CN112602139A

CN112602139A - Electronic device and flexible display device thereof

Info

Publication number: CN112602139A
Application number: CN201880093854.5A
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; WO2019237337A1; WO2019237487A1; CN208922655U; CN112602140A; CN208806016U; WO2019237486A1; CN112513772A; CN112602034A

Abstract

The application provides an electronic device, which comprises a shell (20) and a flexible display device (30), wherein the shell (20) comprises a first frame body (21), a second frame body (23) and a hinge (25) connected between the first frame body (21) and the second frame body (23), and the flexible display device (30) is arranged on the first frame body (21), the second frame body (23) and the hinge (25). Flexible display device (30) is including being provided with flexible screen (32) on screen layer (322), and flexible screen (32) are including region (31) of can bending, the front of flexible screen (32) is range upon range of has apron layer (325), the back of flexible screen (32) is range upon range of has protective layer (35), and the front of flexible screen (32) is the display surface, and the back of flexible screen (32) is the surface opposite with the front. The application also provides a flexible display device of the electronic device.

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

The existing flexible screen generally adopts an organic film material as a substrate, and when the flexible screen is assembled on a shell of an electronic device, the substrate of the flexible screen is contacted with a hinge of the shell. However, when the electronic device is bent or flattened through the hinge, the substrate and the hinge may slide relatively to each other and rub against each other, and thus, the substrate may be easily damaged, and the function of the flexible screen may be 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 the flexible screen that is provided with the flexible on screen layer, the flexible screen is including the region of can bending, the front of flexible screen is range upon range of has the apron layer, the back of flexible screen is range upon range of has the protective layer, and the front of flexible screen is the display surface, and the back of flexible screen is the surface opposite with the front.

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 which is provided with a screen body layer and comprises a bendable area, a cover plate layer is stacked on the front side of the flexible screen, a protective layer is stacked on the back side of the flexible screen, the front side of the flexible screen is a display surface, and the back side of the flexible screen is a surface opposite to the front side.

The protection layer is arranged on the back face of the flexible screen of the electronic device, and the thickness and/or the elastic modulus of the cover plate layer and/or the protection layer are/is adjusted, so that when the flexible screen is bent along the bendable region, the screen body layer of the flexible screen is located at the neutral layer position of the flexible display device, the stress borne by the screen body layer is less, the bending resistance of the screen body layer is improved, and the service life of the flexible screen is prolonged; secondly, because the protective layer is located between the flexible screen and the hinge, the protective layer has a protective effect on the flexible screen, and therefore, the back of the flexible screen cannot be abraded in the process of bending or flattening the electronic device.

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

Fig. 5 is a schematic partial cross-sectional structural diagram of an electronic device in a fourth 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 includes a flexible screen 32, a cover plate layer 34 disposed on a front surface of the flexible screen 32 and a protective layer 35 disposed on a rear surface of the flexible screen 32. The flexible screen 32 is provided with a bendable area 31 corresponding to the hinge 25. The flexible screen 32 includes a screen layer 322 and a touch layer 325, and the touch layer 325 is fixedly attached to the front surface of the screen layer 322 by the adhesive layer 324. The screen layer 322 is the main body of the display image. 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 screen layer 322 is located at a neutral layer position of the flexible display device 30 during the bending of the flexible display device 30 to improve the bending resistance of the screen layer 322. The protective layer 35 is a wear-resistant sheet, the protective layer 35 covers the bendable region 31, and the protective layer 35 is used for protecting the flexible screen 32 and the laminated material layer on the back surface thereof, and preventing the areas of the flexible screen 32 and the laminated material layer corresponding to the bendable region 31 from being worn. 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 located on the neutral layer. 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 layers of the bendable region 31 of the flexible display device 30. When the flexible screen 32 is bent, the cover plate layer 34 and the protective layer 35 are also bent along with the flexible screen 32, and the cover plate layer 34 or the protective layer 35 may be used as a reference layer, where the distance from the reference layer to the neutral layer should satisfy Yn (∑ (Ti × Ei Yi))/(Σ (Ti × Ei)), Yn is the distance from the reference layer to the neutral layer, Ti is the corresponding layer thickness of the flexible display device, Ei is the corresponding layer elastic modulus of the flexible display device, Yi is the distance from the reference layer to the geometric center of the corresponding component layer, and i is the corresponding number of layers. In this embodiment, the passivation layer 35 may be a silicon gel, a foam, a thin metal sheet such as a copper foil, a liquid metal sheet, a memory alloy, or other suitable materials. 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 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 as it is crystallized out of order in the crystal lattice, and is also referred to as an amorphous alloy, liquid metal or metallic glass, since 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.

