CN112602034A

CN112602034A - Electronic device and flexible display device thereof

Info

Publication number: CN112602034A
Application number: CN201880093894.XA
Authority: CN
Inventors: 刘亮; 施文杰; 张琨; 陈松亚
Original assignee: Shenzhen Royole Technologies Co Ltd
Current assignee: Shenzhen Royole Technologies Co Ltd
Priority date: 2018-06-15
Filing date: 2018-08-09
Publication date: 2021-04-02
Also published as: WO2019237484A1; CN112639922A; WO2019237485A1; CN112602139A; WO2019237337A1; WO2019237487A1; CN208922655U; CN112602140A; CN208806016U; WO2019237486A1; CN112513772A

Abstract

The application provides an electronic device (100) includes casing (20) and flexible display device (30), casing (20) include first framework (21), second framework (23) and hinge (25), flexible display device (30) set up in first framework (21), second framework (23) and hinge (25) on, flexible display device (30) are including flexible screen (32), the back of flexible screen (32) is range upon range of has protecting piece (34) of being made by resistant material of buckling, flexible screen (32) are provided with region (31) of can bending, protecting piece (34) cover region (31) of can bending, flexible screen (32) are including screen body layer (322), protecting piece (34) are used for supporting screen body layer (322). The back surface of the flexible screen (32) is not worn and the bending resistance of the flexible screen (32) is improved.

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 the flexible screen, electronic devices of foldable display screens have appeared in the prior art, and the bending of the flexible screen is generally realized by a hinge in the existing electronic devices of foldable display screens. However, in the conventional electronic device, the flexible screen and the hinge may slide relatively and rub during the bending or flattening process, and therefore, the flexible screen is easily damaged, and the function of the flexible screen is affected.

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, including flexible screen, the back of flexible screen is range upon range of has the screening glass of being made by resistant material of buckling, flexible screen is provided with the region of can bending, the screening glass covers the region of can bending, flexible screen includes the screen layer, the screening glass is used for supporting the screen layer.

This application still provides an electron device includes casing and flexible display device, the casing include first framework, second framework and connect in first framework with hinge between the second framework, flexible display device set up in first framework, second framework reach on the hinge, flexible display device includes flexible screen, the back of flexible screen is range upon range of has the screening glass of being made by resistant material of buckling, flexible screen is provided with the region of can bending, the screening glass covers the region of can bending, flexible screen includes the screen layer, the screening glass is used for supporting the screen layer.

The back of this application electron device's flexible screen is provided with the screening glass, the screen level of flexible screen is located flexible display device's neutral layer position. Therefore, when the electronic device is bent or flattened through the hinge, the protection sheet has the function of protecting the flexible screen, and the stress on the screen body layer is less, so that the bending resistance of the screen body layer is improved, and the service life of the flexible screen is prolonged.

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

Fig. 4 is an enlarged view of the portion IV in fig. 3.

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

Fig. 6 is an enlarged view of a VI portion in fig. 5.

Fig. 7 is a schematic partial sectional structure diagram of an electronic device in a fourth embodiment of the present application.

Fig. 8 is an enlarged view of a portion VIII in fig. 7.

Fig. 9 is a schematic partial cross-sectional structural diagram of an electronic device in a fifth embodiment of the present application.

Fig. 10 is an enlarged view of the X portion in fig. 9.

Fig. 11 is a schematic partial cross-sectional structural diagram of an electronic device in a sixth embodiment of the present application.

Fig. 12 is a schematic partial cross-sectional structural view of an electronic device in a seventh embodiment of the present application.

Fig. 13 is a schematic front structure diagram of an electronic device in an eighth embodiment of the present application.

Fig. 14 is a schematic front structure diagram of an electronic device in a ninth embodiment of the present application.

Fig. 15 is a schematic front structure diagram of an electronic device in a tenth 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 and fig. 2 together, fig. 1 is a schematic perspective view of an electronic device according to a first embodiment of the present application; fig. 2 is a sectional view taken along line II-II in fig. 1. 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 an unbent region connected to the bendable region 31. The flexible display device 30 includes a flexible screen 32 and a protection sheet 34 disposed on the back of the flexible screen 32. The protective sheet 34 covers the bendable region 31. The flexible screen 32 includes a screen layer 322, the protection sheet 34 is disposed on the back of the screen layer 322, and the protection sheet 34 is used for supporting and protecting the flexible screen 32, so as to improve the rigidity of the flexible screen 32 and prevent the back of the flexible screen 32 from being worn. The screen layer 322 is the main body of the display image.

