CN113140161A - Flexible display panel, display device and terminal equipment - Google Patents

Abstract

The application relates to the technical field of display, in particular to a flexible display panel, a display device and terminal equipment. The flexible display panel comprises a substrate base plate, a bending area, a first non-bending area and a second non-bending area, wherein the bending area, the first non-bending area and the second non-bending area are positioned on the substrate base plate and are positioned on two sides of the bending area; the bending area is provided with a first connecting part connected with the first non-bending area, the bending area is provided with a second connecting part connected with the second non-bending area, two first chamfers are arranged on two opposite sides of the first connecting part separated from the first non-bending area, and two second chamfers are arranged on two opposite sides of the second connecting part separated from the second non-bending area; the flexible display panel further comprises a reinforcing layer, the reinforcing layer is attached to the flexible display panel, and the orthographic projection of the reinforcing layer on the substrate base plate covers the orthographic projection of the first chamfer and the orthographic projection of the second chamfer on the substrate base plate. The reinforcing layer covers the first chamfer and the second chamfer, and the problem of stress concentration is improved.

Description

Flexible display panel, display device and terminal equipment

Technical Field

The application generally relates to the technical field of display, and particularly relates to a flexible display panel, a display device and a terminal device.

Background

At present, the market share of the flexible screen is gradually expanded, the miniaturization of the flexible screen puts higher requirements on the bending performance of the flexible display panel, and particularly, 180-degree bending of a product under a narrower bending width is required.

Based on the above, a display device as shown in fig. 1 is provided, in which the widths of the flexible display panel and the flexible circuit board 17 region are large, the width of the middle bending region 13 is small, and the width of the bending region 13 cannot be increased in order to prevent the bending region 13 from interfering with the lower frame of the flexible screen, so that there is a phenomenon of stress concentration in four chamfers formed between the bending region 13 and the non-bending regions on both sides, and thus the probability of cracks occurring in the bending region 13 is large.

As shown in fig. 2, in the related art, a mode of disposing a reinforcing adhesive at the bending region 13 is mostly adopted to adjust the stress distribution in the thickness direction of the bending region 13, so as to avoid cracks in the bending region 13. As shown in fig. 3-4, taking one of the chamfers with the most obvious stress concentration as an example, the stress is concentrated on the chamfers before the flexible display panel is bent, and the stress is concentrated on the positions where the reinforcing layer 2 is finished after the flexible display panel is bent, and it can be seen that, by the above manner, only the stress distribution in the thickness direction of the bending region 13 can be adjusted, and the problem of the stress concentration on the chamfers cannot be solved.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

In order to solve the technical problem that stress is concentrated at a chamfer in the prior art, the application provides a flexible display panel, a display device and a display device which relieve stress concentration at the chamfer.

In order to achieve the purpose of the invention, the following technical scheme is adopted in the application:

according to a first aspect of an embodiment of the present application, a flexible display panel is provided, including a substrate base plate, and a bending region, a first non-bending region and a second non-bending region on the substrate base plate, where the first non-bending region and the second non-bending region are located at two sides of the bending region, and the first non-bending region is a display region;

the bending area is provided with a first connecting part connected with the first non-bending area, the bending area is provided with a second connecting part connected with the second non-bending area, two first chamfers are arranged on two opposite sides of the first connecting part separated from the first non-bending area, and two second chamfers are arranged on two opposite sides of the second connecting part separated from the second non-bending area;

the flexible display panel further comprises a reinforcing layer, the reinforcing layer is attached to the flexible display panel, and the reinforcing layer is arranged on the orthographic projection of the substrate base plate to cover the first chamfer and the second chamfer.

In an alternative of this embodiment, the first chamfer and the second chamfer are both rounded corners.

In an alternative of this embodiment, the radius of curvature of the rounded corners is between 0.5mm and 2 mm.

In an alternative of this embodiment, an orthogonal projection of the stiffening layer on the substrate base plate and an orthogonal projection of the first non-bending region on the substrate base plate have an overlapping portion, and/or an orthogonal projection of the stiffening layer on the substrate base plate and an orthogonal projection of the second non-bending region on the substrate base plate have an overlapping portion.

