CN112639925A

CN112639925A - Electronic device and flexible display device thereof

Info

Publication number: CN112639925A
Application number: CN201880094132.1A
Authority: CN
Inventors: 陈松亚; 杨松龄
Original assignee: Shenzhen Royole Technologies Co Ltd
Current assignee: Shenzhen Royole Technologies Co Ltd
Priority date: 2018-08-21
Filing date: 2018-08-21
Publication date: 2021-04-09
Also published as: WO2020037507A1

Abstract

The present application provides a flexible display device (30) of an electronic device (100). The utility model provides an electronic device (100) includes casing (20) and flexible display device (30), casing (20) includes first framework (21), second framework (23) and hinge (25), flexible display device (30) set up on first framework (21), second framework (23) and hinge (25), flexible display device (30) include flexible screen (32), the front of flexible screen (32) is the display surface, flexible screen (32) are including region (31) that can bend, the back of flexible screen (32) is provided with buffer gear (34), buffer gear (34) are including buffer layer (344) that correspond region (31) that can bend, when flexible screen (32) are crooked, buffer layer (344) are compressed and make flexible screen (32) be close to or be located the neutral layer of flexible display device (30).

Description

Electronic device and flexible display device thereof

Technical Field

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

Background

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

Disclosure of Invention

The application provides a flexible display device capable of preventing a flexible screen from being damaged, and an electronic device provided with the flexible display device.

The application provides a pair of flexible display device includes flexible screen, and the front of flexible screen is the display surface, flexible screen is including the region of can bending, the back of flexible screen is provided with buffer gear, buffer gear is including corresponding the regional buffer layer of can bending, flexible screen when crooked, the buffer layer is compressed and makes flexible screen be close to or be located flexible display device's neutral layer.

The application also provides a flexible display device, including flexible screen and buffer layer, the buffer layer is close to and supports the flexible screen, and the flexible screen is when crooked, and the buffer layer is compressed and reduces the degree that the flexible screen is stretched.

The application also provides an electronic device, which comprises a shell and a flexible display device, wherein the shell comprises a first frame body, a second frame body and a hinge connected between the first frame body and the second frame body, and the flexible display device is arranged on the first frame body, the second frame body and the hinge. The flexible display device comprises a flexible screen, the front surface of the flexible screen is a display surface, the flexible screen comprises a bendable region, the back surface of the flexible screen is provided with a buffer mechanism, the buffer mechanism comprises a buffer layer corresponding to the bendable region, and when the flexible screen is bent, the buffer layer is compressed to enable the flexible screen to be close to or located on a neutral layer of the flexible display device.

The back of this application electron device's flexible screen is provided with buffer gear, buffer gear is including corresponding the buffer layer that can bend the region, and the flexible screen is when crooked, and the buffer layer is compressed and makes the flexible screen be close to or be located flexible display device's neutral layer, makes the stress that the flexible screen received is less to prevent that bending stress from damaging the screen body layer of flexible screen improves the resistant bending property on screen body layer, thereby can compensate the length variation that flexible display device inside and outside radius difference in bending process arouses is in order to prevent that bending stress from damaging the flexible screen.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic perspective view of an electronic device in a first embodiment of the present application.

Fig. 2 is a sectional view taken along line II-II in fig. 1.

Fig. 3 is a partial schematic view of a front structure of an electronic device in a first embodiment of the present application.

Fig. 4 is a schematic view of a bending state of the electronic device according to the first embodiment of the present application.

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

Fig. 6 is a schematic partial cross-sectional structural diagram of an electronic device in a third embodiment of the present application.

Fig. 7 is a schematic front view of an electronic device according to a fourth embodiment of the present application.

Fig. 8 is a schematic front view of an electronic device according to a fifth embodiment of the present application.

