Folding screen device

Abstract

A foldable screen device includes a hinge, a housing unit, and a screen unit. The housing unit includes two casings that connect two sides of the hinge in the left-right direction, two joint plates respectively disposed on the casings, and multiple pairs of screen rail members respectively disposed between the casings and the joint plates. Each casing has a base wall connecting the hinge, and each screen rail member has a rail groove. The screen unit is fixedly disposed on the hinge and is movably received in the rail groove. The hinge can rotate the casings between an unfolded position where the casings are in an unfolded state and an outer folding position where the base walls of the casings face each other. During the rotation of the casings between the unfolded position and the outer folding position, the screen unit is movably received in the rail groove. Thereby, the screen unit is prevented from being damaged due to the pulling and squeezing caused by the inner and outer diameter differences generated by the casings.

Description

Technical Field

[0001] The present invention relates to a screen device, and more particularly to a foldable screen device. Background Art

[0002] In recent years, smart phones have almost become an electronic device that everyone has. Coupled with the improvement of the performance of processors, batteries, etc., the speed at which people replace their mobile phones is not as frequent as when these products were first introduced. In order to bring more freshness to consumers and meet the needs of large-sized screens and portability, foldable smart phones have also gradually appeared on the market. Foldable smart phones can be mainly divided into an in-fold type and an out-fold type. The in-fold type means that when the screen is folded into two parts, the two parts of the screen are face-to-face and folded into the casing. The out-fold type means that the two parts of the screen are folded back-to-back. Among them, the size of the out-fold type smart phone in the folded state is about the size of the existing common smart phone. Consumers can usually directly operate and use it in the folded state, and can expand it to improve the visual experience when watching movies or playing mobile games. Therefore, the out-fold type smart phone is more popular among the public. However, in the folding process of some out-fold type smart phones, the inner and outer diameter differences are likely to occur between the screen and the underlying casing, resulting in the screen being pulled. In some out-fold type smart phones, the central part of the screen is not sufficiently supported by the rotating shaft after folding, which may cause damage to the screen. Summary of the Invention

[0003] An object of the present invention is to provide a foldable screen device that can solve at least one of the above problems.

[0004] The foldable screen device of the present invention includes a hinge; a housing unit including two casings connecting two sides of the hinge in the left-right direction, two joint plates respectively disposed on the casings, and a plurality of pairs of screen rail members respectively disposed between the casings and the joint plates. Each casing has a base wall connecting the hinge, and each screen rail member has a rail groove; and a screen unit fixedly disposed on the hinge and movably accommodated in the rail groove; wherein the hinge can rotate the casings between an unfolded position where the casings are in an unfolded state and an outer-folded position where the base walls of the casings face each other. During the rotation of the casings between the unfolded position and the outer-folded position, the screen unit is movably accommodated in the rail groove.

[0005] In the foldable screen device of the present invention, the screen unit includes a flexible screen fixedly connected to the hinge and two slide plates respectively movably accommodated in the rail groove. The flexible screen has a joint surface facing the hinge. The slide plates are fixedly connected to the joint surface and are spaced apart from each other. Each joint plate forms a plurality of screen chutes extending along the left-right direction. The housing unit further includes a plurality of screen sliders movably accommodated in the screen chutes and respectively fixedly connected to the slide plates.

[0006] In the folding screen device of the present invention, each housing further has a surrounding wall extending upward from the periphery of the base wall and an eaves wall extending inward from the top edge of the surrounding wall. The screen rail members are respectively disposed between the joint plate and the portions of the eaves wall extending along the left-right direction and are located on both sides of the screen unit.

[0007] In the folding screen device of the present invention, the hinge includes a base extending along the front-rear direction, a bracket module disposed below the base, and a torsion module disposed above the base and fixedly connecting the flexible screen of the screen unit. The bracket module includes two linkage brackets extending along the front-rear direction and respectively fixedly connecting the joint plates and capable of rotating relative to the base.