In an alternative of this embodiment, the flexible display panel further includes a back film, and the back film and the stiffening layer are respectively located at two opposite sides of the flexible display panel; the back membrane is provided with a thinning area in the bending area, and the thickness of the thinning area in the direction vertical to the substrate base plate is smaller than that of other areas of the back membrane in the direction vertical to the substrate base plate.

In the alternative of this embodiment, the stiffening layer includes positive stiffening layer and back stiffening layer, positive stiffening layer is located first connecting portion with the bending zone deviates from one side of notacoria, back stiffening layer is located the notacoria deviates from one side of positive stiffening layer, positive stiffening layer at the orthographic projection of substrate with back stiffening layer does not have the overlap portion at the orthographic projection of substrate.

In an alternative of this embodiment, an orthographic projection of the front reinforcing layer on the substrate base plate covers an orthographic projection of the first chamfer on the substrate base plate, and an orthographic projection of the rear reinforcing layer on the substrate base plate covers an orthographic projection of the second chamfer on the substrate base plate.

In an alternative of this embodiment, the stiffening layer has a trapezoidal shape in a plane perpendicular to the base substrate.

In an alternative of this embodiment, the stiffening layer is an acrylic layer.

According to a second aspect of the embodiments of the present application, there is provided a display device, including a flexible printed circuit board and the flexible display panel according to any one of the embodiments of the first aspect:

the flexible circuit board is connected to the lower side of the second non-bending area.

According to a third aspect of embodiments of the present application, there is provided a terminal device including the display apparatus of the second aspect.

In an alternative of this embodiment, the terminal device includes a mobile phone, a wearable device, a vehicle-mounted screen, or a television.

The application discloses flexible display panel, display device and display device's advantage and positive effect lie in:

the flexible display panel of the embodiment of the application, relative both sides of first connecting portion and first non-bending region separation have two first chamfers, relative both sides of second connecting portion and second non-bending region separation have two second chamfers, to the easy condition that stress concentration appears in first chamfer and second chamfer, the strengthening layer in this embodiment has covered first chamfer and second chamfer and the region between first chamfer and the second chamfer, can improve the stress concentration's in first chamfer and second chamfer problem, reduce the probability of producing the crackle in the bending region. According to experimental data, compared with the prior art, in the unbent state of the flexible display panel, the stress of the first chamfer or the second chamfer can be reduced by about 10%, and in the bent state, the stress of the first chamfer or the second chamfer can be reduced by about 50%.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

Fig. 1 is a schematic structural view of a related art display device before bending;

fig. 2 is a schematic structural view of a flexible display panel of the related art before bending;

FIG. 3 is a stress distribution diagram of a flexible display panel of the related art before bending;

fig. 4 is a stress distribution diagram of a flexible display panel of the related art after bending;

fig. 5 is a schematic structural diagram of a flexible display panel provided in this embodiment of the present application after being bent;

fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present disclosure before bending;

fig. 7 is a schematic structural diagram of a flexible display panel provided in this embodiment of the present application before bending;

fig. 8 is a stress distribution diagram of a flexible display panel according to an embodiment of the present disclosure before bending;

fig. 9 is a stress distribution diagram of a flexible display panel provided in an embodiment of the present application after bending;

fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present disclosure before bending;

fig. 11 is a schematic structural diagram of a flexible display panel provided in this embodiment of the present application before bending.

Wherein the reference numerals are as follows:

11. a first non-bending region; 12. a second non-bending region; 13. a bending zone; 131. a first chamfer; 132. a second chamfer; 14. a back film; 141. a first back film; 142. a second back film; 143. a thinning region; 16. a support layer; 17. a flexible circuit board; 2. a reinforcing layer; 21. a front-side reinforcing layer; 22. and a back reinforcing layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all 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 application.

