Foldable support device and foldable display device

Abstract

The present application provides a foldable support device and a foldable display device, wherein the foldable support device comprises two rotating members, which are arranged adjacent to each other along a first direction, the two rotating members rotate synchronously, and the rotating members have a rotation center; two supporting members, which are arranged on both sides of the two rotating members along the first direction, the two supporting members are respectively connected to the two rotating members, and the rotating members drive the supporting members to move; wherein, during the folding process of the foldable support device, the distance between the rotation centers of the two rotating members rotating synchronously tends to decrease. Therefore, the foldable support device and the foldable display device provided by the present application can improve the crease of the flexible screen.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a foldable support device and a foldable display device. Background Art

[0002] Flexible display panels have special product forms such as folding, large-angle bending, and curling, and are therefore being used more and more.

[0003] For example, a foldable display panel can obtain a larger display area when the display panel is flattened; when the display panel is folded, it can have a smaller storage area, which is convenient for carrying, thus attracting widespread attention. In the related art, a foldable display device may include a display panel and a foldable support device, and the foldable support device is located on the backlight side of the display panel to support the display panel.

[0004] However, the crease of the above-mentioned display panel is relatively serious. Summary of the invention

[0005] In view of at least one of the above-mentioned technical problems, an embodiment of the present application provides a foldable support device and a foldable display device, which can improve the crease of the flexible screen to improve the display effect of the flexible screen and the foldable display device.

[0006] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0007] A first aspect of an embodiment of the present application provides a foldable support device, which includes: two rotating members, which are adjacently arranged along a first direction, the two rotating members rotate synchronously, and the rotating members have a rotation center; two supporting members, which are arranged on both sides of the two rotating members along the first direction, the two supporting members are respectively connected to the two rotating members, and the rotating members drive the supporting members to move; wherein, during the folding process of the foldable support device, the distance between the rotation centers of the two synchronously rotating members tends to decrease.

[0008] The foldable support device provided in the embodiment of the present application includes two rotating members, which are adjacently arranged along a first direction, the two rotating members rotate synchronously, and the rotating members have a rotation center; two supporting members are arranged on both sides of the two rotating members along the first direction, and the supporting members are used to support the flexible screen. The two supporting members are respectively connected to the two rotating members, and the rotating members drive the supporting members to move. In the folding process of the foldable support device, the distance between the rotation centers of the two synchronously rotating members tends to decrease, so that during the bending process of the flexible screen, the bending radius of at least part of the bending portion of the flexible screen is increased, thereby alleviating the crease of the flexible screen.

[0009] In a possible implementation, during the folding process of the foldable support device, the distance between the rotation centers of the two synchronously rotating members gradually decreases, so that during the bending process of the flexible screen, the bending radius of at least part of the bending portion of the flexible screen gradually increases, thereby alleviating the crease of the flexible screen.

[0010] It can be realized that the rotating member is an involute gear, and the two rotating members rotating synchronously are meshed with each other.

[0011] In this way, the process of involute gears is relatively mature and its preparation is relatively simple.

[0012] In a possible embodiment, the foldable support device also includes an assembly part, which is provided with two first slides spaced apart along a first direction, the first slides extend obliquely along the thickness direction of the foldable support device, and the rotating member is provided with a first slider, which is correspondingly slidably connected with the first slides.

[0013] In this way, the distance between the rotation centers of the two synchronously rotating rotating members can be adjusted through the two first slideways.

[0014] In a possible implementation, the support member is movably connected to the rotating member;

[0015] It can be realized that the foldable supporting device further includes a connecting member, and the supporting member and the rotating member are movably connected through the connecting member.

[0016] In a possible implementation, the foldable support device further includes a connecting member, the connecting member including a first connecting end connected to the rotating member and a second connecting end connected to the supporting member;

[0017] It can be realized that the support member is provided with a second slideway, and the second connecting end is slidably connected to the second slideway;

[0018] It can be realized that a second elastic member is provided between the inner wall surface of the second slideway and the second connecting end.

[0019] In this way, jittering of the second connection end can be avoided.

[0020] In a possible implementation, the second connecting end is provided with a second slider, and the second slider is slidably connected to the second slideway;

[0021] It can be realized that a second elastic member is arranged between the inner wall surface of the second slideway and the second sliding block.

[0022] In a possible embodiment, the support member includes a fixed portion and a movable portion arranged along the thickness direction of the foldable support device, the movable portion is connected to the rotating member, the fixed portion and the movable portion are movably connected, the movable portion is movable relative to the fixed portion, and a side of the movable portion facing away from the fixed portion has a support surface;

[0023] It can be achieved that, during the folding process of the foldable support device, the distance between the fixed part and the movable part in the thickness direction gradually decreases;

[0024] It can be realized that the support member is a planar support member.

[0025] In this way, when the foldable device is in the folded state, it can be avoided that the gap between the flexible screens on two adjacent planar support members is too small and squeezes each other.

[0026] In a possible implementation, the moving portion includes a first extension segment and a second extension segment connected to each other, the second extension segment is connected to the rotating member, and the first extension segment and the second extension segment are connected via a first elastic member;

[0027] It can be realized that, along the arrangement direction of the first extension section and the second extension section, the extension length of the first extension section is greater than the extension length of the second extension section.

[0028] In this way, the phenomenon of stress concentration caused by the first extension section pulling or squeezing the flexible screen during the folding process can be avoided.

[0029] In a possible implementation, the foldable support device further includes a lifting assembly, which is disposed between the fixed portion and the movable portion and is used to adjust the distance between the fixed portion and the movable portion along the thickness direction of the foldable support device;

[0030] It can be achieved that, along the thickness direction of the foldable support device, the distance between the rotation center and the fixing portion is greater than or equal to the distance between the support surface and the fixing portion;

[0031] What can be achieved is that half of the distance between the rotation centers of the two synchronously rotating parts is a first value, and along the thickness direction of the foldable support device, the distance between the rotation center and the fixed part minus the distance between the support surface and the fixed part is a second value, and during the folding process of the foldable support device, the sum of the first value and the second value is the same.

[0032] In this way, the moving part can be driven to move closer to or away from the fixed part by the lifting assembly.

[0033] In a possible implementation, the lifting assembly includes a first lifting member, a second lifting member, and a first driving member, the first driving member is connected to the first lifting member, the first lifting member and the second lifting member cooperate, one of the first lifting member and the second lifting member is connected to the fixed portion, and the other of the first lifting member and the second lifting member is connected to the moving portion to drive the moving portion to approach or move away from the fixed portion;

[0034] It can be realized that the first lifting member and the second lifting member are matched by threads, or the first lifting member and the second lifting member are matched by a tooth structure;

[0035] It can be realized that the first lifting member is provided with a through hole, the hole wall of the through hole has an internal thread, the second lifting member is inserted in the through hole and the outer wall of the through hole has an external thread, the internal thread and the external thread are meshed, and the first driving member is used to drive the first lifting member to rotate;

[0036] It can be realized that the first lifting member is a gear, the second lifting member is a rack, the gear and the rack are meshed, and the first driving member is used to drive the first lifting member to rotate.

[0037] In a possible implementation, the second lifting member is connected to the fixed portion, the first lifting member is connected to the moving portion, and the first driving member drives the first lifting member so that the first lifting member drives the moving portion to approach or move away from the fixed portion;

[0038] What can be achieved is that the first lifting member is provided with a through hole, the wall surface of the through hole has an internal thread, the second lifting member is inserted in the through hole and its outer wall surface has an external thread, the internal thread and the external thread are meshed, and the first driving member is used to drive the first lifting member to rotate so that the first lifting member drives the moving part to approach or move away from the fixed part.

[0039] In a possible implementation, the lifting assembly includes a first connecting rod, a second connecting rod and a second driving member, the first connecting rod and the second connecting rod are rotatably connected, the first end of the first connecting rod is connected to the moving part, the second end of the first connecting rod is connected to the fixed part, the third end of the second connecting rod is connected to the moving part, and the fourth end of the second connecting rod is connected to the fixed part;

[0040] The second driving member is connected to at least one of the first connecting rod and the second connecting rod, and the first connecting rod and the second connecting rod drive the moving part to approach or move away from the fixed part;

[0041] It can be realized that the lifting assembly further includes a first linkage member and a second linkage member, the first linkage member is connected to the first connecting rod or the second connecting rod, the second linkage member cooperates with the first linkage member, the second linkage member is connected to the second driving member, and the second driving member is used to drive the second linkage member to move;

[0042] It can be realized that the first linkage member is a rack, the second linkage member is a gear, the rack is meshed with the gear, and the second driving member is used to drive the gear to rotate.