In this embodiment, the protection sheet 34 may be silicon, foam, thin metal sheet such as copper foil, liquid metal sheet, memory alloy or other suitable material. More preferably, a liquid metal sheet is used, the liquid metal sheet may 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 is preferably selected to obtain other mechanical properties such as lower elastic modulus, hardness, extensibility, and the like. The front surface of the protection sheet 34 is fixedly attached to the back surface of the flexible screen 32 through glue, and the back surface of the protection sheet 34 and the hinge 25 can slide relatively. When the electronic device 100 is bent by the hinge 25, the flexible display device 30 is bent along the bendable region 31, and the protective sheet 34 slides with respect to the hinge 25. During bending of the flexible display device 30, the screen layer 322 is located at a neutral layer position of the flexible display device 30 to improve the bending resistance of the screen layer 322. The front surface of the flexible screen 32 refers to the light emitting surface of the flexible screen 32, and the back surface of the flexible screen 32 refers to the surface facing back to the light emitting surface.

The neutral layer is a transition layer which is not stretched and not extruded on the section of the flexible display device 30, wherein the transition layer has little stress and is the neutral layer, and the outer layer of the flexible display device 30 is stretched and the inner layer of the flexible display device 30 is extruded in the bending process of the flexible display device 30. The screen layer 322 in this application is positioned on the neutral layer to improve the resistance to bending of the screen layer 322.

The term liquid metal as used herein 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 reason why the liquid metal sheet is selected as the protection sheet 34 in this embodiment is that the liquid metal sheet has better wear resistance, and when the liquid metal sheet is attached to the back surface of the flexible screen 32 through glue such as optical glue, UV glue, and back glue, the liquid metal sheet can not only support the flexible screen 32, but also effectively resist the friction of the hinge 25 against the liquid metal sheet, and the liquid metal sheet is not easy to wear. On the other hand, the liquid metal sheet has a low elastic modulus, and can be directly adhered to the back of the flexible screen 32, and the flexible display device 30 can be stretched synchronously or approximately synchronously along with the flexible screen 32 when being bent, so that the flexible display device 30 is prevented from being damaged due to large difference of stretching amplitude when being bent. Compared with the existing materials with lower elastic modulus, such as silica gel, foam, plastic, thin metal sheets, memory alloy and the like, the liquid metal has higher strength and better wear resistance, and can effectively support the flexible screen.

The protective sheet 34 may be attached to the entire back surface of the flexible screen 32, or may be attached only to the bendable region 31 of the back surface of the flexible screen, that is, only the bendable region 31 of the back surface of the flexible screen 32 is attached with the protective sheet 34, and the non-bendable region is not distributed with the protective sheet 34, so as to save the manufacturing cost of the flexible display device 30.

The protective sheet 34 covers the non-bending region of the back surface of the flexible screen 32 in a full-covering manner, which can avoid the occurrence of a step difference on the two opposite sides of the protective sheet 34, which may result in the occurrence of wrinkles or poor appearance of the flexible screen 32.

The position of the neutral layer of the flexible display device 30 may be determined by adjusting the modulus of elasticity and/or the thickness of the respective film material of the bendable region 31 of the flexible display device 30. In this embodiment, the screen layer 322 is located at the neutral layer position of the flexible display device 30 by adjusting the thickness and/or the elastic modulus of the protection sheet 34 in the region corresponding to the bendable region 31. When the flexible screen 32 is bent, the protective sheet 34 is also bent along with the flexible screen 32, and the screen layer 322 is located at a neutral layer position of the flexible display device 30. The protective sheet 34 may be selected as a reference layer, the distance from the reference layer to the neutral layer should satisfy Yn (Σ (Ti × Ei))/(Σ (Ti × Ei)), Yn being the distance from the reference layer to the neutral layer, Ti being the corresponding layer thickness of the flexible display device, Ei being the corresponding layer elastic modulus of the flexible display device, Yi being the distance from the reference layer to the geometric center of the corresponding component layer, and i being the corresponding number of layers.