Based on the consideration of the technical problem that stress concentration easily occurs at each chamfer of the flexible display panel, which leads to cracking easily occurring in the bending region 13, referring to fig. 5-11, the embodiment of the present application provides a flexible display panel, which includes a substrate, and a bending region 13, a first non-bending region 11 and a second non-bending region 12 located on the substrate, where the first non-bending region 11 and the second non-bending region 12 are located on two sides of the bending region 13, and the first non-bending region 11 is a display region;

the bending region 13 has a first connecting portion connected to the first non-bending region 11, the bending region 13 has a second connecting portion connected to the second non-bending region 12, two first chamfers 131 are provided on two opposite sides of the first connecting portion separated from the first non-bending region 11, and two second chamfers 132 are provided on two opposite sides of the second connecting portion separated from the second non-bending region 12;

the flexible display panel further comprises a reinforcing layer 2, wherein the reinforcing layer 2 is attached to the flexible display panel, and the reinforcing layer 2 is arranged on the orthographic projection of the substrate base plate to cover the first chamfer 131 and the second chamfer 132.

The flexible display panel of the embodiment of the application has two first chamfers 131 on the opposite two sides of the first connecting portion separated from the first non-bending region 11, has two second chamfers 132 on the opposite two sides of the second connecting portion separated from the second non-bending region 12, and for the situation that stress concentration easily occurs at the first chamfers 131 and the second chamfers 132, the reinforcing layer 2 in the embodiment covers the first chamfers 131 and the second chamfers 132 and the area between the first chamfers 131 and the second chamfers 132, so that the problem of stress concentration at the first chamfers 131 and the second chamfers 132 can be improved, and the probability of cracks generated in the bending region 13 is reduced. According to experimental data, compared with the prior art, in the unbent state of the flexible display panel, the stress of the first chamfer 131 or the second chamfer 132 may be reduced by about 10%, and in the bent state, the stress of the first chamfer 131 or the second chamfer 132 may be reduced by about 50%.

As shown in fig. 6, the embodiment takes a round shape as an example, so as to obtain a flexible display panel in which a display area of the first non-bending area 11 and a binding area of the flexible circuit board 17 are larger, and an area of the bending area 13 is smaller.

For the first chamfer 131 and the second chamfer 132, the first chamfer 131 and the second chamfer 132 are both fillet-processed, the radius of curvature of the fillet is 0.5mm-2mm, the reinforcing layer 2 covers the first chamfer 131, and the reinforcing layer 2 covers the second chamfer 132. Further, in order to prevent stress concentration, the bending region 13 is a structure that is tapered from the first connection portion and the second connection portion to the middle portion, that is, the bending region 13 is a waist-shaped structure with a narrow middle portion and wide two sides in the unfolded state, so that the bending region 13 does not have included angles on both sides except for forming a first chamfer 131 between the bending region 13 and the first non-bending region 11 and forming a second chamfer 132 between the bending region 13 and the second non-bending region 12, and the stress concentration in the bending region 13 is reduced, and the risk of cracks generated in the bending region 13 is reduced.

In combination with the above description, bending region 13 all has the chamfer everywhere when being connected with first non-bending region 11 and second non-bending region 12, stress distribution is in each chamfer before buckling, under the effect of strengthening layer 2 after buckling, bending region 13 stress concentration's condition is alleviated, and, the setting of fillet makes when flexible screen has the radian, the more natural smoothness of first meeting department and the transition of second meeting department, and can further reduce bending region 13 and locate the stress concentration's phenomenon at each chamfer after buckling, prevent to produce the crackle.

Preferably, in order to better solve the problem of stress concentration at each chamfer, the reinforcing layer 2 may be extended, and the reinforcing layer 2 mainly has the following three extension modes:

the first method is as follows: the orthographic projection of the strengthening layer 2 on the substrate base plate and the orthographic projection of the first non-bending area 11 on the substrate base plate have an overlapping part;

the second method comprises the following steps: the orthographic projection of the strengthening layer 2 on the substrate base plate and the orthographic projection of the second non-bending area 12 on the substrate base plate have an overlapping part;

a third mode; the strengthening layer 2 is in the orthographic projection of the substrate base plate and the orthographic projection of the substrate base plate in the first non-bending area 11 have an overlapping part, and the strengthening layer 2 is in the orthographic projection of the substrate base plate and the orthographic projection of the second non-bending area 12 have an overlapping part.