[0043] A second aspect of an embodiment of the present application provides a foldable display device, which includes a flexible screen and the foldable supporting device in the above-mentioned first aspect, and the foldable supporting device is used to support the flexible screen.

[0044] The foldable display device provided in the embodiment of the present application may include a foldable support device, which includes two rotating members, which are adjacently arranged along a first direction, the two rotating members rotate synchronously, and the rotating members have a rotation center; two support members, which are arranged on both sides of the two rotating members along the first direction, and the support members are used to support the flexible screen. The two support members are respectively connected to the two rotating members, and the rotating members drive the support members to move. In the folding process of the foldable support device, the distance between the rotation centers of the two synchronously rotating members tends to decrease, so that in the bending process of the flexible screen, the bending radius of at least part of the bending portion of the flexible screen is increased, thereby alleviating the crease of the flexible screen.

[0045] The construction of the present application and its other inventive objectives and beneficial effects will be more clearly understood through the description of the preferred embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0047] Figure 1 It is a structural schematic diagram of a foldable support device in a flattened state;

[0048] Figure 2 A schematic diagram of the structure of a foldable support device in a folded state;

[0049] Figure 3 A top view of the foldable support device and the housing provided in an embodiment of the present application;

[0050] Figure 4 A top view of a foldable support device provided in an embodiment of the present application;

[0051] Figure 5 A schematic diagram of the structure of the flexible screen provided in an embodiment of the present application in a flattened state;

[0052] Figure 6 A schematic diagram of the structure of the flexible screen provided in an embodiment of the present application in a folded state;

[0053] Figure 7 Another top view of the foldable support device provided by an embodiment of the present application;

[0054] Figure 8 A schematic diagram of a partial structure of a foldable support device provided in an embodiment of the present application;

[0055] Fig. 9 Another top view of the foldable support device provided by an embodiment of the present application;

[0056] Fig.10 A cross-sectional view of a foldable support device provided in an embodiment of the present application;

[0057] Fig.11 Another cross-sectional view of the foldable support device provided by an embodiment of the present application;

[0058] Fig.12 A schematic diagram of the structure of the foldable support device provided in an embodiment of the present application in a folded state;

[0059] Fig.13 A schematic diagram of the structure of the assembly part and the rotating part provided in the embodiment of the present application;

[0060] Fig.14 A schematic diagram of the structure of the assembly part, the rotating part and the connecting part provided in the embodiment of the present application;

[0061] Fig.15 Another schematic diagram of the structure of the assembly part and the rotating part provided in the embodiment of the present application;

[0062] Fig.16 A schematic diagram of the structure of a rotating body provided in an embodiment of the present application;

[0063] Fig.17 A top view of a second slide provided in an embodiment of the present application;

[0064] Fig.18 A cross-sectional view of a second slideway provided in an embodiment of the present application;

[0065] Fig.19 A schematic diagram of the structure of the first extension section and the second extension section provided in an embodiment of the present application;

[0066] Fig. 20 is a curve graph of the crease depth of the flexible screen of Example 1, Example 2 and Example 3;

[0067] Fig.21 for Fig. 20 Plot of the first derivative of the crease depth;

[0068] Fig. 22 It is a force curve diagram of each film layer in the flexible screen of Example 1, Example 2 and Example 3;

[0069] Fig.23 It is a force curve diagram of the glue layer between each film layer in the flexible screen of Example 1, Example 2 and Example 3.

[0070] Description of reference numerals:

[0071] 11: first gear; 12: second gear;

[0072] 100: foldable supporting device; 110: rotating member;

[0073] 111: first rotating member; 1111: first tooth structure;

[0074] 112: second rotating member; 1121: second tooth structure;

[0075] 113: a first sliding block; 114: a rotating body;

[0076] 115: first surface; 116: second surface;

[0077] 120: a rotating support member; 121: a first rotating support member;

[0078] 122: second rotating support member; 130: planar support member;

[0079] 130a / 130A: first planar support member; 130b / 130B: second planar support member;

[0080] 131: fixing portion; 1311: first fixing portion;

[0081] 1312: second fixed portion; 132: moving portion;

[0082] 132a: first extension section; 132b: second extension section;

[0083] 1321: first moving part; 1322: second moving part;

[0084] 133: support surface; 134: second slideway;

[0085] 1341: First inner wall surface; 1342: Second inner wall surface;

[0086] 1343: third inner wall surface; 1344: fourth inner wall surface;

[0087] 1345: fifth inner wall surface; 135: accommodating cavity;

[0088] 136: third slideway; 14: connecting assembly;

[0089] 14a: connection structure; 14b: first connection structure;

[0090] 14c: second connection structure; 140: connection member;

[0091] 140a: first connection end; 140b: second connection end;

[0092] 141: a first connecting member; 142: a second connecting member;

[0093] 143: second slider; 150: assembly part;

[0094] 151: first slideway; 160: lifting assembly;

[0095] 161: first lifting member; 162: second lifting member;

[0096] 163: first connecting rod; 1631: first end;

[0097] 1632: second end; 164: second connecting rod;

[0098] 1643: the third end; 1644: the fourth end;

[0099] 166: first linkage member; 167: second linkage member;

[0100] 168: matching member; 171: first elastic member;

[0101] 172: second elastic member; 181: first matching member;

[0102] 182: second coordination member; 183: third coordination member;

[0103] 210: flexible screen; 210a: bending portion;

[0104] 210b: non-bending portion; 211b: first non-bending portion;

[0105] 212b: second non-bending portion; 220: housing;

[0106] 221: first shell; 222: second shell. DETAILED DESCRIPTION

[0107] In the related art, a foldable display device may include a flexible screen and a foldable support device located on the backlight side of the flexible screen, wherein the foldable support device supports the flexible screen. A user applies an external force to the foldable support device so that the foldable support device drives the flexible screen to bend and flatten.

[0108] like Figure 1As shown, the foldable support device includes a support member, and the support member may include a first planar support member 130A and a second planar support member 130B. The foldable support device includes a first gear 11 and a second gear 12. The first gear 11 is connected to the first planar support member 130A, and the second gear 12 is connected to the second planar support member 130B. The first gear 11 and the second gear 12 are meshed. The first planar support member 130A and the second planar support member 130B are rotatably connected through the first gear 11 and the second gear 12, so that the first planar support member 130A and the second planar support member 130B can drive the flexible screen to bend or flatten. The spacing between the first planar support member 130A and the second planar support member 130B in the first direction X (i.e. Figure 1 The distance between the midpoint D and the point E in the first direction X) corresponds to the size of the bending portion of the flexible screen in the first direction X, and the bending portion of the flexible screen is bent during the folding process.

[0109] However, the various film layers of the bent part of the flexible screen are deformed by external forces, and due to material limitations, the deformation recovery capacity of each film layer is limited. When the deformation of the film layer exceeds the limit of the deformation recovery capacity, the deformation of the film layer becomes irreversible plastic deformation; after the external force is removed, the deformation cannot be completely eliminated, and the film layer cannot be completely restored to its original shape. Therefore, creases will appear on the bent part of the flexible screen, which will affect the display effect of the foldable display device.

[0110] Among them, continue to see Figure 1 , the rotation center of the first gear 11 is A, the rotation center of the second gear 12 is B, and the distance between the rotation center A and the rotation center B is AB. Taking the flexible screen at point D (corresponding to the starting position of the bending portion of the flexible screen) as an example, the distance between the rotation center B and point D is BD, and the distance between the rotation center B and the surface of the second planar support member 130B facing the flexible screen is BC. According to the Pythagorean theorem, BD 2 =BC 2 +CD 2 . During the bending process of the flexible screen, BD can be regarded as the bending radius of the flexible screen at point D. The smaller the length of BD, the smaller the bending radius of the flexible screen at point D, the greater the deformation of the flexible screen at point D when bending, and the greater the stress it is subjected to, resulting in more severe creases. The larger the length of BD, the larger the bending radius of the flexible screen at point D, the smaller the deformation of the flexible screen at point D when bending, and the less stress it is subjected to, thereby alleviating the creases of the flexible screen. The bending radius of other parts of the bending portion of the flexible screen is similar to that of the flexible screen at point D, and will not be repeated.

