WO2020037507A1

WO2020037507A1 - Electronic device and flexible display device thereof

Info

Publication number: WO2020037507A1
Application number: PCT/CN2018/101592
Authority: WO
Inventors: 陈松亚; 杨松龄
Original assignee: 深圳市柔宇科技有限公司
Priority date: 2018-08-21
Filing date: 2018-08-21
Publication date: 2020-02-27
Also published as: CN112639925A

Abstract

A flexible display device (30) of an electronic device (100). The electronic device (100) comprises a housing (20) and the flexible display device (30), the housing (20) comprising a first frame (21), a second frame (23), and hinges (25); the flexible display device (30) is disposed on the first frame (21), the second frame (23), and the hinges (25), and the flexible display device (30) comprises a flexible screen (32); a front surface of the flexible screen (32) is a display plane, the flexible screen (32) comprises a bendable area (31), and a rear surface of the flexible screen (32) is provided with a buffer mechanism (34); the buffer mechanism comprises a buffer layer (344) corresponding to the bendable area (31), the buffer layer (344) being compressed when the flexible screen (32) is bent such that the flexible screen (32) approaches or is located on a neutral layer of the flexible display device (30).

Description

Electronic device and its flexible display device

Technical field

The present application relates to the field of display devices of electronic devices, and in particular, to a flexible display device and an electronic device provided with the flexible display device.

Background technique

With the development of flexible screens, electronic devices for folding display screens have appeared in the prior art. In order to support the flexible screen, the whole surface of the flexible screen is generally attached to a metal plate. However, when the flexible screen is bent, the metal plate will generate a large tensile stress on the flexible screen, which may easily cause damage to the flexible screen and affect the function of the flexible screen.

Summary of the Invention

The present application provides a flexible display device capable of preventing damage to a flexible screen, and an electronic device provided with the flexible display device.

A flexible display device provided by the present application includes a flexible screen. The front of the flexible screen is a display surface. The flexible screen includes a bendable area. The back of the flexible screen is provided with a buffer mechanism. The buffer layer in the bendable area. When the flexible screen is bent, the buffer layer is compressed so that the flexible screen is close to or located on the neutral layer of the flexible display device.

The present application also provides a flexible display device, including a flexible screen and a buffer layer. The buffer layer is close to and supports the flexible screen. When the flexible screen is bent, the buffer layer is compressed to reduce the extent that the flexible screen is stretched.

The present application also provides an electronic device including a casing and a flexible display device. The casing includes a first frame body, a second frame body, and a first frame body connected between the first frame body and the second frame body. A hinge, and the flexible display device is disposed on the first frame body, the second frame body, and the hinge. The flexible display device includes a flexible screen, a front surface of the flexible screen is a display surface, the flexible screen includes a bendable area, a buffer mechanism is provided on the back of the flexible screen, and the buffer mechanism includes a corresponding flexible area. When the flexible screen is bent, the buffer layer is compressed so that the flexible screen is close to or located on the neutral layer of the flexible display device.

The back of the flexible screen of the electronic device of the present application is provided with a buffer mechanism, the buffer mechanism includes a buffer layer corresponding to the bendable area. When the flexible screen is bent, the buffer layer is compressed to bring the flexible screen close to or located in the flexible display device. The flexible layer makes less stress on the flexible screen to prevent bending stress from damaging the screen body layer of the flexible screen, improves the bending resistance of the screen body layer, and can compensate the flexible display device during bending. The length change caused by the difference between the inner and outer radii during the process to prevent bending stress from damaging the flexible screen.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can obtain other drawings according to the drawings without paying creative labor.

FIG. 1 is a schematic three-dimensional structure diagram of an electronic device in a first embodiment of the present application.

FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1.

FIG. 3 is a partial schematic diagram of the front structure of the electronic device in the first embodiment of the present application.

FIG. 4 is a schematic diagram of a bent state of the electronic device according to the first embodiment of the present application.