Further, as shown in fig. 8-9, it can be seen from simulation that the maximum stress in each chamfer is reduced by about 10% before bending and about 50% after bending.

It should be noted that the reinforcing layer 2 may extend to the first non-bending region 11 and the second non-bending region 12, but for the purpose of mounting other layers, the reinforcing layer 2 may not completely cover the first non-bending region 11 and the second non-bending region 12, so as to prevent the reinforcing layer 2 from interfering with other structures.

As shown in fig. 10 to 11, the flexible display panel further includes a back film 14, and the back film 14 and the stiffening layer 2 are respectively located at two opposite sides of the flexible display panel; the back membrane 14 has a thinning area 143 at the bending area 13, and the thickness of the thinning area 143 in the direction perpendicular to the substrate base plate is smaller than the thickness of other areas of the back membrane 14 in the direction perpendicular to the substrate base plate.

Specifically, the back film 14 includes a first back film 141, a second back film 142 and the thinned region 143, the first non-bending region 11 is attached to the first back film 141, the second non-bending region 12 is attached to the second back film 142, and the bending region 13 is attached to the thinned region 143.

Wherein the thickness of the first back film 141 and the second back film 142 is greater than the thickness of the thinning-out region 143. Generally, the thickness of the thinned region 143 needs to be smaller than the thickness of the first and second back films 141 and 142, and further, for the purpose of protecting the bending portion, the thickness value of the thinned region 143 may be reduced to 0 μm, so as to prevent the cracking of the bending portion 13.

In the alternative of this embodiment, stiffening layer 2 includes front stiffening layer 21 and back stiffening layer 22, front stiffening layer 21 is located first connecting portion with bending zone 13 deviates from one side of notacoria 14, back stiffening layer 22 is located notacoria 14 deviates from one side of front stiffening layer 21, front stiffening layer 21 at the orthographic projection of substrate base plate with back stiffening layer 22 does not have the overlap portion at the orthographic projection of substrate base plate.

In an alternative of this embodiment, an orthographic projection of the front reinforcing layer 21 on the substrate covers an orthographic projection of the first chamfer 131 on the substrate, and an orthographic projection of the rear reinforcing layer 22 on the substrate covers an orthographic projection of the second chamfer 132 on the substrate.

In an alternative of this embodiment, the stiffening layer 2 has a trapezoidal shape in a plane perpendicular to the base substrate.

In some embodiments, as shown in fig. 5, in view of the higher requirements for the bending performance of the flexible display panel due to the miniaturization of the flexible display panel, the product must realize 180 ° bending at a narrower bending width. This requirement is particularly convex on a circular flexible display panel, and thus the bending angle between the first non-bending region 11 and the second non-bending region 12 is 180 °, i.e. the bending angle of the bending region 13 is 180 °.

Further, as shown in fig. 5, a support layer 16 is further included; the support layer 16 is located between the first non-bending zone 11 and the second non-bending zone 12. The support layer 16 is located between the first back film 141 and the second back film 142, and is used for supporting the bent flexible display panel, and the support layer 16 may specifically be a rigid support layer, and/or an elastic support layer.

When the support layer 16 is an elastic support layer, the elastic support layer has a certain resilience, and the resilience of the elastic support layer is greater than the resilience of the first non-bending region 11 and the second non-bending region 12. Through set up the elastic support layer between first non-bending area 11 and second non-bending area 12 for flexible display panel is at the in-process that the back expanded of buckling, the elastic support layer is good because its self resilience performance, can provide supplementary restoring force to first non-bending area 11 and second non-bending area 12 simultaneously at the in-process of resilience, makes flexible display panel can resume the state of flattening completely after buckling, avoids producing long-term bending crease and even crackle, has promoted flexible display panel's yield and performance.

