Patent Publication Number: US-2023156105-A1

Title: Display device

Description:
TECHNICAL FIELD 
     The present disclosure relates to a display technology field, and more particularly to a display device. 
     BACKGROUND 
     With the development of technology, appearances of mobile electronic devices have been changed greatly. Flexible screens are highly concerned due to their unique characteristics and great potential. Compared to the traditional screens, the flexible screens have characteristics of strong flexibility and being bendable and can decrease degrees of destroying devices accidentally. Durability of the flexible screens is greater than durability of other screens. 
     Conventional flexible screens include foldable screens and bendable screens. Although sizes of panels of the two types of display screens are decreased to a certain extent, the two types of display screens still occupy great space. 
     Consequently, there is an urgent need for a flexible display device to solve the above-mentioned technical problem. 
     SUMMARY OF DISCLOSURE 
     The present disclosure provides a display device to solve the problem that sizes of conventional flexible screens are great. 
     The present disclosure provides a display device including: 
     a case assembly, a first supporting component disposed to be fixed to the case assembly, a second supporting component disposed to be slidable relative to the first supporting component, and a transmission mechanism disposed in the case assembly and connected to the second supporting component; and 
     a flexible display screen laying on one side of the first supporting component and one side of the second supporting component, a first end of the flexible display screen connected to one end of the second supporting component far away from the first supporting component, and a second end of the flexible display screen connected to the transmission mechanism; 
     wherein when the first supporting component slides relative to the second supporting component, the two ends of the flexible display screen move, due to effect of the transmission mechanism, with the same distance in the same time. 
     In the display device of the present disclosure, the case assembly includes a first case body and a second case body which are disposed opposite to each other, the first case body is fixed to and connected to the first supporting component, and the second case body is fixed to and connected to the second supporting component; 
     the flexible display screen includes a first part disposed on a surface of the case assembly and a second part disposed in the case assembly; 
     the transmission mechanism includes at least gear set and at least one screw which are positioned on the first case body and a rack set which is positioned on the second case body, the gear set engages with the rack set, and the screw and the gear set rotate coaxially; 
     when the display device implements a small-screen display, the first part of the flexible display screen is in a display state and the second part of the flexible display screen is in a non-display state; and 
     when the display device implements a large-screen display, the rack set on the second case body drives, via the gear set, the screw to rotate, so that the second case body moves in a direction far away from the first case body, the second part of the flexible display screen moves from inside of the case assembly to the surface of the case assembly, and the first part and the second part of the flexible display screen are in the display state. 
     In the display device of the present disclosure, the rack set includes at least one first rack, and the first rack is disposed close to a first side surface or/and a second side surface of the second case body; and 
     when the display device implements the large-screen display, the first rack drives, via the gear set, the screw to rotate, so that the second case body moves in the direction far away from the first case body. 
     In the display device of the present disclosure, the gear set at least includes: 
     at least one first gear, the first gear engaging with the first rack, and the first gear positioned at one side of the first rack far away from the flexible display screen; 
     at least one second gear, and the first gear and the second gear rotating coaxially; 
     at least one first roller, and the first roller penetrating the first gear and the second gear and fixed to and connected to the first gear and the second gear; and 
     at least one third gear, the third gear engaging with the second gear, and the third gear and the screw rotating coaxially; 
     when the display device implements the large-screen display, the first rack transmits, via the first gear, the second gear, the third gear, and the first roller, a driving force to the screw, so that the second case body moves via the screw in the direction far away from the first case body. 
     In the display device of the present disclosure, the gear set further includes: 
     at least two first bearing sets, each of the first bearing sets including two first bearings, the first bearings positioned at two sides of the first roller, the first bearings fixed to and connected to the first roller, and the first gear, the second gear, and the first roller rotating in the first bearings; and 
     at least two gear stands, each of the gear stands corresponding to one of the first bearing sets, the gear stands fixed to and connected to a first side case or/and a second side case of the first case body, and the first case body and the second case body make the gear stands have a first opening toward a front case of the second case body. 
     In the display device of the present disclosure, the first gear is a spur gear, and the second gear and the third gear are bevel gears; and 
     wherein when a pitch diameter of the first gear is A, a pitch diameter of the second gear is B, a pitch diameter of the third gear is C, and a screw pitch of the screw is L, a relationship of the first gear, the second gear, the third gear, and the screw is B*L=π*A*C. 
