Flexible display module and flexible display device

Abstract

The application discloses a flexible display module and a flexible display device. The flexible display module comprises a flexible display screen and a folding device. The flexible display screen is used for displaying information and comprises a light-out surface. The flexible display screen comprises a bending area. The folding device is arranged on the side of the flexible display screen away from the light-out surface and is used for weakening the creases formed by the bending of the flexible display screen. The folding device comprises a following support layer and a swelling and shrinking component. The following support layer is arranged corresponding to the bending area of the flexible display screen and is used for following the bending and flattening movement of the bending area of the flexible display screen. The swelling and shrinking component is used for supporting the bending area of the flexible display screen. In the application, the swelling and shrinking component can provide support for the bending area when the flexible display screen is flattened, so as to eliminate the creases in the flattened state of the flexible display screen.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a flexible display module and a flexible display device. BACKGROUND

[0002] At present, the flexible display device has become the focus of the public. Due to some technical obstacles of the flexible display module and the complexity of the hinge structure, the flexible display screen cannot autonomously offset the concave caused in the bending state during the opening and closing process. Thus, in the flat state, the bending area of the flexible display device has obvious creases. This greatly reduces the user experience of consumers and also limits the market of the flexible display device.

[0003] Therefore, it is urgent to improve the original flexible display module to solve the problem of obvious creases in the bending area of the flexible display device in the flat state. SUMMARY

[0004] The present application mainly provides a flexible display module and a flexible display device. By adding a folding device in the flexible display module, and the folding device can be folded and flattened with the flexible display module, the obvious creases in the bending area of the flexible display device in the flat state can be effectively eliminated.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is to provide a flexible display module, which comprises a flexible display screen and a folding device, wherein the flexible display screen is used for displaying information and comprises a light-out surface, and the flexible display screen comprises a bending area; the folding device is arranged on the side of the flexible display screen away from the light-out surface and is used for weakening the creases formed by the bending of the flexible display screen; the folding device comprises a follow-up support layer and a swelling and shrinking component, wherein the follow-up support layer is arranged correspondingly to the bending area of the flexible display screen and is used for bending and flattening with the bending area of the flexible display screen; and the swelling and shrinking component is used for supporting the bending area of the flexible display screen.

[0006] In an embodiment, the flexible display screen further comprises a folding area, which is separated from the bending area; the folding device further comprises a plurality of folding parts, which are arranged in layers with the folding area and are connected with the swelling and shrinking component, and are used for providing a movement range for the swelling and shrinking component.

[0007] Preferably, the number of the folding parts is the same as the number of the folding areas, one more than the number of the bending areas, and one more than the number of the swelling and shrinking components.

[0008] Preferably, the number of the folding parts is 2, the number of the folding areas is 2, the number of the bending areas is 1, and the number of the swelling and shrinking components is 1.

[0009] In an embodiment, the following support layer generates a monitoring signal related to the motion state of the flexible display screen; the folding device further comprises a controller for receiving the monitoring signal outputted by the following support layer, and controlling the expansion and contraction of the expansion-contraction assembly according to the monitoring signal.

[0010] Preferably, the folding device further comprises an adjusting assembly connected with the folding part and the controller, for bending and flattening the flexible display screen under the action of the controller.

[0011] The adjusting assembly comprises a plurality of stress elbow members and a plurality of stress connecting members, which are connected to each other, for smoothing the bending process of the flexible display screen.

[0012] Preferably, the folding device further comprises a stabilizing shaft member rigidly connected with the expansion-contraction assembly, for maintaining the stability of the flexible display module in the bending and flattening states.

[0013] In an embodiment, the following support layer comprises a first adhesive layer, a stress tracking layer and a protective layer, wherein the first adhesive layer is used for bonding with the flexible display screen; the stress tracking layer is arranged on the side of the first adhesive layer away from the flexible display screen, and contains one or more of stress detection particles or reflective particles, for transmitting stress signals and / or light signals as monitoring signals to the controller; the protective layer is arranged on the side of the stress tracking layer away from the first adhesive layer, for protecting the stress tracking layer.

[0014] In an embodiment, the expansion-contraction assembly comprises a pressure control assembly for adjusting the air pressure in the expansion-contraction assembly; the pressure control assembly comprises a pressure control unit, a pressure adjusting member, and a pressure pump, wherein the pressure control unit is coupled with the controller, for receiving the control signal sent by the controller and controlling the air pressure in the expansion-contraction assembly; the pressure adjusting member is connected with the expansion-contraction assembly, for adjusting the air pressure in the expansion-contraction assembly; the pressure pump is connected with the pressure control unit, for delivering corresponding air pressure to the expansion-contraction assembly.

[0015] In an embodiment, the pressure control unit comprises a positive pressure control unit and a negative pressure control unit, wherein the positive pressure control unit is used for receiving the control signal sent by the controller, and delivering positive pressure to the expansion-contraction assembly; the negative pressure control unit is used for receiving the control signal sent by the controller, and delivering negative pressure to the expansion-contraction assembly.

[0016] Preferably, the pressure adjusting member comprises a positive pressure adjusting member and a negative pressure adjusting member; wherein the positive pressure adjusting member is connected with the expansion-contraction bag in the expansion-contraction assembly, for controlling the expansion of the expansion-contraction bag; the negative pressure adjusting member is connected with the expansion-contraction bag in the expansion-contraction assembly, for controlling the contraction of the expansion-contraction bag.

[0017] Preferably, the number of negative pressure adjusting members is two, which are respectively located on both sides of the expansion-contraction bag.

[0018] Preferably, the pressure pump comprises a positive pressure pump and a negative pressure pump, wherein the positive pressure pump adjusts the pressure supply in the positive pressure adjusting member according to the signal of the positive pressure control unit; the negative pressure pump adjusts the pressure supply in the negative pressure adjusting member according to the signal of the negative pressure control unit.

[0019] In an embodiment, the expansion and contraction assembly further comprises a connecting pair for connecting the expansion and contraction assembly and the folding part, the connecting pair comprising a first connecting pair and a second connecting pair. The first connecting pair is located on the side of the expansion and contraction assembly close to one of the folding parts, and is hinged to the folding part to move with the folding part; the second connecting pair is located on the side of the expansion and contraction assembly close to the other folding part, and is hinged to the folding part to move with the folding part.

[0020] In an embodiment, the folding device further comprises a connecting assembly for establishing the connection between the expansion and contraction assembly and the stabilizing shaft, the connecting assembly comprising a connecting rod, a first supporting rod and a second supporting rod. The connecting rod connects the first connecting pair and the second connecting pair, and passes through the expansion and contraction bag of the expansion and contraction assembly; one end of the first supporting rod is connected to the first connecting pair, and the other end is connected to the stabilizing shaft; the first supporting rod is used for stably supporting the connecting rod. One end of the second supporting rod is connected to the second connecting pair, and the other end is connected to the stabilizing shaft; the second supporting rod is used for stably supporting the connecting rod.