More specifically, the elastic support layer is in a grid shape. Specifically, the grid of the elastic supporting layer comprises routing parts and hollow parts, the routing parts are mutually staggered, and the hollow parts are formed at the hollow positions of the routing parts. The hollowed-out portion 22 may be one or more of rectangular, diamond, circular or oval. The material of the elastic supporting layer is metal. Specifically, the metal of which the elastic support layer is made is titanium. In this embodiment, the elastic support layer is disposed between the first non-bending area 11 and the second non-bending area 12, so that the first non-bending area 11 and the second non-bending area 12 completely wrap the routing portion, and the elastic support layer is better combined with the first non-bending area 11 and the second non-bending area 12 by using the good buffering property and the good combining property of the organic material forming the first non-bending area 11 and the second non-bending area 12. And the latticed elastic supporting layer can better release the stress of the first non-bending area 11 and the second non-bending area 12 in the bending process.

When the support layer 16 is a combination of an elastic support layer and a rigid support layer, the elastic support layer and the rigid support layer are stacked between the first non-bending region 11 and the second non-bending region 12, wherein the rigid support layer is attached to the first non-bending region 11 and the second non-bending region, the elastic support layer is located between the rigid support layers, the rigid support layer is used for supporting the flexible display panel to keep the flexible display panel flat, and the elastic support layer is used for applying an acting force to restore the original state to the flexible display panel when the flexible display panel is deformed.

Here, in order to avoid the stress concentration at the bending region 13 from generating cracks after bending, the support layer 16 is not provided at the thinned region 143 of the bending region 13.

Furthermore, a connection medium layer is further disposed between the reinforcing layer 2 and the first connection portion, the second connection portion and the bending region 13, the connection medium layer is used for adhering the first connection portion, the second connection portion and the bending region 13 to the reinforcing layer 2, and has thermal conductivity and flexibility, and a plurality of stress release holes for reducing elastic stress are disposed in the reinforcing layer 2 in an array manner. The first connecting portion, the second connecting portion and the bending region 13 are adhered to the reinforcing layer 2 through the connecting medium layer with thermal conductivity and flexibility, and a plurality of stress holes for reducing elastic stress are formed in the reinforcing layer 2, so that the flexibility of the flexible display panel is ensured, and meanwhile, the heat dissipation performance, the anti-electromagnetic interference capability and the anti-electrostatic interference capability of the flexible display device are also enhanced.

In an alternative of the embodiment of the present application, the stiffening layer 2 is widely used in flexible circuit boards in electronic products. The reinforcing layer 2 mainly solves the flexibility of the flexible circuit board, improves the strength of the insertion part and facilitates the integral assembly of the product. Wherein the stiffening layer 2 may cover the respective chamfers in order to increase the strength of the inflection zones 13 and the respective chamfers and to reduce the likelihood of cracks occurring.

The reinforcing layer 2 is an acrylic layer made of acrylic, the acrylic raw material is polymethyl methacrylate and is formed by polymerizing methyl methacrylate monomers, the transparency and the transmittance of the acrylic are similar to those of glass, the acrylic is applied to a display device, and on the basis of not influencing the transparency, the first chamfer and the second chamfer are covered, so that the probability of cracks is reduced.

For the completeness of the scheme, the flexible display panel further comprises a membrane assembly and a cover plate, wherein the membrane assembly is arranged on one side, away from the second non-bending area 12, of the first non-bending area 11 in a laminated mode, and comprises at least one of a polarizer and a touch panel; the cover plate is arranged on one side of the membrane assembly far away from the panel in a stacked mode. Specifically, this diaphragm subassembly is including the first adhesive linkage, the polaroid, the second adhesive linkage, touch panel and the third adhesive linkage that stack gradually the setting, and first adhesive linkage is located between polaroid and first non-bending zone 11, and the third adhesive linkage is located between touch panel and the apron, in this embodiment, because touch panel is more close to the apron, can make touch panel feel better the touch of using the user's finger like this to be favorable to improving touch panel's sensitivity.

The flexible display panel is an active matrix organic light emitting diode display panel, and the flexible display panel can be bent, specifically, the flexible display panel can be a display panel bent along a fixed axis, or a display panel bent at will without limitation to the axis.

According to a second aspect of the embodiments of the present application, as shown in fig. 6, there is provided a display device, including a flexible circuit board 17 and the flexible display panel according to any one of the embodiments of the first aspect: the flexible printed circuit 17 is connected to the lower side of the second non-bending region 12, that is, the second non-bending region 12 is away from the side of the display direction, and the first non-bending region 11 is in the display direction.