[0008] In the folding screen device of the present invention, the torsion module includes two outer support units extending along the front-rear direction and disposed at both ends of the base, an inner support unit extending along the front-rear direction and disposed on the base, and at least one pair of torsion piece units disposed between the outer support units and the inner support unit. Each outer support unit has a central outer support tube fixedly connecting the base, two first outer support tubes on both sides of the central outer support tube, and two second outer support tubes respectively pivotally disposed on the first outer support tubes. Each inner support unit has a central inner support tube fixedly connecting the base, two first inner support tubes on both sides of the central inner support tube, and two second inner support tubes respectively pivotally disposed on the first inner support tubes. Each torsion piece unit has a plurality of torsion piece groups arranged in a staggered manner in the front-rear direction and a plurality of connecting shafts passing through the torsion piece groups, the outer support units, and the inner support unit. Each torsion piece group includes a plurality of torsion pieces and side connecting blocks connecting the torsion pieces. The torsion pieces are stacked in the front-rear direction and abut against each other in the left-right direction to form three rows. Each torsion piece is penetrated by two connecting shafts and has tooth portions formed on both sides, so that the torsion pieces in each row can mesh with each other and pivot relative to each other. The side connecting block has a gear portion capable of meshing with one end of the torsion piece group.

[0009] In the folding screen device of the present invention, each linkage bracket has a bottom plate and two side plates connecting both sides of the bottom plate and extending along the left-right direction. The bracket module further includes two synchronization units disposed at both ends of the base and respectively connecting the corresponding side plates, so that the linkage brackets can rotate synchronously relative to the base.

[0010] The foldable screen device of the present invention. The base includes a strip-shaped connecting bar and two receiving blocks connecting the two ends of the connecting bar. Each synchronization unit has two linkage members rotatably disposed on the receiving block and respectively fixed to the corresponding side plates, and two synchronization gears rotatably disposed on the receiving block and meshing with each other and located between the linkage members. Each linkage member has a linkage gear portion meshing with the synchronization gear, a linkage shaft portion fixedly passing through the side plate, and a mounting shaft portion passing through the receiving block. When one linkage bracket rotates relative to the base, it can drive the corresponding linkage member to rotate, and drive the other linkage member to rotate through the synchronization gear, so that the linkage brackets can rotate synchronously.

[0011] The foldable screen device of the present invention. Each receiving block forms grooves at both ends in the left-right direction. Each side plate is L-shaped and forms a clamping activity groove extending in the left-right direction. The bracket module further includes four clamping members respectively movably disposed on the side plates and extending along the left-right direction, and four clamping elastic members disposed between the clamping members and the side plates. Each clamping member is movably received in the corresponding clamping activity groove and abuts against the corresponding receiving block. When the housing is in the unfolded position, it can be pushed by the elastic force of the clamping elastic member to clamp in the corresponding groove.

[0012] The foldable screen device of the present invention. The torsion module further includes two side support plates fixedly connected to the side connecting block and extending in the front-rear direction. Each linkage bracket further has at least a pair of linkage blocks fixedly connected to the bottom plate and respectively forming linkage grooves. Each torsion piece unit further has a pair of side linkage shafts respectively fixedly passing through the side connecting block and the linkage grooves of the corresponding linkage blocks of the linkage bracket, so that when the linkage bracket rotates, it can drive the side support plates, the side connecting block and the torsion piece to rotate.

[0013] The foldable screen device of the present invention. The screen unit further includes at least a pair of pushing blocks respectively fixedly connected to the sliding plate. Each joint plate forms at least one pushing activity groove corresponding to the pushing block. The bottom plate of each linkage bracket forms at least one pushing stop block. The bracket module further includes at least a pair of pushing members movably disposed on the pushing stop block and extending along the left-right direction and abutting against the pushing block, and at least a pair of pushing elastic members disposed between the pushing members and the pushing stop block. When the housing is in the unfolded position, the pushing members can be pushed by the elastic force of the pushing elastic members to push the pushing blocks and drive the sliding plates to move away from the linkage brackets respectively.

[0014] For the foldable screen device of the present invention, the hinge enables the housing to rotate between the unfolded position, the outer folded position, and the inner folded position where the joint plates face each other. During the rotation of the housing between the unfolded position, the inner folded position, and the outer folded position, the screen unit is movably received in the track groove.