[0021] Preferably, the connecting rod, the first supporting rod and the second supporting rod form a triangular structure.

[0022] In an embodiment, the expansion and contraction assembly further comprises an arc modulation assembly for changing the height according to the expansion and contraction of the expansion and contraction assembly, and adjusting the arc of the expansion and contraction bag to meet the use requirements; the arc modulation assembly comprises a stabilizing member, a sail supporting rod and an arc modulation member. The connecting rod passes through the stabilizing member, and the stabilizing member is used for maintaining the overall stability of the arc modulation assembly; the sail supporting rods are respectively located on the two sides of the stabilizing member, and extend to the two sides away from the connecting rod; the arc modulation member is fixed on the sail supporting rods, and is used for adjusting the height of the sail supporting rods and / or the arc of the arc modulation assembly.

[0023] Preferably, the arc modulation component comprises a support, a first rotating rotor, a second rotating rotor, a first sail rope and a second sail rope, wherein the support is fixed on the sail support rod; the first rotating rotor is located on one side of the support in the extension direction of the sail support rod; the second rotating rotor is located on the other side of the support in the extension direction of the sail support rod; one end of the first sail rope is connected with the first rotating rotor, and the other end is connected with the arc modulation surface of the arc modulation component; one end of the second sail rope is connected with the second rotating rotor, and the other end is connected with the arc modulation surface of the arc modulation component. The first rotating rotor can control the corresponding arc of the arc modulation surface connected with the first sail rope by controlling the tightening or loosening of the first sail rope; the second rotating rotor can control the corresponding arc of the arc modulation surface connected with the second sail rope by controlling the tightening or loosening of the second sail rope.

[0024] Preferably, the arc modulation component further comprises a stress collection component connected with the arc modulation surface, for monitoring the stress in the expansion and contraction component and controlling the arc of the arc modulation surface formed by the arc modulation component.

[0025] To solve the above technical problems, another technical solution adopted by the present application is to provide a flexible display device, which comprises the flexible display module and a housing, wherein the flexible display module is arranged on the housing.

[0026] The beneficial effects of the present application are: by adding the folding device in the flexible display module, the combination of the follow-up support layer, the expansion and contraction component and the controller is applied in the folding device, and the folding device can be folded and flattened together with the flexible display module, which can effectively eliminate the obvious creases existing in the bending area of the flexible display device in the flattened state. Specifically, the follow-up support layer is connected with the flexible display screen and is used to bend and flatten the flexible display screen and generate a monitoring signal related to the motion state of the flexible display screen; the expansion and contraction component is used to support the bending area of the flexible display screen; the controller is used to receive the monitoring signal output by the follow-up support layer and control the expansion and contraction of the expansion and contraction component. In the flattened state of the flexible display module, the follow-up support layer detects the flattened state signal of the flexible display module and transmits it to the controller, and the controller controls the expansion of the expansion and contraction component. After the expansion and contraction component is expanded, it can effectively support the bending area and eliminate the obvious creases existing in the bending area of the flexible display module in the flattened state. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor. Among them:

[0028] Figure 1 This is a schematic diagram of the structure of an embodiment of the flexible display module in this application;

[0029] Figure 2 This is a schematic diagram of the structure of one embodiment of the adjustment component in this application;

[0030] Figure 3 This is a schematic diagram of one embodiment of the follower support layer in this application;

[0031] Figure 4 This is a schematic diagram of the structure of an embodiment of the expansion and contraction component in this application;

[0032] Figure 5 This is a schematic diagram of the structure of one embodiment of the connecting component in this application;

[0033] Figure 6 This is a structural schematic diagram of an embodiment of the flexible display module in the bent state according to this application;

[0034] Figure 7 This is a schematic diagram of one embodiment of the arc modulation component in this application.

[0035] Explanation of reference numerals in the attached drawings: 1 Flexible display screen; 11 Bending area; 12 Folding area; 13 Folding part; 2 Follow-up support layer; 21 First adhesive layer; 22 Stress tracking layer; 23 Protective layer; 3 Expansion / shrinkage assembly; 31 Pressure control assembly; 32 Pressure control unit; 321 Positive pressure control unit; 322 Negative pressure control unit; 33 Pressure regulating component; 331 Positive pressure regulating component; 332 Negative pressure regulating component; 34 Pressure pump; 341 Positive pressure pump; 342 Negative pressure pump; 36 Negative pressure flexible pipeline; 37 Positive pressure flexible pipeline ; 35 Connecting pair; 351 First connecting pair; 352 Second connecting pair; 38 Support part; 39 Expansion / shrink package; 4 Controller; 5 Adjustment assembly; 51 Stress elbow; 52 Stress connector; 6 Connecting assembly; 61 Connecting rod; 62 First support rod; 63 Second support rod; 7 Stabilizing shaft; 8 Curvature modulation assembly; 81 Stabilizer; 82 Sail support rod; 83 Curvature modulation component; 84 Curvature modulation surface; 85 Support component; 86 First rotating rotor; 87 Second rotating rotor; 88 First sail cable; 89 Second sail cable. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," "having" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items.

[0038] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0039] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0041] Please refer to Figure 1 The present application provides a flexible display module, which comprises a flexible display screen 1 and a folding device, wherein the flexible display screen 1 is used for displaying information and comprises a light-out surface, the flexible display screen 1 comprises a bending area 11, the bending area 11 can be bent to support the bending and flattening movement of the flexible display screen 1; the folding device is arranged on the side of the flexible display screen 1 away from the light-out surface, and is used for weakening the crease formed by the bending of the flexible display screen 1; the folding device comprises a following support layer 2 and a swelling and shrinking assembly 3, wherein the following support layer 2 is arranged corresponding to the bending area 11 of the flexible display screen 1, and is used for following the bending and flattening movement of the bending area 11 of the flexible display screen 1, and the swelling and shrinking assembly 3 is used for supporting the bending area 11 of the flexible display screen 1.

[0042] Specifically, the folding device is arranged on the side away from the light-out surface of the flexible display screen 1, at this time the folding device does not affect the normal display of the flexible display module, and meanwhile the folding device weakens the effect of the crease formed by the bending of the flexible display screen 1. In an embodiment, the folding device can be placed in the functional layer of the flexible display module, and the folding device and the functional layer are designed as an integrated structure, which is beneficial to the stability of the placement of the folding device, and meanwhile the folding device does not interfere with the work of each functional layer in the flexible display module, facilitating large-scale application.