FIG. 5 is a partial cross-sectional structural diagram of an electronic device in a second embodiment of the present application.

FIG. 6 is a partial cross-sectional structure diagram of an electronic device in a third embodiment of the present application.

FIG. 7 is a schematic structural diagram of a front portion of an electronic device in a fourth embodiment of the present application.

FIG. 8 is a schematic structural diagram of a front portion of an electronic device in a fifth embodiment of the present application.

FIG. 9 is a schematic structural diagram of a front portion of an electronic device in a sixth embodiment of the present application.

detailed description

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be understood that the orientations or positional relationships indicated by the terms “up”, “down”, “left”, and “right” are based on the orientations or positional relationships shown in the drawings, and are for convenience only. The description of the present invention and simplified description do not imply or indicate that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

In the description of the embodiment of the present invention, it should be understood that the orientation or positional relationship indicated by the terms “thickness” and the like is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than suggesting The device or element referred to or indicated must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

Please refer to FIG. 1 to FIG. 3 together. FIG. 1 is a schematic view of the three-dimensional structure of the electronic device in the first embodiment of the present application; FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1; A partial schematic view of the front structure of the electronic device in the example. The electronic device 100 in the first embodiment of the present application includes a casing 20 and a flexible display device 30 disposed on the casing 20. The casing 20 includes a first frame 21, a second frame 23, and a hinge 25 connected between the first frame 21 and the second frame 23. The flexible display device 30 is disposed on the first frame body 21, the second frame body 23 and the hinge 25. The flexible display device 30 is provided with a bendable area 31 corresponding to the hinge 25 and a non-bendable area connected to the bendable area 31. The flexible display device 30 includes a flexible screen 32 and a buffer mechanism 34. The flexible screen 32 includes a screen body layer 322, and the screen body layer 322 is a main body for displaying an image. The buffer mechanism 34 is disposed on the back of the flexible screen 32 corresponding to the bendable area 31. The buffering mechanism 34 includes a buffering layer 344 disposed on the back of the flexible screen 32. The buffering layer 344 is elastic, and can be elastically deformed when pressed by an external force. The equivalent elastic modulus of the buffer layer 344 is lower than the elastic modulus of the flexible screen 32. The buffer mechanism 34 is used for the flexible display device 30 to compensate the length of the bendable area 31, that is, when the flexible display device 30 is bent along the bendable area 31, the flexible screen 32 will compress the buffer layer 344, causing the buffer layer 344 to elastically deform and become thinner to compensate for the length change caused by the difference between the inner and outer radius of the flexible display device 30 itself, thereby reducing the impact on the flexible screen 32. The bending internal stress can prevent the flexible screen 32 from being damaged. In addition, since the equivalent elastic modulus of the buffer layer 344 is lower than that of the flexible screen 32, when the flexible display device is bent, the neutral layer of the flexible display module 30 faces the direction of the flexible screen 32 compared to the neutral layer before bending. When moving, that is, when flexing, the neutral layer of the flexible display module 30 will be close to or on the flexible screen 32, so that the tensile stress on the flexible screen 32 is reduced or even eliminated. In addition, the buffer mechanism 34 further includes a protective sheet 342 disposed on the back surface of the buffer layer 344. The protective sheet 342 is located between the back of the flexible screen 32 and the hinge 25. Therefore, the protective sheet 342 can protect the flexible screen 32 itself and the laminated material layer on the back thereof to prevent the flexible screen 32 The area corresponding to the bendable area 31 and the laminated material layer is worn. The front surface of the flexible screen 32 is a display surface, that is, the front surface of the flexible screen 32 refers to a light emitting surface of the flexible screen 32; the back surface of the flexible screen 32 refers to a surface facing away from the light emitting surface.

The protection sheet 342 is a flexible support sheet, and the protection sheet 342 may be a thin metal sheet such as a copper foil, a liquid metal sheet, a memory alloy sheet, a plastic sheet, or a thin sheet made of other suitable materials. In this embodiment, the protection sheet 342 is a liquid metal sheet.