[0111] like Figure 2As shown, when the first planar support member 130A and the second planar support member 130B are in a folded state, the distance between the first planar support member 130A and the second planar support member 130B is L, and the distance L is the sum of the distance AF from the rotation center A to the surface of the first planar support member 130A facing the flexible screen, the distance BC from the rotation center B to the surface of the second planar support member 130B facing the flexible screen, and the distance AB between the rotation center A and the rotation center B. AF can be equal to BC; that is, L = AF + AB + BC = AB + 2BC. Figure 1 and Figure 2 As shown, if the crease is alleviated by increasing BC and keeping CD fixed to increase BD, since the size of the bent portion of the flexible screen along the first direction X in the flattened state is a constant value (DE is a constant value in the flattened state), if CD is fixed, AB is fixed, which will cause L to increase, thereby increasing the gap between the flexible screen on the first planar support 130A and the flexible screen on the second planar support 130B in the folded state, and foreign matter can easily enter the gap, causing wear on the flexible screen. In addition, it is not conducive to the thinness of the foldable display device. If the crease is alleviated by increasing CD and keeping BC fixed to increase BD, since the size of the bent portion of the flexible screen along the first direction X in the flattened state is a constant value (DE is a constant value in the flattened state), if CD is increased, AB will decrease, which will cause L to decrease, thereby reducing the gap between the flexible screen on the first planar support 130A and the flexible screen on the second planar support 130B in the folded state, and it is easy to squeeze each other, causing damage to the flexible screen.

[0112] Based on at least one of the above technical problems, the embodiments of the present application provide a foldable support device and a foldable display device, and the foldable support device can be used for a flexible screen. The foldable support device includes two rotating members, which are adjacently arranged along a first direction, and the two rotating members rotate synchronously, and the rotating members have a rotation center; two support members are arranged on both sides of the two rotating members along the first direction, and the support members are used to support the flexible screen. The two support members are respectively connected to the two rotating members, and the rotating members drive the support members to move. Among them, during the folding process of the foldable support device, the distance between the rotation centers of the two synchronously rotating members tends to decrease, so that during the bending process of the flexible screen, the bending radius of at least part of the bending portion of the flexible screen tends to increase, thereby alleviating the crease of the flexible screen.

[0113] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0114] The following will be combined Figure 3-Figure 23 The foldable display device provided in the embodiment of the present application is described.

[0115] The embodiment of the present invention provides a foldable display device, which can be a mobile terminal or a fixed terminal such as an electronic paper, a mobile phone, a tablet computer, a television, a laptop computer, a digital photo frame, a super personal computer, a navigator, etc. The foldable display device can include a flexible screen 210 and a foldable support device 100 located on the backlight side of the flexible screen 210.

[0116] like Figure 3-Figure 5 As shown, the foldable display device may include a housing 220, a foldable support device 100 and a flexible screen 210, wherein the flexible screen 210 may be fixed to the foldable support device 100, and the foldable support device 100 is located on the backlight side of the flexible screen 210. The foldable support device 100 may drive the flexible screen 210 to fold and support the flexible screen 210. The foldable support device 100 may be located in the housing 220, and the housing 220 is used to protect the foldable support device 100. Among them, the flexible screen 210 may be directly fixed to the foldable support device 100, or the flexible screen 210 may be fixed to the foldable support device 100 through other structural members.

[0117] The flexible screen 210 provided in the embodiment of the present application is described below.

[0118] The flexible screen 210 may be an organic light-emitting diode (OLED) display screen, or a micro light-emitting diode (Micro LED) display screen.

[0119] The flexible screen 210 may include a light emitting side and a backlight side that are arranged opposite to each other. The light emitting side may be used to display images, and the backlight side is the other side of the flexible screen 210 that is arranged opposite to the light emitting side. Figure 5 The upper side of the flexible screen 210 shown in FIG. 1 is the light emitting side. Figure 5 The lower side of the flexible screen 210 shown in FIG. 1 is the backlight side.

[0120] like Figure 4, Figure 5 and Figure 6 As shown, the foldable display device includes a first direction X, a second direction Y and a third direction Z, and the first direction X, the second direction Y and the third direction Z are all different, for example, they can be perpendicular to each other. In the present application, the first direction X can be the width direction of the foldable display device, the second direction Y can be the length direction of the foldable display device, and the third direction Z can be the thickness direction of the foldable display device. The length, width and thickness in the embodiments of the present application are only for the convenience of description and do not mean any limitation on the size. For example, the width can be greater than, equal to or less than the length. Among them, the first direction X can be understood as corresponding to a straight direction when the product is flattened and corresponding to a curved direction when the product is folded.

[0121] like Figure 5 and Figure 6 As shown, the flexible screen 210 may include a bending portion 210a and a non-bending portion 210b that are adjacently arranged. For example, the bending portion 210a and the non-bending portion 210b may be arranged adjacently along the first direction X. The number of the bending portion 210a and the non-bending portion 210b is at least one, and a bending portion 210a and a non-bending portion 210b are alternately arranged. For example, the number of the bending portions 210a may be one, two, three, or any number greater than three. The number of the non-bending portions 210b may be one, two, three, or any number greater than three.

[0122] The embodiment of the present application is described by taking as an example that the number of the bending portion 210a is one, the number of the non-bending portions 210b is two, and the two non-bending portions 210b are connected via the bending portion 210a.

[0123] The two non-bending portions 210b may include a first non-bending portion 211b and a second non-bending portion 212b, and the bending portion 210a is located between the first non-bending portion 211b and the second non-bending portion 212b. The bending portion 210a can be bent and flattened, thereby achieving folding and flattening of the flexible screen 210.

[0124] The flexible screen 210 can be in a flattened state, a folded state, or any intermediate state therebetween. The state of the flexible screen 210 is also the state of the foldable support device 100 and the foldable display device. After the foldable support device 100 is connected to the flexible screen 210, the user applies force to the foldable support device 100 through the housing 220 to enable the foldable support device 100 to drive the flexible screen 210 to switch between the flattened state and the folded state.

[0125] like Figure 5As shown, the flattened state refers to the state in which the various parts of the flexible screen 210 are approximately in the same plane. At this time, the first non-bending portion 211b, the second non-bending portion 212b and the bending portion 210a are approximately in the same plane, and the angle between the first non-bending portion 211b and the second non-bending portion 212b is approximately 180 degrees. In the flattened state, the display area of ​​the flexible screen 210 is larger to ensure a better user experience.

[0126] like Figure 6 As shown, the folded state means that the bending portion 210a of the flexible screen 210 is bent, the first non-bending portion 211b and the second non-bending portion 212b at least partially overlap in the thickness direction of the flexible screen 210, and the angle between the first non-bending portion 211b and the second non-bending portion 212b is approximately 0 degrees. In the folded state, the flexible screen 210 and the foldable display device having the flexible screen 210 occupy a small area, which facilitates the storage and carrying of the foldable display device.

[0127] For example, the flexible screen 210 can be bent in a teardrop shape, so that the distance between the first non-bending portion 211b and the second non-bending portion 212b in the folded state is closer, which can reduce the entry of external foreign matter (such as dust) into the space between the first non-bending portion 211b and the second non-bending portion 212b of the flexible screen 210, thereby protecting the flexible screen 210.

[0128] like Figure 7 and Figure 8 As shown, the foldable supporting device 100 has a supporting surface 133 on the side facing the flexible screen 210 , and the supporting surface 133 is used to adhere to and connect with the flexible screen 210 .

[0129] In some embodiments, the foldable display device may be an inner foldable display device, that is, when the foldable display device is in a folded state, the folded flexible screen 210 is located inside the foldable support device 100, and the foldable support device 100 can protect the flexible screen 210. At this time, when the foldable display device is in a folded state, the display surface of the first non-bending portion 211b and the display surface of the second non-bending portion 212b are arranged to face each other.

[0130] In some embodiments, the foldable display device may be an external foldable display device, that is, when the foldable display device is in a folded state, the folded flexible screen 210 is located outside the foldable support device 100, and the flexible screen 210 can realize the display function in the folded state to meet the needs of different display scenarios. At this time, when the foldable display device is in a folded state, the display surface of the first non-bending portion 211b and the display surface of the second non-bending portion 212b are arranged opposite to each other.

[0131] The foldable support device 100 provided in an embodiment of the present application is described below.

[0132] The foldable support device 100 provided in the embodiment of the present application is described by taking as an example that the number of the rotating support members 120 is two, the number of the planar support members 130 is two, and the two rotating support members 120 are located between the two planar support members 130 .

[0133] Continue to see Figure 3 and Figure 4 The housing 220 may include a first housing 221 and a second housing 222. The two planar supports 130 are respectively a first planar support 130a and a second planar support 130b. The first planar support 130a is fixed to the first housing 221, and the second planar support 130b is fixed to the second housing 222. The two rotating supports 120 include a first rotating support 121 and a second rotating support 122.