[0043] In an embodiment, by adding the folding device in the flexible display module, the folding device is combined with the follow-up support layer 2 and the expansion and contraction assembly 3, and the folding device can be folded and flattened together with the flexible display module, which can effectively eliminate the obvious crease in the bending area 11 in the flattened state of the flexible display device.

[0044] Please continue to refer to Figure 1 , the flexible display screen 1 further comprises folding areas 12, the folding areas 12 are spaced apart by the bending area 11; the folding device further comprises a plurality of folding portions 13, the plurality of folding portions 13 are arranged in layers with the folding areas 12 and are connected with the expansion and contraction assembly 3, for providing a movement range for the expansion and contraction assembly 3. When the bending area 11 of the flexible display screen 1 is bent, the two folding areas 12 connected with the bending area 11 gradually approach each other from the original state of being far away. When the flexible display screen 1 is flattened, the two folding areas 12 connected with the bending area 11 gradually move away and finally are on the same plane. The folding portions 13 in the folding device are arranged in layers with the folding areas 12 of the flexible display screen 1, and the folding portions 13 move together with the folding areas 12. Specifically, when the folding areas 12 of the flexible display screen 1 approach each other, the folding portions 13 of the folding device also approach each other; when the folding areas 12 of the flexible display screen 1 move away from each other, the folding portions 13 of the folding device also move away from each other. When the folding portions 13 drive the folding areas 12 to move, the folding portions 13 can drive the expansion and contraction assembly 3 to deform due to the connection between the folding portions 13 and the expansion and contraction assembly 3. Meanwhile, the expansion and contraction assembly 3 can expand when the flexible display screen 1 is unfolded and can shrink when the flexible display screen 1 is bent. Meanwhile, the folding portions 13 provide a movement range for the expansion and contraction assembly 3, in the folded state of the flexible display screen 1, the two folding portions 13 located on both sides of the bending area 11 are in the closest state between the contact surfaces of the folding areas 12, at this time, the expansion and contraction assembly 3 also shrinks to the smallest form; in the flattened state of the flexible display screen 1, the two folding portions 13 located on both sides of the bending area 11 are in the closest state between the side edges connected with the expansion and contraction assembly 3, at this time, the expansion and contraction assembly 3 also expands to the largest form; therefore, the folding portions 13 provide a movement range for the expansion and contraction assembly 3.

[0045] In one embodiment, the number of folded portions 13 is the same as the number of folded areas 12, one more than the number of bending areas 11, and one more than the number of expansion and contraction components 3. The folded portions 13 and folded areas 12 are stacked and correspond one-to-one. Of course, multiple folded portions 13 can be provided for one folded area 12, with the orthographic projection of the multiple folded portions 13 onto the folded area 12 located within the folded area 12. Since the folded areas 12 are separated by bending areas 11, the number of folded areas 12 is one more than the number of bending areas 11, and therefore the number of folded portions 13 is also one more than the number of bending areas 11. The expansion and contraction components 3 are correspondingly provided to the bending areas 11, so the number of expansion and contraction components 3 is the same as the number of bending areas 11, allowing the expansion and contraction components 3 to effectively support the bending areas 11 when the flexible display panel is unfolded; simultaneously, the number of folded portions 13 is one more than the number of bending areas 11, resulting in the number of folded portions 13 being one more than the number of expansion and contraction components 3.

[0046] Please continue reading. Figure 1 ,exist Figure 1 In the illustrated embodiment, there are two folding portions 13, two folding areas 12, one bending area 11, and one expansion / contraction component 3. Figure 1 The flexible display screen 1 shown has only one bending area 11, which is a single-fold structure. In the single-fold flexible display screen 1, there are two folding areas 12. Correspondingly, the number of folding parts 13 is set to 2, and the number of expansion and contraction components 3 is set to 1, the same as the number of bending areas 11. In other folding structures of the flexible display screen 1, such as a double-fold structure, the flexible display screen 1 has two bending areas 11 and three folding areas 12. Correspondingly, three folding parts 13 and two expansion and contraction components 3 can be set. Through the above-mentioned corresponding settings, the expansion and contraction components 3 can effectively support all bending areas 11 in the flexible display module, eliminating the crease problem in any bending area 11 of the flexible display module.

[0047] Please continue reading. Figure 1, the follow-up support layer 2 can generate a monitoring signal related to the motion state of the flexible display screen 1; meanwhile, the folding device can further comprise a controller 4, which is configured to receive the monitoring signal output by the follow-up support layer 2 and control the expansion and contraction of the expansion-contraction assembly 3 according to the monitoring signal. Specifically, the follow-up support layer 2 is arranged corresponding to the bending area 11 of the flexible display screen 1, and is configured to follow the bending and flattening motion of the flexible display screen 1 and generate a monitoring signal related to the motion state of the flexible display screen 1; the expansion-contraction assembly 3 is configured to support the bending area 11 of the flexible display screen 1; and the controller 4 is configured to receive the monitoring signal output by the follow-up support layer 2 and control the expansion and contraction of the expansion-contraction assembly 3 according to the monitoring signal. In the flattened state of the flexible display module, the follow-up support layer 2 detects the flattened state signal of the flexible display module and transmits it to the controller 4, and the controller 4 controls the expansion-contraction assembly 3 to expand, and after the expansion-contraction assembly 3 expands, it can effectively support the bending area 11, eliminating the obvious creases existing in the bending area 11 in the flattened state of the flexible display module.

[0048] Please continue to refer to Figure 2 The folding device can further comprise an adjusting assembly 5 connected with the folding part 13 and connected with the controller 4, and configured to bend and flatten with the flexible display screen 1 under the action of the controller 4. The adjusting assembly 5 comprises a plurality of stress elbow pieces 51 and a plurality of stress connecting pieces 52, the stress elbow pieces 51 and the stress connecting pieces 52 are connected, and are configured to make the bending process of the flexible display screen 1 smooth.

