WO2019237486A1

WO2019237486A1 - Electronic apparatus and flexible display apparatus thereof

Info

Publication number: WO2019237486A1
Application number: PCT/CN2018/099723
Authority: WO
Inventors: 刘亮; 施文杰; 张琨; 陈松亚
Original assignee: 深圳市柔宇科技有限公司
Priority date: 2018-06-15
Filing date: 2018-08-09
Publication date: 2019-12-19
Also published as: CN112602034A; CN112639922A; WO2019237484A1; WO2019237485A1; CN112602140A; CN208922655U; CN112513772A; WO2019237337A1; WO2019237487A1; CN112602139A; CN208806016U

Abstract

Provided in the present application is an electronic apparatus, which comprises a shell (20) and a flexible display apparatus (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 apparatus (30) is arranged on the the first frame body (21), the second frame body (23) and the hinge (25), the flexible display apparatus (30) comprises a bendable flexible screen (32) provided with a screen body layer (322), the flexible screen (32) comprises a bendable area (31), a front side of the flexible screen (32) is stacked with a cover plate layer (325), a rear side of the flexible screen (32) is stacked with a protective layer (35), the front side of the flexible screen (32) is a display side, and the rear side of the flexible screen (32) is a surface opposite the front side. Further provided in the present application is a flexible display apparatus of the electronic apparatus.

Description

Electronic device and flexible display device

Technical field

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

Background technique

At present, the flexible screen generally uses an organic film material as a substrate. When the flexible screen is assembled on a casing of an electronic device, the substrate of the flexible screen is in contact with a hinge of the casing. However, when the electronic device is bent or flattened through the hinge, the substrate and the hinge may slide relative to each other to cause friction, so it is easy to cause damage to the substrate and affect the function of the flexible screen.

Summary of the Invention

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

A flexible display device provided by the present application includes a flexible flexible screen provided with a screen body layer, the flexible screen includes a bendable area, a front layer of the flexible screen is laminated with a cover layer, and a back surface of the flexible screen is laminated There is a protective layer, the front of the flexible screen is the display surface, and the back of the flexible screen is the surface opposite to the front.

The present application also provides an electronic device including a housing and a flexible display device. The housing includes a first frame body, a second frame body, and a first frame body connected between the first frame body and the second frame body. A hinge, and the flexible display device is disposed on the first frame body, the second frame body, and the hinge. The flexible display device includes a flexible flexible screen provided with a screen body layer. The flexible screen includes a bendable area. A cover layer is laminated on a front surface of the flexible screen, and a protective layer is laminated on a rear surface of the flexible screen. The front of the screen is the display surface, and the back of the flexible screen is the surface opposite to the front.

A protective layer is provided on the back of the flexible screen of the electronic device of the present application, and by adjusting the thickness and / or the elastic modulus of the cover layer and / or the protective layer, the flexible screen can be made along the foldable When the bending area is bent, the screen body layer of the flexible screen is located at the neutral layer position of the flexible display device, and the screen body layer receives less stress, thereby improving the bending resistance of the screen body layer. Increase the service life of the flexible screen; 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, so the back of the flexible screen The electronic device is not worn during bending or flattening.

BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

FIG. 3 is a partial cross-sectional structure diagram of an electronic device in a second embodiment of the present application.

FIG. 4 is a partial cross-sectional structural diagram of an electronic device in a third embodiment of the present application.

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

detailed description

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

In the description of the embodiment of the present invention, it should be understood that the orientations or positional relationships indicated by the terms “up”, “down”, “left”, and “right” are based on the orientations or positional relationships shown in the drawings, and are for convenience only. Describing the invention and simplifying the description, rather than implying or indicating that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

