CN113035067A

CN113035067A - Flexible film and display device

Info

Publication number: CN113035067A
Application number: CN202110268062.0A
Authority: CN
Inventors: 杨磊
Original assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Priority date: 2021-03-11
Filing date: 2021-03-11
Publication date: 2021-06-25

Abstract

The embodiment of the invention provides a flexible film and a display device, relates to the field of display, and aims to solve the problem that the flexible film in the display device has poor impact resistance on the premise of considering the bending performance of the flexible film. The flexible film comprises at least two flexible substrate layers and at least one first glue layer. At least two flexible substrate layers are arranged in sequence along the thickness direction of the flexible film, and a first glue layer is arranged between every two adjacent flexible substrate layers and is bonded through the first glue layer. Wherein, the material of the first glue layer is transparent synthetic elastomer.

Description

Flexible film and display device

Technical Field

The invention relates to the field of display, in particular to a flexible film and a display device.

Background

The flexible display device has the characteristic of being bendable and the like, and can realize the bending (including curling, folding and the like) of the display device. For example, the flexible display device includes: display screen and the apron that bonds on the display screen. At present, along with the development of flexible display devices, higher requirements are also put forward on the performance of a cover plate in the flexible display device, and the flexible display device not only needs to meet the requirement of being capable of being bent, but also needs to have high impact resistance so as to meet the protection of a display screen under the cover plate of the display device.

Currently, Colorless Polyimide (CPI) can be used to fabricate the cover plate of the flexible display device. The thinner the thickness of the cover plate is, the better the bending performance is, and on the basis, in order to ensure that the flexible display device has better bending performance, the CPI cover plate is not too thick, but the thin CPI cover plate has poor impact resistance, so that the display screen below the thin CPI cover plate cannot be effectively protected when the thin CPI cover plate is impacted.

Disclosure of Invention

The embodiment of the invention provides a flexible film and a display device, which are used for solving the problem of poor impact resistance of the flexible film in the display device on the premise of considering the bending performance of the flexible film.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

a first aspect provides a flexible film comprising at least two flexible substrate layers and at least one first glue layer. Wherein, two at least flexible substrate layers set gradually along the thickness direction of flexible membrane, are provided with a first glue film between every two adjacent flexible substrate layers, and bond through first glue film. Wherein, the material of the first glue layer is transparent synthetic elastomer.

In some embodiments, the at least one flexible substrate layer has a thickness of 5 μm-10 μm.

In some embodiments, the thickness of the first glue layer is 3 μm-5 μm.

In some embodiments, the number of flexible substrate layers is 2-5.

In some embodiments, the material of the first adhesive layer is a thermoplastic polyurethane elastomer.

In some embodiments, two of the at least two flexible substrate layers located at both ends of the flexible film in the thickness direction are a first flexible substrate layer and a second flexible substrate layer, respectively. The flexible film further comprises a protective layer located on one side, away from the second flexible substrate layer, of the first flexible substrate layer.

In some embodiments, the thickness of the first flexible substrate layer is greatest among the at least two flexible substrate layers.

In some embodiments, the flexible film further comprises a second glue layer located on the side of the second flexible substrate layer away from the first flexible substrate layer, and the material of the second glue layer is optical glue.

A second aspect provides a display device, including a display screen and a cover plate, wherein the cover plate is bonded on a display surface of the display screen, and the cover plate is the flexible film provided in any of the above embodiments.

A third aspect provides a display device including a display screen, a cover plate, and a cover plate film. The cover plate is bonded on the display surface of the display screen, the cover plate film is bonded on the surface of one side, far away from the display screen, of the cover plate, and the cover plate film is the flexible film provided by any one of the embodiments.

According to the embodiment of the invention, every two adjacent flexible base material layers in at least two flexible base material layers are bonded together through the transparent synthetic elastomer to form the flexible film with the laminated structure. Compared with a flexible substrate layer with the same thickness, the flexible film provided by the embodiment of the invention adopts a multilayer laminated structure, so that the thickness of the flexible substrate layer is reduced, and the bending performance of the flexible film is improved. In addition, the impact energy can be absorbed by the elasticity of the first adhesive layer in the laminated structure, so that the display device using the flexible film has good impact resistance on the premise of considering the bending performance.