[0134] like Figure 5 and Figure 6 As shown, along the first direction X, the foldable support device 100 includes a first planar support member 130a, a first rotating support member 121, a second rotating support member 122, and a second planar support member 130b arranged in sequence. The first rotating support member 121 and the second rotating support member 122 are arranged between the first planar support member 130a and the second planar support member 130b, and the first rotating support member 121 and the second rotating support member 122 are arranged adjacent to each other, and there is a gap between the first rotating support member 121 and the second rotating support member 122. The first planar support member 130a is arranged corresponding to the first non-bending portion 211b, and the second planar support member 130b is arranged corresponding to the second non-bending portion 212b. The planar support member 130 is used to fit with the non-bending portion 210b of the flexible screen 210. The first rotating support member 121 and the second rotating support member 122 are arranged corresponding to a bending portion 210 a , and the first rotating support member 121 and the second rotating support member 122 are used to fit with the bending portion 210 a of the flexible screen 210 .

[0135] See also Figure 4 The first planar support member 130a and the first rotating support member 121 can be rotatably connected via the connecting assembly 14, and the second planar support member 130b and the second rotating support member 122 can also be rotatably connected via the connecting assembly 14. During the folding process of the foldable display device, the planar support member 130 and the rotating support member 120 always provide planar support for the flexible screen 210.

[0136] Continue to see Figure 7 and Figure 8The connection assembly 14 includes two connection structures 14a respectively connected to the first planar support member 130a and the second planar support member 130b. The two connection structures 14a can be a first connection structure 14b and a second connection structure 14c respectively. The first connection structure 14b is connected to the first planar support member 130a, and the second connection structure 14c is connected to the second planar support member 130b.

[0137] See also Fig. 9 The first connection structure 14b includes a first connection member 141 and a first rotating member 111 connected to the first connection member 141, and the second connection structure 14c includes a second connection member 142 and a second rotating member 112 connected to the second connection member 142. The first rotating member 111 and the second rotating member 112 are rotatably connected. For example, the first rotating member 111 includes a first tooth structure 1111 ( Fig.15 ), the second rotating member 112 includes a second tooth structure 1121 ( Fig.15 ), the first tooth structure 1111 and the second tooth structure 1121 mesh with each other to achieve synchronous rotation of the first rotating member 111 and the second rotating member 112. The first connecting member 141 and the first rotating member 111 can be integrally provided or separately provided; similarly, the second connecting member 142 and the second rotating member 112 can be integrally provided or separately provided. The first rotating member 111 and the second rotating member 112 can also be referred to as the rotating member 110, and the first connecting member 141 and the second connecting member 142 can also be referred to as the connecting member 140.

[0138] Continue to see Figure 7 , illustratively, the first planar support member 130a is connected to two first connection structures 14b, and the two first connection structures 14b are arranged along the second direction Y. Similarly, the second planar support member 130b is connected to two second connection structures 14c, and the two second connection structures 14c are arranged along the second direction Y.

[0139] Exemplarily, the connection assembly 14 may further include two first fittings 181, a second fitting 182 and two third fittings 183, wherein the first fitting 181 may be connected to the rotating support 120, the second fitting 182 may be connected to the housing 220, and the third fitting 183 may be connected to the planar support 130. The first fitting 181 and the third fitting 183 are rotatably connected to each other, thereby realizing the rotatable connection between the rotating support 120 and the planar support 130. The two rotating supports 120 are rotatably connected to the second fitting 182 through the first fitting 181, respectively, thereby realizing the rotation of the two rotating supports 120. The connection assembly 14 may further include an assembly 150, which may be directly connected to the housing 220 or indirectly connected through other structural members. Both of the two planar support members 130 can be rotatably connected to the assembly member 150 via the connection structure 14 a (the first connection structure 14 b and the second connection structure 14 c ), thereby realizing the rotation of the two planar support members 130 .

[0140] See also Figure 4 , the foldable support device 100 has a flexible screen placement area S on the side facing the flexible screen 210, and the flexible screen placement area S is used to correspond to the flexible screen 210, and the flexible screen placement area S is used to place and support the flexible screen 210. At least part of the planar support member 130 and at least part of the rotating support member 120 are located in the flexible screen placement area S. In this way, both the non-bending portion 210b and the bending portion 210a can be supported. Among them, the dotted box S shows the flexible screen placement area, and the orthographic projection of the flexible screen 210 on the plane where the support surface 133 of the foldable support device 100 is located overlaps with the flexible screen placement area S. It can be understood that the flexible screen placement area S can also be a larger or smaller range than that shown in the dotted box S. For example, the connecting component 14 can be located outside the flexible screen placement area S, so that the connecting component 14 can be prevented from rubbing or squeezing the flexible screen 210 during the folding process, thereby avoiding damage to the flexible screen 210.

[0141] The planar support member 130 provided in the embodiment of the present application is described below.

[0142] like Fig. 9 and Fig.10 As shown, each planar support member 130 may include a fixed portion 131 and a movable portion 132 stacked in the thickness direction. The fixed portion 131 is located on the side of the movable portion 132 away from the flexible screen 210, and the surface of the movable portion 132 away from the fixed portion 131 forms a support surface 133. The movable portion 132 of the planar support member 130 is connected to the connecting member 140, that is, the movable portion 132 is connected to the rotating member 110 through the connecting member 140. Fig.10As shown, the connecting member 140 may include a first connecting end 140 a connected to the rotating member 110 , and the connecting member 140 may further include a second connecting end 140 b connected to the moving portion 132 .

[0143] The fixing portion 131 can be connected to the housing 220 ( Figure 3 ), the fixing portion 131 and the housing 220 may be connected by bonding, clamping, welding, threaded connection, integral molding, etc. The fixing portion 131 may be a part of the housing 220, or the fixing portion 131 and the housing 220 may be two structural members connected together. When the fixing portion 131 is a part of the housing 220, the structure of the foldable display device may be simplified.

[0144] The movable portion 132 is movably arranged along the thickness direction of the foldable support device 100. In the same planar support member 130, along the thickness direction of the planar support member 130, the movable portion 132 can move closer to or away from the fixed portion 131 to adjust the distance between the movable portion 132 and the fixed portion 131.

[0145] like Fig.11 As shown, the first planar support member 130a may include a first fixed portion 1311 and a first movable portion 1321, and the second planar support member 130b may include a second fixed portion 1312 and a second movable portion 1322. The first movable portion 1321 is connected to the first rotating member 111 via a first connecting member 141, and the second movable portion 1322 is connected to the second rotating member 112 via a second connecting member 142.

[0146] The rotating member 110 may have a rotation center, as further described in Fig.11, the first rotating member 111 has a first rotation center a, and the first rotating member 111 rotates around the first rotation center a. The second rotating member 112 has a second rotation center b, and the second rotating member 112 rotates around the second rotation center b. The distance between the first rotation center a and the second rotation center b is a first distance ab. Along the thickness direction of the foldable supporting device 100, the distance between the first rotation center a and the supporting surface 133 of the first moving part 1321 is a second distance, and the second distance is equal to the difference between the distance t1 between the first rotation center a and the first fixed part 1311 and the distance t2 between the supporting surface 133 of the first moving part 1321 and the first fixed part 1311, that is, the second distance = t1-t2. The second distance can be adjusted by adjusting the distance t3 between the first moving part 1321 and the first fixed part 1311. When t3 decreases, t2 decreases, and the second distance increases. Among them, t1 can be greater than or equal to t2, and the second distance can be greater than or equal to zero. In addition, the distance between the second rotation center b and the support surface 133 of the second mobile part 1322 is the third distance, and the third distance is equal to the difference between the distance t4 between the second rotation center b and the second fixed part 1312 and the distance t5 between the support surface 133 of the second mobile part 1322 and the second fixed part 1312, that is, the third distance = t4-t5. The third distance can be adjusted by adjusting the distance t6 between the second mobile part 1322 and the second fixed part 1312. When t6 decreases, t5 decreases, and the third distance increases. Among them, t4 can be greater than or equal to t5, and the third distance can be greater than or equal to zero.