A gap 345 is provided between the front surface of the protective sheet 342 and the back of the flexible screen 32 corresponding to the bendable area 31. The buffer layer 344 is received in the gap 345 and is attached to the protective sheet 342. And the flexible screen 32. Specifically, the front surface of the buffer layer 344 is fixedly attached to the back of the flexible screen 32, and the back surface of the buffer layer 344 is fixedly attached to the front of the protective sheet 342. The back surface of the protection sheet 342 is attached to the hinge 25. Specifically, the protection sheet 342 is fixed to the front surface of the hinge 25 by welding, snapping or gluing. The back surface of the flexible screen 32 and the second frame body 23 are fixed and adhered corresponding to the non-bent area. When the electronic device 100 is bent through the hinge 25, the protective sheet 342 and the flexible screen 32 are relatively moved and relatively close in an area corresponding to the bendable area 31, and the protective sheet 342 And the flexible screen 32 presses the buffer layer 344 oppositely, so that the buffer layer 344 undergoes elastic deformation and becomes thinner, that is, the thickness of the flexible display device 30 before the bending of the bendable area 31 is greater than that after the bending thickness. When bending, the protective sheet 342 and the flexible screen 32 correspond to the bendable area 31, which compresses the buffer layer 344 to compensate for the length change caused by the difference between the inner and outer radii of the flexible display device 30 itself during bending, thereby It can reduce the damage to the flexible screen 32 caused by the bending internal stress of the flexible screen 32 corresponding to the bendable area 31; In addition, during the bending process of the flexible display device 30, the screen body layer 322 is located at or near the flexible screen 32 The position of the neutral layer of the flexible display device 30 is to improve the bending resistance of the screen body layer 322.

When the electronic device 100 is flattened through the hinge 25, the protective sheet 342 and the flexible screen 32 are relatively moved and relatively far away in an area corresponding to the bendable area 31. The protective sheet 342 and The flexible screen 32 releases the compression of the buffer layer 344, the gap 345 between the front surface of the protective sheet 342 and the back surface of the flexible screen 32 becomes wider, and the buffer layer 344 is elastically reset.

The neutral layer in the present application means that during the bending process of the flexible display device 30, the outer layer of the flexible display device 30 is stretched, and the inner layer of the flexible display device 30 is squeezed. A transition layer that is not stretched or squeezed, the transition layer has little stress, and the transition layer is a neutral layer. The screen body layer 322 in the present application is located at or near the neutral layer when being bent or flattened to improve the bending resistance of the screen body layer 322.

The so-called liquid metal in this application refers to heating the alloy to a molten state, and then cooling it at an ultra-fast cooling rate, so that the alloy crystal lattice is too late to orderly crystallize and solidify, because it is in an amorphous state, like glass, so it is also called It is amorphous alloy, liquid metal or metallic glass. The characteristics of liquid metal are long-range disorder (short-range order), metastable state, isotropic physical properties to a certain extent, no exact melting point, glass transition temperature, etc., and the characteristics of solid, metal, and glass. Under certain conditions, it has high strength, high hardness, plasticity, heat conduction and wear resistance. That is, the liquid metal referred to in the present invention is substantially solid at normal temperature, but some of its characteristics are close to liquid, so it is called liquid metal. The liquid metal may be an alloy material of one or more materials such as copper, titanium, iron, zirconium, silver, nickel, gallium, gold, antimony, cadmium, zinc, indium, silicon and the like. The specific metal is preferably lower Elastic modulus, hardness, elongation and other mechanical properties.

The reason why the liquid metal sheet is selected as the protective sheet 342 in this embodiment is that the liquid metal sheet has better wear resistance. The protection sheet 342 can effectively resist the friction caused by the hinge 25 and is not prone to wear. Liquid metal can be selected from copper-based, titanium-based, iron-based, zirconium-based, silver-based, nickel-based, gallium-based, gold-based, antimony-based, cadmium-based, zinc-based, indium-based, silicon-based and other liquid metals. For existing materials with lower modulus of elasticity, such as silicone, foam, plastic, etc., the strength of liquid metal is higher, and the abrasion resistance is better, which can effectively support flexible screens.