[0015] The beneficial effect of the present invention is that: since the screen unit can be movably received in the track groove of the screen track member, when the housing changes between the unfolded position where the housing is in the unfolded state and the outer folded position where the base walls of the housing face each other, the screen unit can move relative to the housing, avoiding the pulling and squeezing of the screen unit caused by the inner and outer diameter differences of the housing and thus preventing damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective view of an embodiment of the foldable screen device of the present invention;

[0017] Figure 2 is an exploded perspective view of this embodiment;

[0018] Figure 3 is a top view of a housing unit of this embodiment;

[0019] Figure 4 is from Figure 3 a cross-sectional view taken along the cutting plane line IX-IX;

[0020] Figure 5 is a side view of the housing unit of this embodiment;

[0021] Figure 6 is from Figure 1 an incomplete cross-sectional view taken along the cutting plane line XI-XI;

[0022] Figure 7 is a perspective view of a screen unit of this embodiment;

[0023] Figure 8 is an exploded perspective view of a hinge of this embodiment;

[0024] Figure 8A is Figure 8 a partial enlarged view;

[0025] Figure 9 is an exploded perspective view of a torsion module of the hinge of this embodiment;

[0026] Figure 9A is Figure 9 a partial enlarged view;

[0027] Figure 10is a front view of the torsion module of the hinge of this embodiment;

[0028] Figure 11 is a perspective view of this embodiment, showing the housing in an inner folded position;

[0029] Figure 12 is a partial perspective view of this embodiment, showing the housing in an outer folded position, where the screen unit is omitted;

[0030] Figure 13 is an incomplete perspective view of the torsion module of the hinge of this embodiment, showing the torsion module in a state where the housing is in the inner folded position;

[0031] Figure 14 is a front view of the torsion module of the hinge of this embodiment, showing the torsion module in a state where the housing is in the inner folded position;

[0032] Figure 15 is a front view of the torsion module and a bracket module of the hinge of this embodiment, showing the torsion module and the bracket module in a state where the housing is in the inner folded position;

[0033] Figure 16 is a front view of the torsion module and a bracket module of the hinge of this embodiment, showing the torsion module and the bracket module in a state where the housing is in the deployed position;

[0034] Figure 17 is a partial front view of the torsion module and a bracket module of the hinge of this embodiment, showing the engaging member engaged in the groove of the receiving block, where the linkage bracket is omitted;

[0035] Figure 18 is an incomplete perspective view of the torsion module of the hinge of this embodiment, showing the torsion module in a state where the housing is in the outer folded position;

[0036] Figure 19 is a front view of the torsion module of the hinge of this embodiment, showing the torsion module in a state where the housing is in the outer folded position; and

[0037] Figure 20 is a front view of the torsion module and a bracket module of the hinge of this embodiment, showing the torsion module and the bracket module in a state where the housing is in the outer folded position. Detailed Description of the Embodiment

[0038] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0039] Refer to Figure 1and Figure 2 , an embodiment of the folding screen device 100 of the present invention includes a hinge 10, a housing unit 1, and a screen unit 2.

[0040] Referring to Figures 3 to 6 , the housing unit 1 includes two casings 11 connected to both sides of the hinge 10 in a left-right direction D2, two joint plates 12 respectively disposed on the casings 11, a plurality of screen sliders 13 movably disposed on the joint plates 12, and a plurality of pairs of screen rail members 14 respectively disposed between the casings 11 and the joint plates 12. Each casing 11 has a base wall 111 connected to the hinge 10, a surrounding wall 112 extending upward from the periphery of the base wall 111, and an eaves wall 113 extending inward from the top edge of the surrounding wall 112. Each joint plate 12 is spaced apart from the base wall 111 and the eaves wall 113 of the casing 11 in an up-down direction D3, and forms a plurality of screen chutes 121 extending along the left-right direction D2, two pushing slots 122 extending along the left-right direction D2 and spaced apart from the screen chutes 121, and a plurality of circular through holes 123. The screen sliders 13 are movably received in the screen chutes 121 and are respectively fixed to the screen unit 2. The joint plate 12, the surrounding wall 112, and the eaves wall 113 define a movable space S for the screen unit 2 to be movably received. The screen rail members 14 have rail grooves 141 and are respectively disposed between the portions of the joint plate 12 and the eaves wall 113 extending along the left-right direction D2, on both sides of the screen unit 2, and within the movable space S.

[0041] Referring to Figure 2 , Figure 6 and Figure 7 , the screen unit 2 is fixedly disposed on the hinge 10 and is movably received in the rail grooves 141, and includes a flexible screen 21 fixed to the hinge 10, two slide plates 22 respectively movably received in the rail grooves 141 of the screen rail members 14, a plurality of positioning ribs 23 arranged along a front-back direction D1 and fixed to the center of the joint surface 211 of the flexible screen 21 facing the hinge 10, four pushing blocks 24 fixed to the slide plates 22 and movably received in the pushing slots 122, and a plurality of joint columns 25 fixed to the slide plates 22 and extending toward the joint plate 12. The slide plates 22 are fixed to the screen sliders 13 by the joint columns 25. Among them, the number of the screen sliders 13, the screen chutes 121, the positioning ribs 23, the pushing blocks 24, the pushing slots 122, and the joint columns 25 is not limited to the number shown in this embodiment, and can be adjusted according to the situation in other embodiments.