[0049] Specifically, the adjusting assembly 5 is hinged with the folding part 13, and the adjusting assembly 5 comprises a twisting piece located at both ends of the adjusting assembly 5, and is configured to realize the hinge between the adjusting assembly 5 and the folding part 13. Due to the hinge between the two ends of the adjusting assembly 5 and the folding part 13, when the folding part 13 bends and flattens with the flexible display screen 1, the adjusting assembly 5 also shortens and lengthens with the flexible display screen 1 in the same regularity. The adjusting assembly 5 comprises a plurality of stress elbow pieces 51 and a plurality of stress connecting pieces 52, the stress elbow pieces 51 and the stress connecting pieces 52 are connected, wherein the stress elbow piece 51 is arc-shaped, and the curvature of the stress elbow piece 51 changes in the stretching and contracting process. When the overall length of the adjusting assembly 5 shortens, the corresponding curvature of the stress elbow piece 51 decreases; when the overall length of the adjusting assembly 5 increases, the corresponding curvature of the stress elbow piece 51 increases. Meanwhile, the two ends of the stress elbow piece 51 are respectively connected with different stress connecting pieces 52, and the two ends of the stress connecting piece 52 are respectively connected with different stress elbow pieces 51. In the initial state, i.e. the unfolded state of the flexible display screen 1, the stress connecting pieces 52 are arranged in parallel; and the two ends of the stress connecting piece 52 are respectively connected with different stress elbow pieces 51, and the stress elbow pieces 51 connected with the same stress connecting piece 52 are arranged in parallel, so that the adjusting assembly 5 extends in a bent shape.

[0050] In an embodiment, the stress elbow member 51 and the stress connecting member 52 are connected with the controller 4, and under the action of the controller 4, the stress elbow member 51 and the stress connecting member 52 adjust the posture with the posture change of the flexible display screen 1. The stress elbow member 51 is flexible, and the curvature of the stress elbow member 51 can change under the control of the controller 4. The stress elbow member 51 is made of one or more of nickel-titanium alloy, phosphor bronze, beryllium bronze, and manganese steel. The stress connecting member 52 is connected with a control line, so that the controller 4 can control the movement of the stress elbow member 51. In an embodiment, the controller 4 controls the posture change of the adjusting assembly 5 according to the monitoring signal output by the follow-up support layer 2. When the flexible display screen 1 is bent, the follow-up support layer 2 detects the bending signal of the flexible display screen 1 and transmits the signal to the controller 4. The controller 4 controls the adjusting assembly 5 to adjust the posture. Under the control of the controller 4, the curvature of the stress elbow member 51 increases, so that the length of the adjusting assembly 5 increases to adapt to the state of the flexible display screen 1. When the flexible display screen 1 is unfolded, the follow-up support layer 2 detects the unfolding signal of the flexible display screen 1 and transmits the signal to the controller 4. The controller 4 controls the adjusting assembly 5 to adjust the posture. Under the control of the controller 4, the curvature of the stress elbow member 51 decreases, so that the length of the adjusting assembly 5 decreases to adapt to the state of the flexible display screen 1. Through the control of the control area on the stress elbow member 51 in the adjusting assembly 5, the bending process of the flexible display module is smooth and the damping is appropriate.

[0051] In an embodiment, the stress elbow member 51 can be made of temperature memory metal material, which can present different postures at different temperatures. When the temperature of the environment where the stress elbow member 51 is located changes, the curvature of the stress elbow member 51 also changes. Specifically, one end of the stress elbow member 51 is connected with a heat source electric control assembly, and the heat source electric control assembly is connected with the controller 4 through the control line in the stress connecting member 52. When the flexible display screen 1 is bent or unfolded, the controller processes the movement signal and transmits the signal to the heat source electric control assembly. Specifically, when the flexible display screen 1 is bent, the controller processes the movement signal and transmits the signal to the heat source electric control assembly. The heat source electric control assembly increases the temperature of the stress elbow member 51, so that the curvature of the stress elbow member 51 increases, and the length of the adjusting assembly 5 gradually increases during the bending process of the flexible display screen 1. When the flexible display screen 1 is unfolded, the controller processes the movement signal and transmits the signal to the heat source electric control assembly. The heat source electric control assembly decreases the temperature of the stress elbow member 51, so that the curvature of the stress elbow member 51 decreases, and the length of the adjusting assembly 5 gradually decreases during the unfolding process of the flexible display screen 1. Through the control of the controller, the length of the adjusting assembly 5 can change with the posture of the flexible display screen 1, so that the bending and unfolding process of the flexible display module is smooth, and the user has a better use experience.

[0052] Please continue to refer to Figure 1The folding device may further include a stabilizing shaft 7, which is rigidly connected to the expansion and contraction assembly 3 to maintain the stability of the flexible display module in bending and flattening states. The stabilizing shaft 7 is arranged parallel to the two folding portions 13 and located in the region between the two folding portions 13. In one embodiment, the stabilizing shaft 7 is located at the middle position in the region between the two folding portions 13, ensuring the stability of the folding device as it bends and flattens with the flexible display screen 1.

[0053] Please see Figure 3 The follow-up support layer 2 may include a first adhesive layer 21, a stress tracking layer 22, and a protective layer 23. The first adhesive layer 21 is used to bond to the flexible display screen 1. The stress tracking layer 22 is stacked on the side of the first adhesive layer 21 facing away from the flexible display screen 1 and contains one or more stress-detecting particles or reflective particles, used to transmit stress signals and / or light signals as monitoring signals to the controller 4. The protective layer 23 is stacked on the side of the stress tracking layer 22 facing away from the first adhesive layer 21 and is used to protect the stress tracking layer 22. Simultaneously, the side of the protective layer 23 facing away from the stress tracking layer 22 can be bonded to the expansion / contraction component 3.

[0054] Specifically, the follow-up support layer 2 is bonded to the flexible display screen 1. Specifically, the first adhesive layer 21 in the follow-up support layer 2 is bonded to the flexible display screen 1, serving to fix the relative position between the follow-up support layer 2 and the flexible display screen 1. When the posture of the flexible display screen 1 changes, the posture of the follow-up support layer 2 also changes accordingly. Simultaneously, patterned silver nanowires are doped into the first adhesive layer 21, making it more resistant to bending and improving its lifespan. Furthermore, a stress tracking layer 22 is provided on the side of the first adhesive layer 21 facing away from the flexible display screen 1. The stress tracking layer 22 contains one or more of stress-detecting particles or reflective particles, used to transmit stress signals and / or light signals as monitoring signals to the controller 4. Specifically, by observing the changes in the stress-detecting particles and / or reflective particles in the stress tracking layer 22, the bending or flattening posture of the flexible display screen 1 is calculated through fitting, allowing the controller 4 to control the expansion and contraction component 3 to expand and contract to dynamically follow the changes in the flexible display screen 1. For example, when the controller 4 receives a signal that the flexible display screen 1 is bending, the expansion and contraction component 3 shrinks; when the controller 4 receives a signal that the flexible display screen 1 is flattening, the expansion and contraction component 3 expands. A protective layer 23 is provided on the side of the stress tracking layer 22 facing away from the first adhesive layer 21, and the side of the protective layer 23 facing away from the stress tracking layer 22 can be bonded to the expansion and contraction component 3. In one embodiment, a flexible particle receiving unit is embedded inside the second adhesive layer.