It is understood that the display device according to the second aspect and the third aspect includes the above-mentioned flexible film, and therefore, the beneficial effects achieved by the display device can refer to the beneficial effects of the above-mentioned flexible film, and the description thereof is omitted.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or the prior art 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 block diagram of a flexible membrane according to an embodiment of the present invention;

fig. 2 is a structural diagram of a flexible film and a structural diagram of a flexible substrate layer having the same thickness as the flexible film according to an embodiment of the present invention;

fig. 3 is a structural diagram of two flexible substrate layers and a first adhesive layer when a flexible film according to an embodiment of the present invention is bent, and a structural diagram of two flexible substrate layers and a first adhesive layer when another flexible film according to an embodiment of the present invention is bent;

FIG. 4 is a schematic diagram of a flexible film bonded using an optical acrylic adhesive to form pits in a pen-down impact using CPI as the flexible substrate layer;

fig. 5 is a structural diagram of a display device according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a pen-down model of a display device according to an embodiment of the present invention;

fig. 7 is a structural diagram of another display device according to an embodiment of the present invention.

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 present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Unless the context requires otherwise, throughout the description and the claims, the term "comprise" and its other forms, such as the third person's singular form "comprising" and the present participle form "comprising" are to be interpreted in an open, inclusive sense, i.e. as "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" and the like are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be included in any suitable manner in any one or more embodiments or examples.

In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present disclosure, "a plurality" means two or more unless otherwise specified.

In describing some embodiments, expressions of "coupled" and "connected," along with their derivatives, may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other. As another example, some embodiments may be described using the term "coupled" to indicate that two or more elements are in direct physical or electrical contact. However, the terms "coupled" or "communicatively coupled" may also mean that two or more elements are not in direct contact with each other, but yet still co-operate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents herein.

"at least one of A, B and C" has the same meaning as "A, B or at least one of C," each including the following combination of A, B and C: a alone, B alone, C alone, a and B in combination, a and C in combination, B and C in combination, and A, B and C in combination.

"A and/or B" includes the following three combinations: a alone, B alone, and a combination of A and B.

"plurality" means at least two.

The use of "adapted to" or "configured to" herein is meant to be an open and inclusive language that does not exclude devices adapted to or configured to perform additional tasks or steps.

Additionally, the use of "based on" means open and inclusive, as a process, step, calculation, or other action that is "based on" one or more stated conditions or values may in practice be based on additional conditions or values beyond those stated.

As used herein, "about," "approximately," or "approximately" includes the stated values as well as average values that are within an acceptable range of deviation for the particular value, as determined by one of ordinary skill in the art in view of the measurement in question and the error associated with measurement of the particular quantity (i.e., the limitations of the measurement system).

Example embodiments are described herein with reference to cross-sectional and/or plan views as idealized example figures. In the drawings, the thickness of layers and regions are exaggerated for clarity. Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, the exemplary embodiments should not be construed as limited to the shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of the exemplary embodiments.

Embodiments of the present invention provide a flexible membrane. Wherein, the flexibility of the product means that the product has the bending performance.

Fig. 1 shows the structure of a flexible membrane. As shown in FIG. 1, in some embodiments, the flexible film 1 includes at least two (M ≧ 2) flexible substrate layers 11 and at least one (N ≧ 1) first glue layer 12, where N ═ M-1. The respective flexible base material layers 11 are sequentially arranged in the thickness direction of the flexible film 1, the thickness direction being parallel to the X direction. A first adhesive layer 12 is arranged between every two adjacent flexible substrate layers 11 and is bonded through the first adhesive layers 12, so that a laminated structure in which the flexible substrate layers 11 and the first adhesive layers 12 are alternately arranged is formed.

In some embodiments, to meet the flexibility and light transmission requirements of the flexible film 1, the material of at least one (e.g., each of the M) flexible substrate layers 11 may be CPI (Clear Polyimide), PET (Polyethylene Terephthalate), or the like. Illustratively, the materials of the different flexible substrate layers may be the same, or different. For example, in the M flexible substrate layers 11, all the flexible substrate layers 11 are made of the same material, such as CPI or PET; alternatively, at least two of the M flexible substrate layers 11 are made of different materials, for example, a part of the flexible substrate layers 11 is CPI, and another part of the flexible substrate layers 11 is PET.