In this embodiment, the protection layer 35 is a liquid metal protection layer, and the thickness of the liquid metal protection layer is 5 micrometers to 200 micrometers (inclusive). The elastic modulus difference between the liquid metal protective layer and the flexible screen is less than 100 Gpa.

In this embodiment, the front surface of the protection layer 35 is attached to the back surface of the flexible screen 32, and the back surface of the protection layer 35 is attached to the hinge 25. Specifically, the back surface of the flexible screen 32 is fixedly attached to the front surface of the protective layer 35, and the protective layer 35 is slidably connected to the hinge 25. When the electronic device 100 is bent or unfolded by the hinge 25, the back surface of the protection layer 35 slides relative to the hinge 25 corresponding to the region 31, and the screen layer 322 is located at the neutral layer position of the flexible display device 30.

The flexible screen 32 is further provided with a non-bending area connected to the bendable area 31, the protective layer 35 covers the non-bending area on the back surface of the flexible screen 32, and the full-covering mode can avoid the situation that the flexible screen 32 is wrinkled or has poor appearance due to the difference of sections on the two opposite sides of the protective layer 35.

In other embodiments, the protection layer 35 may cover only the region of the bendable region 31 to save the manufacturing cost.

In this embodiment, the reason why the liquid metal sheet is selected as the protective layer 35 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 by means of optical cement or the like, the liquid metal sheet can not only support the flexible screen 32, but also effectively resist friction generated by the hinge 25, and is not easy to wear. On the other hand, the liquid metal sheet has a lower elastic modulus than common metals (such as steel sheets, aluminum sheets, iron sheets, etc.), 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 a large difference in stretching amplitude when being bent. In addition, 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 32.

In other embodiments, the protection layer 35 may be a soft wear-resistant plastic sheet, a soft wear-resistant rubber sheet, or a soft silicone sheet.

The elastic modulus of the protective layer 35 is greater than that of the flexible screen 32, and specifically, the thickness of the protective layer 35 ranges from 5 micrometers to 80 micrometers (inclusive).

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 protection layer 35 is arranged on the back surface of the flexible screen 32 of the electronic device 100, and by adjusting the thickness and/or the elastic modulus of the cover plate layer 34 and/or the protection layer 35, when the flexible screen 32 is bent along the bendable region 31, the screen body layer 322 of the flexible screen 32 is located at the neutral layer position of the flexible display device 30, and 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; secondly, since the protection layer 35 is located between the flexible screen 32 and the hinge 25, that is, the protection layer 35 has a protection effect on the flexible screen 32, the back surface of the flexible screen 32 is not worn in the process of bending or flattening the electronic device 100, so that the function of the flexible screen 32 is not affected; in addition, the protective layer 35 has rigidity and can support the flexible screen 32.