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

Please refer to FIG. 1 and FIG. 2 together. FIG. 1 is a schematic diagram of the three-dimensional structure of the electronic device in the first embodiment of the present application; FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. The electronic device 100 in the first embodiment of the present application includes a casing 20 and a flexible display device 30 disposed on the casing 20. The casing 20 includes a first frame body 21, a second frame body 23, and a hinge 25 connected between the first frame body 21 and the second frame body 23. The flexible display device 30 includes a flexible screen 32, a cover layer 34 having flexibility provided on a front surface of the flexible screen 32, and a protective layer 35 having flexibility provided on a back 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 body layer 322 and a touch layer 325. The touch layer 325 is fixed and adhered to the front surface of the screen body layer 322 through an adhesive layer 324. The screen body layer 322 is a main body for displaying an image. When the electronic device 100 is bent through the hinge 25, the flexible display device 30 is bent along the bendable area 31. During the bending of the flexible display device 30, the screen body layer 322 is located at the The position of the neutral layer of the flexible display device 30 is to improve the bending resistance of the screen body layer 322. The protective layer 35 is a wear-resistant sheet, and the protective layer 35 covers the bendable area 31. The protective layer 35 is used to protect the flexible screen 32 itself and the laminated material layer on the back thereof to prevent the flexibility. The area of the screen 32 and the laminated layer corresponding to the bendable area 31 is worn. The front side of the flexible screen 32 refers to a light emitting surface of the flexible screen 32, and the back side of the flexible screen 32 refers to a surface facing away from the light emitting surface.

The neutral layer refers to a process in which the flexible display device 30 is bent, the outer layer of the flexible display device 30 is stretched, the inner layer of the flexible display device 30 is squeezed, and a cross section is not stretched. The transition layer is stretched without being squeezed, and the stress of the transition layer is small, and the transition layer is a neutral layer. The screen layer 322 in the present application is located on the neutral layer. The position of the neutral layer of the flexible display device 30 can be determined by adjusting the elastic modulus and / or thickness of each layer of the bendable region 31 of the flexible display device 30. When the flexible screen 32 is bent, the cover layer 34 and the protective layer 35 are also bent along with the flexible screen 32. The cover layer 34 or the protective layer 35 may be selected as a reference layer. The reference layer The distance 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, and Ti is the corresponding value of the flexible display device. Layer thickness, Ei is the elastic modulus of the corresponding layer 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 protective layer 35 may be silicone, foam, thin metal sheet such as copper foil, liquid metal sheet, memory alloy or other compatible materials. More preferably, a liquid metal sheet is used. The liquid metal sheet may be an alloy of one or more of copper, titanium, iron, zirconium, silver, nickel, gallium, gold, antimony, cadmium, zinc, indium, silicon, and the like. Materials, specifically metals, can preferably achieve lower elastic modulus, hardness, elongation and other mechanical properties.

The liquid metal referred to in the present invention refers to heating the alloy to a molten state, and then cooling it at an ultra-fast cooling rate, so that the alloy crystal lattice solidifies before it can be arranged in order. Because it is in an amorphous state, like glass, it is also called non- Crystal alloy, liquid metal or metallic glass. The characteristics of liquid metal are long-range disorder (short-range order), metastable state, to some extent isotropic physical properties, no exact melting point, glass transition temperature point, etc., which has the characteristics of solid, metal, and glass. Under certain conditions, it has high strength, high hardness, plasticity, heat conduction and wear resistance. That is, the liquid metal referred to in the present invention is substantially solid at normal temperature, but some of its characteristics are close to liquid, so it is called liquid metal.

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

In this embodiment, the front surface of the protective layer 35 is attached to the back of the flexible screen 32, and the back surface of the protective layer 35 is attached to the hinge 25. Specifically, a back surface of the flexible screen 32 and a front surface of the protective layer 35 are fixedly attached, and the protective layer 35 and the hinge 25 are slidingly connected. When the electronic device 100 is bent or flattened through the hinge 25, the back surface of the protective layer 35 and the area of the hinge 25 corresponding to the bendable area 31 slide relative to each other, and the screen body layer 322 is located at The position of the neutral layer of the flexible display device 30.

The flexible screen 32 is also provided with a non-bent area connected to the bendable area 31, and the protective layer 35 covers the non-bent area of the back of the flexible screen 32. This full covering method can be avoided Steps appear on opposite sides of the protective layer 35, resulting in wrinkles or poor appearance of the flexible screen 32.