Fig. 9 is a schematic front view of an electronic device according to a sixth embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, 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 terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not imply or indicate that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

In the description of the embodiments of the present invention, it should be understood that the terms "thickness" and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, and do not imply or indicate that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

Referring to fig. 1 to 3, fig. 1 is a schematic perspective view of an electronic device according to a first embodiment of the present application; FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1; fig. 3 is a partial schematic view of a front structure of an electronic device in a first embodiment of the present application. The electronic device 100 in the first embodiment of the present application includes a housing 20 and a flexible display device 30 disposed on the housing 20. The housing 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 housing 21, the second housing 23, and the hinge 25. The flexible display device 30 is provided with a bendable region 31 corresponding to the hinge 25, and a non-bendable region connected to the bendable region 31. The flexible display device 30 includes a flexible screen 32 and a buffer mechanism 34, where the flexible screen 32 includes a screen layer 322, and the screen layer 322 is a main body for displaying images. The buffer mechanism 34 is disposed on the back of the flexible screen 32 corresponding to the bendable region 31. The buffer mechanism 34 includes a buffer layer 344 disposed on the back surface of the flexible screen 32, and the buffer layer 344 has elasticity and can be elastically deformed when being pressed by an external force. The buffer layer 344 has an equivalent modulus of elasticity lower than that of the flexible screen 32. The buffer mechanism 34 is used for the flexible display device 30 to compensate the bending length of the bendable region 31, that is, when the flexible display device 30 bends along the bendable region 31, the flexible screen 32 compresses the buffer layer 344, so that the buffer layer 344 is elastically deformed and becomes thinner, so as to compensate the length change caused by the difference between the inner radius and the outer radius during the bending process of the flexible display device 30, thereby reducing the bending internal stress of the flexible screen 32 and preventing the flexible screen 32 from being damaged. Moreover, because 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 moves towards the flexible screen 32 in comparison with the neutral layer before bending, that is, when the flexible display device is bent, the neutral layer of the flexible display module 30 is close to the flexible screen 32 or is located on the flexible screen 32, so that the tensile stress applied to the flexible screen 32 is reduced or even eliminated. In addition, the buffer mechanism 34 further includes a protection sheet 342 disposed on the back surface of the buffer layer 344. The protective sheet 342 is located between the back surface of the flexible screen 32 and the hinge 25, so that the protective sheet 342 protects the flexible screen 32 itself and the laminated material layer on the back surface thereof, and prevents the flexible screen 32 and the laminated material layer from being worn in the region corresponding to the bendable region 31. 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 of the flexible screen 32 refers to the surface facing away from the light exit surface.

The protective sheet 342 is a flexible support sheet, and the protective 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 sheet made of other suitable materials. In this embodiment, the protective sheet 342 is a liquid metal sheet.

A gap 345 is formed between the front surface of the protective sheet 342 and the back surface of the flexible screen 32 corresponding to the bendable region 31, and the buffer layer 344 is accommodated in the gap 345 and attached between the protective sheet 342 and the flexible screen 32. Specifically, the front surface of the buffer layer 344 is fixedly attached to the back surface of the flexible screen 32, and the back surface of the buffer layer 344 is fixedly attached to the front surface of the protective sheet 342. The back of protection sheet 342 pastes and connects in on the hinge 25, specifically, protection sheet 342 is fixed in through welding, joint or the mode that splices in the front of hinge 25. The back surface of the flexible screen 32 is fixedly attached to the second frame 23 corresponding to the non-bending region. When the electronic device 100 is bent by the hinge 25, the protective sheet 342 and the flexible screen 32 move relatively close to each other in the region corresponding to the bendable region 31, and the protective sheet 342 and the flexible screen 32 press the buffer layer 344 relatively to each other, so that the buffer layer 344 is elastically deformed and becomes thinner, that is, the thickness of the flexible display device 30 before the bending of the bendable region 31 is greater than the thickness after the bending. When the flexible display device is bent, the protective sheet 342 and the flexible screen 32 corresponding to the bendable region 31 compress the buffer layer 344 to compensate for the length change caused by the difference between the inner radius and the outer radius during the bending process of the flexible display device 30, so that the damage of the flexible screen 32 caused by the bending internal stress of the flexible screen 32 corresponding to the bendable region 31 can be reduced; in addition, the screen layer 322 is located at or near a neutral layer position of the flexible display device 30 during bending of the flexible display device 30 to improve bending resistance of the screen layer 322.