In some embodiments, at least one (e.g., each of the M) of the flexible substrate layers 11 has a thickness of 5 μ M to 10 μ M, at which the flexible substrate layer has good bending properties. Illustratively, the thickness of any one of the flexible substrate layers 11 in the flexible film 1 may be 5 μm, 6 μm, 8 μm, 10 μm, or the like. The thickness of the different flexible substrate layers can be the same or different.

In some embodiments, the material of the first adhesive layer 12 is a transparent synthetic elastomer. Illustratively, the transparent synthetic elastomer is one of silicone rubber, modified silicone rubber, acrylate rubber, and urethane rubber. These synthetic elastomers are transparent so that the flexible film realizes optical characteristics, allowing light of the display screen to pass therethrough to realize display. These transparent synthetic elastomers are tacky and can bond the two flexible substrate layers 11 together. In addition, the transparent synthetic elastomer has a smaller elastic modulus and a larger elasticity than the material of the flexible base material layer 11. The first glue film 12 that will be made by transparent synthetic elastomer sets up between two flexible substrate layer 11, and when flexible membrane 1 received the impact, first glue film 12 can be through elastic deformation absorption impact energy, can also outwards release elastic potential energy through recovering rapidly to warp, plays good cushioning effect.

Illustratively, as shown in fig. 2, a is a flexible film provided by an embodiment of the present invention, and B is a flexible substrate layer having the same thickness as the flexible film a. When the flexible film a and the flexible substrate layer B are subjected to the same impact, for example, when the flexible film a and the flexible substrate layer B are subjected to the same impact parallel to the X direction, since the first adhesive layer 12 has good elasticity, impact energy can be absorbed, that is, the first adhesive layer 12a can absorb part of the impact energy and the first adhesive layer 12B can also absorb part of the impact energy, and the first adhesive layer 12a and the first adhesive layer 12B can also release elastic potential energy outward by rapidly recovering deformation. Thus, the impact received by the a1 face is smaller than the impact received by the B1 face, and the impact received by the a2 face is smaller than the impact received by the B2 face. It can be seen that the flexible film provided by the embodiment of the invention has good impact resistance.

In some embodiments, the first bondline in the laminate structure of the flexible film may be made using a synthetic elastomer having a relatively high elongation. Illustratively, the transparent synthetic elastomeric material making up the first bondline has an elongation greater than or equal to 300%. Fig. 3 shows a structural diagram of two adjacent flexible substrate layers in the flexible film and a first glue layer between the two flexible substrate layers when the two flexible films of the embodiment of the invention are bent (for example, folded in half). Referring to fig. 3, when the two flexible films are bent, the flexible substrate layers 11a and 11a 'in the flexible films are stretched, and a tensile strain is generated, and the flexible substrate layers 11b and 11 b' are compressed, and a compressive strain is generated. When the transparent synthetic elastomer material of the first adhesive layer in the flexible film has a relatively large elongation, the first adhesive layer between the two flexible substrate layers can be dislocated when the flexible film is bent. For example, the transparent synthetic elastomer material of the first adhesive layer 12a between the flexible substrate layers 11a and 11b in the left figure of fig. 3 has a large elongation rate, so that the first adhesive layer 12a may be dislocated when the flexible film is bent. While the elongation of the material of the first glue layer 12a 'in the flexible film in the right drawing of fig. 3 is smaller, the first glue layer 12 a' does not dislocate when the flexible film is bent under the same bending degree. Comparing the left and right diagrams of fig. 3, it can be seen that when the flexible film is under the same degree of bending, the tensile strain of the flexible substrate layer 11a is smaller than that of the flexible substrate layer 11a 'and the compressive strain of the flexible substrate layer 11b is smaller than that of the flexible substrate layer 11 b' when the first glue layer 12a 'is dislocated in the left diagram, compared to the case where the first glue layer 12 a' is not dislocated in the right diagram. Therefore, when the first adhesive layer is made of the synthetic elastomer with large elongation, the flexible film can achieve a larger bending degree within the elastic strain range of the material of the flexible base material layer, so that the flexible film has a better bending performance.

