length direction of the first support body  101 . 
     For example, as shown in  FIGS.  1  to  4   , the fourth stop portion  403  overhangs the edge of the sixth fitting portion  402  backwards. 
     Thus, the fourth stop portion  403  and the third stop portion  204  are close to each other, and have overlapping parts with each other, which is convenient for the fourth stop portion  403  to be fitted with the third stop portion  204 , thus simplifying the structure of the support assembly  100  and facilitating the assembling of the support assembly  100 . 
     In some embodiments, the structures of the first support member  1  and the third support member  3  are identical, and the structures of the second support member  2  and the fourth support member  4  are identical. 
     For example, the first support member  1  and the third support member  3  each are a first kind of support member, and the second support member  2  and the fourth support member  4  each are a second kind of support member. 
     The support assembly  100  mainly includes the first kind of support member and the second kind of support member, and the two kinds of support members are alternated and spaced apart from each other sequentially, thus simplifying the structure of the support assembly  100  and facilitating the assembling of the support assembly  100 . 
     It may be understood by those skilled in the art that the above first kind of support member and the above second kind of support member have the fitting relationship not only with the support members located at their upper two stages (a left side in  FIG.  1   ), but also with the support members located at their lower two stages (a right side in  FIG.  1   ). Thus, the first kind of support member and the second kind of support member need to be provided with not only components fitted with the support members located at their upper two stages (the left side in  FIG.  1   ), but also components fitted with the support members located at their lower two stages. The support member located at the first stage (not shown) merely needs to be fitted with the support members located at its lower two stages. Thus, the structure of the support member located at the first stage is different from that of the first kind of support member and that of the second kind of support member. The support member located at the second stage merely needs to be fitted with the support member located at its upper one stage and the support members located at its lower two stages. Thus, the structure of the support member located at the second stage is different from that of the first kind of support member and that of the second kind of support member. The support member located at the penultimate stage merely needs to be fitted with the support members located at its upper two stages and the support member located at its lower one stage. Thus, the structure of the support member located at the penultimate stage is different from that of the first kind of support member and that of the second kind of support member. The support member located at the last stage (not shown) merely needs to be fitted with the support members located at its upper two stages. Thus, the structure of the support member located at the last stage is different from that of the first kind of support member and that of the second kind of support member. 
     By taking the support assembly  100  shown in  FIGS.  1  to  5    as an example, the support assembly  100  of an embodiment of the present disclosure is described in detail below. 
     As shown in  FIGS.  1  to  5   , the support assembly  100  includes a first support member  1 , a second support member  2 , a third support member  3 , a fourth support member  4 , a fifth support member  5 , a sixth support member  6  and a seventh support member  7 . The first support member  1 , the second support member  2 , the third support member  3 , the fourth support member  4 , the fifth support member  5 , the sixth support member  6  and the seventh support member  7  are sequentially arranged along a left-right direction. The structures of the first support member  1 , the third support member  3 , the fifth support member  5  and the seventh support member  7  are identical, and the structures of the second support member  2 , the fourth support member  4  and the sixth support member  6  are identical. 
     The first support member  1  includes a first support body  101  as well as a first fitting portion  102  and a first stop portion  103  arranged on the first support body  101 . The first stop portion  103  is provided with a first relief notch  1031 . 
     The second support member  2  includes a second support body  201  as well as a second fitting portion  202 , a third fitting portion  203  and a third stop portion  204  arranged on the second support body  201 . The second fitting portion  202  is provided with a second sliding slot  3021 , the third fitting portion  203  and the third stop portion  204  are the same component, and the third stop portion  204  is provided with a second relief notch  2041 . 
     The third support member  3  includes a third support body  301  as well as a fourth fitting portion  302 , a fifth fitting portion  303 , a second stop portion  304  and a fifth stop portion  305  arranged on the third support body  301 . The fourth fitting portion  302  is provided with a second sliding slot  3021 , the second stop portion  304  is arranged on the fourth fitting portion  302 , and the fifth stop portion  305  is provided with a third relief notch  3051 . 
     The fourth support member  4  includes a fourth support body  401  as well as a sixth fitting portion  402 , a fourth stop portion  403 , a seventh fitting portion  404  and a seventh stop portion  405  arranged on the fourth support body  401 . The sixth fitting portion  402  is provided with a third sliding slot  4021 , the fourth stop portion  403  is arranged on the sixth fitting portion  402 , and the seventh stop portion  405  is provided with a fourth relief notch  4051 . 
     The fifth support member  5  includes a fifth support body  501  as well as an eighth fitting portion  502 , a ninth fitting portion  503 , a sixth stop portion  504  and a ninth stop portion  505  arranged on the fifth support body  501 . The eighth fitting portion  502  is provided with a fourth sliding slot, the sixth stop portion  504  is arranged on the eighth fitting portion  502 , and the ninth stop portion  505  is provided with a fifth relief notch  5051 . The eighth fitting portion  502  is rotatably arranged to the seventh fitting portion  404  such that the fifth support member  5  is rotatably arranged to the fourth support member  4 . 