When the electronic device 100 is unfolded and flat by the hinge 25, the protection sheet 342 and the flexible screen 32 move relatively and away from each other in the region corresponding to the bendable region 31, the protection sheet 342 and the flexible screen 32 release the pressing of the buffer layer 344, the gap 345 between the front surface of the protection sheet 342 and the back surface of the flexible screen 32 is widened, and the buffer layer 344 is elastically restored.

The neutral layer in this application refers to the flexible display device 30 being bent, the outer layer of the flexible display device 30 being stretched, the inner layer of the flexible display device 30 being squeezed, and a transition layer not being stretched and squeezed being arranged on the cross section of the flexible display device 30, the stress of the transition layer being very small, and the transition layer being the neutral layer. The screen layer 322 herein is located at or near the neutral layer when bent or flattened to improve the flex resistance of the screen layer 322.

The term liquid metal in this application refers to an alloy which is heated to a molten state and then cooled at an ultra-fast cooling rate to solidify the alloy crystal lattice as it is not in a well-ordered arrangement, and is also referred to as an amorphous alloy, liquid metal or metallic glass because it is in an amorphous state like glass. The liquid metal has the characteristics of long-range disorder (short-range order), metastable state, certain physical property isotropy, no definite melting point, glass transition temperature point and the like, has the characteristics of solid state, metal and glass, and can have high strength, high hardness, plasticity, heat conduction, wear resistance and the like under certain conditions. That is, the liquid metal referred to in the present invention is substantially solid at normal temperature, but has some properties close to those of liquid, and is therefore referred to as liquid metal. The liquid metal can be an alloy material of one or more materials of copper, titanium, iron, zirconium, silver, nickel, gallium, gold, antimony, cadmium, zinc, indium, silicon and the like, and the specific metal preferably can obtain other mechanical properties such as lower elastic modulus, hardness, extensibility and the like.

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 abrasion resistance. The protective sheet 342 can effectively resist friction against the hinge 25, and is not easily worn. The liquid metal can be 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, and compared with the existing materials with lower elastic modulus, such as silica gel, foam, plastic and the like, the liquid metal has higher strength and better wear resistance, and can effectively support the flexible screen.

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

The back of the flexible screen 32 of the electronic device 100 of the present application is provided with a buffer mechanism 34, wherein the buffer mechanism 34 comprises a back buffer layer 344 corresponding to the bendable region 31 and arranged on the flexible screen 32, and a protection sheet 342 arranged on the back of the buffer layer 344. When the electronic device 100 is bent through the hinge 25, the flexible screen 32 and the protective sheet 342 are relatively close to each other at the bendable region 31 to squeeze the buffer layer 344, so that the buffer layer 344 is elastically deformed to be thinner, the flexible screen 32 is close to or located at a neutral layer of the flexible display device 30, the stress applied to the flexible screen 32 is less, the bending resistance of the screen layer 322 is improved, and the length change caused by the difference between the inner radius and the outer radius of the flexible display device 30 in the bending process can be compensated, so that the screen layer 322 of the flexible screen 32 is prevented from being damaged by the bending stress; in addition, since the protection sheet 342 is located between the screen body layer 322 and the hinge 25, the back surface of the flexible screen 32 is not worn during the bending or flattening of the electronic device 100, thereby ensuring that the function of the flexible screen 32 is not affected.

