CN214175570U

CN214175570U - Flexible display screen and display device

Info

Publication number: CN214175570U
Application number: CN202022866511.5U
Authority: CN
Inventors: 李玉良; 范柳彬; 肖志勇; 李金库; 刘明星; 沈亚南
Original assignee: Kunshan Govisionox Optoelectronics Co Ltd
Current assignee: Kunshan Govisionox Optoelectronics Co Ltd
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2021-09-10
Anticipated expiration: 2030-12-03

Abstract

The application provides a flexible display screen and a display device, wherein the flexible display screen is provided with a display area and a non-display area extending outwards from the display area, and the non-display area comprises a bending area; the flexible display screen includes: the polaroid is arranged in the display area; the protective layer is at least arranged in the bending area; the polaroid and the protective layer are arranged on the same layer, and a connecting structure is arranged at the connecting position of the protective layer and the polaroid. Through increasing connection structure between protective layer and polaroid for zonulae occludens between protective layer and the polaroid, and then has avoided taking place to drop between protective layer and the district screen body of buckling and the district screen body circuit of buckling of leading to walks the line damage, has reduced the break between polaroid and the protective layer, has reduced and is close to the risk that the district screen body membrane material of buckling takes place the fracture when the reliability test.

Description

Flexible display screen and display device

Technical Field

The application relates to the field of flexible display, in particular to a flexible display screen and a display device.

Background

With the development of flexible display technology, flexible display screens have become the development trend of future display terminals. In order to achieve the full screen display effect of the flexible display screen, the flexible display screen is usually implemented by bending the non-display area, that is: the non-display area of the flexible display screen is bent to the back of the flexible display screen, so that the width of a frame of the screen body is reduced, and the screen occupation ratio is improved.

However, because the lower frame is continuously narrowed, the bending radius of the non-display area of the flexible screen is continuously reduced, so that the situation that the film layer is easily separated from the protective layer of the bending area is caused, and further the problems of failure of the screen body of the bending area and the like are caused.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a flexible display panel and a display device for solving the problems that the bending region screen body fails due to easy film separation in the bending region and the film cracks occur due to the fact that the ball falls off due to the fault difference between the protective layer and the polarizer in the bending region.

A first aspect of the present application provides a flexible display screen, which has a display area and a non-display area extending outward from the display area, wherein the non-display area includes a bending area; the flexible display screen includes: the polaroid is arranged in the display area; the protective layer is at least arranged in the bending area; the polaroid and the protective layer are arranged on the same layer, and the connecting structure is arranged at the connecting position of the protective layer and the polaroid.

The flexible display screen comprises a screen body and a protective layer. The flexible screen body comprises a display area and a non-display area extending outwards from the display area, and the non-display area comprises a bending area. The protective layer is attached to the outer side surface of the flexible screen body in the bending area and used for protecting the wiring of the circuit in the bending area, when the non-display area is bent to the back of the flexible screen body, the radius of the bending area is smaller and smaller, the protective layer is prone to peeling off, falling off and the like, so that the protective layer loses the protective effect on the metal wiring in the bending area, and the damage failure of the screen body in the bending area or the circuit wiring is caused. In addition, the problem that the film layer close to the bending area is easy to break in reliability test due to the fact that the fault difference exists between the bending area protective layer and the polaroid attached to the flexible screen body.

The protective layer is tightly connected with the polaroid by adding the connecting structure between the protective layer and the polaroid, so that the damage of circuit wiring of the screen body of the bending area caused by the falling off between the protective layer and the flexible screen body of the bending area is avoided; the offset between the polaroid and the protective layer is further reduced, and the risk that the flexible screen body film layer close to the bending area is broken during reliability test is reduced.

In one embodiment, the connection structure includes an adhesive disposed at a connection between the polarizer and the protection layer.

In one embodiment, the adhesive covers the joint of the polarizer and the protective layer; and/or the adhesive is embedded into the joint of the polarizer and the protective layer.

In one embodiment, the polarizer further comprises a groove arranged on one surface of the polarizer, which is close to the adhesive, and a protrusion which is arranged on one surface of the adhesive, which is close to the polarizer, and is mutually embedded with the groove; and/or the connecting structure further comprises a groove arranged on one surface, close to the adhesive glue, of the protective layer and a protrusion arranged on one surface, close to the protective layer, of the adhesive glue and embedded with the groove.