     In the display device of the present disclosure, the display device further includes: 
     a sliding block, and the sliding block slidably connected to the screw; and 
     a second roller positioned at one side of the first case body far away from the gear set, and the second part of the flexible display screen extending to inside of the first case body along the second roller and fixed to and connected to the sliding block; 
     wherein when the display device implements the large-screen display, the external driving force drives the second case body to move in the direction far away from the first case body and the screw drives the sliding block to move in a direction far away from the first gear, so that the second part of the flexible display screen moves from the inside of the first case body to a surface of the first case body; and 
     when the display device implements the small-screen display, the external driving force drives the second case body to move in a direction close to the first case body, the screw drives the sliding block to move in a direction close to the first gear, and the flexible display screen rolls along the second roller, so that the second part of the flexible display screen moves from the surface of the first case body to the inside of the first case body and extends toward a direction of the first roller. 
     In the display device of the present disclosure, the flexible display screen includes a display panel, a tensile layer, and an adhesive layer positioned between the display panel and the tensile layer, a first terminal of the tensile layer is fixed to and connected to the second case body, and a second terminal of the tensile layer is fixed to and connected to the sliding block. 
     In the display device of the present disclosure, an area of the display panel is smaller than an area of the tensile layer. 
     In the display device of the present disclosure, the flexible display screen further includes a third part fixed to and connected to the sliding block, the third part of the flexible display screen corresponds to the tensile layer, and the third part of the flexible display screen is a non-functional area of the display device. 
     In the display device of the present disclosure, a material of the tensile layer is a tensible material including a sus metallic material or an amorphous material. 
     In the display device of the present disclosure, the adhesive layer is a viscous layer including an optical adhesive. 
     In the display device of the present disclosure, the first case body includes a rear case and a first side case and a second side case which are positioned at two sides of the rear case, the second case body includes a front case, the first supporting component is fixed to and connected to the rear case, the first side case, and the second side case, and the second supporting component is fixed to and connected to the front case; 
     the first supporting component includes a first supporting plate, and the first supporting plate includes a plurality of first supporting bars and a plurality of first insertion holes each positioned between two adjacent ones of the first supporting bars; 
     the second supporting component includes a second supporting plate, and the second supporting plate includes a plurality of second supporting bars and a plurality of second insertion holes each positioned between two adjacent ones of the second supporting bars; 
     when the display device implements the small-screen display, the first insertion holes are configured to contain the second supporting bars and the second insertion holes are configured to contain the first supporting bars, so that the first supporting plate cooperates with the second supporting plate to support the first part of the flexible display screen; and 
     when the display device implements the large-screen display, the second supporting component moves in the direction far away from the first case body, the second part of the flexible display screen moves from inside of the first case body to a surface of the first case body, the second supporting plate is separated from the first supporting plate, the second supporting component is configured to support the first part of the flexible display screen, and the first supporting component is configured to support the second part of the flexible display screen. 
     In the display device of the present disclosure, the first supporting component further includes a first bottom plate positioned at one side of the first supporting plate far away from the flexible display screen, and the second supporting component further includes a second bottom plate positioned at one side of the second supporting plate far away from the flexible display screen; and 
     a first gap is formed between the first bottom plate and the first supporting plate, and the first gap is configured to contain the second bottom plate; or a second gap is formed between the second bottom plate and the second supporting plate, and the second gap is configured to contain the first bottom plate. 
     In the display device of the present disclosure, the display device further includes an elevating mechanism configured to adjust the first bottom plate or/and the second bottom plate; 
     when the display device implements the large-screen display, the elevating mechanism is configured to drive the first bottom plate or/and the second bottom plate to move in a direction close to the flexible display screen, so that the first bottom plate or/and the second bottom plate contacts with the corresponding supporting plate; and 
     when the display device implements the small-screen display, the elevating mechanism is configured to drive the first bottom plate or/and the second bottom plate to move in a direction far away from the flexible display screen, so that the first bottom plate is contained between the second bottom plate and the second supporting plate or the second bottom plate is contained between the first bottom plate and the first supporting plate. 
     In the display device of the present disclosure, the first supporting component and the second supporting component are comb-shaped structures which are in coordination with each other. 