Preferably, the elastic modulus of the protection sheet 34 is greater than the elastic modulus of the flexible screen 32, and since the elastic modulus of each layer of film material (such as a light emitting layer, a substrate layer, a cathode layer, an anode layer, a TFT layer, etc.) of the flexible screen 32 is in a lower range, if a commonly used metal sheet is adopted, such as a steel plate, an aluminum plate, etc., as a protection layer to be directly attached and fixed to the flexible screen, since the elastic modulus of the common metal sheet is much greater than the elastic modulus of each layer of film material of the flexible screen, when the flexible screen is bent together with the flexible screen, the flexible screen is easily damaged due to an excessive difference in stretching amount. Therefore, the liquid metal with the elastic modulus more approximate to that of the flexible screen is adopted as the protective sheet, compared with common metal sheets, the liquid metal with the elastic modulus more approximate to that of the flexible screen, and the liquid metal can provide sufficient hardness to support the flexible screen, so that the liquid metal is an ideal material. The difference between the elastic moduli of the liquid metal protective sheet 34 and the flexible screen 32 (the elastic modulus of the flexible screen is the average elastic modulus of the respective film layers) is 100Gpa and 120Gpa, and more preferably 100Gpa or less.

More preferably, the thickness of the liquid metal protective sheet of an embodiment of the present invention is between 5 micrometers (μm) and 200 micrometers inclusive. The liquid metal protection sheet within the thickness range can provide sufficient supporting force for the flexible screen 32, has excellent bending performance, and can avoid the situation that the bending of the flexible screen is influenced by the over-thickness of the protection sheet 34. Further, the thickness of the liquid metal protective sheet can be controlled below 50um to obtain more desirable bending properties.

In other embodiments, the protection sheet 34 may also be made of stainless steel sheet, soft wear-resistant plastic sheet, soft wear-resistant rubber sheet, or soft silicone sheet.

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 surface of the flexible screen 32 of the electronic device 100 of the present application is provided with a protective sheet 34, that is, the back surface of the flexible screen 32 is contacted with the hinge 25 through the protective sheet 34 at the position corresponding to the bendable region 31. When the electronic device 100 is bent or unfolded by the hinge 25, the protective sheet 34 and the hinge 25 slide relatively at the bendable region 31, so that the protective sheet 34 has the function of protecting the flexible screen 32, and the back surface of the flexible screen 32 is not worn during the bending or unfolding of the electronic device 100, thereby ensuring that the function of the flexible screen 32 is not affected; secondly, when the flexible screen 32 is bent along the bendable region 31, because the screen body layer 322 of the flexible screen 32 is located at a neutral layer position of the flexible display device 30, the screen body layer 322 is subjected to less stress, so that the bending resistance of the screen body layer 322 is improved, and the service life of the flexible screen 32 is prolonged; in addition, the hardness of the protective sheet 34 can sufficiently support the flexible screen 32, and the rigidity of the flexible screen 32 is improved.

One end of the first frame 21, which is away from the second frame 23, is provided with a sliding guide groove 212, the sliding guide groove 212 is slidably provided with a sliding block 214, 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, one end of the back surface of the protection sheet 34 is fixedly attached to the second frame 23, the other end of the back surface of the protection sheet 34 is fixedly attached to the first frame 21, and the middle portion of the back surface of the protection sheet 34 is slidably connected to the hinge 25, so that the flexible display device 30 can be bent and flattened. One end of the back surface of the flexible screen 32 is fixedly attached to the slider 214, and the other end of the back surface of the flexible screen 32 is fixedly attached to the front surface of the protective sheet 34. The back surface of the flexible screen 32 is fixedly attached to the front surface of the protective sheet 34 in a region corresponding to the bendable region 31. The elastic member 216 elastically pushes 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 region of the flexible display device 30 corresponding to the bendable region 31 from separating 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.

In this embodiment, the flexible screen 32 further includes a supporting film 324 laminated on the back surface of the screen layer 322, and a cover plate layer 326 laminated on the front surface of the screen layer 322. The support film 324 is fixedly attached to the back surface of the screen layer 322 by using an optical adhesive, a UV adhesive, a back adhesive, or the like; the protective sheet 34 is fixedly attached to the back surface of the support film 324 by a glue such as an optical glue, a UV glue, or a back glue. The screen layer 322 can be positioned at the neutral layer position of the flexible display device 30 by adjusting the thickness and/or the elastic modulus of the cover sheet layer 326, the protective sheet 34, and the support film 324. The support film 324 may be a PET film, a PI film, a PC film, or the like.