As shown in fig. 2, a sliding guide groove 212 is formed at an end of the first frame 21 away from the second frame 23, a sliding block 214 is slidably disposed in the sliding guide groove 212, and an elastic member 216 is disposed between the sliding block 214 and the first frame 21 along a sliding direction of the sliding block 214. In this embodiment, the protection sheet 342 is fixed between the first frame 21 and the second frame 23, specifically, one side of the protection sheet 342 is fixed to the second frame 23, and the other side of the protection sheet 342 is fixed to the slider 214 of the first frame 21. The back surface of the protective sheet 342 is secured to the hinge 25 at the location corresponding to the bendable region 31. The non-bent region at one end of the flexible screen 32 is fixedly attached to the first frame 21, and the non-bent region at the other end of the flexible screen 32 is fixedly attached to the second frame 23. The buffer layer 344 between the back surface of the flexible screen 32 and the protective sheet 342 is elastically deformable, which facilitates the bending and flattening of the flexible display device 30. The elastic member 216 elastically pulls the sliding block 214 to slide towards an end away from the second frame 23, so as to straighten the flexible screen 32 outwards, and prevent the area of the flexible screen 32 corresponding to the bendable area 31 from being separated from the hinge 25 and arching when the electronic device 100 is bent/unfolded.

In this embodiment, the elastic member 216 is a spring, one end of the spring is connected to the first frame 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, wherein the supporting film 324 is attached to the back surface of the flexible screen 32 through optical cement, UV cement, gum and other cement. In this embodiment, the front surface of the support film 324 is fixedly attached to the back surface of the screen 322, the buffer layer 344 is fixedly attached to the back surface of the support film 324 corresponding to the bendable region 31, one end of the support film 324 corresponding to the non-bendable region is fixedly attached to the second frame 23, and the other end of the support film 324 corresponding to the non-bendable region is fixedly attached to the slider 214 and the first frame 21.

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

An optical adhesive is laminated between the support film 324 and the first frame 21 to firmly connect the flexible screen 32 and the first frame 21.

The cover plate 326 is a thin plate that is transparent and resistant to bending, and in this embodiment, the cover plate 326 is an ultra-thin cover glass, and the thickness of the ultra-thin cover glass is in a micron order.

The reason why the ultra-thin cover glass is used as the cover plate 326 in this embodiment is that the ultra-thin cover glass has the advantages of better bending resistance, high strength, high hardness and the like, and when the ultra-thin cover glass is attached to the front surface of the screen body layer 322, the ultra-thin cover glass can not only bend or flatten along with the flexible screen 32, but also can effectively resist the scratch of the ultra-thin cover glass by external objects and is not easy to wear. Secondly, the elastic modulus of the ultra-thin cover glass is low, and the ultra-thin cover glass can be directly adhered to the front surface of the flexible screen 32, and can be synchronously or approximately synchronously stretched along with the flexible screen 32 when the flexible display device 30 is bent, so that the situation that the flexible display device 30 is damaged due to large difference of stretching amplitude when the flexible display device is bent is avoided. On the other hand, the luminousness of ultra-thin glass cover plate is high, and is convenient the ejaculate of the light of flexible screen 32, and after long-time the use, ageing problems such as discolour also can not appear to ultra-thin glass cover plate.

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

As shown in fig. 2, the flexible display device 30 further includes two supporting plates 36, wherein one supporting plate 36 is stacked between the front surface of the first frame body 21 and the back surface of the supporting film 324, and the other supporting plate 36 is stacked between the front surface of the second frame body 23 and the back surface of the supporting film 324. Two of the support plates 36 are used to support the flexible screen 32 on the housing 20. The back surfaces of the two supporting plates 36 are respectively fixed and attached to the first frame 21 and the second frame 23 by means of glue, welding, screw locking, buckling, magnetic attraction, and the like. In this embodiment, each supporting plate 36 is a plastic sheet.