     In the display device of the present disclosure, the case assembly further includes a processor, a driving chip, and a power assembly. 
     In the display device of the present disclosure, the case assembly further includes a motor driving device disposed therein, the motor driving device is configured to drive the transmission mechanism to work, so that the display device implements the switching of the large-screen display and the small-screen display. 
     In the present disclosure, the transmission mechanism is disposed in the display device, so that the first supporting component slides relative to the second supporting component and the two ends of the flexible display screen move with the same distance in the same time. As such, a pull tension applied to the display device is not large when the display device is stretched or folded. Damage of the flexible display screen can be avoided, and the usage life of the display device can be extended. Furthermore, the display device can implement a large-screen display or a small-screen display without increasing a size thereof. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    illustrates a structural diagram of a display device of the present disclosure. 
         FIG.  2    illustrates an exploded diagram of the display device of the present disclosure. 
         FIG.  3    illustrates a structural diagram of the display device of the present disclosure in an opened state. 
         FIG.  4    illustrates a cross-section diagram of the display device of the present disclosure in the opened state. 
         FIG.  5    illustrates an enlarged diagram of a gear set of the display device of the present disclosure. 
         FIG.  6    illustrates a structural diagram of the display device of the present disclosure in a closed state. 
         FIG.  7    illustrates a cross-section diagram of the display device of the present disclosure in the closed state. 
         FIG.  8    illustrates an expanded diagram of a flexible display screen of a display panel of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     To make the objectives, technical schemes, and technical effects of the present disclosure more clearly and definitely, the present disclosure will be described in details below by using embodiments in conjunction with the appending drawings. It should be understood that the specific embodiments described herein are merely for explaining the present disclosure but not intended to limit the present disclosure. 
     Compared to the traditional screens, the flexible screens have characteristics of strong flexibility and being bendable and can decrease degrees of destroying devices accidentally. Durability of the flexible screens is greater than durability of other screens. Although sizes of the conventional display panels are decreased to a certain extent, the conventional display panels still occupy great space. 
     Please refer to  FIG.  1    to  FIG.  8   . The present disclosure provides a display device  100  including: 
     a case assembly  10 , a first supporting component  13  disposed to be fixed to the case assembly  10 , a second supporting component  14  disposed to be slidable relative to the first supporting component  13 , and a transmission mechanism disposed in the case assembly  10  and connected to the second supporting component  14 ; and 
     a flexible display screen  20  laying on one side of the first supporting component  13  and one side of the second supporting component  14 , a first end of the flexible display screen  20  connected to one end of the second supporting component  14  far away from the first supporting component  13 , and a second end of the flexible display screen  20  connected to the transmission mechanism; 
     wherein when the first supporting component  13  slides relative to the second supporting component  14 , the two ends of the flexible display screen  20  move, due to effect of the transmission mechanism, with the same distance in the same time. 
     In the present disclosure, the transmission mechanism is disposed in the display device  100 , so that the first supporting component  13  slides relative to the second supporting component  14  and the two ends of the flexible display screen  20  move with the same distance in the same time. As such, the display device  100  can implement a large-screen display or a small-screen display without increasing a size thereof. 
     Technical schemes of the present disclosure are described as follows in conjunction with embodiments. 
     Please refer to  FIG.  1    to  FIG.  8   . The case assembly  10  may include a first case body  11  and a second case body  12  which are disposed opposite to each other. The first case body  11  is fixed to and connected to the first supporting component  13 . The second case body  12  is fixed to and connected to the second supporting component  14 . The flexible display screen  20  may include a first part  21  disposed on a surface of the case assembly  10  and a second part  22  disposed in the case assembly  10 . The transmission mechanism may include at least gear set  32  and at least one screw  40  which are positioned on the first case body  11  and a rack set  31  which is positioned on the second case body  12 . The gear set  32  engages with the rack set  31 . The screw  40  and the gear set  32  rotate coaxially. 
     When the display device  100  implements the small-screen display, the first part  21  of the flexible display screen  20  is in a display state and the second part  22  of the flexible display screen  20  is in a non-display state. When the display device  100  implements the large-screen display, the rack set  31  on the second case body  12  drives, via the gear set  32 , the screw  40  to rotate, so that the second case body  12  moves in a direction far away from the first case body  11 , the second part  22  of the flexible display screen  20  moves from inside of the case assembly  10  to the surface of the case assembly  10 , and the first part  21  and the second part of the flexible display screen  20  are in the display state. 