In other embodiments, the protective layer 35 may cover only the area of the bendable area 31 to save manufacturing costs.

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 abrasion resistance. When the liquid metal sheet is attached to the back of the flexible screen 32 by means such as optical glue, it can not only support the flexible screen. 32, and can effectively resist the friction caused by the hinge 25, which is not prone to wear. On the other hand, the elastic modulus of the liquid metal sheet is lower than that of common metals (such as steel sheet, aluminum sheet, iron sheet, etc.), which can be directly pasted on the back of the flexible screen 32 and bent on the flexible display device 30 The flexible screen 32 can be stretched synchronously or approximately synchronously with the flexible screen 32 to avoid breakage of the flexible display device 30 due to a large difference in stretching amplitude during bending. In addition, compared with existing materials with lower elastic modulus, such as silicone, foam, plastic, etc., the strength of the liquid metal is higher, and the abrasion resistance is better, which can effectively support the flexible screen 32.

In other embodiments, the protective 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 the elastic modulus of the flexible screen 32. 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 can be understood that, in other embodiments, the electronic device 100 may be, but is not limited to, a PDA of a radio telephone, a pager, a web browser, a notepad, a calendar, and / or a global positioning system (GPS) receiver.

A protective layer 35 is provided on the back of the flexible screen 32 of the electronic device 100 of the present application, and the flexible screen 32 can be adjusted by adjusting the thickness and / or the elastic modulus of the cover layer 34 and / or the protective layer 35. When bending along the bendable area 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 receives less stress, thereby improving The bending resistance of the screen body layer 322 increases the service life of the flexible screen 32; secondly, because the protective layer 35 is located between the flexible screen 32 and the hinge 25, that is, the protection The layer 35 has a protective effect on the flexible screen 32. Therefore, the back surface of the flexible screen 32 will not be worn during the bending or flattening of the electronic device 100. Therefore, the flexible screen 32 can be ensured. The function is not affected; in addition, the protective layer 35 is also rigid and can play a role of supporting the flexible screen 32.

A guide groove 212 is provided at an end of the first frame body 21 remote from the second frame body 23. A slide block 214 is slidably disposed in the guide slide groove 212. The slide block 214 and the first frame An elastic member 216 is disposed between the bodies 21 along the sliding direction of the slider 214. In this embodiment, one end of the back of the flexible screen 32 is fixedly attached to the slider 214, and the other end of the back of the flexible screen 32 is fixedly attached to the front of the protective layer 35 corresponding to the first In the area of the two frames 23, 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 fixedly attached to the second frame body 23. A partial area on the back surface of the protective layer 35 and the hinge 25 can slide relative to each other. The back surface of the protective layer 35 and the hinge 25 are not fixedly attached, that is, the back surface of the protective layer 35 and the hinge 25 are in sliding contact with each other in the region of the bendable area 31 so as to facilitate The flexible display device 30 is bent and flattened. The elastic member 216 elastically pushes the slider 214 to slide toward an end away from the second frame body 23 to straighten the flexible screen 32 to prevent the electronic device 100 from being bent / flattened. The area of the flexible screen 32 corresponding to the bendable area 31 is separated from the hinge 25 and arched. When the electronic device 100 is bent or flattened through the hinge 25, a region between the back surface of the protective layer 35 and the hinge 25 corresponding to the bendable area 31 is relatively slid, because the protective layer 35 The flexible screen 32 has a protective effect. Therefore, the protective layer 35 can prevent the hinge 25 from abrading the flexible screen 32. At this time, the screen body layer 322 of the flexible screen 32 is located at the 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 be provided with a light-shielding black adhesive layer, and the protective layer 35 is fixedly attached to the back of the light-shielding black adhesive layer of the flexible screen 32 to prevent or reduce the flexibility of the flexible screen 32. The black masking layer is worn.