In one embodiment, the material of the adhesive glue includes a glue material such as two-component epoxy resin or spray glue.

In one embodiment, the connection structure includes a rough structure disposed at a connection portion of the polarizer and the protection layer, and the rough structure is obtained by roughening a side surface of the connection portion of the polarizer and the protection layer.

In one embodiment, the rough structure comprises a groove arranged on one side of the polarizer close to the protective layer and a protrusion which is arranged on one side of the protective layer close to the polarizer and is mutually embedded with the groove; or the rough structure comprises a bulge arranged on one surface of the polaroid close to the protective layer and a groove which is arranged on one surface of the protective layer close to the polaroid and is mutually embedded with the bulge.

In one embodiment, the number of grooves is at least one.

In one embodiment, the groove is at least one of square, trapezoidal, triangular, and semi-circular in shape.

A second aspect of the present application provides a display device comprising the flexible display screen of any of the above embodiments.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic structural diagram of a flexible display screen in the prior art of the present application;

FIG. 2 is a schematic cross-sectional view of a flexible display screen in an alternative embodiment of the present application;

FIG. 3 is a schematic cross-sectional view of a flexible display screen in an alternative embodiment of the present application;

FIG. 4 is an enlarged schematic view of a connection structure of a flexible display screen according to an alternative embodiment of the present application;

FIG. 5 is a schematic illustration of a cross-section of a flexible display screen in an alternative embodiment of the present application;

FIG. 6 is an enlarged schematic view of a connection structure of a flexible display screen according to an alternative embodiment of the present application;

fig. 7 is an enlarged schematic view of a connection structure of a flexible display screen according to an alternative embodiment of the present application.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

According to the description of the background art, in order to improve the screen occupation ratio of the flexible display screen, the flexible display screen is usually realized by bending the non-display area to the back side (namely, the non-display side) of the flexible screen body, and as the lower frame is continuously narrowed and the bending radius of the non-display area of the flexible display screen is continuously reduced, the situation that a film layer is easily separated between the flexible screen body and a protective layer of the bending area is caused, and the problem that the screen body of the bending area is failed is caused; in addition, the problem that the film layer close to the bending area is easy to break in reliability test due to the fact that the fault difference exists between the bending area protective layer and the polaroid attached to the flexible screen body.

Specifically, reference may be made to fig. 1, where fig. 1 is a schematic structural diagram of a flexible display screen in the prior art of the present application. The flexible display screen comprises a flexible screen body 100, wherein the flexible screen body 100 comprises a flexible substrate, and a display device layer and a driving element which are arranged on the flexible substrate. Optionally, the material of the flexible substrate may be polyimide, polycarbonate, polyethylene terephthalate, or silicone, which has good flexibility. The flexible screen body 100 may be divided into a display area 110 and a non-display area 120 extending from the display area 110. A display device layer is disposed on the flexible substrate of the display region 110, and the display device layer may include a plurality of sub-pixels for displaying an image and pixel circuits for driving the sub-pixels to emit light, so that the display region 110 of the flexible screen body 100 displays a picture.

The display device layer includes a film structure such as a thin film transistor, a gate line, a data line, a capacitor, an anode, an organic light emitting layer, and a cathode. The driving element is disposed on the non-display area 120 of the flexible screen body 100, and is used for providing a signal to enable the flexible display screen to realize functions such as image display. The driving element may include a driving chip, a flexible circuit board and the like. When the flexible screen body 100 is bent, only the flexible substrate of the non-display area 120, the metal routing layer and the organic cover layer disposed on the flexible substrate are bent, and the functional layers disposed on the flexible substrate of the display area do not need to be bent.