     In the present disclosure, the gear set  32 , the rack set  31 , and the screw  40  are disposed in the display device, and the rack set  31  and the gear set  32  drive the screw  40  to rotate, so that the second case body  12  moves in a direction far away from or close to the first case body  11 . As such, the display device  100  can implement the large-screen display or the small-screen display without increasing the size thereof. 
     Please refer to  FIG.  1   . A structural diagram of the display device  100  in a closed state is illustrated in a left side of  FIG.  1   . A structural diagram of the display device  100  in an opened state is illustrated in a right side of  FIG.  1   . A user provides driving force in a first direction for the second case body  12 , so that the second case body  12  moves in the direction far away from the first case body  11  and the display device  100  is in the opened state. Similarly, the user may provide driving force in a direction opposite to the first direction for the second case body  12 , so that the second case body  12  moves in the direction close to the first case body  11  and the display device  100  is in the closed state. 
     In the present embodiment, the first direction is a direction of opening the second case body  12 . 
     Please refer to  FIG.  2   . The first case body  11  includes a rear case  111  and a first side case  112  and a second side case  113  which are positioned at two sides of the rear case  111 . The second case body  12  includes a front case  121 . The first supporting component  13  is fixed to and connected to the rear case  111 , the first side case  112 , and the second side case  113 . The first side case  112  corresponds to a first side surface of the first case body  11 . The second side case  113  corresponds to a second side surface of the first case body  11 . The second supporting component  14  is fixed to and connected to the front case  121 . The second supporting component  14  is positioned between the first side case  112  and the second side case  113 . 
     When the display device  100  implements the large-screen display, an external driving force drives the front case  121  to move in the first direction, so that the display device  100  is in the opened state. 
     In the display device  100  of the present disclosure, the rack set  31  includes at least one first rack  311 . The first rack  311  is disposed close to a first side surface or/and a second side surface of the second case body  12 . 
     Please refer to  FIG.  2   . The rack set  31  may include two first racks  311  which are symmetrically disposed with respect to a center line of the second supporting component  14 . One of the two first racks  311  is disposed close to a first side of the second supporting component  14 , and the other of the two first racks  311  is disposed close to a second side of the second supporting component  14 . The first side of the second supporting component  14  corresponds to the first side surface of the second case body  12 . The second side of the second supporting component  14  corresponds to the second side surface of the second case body  12 . 
     In the present embodiment, the first racks  311  bond to one side of the second supporting component  14  far away from the flexible display screen  20  and fixed to and connected to the second supporting component  14 . 
     Please refer to  FIG.  3    and  FIG.  4   . When the display device  100  implements the large-screen display, the first racks  311  drive, via the gear set  32 , the screw  40  to rotate, so that the second case body  12  moves in the direction far away from the first case body  11 . 
     Furthermore, a number of the first racks  311  and a number of the gear set  32  are not limited to two. For example, plural first racks  311  and the corresponding gear sets  32  may be disposed in equal distances between the first side and the second side of the second supporting component  14 . 
     In the display device  100  of the present disclosure, the gear set  32  at least includes: 
     at least one first gear  321 , the first gear  321  engaging with the first rack  311 , and the first gear  321  positioned at one side of the first rack  311  far away from the flexible display screen  20 ; 
     at least one second gear  322 , and the first gear  321  and the second gear  322  rotating coaxially; 
     at least one first roller, and the first roller penetrating the first gear  321  and the second gear  322  and fixed to and connected to the first gear  321  and the second gear  322 ; and 
     at least one third gear  323 , the third gear  323  engaging with the second gear  322 , and the third gear  323  and the screw  40  rotating coaxially. 
     Please refer to  FIG.  5   . The gear set  32  may include the first gear  321 , the second gear  322 , the first roller, and the third gear  323 . The first gear  321  engages with the first rack  311 . The first gear  321  and the second gear  322  rotate coaxially via the first roller. The third gear  323  engages with the second gear  322 . The third gear  323  and the screw  40  rotate coaxially. 