The cover layer 34 is a light-transmissive, flexible and bendable sheet. In this embodiment, the cover layer 34 is ultra-thin glass, and the thickness of the ultra-thin glass cover sheet is in the micron order.

The reason why the ultra-thin glass is used as the cover layer 34 in this embodiment is that the ultra-thin glass cover sheet has advantages such as better bending resistance, high strength, and high hardness. When the ultra-thin glass cover sheet is attached to the flexible screen 32 On the front side, the ultra-thin glass cover sheet can not only be bent or flattened with the flexible screen 32, but also can effectively resist external objects from scratching the ultra-thin glass cover sheet, which is not prone to wear. Secondly, the ultra-thin glass cover sheet has a low modulus of elasticity, and can be directly stuck on the front surface of the flexible screen 32. When the flexible display device 30 is bent, the flexible display device 30 can be synchronized or stretched along with the flexible screen 32 to avoid flexible display. When the device 30 is bent, it may be damaged due to a large difference in the stretching amplitude. On the other hand, the ultra-thin glass cover sheet has a high light transmittance, which facilitates the emission of light from the flexible screen 32, and the ultra-thin glass cover sheet does not cause problems such as discoloration after long-term use.

Preferably, the thickness of the ultra-thin glass cover layer 34 is between 5 microns and 80 microns (inclusive).

The elastic modulus of ultra-thin glass is relatively close to that of liquid metal (the so-called proximity in the present invention can be understood as the difference between the two is less than or equal to 50 Gpa), so the thickness of the two can be adjusted to make the screen body layer in the middle Location of sexual layers. In this application, if the thickness and elastic modulus of the cover layer 34 are set to t1 and E1, respectively, and the thickness and elastic modulus of the protective layer 35 are t2 and E2, respectively, when the cover layer 34 and When the elastic modulus of the protective layer 35 is equal, that is, E1≈E2, the thickness of the cover layer 34 and the protective layer 35 should be set to satisfy 2t1≈t2; of course, it can also be adjusted by ultra-thin glass and liquid metal. To ensure that the screen body layer is in the neutral layer position. When the thickness of the cover layer 34 and the protective layer 35 are equivalent, that is, t1 ≈ t2, the cover layer 34 and the protection should be provided. The elastic modulus of the layer 35 satisfies 2.5E1≈E2. Therefore, the screen body layer 322 can be ensured to be in the position of the neutral layer, and the screen body layer 322 can be prevented or reduced from being damaged by stress during bending. Further, the terms "equivalent" and "approximately equal to (≈)" in the present invention indicate that the ratio of the difference between the values before and after is less than or equal to 20%, that is, E1≈E2 means ∣E1-E2∣ / (the values in E1 and E2 are smaller ()) Less than or equal to 20%, other expressions can also refer to the above expressions.

Since the elastic modulus of ultra-thin glass is much larger than that of flexible screen, if the ultra-thin glass is directly bonded to the flexible screen, the screen body layer cannot be adjusted to the neutral layer due to the large difference in elastic modulus. s position. Therefore, at the bottom of the flexible screen, a liquid metal with an elastic modulus close to that of ultra-thin glass is further added, and the excessive elastic modulus of ultra-thin glass is offset by the liquid metal, making it easier to adjust the screen body layer to the neutral layer. position.

In other embodiments, the cover layer 34 may also be a flexible transparent cover, such as a transparent PET film layer. Because the difference between the elastic modulus of the flexible film layer and the liquid metal is large, the screen body layer can be placed at or near the neutral layer position by another way. In this embodiment, the front surface of the protective layer 35 and the back surface of the flexible screen 32 are bonded by a gel 36, and the storage modulus value of the gel 36 is greater than or equal to 50 KPa, and the glass transition of the gel 36 The temperature is less than or equal to -20 ° C.