An optical adhesive is also laminated between the support film 324 and the slider 214 to make the connection between the back surface of the flexible screen 32 and the slider 214 more secure. An optical adhesive is laminated between the back surface of the protective sheet 34 and the first and

second housings

21 and 23, thereby further securing the flexible panel 32 to the first and

second housings

21 and 23.

In other embodiments, the front surface of the protection sheet 34 and the back surface of the support film 324 slide relative to each other corresponding to the bendable region 31, and the back surface of the protection sheet 34 is fixed to the first frame 21, the second frame 23, and the hinge 25 by gluing, welding, or clamping. When the electronic device 100 is bent or unfolded by the hinge 25, the protective sheet 34 and the support film 324 slide relatively in the region of the bendable region 31, and the screen layer 322 is located at the neutral layer position of the flexible display device 30, so that the hinge 25 can be effectively prevented from being worn to the flexible screen 32, and the bending resistance of the flexible screen 32 is improved.

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

The reason why the ultra-thin cover glass is selected as the cover plate layer 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 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.

Preferably, the thickness of the cover plate layer 326 ranges from 5 micrometers to 80 micrometers (inclusive), the elastic modulus of the cover plate layer 326 ranges from 50GPa to 100GPa (inclusive), and the yield strength is greater than 1 GPa.

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

In the present application, if the thickness and the elastic modulus of the cover plate layer 326 are set to t1 and E1, respectively, the thickness and the elastic modulus of the protection sheet 34 are set to t2 and E2, respectively. When the cover plate layer 326 has an elastic modulus comparable to that of the protect sheet 34, i.e., E1 ≈ E2, the cover plate layer 326 and the protect sheet 34 should be provided with a thickness satisfying 2t1 ≈ t 2; when the cover plate layer 326 corresponds to the thickness of the protect sheet 34, i.e., t1 ≈ t2, the modulus of elasticity of the cover plate layer 326 and the protect sheet 34 should be set to satisfy 2.5E1 ≈ E2. The terms "equivalent" and "approximately equal to (≈)" mean that the ratio of the difference between the previous and subsequent values is less than or equal to 20%, i.e., E1 ≈ E2 indicates that | E1-E2 | (the smaller values in E1 and E2) is less than or equal to 20%, and other expressions may refer to the above expressions.

In this embodiment, the front surface of the protective sheet 34 and the back surface of the flexible screen 32 are bonded to each other through a colloid layer, the storage modulus value of the colloid layer is greater than or equal to 50KPa, and the glass transition temperature of the colloid 36 is less than or equal to-20 ℃.

In other embodiments, the back surface of the screen body layer 322 may further be provided with a light-shielding black glue layer, and the support film 324 is fixedly attached to the back surface of the light-shielding black glue layer of the screen body layer 322 to prevent or reduce the light-shielding black glue layer of the flexible screen 32 from being worn.

Referring to fig. 3 and 4, fig. 3 is a schematic partial cross-sectional structure view of an electronic device according to a second embodiment of the present application, and fig. 4 is an enlarged view of a portion IV in fig. 3. The structure of the second embodiment of the electronic device of the present application is similar to that of the first embodiment, except that: the flexible display device 30 further includes a support sheet 36 laminated on the rear surface of the protective sheet 34, wherein the thickness of the support sheet 36 is greater than or equal to the thickness of the protective sheet 34, so as to provide a more sufficient supporting force. The support sheet 36 has a strength greater than that of the protective sheet 34. The support sheet 36 is made of a bending-resistant material, and the front surface of the support sheet 36 slides relative to the back surface of the protective sheet 34 in the region corresponding to the bendable region 31, that is, the front surface of the support sheet 36 and the back surface of the protective sheet 34 are not fixed in the region corresponding to the bendable region 31.