     In the present embodiment, the first gear  321  may be a spur gear. The second gear  322  and the third gear  323  may be bevel gears. 
     In the present embodiment, when the display device  100  implements the large-screen display, the first racks  311  transmit, via the first gear  321 , the second gear  322 , the third gear  323 , and the first roller, the driving force to the screw  40 , so that the second case body  12  moves via the screw  40  in the direction far away from the first case body  11 . 
     In the display device  100  of the present disclosure, the gear set  32  may further includes: 
     at least two first bearing sets, each of the first bearing sets including two first bearings, the first bearings positioned at two sides of the first roller, the first bearings fixed to and connected to the first roller, and the first gear  321 , the second gear  322 , and the first roller rotating in the first bearings; and 
     at least two gear stands  324 , each of the gear stands  324  corresponding to one of the first bearing sets, the gear stands  324  fixed to and connected to the first side case  112  or/and the second side case  113  of the first case body  11 , and the first case body  11  and the second case body  12  make the gear stands  324  have a first opening toward the front case  121  of the second case body  12 . 
     Please refer to  FIG.  5   . A number of the first bearing sets and a number of the gear stands  324  correspond to a number of the first gears  321 . The gear stands  324  are configured to fix the first gears  321  and the second gears  322  via the first bearing sets. 
     In the present embodiment, each of the gear stands  324  includes a first plate  325 , a second plate  326 , and a third plate  327 . The first plate  325  is fixed to and connected to the first side case  112  or the second side case  113  of the first case body  11 . The second plate  326  is positioned between the first plate  325  and the third plate  327 . The third gear  323  engages with the second gear  322  via a hole of the second plate  326 . The first bearings may be positioned on the first plate  325  and the third plate  327 . 
     In the present embodiment, a structure surrounded by the rear case  111  of the first case body  11 , the second supporting component  14  of the second case body  12 , the first plate  325 , the second plate  326 , and the third plate  327  make the gear stands  324  have the first opening toward the front case  121  of the second case body  12 . 
     In the present embodiment, the first bearings may be ball bearings or plain bearings, but the present disclosure is not limited thereto. The first roller is fixed to and connected to inner bearings of the first bearings. Outside bearings of the first bearings are fixed to and connected to the first side case  112  of the first case body  11 , the second side case  113  of the first case body  11 , or the first plate  325 . The first roller and the inner bearings of the first bearings rotate in the outside bearings of the first bearings under effect of the external driving force. 
     In the display device  100  of the present disclosure, the display device  100  may further includes: 
     a sliding block  50 , and the sliding block  50  slidably connected to the screw  40 ; and 
     a second roller  60  positioned at one side of the first case body  11  far away from the gear set  32 , and the second part  22  of the flexible display screen  20  extending to inside of the first case body  11  along the second roller  60  and fixed to and connected to the sliding block  50 . 
     Please refer to  FIG.  2   . A first terminal of the flexible display screen  20  is fixed to the front case  121  of the second case body  12 , and a second terminal of the flexible display screen  20  is fixed to the sliding block  50 . When the second case body  12  moves in the first direction, the sliding block  50  correspondingly moves following the screw  40 . 
     In the present embodiment, the sliding block  50  includes a protruding structure (e.g., a ball) corresponding to a screw thread of the screw  40 . When the screw  40  rotates, the sliding block  50  may move on the screw via the protruding structure in a back and forth manner. 
     In the present embodiment, the flexible display screen  20  extends from outside of the first case body  11  to inside of the first case body  11  via the second roller  60 . The flexible display screen  20  is rotated 180 degrees via the second roller  60  and extends to the first roller, so that one terminal of the flexible display screen  20  is fixed to and connected to the sliding block  50 . 
     Please refer to  FIG.  3    and  FIG.  4   . When the display device  100  implements the large-screen display, the external driving force drives the second case body  12  to move in the direction far away from the first case body  11 . The first rack  311  drives the first roller to rotate via the first gear  321 . Since the second gear  322  and the first gear  321  and the second gear  322  rotate coaxially via the first roller, the second gear  322  engages with the third gear  323 , and the third gear  323  and the screw  40  rotate coaxially, the first rack  311  transmits the force to the screw  40 . Since the screw  40  is slidably connected to the sliding block  50 , the screw  40  rotates to drive the sliding block  50  to move in a direction far away from the first gear  321 , so that the second part  22  of the flexible display screen  20  moves from the inside of the first case body  11  to a surface of the first case body  11 . 