[0055] Please see Figure 4The expansion and contraction assembly 3 comprises a pressure control assembly 31 for adjusting the air pressure in the expansion and contraction assembly 3. The pressure control assembly 31 comprises a pressure control unit 32, a pressure adjusting member 33 and a pressure pump 34. The pressure control unit 32 is coupled to the controller 4 to receive the control signal sent by the controller 4 and control the air pressure in the expansion and contraction assembly 3. The pressure adjusting member 33 is connected to the expansion and contraction assembly 3 to adjust the air pressure in the expansion and contraction assembly 3. The pressure pump 34 is connected to the pressure control unit 32 to deliver corresponding air pressure to the expansion and contraction assembly 3. By connecting the pressure control assembly 31 to the controller 4, the pressure control assembly 31 can timely control and adjust the air pressure in the expansion and contraction assembly 3 according to the signal of the controller 4, so that the posture change of the expansion and contraction assembly 3 can be timely adjusted according to the posture change of the flexible display module.

[0056] In an embodiment, the pressure control unit 32 comprises a positive pressure control unit 321 and a negative pressure control unit 322. The positive pressure control unit 321 is configured to receive the control signal sent by the controller 4 and deliver positive pressure to the expansion and contraction assembly 3. The negative pressure control unit 322 is configured to receive the control signal sent by the controller 4 and deliver negative pressure to the expansion and contraction assembly 3. When the pressure control unit 32 comprises the positive pressure control unit 321 and the negative pressure control unit 322, the implementation of positive pressure and negative pressure is realized by different control units, which is conducive to the accuracy of control. In an embodiment, the pressure control unit 32 can control both positive pressure and negative pressure at the same time, which improves the integration of the expansion and contraction assembly 3 and is conducive to reducing the volume of the expansion and contraction assembly 3.

[0057] In an embodiment, the pressure adjusting member 33 comprises a positive pressure adjusting member 331 and a negative pressure adjusting member 332. The positive pressure adjusting member 331 is connected to the expansion and contraction bag 39 in the expansion and contraction assembly 3 to control the expansion of the expansion and contraction bag 39. The negative pressure adjusting member 332 is connected to the expansion and contraction bag 39 in the expansion and contraction assembly 3 to control the contraction of the expansion and contraction bag 39. Specifically, the positive pressure adjusting member 331 comprises a positive pressure cavity, a positive pressure relief valve, a stabilizer, etc. The positive pressure adjusting member 331 is connected to the expansion and contraction bag 39 through a positive pressure transmission flexible pipeline. A flow detection unit and / or a pressure detection unit can be arranged at the end of the positive pressure transmission flexible pipeline connected to the expansion and contraction bag 39 to detect the flow or pressure delivered by the positive pressure adjusting member 331 to the expansion and contraction bag 39, and also to detect the flow or pressure in the expansion and contraction bag 39. By using the combination of the positive pressure cavity, the positive pressure relief valve and the stabilizer in the positive pressure adjusting member 331, the expansion and contraction bag 39 can be expanded at a desired rate, and the expansion and contraction bag 39 can be stably controlled.

[0058] Specifically, the negative pressure adjusting member 332 comprises a negative pressure cavity, a negative pressure relief valve, a stabilizer, etc. The negative pressure adjusting member 332 is connected to the inflatable bag 39 through a negative pressure transmission flexible pipeline. A flow detection unit and / or a pressure detection unit can be arranged at the end of the negative pressure transmission flexible pipeline connected to the inflatable bag 39, so as to detect the flow or pressure transmitted by the negative pressure adjusting member 332 to the inflatable bag 39, and also to detect the flow or pressure in the inflatable bag 39. Through the combined use of the negative pressure cavity, the negative pressure relief valve, and the stabilizer in the negative pressure adjusting member 332, the inflatable bag 39 can be shrunk at a required rate, and stable control of the inflatable bag 39 can be achieved.

[0059] Please continue to refer to Figure 4 The number of negative pressure adjusting members 332 is two, which are respectively located on the two sides of the inflatable bag 39. Specifically, the inflatable assembly 3 further comprises a support part 38, which can effectively support the constituent parts in the inflatable assembly 3. The support part 38 is arranged in parallel with the two folding parts 13 in the region between the two folding parts 13, and the support part 38 has rigidity and its shape remains stable. The support part 38 has a main body part parallel to the folding part 13, and the two side positions of the main body part have protruding parts in the direction away from the support part 38 of the inflatable bag 39. The protruding part and the main body part can be an integral structure. In an embodiment, the negative pressure adjusting member 332 is placed adjacent to the position where the protruding part is located, so that the support part 38 provides effective support for the two negative pressure adjusting members 332. At this time, the negative pressure adjusting member 332 is located at the position of the inflatable bag 39 close to the two side folding parts 13, and the two side negative pressure adjusting members 332 are connected to the inflatable bag 39 through negative pressure transmission flexible pipelines, which is conducive to effective control of the inflatable bag 39. At the same time, the parts of the inflatable bag 39 close to the two side folding parts 13 can expand or shrink at the same rate, so that the folding device provides the same support to the regions on both sides of the bending area 11 of the flexible display screen 1. When the flexible display screen 1 is bent and flattened, the support effect of the inflatable assembly 3 on the bending area 11 is better, and thus the display effect of the flexible display module is better.

[0060] In an embodiment, the pressure pump 34 comprises a positive pressure pump 341 and a negative pressure pump 342, wherein the positive pressure pump 341 adjusts the pressure supply in the positive pressure adjusting member 331 according to the signal of the positive pressure control unit 321, and the negative pressure pump 342 adjusts the pressure supply in the negative pressure adjusting member 332 according to the signal of the negative pressure control unit 322. The pressure pump 34 provides the pressure source for the pressure adjusting member 33, specifically, the positive pressure pump 341 provides the positive pressure source for the positive pressure adjusting member 331, and the negative pressure pump 342 provides the negative pressure source for the negative pressure adjusting member 332. When the positive pressure pump 341 is in operation, the positive pressure source is provided for the positive pressure adjusting member 331, so that the expansion bag 39 in the expansion and contraction assembly 3 is inflated; when the negative pressure pump 342 is in operation, the negative pressure source is provided for the negative pressure adjusting member 332, so that the expansion bag 39 in the expansion and contraction assembly 3 is deflated.