In some embodiments, the material of the first adhesive layer is a Thermoplastic polyurethane elastomer (TPU). The TPU is a synthetic elastomer and has good elasticity, and when the flexible membrane is impacted, the good elasticity can absorb impact energy and has good buffer effect; TPU also has a relatively high elongation (e.g., greater than or equal to 300%) that can meet the need for flexible film bending; compared with other optical adhesives, the TPU has a large modulus, can better support the flexible substrate layer when impacted, and prevents the flexible substrate layer from deforming to form concave points. For example, fig. 4 shows that in the case of using an optical acrylic adhesive to bond CPI as a flexible substrate layer, the CPI flexible cover plate is not effectively supported and deformed to form pits in a pen-down impact. The TPU is used for replacing an optical acrylic adhesive, and the TPU has relatively large modulus, so that the flexible substrate layer is better supported, and the flexible film has better impact resistance.

In some embodiments, the thickness of the first glue layer is 3 μm to 5 μm. Under this thickness, first glue film can bond two flexible substrate layers together well, and the total thickness of flexible membrane can be controlled to satisfy the user demand of flexible membrane under different scenes.

Further, as previously analyzed, in the laminated structure of the flexible film, the first glue layer can absorb impact energy due to its good elasticity. Then, the greater the number of layers of the first adhesive layer, the greater the ability of the flexible film to absorb impact energy. However, the larger the number of layers of the flexible film, the thicker the flexible film, which affects the bending property of the flexible film. In order to meet different requirements, in some embodiments, the number of the flexible substrate layers in the laminated structure of the flexible film is 2-5. Illustratively, as shown in fig. 1, the number of flexible substrate layers is 3. At this time, the flexible film 1 includes three

flexible substrate layers

11a, 11b, and 11c, each of which is sequentially disposed in the thickness direction (i.e., parallel to the X direction) of the flexible film 1, and one first glue layer 12 is disposed between every two adjacent flexible substrate layers, i.e., the first glue layer 12a is disposed between the flexible substrate layers 11a and 11b, and the first glue layer 12b is disposed between the flexible substrate layers 11b and 11 c. The flexible substrate layers 11a and 11b are bonded by a first adhesive layer 12a, and the flexible substrate layers 11b and 11c are bonded by a first adhesive layer 12 b.

In some embodiments, as shown in fig. 1, the flexible film 1 includes at least two flexible substrate layers 11, and of these flexible substrate layers, two flexible substrate layers located at both ends of the flexible film 1 in the thickness direction (i.e., parallel to the X direction) are a first flexible substrate layer 11a and a second flexible substrate layer 11c, respectively. The flexible film 1 further includes a protective layer 13 on the side of the first flexible substrate layer 11a remote from the second flexible substrate layer 11 c. The protective layer 13 has good light transmission performance, and may include a Hard Coating (Hard Coating, abbreviated as HC) and/or an Anti-fingerprint Film (AF layer) for improving the surface hardness of the flexible substrate layer 11 a; the protective layer 13 may further include an anti-reflection layer to prevent reflection of external light. The function of the protective layer 13 and the material in the protective layer 13 are not limited thereto. For example, the protective layer 13 may function as a stain-proofing layer. Wherein the material of the hard coating layer can be a material with a hardness substantially equal to or higher than 1H (such as 1H, 2H, 3H), wherein the test standard of the hardness is GB T6739-. For example, the hard coat layer may be formed with a thermosetting resin material, an active energy ray-curable resin material, which satisfies the above hardness requirement. The anti-fingerprint layer can be made of a high-molecular polymer with hydrophobicity and oleophobicity, so that the anti-fingerprint layer has good hydrophobicity and oleophobicity, is not easy to adhere to external dust and dirt, and has the characteristic of easily removing foreign matters on the surface under the condition of adhering the dirt and the fingerprint.

With continued reference to fig. 1, in some embodiments, the thickness of the first flexible substrate layer 11a is greatest in each flexible substrate layer 11. In this way, in the laminated structure of the flexible film 1, the flexible base material layer 11a of the uppermost layer is relatively thick, and the protective layer 13 that can improve the hardness of the flexible base material layer 11a is provided thereon, and the hardness and the impact resistance of the flexible film 1 can be further improved.

With continued reference to fig. 1, in some embodiments, the flexible film 1 further includes a second adhesive layer 14 located on a side of the second flexible substrate layer 11c away from the first flexible substrate layer 11a, and the material of the second adhesive layer 14 is an optical adhesive. The optical adhesive has the characteristics of colorless transparency, high light transmittance, high adhesive strength and the like. Illustratively, the optical glue is one or more of silicone, acrylate-type resins (e.g., optical acrylic adhesives), unsaturated polyesters, polyurethanes, and epoxies. In some embodiments, the flexible film 1 further includes a release film disposed on a side of the second glue layer 14 away from the second substrate layer 11c and covering the second glue layer 14. Illustratively, when the flexible film 1 needs to be pasted, the release film may be peeled off the second adhesive layer 14 to expose the second adhesive layer 14, and then the pasting of the flexible film is performed.