Optionally, a polarizer 200 may be further disposed on the display region 110 of the flexible screen body 100 to increase the light transmission of the flexible screen body 100 and reduce the reflection of the external light. The polarizer 200 may be attached to the display area 110 of the flexible screen 100 by a layer of photosensitive resist. The polarizer 200 may further have a touch sensitive layer 300 disposed thereon, and the touch sensitive layer 300 is integrated with a touch sensor to sense a touch operation of a user. A flexible cover 400 is also disposed over the touch sensitive layer 300 for protecting the flexible screen body 100. The touch sensitive layer 300 and the flexible cover 400 may also be connected by a photoresist layer. Further, the peripheral edge of the side of the flexible cover 400 close to the touch sensitive layer 300 is further coated with an ink layer for shading to improve the display effect of the flexible display screen.

Optionally, the back side of the display area 110 of the flexible screen body 100 may be provided with a support structure 500, wherein the support structure 500 comprises a first support film near the display side of the flexible screen body 100 and a second support film far from the display side of the flexible screen body 100. The first support film and the second support film have higher rigidity than the flexible screen 100, and thus rigidly support the flexible screen 100. In order to limit the bending radius of the bending region, the supporting structure 300 further includes a padding block disposed between the first supporting film and the second supporting film, and the padding block may be bonded to the first supporting film through a composite adhesive layer.

Further, the non-display area 120 of the flexible screen body 100 comprises a bending area, wherein the bending area has an outer side surface and an inner side surface opposite to each other, where the outer side surface refers to a surface on the same side as the display surface of the flexible screen body 100. The protection layer 600 is disposed on the flexible screen body 100 on the outer surface of the bending region and is used for protecting the circuit traces inside the bending region, when the non-display region 120 is bent to the back of the screen body, because the radius of the bending region is smaller and smaller, the protection layer 600 is prone to peeling off, falling off and the like at the non-display region adjacent to the display region 110, so that the protection layer 600 loses the protection effect on the metal traces inside the bending region, and the flexible screen body 100 or the circuit traces in the bending region are damaged and failed. In addition, due to reasons such as a manufacturing process, a gap exists at a joint between the protective layer 600 and the polarizer 200, and a bonding force between the protective layer and the polarizer 200 is weak, so that when a reliability test is performed on the flexible display screen, such as a cold and hot shock test, expansion and contraction behaviors of different film materials are inconsistent, such as the polarizer 200 contracts after being subjected to the cold and hot shock, the flexible screen body 100 is pulled, so that the local stress of the flexible screen body 100 is increased, and risks such as wire breakage and film crack occur. And when the ball is dropped, the tested flexible display screen is placed on a testing machine table, the steel ball with the specified weight freely drops on the flexible display screen from the specified drop height, the product is impacted, and then the appearance and various performances of the product are checked. However, the film layer of the lower frame area is complex, so that the problem that the corresponding position of the flexible screen body is deformed easily in the lower frame area in a drop test is solved.

In order to solve the above technical problem, a first aspect of the present application provides a flexible display screen.

Referring to fig. 2, fig. 2 is a schematic cross-sectional view of a flexible display screen in an alternative embodiment of the present application. The flexible display screen has a display area 110 and a non-display area 120, wherein the non-display area 120 is formed by extending outward from the display area 110, and the non-display area 120 includes a bending area. Specifically, the display area 110 is a flexible display screen display image area provided with the above-described display device layer and driving elements and the like for displaying images. The non-display area 120 is disposed around the display area 110, and is used for disposing components such as a driver chip (IC) and a Flexible Printed Circuit (FPC), and can be connected to an external driver to implement functions such as signal transmission and driving light-emitting devices in the display device layer to emit light.

The display area 110 includes a display surface for displaying an image and a non-display surface, i.e., a rear surface, disposed opposite to the display surface. In order to meet the requirement of a narrow frame of the flexible display screen, the non-display area 120 where no image is displayed may be bent 180 degrees toward the lower side of the flexible screen body 100, and the non-display area 120 is bent to the back of the display area 110, so as to hide the non-display area 120, thereby increasing the area ratio of the display area 110 on the flexible display screen.

The bending region of the non-display region has an outer surface on the same side as the display surface of the flexible screen body 100 after bending, and an inner surface opposite to the outer surface. In order to protect the circuit inside the bending region 121 from being damaged during the bending process, a protection layer 600 is disposed at the outer surface of the bending region, and the protection layer 600 is disposed on the flexible screen 100 at the outer surface of the bending region. Optionally, the material of the protection layer 600 may be a rubber material with good bending resistance, such as acrylic rubber, resin rubber, etc. The protection layer 600 is used to protect the bent region after bending and buffer the stress generated during the bending process.