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 flexible screen 32 is fixedly attached to the slider 214, the other end of the back surface of the flexible screen 32 is fixedly attached to the region of the front surface of the protective layer 35 corresponding to the second frame 23, and the middle portion of the back surface of the flexible screen 32 is fixedly attached to the front surface of the protective layer 35. One end of the back surface of the protective layer 35 is fixed to the second frame 23, and a partial region of the back surface of the protective layer 35 and the hinge 25 are slidable relative to each other. The back surface of the protection layer 35 is not fixedly attached to the hinge 25, that is, the back surface of the protection layer 35 is in sliding contact with the hinge 25 in the region of the bendable region 31, so that the flexible display device 30 can be bent and flattened. 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 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. When the electronic device 100 is bent or unfolded through the hinge 25, the region between the back surface of the protective layer 35 and the hinge 25 corresponding to the bendable region 31 slides relatively, and the protective layer 35 has a protective effect on the flexible screen 32, so that the protective layer 35 can prevent the hinge 25 from abrading the flexible screen 32. At this time, the panel body layer 322 of the flexible panel 32 is located at a neutral layer position of the flexible display device 30, thereby improving the bending resistance of the flexible display device 30.

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.

Further, the back of the flexible screen 32 may also be provided with a light-shielding black glue layer, and the protective layer 35 is fixedly attached to the back of the light-shielding black glue layer of the flexible screen 32, so as to prevent or reduce the abrasion of the light-shielding black glue layer of the flexible screen 32.

The cover plate layer 34 is a transparent, flexible and bendable sheet, in this embodiment, the cover plate layer 34 is ultra-thin glass, and the thickness of the ultra-thin glass cover plate is micron-sized.

The reason why the ultra-thin glass is selected as the cover plate layer 34 in this embodiment is that the ultra-thin glass cover plate has the advantages of better bending resistance, high strength, high hardness and the like, and when the ultra-thin glass cover plate is attached to the front surface of the flexible screen 32, the ultra-thin glass cover plate can not only bend or flatten along with the flexible screen 32, but also can effectively resist the scratch of the ultra-thin glass cover plate 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, ultra-thin glass cover plate also can not appear discolouring scheduling problem.

Preferably, the thickness of the ultra-thin glass cover plate layer 34 ranges from 5 microns to 80 microns inclusive.

The elastic modulus of the ultra-thin glass is close to that of the liquid metal (the difference between the two is less than or equal to 50GPa), so that the screen body layer can be positioned at the position of the neutral layer by adjusting the thicknesses of the two. In the present application, if the thickness and the elastic modulus of the cover plate layer 34 are set to be t1 and E1, respectively, and the thickness and the elastic modulus of the protection layer 35 are set to be t2 and E2, respectively, when the cover plate layer 34 and the protection layer 35 have the same elastic modulus, i.e., E1 ≈ E2, the thicknesses of the cover plate layer 34 and the protection layer 35 should be set to satisfy 2t1 ≈ t 2; of course, it is also possible to ensure that the screen layer is in the neutral position by adjusting the elastic modulus of the ultra-thin glass and the liquid metal, and when the cover plate layer 34 is equal to the thickness of the protective layer 35, i.e. t1 ≈ t2, the elastic modulus of the cover plate layer 34 and the protective layer 35 should be set to satisfy 2.5E1 ≈ E2. Therefore, the screen layer 322 can be ensured to be at the position of the neutral layer, and the screen layer is prevented or reduced from being damaged by stress when being bent. Furthermore, the terms "equivalent" and "approximately equal to (≈)" indicate that the difference between the previous and subsequent values is less than or equal to 20%, i.e., E1 ≈ E2 indicates |. E1-E2 |/(the smaller values in E1 and E2) is less than or equal to 20%, and other expressions can refer to the above expressions.

Because the elastic modulus of the ultrathin glass is far greater than that of the flexible screen, if the ultrathin glass is directly attached to the flexible screen, the screen body layer cannot be adjusted to the position of the neutral layer due to the large elastic modulus difference. Therefore, liquid metal with the elastic modulus close to that of the ultrathin glass is further added to the bottom of the flexible screen, and the overlarge elastic modulus of the ultrathin glass is offset by the liquid metal, so that the screen body layer is easily adjusted to the position of the neutral layer.

In other embodiments, the cover sheet layer 34 may also be a flexible transparent cover sheet, such as a transparent PET film layer. Because of the large difference between the elastic moduli of the flexible membrane layer and the liquid metal, the screen body layer can be brought to or near the neutral layer in another way. In this embodiment, the front surface of the protective layer 35 is attached to the back surface of the flexible screen 32 through a colloid 36, the storage modulus value of the colloid 36 is greater than or equal to 50KPa, and the glass transition temperature of the colloid 36 is less than or equal to-20 ℃.