In other embodiments, the protection sheet 342 may also be a flexible plastic support sheet, a flexible rubber support sheet, a thin metal sheet, or a memory alloy sheet. In this embodiment, the electronic device 100 is a mobile phone. It can be understood that, in other embodiments, the electronic device 100 may be, but is not limited to, a PDA of a radio telephone, a pager, a web browser, a notepad, a calendar, and / or a Global Positioning System (GPS) receiver.

A buffer mechanism 34 is provided on the back of the flexible screen 32 of the electronic device 100 of the present application, and the buffer mechanism 34 includes a back buffer layer 344 provided on the flexible screen 32 corresponding to the bendable area 31 and a buffer layer 344 provided on the back. Protective sheet 342 on the back. When the electronic device 100 is bent through the hinge 25, the flexible screen 32 and the protective sheet 342 will be relatively close together at the bendable area 31 to squeeze the buffer layer 344, so that The buffer layer 344 undergoes elastic deformation and becomes thinner, so that the flexible screen 32 is closer to or located on the neutral layer of the flexible display device 30, so that the flexible screen 32 receives less stress, and the screen body layer 322 is improved. The bending resistance of the flexible display device 30 can compensate for the length change caused by the difference between the inner and outer radius of the flexible display device 30 during bending, so as to prevent bending stress from damaging the screen body layer 322 of the flexible screen 32. In addition, due to the protection sheet, 342 is located between the screen body layer 322 and the hinge 25. Therefore, the back of the flexible screen 32 will not be worn during the bending or flattening of the electronic device 100, so the flexibility can be ensured The function of the screen 32 is not affected.

As shown in FIG. 2, an end of the first frame body 21 remote from the second frame body 23 is provided with a guide groove 212, and a slider 214 is slidably disposed in the guide groove 212. An elastic member 216 is disposed between the first frame body 21 and the sliding direction of the slider 214. In this embodiment, the protection sheet 342 is fixed between the first frame body 21 and the second frame body 23. Specifically, one side of the protection sheet 342 is fixed to the second frame body 23. The other side of the protection sheet 342 is fixedly connected to the slider 214 of the first frame body 21. The back of the protective sheet 342 is fixed to the hinge 25 at the bendable area 31. The non-bent area of one end of the flexible screen 32 is fixedly attached to the first frame body 21, and the non-bent area of the other end of the flexible screen 32 is fixedly attached to the second frame body 23. . The buffer layer 344 between the back surface of the flexible screen 32 and the protective sheet 342 can be elastically deformed, which can facilitate the bending and flattening of the flexible display device 30. The elastic member 216 elastically pulls the slider 214 toward an end away from the second frame body 23 to straighten the flexible screen 32 to prevent the electronic device 100 from being bent / flattened. The area of the flexible screen 32 corresponding to the bendable area 31 is separated from the hinge 25 and arched.

In this embodiment, the elastic member 216 is a spring, one end of the spring is connected to the first frame body 21, and the other end of the spring is connected to the slider 214.

The flexible screen 32 further includes a supporting film 324 attached to the back surface of the screen body 322 and a cover plate 326 covering the front surface of the screen body 322. The supporting film 324 is passed through optical glue, UV Adhesives such as glue and adhesive are attached to the back of the flexible screen 32. In this embodiment, the front surface of the support film 324 is fixedly attached to the back of the screen body 322, and the buffer layer 344 is fixedly attached to the back of the support film 324 corresponding to the bendable area 31, and the support One end of the film 324 is fixedly attached to the second frame body 23 corresponding to the non-bent area, and the other end of the support film 324 is fixedly attached to the slider 214 and the second body 23 corresponding to the non-bent area. On the first frame 21.

The supporting film 324 may be a PET film, a PI film, a PC film, or the like.