[0147] It can be known from the above related technologies that during the folding process, the bending portion 210a ( Figure 5) increases as the first distance ab decreases; the bending radius of at least part of the bending portion 210a increases as the second distance and / or the third distance increases, wherein when t3 decreases, the second distance increases, and when t6 decreases, the third distance increases; that is, the bending radius of at least part of the bending portion 210a increases as t3 and / or t6 decreases. In the embodiment of the present application, during the folding process of the foldable support device 100, the first distance ab between the first rotation center a and the second rotation center b may show a decreasing trend, which may cause the bending radius of at least part of the bending portion 210a to show an increasing trend, thereby alleviating the crease of the flexible screen 210. For example, the first distance ab between the first rotation center a and the second rotation center b gradually decreases, which may cause the bending radius of at least part of the bending portion 210a to gradually increase, thereby alleviating the crease of the flexible screen 210. In addition, in the same planar support member 130, the distance between the fixed portion 131 and the movable portion 132 along the thickness direction of the planar support member 130 gradually decreases (i.e., t3 and t6 decrease). With such a configuration, when the foldable support device 100 is in the folded state, it is possible to avoid the gap between the flexible screens 210 on the first planar support member 130a and the second planar support member 130b being too small due to fixing t3 and t6 (equivalent to fixing the second distance and the third distance) and only reducing the first distance ab, thereby avoiding mutual squeezing of the flexible screens 210. It is also possible to avoid the gap between the flexible screens 210 on the first planar support member 130a and the second planar support member 130b being too large due to fixing the first distance ab and only reducing t3 and t6 (equivalent to increasing the second distance and the third distance), thereby avoiding foreign matter from easily entering the gap and causing wear on the flexible screens.

[0148] Exemplarily, when the foldable support device 100 switches between the folded state and the flattened state, the sum of the first distance ab, the second distance and the third distance can be the same. Among them, the second distance can be equal to the third distance, and the structures of the first rotating member 111 and the second rotating member 112 can be the same. At this time, when the foldable support device 100 switches between the folded state and the flattened state, the sum of half of the first distance ab (first value) and the second distance (second value) are the same, and the sum of half of the first distance ab and the third distance (second value) are the same. In this way, when the foldable support device 100 is in the folded state, the gap between the flexible screen 210 on the first planar support member 130a and the flexible screen 210 on the second planar support member 130b is a constant value. In addition, the smoothness of the lifting of the rotating member 110 during the folding process of the foldable support device 100 is guaranteed, so that the flexible screen 210 has a better bending force condition.

[0149] The following describes the adjustment of the first distance ab provided in the embodiment of the present application during the folding process of the foldable supporting device 100 .

[0150] like Fig.12 As shown, the assembly part 150 is used to assemble the first rotating member 111 and the second rotating member 112 that rotate synchronously. The assembly part 150 is arranged along the first direction X( Fig. 9 ) are spaced apart from each other, the two first slides 151 can be symmetrically arranged along the first direction X, and the first slides 151 extend obliquely along the thickness direction of the foldable supporting device 100, and the first rotating member 111 and the second rotating member 112 slide along the two first slides 151 respectively.

[0151] Exemplary, combined Fig.13 and Fig.14 As shown, each rotating member 110 is provided with a first slider 113, and one first slider 113 is slidably connected to one first slideway 151, and the first slider 113 can also rotate in the first slideway 151. The first slider 113 of the first rotating member 111 is inserted in one of the first slideways 151 and slides in the first slideway 151. The first slider 113 of the second rotating member 112 is inserted in another first slideway 151 and slides in the first slideway 151. Fig.13 The distance w1 between the two first slideways 151 along the first direction X gradually decreases, and the first slideway 151 is away from one end of the fixing portion 131 (i.e. Fig.13 The top of the foldable support device 100 is tilted toward the center of the assembly member 150. In this way, during the folding process of the foldable support device 100, the first rotating member 111 and the second rotating member 112 slide from bottom to top along the two first slideways 151 respectively, and the first rotating member 111 and the second rotating member 112 approach each other along the first direction X, and the first distance ab between the first rotation center a and the second rotation center b gradually decreases. During the flattening process of the foldable support device 100, the first rotating member 111 and the second rotating member 112 slide from top to bottom along the two first slideways 151 respectively, and the first rotating member 111 and the second rotating member 112 move away from each other along the first direction X, and the first distance ab between the first rotation center a and the second rotation center b gradually increases.

[0152] Among them, the assembly part 150 can be located on at least one side of the corresponding two synchronously rotating parts 110 along the second direction Y. The assembly part 150 is located on one side of the corresponding two synchronously rotating parts 110 (the first rotating part 111 and the second rotating part 112) along the second direction Y. The number of the assembly parts 150 is small, which can simplify the structure of the foldable support device 100. Along the second direction Y, the flexible screen placement area S can be located on the inner side of the two assembly parts 150. In this way, the assembly part 150 can be prevented from rubbing or squeezing the flexible screen 210 during the folding process, thereby avoiding damage to the flexible screen 210. Figure 8 As shown, the assembly parts 150 are located on both sides of the corresponding two synchronously rotating members 110 along the second direction Y, thereby providing better support for the two rotating members 110 .

[0153] Taking the first rotating member 111 as an example, Fig.15 and Fig.16 As shown, the first rotating member 111 may include a rotating body 114 and a first tooth structure 1111, and the first tooth structure 1111 is disposed on a first surface 115 of the rotating body 114. The first tooth structure 1111 at a first position P on the first surface 115 is meshed with the second rotating member 112, and during the folding process of the foldable support device 100, the distance t7 between the first rotation center a and the first position P is gradually reduced. Taking the second rotating member 112 as an example, the second rotating member 112 may include a rotating body 114 and a second tooth structure 1121, and the second tooth structure 1121 is disposed on a second surface 116 of the rotating body 114. The second tooth structure 1121 at a second position on the second surface 116 is meshed with the first rotating member 111, and during the folding process of the foldable support device 100, the distance between the second rotation center b and the second position is gradually reduced. In this way, during the folding process of the foldable supporting device 100 , the first distance ab can be gradually reduced while the first rotating member 111 and the second rotating member 112 are engaged to achieve synchronous rotation of the first rotating member 111 and the second rotating member 112 .

[0154] For example, the first rotating member 111 and the second rotating member 112 may be two involute gears meshing with each other, so as to realize the first distance ab gradually decreasing while ensuring the synchronous rotation of the first rotating member 111 and the second rotating member 112. Fig.16 As shown, the cross-sectional shape of the first surface 115 perpendicular to the planar support member 130 may be an involute; in addition, the cross-sectional shape of the second surface perpendicular to the planar support member 130 may be an involute.

[0155] Among them, the involute can refer to fixing a circular axis on a plane, winding a wire around the circular axis, tightening a wire end, allowing the wire to move around the circular axis and always be tangent to the circular axis. The trajectory of a fixed point on the line on the plane is the involute.

[0156] The following is a description of the adjustment of the distance between the fixed portion 131 and the movable portion 132 of the same planar support member 130 along the thickness direction of the planar support member 130 provided in the embodiment of the present application.

[0157] Continue to see Fig.10 and Fig.17 , the second connection end 140b of the connection member 140 is movably connected with the moving part 132 along the thickness direction of the planar support member 130. The moving part 132 may be provided with a second slideway 134, and the second connection end 140b is provided with a second slider 143, and the second slider 143 is inserted into the second slideway 134. The second connection end 140b is slidably connected with the moving part 132 through the second slideway 134 and the second slider 143. The second slideway 134 extends along the thickness direction of the planar support member 130, and the second slider 143 and the second slideway 134 move relative to each other along the thickness direction of the planar support member 130, so as to realize the moving part 132 moving close to or away from the fixed part 131.

[0158] Continue to see Fig.17 The inner wall surface of the second slideway 134 includes a first inner wall surface 1341 and a second inner wall surface 1342 which are opposite and spaced apart along the first direction X, and at least part of the second slider 143 is located between the first inner wall surface 1341 and the second inner wall surface 1342. The first inner wall surface 1341 is located on the side of the second slider 143 away from the rotating member 110, and the second inner wall surface 1342 is located on the side of the second slider 143 facing the rotating member 110. The first inner wall surface 1341 and the second inner wall surface 1342 are used to limit the position of the second slider 143 along the first direction X to prevent the second slider 143 from being separated from the moving part 132. The connecting member 140 has a width w2 along the second direction Y, and the width w2 of the second slider 143 can be greater than the width w2 of the rest of the connecting member 140. The cross-sectional shape of the second slideway 134 is adapted to the cross-sectional shape of the second slider 143 to ensure the assemblability of the second slider 143 and the second slideway 134. When the foldable supporting device 100 switches between the flattened state and the folded state, the connecting member 140 rotates around the rotation center of the rotating member 110, and the connecting member 140 drives the movable part 132 to rotate through the adaptation of the second slider 143 and the second slide 134, that is, the movable part 132 rotates around the rotation center of the rotating member 110 through the connecting member 140.