Referring to fig. 3, fig. 3 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, a supporting film 37 is disposed between the front surface of the protective layer 35 and the back surface of the flexible screen 32, and the front surface of the supporting film 37 is attached to the back surface of the flexible screen 32 by an optical back adhesive, that is, the supporting film 37 covers the entire back surface of the flexible screen 32. After the flexible display device 30 is provided with the supporting film 37, the thickness and/or the elastic modulus of the cover plate layer 34, the protective layer 35 and the supporting film 37 are/is adjusted to make the screen layer 322 of the flexible screen 32 still located at the neutral layer position of the flexible display device 30. The support film 37 may be a PET film, a PI film, a PC film, or the like.

In this embodiment, the front surface of the protection layer 35 is fixedly attached to the back surface of the support film 37, the back surface of the protection layer 35 is in sliding contact with the hinge 25, and when the electronic device 100 is bent or unfolded through the hinge 25, the back surface of the protection layer 35 and the hinge 25 slide relatively. Since the protective layer 35 and the support film 37 both have a protective effect on the flexible screen 32, the electronic device 100 does not wear down the flexible screen 32 when being bent or flattened; in addition, the screen layer 322 is always located at the neutral layer position of the flexible display device 30, so that the bending resistance of the flexible screen 32 can be improved, and the service life of the flexible display device 30 can be prolonged.

Referring to fig. 4, fig. 4 is a schematic partial cross-sectional structure view 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 second embodiment, except that: in the third embodiment, the front surface of the protective layer 35 is attached to the back surface of the supporting film 37 through a glue 39, the back surface of the protective layer 35 is in sliding contact with the front surface of the supporting sheet 38 in the area corresponding to the bendable region 31, and the back surface of the supporting sheet 38 is fixedly connected to the hinge 25. When the electronic device 100 is bent or unfolded through the hinge 25, the front surface of the supporting sheet 38 and the back surface of the protective layer 25 slide relative to each other corresponding to the bendable region 31, and at this time, the screen layer 322 is always located at the neutral layer position of the flexible display device 30. The support sheet 38 has an elastic modulus larger than that of the protective layer 35. In this embodiment, the support plate 38 is made of a stainless steel plate.

Referring to fig. 5, fig. 5 is a schematic partial cross-sectional structure 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 third embodiment, except that: in the fourth embodiment, a receiving groove 382 is formed in a region of the front surface of the supporting piece 38 corresponding to the bendable region 31, an opening area of the receiving groove 382 is greater than or equal to that of the region of the bendable region 31, and the protection layer 35 is received in the receiving groove 382. The length of the receiving groove 382 extending in a direction perpendicular to the bending axis of the flexible panel 32 is greater than the length of the protective layer 35 extending in a direction perpendicular to the bending axis of the flexible panel 32, so that the protective layer 35 can slide in the receiving groove 382.

In this embodiment, the front surface of the protection layer 35 is fixedly attached to the back surface of the support film 37 through a glue 39, the back surface of the support sheet 38 is fixedly connected to the hinge 25, the first frame 21, and the second frame 23, and the receiving groove 382 of the support sheet 38 faces the inner surface of the flexible panel 32 and is slidable relative to the back surface of the protection layer 35. When the electronic device 100 is bent or flattened by the hinge 25, the protection layer 35 slides in the receiving groove 382.

In other embodiments, a receiving groove is formed on the back surface of the supporting film 37 corresponding to the bendable region 31, the protective layer 35 is fixedly received in the receiving groove, and the back surface of the protective layer 35 contacts the front surface of the supporting film 37. The area corresponding to the bendable region 31 between the back surface of the protection layer 35 and the front surface of the support sheet 38 slides relatively, and when the electronic device 100 is bent or unfolded by the hinge 25, the area corresponding to the bendable region 31 between the back surface of the protection layer 35 and the front surface of the support sheet 38 slides.