Optical glue is laminated between the support film 324 and the first frame 21 to make the connection between the flexible screen 32 and the first frame 21 stronger.

The cover plate 326 is a light-transmissive and bending-resistant sheet. In this embodiment, the cover plate 326 is an ultra-thin glass cover sheet, and the thickness of the ultra-thin glass cover sheet is micron.

The reason why the ultra-thin glass cover sheet is used as the cover plate 326 in this embodiment is that the ultra-thin glass cover sheet has advantages such as better bending resistance, high strength, and high hardness. When the ultra-thin glass cover sheet is attached to the screen body layer When the front surface of 322 is in, the ultra-thin glass cover sheet can not only be bent or flattened with the flexible screen 32, but also can effectively resist external objects from scratching the ultra-thin glass cover sheet, and it is not easy to be worn. Secondly, the ultra-thin glass cover sheet has a low modulus of elasticity, which can be directly adhered to the front of the flexible screen 32. When the flexible display device 30 is bent, the flexible display device 30 can be synchronized or stretched along with the flexible screen 32 to avoid flexible display. When the device 30 is bent, it may be damaged due to a large difference in stretching amplitude. On the other hand, the ultra-thin glass cover sheet has a high light transmittance, which facilitates the emission of light from the flexible screen 32. After long-term use, the ultra-thin glass cover sheet does not suffer from aging problems such as discoloration.

In other embodiments, the cover plate 326 may also be a flexible transparent cover plate.

As shown in FIG. 2, the flexible display device 30 further includes two support plates 36. One of the support plates 36 is stacked between the front surface of the first frame body 21 and the back surface of the support film 324. The plate 36 is laminated between the front surface of the second frame body 23 and the back surface of the support film 324. The two supporting plates 36 are used to support the flexible screen 32 on the casing 20. The back surfaces of the two support plates 36 are fixedly attached to the first frame body 21 and the second frame body 23 by means of glue, welding, screw lock, buckle, magnetic attraction, etc., respectively. In this embodiment, each supporting plate 36 is a plastic sheet.

In the embodiment, each supporting plate 36 may also be a rubber sheet, a silicone sheet, or a thin metal sheet.

In this embodiment, two opposite sides of the protective sheet 342 that are parallel to the bending axis of the flexible screen 32 are fixedly connected to the slider 214 and the second frame 23 of the first frame 21 adjacent to the two. On the side of the hinge 25, there is a gap 345 between the support film 324 and the protection sheet 342, so as to accommodate the buffer layer 344. The front surface of the protection sheet 342 is not flush with the front surface of the support plate 36, that is, the front surface of the protection sheet 342 is farther from the back surface of the flexible screen 32 than the front surface of the support plate 36. The bending axis referred to in the present invention is not limited to a solid axis, and may also be a non-solid axis, as long as the flexible screen 32 can be bent around the axis, it can be regarded as a bending axis.

Please refer to FIG. 2 and FIG. 3 together. The buffer layer 344 is a layer or layers with different compression ratios and layers fixed between the protective sheet 342 and the flexible screen 32 corresponding to the bendable area 31. The elasticity of a number of buffers 3442. Specifically, one or more layers of buffer bodies 3442 having different compression ratios and rebound rates are fixed in the gap 345 between the front surface of the protective sheet 342 and the back surface of the flexible screen 32. These buffer bodies 3442 are spaced apart from each other, so that the buffer bodies 3442 are elastically deformed and become thinner when they are squeezed. That is, a gap is formed between the adjacent buffer bodies 3442 as a storage space when the buffer bodies 3442 are deformed. Each buffer body 3442 is a buffer strip made of an elastic material. Specifically, each buffer body 3442 may be at least any one of a silicone rubber strip, a foam plastic strip, a foam strip, or a rubber strip having elasticity.