[0042] Referring to Figure 2 and Figure 8, the hinge 10 includes a base 3 extending along the front-rear direction D1, a bracket module 5 disposed below the base 3, a torsion module 4 disposed above the base 3 and fixedly connecting the flexible screen 21 of the screen unit 2, and a covering member 6 disposed below the bracket module 5. The base 3 includes a long connecting strip 31 and two receiving blocks 32 connecting both ends of the connecting strip 31. Each receiving block 32 forms grooves 321 at both ends in the left-right direction.

[0043] Referring to Figures 8 to 10 , the torsion module 4 includes two outer support units 41 extending along the front-rear direction D1 and disposed at both ends of the base 3, two middle support units 42 extending along the front-rear direction D1 and disposed on the base 3, an inner support unit 43 extending along the front-rear direction D1 and disposed on the base 3, two pairs of torsion plate units 44 disposed between the outer support units 41 and the inner support unit 43, and two side support plates 45 extending along the front-rear direction D1 and located on both sides to abut against the screen unit 2. Each outer support unit 41 has a central outer support tube 411 fixedly connecting to the base 3, two first outer support tubes 412 located on both sides of the central outer support tube 411, and two second outer support tubes 413 respectively pivotally connected to the first outer support tubes 412. Each middle support unit 42 is located between two torsion plate units 44 and has a central middle support tube 421 fixedly connecting to the base 3, two first middle support tubes 422 located on both sides of the central middle support tube 421, and two second middle support tubes 423 respectively pivotally connected to the first middle support tubes 422. Each inner support unit 43 has a central inner support tube 431 fixedly connecting to the base 3, two first inner support tubes 432 located on both sides of the central inner support tube 431, and two second inner support tubes 433 respectively pivotally connected to the first inner support tubes 432. The components of the outer support unit 41, the middle support unit 42, and the inner support unit 43 are generally different in length and all extend along the same straight line in the front-rear direction D1. The positioning ribs 23 of the screen unit 2 are respectively inserted into the central outer support tube 411, the central middle support tube 421, and the central inner support tube 431, thereby fixedly connecting the flexible screen 21 to the torsion module 4.

[0044] Each torsion plate unit 44 has a plurality of torsion plate groups arranged staggered in the front-rear direction D1 and a plurality of connecting shafts 443 passing through the torsion plate groups. Among them, the connecting shafts 443 of the two torsion plate units 44 closer to the outer support unit 41 pass through the torsion plate groups, the outer support unit 41 and the middle support unit 42, and the connecting shafts 443 of the two torsion plate units 44 closer to the inner support unit 43 pass through the torsion plate groups, the inner support unit 43 and the middle support unit 42. With such a design, the outer support unit 41, the middle support unit 42, the inner support unit 43 and the torsion plate unit 44 can all rotate synchronously. Each torsion plate group includes a plurality of torsion plates 441 and a side connecting block 442 connecting the torsion plates 441 and fixedly connecting to the side support plate 45. The torsion plates 441 are stacked in the front-rear direction D1 and abut against each other in the left-right direction D2 to form three rows. The number of stacks in the front-rear direction D1 depends on the thickness of the side connecting block 442 in the front-rear direction D1. In this embodiment, it is four layers but not limited thereto. Each torsion plate 441 is passed through by two connecting shafts 443 and has tooth portions 441a formed on both sides, so that the torsion plates 441 in each row can mesh with each other and pivot relative to each other. The side connecting block 442 has a gear portion 442a that can mesh with one end of the torsion plate group.