     Please refer to  FIG.  6    and  FIG.  7   . When the display device  100  implements the small-screen display, the external driving force drives the second case body  12  to move in a direction close to the first case body  11 . A moving direction of the gear set  32 , the rack set  31 , and the screw  40  is opposite to a moving direction in  FIG.  3    and  FIG.  4   . The screw  40  drives the sliding blocks  50  to move in a direction close to the first gear  321 , so that the second part  22  of the flexible display screen  20  moves from the surface of the first case body  11  to the inside of the first case body  11  and extends in a direction toward the first gear  321 . 
     In the present embodiment, when a pitch diameter of the first gear  321  is A, a pitch diameter of the second gear  322  is B, a pitch diameter of the third gear  323  is C, and a screw pitch of the screw  40  is L, a relationship of the first gear  321 , the second gear  322 , the third gear  323 , and the screw  40  is B*L=π*A*C. 
     For example, when a moving distance of the second case body  12  is X, a moving distance of the first rack  311  is X. Since the first gear  321  engages with the first rack  311 , a rotating arc length of the first gear  321  is X. It can be understood that a rotating radian of the first gear  321  is 2X/A. Second, since the first gear  321  and the second gear  322  rotate coaxially via the first roller, a rotating radian of the second gear  322  is equal to the rotating radian of the first gear  321 . A corresponding rotating arc length of the second gear  322  is (X*B)/A. Furthermore, since the third gear  323  engages with the second gear  322 , a rotating arc length of the third gear  323  is equal to the rotating arc length of the second gear  322 . That is, a corresponding rotating arc length of the third gear  323  is (X*B)/A, and a rotating radian of the third gear  323  is (2X*B)/(A*C). Finally, since the third gear  323  and the screw  40  rotate coaxially, a rotating radian of the screw  40  is equal to the rotating radian of the third gear  323 . A corresponding rotating arc length of the second gear  322  is (X*B)/A. The screw pitch of the screw  40  is L. A moving distance of the sliding block fixed to and connected to the screw  40  is (X*B*L)/(π*A*C) when the radian is (2X*B)/(A*C). Since the relationship of the first gear  321 , the second gear  322 , the third gear  323  is C, and the screw  40  is B*L=π*A*C, a moving distance of the sliding block  50  fixed to and connected to the screw  40  is X which is equal to the moving distance of the second case body  12 . As such, pull tension of a display panel  201  in the display device  100  can be minimum, and a usage span of the display device  100  can be increased. 
     Please refer to  FIG.  8   . The flexible display screen  20  may include the display panel  201 , a tensile layer  203 , and an adhesive layer  202  positioned between the display panel  201  and the tensile layer  203 . A first terminal of the tensile layer  203  is fixed to and connected to the second case body  12 , and a second terminal of the tensile layer  203  is fixed to and connected to the sliding block  50 . 
     In the present embodiment, the flexible display screen  20  further includes a third part  23  fixed to and connected to the sliding block  50 . The third part  23  of the flexible display screen  20  is fixed to and connected to the sliding block  50 . The third part  23  of the flexible display screen  20  is a non-functional area, that is, an invalid display area. 
     In the present embodiment, the display panel  201  may be an LCD display screen or an OLED display area. The display panel  201  may be bent to any one shape. 
     In the present embodiment, an area of the display panel  201  is smaller than an area of the tensile layer  203 . 
     In the present embodiment, the adhesive layer  202  may be a viscous layer such as an optical adhesive. 
     In the present embodiment, a material of the tensile layer  203  may be a tensible material, for example, a sus metallic material or an amorphous material. When the material of the tensile layer  203  is a sus metallic material, a thickness of the tensile layer  203  may be ranged from 25 micrometers to 35 micrometers. 
     Please refer to  FIG.  2    to  FIG.  7   . The first supporting component  13  may include a first supporting plate  131 . The first supporting plate  131  may include a plurality of first supporting bars  1311  and a plurality of first insertion holes  1312  each positioned between two adjacent ones of the first supporting bars  1311 . The second supporting component  14  may include a second supporting plate  141 . The second supporting plate  141  may include a plurality of second supporting bars  1411  and a plurality of second insertion holes  1412  each positioned between two adjacent ones of the second supporting bars  1411 . 