In the present embodiment, the elastic modulus of the protective sheet 34 is smaller than the elastic modulus of the support sheet 36. Further, the difference between the elastic modulus of the protective sheet 34 and the elastic modulus of the flexible screen 32 is smaller than the difference between the elastic modulus of the support sheet 36 and the elastic modulus of the protective sheet 34. The protective sheet 34 is a liquid metal.

More preferably, the protective sheet 34 of an embodiment of the present invention is a liquid metal protective sheet made of liquid metal, the thickness of which is between 5 micrometers (μm) and 200 micrometers inclusive. The liquid metal protection sheet within the thickness range can provide sufficient supporting force for the flexible screen 32, has excellent bending performance, and can avoid the situation that the bending of the flexible screen is influenced by the over-thickness of the protection sheet 34. Further, the thickness of the liquid metal protective sheet is between 5 microns and 50 microns (inclusive) to obtain more desirable bending properties.

The support sheet 36 may be a liquid metal sheet, a soft wear-resistant plastic sheet, a soft wear-resistant rubber sheet, or a soft silicone sheet. The support sheet 36 may also be made of a material such as a layer of tetrafluoroethylene, graphite, molybdenum disulfide, or thermoplastic polyurethane elastomer rubber. In this embodiment, the supporting sheet 36 is a liquid metal sheet, and specifically, the thickness of the supporting sheet 36 is between 50 micrometers and 300 micrometers (inclusive).

In other embodiments, the support plate 36 may be a flexible steel plate, specifically, a stainless steel sheet.

In this embodiment, the back surface of the support sheet 36 covers the first frame body 21, the second frame body 23 and the hinge 25, and the support sheet 36 is bent or laid flat along with the bending or flattening of the hinge 25. Specifically, the back surface of the support sheet 36 is fixedly attached to the front surface of the hinge 25 and the front surfaces of the first frame and the second frame by means of glue, welding, screw locking, fastening, magnetic attraction, and the like. The front surface of the supporting piece 36 is opened with a receiving groove 362 corresponding to the bendable region 31, and the protection sheet 34 can be slidably received in the receiving groove 362. The protection sheet 34 is accommodated in the accommodating groove 362, and the front surface of the protection sheet 34 is fixedly attached to the back surface of the support film 324 through glue such as optical glue, UV glue, and back glue, at this time, the support sheet 36 faces the side surface of the flexible screen 32 and the protection sheet 34 faces the side surface of the flexible screen 32.

Referring to fig. 4, the length of the receiving groove 362 extending in the direction perpendicular to the bending axis of the flexible panel 32 is greater than the length of the protection sheet 34 extending in the direction perpendicular to the bending axis of the flexible panel 32, that is, the length of the receiving groove 362 in the length direction of the outer side of the flexible panel 32 is greater than the length of the protection sheet 34 in the length direction of the outer side of the flexible panel 32. The thickness of the receiving groove 362 is greater than or equal to the thickness of the protection sheet 34. The receiving slot 362 of the supporting plate 36 is formed by laser or etching. The bending axis is not limited to a solid axis, but may be a non-solid axis, and the flexible screen can be regarded as a bending axis as long as the flexible screen can bend around the axis.

In this embodiment, the receiving groove 362 covers the bendable region 31, that is, the opening area of the receiving groove 362 is greater than or equal to the area of the bendable region 31. The back surface of the protective sheet 34 is slidably attached to the inner surface of the receiving groove 362 facing the flexible panel 32. The rear surface of the protective sheet 34 is a side surface of the protective sheet 34 facing away from the flexible panel 32, and the inner surface of the storage groove 362 facing the protective sheet 34 is a groove bottom surface of the storage groove 364. When the electronic device 100 is bent or flattened by the hinge 25, the back surface of the protective sheet 34 and the bottom surface of the receiving groove 364 slide relative to each other, so that the hinge 25 can be prevented from abrading the flexible screen 32.

In other embodiments, the receiving slot 362 may pass through the back surface of the supporting sheet 36, and the back surface of the protecting sheet 34 is flush with the back surface of the supporting sheet 36, that is, the side of the protecting sheet 34 facing away from the flexible screen 32 is flush with the side of the supporting sheet 36 facing away from the flexible screen 32.

In other embodiments, a slip-assisting material is disposed between the back surface of the protective sheet 34 and the bottom of the receiving groove 362. The slip-assisting substance may be teflon. Of course, in other embodiments, the surface of the protective sheet facing the support sheet may be coated with the above-mentioned slipping agent to reduce the friction between the protective sheet and the support sheet.