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

In this embodiment, two opposite sides of the protection sheet 342 parallel to the bending axis of the flexible screen 32 are respectively and fixedly connected to the side surfaces of the slider 214 and the second frame 23 of the first frame 21 adjacent to the hinge 25, so that a gap 345 is formed between the support film 324 and the protection sheet 342 to accommodate the buffer layer 344. The front surface of the protective sheet 342 is not flush with the front surface of the support plate 36, i.e., the front surface of the protective 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 herein is not limited to a solid axis, but may be a non-solid axis, and may be considered a bending axis as long as the flexible screen 32 is capable of bending about the axis.

Referring to fig. 2 and 3, the cushioning layer 344 is a plurality of cushioning bodies 3442 fixed between the protection sheet 342 and the flexible screen 32 and having different compression ratios and rebound ratios corresponding to the bendable region 31. Specifically, one or more layers of buffering bodies 3442 with different compression ratios and rebound ratios are fixed in the gap 345 between the front surface of the protection plate 342 and the back surface of the flexible screen 32. The buffer bodies 3442 are spaced apart from each other to facilitate the buffer bodies 3442 to be elastically deformed and to be thin when being pressed. That is, a space is formed between the adjacent buffer bodies 3442 to serve as a storage space when the buffer bodies 3442 are deformed. Each of the buffer bodies 3442 is a buffer strip made of an elastic material, and specifically, each of the buffer bodies 3442 may be at least one of a silicone strip, a foam plastic strip, a tampon strip, or a rubber strip having elasticity.

In this embodiment, the buffer bodies 3442 are arranged in a direction perpendicular to the bending axis of the flexible screen 32, and each buffer body 3442 extends in the direction of the bending axis of the flexible screen 32. The front surface of each of the buffering bodies 3442 is fixedly attached to the back surface of the supporting film 324 by a glue or a double-sided tape, and the back surface of each of the buffering bodies 3442 is fixedly attached to the front surface of the protection sheet 342 by a glue or a double-sided tape.

Fig. 4 is a schematic view illustrating a bending state of an electronic device according to a first embodiment of the present application. When the electronic device 100 is used and the electronic device 100 is bent along the hinge 25, the flexible screen 32 and the protective sheet 342 are relatively close to each other at the bendable region 31 to squeeze the buffer layer 344, and the gap 345 is reduced, so that the buffer layer 344 is elastically deformed to be thinner, the length change caused by the difference between the inner radius and the outer radius of the flexible display device 30 in the bending process can be compensated, and the screen layer 322 is prevented from being damaged by the bending stress; secondly, during the bending process of the flexible display device 30, the neutral layer of the flexible display device 30 moves upwards, so that the screen layer 322 is located at the neutral layer position of the flexible display device 30 corresponding to the bendable region 31, and therefore, the screen layer 322 is subjected to less stress, so that the bending resistance of the screen layer 322 is improved, and the service life of the flexible screen 32 is prolonged; in addition, the elastic member 216 always keeps pushing against the sliding block 21 to prevent the flexible screen 32 from separating from the hinge 25 and arching corresponding to the region of the bendable region 31.

In other embodiments, the hinge 25 may be omitted and the cushioning mechanism 34 may provide both cushioning and support for the flexible screen 32.

Further, the protective sheet 342 may be omitted, and the flexible screen 32 may also be capable of compressing the cushioning layer 344 to move the neutral plane upward when flexed.

Referring to fig. 5, fig. 5 is a schematic partial cross-sectional structure diagram of an electronic device according to 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, two opposite clamping grooves 202 are formed on the side surfaces of the slider 214 of the first frame 21 and the second frame 23 facing the hinge 25. Each snap groove 202 extends in a direction parallel to the bending axis of the flexible screen 32. Two opposite sides of the protection sheet 342 are respectively clamped in the two clamping grooves 202, so that the protection sheet 342 is fixed on the housing 20, a gap 345 is formed between the front surface of the protection sheet 342 and the back surface of the flexible screen 32, and the buffer layer 344 is accommodated in the gap 345 and fixed between the protection sheet 342 and the flexible screen 32.