[0061] Please continue to refer to Figure 4 The expansion and contraction assembly 3 further comprises a connecting pair 35 for connecting the expansion and contraction assembly 3 and the folding part 13, and the connecting pair 35 comprises a first connecting pair 351 and a second connecting pair 352. The first connecting pair 351 is located on the side of the expansion and contraction assembly 3 close to one of the folding parts 13, and is hinged to the folding part 13 to move with the folding part 13; the second connecting pair 352 is located on the side of the expansion and contraction assembly 3 close to the other folding part 13, and is hinged to the folding part 13 to move with the folding part 13. The first connecting pair 351 and the second connecting pair 352 are both hinged to the folding part 13, so that when the folding part 13 moves, the first connecting pair 351 and the second connecting pair 352 will also move, and the shape of the expansion and contraction assembly 3 will change with the change of the posture of the folding part 13. When the flexible display screen 1 is bent, the folding parts 13 move close to each other, and the horizontal distance between the first connecting pair 351 and the second connecting pair 352 remains unchanged, at this time the expansion bag 39 in the expansion and contraction assembly 3 is deflated; when the flexible display screen 1 is unfolded, the folding parts 13 move away from each other, and the horizontal distance between the first connecting pair 351 and the second connecting pair 352 remains unchanged, at this time the expansion bag 39 in the expansion and contraction assembly 3 is inflated, and the expansion bag 39 is symmetric about the connecting line between the first connecting pair 351 and the second connecting pair 352.

[0062] Please refer to Figure 5, the folding device further comprises a connecting assembly 6 for establishing the connection between the expansion assembly 3 and the stabilizing shaft 7, the connecting assembly 6 comprises a connecting rod 61, a first supporting rod 62 and a second supporting rod 63. Wherein, the connecting rod 61 connects the first connecting pair 351 and the second connecting pair 352, and passes through the expansion bag 39 of the expansion assembly 3; one end of the first supporting rod 62 is connected with the first connecting pair 351, and the other end is connected with the stabilizing shaft 7; for stabilizing and supporting the connecting rod 61. One end of the second supporting rod 63 is connected with the second connecting pair 352, and the other end is connected with the stabilizing shaft 7; for stabilizing and supporting the connecting rod 61. The material of the connecting rod 61 is one or more of flexible polycarbonate, polytetrafluoroethylene and polyurethane, so as to realize the adjustment of the hardness and the driven bending amplitude of the connecting rod 61, and stabilize the connection between the connecting rod 61 and the first connecting pair 351 and the second connecting pair 352. One end of the first supporting rod 62 and the second supporting rod 63 is connected with the stabilizing shaft 7. The other end is connected with the first connecting pair 351 and the second connecting pair 352 respectively, and at the same time, the first supporting rod 62 and the second supporting rod 63 have rigidity, which can provide effective support for the connecting rod 61 and the expansion assembly 3. The material of the first supporting rod 62 and the second supporting rod 63 can be one or more of stainless steel SUS, titanium alloy and aluminum magnesium alloy, which can realize the fixed support and stabilization of the expansion assembly 3; the included angle between the first supporting rod 62 and the second supporting rod 63 can be adjusted according to the folding size and other parameters of the flexible display screen 1, and optionally, the angle range can be 30°-120°.

[0063] Please continue to refer to Figure 5 , specifically, the connecting rod 61 has flexibility, one end of the connecting rod 61 is connected with the first connecting pair 351, and the other end is connected with the second connecting pair 352, and at the same time, the first connecting pair 351 and the second connecting pair 352 are respectively hinged with different folding parts 13, and the twisting angle range thereof is preferably 0°-90°+arctan(LA / LB), see Figure 6 When the flexible display module is bent, an included angle a is formed between the folding area 12 and the symmetry axis of the flexible display module, wherein LA is the long side length of the bending angle a, and LB is the short side length of the bending angle a. The twisting angle between the first connecting pair 351 and the second connecting pair 352 and the different folding parts 13 can be calculated by the above formula.

[0064] Please continue to refer to Figure 5 , the connecting rod 61, the first supporting rod 62 and the second supporting rod 63 form a triangular structure. Wherein, the connecting rod 61, the first supporting rod 62 and the second supporting rod 63 are sequentially connected end to end to form a triangular structure, which has certain stability, so that the connecting assembly 6 establishes the stable connection between the expansion assembly 3 and the stabilizing shaft 7.

[0065] Please refer to Figure 4 and Figure 7, the expansion and contraction assembly 3 further comprises an arc modulation assembly 8 for changing height according to the expansion and contraction of the expansion and contraction assembly 3, and adjusting the arc of the expansion and contraction bag 39 to meet the use requirements; the arc modulation assembly 8 comprises a stabilizing piece 81, sail support rods 82 and an arc modulation piece 83, wherein the connecting rod 61 passes through the stabilizing piece 81, and the stabilizing piece 81 is used for maintaining the overall stability of the arc modulation assembly 8; the sail support rods 82 are respectively located at two side positions of the stabilizing piece 81 and extend to two side directions away from the connecting rod 61; and the arc modulation piece 83 is fixed on the sail support rods 82 and is used for adjusting the height of the sail support rods 82 and / or the arc of the arc modulation assembly 8. Specifically, the stabilizing piece 81 has an opening, so that the connecting rod 61 passes through the stabilizing piece 81, the connecting rod 61 and the stabilizing piece 81 are in transition or interference fit, the relative vertical relationship between the central axis of the stabilizing piece 81 and the connecting rod 61 can be realized, and the connecting rod 61 has a certain supporting effect on the stabilizing piece 81 in the second direction. In addition, the second direction and the first direction are perpendicular in the direction of the illustration, the first direction is parallel to the connecting rod 61, and the second direction is perpendicular to the connecting rod 61. The stabilizing piece 81 is used for maintaining the overall stability of the arc modulation assembly 8. In the second direction, the sail support rods 82 are respectively located at two side positions of the stabilizing piece 81 and extend to two side directions away from the connecting rod 61; and the arc modulation piece 83 is fixed on the sail support rods 82 and is used for adjusting the height of the sail support rods 82 and / or the arc of the arc modulation assembly 8. The sail support rods can be fixed length or variable length, and the support of the sail or the adjustment of the maximum height can be realized. When the sail support rods 82 are fixed length, only the arc of the arc modulation piece 83 needs to be controlled when the posture of the flexible display screen 1 changes, and the arc modulation assembly 8 can adjust the arc of the part of the expansion and contraction assembly 3 in contact with it. When the sail support rods 82 are variable length, the length of the sail support rods 82 and the arc of the arc modulation piece 83 are adjusted when the posture of the flexible display screen 1 changes, so that the change of the arc modulation assembly 8 matches the change of the posture of the flexible display screen 1. The arc modulation assembly 8 can realize the relaxation amplitude value near the customized point or point linkage of the expansion and contraction bag 39 by adjusting the arc of the end part thereof.