In other embodiments, the opening area of the receiving groove 362 may be smaller than the area of the bendable region 31.

Referring to fig. 5 and fig. 6, fig. 5 is a schematic partial cross-sectional structure view of an electronic device according to a third embodiment of the present application, and fig. 6 is an enlarged view of a VI portion in fig. 5. The structure of the third embodiment of the electronic device of the present application is similar to that of the second embodiment, except that: in the third embodiment, a gap 364 is provided between the rear surface of the protective sheet 34 and the inner surface of the housing groove 362 (i.e., the groove bottom surface). When the electronic device 100 is bent or flattened by the hinge 25, the protective sheet 34 moves in the receiving groove 362, but a gap 364 is formed between the rear surface of the protective sheet 34 and the bottom surface of the receiving groove 364 without friction contact, so that the flexible screen 32 can be better prevented from being abraded.

As shown in fig. 6, in particular, the receiving groove 362 includes a groove bottom surface 3621 facing the back surface of the protection sheet 34, and two opposite inner side surfaces 3623, and each inner side surface 3623 is parallel to the bending axis of the flexible screen 32. The two inner side surfaces 3623 and the groove bottom surface 3621 together define the receiving groove 362. The gap 364 is defined between the groove bottom surface 3621 and the back surface of the protective sheet 34, and between the two inner side surfaces 3623 and the outer side surfaces corresponding to the protective sheet 34. The support sheet 36 has a thickness a of between 50 microns and 300 microns inclusive. The width b of the gap between the back surface of the protective sheet 34 and the groove bottom surface 3621 is 10 to 300 micrometers (inclusive). The clearance c between each inner side 3623 and the corresponding outer side of the protective sheet 34 is greater than 0 microns. By maintaining the gap width within the above range, the friction between the protective sheet 34 and the support sheet 36 can be effectively reduced, and the thickness of the entire machine can be controlled.

Referring to fig. 7 and 8, fig. 7 is a schematic partial cross-sectional structure view of an electronic device according to a fourth embodiment of the present disclosure, and fig. 8 is an enlarged view of a portion VIII in fig. 7. The structure of the fourth embodiment of the electronic device of the present application is similar to that of the third embodiment, except that: in the fourth embodiment, a chamfer 3625 is provided at the intersection of each inner side 3623 and the slot bottom 3621, and the chamfer 3625 can disperse the stress generated by the supporting sheet 36 during the bending process, so as to avoid the supporting sheet 36 from generating excessive stress at the position where the inner side 3623 meets the slot bottom 3621, thereby prolonging the service life of the flexible screen 32.

Referring to fig. 9 and 10, fig. 9 is a schematic partial cross-sectional structure view of an electronic device according to a fifth embodiment of the present application, and fig. 10 is an enlarged view of a portion X in fig. 9. The structure of the fifth embodiment of the electronic device of the present application is similar to that of the third embodiment, except that: in the fifth embodiment, a rounded corner 3626 is disposed at the intersection of each inner side 3623 and the slot bottom 3621, and stress concentration generated by the flexible screen 32 in the bending process is reduced along with the increase of the radius of the rounded corner 3626, so that the stress distribution tends to be uniform, thereby improving the fatigue safety factor of the flexible display device 30 and prolonging the service life of the flexible screen 32.

In this embodiment, the arc of each rounded corner 3626 is tangent to the bottom surface 3621 of the supporting plate 36 or the inner side surface 3623 of the receiving groove 362, so that the radius value of the rounded corner 3626 at the intersection of the inner side surface 3623 and the bottom surface 3621 is larger.

Referring to fig. 11, fig. 11 is a schematic partial cross-sectional structure 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 third embodiment, except that: in the sixth embodiment, a lubricant coating 39 is provided between the back surface of the protective sheet 34 and the supporting sheet 36 corresponding to the bendable region, that is, the lubricant coating 39 is provided between the back surface of the protective sheet 34 and the groove bottom surface of the receiving groove 362 of the supporting sheet 36 facing the back surface of the protective sheet 34. The lubricant coating 39 may be applied to the back surface of the protective sheet 34, or may be applied to the bottom surface of the receiving groove 362 facing the back surface of the protective sheet 34. When the electronic device 100 is bent or unfolded by the hinge 25, the back surface of the protection sheet 34 and the bottom surface of the receiving groove 364 slide relatively, and the coating layer 39 of the lubricant material is disposed between the back surface of the protection sheet 34 and the bottom surface of the receiving groove 362, so that the friction coefficient between the protection sheet 34 and the supporting sheet 36 can be reduced, and the service life of the flexible screen 32 can be prolonged.