Referring to fig. 6, fig. 6 is a schematic diagram of a partial cross-sectional structure of an electronic device in 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 slot 362 is formed on the back surface of each supporting plate 36 adjacent to the hinge 25, the connecting slot 362 penetrates through the side surface of the supporting plate 36 facing the hinge 25, and the connecting slot 362 extends along a direction parallel to the bending axis of the flexible screen 32. The both sides that the protection sheet 342 is relative are fixed respectively accept in two in the joint groove 202 to the messenger protection sheet 342 is fixed in on the flexible display device 30, the front of protection sheet 342 with clearance 345 between the back of flexible screen 32, buffer layer 344 accept in clearance 345 and be fixed in protection sheet 342 with between the flexible screen 32.

The buffering mechanism 34 in this embodiment is integrated with the flexible display device 30, so that the flexible display device 30 can be conveniently and integrally mounted or replaced on the housing 20, and the assembly efficiency is improved.

Referring to fig. 7, fig. 7 is a schematic front view of an electronic device according to 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 a plurality of buffer bodies 3442 fixed between the protection sheet 342 and the flexible screen 32. The buffer bodies 3442 are spaced apart from each other to facilitate the buffer bodies 3442 to be elastically deformed and to be thin when being pressed. These buffer bodies 3442 are arranged in a direction parallel to the bending axis of said flexible screen 32, each buffer body 3442 extending in a direction perpendicular to the bending axis of said flexible screen 32, the length of each buffer body 3442 being less than the length of said bendable area 31 in a direction perpendicular to the bending axis of said flexible screen 32.

Referring to fig. 8, fig. 8 is a schematic front view of an electronic device according to 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 a buffer sheet fixed between the protection 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 through the front and back of the buffer sheet, so that the buffer sheet is squeezed by the protection sheet 342 and the flexible screen 32 to elastically deform and thin.

Referring to fig. 9, fig. 9 is a schematic front view of an electronic device according to 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 intersecting line between the first frame 21 and the second frame 23 and the protective sheet 342 is a wavy line 204, that is, the side surface of the first frame 21 facing the protective sheet 342 is a wavy surface, and the side surface of the second frame 23 facing the protective sheet 342 is a wavy surface. The wavy line 204 can increase the length of the connection line between the protective sheet 342 and the first and

second housings

21 and 23, thereby dispersing stress between the first and

second housings

21 and 23 and the protective sheet 342 when the flexible panel 32 is bent, and preventing the protective sheet 342 from being broken at the intersection with the first and

second housings

21 and 23.

It is understood that the flexible screen 32 of the present invention may also include none or only any one or more or all of the cover 326 and the support film 324 in addition to the screen body 322.

It is to be understood that the term "relative sliding" in the present invention does not limit the direct contact and relative sliding between two elements, but may also include the relative sliding of a third-party element, and the third-party element is not limited to a solid element, such as a sheet, a film, etc., but may also include a non-solid element, such as a gap, a space, etc., or a combination of a solid element and a non-solid element; the third party element is also not limited to one, but may include a plurality. That is, as long as two elements have a relative sliding kinematic relationship, regardless of the actual positions of the two elements, they can be considered to be within the scope of what is referred to herein as "relative sliding".