[0045] Refer to Figure 2 , Figure 8 and Figure 8A, the bracket module 5 includes two linkage brackets 51 extending along the front-rear direction D1, respectively fixed to the joint plate 12 and rotatable relative to the base 3, and two synchronization units 52 disposed at both ends of the base 3. Each linkage bracket 51 has a bottom plate 511, two side plates 512 extending along the left-right direction D2 on both sides of the bottom plate 511, and four linkage blocks 513 fixed to the bottom plate 511 and respectively forming a linkage groove 513a. The bottom plate 511 forms four sliding grooves 511a extending along the left-right direction D2, eight protruding posts 511b, and two push-stop blocks 511c. The linkage bracket 51 is fixed to the joint plate 12 by passing the protruding posts 511b through the corresponding through holes 123 of the joint plate 12. Each side plate 512 is L-shaped and forms a clamping movable groove 512a extending in the left-right direction D2. Each torsion piece unit 44 further has a pair of side linkage shafts 444 respectively fixedly passing through the side connection blocks 442 and the linkage grooves 513a of the corresponding linkage blocks 513 of the linkage brackets 51, so that when the linkage brackets 51 rotate, the side support plates 45, the side connection blocks 442, and the torsion pieces 441 can be driven to rotate. The side linkage shafts 444 are movably passed through the linkage grooves 513a. Each synchronization unit 52 has two linkage members 521 rotatably disposed on the receiving block 32 and respectively fixed to the corresponding side plates 512, and two synchronization gears 522 rotatably disposed on the receiving block 32 and meshing with each other and located between the linkage members 521. Each linkage member 521 has a linkage gear portion 521a meshing with the synchronization gear 522, a linkage shaft portion 521b fixedly passing through the side plate 512, and an installation shaft portion 521c passing through the receiving block 32. When one linkage bracket 51 rotates relative to the base 3, it can drive the corresponding linkage member 521 to rotate, and through the synchronization gear 522, the other linkage member 521 can be driven to rotate, so that the linkage brackets 51 can rotate synchronously.

[0046] The bracket module 5 further includes two pairs of pushing members 53 movably disposed on the push-stop blocks 511c and extending along the left-right direction D2 and abutting against the push blocks 24, two pairs of pushing elastic members 54 disposed between the pushing members 53 and the push-stop blocks 511c, four clamping members 55 respectively movably disposed on the side plates 512 and extending along the left-right direction D2, four clamping elastic members 56 disposed between the clamping members 55 and the side plates 512, and four sliding blocks 57 movably received in the sliding grooves 511a. Each clamping member 55 is movably received in the corresponding clamping movable groove 512a and abuts against the corresponding receiving block 32. The covering member 6 is adapted to shield the bracket module 5 and the base 3, and is slidable relative to the linkage bracket 51 by fixing the sliding blocks 57.

[0047] Refer to Figure 1, Figure 11 and Figure 12 The hinge 10 can make the housing 11 rotate between an inner folding position where the joint plates 12 face each other, an unfolded position where the housing 11 is unfolded, and an outer folding position where the base walls 111 of the housing 11 face each other, that is, the foldable screen device 100 can be unfolded from 0 degrees to 180 degrees or even 360 degrees. During the rotation of the housing 11 between the inner folding position and the unfolded position, and between the unfolded position and the outer folding position, the screen unit 2 is movably accommodated in the track groove 141.