[0066] Please continue to see Figure 7The arc modulation member 83 comprises a support 85, a first rotating rotor 86, a second rotating rotor 87, a first sail cable 88 and a second sail cable 89, wherein the support 85 is fixed on the sail support rod 82; the first rotating rotor 86 is located on one side of the support 85 in the extending direction of the sail support rod 82; the second rotating rotor 87 is located on the other side of the support 85 in the extending direction of the sail support rod 82; one end of the first sail cable 88 is connected with the first rotating rotor 86, and the other end is connected with the arc modulation surface 84 of the arc modulation member 83; one end of the second sail cable 89 is connected with the second rotating rotor 87, and the other end is connected with the arc modulation surface 84 of the arc modulation member 83. The first rotating rotor 86 can control the corresponding arc of the arc modulation surface 84 connected with the first sail cable 88 by controlling the tightening or loosening of the first sail cable 88; the second rotating rotor 87 can control the corresponding arc of the arc modulation surface 84 connected with the second sail cable 89 by controlling the tightening or loosening of the second sail cable 89.

[0067] In an embodiment, the first rotating rotor 86 and the second rotating rotor 87 are placed on both sides of the support 85 in the extending direction of the sail support rod 82, and the first rotating rotor 86 and the second rotating rotor 87 are respectively connected with the arc modulation surface 84 on both sides of the support 85 in the second direction through the first sail cable 88 and the second sail cable 89, so that the arc modulation member 83 has a symmetrical structure. In actual use, the tightening or loosening of the first sail cable 88 and the second sail cable 89 by the first rotating rotor 86 and / or the second rotating rotor 87 can realize the arc adjustment of the corresponding ends of the first sail cable 88 and the second sail cable 89. When the first rotating rotor 86 and the second rotating rotor 87 tighten the first sail cable 88 and the second sail cable 89, the arc of the corresponding ends of the first sail cable 88 and the second sail cable 89 can be reduced; when the first rotating rotor 86 and the second rotating rotor 87 loosen the first sail cable 88 and the second sail cable 89, the arc of the corresponding ends of the first sail cable 88 and the second sail cable 89 can be increased. In actual use, the first rotating rotor 86 can be controlled to tighten or loosen the first sail cable 88 alone, the second rotating rotor 87 can be controlled to tighten or loosen the second sail cable 89 alone, or the first rotating rotor 86 and the second rotating rotor 87 can be controlled to tighten or loosen the first sail cable 88 and the second sail cable 89 simultaneously. The first sail cable 88 and the second sail cable 89 are hinged with the arc modulation surface 84, so that the arc change of the arc modulation surface 84 is smooth.

[0068] In an embodiment, the arc modulation assembly 8 further comprises a stress collection member connected with the arc modulation surface 84, for monitoring the stress in the expansion assembly 3 and controlling the arc of the arc modulation surface 84 formed by the arc modulation member. The stress collection member can be embedded in the arc modulation surface 84, and the depth of embedding of the stress collection member in the arc modulation surface 84 can be designed according to the size / hardness / elasticity and other parameters of the arc modulation surface 84. In addition, the material of the arc modulation surface 84 can be silicone rubber or variable hardness silicone rubber doped with control sub-wires, and the material of the control sub-wires can be one or more of polyamide, aromatic polyamide, polyester, and yarn, so that the elasticity range of the arc modulation surface 84 can be adjusted. The surface of the arc modulation surface 84 can be coated with an anti-static wear-resistant coating, so that the surface roughness of the arc modulation surface 84 is in the range of 0.01-0.35. In addition, the arc modulation surface 84 and the inner surface of the expansion bag 39 can be in weakly adhesive contact.

[0069] In actual use, multiple arc modulation assemblies 8 can be used according to actual use needs. In an embodiment, three arc modulation assemblies 8 are included in one expansion assembly 3, the central axis of one of the arc modulation assemblies 8 coincides with the central axis of the expansion bag 39, and the other two arc modulation assemblies 8 are located on both sides of the arc modulation assembly 8, so that the arc modulation assemblies 8 can provide effective support for the expansion bag 39. In addition, multiple arc modulation members 83 can be included in the same arc modulation assembly 8. In an embodiment, four arc modulation members 83 are included in the arc modulation assembly 8, and the four arc modulation members 83 are respectively located on both sides of the stabilizing member 81 in the first direction and can be placed two by two. When the arc modulation members 83 are symmetrically arranged about the first direction in which the stabilizing member 81 is located, it is beneficial to achieve balanced arrangement of the arc modulation assembly 8 and improve the stability of the arc modulation assembly 8 during operation. Of course, in another embodiment, two arc modulation members 83 can be included in the arc modulation assembly 8, and the two arc modulation members 83 are respectively located on both sides of the stabilizing member 81, so that the arc modulation assembly 8 has the function of adjusting the arc of the corresponding position of the expansion bag 39.

[0070] Please refer to Figure 6 During the bending process of the flexible display screen 1, the servo support layer 2 detects the shape of the flexible display screen 1 and transmits the bending signal to the controller 4, the controller 4 controls the negative pressure control unit 322 to start working, so that the negative pressure pressure pump 342 starts working, the negative pressure adjusting member 332 is connected with the expansion bag 39 through the negative pressure flexible pipeline 36, so that the expansion bag 39 shrinks, and at the same time the controller 4 controls the adjusting assembly 5 to start working, corresponding adjustment of the stretching posture is made, so that the arc of the stress elbow member 51 increases, and smooth bending of the flexible screen body with low stress is realized.

[0071] Please continue to refer to Figure 1In the flattening process of the flexible display screen 1, the servo support layer 2 detects the shape of the flexible display screen 1 and transmits a flattening signal to the controller 4, the controller 4 controls the positive pressure control unit 321 to start working, so that the positive pressure pump 341 starts working, the positive pressure adjusting piece 331 is connected with the expansion bag 39 through the positive pressure flexible pipeline 37, so that the expansion bag 39 is inflated, and the curvature adjusting assembly 5 adjusts the height of the sail support rod 82 and the curvature of the curvature adjusting surface 84. At the same time, the controller 4 controls the adjusting assembly 5 to start working, adjusts the contraction posture correspondingly, so that the curvature of the stress elbow piece 51 is reduced, and the crease is invisible in the flattening process of the flexible display screen 1. The overall response time is controllable and settable, so as to improve the use experience of the user, and further improve the use experience and service life of the flexible display device.

[0072] The application also provides a flexible display device, which comprises the flexible display module and a shell, and the flexible display module is arranged on the shell. The flexible display device in the embodiment of the application can be any product or component with display function, such as electronic paper, mobile phone, tablet computer, television, display, notebook computer, digital photo frame or navigator.

[0073] The above description is only the embodiment of the application, and does not limit the patent scope of the application. Any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields is also included in the patent protection scope of the application.