The flexible display screen further comprises a polarizer 200 arranged in the display area 110; a protection layer 600 at least disposed in the bending region 120; the polarizer and the protection layer are disposed on the same layer, and a connection structure is disposed at a connection position between the protection layer 600 and the polarizer 200. Specifically, referring to fig. 2, the polarizer 200 and the protection layer 600 are located on the same side of the flexible panel 100, and the protection layer 600 and the polarizer 200 are located on the same layer during the preparation of the adhesive, and a connection is formed between the protection layer 600 and the polarizer 200. Because the protective layer 600 is prepared by processes such as gluing before the flexible screen body is bent, and the glue material for forming the protective layer 600 has certain fluidity during the gluing preparation process, a gap is formed at the joint between the protective layer 600 and the polarizer 200 during the curing process, so that the bonding force between the protective layer 600 and the polarizer 200 is reduced, and further, reliability test is performed on the flexible display screen, such as cold and hot impact test or ball drop test, so that the membrane structure of the flexible display screen is separated, and the metal wiring is broken, and other defects occur, therefore, the inventor arranges a connection structure at the joint between the protective layer 600 and the polarizer 200. The adhesive force between the protective layer 600 and the polarizer 200 is increased to solve the problem of poor reliability of the flexible display panel.

In an alternative embodiment, with continued reference to FIG. 2, the attachment structure includes an adhesive 700 disposed at the junction of the polarizer 200 and the protective layer 600. The adhesion of the adhesive 700 increases the bonding force between the polarizer 200 and the protective layer, and the protective layer 600 can be pulled when the polarizer 200 is subjected to cold and hot impact shrinkage, so that the flexible screen body 100 on the lower side of the protective layer 600 is also stretched, stress is not concentrated on the junction of the polarizer 200 and the flexible screen body 100 any more, and the risk that the junction is damaged is reduced. In addition, because the adhesive force between the polarizer 200 and the protective layer 600 is increased, the deformation resistance of the flexible screen body 100 is increased, so that the deformation of the corresponding position of the flexible screen body 100 is also reduced when the falling ball impacts, and the risk that the falling ball damages the flexible display screen is reduced.

Optionally, the adhesive 700 coats the joint between the polarizer 200 and the protective layer 600; and/or, the adhesive 700 is embedded into the joint between the polarizer 200 and the protective layer 600, and the polarizer 200 and the protective layer 600 are tightly connected together through the adhesion of the adhesive 700. Specifically, the adhesive 700 may coat the connection between the polarizer 200 and the protection layer 600; or the adhesive 700 is embedded in the joint between the polarizer 200 and the protective layer 600, i.e., in the gap between the two. In addition, as shown in fig. 2, the adhesive 700 is embedded into the polarizer 200 and the protective layer 600 and covers the joint between the polarizer 200 and the protective layer 600, so as to further increase the bonding force between the polarizer 200 and the protective layer 600. The adhesive 700 is disposed between the polarizer 200 and the protection layer 600, so that the bounce force caused by bending the non-display area of the flexible screen body 100 can be offset, the layering phenomenon on the contact surface between the protection layer 600 and the flexible screen body 100 can be prevented, and the protection layer 600 in the bending area can be prevented from falling off. In addition, the adhesive 700 is added between the polarizer 200 and the protective layer 600 outside the bending region of the non-display region, so that the rigidity break difference between the polarizer 200 and the non-display region 120 is reduced, and the damage of the film layer close to the non-display region 120 due to impact stress during reliability tests such as integral falling, ball falling, cold and hot impact and the like of the flexible display screen is avoided.

Optionally, the material of the adhesive 700 may be epoxy resin or glue material such as spray glue.