In this embodiment, the lubricant coating 39 is teflon.

In other embodiments, the lubricating material layer may also be graphite, molybdenum disulfide, or thermoplastic polyurethane elastomer rubber, or the like.

Referring to fig. 12, fig. 12 is a schematic partial cross-sectional structure view of an electronic device according to a seventh embodiment of the present application. The structure of the seventh embodiment of the electronic device of the present application is similar to that of the fifth embodiment, except that: in the seventh embodiment, a lubricant coating 39 is provided between the back surface of the protective sheet 34 and the supporting sheet 36 corresponding to the bendable region, that is, the lubricant coating 39 is provided between the back surface of the protective sheet 34 and the groove bottom surface of the receiving groove 362 of the supporting sheet 36 facing the back surface of the protective sheet 34. The lubricant coating 39 may be applied to the back surface of the protective sheet 34, or may be applied to the bottom surface of the receiving groove 362 facing the back surface of the protective sheet 34. When the electronic device 100 is bent or unfolded by the hinge 25, the back surface of the protection sheet 34 and the bottom surface of the receiving groove 364 slide relatively, and the coating layer 39 of the lubricant material is disposed between the back surface of the protection sheet 34 and the bottom surface of the receiving groove 362, so that the friction coefficient between the protection sheet 34 and the supporting sheet 36 can be reduced, and the service life of the flexible screen 32 can be prolonged.

It will be appreciated that in each of the foregoing embodiments, a coating of lubricating material may be disposed between the facing surfaces of the protective sheet and the support sheet, and the coating of lubricating material may be applied to either the protective sheet or the support sheet to reduce friction therebetween.

Referring to fig. 13, fig. 13 is a schematic front structure view of an electronic device in an eighth embodiment of the present application. The structure of the eighth embodiment of the electronic device of the present application is similar to that of the third embodiment, except that: in the eighth embodiment, the front surface of the supporting sheet 36 is opened with a prismatic receiving groove 362 corresponding to the bendable region 31, and the protecting sheet 34 is a prismatic liquid metal sheet received in the prismatic receiving groove 362. One axis of symmetry of the prismatic receiving slot 362 is parallel to the bending axis of the flexible screen 32, and the other axis of symmetry of the prismatic receiving slot 362 is perpendicular to the bending axis of the flexible screen 32. The protective sheet 34 is designed to be prismatic to enhance the resistance to bending of the flexible screen 32.

Referring to fig. 14, fig. 14 is a schematic front structure view of an electronic device in a ninth embodiment of the present application. The ninth embodiment of the electronic device of the present application has a structure similar to that of the eighth embodiment, except that: in the ninth embodiment, the front surface of the supporting piece 36 is opened with an oval receiving groove 362 corresponding to the bendable region 31, and the protection sheet 34 is an oval liquid metal sheet received in the prismatic receiving groove 362.

Referring to fig. 15, fig. 15 is a schematic front structure view of an electronic device in a tenth embodiment of the present application. The structure of the tenth embodiment of the electronic device of the present application is similar to that of the third embodiment, except that: in the tenth embodiment, the front surface of the supporting piece 36 is provided with a plurality of receiving slots 362 spaced from each other corresponding to the bendable region 31, each receiving slot 362 is rectangular, each receiving slot 362 extends along a direction perpendicular to the bending axis of the flexible screen 32, and a rectangular protection sheet 34 is disposed in each receiving slot 362. The protective sheet 34 having a plurality of rectangular shapes can disperse stress when the flexible screen 32 is bent, thereby enhancing the bending resistance of the flexible screen 32.