     In the present embodiment, the first supporting plate  131  and the second supporting component  141  may be, but is not limited to, comb-shaped structures. 
     Please refer to  FIG.  6    and  FIG.  7   . When the display device  100  implements the small-screen display, the first insertion holes  1312  are configured to contain the second supporting bars  1411  and the second insertion holes  1412  are configured to contain the first supporting bars  1311 , so that the first supporting plate  131  cooperates with the second supporting plate  141  to support the first part  21  of the flexible display screen  20 . 
     Please refer to  FIG.  3    and  FIG.  4   . When the display device  100  implements the large-screen display, the second supporting component  14  moves in the direction far away from the first case body  11 . The second part of the flexible display screen  20  moves from the inside of the first case body  11  to the surface of the first case body  11 . The second supporting plate  141  is separated from the first supporting plate  131 . The second supporting component  14  is configured to support the first part  21  of the flexible display screen  20 , and the first supporting component  13  is configured to support the second part  22  of the flexible display screen  20 . 
     Please refer to  FIG.  2    to  FIG.  7   . The first supporting component  13  further includes a first bottom plate  132  positioned at one side of the first supporting plate  131  far away from the flexible display screen  20 . The second supporting component  14  further includes a second bottom plate  142  positioned at one side of the second supporting plate  141  far away from the flexible display screen  20 . 
     A first gap is formed between the first bottom plate  132  and the first supporting plate  131 . The first gap is configured to contain the second bottom plate  142 . Alternatively, a second gap is formed between the second bottom plate  142  and the second supporting plate  141 . The second gap is configured to contain the first bottom plate  132 . The present disclosure is not limited thereto. 
     In the display device  100  of the present disclosure, the display device  100  further includes an elevating mechanism configured to adjust the first bottom plate  132  or/and the second bottom plate  142 . 
     When the display device  100  implements the large-screen display, the elevating mechanism is configured to drive the first bottom plate  132  or/and the second bottom plate  142  to move in a direction close to the flexible display screen  20 , so that the first bottom plate  132  or/and the second bottom plate  142  contacts with the corresponding supporting plate. When the display device  100  implements the small-screen display, the elevating mechanism is configured to drive the first bottom plate  132  or/and the second bottom plate  142  to move in a direction far away from the flexible display screen  20 , so that the first bottom plate  132  is contained between the second bottom plate  142  and the second supporting plate  141  or the second bottom plate  142  is contained between the first bottom plate  132  and the first supporting plate  131 . 
     In the display device  100  of the present disclosure, the case assembly  10  may further include a processor, a driving chip, a power assembly and so on. The present disclosure is not limited thereto. 
     In the display device  100  of the present disclosure, the case assembly  10  may further include a motor driving device disposed therein. The motor driving device is capable of controlling the transmission mechanism via electrical signals. Predetermined electrical signals are provided for the motor driving device via buttons or gesture operations on the screen to drive the transmission mechanism to work, so that the display device  100  implements the switching of the large-screen display and the small-screen display. 
     The present disclosure provides a display device including: a case assembly, a first supporting component disposed to be fixed to the case assembly, a second supporting component disposed to be slidable relative to the first supporting component, and a transmission mechanism disposed in the case assembly and connected to the second supporting component; and a flexible display screen laying on one side of the first supporting component and one side of the second supporting component, a first end of the flexible display screen connected to one end of the second supporting component far away from the first supporting component, and a second end of the flexible display screen connected to the transmission mechanism. In the present disclosure, the transmission mechanism is disposed in the display device, so that the first supporting component slides relative to the second supporting component and the two ends of the flexible display screen move with the same distance in the same time. As such, a pull tension applied to the display device is not large when the display device is stretched or folded. Damage of the flexible display screen can be avoided, and the usage life of the display device can be extended. Furthermore, the display device can implement a large-screen display or a small-screen display without increasing a size thereof. 
     It should be understood that the present disclosure is not limited to the exemplary examples. Those skilled in the art may achieve equivalent improvements or replacements according to the above description. The equivalent improvements and replacements should be considered to belong to the protection scope of the present disclosure.