[0048] See also Figure 2 , Figures 13 to 15 In the inner folded position, the surfaces of the support tubes of the side support plate 45, the outer support unit 41, the middle support unit 42 and the inner support unit 43 jointly define a water drop-shaped space that is sufficient to accommodate the screen unit 2 without excessive bending or compression of the screen unit 2. Figure 1 , Figure 8 , Figure 10 , Figure 16 and Figure 17 When switching from the inner folding position to the unfolded position, the housing 11 and the linkage bracket 51 rotate downward, driving the abutment member 55 to move along the outer surface of the receiving block 32 and finally being pushed by the elastic force of the abutment elastic member 56 to abut against the corresponding groove 321, providing a locked feel so that the housing 11 will not be separated from the unfolded position due to a slight external force, which is convenient for users to watch. At the same time, the abutment member 53 is also subject to the elastic force of the abutment elastic member 54 to push the abutment block 24 and drive the slide plate 22 to move away from the linkage bracket 51, thereby providing an outward pulling force to the flexible screen 21, so that the flexible screen 21 can be flattened more quickly. See. Figure 2 , Figures 18 to 20, when transitioning from this unfolded position to this outer folding position, the first outer support tube 412 of the outer support unit 41 pivots downward relative to the central outer support tube 411 and the second outer support tubes 413 pivot downward relative to the first outer support tube 412 respectively; the first middle support tube 422 of the middle support unit 42 pivots downward relative to the central middle support tube 421 and the second middle support tubes 423 pivot downward relative to the first middle support tube 422 respectively; the first inner support tube 432 of the inner support unit 43 pivots downward relative to the central inner support tube 431 and the second inner support tubes 433 pivot downward relative to the first inner support tube 432 respectively, and the torsion generated when the torsion sheet units 44 are closely stacked on each other during rotation can stably maintain the housing 11 in this outer folding position. At this time, the surfaces of the support tubes of the outer support unit 41, the middle support unit 42, and the inner support unit 43 together form a semi-circular support surface to support the screen unit 2. And because the screen unit 2 is movable relative to the housing 11, the flexible screen 21 can closely fit the above-mentioned support surface without being damaged due to extrusion deformation. Referring further to Figure 2 , Figures 13 to 15 , similarly, when the folding screen device 100 is not in use, the user can close the housing 11 to transition the housing 11 to this inner folding position. When transitioning from this unfolded position to this inner folding position, the first outer support tube 412 of the outer support unit 41 pivots upward relative to the central outer support tube 411 and the second outer support tubes 413 pivot upward relative to the first outer support tube 412 respectively; the first middle support tube 422 of the middle support unit 42 pivots upward relative to the central middle support tube 421 and the second middle support tubes 423 pivot upward relative to the first middle support tube 422 respectively; the first inner support tube 432 of the inner support unit 43 pivots upward relative to the central inner support tube 431 and the second inner support tubes 433 pivot upward relative to the first inner support tube 432 respectively, and the torsion generated when the torsion sheet units 44 are closely stacked on each other during rotation can also stably maintain the housing 11 in this inner folding position. At this time, the screen unit 2 is accommodated in the aforementioned water-drop-shaped space without being damaged due to excessive bending of the screen unit 2.

[0049] In summary, for the folding screen device 100 of the present invention, the slide plate 22 of the screen unit 2 is movably accommodated in the track groove 141 of the screen track member 14. When the housing 11 is transformed between this unfolded position in the unfolded state of the housing 11 and this outer folding position where the base wall 111 of the housing 11 faces each other, the screen unit 2 can move relative to the housing 11, avoiding the screen unit 2 from being damaged due to the pulling and squeezing caused by the inner and outer diameter differences generated by the housing 11. Therefore, the object of the present invention can be truly achieved.

[0050] The above are only the embodiments of the present invention, and the scope of implementation of the present invention cannot be limited thereby. All simple equivalent changes and modifications made according to the claims of the present invention and the content of the patent specification still fall within the scope covered by the patent of the present invention.

Claims

1. A foldable screen device, characterized in that, The foldable screen device includes: A hinge; A housing unit, including two casings connecting the two sides of the hinge in the left - right direction, two joint plates respectively arranged on the casings, and multiple pairs of screen rail members respectively arranged between the casings and the joint plates. Each casing has a base wall connecting the hinge, and each screen rail member has a rail groove; and A screen unit, fixedly arranged on the hinge and movably accommodated in the rail groove; Wherein, the hinge can rotate the casings between an unfolded position where the casings are in an unfolded state and an outer - fold position where the base walls of the casings face each other. During the rotation of the casings between the unfolded position and the outer - fold position, the screen unit is movably accommodated in the rail groove. The screen unit includes a flexible screen fixedly connected to the hinge and two sliding plates respectively movably accommodated in the rail groove. The flexible screen has a joint surface facing the hinge. The sliding plates are fixedly connected to the joint surface and are spaced from each other. Each joint plate forms multiple screen sliding grooves extending along the left - right direction. The housing unit further includes multiple screen sliders movably accommodated in the screen sliding grooves and respectively fixedly connected to the sliding plates. Each casing further has a surrounding wall extending upward from the periphery of the base wall and an eaves wall extending inward from the top edge of the surrounding wall. The screen rail members are respectively arranged between the joint plates and the portions of the eaves wall extending along the left - right direction and are located on both sides of the screen unit.

2. The foldable screen device according to claim 1, characterized in that: The hinge includes a base extending along the front - rear direction, a bracket module arranged below the base, and a torsion module arranged above the base and fixedly connected to the flexible screen of the screen unit. The bracket module includes two linkage brackets extending along the front - rear direction, respectively fixedly connected to the joint plates and capable of rotating relative to the base.