Please refer to FIG. 3. FIG. 3 is a partial cross-sectional structural diagram of an electronic device in a second embodiment of the present application. The structure of the second embodiment of the electronic device of the present application is similar to that of the first embodiment, except that in the second embodiment, between the front surface of the protective layer 35 and the back surface of the flexible screen 32 A support film 37 is provided, and the front surface of the support film 37 is attached to the back surface of the flexible screen 32 through an optical adhesive, that is, the support film 37 covers the entire back surface of the flexible screen 32. After adding the supporting film 37 to the flexible display device 30, the screen body layer 322 of the flexible screen 32 needs to be adjusted by adjusting the thickness and / or elastic modulus of the cover layer 34, the protective layer 35, and the supporting film 37. It is still at the neutral layer position of the flexible display device 30. The supporting film 37 may be a PET film, a PI film, a PC film, or the like.

In this embodiment, the front surface of the protective layer 35 is fixedly attached to the back surface of the support film 37, and the rear surface of the protective layer 35 and the hinge 25 are in sliding contact with each other. When the hinge 25 is bent or flattened, the back surface of the protective layer 35 and the hinge 25 slide relative to each other. Since the protective layer 35 and the supporting film 37 have a protective effect on the flexible screen 32, the electronic device 100 will not wear to the flexible screen 32 when it is bent or flattened; in addition, the The screen body layer 322 is always located at the neutral layer position of the flexible display device 30. Therefore, the flexure resistance of the flexible screen 32 can be improved and the service life of the flexible display device 30 can be extended.

Please refer to FIG. 4. FIG. 4 is a partial cross-sectional structure diagram 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 second embodiment, except that in the third embodiment, the front surface of the protective layer 35 is adhered to the support film through the gel 39. The back surface of 37, the back surface of the protective layer 35 and the front surface of the support sheet 38 are in sliding contact with the area corresponding to the bendable area 31, and the back surface of the support sheet 38 is fixedly connected to the hinge 25. When the electronic device 100 is bent or flattened through the hinge 25, the front surface of the support piece 38 and the back surface of the protective layer 25 slide relative to the bendable area 31. At this time, the The screen body layer 322 is always located at the neutral layer position of the flexible display device 30. The elastic modulus of the support sheet 38 is greater than the elastic modulus of the protective layer 35. In this embodiment, the supporting sheet 38 is made of a stainless steel sheet.

Please refer to FIG. 5. FIG. 5 is a partial cross-sectional structure diagram of an electronic device in a fourth embodiment of the present application. The structure of the fourth embodiment of the electronic device of the present application is similar to that of the third embodiment, except that in the fourth embodiment, the front surface of the support piece 38 corresponds to the area of the bendable area 31 A receiving groove 382 is opened. The opening area of the receiving groove 382 is larger than or equal to the area of the bendable area 31. The protective 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 screen 32 is greater than the length of the protective layer 35 extending in a direction perpendicular to the bending axis of the flexible screen 32 so that the protective layer 35 can slide in the receiving groove 382.

In this embodiment, the front surface of the protective layer 35 is fixedly attached to the back surface of the support film 37 by a gel 39, and the back surface of the support sheet 38 is fixedly connected to the hinge 25, the first frame 21, and On the second frame body 23, the receiving groove 382 of the supporting sheet 38 faces the inner surface of the flexible screen 32 and the back surface of the protective layer 35 can slide relative to each other. When the electronic device 100 is bent or flattened through the hinge 25, the protective layer 35 slides in the receiving groove 382.

In other embodiments, the back of the supporting film 37 is provided with a receiving groove corresponding to the bendable area 31. The protective layer 35 is fixedly received in the receiving groove. The back of the protective layer 35 contacts the supporting sheet. 37 positive. The area between the back surface of the protective layer 35 and the front surface of the support sheet 38 corresponding to the bendable area 31 slides relatively. When the electronic device 100 is bent or flattened through the hinge 25, the protection The back surface of the layer 35 and the front surface of the support sheet 38 slide in the area of the bendable area 31.

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

The above is a preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principles of the present invention, several improvements and retouches can be made. It is the protection scope of the present invention.