In an alternative embodiment, as shown in fig. 3 and 4, fig. 3 is a schematic cross-sectional view of a flexible display screen in an alternative embodiment of the present application; fig. 4 is an enlarged schematic view of a connection structure of a flexible display screen in an alternative embodiment of the present application. The flexible display screen further comprises a groove 710 arranged on one side of the polarizer 200 close to the adhesive 700, and a protrusion arranged on one side of the adhesive 700 close to the polarizer 200 and mutually embedded with the groove 710; and/or the connecting structure comprises a groove 711 arranged on one surface of the protective layer 600 close to the adhesive glue 700, and a protrusion arranged on one surface of the adhesive glue 700 close to the protective layer 600 and mutually embedded with the groove 711. The contact areas between the adhesive 70 and the polarizer 200 and between the adhesive 700 and the protective layer 600 are increased by the matching of the groove and the protrusion, the adhesion between the adhesive 700 and the polarizer 200 and between the adhesive 700 and the protective layer 600 are increased, and the adhesion between the protective layer 600 and the polarizer 200 is further increased.

Specifically, referring to fig. 4, a groove 710 is disposed on a surface of the polarizer 200 near the adhesive 600, wherein the groove 710 is disposed in the polarizer 200, so as to increase adhesion between the adhesive 700 and the polarizer 200; the protrusions which are arranged on one side of the adhesive 700 close to the polarizer 200 and are mutually embedded with the grooves 710 are mutually matched with the grooves and the protrusions, so that the contact area and the film adhesion between the adhesive 700 and the polarizer 200 are increased, and the delamination of the adhesive 700 and the polarizer 200 due to bending stress is prevented.

As shown in fig. 4, a groove 711 is formed in a surface of the protective layer 600 near the adhesive 700, wherein the groove 711 is located in the protective layer, so that adhesion between the protective layer 600 and the adhesive 700 can be increased; the protrusions which are arranged on one side of the adhesive 700 close to the protection layer 600 and are mutually embedded with the grooves 711 are mutually matched with the protrusions through the grooves, so that the contact area between the protection layer 600 and the adhesive layer 700 and the film adhesion force are increased, and the delamination of the protection layer 600 and the adhesive layer 700 due to bending stress is prevented.

In an optional embodiment, the grooves and the protrusions are arranged oppositely and attached without gaps, so that the contact area and the adhesive force of the grooves and the protrusions can be increased, the adhesive force between the polarizer 200 and the protective layer 600 is further increased, and the film separation phenomenon between the protective layer 600 and the flexible screen body 100 due to bending stress during bending is prevented.

Optionally, the number of the grooves is at least one, and specifically, a plurality of grooves may be provided to increase the adhesion.

Optionally, the shape of the groove includes, but is not limited to, at least one of square, trapezoid, triangle, and semicircle.

In an alternative embodiment, the connection structure includes a rough structure disposed at the connection portion of the polarizer 200 and the protection layer 600, and the rough structure is obtained by roughening the side surface of the connection portion of the polarizer and the protection layer. Specifically, the side surface of the polarizer connected with the protective layer is roughened through etching and other processes, so that the bonding force between the polarizer and the protective layer is increased.

In an alternative embodiment, shown in fig. 5 and 6, fig. 5 is a schematic view of a cross-section of a flexible display screen in an alternative embodiment of the present application; fig. 6 is an enlarged schematic view of a connection structure of a flexible display screen according to an alternative embodiment of the present application. The rough structure comprises a groove arranged on one surface of the polarizer 200 close to the protective layer 600 and a protrusion which is arranged on one surface of the protective layer 600 close to the polarizer 200 and is mutually embedded with the groove; or, the rough structure 610 includes a protrusion disposed on a side of the polarizer 200 close to the protection layer 600, and a groove disposed on a side of the protection layer 600 close to the polarizer 200 and engaged with the protrusion.

Specifically, the rough structure includes a groove 6101 disposed on a surface of the polarizer 200 near the protection layer 600, and a protrusion 6102 disposed on a side of the protection layer 600 near the polarizer 200 and engaged with the groove 6101. The groove 6101 is located in the polarizer 200, which can increase the adhesion between the passivation layer 600 and the polarizer 200, and the groove 6101 and the protrusion 6102 are matched with each other, thereby increasing the contact area between the passivation layer 600 and the polarizer 200 and the film adhesion, and preventing the two from delaminating due to bending stress. Alternatively, the rough structure 610 includes a groove disposed on a surface of the protection layer 600 near the polarizer 200, and a protrusion disposed on a surface of the polarizer 200 near the protection layer 600 and engaged with the groove.