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 utility model provides a flexible display device, is including the flexible screen that is provided with the flexible on screen layer, and the flexible screen is including the region of can bending, its characterized in that, the front of flexible screen is range upon range of has the apron layer, the back of flexible screen is range upon range of has the protective layer, and the front of flexible screen is the display surface, and the back of flexible screen is the surface opposite with the front.
The flexible display device of claim 1, wherein the protective layer has a modulus of elasticity less than the modulus of elasticity of metallic iron, metallic aluminum, and metallic steel.
The flexible display device of claim 1, wherein the difference between the modulus of elasticity of the protective layer and the modulus of elasticity of the flexible screen is less than 100 Gpa.
The flexible display device of claim 1, wherein the protective layer comprises at least any one of a silicon gel, a foam, a thin metal sheet, and a memory alloy.
The flexible display device of claim 1, wherein the protective layer is a liquid metal layer.
The flexible display device according to claim 5, wherein the liquid metal layer is an alloy material of at least one of copper, titanium, iron, zirconium, silver, nickel, gallium, gold, antimony, cadmium, zinc, indium, and silicon.
The flexible display device of claim 1, wherein the screen layer is located at or near a neutral layer of the flexible display device.
The flexible display device of claim 7, wherein the cover plate layer and the protective layer are both bendable with the flexible screen, and the cover plate layer or the protective layer is selected as a reference layer, and the distance from the reference layer to the neutral layer satisfies Yn (∑ (Ti × Ei) Yi))/(Σ (Ti × Ei)), where Ti is the corresponding layer thickness of the flexible display device, Ei is the corresponding layer elastic modulus of the flexible display device, and Yi is the distance from the reference layer to the geometric center of the corresponding assembly layer.
The flexible display device according to claim 1, wherein the cover layer has a thickness and a modulus of elasticity t1 and E1, respectively, and the protective layer has a thickness and a modulus of elasticity t2 and E2, respectively, and the cover layer and the protective layer have a thickness satisfying 2t1 and t2 when the cover layer and the protective layer have the same modulus of elasticity.
The flexible display device according to claim 1, wherein the cover layer has a thickness and a modulus of elasticity t1 and E1, respectively, and the passivation layer has a thickness and a modulus of elasticity t2 and E2, respectively, and the cover layer and the passivation layer have moduli of elasticity satisfying 2.5E1 and E2, respectively, when the cover layer and the passivation layer have the same thickness.
The flexible display device of claim 1, wherein the cover plate layer is ultra-thin glass.
The flexible display device according to claim 11, wherein the ultra-thin glass has a modulus of elasticity close to that of the protective sheet.
The flexible display device of claim 11, wherein the ultra-thin glass has a thickness greater than or equal to 5 microns and less than or equal to 80 microns.
The flexible display device of claim 1, wherein a gel is disposed between the protective layer and the flexible screen, wherein the gel has a storage grind value of greater than or equal to 50KPa and a glass transition temperature of less than or equal to-20 ℃.
The flexible display device of claim 1, wherein the protective layer covers the bendable region.
The flexible display device of claim 1, wherein the protective layer covers an entire back surface of the flexible screen.
The flexible display device according to any of claims 1-16, wherein a support film is arranged between the protective layer and the flexible screen, the support film covering a back side of the flexible screen.
The flexible display device of claim 1, wherein a back surface of the protective layer is laminated with a support sheet, and an area corresponding to the bendable area between the protective layer and the support sheet is relatively slidable.
The flexible display device of claim 18, wherein the support sheet has a modulus of elasticity greater than a modulus of elasticity of the protective layer.
The flexible display device of claim 18, wherein a receiving groove is formed on a front surface of the support sheet corresponding to the bendable region, the protective layer is received in the receiving groove, and the protective layer slides in the receiving groove when the flexible screen is bent.
An electronic device comprising a housing and the flexible display device according to any one of claims 1 to 20, 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.