Claims

A flexible display device includes a flexible flexible screen provided with a screen body layer. The flexible screen includes a bendable area. The flexible screen is characterized in that a cover layer is laminated on a front surface of the flexible screen and a rear surface of the flexible screen is laminated. There is a protective layer, the front of the flexible screen is the display surface, and the back of the flexible screen is the surface opposite to the front.
The flexible display device according to claim 1, wherein an elastic modulus of the protective layer is smaller than an elastic modulus of metallic iron, metallic aluminum, and metallic steel.
The flexible display device according to claim 1, wherein the difference between the elastic modulus of the protective layer and the elastic modulus of the flexible screen is less than 100 Gpa.
The flexible display device according to claim 1, wherein the protective layer comprises at least any one of silica gel, foam, thin metal sheet, and memory alloy.
The flexible display device according to claim 1, wherein the protective layer is a liquid metal layer.
The flexible display device of claim 5, wherein the liquid metal layer is at least one of copper, titanium, iron, zirconium, silver, nickel, gallium, gold, antimony, cadmium, zinc, indium, and silicon Alloy material.
The flexible display device according to claim 1, wherein the screen body layer is located at or near a neutral layer of the flexible display device.
The flexible display device according to claim 7, wherein the cover layer and the protective layer can be bent along with the flexible screen, and the cover layer or the protective layer is selected as a reference layer, and the reference The distance from the layer to the neutral layer satisfies Yn = (Σ (Ti * Ei * Yi)) / (Σ (Ti * Ei)), where Ti is the corresponding layer thickness of the flexible display device, and Ei is the corresponding layer thickness of the flexible display device. Layer elastic modulus, Yi is the distance from the reference layer to the geometric center of the corresponding component layer.
The flexible display device according to claim 1, wherein the thickness and elastic modulus of the cover layer are set to t1 and E1, respectively, and the thickness and elastic modulus of the protective layer are set to t2 and E2, respectively, When the elastic modulus of the cover layer and the protective layer are equivalent, the thicknesses of the cover layer and the protective layer satisfy 2t1 and t2.
The flexible display device according to claim 1, wherein the thickness and elastic modulus of the cover layer are set to t1 and E1, respectively, and the thickness and elastic modulus of the protective layer are set to t2 and E2, respectively, When the thickness of the cover layer and the protective layer are equivalent, the elastic modulus of the cover layer and the protective layer satisfies 2.5E1 and E2.
The flexible display device according to claim 1, wherein the cover layer is ultra-thin glass.
The flexible display device according to claim 11, wherein an elastic modulus of the ultra-thin glass is close to an elastic modulus of the protective sheet.
The flexible display device according to claim 11, wherein a thickness of the ultra-thin glass is greater than or equal to 5 microns and less than or equal to 80 microns.
The flexible display device according to claim 1, wherein a colloid is provided between the protective layer and the flexible screen, a storage abrasion value of the colloid is greater than or equal to 50KPa, and the glass transition of the colloid is The temperature is less than or equal to -20 ° C.
The flexible display device according to claim 1, wherein the protective layer covers the bendable area.
The flexible display device according to claim 1, wherein the protective layer covers an entire back surface of the flexible screen.
The flexible display device according to any one of claims 1 to 16, wherein a support film is provided between the protective layer and the flexible screen, and the support film covers a back surface of the flexible screen.
The flexible display device according to claim 1, wherein a support sheet is laminated on a back surface of the protective layer, and a region between the protective layer and the support sheet corresponding to the bendable region can slide relatively.
The flexible display device according to claim 18, wherein the elastic modulus of the support sheet is greater than the elastic modulus of the protective layer.
The flexible display device according to claim 18, wherein the front surface of the support sheet is provided with a receiving slot corresponding to the bendable area, the protective layer is received in the receiving slot, and the flexible screen is bent At this time, the protective layer slides in the receiving groove.
An electronic device includes a housing and the flexible display device according to any one of claims 1-20, the housing includes a first frame body, a second frame body, and a connection to the first frame body A hinge between the second frame and the flexible display device is disposed on the first frame, the second frame, and the hinge.