     The sixth support member  6  includes a sixth support body  601  as well as a tenth fitting portion  602 , an eleventh fitting portion  603  and an eighth stop portion  604  arranged on the sixth support body  601 . The eighth stop portion  604  is arranged on the tenth fitting portion  602 . The tenth fitting portion  602  is rotatably arranged to the ninth fitting portion  503  such that the sixth support member  6  is rotatably arranged to the fifth support member  5 . 
     The seventh support member  7  includes a seventh support body  701  as well as a twelfth fitting portion  702  and a tenth stop portion  704  arranged on the seventh support body  701 , and the tenth stop portion  704  is arranged on the twelfth fitting portion  702 . The twelfth fitting portion  702  is rotatably arranged to the eleventh fitting portion  603  such that the seventh support member  7  is rotatably arranged to the sixth support member  6 . 
     The third support member  3  is movable between a third locked position and a third unlocked position. When the third support member  3  is in the third locked position, the third support member  3  can rotate relative to the fourth support member  4 , and the fourth support member  4  and the fifth support member  5  are fixed relative to each other. When the third support member  3  is in the third unlocked position, the fourth support member  4  can rotate relative to the fifth support member  5 . 
     The fourth support member  4  is movable between a fourth locked position and a fourth unlocked position. When the fourth support member  4  is in the fourth locked position, the fourth support member  4  can rotate relative to the fifth support member  5 , and the fifth support member  5  and the sixth support member  6  are fixed relative to each other. When the fourth support member  4  is in the fourth unlocked position, the fifth support member  5  can rotate relative to the sixth support member  6 . 
     The fifth support member  5  is movable between a fifth locked position and a fifth unlocked position. When the fifth support member  5  is in the fifth locked position, the fifth support member  5  can rotate relative to the sixth support member  6 , and the sixth support member  6  and the seventh support member  7  are fixed relative to each other. When the fifth support member  5  is in the fifth unlocked position, the sixth support member  6  can rotate relative to the seventh support member  7 . 
     When the foldable display screen is in an initial state (a state shown in  FIG.  1   ) and the foldable display screen needs to be bent and folded, first, the first support member  1  is in a first locked position, and the second stop portion  304  can abut against the first stop portion  103 , such that the second support member  2  and the third support member  3  are fixed relative to each other, and the first support member  1  rotates forwards by a first preset angle relative to the second support member  2 . Then, the first support member  1  is moved to a first unlocked position (in this case, the second support member  2  is in a second locked position, as shown in  FIG.  3   ), and the fourth stop portion  403  can abut against the third stop portion  204 , such that the second support member  2  and the third support member  3  are fixed relative to each other. Moreover, the second stop portion  304  is located in the first relief notch  1031 , the first stop portion  103  abuts against the second support body  201 , and the first support member  1  and the second support member  2  rotate forwards by a second preset angle as a whole around the third support member  3 . 
     Subsequently, the second support member  2  is moved to a second unlocked position (in this case, the third support member  3  is in a third locked position, as shown in  FIG.  4   ), and the sixth stop portion  504  can abut against the fifth stop portion  305 , such that the third support member  3  and the fourth support member  4  are fixed relative to each other. Moreover, the fourth stop portion  403  is located in the second relief notch  2041 , the third stop portion  204  abuts against the third support body  301 , and the first support member  1 , the second support member  2  and the third support member  3  rotate forwards by a third preset angle as a whole around the fourth support member  4 . 
     Subsequently, the third support member  3  is moved to the third unlocked position (in this case, the fourth support member  4  is in the fourth locked position), and the eighth stop portion  604  can abut against the seventh stop portion  405 , such that the fourth support member  4  and the fifth support member  5  are fixed relative to each other. Moreover, the sixth stop portion  504  is located in the third relief notch  3051 , the fifth stop portion  305  abuts against the fourth support body  401 , and the first support member  1 , the second support member  2 , the third support member  3  and the fourth support member  4  rotate forwards by a fourth preset angle as a whole around the fifth support member  5 . 
     Subsequently, the fourth support member  4  is moved to the fourth unlocked position (in this case, the fifth support member  5  is in the fifth locked position), and the tenth stop portion  704  can abut against the ninth stop portion  505 , such that the fifth support member  5  and the sixth support member  6  are fixed relative to each other. Moreover, the eighth stop portion  604  is located in the fourth relief notch  4051 , the seventh stop portion  405  abuts against the fifth support body  501 , and the first support member  1 , the second support member  2 , the third support member  3 , the fourth support member  4  and the fifth support member  5  rotate forwards by a fifth preset angle as a whole around the sixth support member  6 . 