In this embodiment, the buffer bodies 3442 are arranged along a direction perpendicular to the bending axis of the flexible screen 32, and each buffer body 3442 extends along the direction of the bending axis of the flexible screen 32. The front surface of each buffer body 3442 is fixedly attached to the back surface of the supporting film 324 by using gel or double-sided adhesive, and the back surface of each buffer body 3442 is fixedly attached by the gel or double-sided adhesive on the front surface of the protective sheet 342.

Please refer to FIG. 4, which is a schematic diagram showing a bending state of the electronic device according to the first embodiment of the present application. When the electronic device 100 is used, when the electronic device 100 is bent along the hinge 25, the flexible screen 32 and the protective sheet 342 will be relatively close together and squeezed at the bendable area 31. The buffer layer 344 and the gap 345 become smaller, so that the buffer layer 344 undergoes elastic deformation and becomes thinner, which can compensate for the length change caused by the difference between the inner and outer radius of the flexible display device 30 during bending, and prevent The bending stress damages the screen body layer 322; secondly, during the bending process of the flexible display device 30, the neutral layer of the flexible display device 30 moves upward, so that the screen body layer 322 corresponds to the foldable The curved area 31 is located at the neutral layer position of the flexible display device 30. Therefore, the screen body layer 322 receives less stress, thereby improving the bending resistance of the screen body layer 322 and increasing the flexible screen 32. In addition, the elastic member 216 always keeps pushing against the slider 21 to prevent the area of the flexible screen 32 corresponding to the bendable area 31 from being separated from the hinge 25 and arching.

In other embodiments, the hinge 25 may be omitted, and the buffer mechanism 34 not only has a buffer function, but also supports the flexible screen 32.

Further, the protective sheet 342 can also be omitted. When flexed, the flexible screen 32 can also exert a compression effect on the buffer layer 344 and cause the neutral surface to move.

Please refer to FIG. 5, which is a partial cross-sectional structural diagram of an electronic device in a second embodiment of the present application. The structure of the second embodiment of the electronic device of the present application is similar to that of the first embodiment, except that in the second embodiment, the slider 214 of the first frame body 21 and the second frame body Two opposing latching grooves 202 are defined on the side of the hinge 23 facing the hinge 25. Each latching slot 202 extends in a direction parallel to the bending axis of the flexible screen 32. The two opposite sides of the protection sheet 342 are respectively fixed in the two latching grooves 202, so that the protection sheet 342 is fixed on the housing 20, and the front surface of the protection sheet 342 and the flexibility are fixed. There is a gap 345 between the back surfaces of the screens 32, and the buffer layer 344 is received in the gaps 345 and fixed between the protective sheet 342 and the flexible screen 32.

Please refer to FIG. 6, which is a schematic cross-sectional structural view of a portion of an electronic device according to a third embodiment of the present application. The structure of the third embodiment of the electronic device of the present application is similar to that of the first embodiment, except that in the third embodiment, a connecting groove 362 is provided on the back surface of each support plate 36 adjacent to the hinge 25. The connecting groove 362 passes through the supporting plate 36 and faces the side of the hinge 25, and the connecting groove 362 extends in a direction parallel to the bending axis of the flexible screen 32. The two opposite sides of the protection sheet 342 are fixedly received in the two latching grooves 202 respectively, so that the protection sheet 342 is fixed on the flexible display device 30. The front surface of the protection sheet 342 and the There is a gap 345 between the rear surfaces of the flexible screen 32, and the buffer layer 344 is received in the gap 345 and fixed between the protective sheet 342 and the flexible screen 32.

The buffer mechanism 34 in this embodiment is integrated with the flexible display device 30, which facilitates the overall installation or replacement of the flexible display device 30 to the casing 20 and improves the assembly efficiency.