In the above embodiments, the protection sheet 34 may also be patterned, that is, patterns arranged in an array or in a queue are formed on the protection sheet 34. For example, the protective sheet 34 may include diamond-shaped sheets arranged in an array, with spaces formed between the diamond-shaped sheets and connected by strip-shaped sheets. For another example, the protective sheet 34 may include strip-shaped sheets arranged in a line, each strip-shaped sheet being separated by a gap, and each strip-shaped sheet extending perpendicular to the bending axis of the flexible screen 32. By the patterning, the bending resistance of the protective sheet 34 is increased.

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

It is also understood that the term bend-resistant material as used herein refers to a material that does not break after being bent at least 5000 times.

It will also be understood that the term "relative sliding" as used herein does not limit direct contact and relative sliding between two elements, but may also include spacing relative sliding between third-party elements, which are not limited to solid elements such as sheets, films, etc., but may also include non-solid elements such as gaps, spaces, etc., or a combination of solid and non-solid elements; 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 utility model provides a flexible display device, includes the flexible screen, its characterized in that, the back of flexible screen is range upon range of has the screening glass of being made by resistant material of buckling, the flexible screen is provided with the region of can bending, the screening glass covers the region of can bending, the flexible screen includes the screen layer, the screening glass is used for supporting the screen layer.
The flexible display device of claim 1, wherein a screen body layer is located at a neutral layer position of the flexible display device.
The flexible display device of claim 1, wherein the protective sheet has a hardness greater than a hardness of the screen layer.
The flexible display device according to claim 1, wherein the protective sheet is at least any one of silicone, foam, thin metal sheet, and memory alloy.
The flexible display device of claim 1, wherein the protective sheet is a sheet of liquid metal.
The flexible display device according to claim 5, wherein the liquid metal sheet is an alloy material of at least one of copper, titanium, iron, zirconium, silver, nickel, gallium, gold, antimony, cadmium, zinc, indium, silicon.
The flexible display device of claim 5, wherein the difference between the modulus of elasticity of the liquid metal sheet and the modulus of elasticity of the flexible screen is less than or equal to 100 GPa.
The flexible display device according to claim 1, wherein the back surface of the protective sheet is provided with a support sheet made of a bend-resistant material, and an area between the protective sheet and the support sheet corresponding to the bendable area is relatively slidable.
The flexible display device according to claim 8, wherein a gap is provided between the back surface of the protective sheet and the support sheet in an area corresponding to the bendable region.
The flexible display device of claim 8, wherein the support sheet has a thickness greater than or equal to a thickness of the protective sheet, and the support sheet has a strength greater than a strength of the protective sheet.
The flexible display device according to claim 8, wherein the front surface of the support piece has a receiving groove corresponding to the bendable region, and the protection sheet is slidably received in the receiving groove.
The flexible display device of claim 1, wherein the front surface of the protective sheet is fixedly attached to the back surface of the flexible screen by glue.
The flexible display device according to claim 11, wherein a length of the receiving groove extending in a direction perpendicular to the bending axis of the flexible panel is greater than a length of the protective sheet extending in a direction perpendicular to the bending axis of the flexible panel.
The flexible display device according to claim 11, wherein a thickness of the receiving groove is greater than or equal to a thickness of the protective sheet.
The flexible display device according to claim 11, wherein the receiving groove comprises a groove bottom surface facing the protective sheet, and two opposite inner side surfaces.
A flexible display device according to claim 15, wherein each inner side is provided with a chamfer at the intersection with the bottom surface of the slot.
The flexible display device of claim 16, wherein the chamfer is a fillet.
The flexible display device of claim 17, wherein the arc of the fillet is tangent to a groove bottom surface of the support sheet.
A flexible display device as claimed in claim 18, wherein each inner side face is parallel to the bending axis of the flexible screen.
The flexible display device according to claim 8, wherein the supporting sheet has a prismatic, oval or rectangular receiving slot corresponding to the bendable region, and the protection sheet has a prismatic, oval or rectangular shape corresponding to the receiving slot.
A flexible display device according to claim 9, wherein a coating of a lubricating material is provided between the back surface of the protective sheet and the support sheet corresponding to the bendable regions.
The flexible display device of claim 21, wherein the coating of lubricating material is teflon, graphite, molybdenum disulfide, or a thermoplastic polyurethane elastomer rubber.
An electronic device comprising a housing and the flexible display device according to any one of claims 1 to 22, 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.