     Subsequently, the fifth support member  5  is moved to the fifth unlocked position. As shown in  FIG.  5   , the tenth stop portion  704  is located in the fifth relief notch  5051 , the ninth stop portion  505  abuts against the sixth support body  601 , and the first support member  1 , the second support member  2 , the third support member  3 , the fourth support member  4 , the fifth support member  5  and the sixth support member  6  rotate forwards by a sixth preset angle as a whole around the seventh support member  7 . Finally, the folding of at least part of the foldable display screen is completed. 
     Accordingly, when the foldable display screen is in a final state (state shown in  FIG.  5   ) and the foldable display screen needs to be unfolded, first, the first support member  1 , the second support member  2 , the third support member  3 , the fourth support member  4 , the fifth support member  5  and the sixth support member  6  rotate reversely by the sixth preset angle as a whole around the seventh support member  7 , and the tenth stop portion  704  is pulled out of the fifth relief notch  5051 . Then, the first support member  1 , the second support member  2 , the third support member  3 , the fourth support member  4  and the fifth support member  5  rotate reversely by the fifth preset angle as a whole around the sixth support member  6 , and the eighth stop portion  604  is pulled out of the fourth relief notch  4051 . 
     Subsequently, the first support member  1 , the second support member  2 , the third support member  3  and the fourth support member  4  rotate reversely by the fourth preset angle as a whole around the fifth support member  5 . The sixth stop portion  504  is pulled out of the third relief notch  3051 . The first support member  1 , the second support member  2  and the third support member  3  rotate reversely by the third preset angle as a whole around the fourth support member  4 , and the fourth stop portion  403  is pulled out of the second relief notch  2041 . 
     Then, the first support member  1  and the second support member  2  rotate reversely by the second preset angle as a whole around the third support member  3 , and the second stop portion  304  is pulled out of the first relief notch  1031 . The first support member  1  rotates reversely by the first preset angle relative to the second support member  2 . Finally, the unfolding of the foldable display screen is completed. 
     The support assembly  100  of the embodiments of the present disclosure has characteristics of a simple structure, performance reliability and the like with low manufacturing difficulty. Further, its unique interlocking structure solves the complex form of multi-plate linkage, and has great advantages in manufacturing difficulty and space, which can meet the folding requirements of non-standard foldable screens, so as to be well adapted to various models. 
     The terminal device of the embodiments of the present disclosure includes a display panel and a support assembly, at least a part of the display panel is arranged on the support assembly, and the support assembly is the support assembly  100  described in any one of the above embodiments. 
     Thus, the terminal device of the embodiments of the present disclosure has the advantages of a thin thickness, a light weight and the like. 
     In the descriptions of the embodiments of the present disclosure, it is to be understood that, terms such as “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial” and “circumferential” should be construed to refer to the orientation or position as shown in the accompanying drawings. These relative terms are merely for convenience of descriptions and do not indicate or imply that the device or element referred to should have a particular orientation, or should be constructed or operated in a particular orientation, and thus cannot be construed as a limit to the present disclosure. 
     In addition, terms such as “first” and “second” are used herein for purposes of description and are not intended to indicate or imply relative importance or significance or to imply the number of indicated technical features. Thus, the feature defined by “first” and “second” may comprise one or more of this feature. In the description of the present invention, “a plurality of” means two or more than two, unless specified otherwise. 
     In the present disclosure, it should be noted that, unless specified otherwise, terms “mounted”, “coupled”, “connected” and “fixed” should be understood broadly, for example, may be fixed connections, detachable connections, or integral connections; may also be mechanical or electrical connections or intercommunications; may also be direct connections or indirect connections via intervening structures; may also be inner communications or interactions of two elements, which may be understood by those skilled in the related art according to specific situations. 
     In the descriptions of the present disclosure, it should be noted that, unless otherwise expressly specified and limited, the first feature “on” or “under” the second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature “over”, “above” and “on” the second feature may be that the first feature is directly above or obliquely above the second feature, or merely be that the first feature has a level higher than the second feature. The first feature “beneath”, “below” and “under” the second feature may be that the first feature is directly below or obliquely below the second feature, or merely be that the first feature has a level less than the second feature. 
     Reference throughout this specification to terms “an embodiment”, “some embodiments”, “an example”, “a specific example” or “some examples” means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, exemplary descriptions of aforesaid terms are not necessarily referring to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, in the case of non-contradiction, those skilled in the art may combine and group the different embodiments or examples described in this specification and the features of the different embodiments or examples. 
     Although explanatory embodiments have been illustrated and described, it would be appreciated by those skilled in the art that the above embodiments are exemplary and cannot be construed to limit the present disclosure, and changes, modifications, alternatives and varieties can be made in the embodiments by those skilled in the art without departing from scope of the present disclosure.