Please refer to FIG. 7, which is a schematic structural diagram of a front portion of an electronic device in a fourth embodiment of the present application. The structure of the fourth embodiment of the electronic device of the present application is similar to that of the first embodiment, except that in the fourth embodiment, the buffer layer 344 is fixed to the protection sheet 342 and the flexible screen 32. Between several buffers 3442. These buffer bodies 3442 are spaced apart from each other, so that the buffer bodies 3442 are elastically deformed and become thinner when they are squeezed. The buffer bodies 3442 are arranged in a direction parallel to the bending axis of the flexible screen 32. Each buffer body 3442 extends in a direction perpendicular to the bending axis of the flexible screen 32. The length of each buffer body 3442 is shorter than the length of the buffer body 3442. The length of the bendable area 31 in a direction perpendicular to the bending axis of the flexible screen 32.

Please refer to FIG. 8, which is a schematic structural diagram of a front portion of an electronic device in a fifth embodiment of the present application. The structure of the fifth embodiment of the electronic device of the present application is similar to that of the first embodiment, except that in the fifth embodiment, the buffer layer 344 is fixed to the protective sheet 342 and the flexible screen 32. The buffer sheet is provided with a plurality of through holes 3445, and each through hole 3445 penetrates the front and back of the buffer sheet, so that the buffer sheet is elastically deformed by being squeezed by the protective sheet 342 and the flexible screen 32. The thickness becomes thin.

Please refer to FIG. 9, which is a schematic structural diagram of a front portion of an electronic device in a sixth embodiment of the present application. The structure of the sixth embodiment of the electronic device of the present application is similar to that of the first embodiment, except that in the sixth embodiment, the first frame 21 and the second frame 23 and the protection sheet 342 The intersection line is a wavy line 204, that is, the side of the first frame 21 facing the protection sheet 342 is a wavy surface, and the side of the second frame 23 facing the protection sheet 342 is a wavy surface. . The wavy line 204 can increase the length of the connecting line between the protective sheet 342 and the first frame body 21 and the second frame body 23, so that when the flexible screen 32 is bent, the first frame body 21 and the first frame body 21 are dispersed. The stress between the two frame bodies 23 and the protection sheet 342 prevents the protection sheet 342 from breaking at the intersection with the first frame body 21 and the second frame body 23.

Understandably, in addition to the screen body 322, the flexible screen 32 of the present invention may not include or only include any one or more or all of the cover plate 326 and the support film 324.

Understandably, the term “relative sliding” in the present invention does not limit direct contact and relative sliding between two components, but may also include relative sliding between third-party components, and third-party components are not limited to solid components, such as tablets. Materials, film materials, etc., but can also include non-solid elements, such as gaps, spaces, etc., or a combination of solid elements and non-solid elements; third-party elements are not limited to one, but can include multiple. That is, as long as the two elements have a relative sliding motion relationship, regardless of the actual position of the two elements, it can be considered to be within the range of “relative sliding” as referred to in the present invention.

The above is the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, a number of improvements and retouches can be made. These improvements and retouches also depend on It is the protection scope of the present invention.