In one embodiment, the number of grooves is at least one.

In one embodiment, the groove has a shape of at least one of a square, a trapezoid, a triangle, and a semicircle. Alternatively, the shape of the groove 6101 includes, but is not limited to, at least one of a square, a trapezoid, a triangle, and a semicircle. Alternatively, as shown in fig. 6, the groove 6101 may also be wedge-shaped or triangular in shape. Optionally, as shown in fig. 7, fig. 7 is an enlarged schematic view of a connection structure of a flexible display screen in an alternative embodiment of the present application. The shape of the groove 6101 may also be a trapezoid, which can further increase the bonding force between the protection layer 200 and the polarizer 600.

A second aspect of the present application provides a display device comprising a flexible display screen of any of the preceding embodiments. Furthermore, the display device can also comprise a frame for supporting the flexible display screen and a protective cover plate for protecting the flexible display screen, and the frame is sleeved on the periphery of the flexible display screen. Further, the frame may be flexible, but the frame may be more rigid than the flexible display screen. The protective cover plate is attached to the display surface of the flexible display screen. Further, the display device may be a mobile phone, a tablet computer, or the like.

The display device is provided with the flexible display screen of any one of the embodiments. The flexible display screen is through to flexibility, the junction between protective layer 600 and the polaroid 200 sets up connection structure, make the adhesion between polaroid 200 and the protective layer 600 increase, thereby avoided the flexible display screen to buckle the back because the effect of resilience force leads to taking place to peel off the phenomenon that drops between flexible screen body 100 and the protective layer 200, the flexible screen body of the district of buckling and the damage that the circuit walked the line have been avoided, in addition, connection structure's increase has reduced the disconnected poor between polaroid and the protective layer, be close to the cracked risk of the district of buckling screen body membrane material emergence when having reduced reliability testing, and then display device's life has been improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A flexible display screen is characterized by comprising a display area and a non-display area extending outwards from the display area, wherein the non-display area comprises a bending area; the flexible display screen includes:

the polaroid is arranged in the display area;

the protective layer is at least arranged in the bending area;

the polaroid and the protective layer are arranged on the same layer, and a connecting structure is arranged at the connecting position of the protective layer and the polaroid.

2. The flexible display of claim 1, wherein the connection structure comprises an adhesive disposed at a connection between the polarizer and the protective layer.

3. The flexible display screen of claim 2, wherein the adhesive covers the joint of the polarizer and the protective layer; and/or the presence of a gas in the gas,

and the bonding glue fills the joint of the polarizer and the protective layer.

4. The flexible display screen of claim 2, further comprising a groove disposed on a surface of the polarizer adjacent to the adhesive, and a protrusion disposed on a surface of the adhesive adjacent to the polarizer and engaged with the groove;

and/or, connection structure still including set up in the protective layer is close to the recess of the one side of bonding glue, and set up in bonding glue is close to the one side of protective layer, and with the arch of the mutual gomphosis of recess.

5. The flexible display of claim 2, wherein the adhesive glue comprises a two-part epoxy or a spray glue.

6. The flexible display screen of claim 1, wherein the connection structure comprises a rough structure disposed at a connection position of the polarizer and the protection layer, and the rough structure is made by roughening a side surface of the connection position of the polarizer and the protection layer.

7. The flexible display screen of claim 6, wherein the rough structure comprises a groove arranged on one side of the polarizer close to the protective layer, and a protrusion arranged on one side of the protective layer close to the polarizer and mutually embedded with the groove; or, the rough structure comprises a protrusion arranged on one surface of the polarizer, which is close to the protective layer, and a groove arranged on one surface of the protective layer, which is close to the polarizer, and the groove is mutually embedded with the protrusion.

8. A flexible display according to claim 4 or 7, wherein the number of recesses is at least one.

9. A flexible display according to claim 4 or 7 wherein the recess is at least one of square, trapezoidal, triangular and semi-circular in shape.

10. A display device, characterized in that it comprises a flexible display screen according to any one of claims 1-9.