In addition, the flexible printed circuit board further comprises a plurality of wiring harnesses, and the bent area 13 is used for enabling the first non-bent area 11 and the flexible printed circuit board 17 to be electrically connected through the plurality of wiring harnesses. In addition, the display device further includes a housing, and the flexible wiring board 17 and the flexible display panel are disposed in the housing. The display device of the embodiment of the application has the same advantages as the flexible display panel, and is not repeated herein.

According to a third aspect of embodiments of the present application, there is provided a terminal device including the display apparatus of the second aspect. The terminal device in the embodiment of the application has the same advantages as the flexible display panel, and is not repeated herein.

It should be noted that the terminal device of the present embodiment includes, but is not limited to, a mobile phone, a wearable device, a vehicle, and a television.

It is noted that in the description and claims of the present application and in the above-mentioned drawings, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.

Also, the terms "comprises," "comprising," and "having," as well as any variations thereof or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications and changes to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (12)

1. A flexible display panel is characterized by comprising a substrate base plate, and a bending area, a first non-bending area and a second non-bending area which are positioned on the substrate base plate, wherein the first non-bending area and the second non-bending area are positioned on two sides of the bending area, and the first non-bending area is a display area;

the bending area is provided with a first connecting part connected with the first non-bending area, the bending area is provided with a second connecting part connected with the second non-bending area, two first chamfers are arranged on two opposite sides of the first connecting part separated from the first non-bending area, and two second chamfers are arranged on two opposite sides of the second connecting part separated from the second non-bending area;

the flexible display panel further comprises a reinforcing layer, the reinforcing layer is attached to the flexible display panel, and the reinforcing layer is arranged on the orthographic projection of the substrate base plate to cover the first chamfer and the second chamfer.

2. The flexible display panel of claim 1, wherein the first and second chamfers are rounded corners.

3. The flexible display panel of claim 2, wherein the radius of curvature of the rounded corners is 0.5mm-2 mm.

4. The flexible display panel according to claim 1, wherein an orthographic projection of the stiffening layer on the substrate base plate and an orthographic projection of the first non-bending region on the substrate base plate have an overlapping portion, and/or an orthographic projection of the stiffening layer on the substrate base plate and an orthographic projection of the second non-bending region on the substrate base plate have an overlapping portion.

5. The flexible display panel according to claim 1, wherein the flexible display panel further comprises a back film, the back film and the stiffening layer being respectively located on opposite sides of the flexible display panel; the back membrane is provided with a thinning area in the bending area, and the thickness of the thinning area in the direction vertical to the substrate base plate is smaller than that of other areas of the back membrane in the direction vertical to the substrate base plate.

6. The flexible display panel according to claim 5, wherein the reinforcement layer comprises a front reinforcement layer and a back reinforcement layer, the front reinforcement layer is disposed on the first connecting portion and on a side of the bending region away from the back film, the back reinforcement layer is disposed on a side of the back film away from the front reinforcement layer, and an orthogonal projection of the front reinforcement layer on the substrate does not have an overlapping portion with an orthogonal projection of the back reinforcement layer on the substrate.

7. The flexible display panel of claim 6, wherein an orthographic projection of the front stiffening layer on the substrate base covers an orthographic projection of the first chamfer on the substrate base, and an orthographic projection of the back stiffening layer on the substrate base covers an orthographic projection of the second chamfer on the substrate base.

8. The flexible display panel of claim 1, wherein the stiffening layer has a trapezoidal shape in a plane perpendicular to the substrate base.

9. The flexible display panel of claim 1, wherein the stiffening layer is an acrylic layer.

10. A display device comprising a flexible wiring board and the flexible display panel according to any one of claims 1 to 9:

the flexible circuit board is connected to the lower side of the second non-bending area.

11. A terminal device characterized by comprising the display apparatus according to claim 10.

12. The terminal device of claim 11, wherein the terminal device comprises a mobile phone, a wearable device, a vehicle-mounted screen, or a television.

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