[0159] like Fig.17 As shown, the inner wall surface of the second slide 134 may include a first inner wall surface 1341 and a second inner wall surface 1342 that are opposite and spaced apart along the first direction X, and two fifth inner wall surfaces 1345 that are opposite and spaced apart along the second direction Y, and at least a portion of the fifth inner wall surface 1345 is located between the first inner wall surface 1341 and the second inner wall surface 1342.

[0160] like Fig.18 As shown, the inner wall surface of the second slideway 134 may further include a third inner wall surface 1343 and a fourth inner wall surface 1344 disposed opposite to each other along the thickness direction of the planar support member 130. The third inner wall surface 1343 is located on the side of the fourth inner wall surface 1344 facing the flexible screen 210.

[0161] A second elastic member 172 may be disposed between the inner wall surface of the second slideway 134 and the second connecting end 140b. Fig.17 As shown, the first inner wall surface 1341, the second inner wall surface 1342 and the fifth inner wall surface 1345 ( Fig.17) and the second connection end 140b. Taking the first inner wall surface 1341 as an example, one end of the second elastic member 172 is connected to the second slider 143 of the second connection end 140b, and the other end of the second elastic member 172 abuts against the first inner wall surface 1341, and the second elastic member 172 can be in a compressed state. When the second slider 143 slides, it drives the second elastic member 172 to move along the sliding direction, and the second elastic member 172 provides a thrust to the second connection end 140b, so that both ends of the connection member 140 are subjected to force, which can prevent the second connection end 140b from shaking. Alternatively, the two ends of the second elastic member 172 are respectively connected to the second slider 143 and the first inner wall surface 1341. When the second slider 143 slides, the second elastic member 172 is compressed or stretched, and the second elastic member 172 provides a thrust or a pull to the second connection end 140b, so that both ends of the connection member 140 are acted upon, and the second connection end 140b can be prevented from shaking. When there is an assembly gap between the second slider 143 and the first inner wall surface 1341, the second elastic member 172 can be located in the assembly gap to prevent the second slider 143 from moving along the assembly gap and causing the second slider 143 to shake. In some other examples, the second elastic member 172 can be arranged between at least one of the third inner wall surface 1343 and the fourth inner wall surface 1344 and the second connection end 140b. Taking the third inner wall surface 1343 as an example, one end of the second elastic member 172 can be connected to the second connection end 140b by abutting, fixed connection or detachable connection, and the other end of the second elastic member 172 can be connected to the third inner wall surface 1343 by abutting, fixed connection or detachable connection. Since the first connection end 140a is supported by the rotating member 110 and the assembly member 150, if there is no force on the second connection end 140b, the second connection end 140b will be in a free state and easily shake in the assembly gap. Therefore, a second elastic member 172 can be arranged between the third inner wall surface 1343 and the second connection end 140b. When the second connection end 140b slides, the second elastic member 172 is compressed or stretched, and the second elastic member 172 provides a thrust or a pull to the second connection end 140b, so that both ends of the connection member 140 are subjected to force, which can prevent the second connection end 140b from shaking.

[0162] Continue to see Fig.12The foldable support device 100 may include a lifting assembly 160, which is used to adjust the distance (t3 and / or t6) between the moving portion 132 and the fixed portion 131 of the same planar support member 130 along the thickness direction of the planar support member 130, so as to adjust the distance (second distance and / or third distance) between the rotation center of the rotating member 110 and the supporting surface 133 of the corresponding planar support member 130. The number of the lifting assemblies 160 may be consistent with the number of the planar support members 130, and one lifting assembly 160 is connected to one planar support member 130. During the folding process of the foldable support device 100, when the foldable support device 100 switches from the flattened state to the folded state, the lifting assembly 160 is used to adjust the distance between the fixed portion 131 and the moving portion 132 of the same planar support member 130 along the thickness direction of the planar support member 130 to gradually decrease. When the foldable support device 100 switches from the folded state to the flattened state, the lifting assembly 160 is used to adjust the distance between the fixed portion 131 and the movable portion 132 of the same planar support member 130 along the thickness direction of the planar support member 130 to gradually increase.

[0163] The lifting assembly 160 provided in the embodiment of the present application is described below.

[0164] Continue to see Fig.11 The lifting assembly 160 may include a first lifting member 161 and a second lifting member 162. The first lifting member 161 may be connected to the moving portion 132, and the second lifting member 162 may be connected to the fixing portion 131. The moving portion 132 may have an accommodating cavity 135, and the first lifting member 161 is located in the accommodating cavity 135.

[0165] In which, the lifting assembly 160 can also include a first driving member (not shown in the figure), which can be located in the accommodating cavity 135. The first driving member is connected to the first lifting member 161. The first driving member is used to provide a driving force to drive the first lifting member 161 to move along the thickness direction of the planar support member 130, so that the first lifting member 161 drives the moving part 132 to approach or move away from the fixed part 131, thereby adjusting the distance between the moving part 132 and the fixed part 131.

[0166] Exemplarily, the first lifting member 161 and the second lifting member 162 can be threadedly matched to enable the first lifting member 161 to move along the thickness direction of the planar support member 130. The first lifting member 161 can be provided with a through hole, the hole wall of the through hole has an internal thread, the second lifting member 162 is inserted in the through hole and its outer wall has an external thread, and the internal thread and the external thread are engaged. The second lifting member 162 includes a fixed end connected to the fixing portion 131 and a free end inserted in the through hole. The first driving member can drive the first lifting member 161 to rotate so that the first lifting member 161 rotates relative to the second lifting member 162, and the first lifting member 161 is moved along the thickness direction of the planar support member 130 through the engagement of the internal thread and the external thread, so that the first lifting member 161 drives the moving portion 132 to approach or move away from the fixing portion 131.

[0167] In other embodiments, the first lifting member 161 may be connected to the fixed portion 131, and the second lifting member 162 may be connected to the moving portion 132. The fixed portion 131 may have a receiving cavity 135, the first lifting member 161 and the first driving member may be located in the receiving cavity 135, the fixed end of the second lifting member 162 is connected to the moving portion 132, the free end of the second lifting member 162 is inserted into the through hole of the first lifting member 161, the first driving member may drive the first lifting member 161 to rotate, so that the first lifting member 161 rotates relative to the second lifting member 162, and the second lifting member 162 is moved along the thickness direction of the planar support member 130 through the engagement of the internal thread and the external thread, so that the second lifting member 162 drives the moving portion 132 to approach or move away from the fixed portion 131.

[0168] For example, the first driving member may be a micro motor, see Fig.11 , the lifting assembly 160 may include a matching piece 168, the matching piece 168 may be located in the accommodating cavity 135, the first driving member drives the matching piece 168 to rotate, and the matching piece 168 drives the first lifting member 161. The first lifting member 161 may be a gear, the matching piece 168 may match the gear, the first lifting member 161 and the matching piece 168 are meshed, and the first driving member drives the first lifting member 161 to rotate through the matching piece 168. Among them, the first lifting member 161 and the matching piece 168 may both be bevel gears, and the rotation axis of the first driving member may be arranged parallel to the planar support member 130 to reduce the space occupied by the first driving member in the thickness direction of the planar support member 130, thereby reducing the impact on the thickness of the foldable display device.

[0169] Continue to see Fig.11, the movable portion 132 may have a receiving cavity 135, and the first lifting member 161 is located in the receiving cavity 135, so as to reduce the impact on the thickness of the foldable display device, avoid the impact of the first lifting member 161 on the layout of other structural members, and reduce the volume occupied by the foldable support device 100. The first driving member may be located in the receiving cavity 135 to avoid the impact of the first driving member on the layout of other structural members and reduce the impact on the thickness of the foldable display device. Of course, the first lifting member 161 and / or the first driving member may also be located outside the movable portion 132. Similarly, in other embodiments, the first lifting member 161 and / or the first driving member may also be located outside the fixed portion 131.