Claims

1. A flexible display module, characterized in that, The application relates to a flexible display module. The flexible display module comprises a flexible display screen for displaying information and comprising a light-out surface, and a folding device arranged on the side of the flexible display screen away from the light-out surface and used for weakening the creases formed by the bending of the flexible display screen. The folding device comprises: a following support layer arranged corresponding to the bending area of the flexible display screen and used for following the bending and flattening movement of the bending area of the flexible display screen; an expansion and contraction assembly used for supporting the bending area of the flexible display screen; a stability shaft rigidly connected with the expansion and contraction assembly and used for maintaining the stability of the flexible display module in the bending and flattening states; a plurality of folding parts connected with the expansion and contraction assembly and used for providing the movement range of the expansion and contraction assembly. The expansion and contraction assembly comprises: a pressure control assembly used for adjusting the air pressure in the expansion and contraction assembly, and the pressure control assembly comprises: a pressure adjusting part connected with the expansion and contraction assembly and used for adjusting the air pressure in the expansion and contraction assembly, and the pressure adjusting part further comprises: a positive pressure adjusting part connected with the expansion bag in the expansion and contraction assembly and used for controlling the expansion of the expansion bag; a negative pressure adjusting part connected with the expansion bag in the expansion and contraction assembly and used for controlling the contraction of the expansion bag. The expansion and contraction assembly further comprises: a connecting pair used for connecting the expansion and contraction assembly and the folding parts, and the connecting pair comprises: a first connecting pair located on the side of the expansion and contraction assembly close to one of the folding parts; a second connecting pair located on the side of the expansion and contraction assembly close to the other folding part. The folding device further comprises: a connecting assembly used for establishing the connection between the expansion and contraction assembly and the stability shaft, and the connecting assembly comprises: a connecting rod connecting the first connecting pair and the second connecting pair and penetrating through the expansion bag of the expansion and contraction assembly. The expansion and contraction assembly further comprises: an arc modulation assembly used for changing the height according to the expansion and contraction of the expansion and contraction assembly, adjusting the arc of the expansion bag to meet the use requirements, and the arc modulation assembly comprises: a stabilizing part through which the connecting rod penetrates and used for maintaining the overall stability of the arc modulation assembly; a sail supporting rod respectively located on the two sides of the stabilizing part and extending to the two sides away from the connecting rod; an arc modulation part fixed on the sail supporting rod and used for adjusting the height of the sail supporting rod and / or the arc of the arc modulation assembly. The flexible display screen further comprises a folding area separated from the bending area.

2. The flexible display module of claim 1, wherein, The folding device further comprises: a plurality of folding parts arranged in layers with the folding area. The number of the folding parts is one more than the number of the bending area and one more than the number of the expansion and contraction assembly.

3. The flexible display module of claim 2, wherein, The number of the folding parts is two, the number of the folding area is two, the number of the bending area is one, and the number of the expansion and contraction assembly is one.

4. The flexible display module of claim 3, wherein, The following support layer generates a monitoring signal related to the movement state of the flexible display screen, and the folding device further comprises: 5.The flexible display module of claim 4, wherein, a controller used for receiving the monitoring signal output by the following support layer and controlling the expansion and contraction of the expansion and contraction assembly according to the monitoring signal. The folding device further comprises:

6. The flexible display module of claim 5, wherein, ​ An adjusting assembly is connected with the folding part and the controller, and is used for bending and flattening the flexible display screen under the action of the controller; The adjusting assembly comprises a plurality of stress elbow members and a plurality of stress connecting members, which are connected to make the bending process of the flexible display screen smooth.

7. The flexible display module of claim 5, wherein, The following layer comprises: A first adhesive layer is used for bonding with the flexible display screen; A stress tracking layer is arranged on the side of the first adhesive layer away from the flexible display screen, and contains one or more of stress detection particles or reflective particles, and is used for transmitting stress signals and / or light signals as the monitoring signals to the controller; A protective layer is arranged on the side of the stress tracking layer away from the first adhesive layer, and is used for protecting the stress tracking layer.

8. The flexible display module according to any one of claims 5-7, wherein The pressure control assembly further comprises: A pressure control unit is coupled with the controller, and is used for receiving the control signal sent by the controller and controlling the air pressure in the expansion and contraction assembly; A pressure pump is connected with the pressure control unit, and is used for transmitting corresponding air pressure to the expansion and contraction assembly. 9.The flexible display module of claim 8, wherein, The pressure control unit comprises: A positive pressure control unit is used for receiving the control signal sent by the controller and delivering positive pressure to the expansion and contraction assembly; A negative pressure control unit is used for receiving the control signal sent by the controller and delivering negative pressure to the expansion and contraction assembly. 10.The flexible display module of claim 9, wherein, The number of the negative pressure adjusting members is two, and they are respectively located on the two sides of the expansion and contraction bag.

11. The flexible display module of claim 10, wherein, The pressure pump comprises: A positive pressure pump adjusts the pressure supply in the positive pressure adjusting member according to the signal of the positive pressure control unit; A negative pressure pump adjusts the pressure supply in the negative pressure adjusting member according to the signal of the negative pressure control unit.

12. The flexible display module according to claim 6, wherein The first connecting pair is hinged with the folding part and moves with the folding part; The second connecting pair is hinged with the folding part and moves with the folding part.

13. The flexible display module of claim 12, wherein, The folding device further comprises: A first support rod is connected with the first connecting pair at one end and is connected with the stability shaft member at the other end, and is used for stably supporting the connecting rod; A second support rod is connected with the second connecting pair at one end and is connected with the stability shaft member at the other end, and is used for stably supporting the connecting rod.

14. The flexible display module of claim 13, wherein, The connecting rod and the first support rod and the second support rod form a triangular structure.

15. The flexible display module of claim 1, wherein, The arc modulation member comprises: A support member is fixed on the sail support rod; A first rotating rotor is located on one side of the support member in the extension direction of the sail support rod; A second rotating rotor is located on the other side of the support member in the extension direction of the sail support rod; A first sail rope is connected with the first rotating rotor at one end and is connected with the arc modulation surface of the arc modulation member at the other end, A second sail rope is connected with the second rotating rotor at one end and is connected with the arc modulation surface of the arc modulation member at the other end, The first rotating rotor can control the corresponding arc of the arc modulation surface part connected with the first sail rope by controlling the tightening or loosening of the first sail rope.

16. The flexible display module of claim 15, wherein, The arc modulation assembly further comprises: A stress collecting member connected with the arc modulation surface for monitoring the stress in the expansion and contraction assembly and controlling the arc of the arc modulation surface formed by the arc modulation member.

17. A flexible display device, comprising: Comprise: The flexible display module according to any one of claims 1-16; And; A shell, wherein the flexible display module is arranged on the shell.

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