3. The foldable screen device according to claim 2, characterized in that: The torsion module includes two outer support units extending along the front - rear direction and arranged at both ends of the base, an inner support unit extending along the front - rear direction and arranged on the base, and at least one pair of torsion - sheet units arranged between the outer support units and the inner support unit. Each outer support unit has a central outer support tube fixedly connected to the base, two first outer support tubes on both sides of the central outer support tube, and two second outer support tubes respectively pivotally arranged on the first outer support tubes. Each inner support unit has a central inner support tube fixedly connected to the base, two first inner support tubes on both sides of the central inner support tube, and two second inner support tubes respectively pivotally arranged on the first inner support tubes. Each torsion - sheet unit has multiple torsion - sheet groups arranged in an alternating pattern in the front - rear direction and multiple connecting shafts passing through the torsion - sheet groups, the outer support units, and the inner support units. Each torsion - sheet group has multiple torsion sheets and side connection blocks connecting the torsion sheets. The torsion sheets are stacked in the front - rear direction and abut against each other in the left - right direction to form three rows. Each torsion sheet is penetrated by two connecting shafts and has tooth portions formed on both sides, so that the torsion sheets in each row can mesh with each other and pivot relative to each other. The side connection block has a gear portion capable of meshing with one end of the torsion - sheet group.

4. The foldable screen device according to claim 3, characterized in that: Each linkage bracket has a bottom plate and two side plates connecting both sides of the bottom plate and extending along the left-right direction. The bracket module further includes two synchronization units disposed at both ends of the base and respectively connecting the corresponding side plates, so that the linkage bracket can rotate synchronously relative to the base.

5. The foldable screen device according to claim 4, characterized in that: The base includes a long connecting bar and two receiving blocks connecting both ends of the connecting bar. Each synchronization unit has two linkage members rotatably disposed in the receiving block and respectively fixed to the corresponding side plates, and two synchronization gears rotatably disposed in the receiving block and meshing with each other and located between the linkage members. Each linkage member has a linkage gear portion meshing with the synchronization gear, a linkage shaft portion fixedly passing through the side plate, and a mounting shaft portion passing through the receiving block. When one linkage bracket rotates relative to the base, it can drive the corresponding linkage member to rotate, and drive the other linkage member to rotate through the synchronization gear, so that the linkage brackets can rotate synchronously.

6. The foldable screen device according to claim 5, characterized in that: Each receiving block forms grooves at both ends in the left-right direction. Each side plate is L-shaped and forms a clamping activity groove extending in the left-right direction. The bracket module further includes four clamping members respectively movably disposed on the side plates and extending along the left-right direction, and four clamping elastic members disposed between the clamping members and the side plates. Each clamping member is movably received in the corresponding clamping activity groove and abuts against the corresponding receiving block, and when the housing is in the unfolded position, it can be pushed by the elastic force of the clamping elastic member to abut against the corresponding groove.

7. The foldable screen device according to claim 5, characterized in that: The torsion module further includes two side support plates fixedly connected to the side connection blocks and extending along the front-back direction. Each linkage bracket further has at least a pair of linkage blocks fixedly connected to the bottom plate and respectively forming linkage grooves. Each torsion plate unit further has a pair of side linkage shafts respectively fixedly passing through the side connection blocks and the linkage grooves of the corresponding linkage blocks of the linkage brackets, so that when the linkage brackets rotate, they can drive the side support plates, the side connection blocks and the torsion plates to rotate.

8. The foldable screen device according to claim 5, characterized in that: The screen unit further includes at least a pair of pushing blocks respectively fixedly connected to the sliding plates. Each joint plate forms at least one pushing activity groove corresponding to the pushing block. The bottom plate of each linkage bracket forms at least one pushing and blocking block. The bracket module further includes at least a pair of pushing members movably disposed on the pushing and blocking blocks and extending along the left-right direction and abutting against the pushing blocks, and at least a pair of pushing elastic members disposed between the pushing members and the pushing and blocking blocks. When the housing is in the unfolded position, the pushing members can be pushed by the elastic force of the pushing elastic members to push the pushing blocks and drive the sliding plates to move away from the linkage brackets respectively.

9. The foldable screen device according to claim 1, characterized in that: The hinge can enable the housing to rotate between the unfolded position, the outer folding position and the inner folding position where the joint plates face each other. During the rotation of the housing between the unfolded position, the inner folding position and the outer folding position, the screen unit is movably received in the track groove.

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