The embodiment of the invention also provides a display device. The display device is a product having an image display function, and may be, for example: the display, the television, the billboard, the Digital photo frame, the laser printer with the display function, the telephone, the mobile phone, the Personal Digital Assistant (PDA), the Digital camera, the portable video camera, the viewfinder, the navigator, the vehicle, the large-area wall, the household electrical appliance, the information inquiry equipment (such as the business inquiry equipment and the monitor of the departments of electronic government affairs, bank, hospital, electric power, etc.).

Fig. 5 shows a structural diagram of a display device. As shown in fig. 5, the display device may include a display screen 51 and a cover plate 52.

In some embodiments, the Display screen 51 may be an OLED (Organic Light Emitting Diode) Display screen, a QLED (Quantum Dot Light Emitting Diode) Display screen, an LCD (Liquid Crystal Display) Display screen, a micro LED (including a miniLED or a micro LED, where the LED is a Light Emitting Diode) Display screen, or the like.

In some embodiments, the display screen 51 may include a display panel 53, and the display screen 51 may further include a circular polarizer 54. For example, the display panel 53 is an OLED display panel, a QLED display panel, an LCD display panel, or a micro LED display panel.

In some embodiments, the display screen 51 has a display surface, which is the surface of the display screen from which light is emitted, such that a viewer can see an image displayed by the display screen when facing the display surface. The cover plate 52 is adhered to the display surface of the display screen 51 to cover the display screen 51 and functions to protect the display screen 51. For good display effect, the cover plate 52 may be transparent, so that the cover plate 52 realizes optical characteristics, allowing light of the display screen 51 to penetrate therethrough to realize display.

In some embodiments, cover sheet 52 is a flexible film provided by embodiments of the present invention. Illustratively, as shown in fig. 5, the cover sheet 52 is a flexible film including flexible

base material layers

11a, 11b, and 11c,

first glue layers

12a and 12b, and a protective layer 13. Illustratively, as shown in fig. 1, the flexible film as the cover sheet 52 further includes a second glue layer 14. At this time, the flexible film may be directly adhered as a cover sheet 52 to the display screen 31 through the second adhesive layer 14. For example, when the flexible film further includes a release film disposed on the lower surface of the second adhesive layer 14, the release film may be peeled to expose the second adhesive layer 14, and then the flexible film is bonded to the display screen. Illustratively, the flexible film does not include the second adhesive layer 14. At this time, as shown in fig. 5, the cover plate 52 is bonded to the display screen 51 using an optical glue 55.

Exemplarily, fig. 6 shows a pen-down model of a display device in an embodiment of the present invention. The display device includes a cover plate 52, an adhesive layer 55, and a display screen 51, wherein the display screen 51 may include a display panel, and the display screen 51 may further include a circular polarizer. As shown in fig. 6, by finite element analysis, when there is a heavy impact, the force is diffused layer by layer, and the more layers, the faster the force of the impact disappears, and the less the display screen 51 is damaged. Since the cover plate 52 is a flexible film having a laminated structure, the force of impact disappears faster as the number of layers is large. Also, as previously analyzed, the first

adhesive layers

12a and 12b in the flexible film have good elasticity, and can further absorb the impact energy, so that the impact force transmitted to the display screen 51 is smaller. Therefore, the display device provided by the embodiment of the invention has good impact resistance.

In addition, as previously analyzed, the flexible film has good bending properties due to the small thickness of the flexible substrate layer in the flexible film. And the first glue film can have good elongation, and the bending performance of the flexible film is further improved. The display device in the embodiment of the invention uses the flexible film as the cover plate, so that the display device has good bending performance.

The embodiment of the invention also provides a display device. The display device is a product having an image display function, and may be, for example: a display, a television, a billboard, a Digital photo frame, a laser printer with a display function, a telephone, a mobile phone, a Personal Digital Assistant (PDA), a Digital camera, a camcorder, a viewfinder, a navigator, a vehicle, a large-area wall, a home appliance, an information inquiry apparatus (e.g., a business inquiry apparatus, a monitor, etc. in the departments of e-government, banking, hospital, electric power, etc., fig. 7 shows a structural diagram of a display device, and as shown in fig. 7, the display device may include a display screen 51, a cover plate 71, and a cover plate film 72.