Claims

A flexible display device includes a flexible screen, and the front surface of the flexible screen is a display surface. The flexible screen includes a bendable area. The flexible screen is provided with a buffer mechanism on the back thereof, and the buffer mechanism includes a corresponding buffer mechanism. The buffer layer in the bendable area is described. When the flexible screen is bent, the buffer layer is compressed so that the flexible screen is close to or located on the neutral layer of the flexible display device.
The flexible display device according to claim 1, wherein the neutral layer of the flexible display device during bending moves toward the flexible screen in comparison with the neutral layer before bending.
The flexible display device according to claim 1, wherein an elastic modulus of the buffer layer is smaller than an elastic modulus of the flexible screen.
The flexible display device according to claim 1, wherein, during the bending of the flexible screen along the bendable area, the buffer layer is elastically deformed and becomes thinner.
The flexible display device according to claim 1, wherein a thickness of the flexible display device before bending is greater than a thickness after bending.
The flexible display device according to claim 1, wherein the buffer layer comprises a plurality of buffer bodies separated by a gap, and the gap is used to provide a deformation space for the buffer body when the buffer layer is bent.
The flexible display device according to claim 1, wherein the buffer mechanism further comprises a protective sheet provided on a back surface of the buffer layer.
The flexible display device according to claim 7, wherein the buffer layer is fixed between the flexible screen and the protective sheet.
The flexible display device according to claim 8, wherein during the bending of the flexible screen, the protective sheet and the flexible screen are relatively close in an area corresponding to the bendable area, so that The protective sheet and the flexible screen squeeze the buffer layer, so that the buffer layer is elastically deformed and becomes thinner.
The flexible display device according to claim 7, wherein the buffer layer is a plurality of buffer bodies fixed between the protective sheet and the flexible screen corresponding to the bendable area.
The flexible display device according to claim 10, wherein a plurality of the buffer bodies are spaced apart from each other, and a gap exists between two adjacent buffer bodies, and during the bending process of the flexible screen along the bendable area The gap becomes smaller to facilitate the elastic deformation and thinner thickness of the buffer body when it is squeezed.
The flexible display device according to claim 10, wherein each buffer is at least any one of a silicone strip, a foam plastic strip, a foam strip, or a rubber strip having elasticity.
The flexible display device according to claim 10, wherein a plurality of the buffer bodies are arranged along a direction perpendicular to a bending axis of the flexible screen, and each buffer body extends along a direction of the bending axis of the flexible screen.
The flexible display device according to claim 10, wherein the front surface of each buffer is connected to the back of the flexible screen, and the back of the buffer is connected to the front of the protective sheet.
The flexible display device according to claim 7, wherein the protection sheet is at least any one of a thin metal sheet, a liquid metal sheet, a memory alloy sheet, and a plastic sheet.
The flexible display device according to claim 7, wherein an elastic modulus of the protective sheet is greater than an elastic modulus of the flexible screen.
A flexible display device is characterized in that it includes a flexible screen and a buffer layer. The buffer layer is close to and supports the flexible screen. When the flexible screen is bent, the buffer layer is compressed to reduce the extent that the flexible screen is stretched.
The flexible display device according to claim 17, wherein the buffer layer comprises a plurality of buffer bodies, and adjacent buffer bodies are separated by a gap.
The flexible display device according to claim 18, wherein when the buffer layer is compressed, the gap provides a space for the buffer body to deform.
The flexible display device according to claim 18, wherein when the flexible screen is bent, the thickness of the buffer layer at the bent position is reduced.
The flexible display device according to claim 17, wherein the neutral layer of the flexible display device during bending is moved toward the flexible screen in comparison with the neutral layer before bending.
The flexible display device according to claim 17, wherein an elastic modulus of the buffer layer is smaller than an elastic modulus of the flexible screen.
The flexible display device according to claim 17, further comprising a protective sheet attached to a side of the buffer layer away from the flexible screen, and the elastic modulus of the protective sheet is greater than the elastic modulus of the flexible screen.
The flexible display device according to claim 23, wherein the protection sheet is a metal sheet.
An electronic device includes a casing and the flexible display device according to any one of claims 1 to 24. The casing includes a first frame body, a second frame body, and a first frame body connected to the first frame body. The flexible display device is hinged to the second frame body, and the flexible display device is disposed on the first frame body, the second frame body, and the hinge.
The electronic device according to claim 25, wherein the two opposite sides of the protective sheet of the buffer mechanism are fixedly connected to the first frame and the second frame, respectively.
The electronic device according to claim 26, wherein the first frame body and the second frame body are provided with two latching grooves facing a side of the hinge, and two sides of the protection sheet opposite to each other They are respectively fixed in the two clamping slots.
The electronic device according to claim 25, wherein the flexible display device further comprises two supporting plates, wherein one supporting plate is laminated between the first frame and the flexible screen, and the other supporting plate Laminated between the second frame and the flexible screen, each supporting plate is provided with a connecting groove adjacent to the hinge, the connecting groove passes through the supporting plate and faces the side of the hinge, and the buffering The opposite sides of the protection sheet of the mechanism are fixedly received in the two connecting grooves, respectively.