[0170] In some other examples, the first lifting member 161 and the second lifting member 162 can cooperate through a tooth structure, one of the first lifting member 161 and the second lifting member 162 can be connected to the fixed part 131, and the other of the first lifting member 161 and the second lifting member 162 can be connected to the moving part 132 to drive the moving part 132 to approach or move away from the fixed part 131. The second lifting member 162 can be a rack, which extends along the thickness direction of the planar support member 130; the first lifting member 161 can be a gear, the rack and the gear are meshed, and the first driving member drives the gear to rotate. When the first lifting member 161 is connected to the moving part 132 and the second lifting member 162 is connected to the fixed part 131, the first driving member drives the first lifting member 161 to rotate, and the first lifting member 161 and the second lifting member 162 cooperate through the tooth structure to realize the first lifting member 161 moving along the thickness direction of the planar support member 130, so that the first lifting member 161 drives the moving part 132 to approach or move away from the fixed part 131. When the first lifting member 161 is connected to the fixed part 131 and the second lifting member 162 is connected to the movable part 132, the first driving member drives the first lifting member 161 to rotate, and the first lifting member 161 and the second lifting member 162 cooperate with each other through the tooth structure to realize the movement of the second lifting member 162 along the thickness direction of the planar support member 130, so that the second lifting member 162 drives the movable part 132 to approach or move away from the fixed part 131.

[0171] Continue to see Fig.10 The lifting assembly 160 may include a first connecting rod 163 and a second connecting rod 164, which may be rotatably connected via a connecting shaft, the connecting shaft connecting the middle section of the first connecting rod 163 and the middle section of the second connecting rod 164. The two ends of the first connecting rod 163 are respectively a first end 1631 and a second end 1632, the first end 1631 is connected to the moving part 132, and the second end 1632 is connected to the fixed part 131. The two ends of the second connecting rod 164 are respectively a third end 1643 and a fourth end 1644, the third end 1643 is connected to the moving part 132, and the fourth end 1644 is connected to the fixed part 131.

[0172] The second driving member (not shown in the figure) can be connected to one of the first connecting rod 163 and the second connecting rod 164, and the second driving member is used to drive the first end 1631 and the fourth end 1644 to move along the first direction X; or, the second driving member is used to drive the second end 1632 and the third end 1643 to move along the first direction X.

[0173] For some examples, see Fig.10 , the first end 1631 connected to the moving part 132 slides along the first direction X, and the fourth end 1644 connected to the fixed part 131 slides along the first direction X. The second driving member is connected to the fourth end 1644, and drives the fourth end 1644 to slide along the first direction X. The fixed part 131 and the moving part 132 may be both provided with a third slideway 136, and the third slideway 136 extends along the first direction X. The first end 1631 and the fourth end 1644 may be slidably connected to the third slideway 136. When the fourth end 1644 moves along the direction from the rotating member 110 to the planar support member 130 (i.e. Fig.10 When the first connecting rod 163 and the second connecting rod 164 rotate around the connecting axis, the first end 1631 is driven to move along the direction from the rotating member 110 to the planar support member 130 (i.e. Fig.10 The distance between the first end 1631 and the fourth end 1644 increases, and the distance between the second end 1632 and the third end 1643 increases. The first connecting rod 163 and the second connecting rod 164 drive the moving part 132 away from the fixed part 131, thereby increasing the distance between the moving part 132 and the fixed part 131. When the fourth end 1644 moves in the direction from the planar support member 130 to the rotating member 110 (i.e., in the direction of the planar support member 130 to the rotating member 110), the distance between the first end 1631 and the fourth end 1644 increases. Fig.10 When the first connecting rod 163 and the second connecting rod 164 rotate around the connecting axis, the first end 1631 is driven to move along the direction from the planar support member 130 to the rotating member 110 (i.e., in the direction opposite to the direction c in FIG. 1 ). Fig.10 The distance between the first end 1631 and the fourth end 1644 is reduced, and the distance between the second end 1632 and the third end 1643 is reduced. The first connecting rod 163 and the second connecting rod 164 drive the moving part 132 to approach the fixed part 131, thereby reducing the distance between the moving part 132 and the fixed part 131. Alternatively, the second driving member is connected to the first end 1631, and its principle is similar to that of the second driving member being connected to the fourth end 1644, which will not be repeated. When there are multiple second driving members in the lifting assembly 160, different second driving members can be connected to the first end 1631 and the fourth end 1644, respectively. The principle has been explained and will not be repeated.

[0174] In other examples, the second end 1632 connected to the fixed portion 131 slides along the first direction X, and the third end 1643 connected to the movable portion 132 slides along the first direction X. The second driving member is connected to the second end 1632, or the second driving member is connected to the third end 1643. When there are multiple second driving members in the lifting assembly 160, different second driving members can be connected to the second end 1632 and the third end 1643, respectively, and the principle has been described and will not be repeated.

[0175] In some other examples, the first end 1631 connected to the moving part 132 slides along the first direction X, and the fourth end 1644 connected to the fixed part 131 slides along the first direction X; at the same time, the second end 1632 connected to the fixed part 131 slides along the first direction X, and the third end 1643 connected to the moving part 132 slides along the first direction X. There are multiple second driving members, and different second driving members can drive the first end 1631 and the fourth end 1644 to move along the first direction X, and the second end 1632 and the third end 1643 to move along the first direction X, so that the distance between the moving part 132 and the fixed part 131 can be adjusted more quickly.

[0176] For example, the second driving member may be a micro motor. The orthographic projection of the second driving member on the flexible screen 210 may be located at the non-bending portion 210b ( Figure 5 The second driving member may be disposed on the moving portion 132, or the second driving member may be disposed on the fixing portion 131, or the second driving member may be disposed on other structural members such as the housing 220. Alternatively, the orthographic projection of the second driving member on the flexible screen 210 may also be located at the bending portion 210a ( Figure 5 ).

[0177] Exemplarily, the lifting assembly 160 may further include a first linkage 166 and a second linkage 167, wherein the first linkage 166 extends along the first direction X and is movably arranged along the first direction X. The first linkage 166 may be a rack, and the second linkage 167 may be a gear, wherein the rack and the gear are meshed. The first linkage 166 is connected to the first connecting rod 163 or the second connecting rod 164. Taking the connection between the first linkage 166 and the fourth end 1644 as an example, the second driving member is connected to the second linkage 167, and the second driving member drives the second linkage 167 to rotate, so as to drive the first linkage 166 to move along the first direction X, and the first linkage 166 drives the fourth end 1644 to move along the first direction X, so as to realize that the first connecting rod 163 and the second connecting rod 164 drive the moving part 132 to approach or move away from the fixed part 131, thereby realizing that the lifting assembly 160 adjusts the distance between the moving part 132 and the fixed part 131. Among them, the positive projection of the second driving member on the flexible screen 210 is located at the bending part 210a ( Figure 5), the two second linkage members 167 in two adjacent lifting assemblies 160 can mesh with each other, so that the two second driving members in the two adjacent lifting assemblies 160 can be combined into the same second driving member, and the second driving member drives one of the second linkage members 167 to rotate, so as to drive the other second linkage member 167 to rotate, thereby simplifying the structure of the foldable support device 100. Of course, the first linkage member 166 and the second linkage member 167 can be threadedly matched to drive the first linkage member 166 to move along the first direction X, and its principle has been explained and will not be repeated.

[0178] In some embodiments, Fig.19 As shown, the moving portion 132 may include a first extension section 132a and a second extension section 132b connected to each other, the first extension section 132a is located on the side of the second extension section 132b away from the corresponding rotating member 110, and the second extension section 132b is located between the first extension section 132a and the rotating member 110. The first extension section 132a is used to be connected to the flexible screen 210, and the second extension section 132b may not be connected to the flexible screen 210. The first extension section 132a and the second extension section 132b are connected through the first elastic member 171. During the bending process of the flexible screen 210, the bending portion 210a is subjected to the force of the first extension section 132a, and the bending portion 210a has a reaction force on the first extension section 132a. The first elastic member 171 can be deformed so that a buffer space is provided between the first extension segment 132a and the second extension segment 132b. The reaction force can drive the first extension segment 132a to move closer to or away from the second extension segment 132b, so as to alleviate the force exerted by the first extension segment 132a on the bending portion 210a, thereby avoiding the phenomenon of stress concentration caused by the first extension segment 132a pulling or squeezing the flexible screen 210 during the folding process, thereby alleviating the crease of the bending portion 210a and improving the service life of the flexible screen 210.

[0179] Among them, the second extension section 132b can be movably connected to the connecting member 140, and the lifting component 160 can be connected to the second extension section 132b. The second extension section 132b moves closer to or away from the fixed part 131 under the action of the lifting component 160, and drives the first extension section 132a to move synchronously along the thickness direction of the planar support member 130 through the first elastic member 171, so as to achieve the purpose of adjusting the distance between the movable part 132 and the fixed part 131.