In some embodiments, the display screen 51 may be the previously listed display screens.

In some embodiments, the display screen 51 may include a display panel 53, and the display screen 51 may further include a circular polarizer 54.

In some embodiments, the display screen 51 has a display surface, which is the surface of the display screen from which light is emitted, such that a viewer can see an image displayed by the display screen when facing the display surface. The cover 71 is adhered to the display surface of the display screen 51 to cover the display screen 51 and to protect the display screen 51. Illustratively, the cover plate 71 is bonded to the display screen 51 using an optical glue 55. For good display effect, the cover plate 71 may be transparent, so that the cover plate 71 realizes optical characteristics, allowing light of the display screen 51 to transmit to realize display. Illustratively, the material of the cover plate 71 may include one or more of Polyethylene (PE), Polypropylene (PP), Polystyrene (PS), Polyethylene Terephthalate (PET), Polyethylene Naphthalate (PEN), Polyimide (PI), and glass. For example, the material of the cover plate may be PET, transparent Polyimide (CPI), or Ultra-Thin Glass (UTG).

In some embodiments, the cover film 72 is a flexible film provided by embodiments of the present invention. Illustratively, as shown in fig. 7, the cover film 72 is a flexible film including flexible

base material layers

11a, 11b, and 11c,

first glue layers

12a and 12b, and including the protective layer 13. Also, a cover film 72 is bonded to the surface of the cover 71 on the side away from the display screen 51 to cover the cover 71 and protect it. Illustratively, as shown in fig. 1, the flexible film as the cover film 72 further includes the second glue layer 14. At this time, the flexible film may be directly adhered as a cover film 72 to the cover 71 through the second glue layer 14. For example, when the flexible film further includes a release film disposed on the lower surface of the second adhesive layer 14, the release film may be peeled to expose the second adhesive layer 14, and then the flexible film may be adhered to the cover plate. Illustratively, the flexible film as the cover film 72 does not include the second glue layer 14. At this time, as shown in fig. 7, a cover film 72 may be bonded to the cover 71 using an optical glue 73.

As previously analyzed, embodiments of the present invention provide flexible films having good bending and impact properties. When the display device in the embodiment of the invention uses the flexible film as the cover plate film, the bending performance of the display device can meet the requirement, and meanwhile, the display device also has good impact resistance.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A flexible film, comprising:

the at least two flexible substrate layers are sequentially arranged along the thickness direction of the flexible film;

at least one first glue layer; a first adhesive layer is arranged between every two adjacent flexible substrate layers and is bonded through the first adhesive layers;

wherein, the material of the first glue layer is transparent synthetic elastomer.

2. The flexible film of claim 1,

the thickness of at least one flexible substrate layer is 5-10 μm.

3. The flexible film of claim 1,

the thickness of the first adhesive layer is 3-5 μm.

4. The flexible film of claim 1,

the number of the flexible substrate layers is 2-5.

5. The flexible film of claim 1,

the first adhesive layer is made of thermoplastic polyurethane elastomer.

6. A flexible film according to any one of claims 1 to 5,

in the at least two flexible substrate layers, two flexible substrate layers positioned at two ends of the flexible film in the thickness direction are respectively a first flexible substrate layer and a second flexible substrate layer;

the flexible film further comprises:

and the protective layer is positioned on one side of the first flexible base material layer, which is far away from the second flexible base material layer.

7. The flexible film of claim 6,

and the thickness of the first flexible substrate layer is the largest in the at least two flexible substrate layers.

8. The flexible film of claim 6,

the flexible film further comprises:

the second adhesive layer is positioned on one side, far away from the first flexible base material layer, of the second flexible base material layer; the second adhesive layer is made of optical adhesive.

9. A display device, comprising:

a display screen;

a cover plate bonded to the display surface of the display screen, the cover plate being the flexible film according to any one of claims 1 to 8.

10. A display device, comprising:

a display screen;

the cover plate is bonded on the display surface of the display screen;

a cover film adhered to a surface of the cover remote from the display screen, the cover film being the flexible film of any one of claims 1 to 8.