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims

The flexible display device is characterized in that a buffer mechanism is arranged on the back surface of the flexible screen, the buffer mechanism comprises a buffer layer corresponding to the bendable region, and when the flexible screen is bent, the buffer layer is compressed to enable the flexible screen to be close to or located on a neutral layer of the flexible display device.
The flexible display device of claim 1, wherein the neutral layer of the flexible display device when bent is moved in a direction towards the flexible screen compared to the neutral layer before bending.
The flexible display device of claim 1, wherein the buffer layer has a modulus of elasticity less than a modulus of elasticity of the flexible screen.
The flexible display device of claim 1, wherein the buffer layer is elastically deformed to be thinner during bending of the flexible screen along the bendable region.
The flexible display device of claim 1, wherein a thickness of the flexible display device before bending of the bendable region is greater than a thickness after bending.
The flexible display device of claim 1, wherein the buffer layer comprises a plurality of buffer bodies separated by gaps for providing deformation space for the buffer bodies when the buffer layer is bent.
The flexible display device of claim 1, wherein the buffer mechanism further comprises a protective sheet disposed on a back surface of the buffer layer.
The flexible display device of claim 7, wherein the buffer layer is secured between the flexible screen and the protective sheet.
The flexible display device according to claim 8, wherein during the bending of the flexible panel, the protective sheet and the flexible panel are relatively close to each other in a region corresponding to the bendable region, and the protective sheet and the flexible panel press the buffer layer to elastically deform the buffer layer to reduce the thickness of the buffer layer.
The flexible display device of claim 7, wherein the cushioning layer is a plurality of cushioning bodies secured between the protective sheet and the flexible screen corresponding to the bendable region.
The flexible display device according to claim 10, wherein a plurality of said buffer bodies are spaced apart from each other, and a gap is formed between two adjacent buffer bodies, and said gap is reduced during bending of said flexible screen along said bendable region, so as to facilitate elastic deformation of the buffer bodies when the buffer bodies are pressed and to reduce the thickness of the buffer bodies.
The flexible display device according to claim 10, wherein each of the buffer bodies is at least 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 in a direction perpendicular to a bending axis of the flexible screen, each buffer body extending in the direction of the bending axis of the flexible screen.
The flexible display device of claim 10, wherein a front surface of each cushion body is attached to a back surface of the flexible screen, and a back surface of the cushion body is attached to a front surface of the protective sheet.
The flexible display device according to claim 7, wherein the protective 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 of claim 7, wherein the protective sheet has a modulus of elasticity greater than a modulus of elasticity of the flexible screen.
A flexible display device, characterized by: including flexible screen and buffer layer, the buffer layer is close to and supports the flexible screen, and the flexible screen is when crooked, and the buffer layer is compressed and reduces the degree that the flexible screen is stretched.
The flexible display device of claim 17, wherein the buffer layer comprises a plurality of buffer bodies, adjacent buffer bodies being separated by a gap.
The flexible display device of claim 18, wherein the gap provides a space for deformation of the buffer body when the buffer layer is compressed.
The flexible display device of claim 18, wherein the buffer layer decreases in thickness at a bend location when the flexible screen is bent.
The flexible display device of claim 17, wherein the neutral layer of the flexible display device when bent is moved in a direction towards the flexible screen compared to the neutral layer before bending.
The flexible display device of claim 17, wherein the buffer layer has a modulus of elasticity less than a modulus of elasticity of the flexible screen.
The flexible display device of claim 17, further comprising a protective sheet attached to a side of the cushioning layer remote from the flexible screen, the protective sheet having a modulus of elasticity greater than the modulus of elasticity of the flexible screen.
The flexible display device of claim 23, wherein the protective sheet is a metal sheet.
An electronic device comprising a housing and the flexible display device according to any one of claims 1 to 24, wherein the housing comprises a first frame, a second frame, and a hinge connected between the first frame and the second frame, and the flexible display device is disposed on the first frame, the second frame, and the hinge.
The electronic device according to claim 25, wherein 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 and the second frame have two engaging grooves formed on sides thereof facing the hinge, and opposite sides of the protective sheet are engaged with the two engaging grooves respectively.
The electronic device according to claim 25, wherein the flexible display device further comprises two supporting plates, one of the supporting plates is stacked between the first frame and the flexible panel, the other supporting plate is stacked between the second frame and the flexible panel, each supporting plate has a connecting slot adjacent to the hinge, the connecting slot extends through a side of the supporting plate facing the hinge, and two opposite sides of the protection plate of the buffer mechanism are respectively and fixedly received in the two connecting slots.