[0180] Exemplarily, along the first direction X, the extension length of the first extension segment 132a is greater than the extension length of the second extension segment 132b, so that the connection area between the first extension segment 132a and the flexible screen 210 can be larger, so that the connection stability between the flexible screen 210 and the movable part 132 is higher.

[0181] The following combination Figure 20-23Example 1 Sa1, Example 2 Sa2, and Example 3 Sa3 are described.

[0182] Example 1: The first distance in Sa1 ( Fig.11 ab) is the first preset value, and the second distance ( Fig.11 t1-t2) is the second preset value, and the third distance ( Fig.11 In example 2, the first distance in Sa2 is 0.4 mm greater than the first preset value, the second distance is 0.2 mm less than the second preset value, and the third distance is 0.2 mm less than the third preset value. In example 3, the first distance in Sa3 is 0.4 mm less than the first preset value, the second distance is 0.2 mm greater than the second preset value, and the third distance is 0.2 mm greater than the third preset value. Fig. 20 It can be seen that the crease widths of Sa1, Sa2, and Sa3 are all 18.1mm, and the maximum crease depths of Sa1, Sa2, and Sa3 are approximately 114.2μm, 118.7μm, and 109.9μm, respectively. The crease depth of the flexible screen is Sa3<Sa1<Sa2. The crease depth of the flexible screen of Sa3 is improved by about 4% compared with the crease depth of the flexible screen of Sa1, and the crease depth of the flexible screen of Sa1 is improved by about 4% compared with the crease depth of the flexible screen of Sa2. The improvement effect is quite obvious. Fig.21 It can be seen that the maximum values ​​of the first-order derivatives of the crease depths of Sa1, Sa2, and Sa3 are approximately 19.6, 20.5, and 18.9, respectively, and the first-order derivative of the crease depth (i.e., the slope change rate of the crease) is Sa3<Sa1<Sa2. In summary, by reducing the first distance and increasing the second distance and the third distance, the crease depth and the slope change rate of the crease of the flexible screen can be alleviated, thereby alleviating the crease of the flexible screen. Among them, the area between -10mm-10mm can refer to the bending part of the flexible screen.

[0183] in, Fig. 22 and Fig.23 In the embodiment, the time period of 0S-1S is when the bending portion switches from the flattened state to the folded state, and the time period of 1S-2S is when the bending portion switches from the folded state to the flattened state. Fig. 22 It can be seen that the elongation of each film layer (such as polarizer) in the flexible screens of Sa1, Sa2, and Sa3 is Sa3<Sa1<Sa2. Fig.23 It can be seen that the pressure on the glue layer between each film layer in the flexible screens of Sa1, Sa2, and Sa3 is roughly the same. In summary, by reducing the first distance and increasing the second distance and the third distance, the force on each film layer of the bending part can be alleviated without affecting the force on the glue layer between each film layer.

[0184] It should be noted here that the numerical values ​​and numerical ranges involved in the embodiments of the present application are approximate values. Due to the influence of the manufacturing process, there may be a certain range of errors, which can be considered negligible by those skilled in the art.

[0185] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A foldable support device, characterized in that: The foldable support device comprises: Two rotating members are arranged adjacent to each other along a first direction, the two rotating members rotate synchronously, and the rotating members have a rotation center; Two support members are arranged on both sides of the two rotating members along the first direction, the two support members are respectively connected to the two rotating members, and the rotating members drive the support members to move; Wherein, during the folding process of the foldable support device, the distance between the rotation centers of the two synchronously rotating members tends to decrease; the support member comprises a fixed portion and a movable portion arranged along the thickness direction of the foldable support device, the movable portion is connected to the rotating member, the fixed portion and the movable portion are movably connected, the movable portion is movable relative to the fixed portion, and the movable portion has a support surface on a side away from the fixed portion; During the folding process of the foldable support device, the distance between the fixed portion and the movable portion along the thickness direction of the foldable support device gradually decreases; The rotating member is an involute gear; the two rotating members rotating synchronously are meshed with each other; The foldable support device also includes an assembly part, which is provided with two first slideways spaced apart along the first direction, and the first slideways extend obliquely along the thickness direction of the foldable support device. The rotating member is provided with a first slider, and the first slider is correspondingly slidably connected with the first slideway.

2. The foldable support device according to claim 1, characterized in that: During the folding process of the foldable supporting device, the distance between the rotation centers of the two synchronously rotating members gradually decreases.

3. The foldable support device according to claim 1, characterized in that: The supporting member is movably connected to the rotating member.

4. The foldable support device according to claim 3, characterized in that: The foldable support device further comprises a connecting member, through which the support member and the rotating member are movably connected, and the connecting member comprises a first connecting end connected to the rotating member and a second connecting end connected to the support member; The support member is provided with a second slideway, and the second connecting end is slidably connected to the second slideway; A second elastic member is disposed between the inner wall surface of the second slideway and the second connecting end.

5. The foldable support device according to claim 4, characterized in that: The second connecting end is provided with a second slider, and the second slider is slidably connected to the second slideway; A second elastic member is arranged between the inner wall surface of the second slideway and the second sliding block.

6. The foldable support device according to claim 1, characterized in that: The support member is a planar support member.

7. The foldable support device according to claim 6, characterized in that: The moving part comprises a first extension section and a second extension section connected to each other, the second extension section is connected to the rotating member, and the first extension section and the second extension section are connected via a first elastic member; Along the arrangement direction of the first extension section and the second extension section, the extension length of the first extension section is greater than the extension length of the second extension section.

8. The foldable support device according to claim 6, characterized in that: The foldable support device further comprises a lifting assembly, wherein the lifting assembly is disposed between the fixed portion and the movable portion and is used to adjust the distance between the fixed portion and the movable portion along the thickness direction of the foldable support device; Along the thickness direction of the foldable support device, the distance between the rotation center and the fixing portion is greater than or equal to the distance between the support surface and the fixing portion; Half of the distance between the rotation centers of the two synchronously rotating rotating members is a first value, and along the thickness direction of the foldable support device, the distance between the rotation center and the fixed part minus the distance between the support surface and the fixed part is a second value. During the folding process of the foldable support device, the sum of the first value and the second value is the same.

9. The foldable support device according to claim 8, characterized in that: The lifting assembly includes a first lifting member, a second lifting member and a first driving member, the first driving member is connected to the first lifting member, the first lifting member cooperates with the second lifting member, one of the first lifting member and the second lifting member is connected to the fixed part, and the other of the first lifting member and the second lifting member is connected to the moving part to drive the moving part to approach or move away from the fixed part; The first lifting member and the second lifting member are matched with each other through threads, or the first lifting member and the second lifting member are matched with each other through a tooth structure.

10. The foldable support device according to claim 9, characterized in that: The first lifting member is provided with a through hole, the hole wall of the through hole has an internal thread, the second lifting member is inserted into the through hole and its outer wall has an external thread, the internal thread and the external thread are meshed, and the first driving member is used to drive the first lifting member to rotate.

11. The foldable support device according to claim 9, characterized in that: The first lifting member is a gear, the second lifting member is a rack, the gear and the rack are meshed, and the first driving member is used to drive the first lifting member to rotate.

12. The foldable support device according to claim 9, characterized in that: The second lifting member is connected to the fixed part, the first lifting member is connected to the moving part, and the first driving member drives the first lifting member so that the first lifting member drives the moving part to approach or move away from the fixed part.

13. The foldable support device according to claim 8, characterized in that: The lifting assembly includes a first connecting rod, a second connecting rod and a second driving member, the first connecting rod and the second connecting rod are rotatably connected, the first end of the first connecting rod is connected to the moving part, the second end of the first connecting rod is connected to the fixed part, the third end of the second connecting rod is connected to the moving part, and the fourth end of the second connecting rod is connected to the fixed part; The second driving member is connected to at least one of the first connecting rod and the second connecting rod, and the first connecting rod and the second connecting rod drive the moving part to approach or move away from the fixed part; The lifting assembly further includes a first linkage member and a second linkage member, wherein the first linkage member is connected to the first connecting rod or the second connecting rod, the second linkage member cooperates with the first linkage member, the second linkage member is connected to the second driving member, and the second driving member is used to drive the second linkage member to move; The first linkage member is a rack, the second linkage member is a gear, the rack is meshed with the gear, and the second driving member is used to drive the gear to rotate.

14. A foldable display device, characterized in that: The foldable display device comprises a flexible screen and a foldable supporting device as described in any one of claims 1 to 13, wherein the foldable supporting device is used to support the flexible screen.

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