CN109859642B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN109859642B CN109859642B CN201811543503.8A CN201811543503A CN109859642B CN 109859642 B CN109859642 B CN 109859642B CN 201811543503 A CN201811543503 A CN 201811543503A CN 109859642 B CN109859642 B CN 109859642B
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Abstract
The embodiment of the invention discloses a display panel and a display device, wherein the display panel comprises: the flexible substrate comprises a first non-bending area, a second non-bending area and a bending area positioned between the first non-bending area and the second non-bending area, and the flexible substrate comprises a first surface and a second surface which are deviated from each other; the display layer is positioned on the first surface of the flexible substrate and positioned in the first non-bending area; the first protective layer is positioned on the first surface of the flexible substrate and at least covers the bending area of the flexible substrate; the second protective layer is positioned on one side of the first protective layer, which is far away from the flexible substrate, and at least covers the part of the joint of the bending area and the first non-bending area, and/or at least covers the part of the joint of the bending area and the second non-bending area.
Description
Technical Field
The present invention relates to display technologies, and in particular, to a display panel and a display device.
Background
With the development of display technology, the application of display technology is becoming more and more extensive, and among them, an Organic Light-Emitting Diode (OLED) display has the advantages of self-luminescence, fast response, wide viewing angle, high brightness, bright color, lightness and thinness, etc., so the OLED display is more widely applied.
At present, full-screen mobile phones are more and more popular, and screens with high screen occupation ratios are more and more popular, so that a plurality of narrow-frame schemes are promoted, and in the scheme of improving the screen occupation ratios by aiming at the area of a lower frame, the part of a flexible substrate, which is positioned at the position of the lower frame, is bent to the back of a display area so as to reduce the width of the lower frame. How to guarantee the bending characteristic of the bending area and improve the yield of the display panel in the bending process of the display panel becomes a problem to be solved urgently.
Disclosure of Invention
The invention provides a display panel and a display device, which are used for protecting a bending area of the display panel and avoiding poor display caused by bending stress of the display panel at a stress concentration position.
In a first aspect, an embodiment of the present invention provides a display panel, including:
the flexible substrate comprises a first non-bending area, a second non-bending area and a bending area positioned between the first non-bending area and the second non-bending area, and the flexible substrate comprises a first surface and a second surface which are deviated from each other;
a display layer on the first surface of the flexible substrate and in the first non-bending region;
the first protective layer is positioned on the first surface of the flexible substrate and at least covers the bending area of the flexible substrate;
the second protective layer is positioned on one side, away from the flexible substrate, of the first protective layer and at least covers a part of joint of the bending area and the first non-bending area and/or at least covers a part of joint of the bending area and the second non-bending area.
Optionally, the elastic modulus of the second protective layer is greater than the elastic modulus of the first protective layer.
Optionally, the thickness of the second protection layer gradually decreases along a direction parallel to the plane of the first non-bending region or the second non-bending region and away from the maximum thickness of the second protection layer.
Optionally, a distance between a connection point of the bending region and the first non-bending region and a projection of a maximum thickness position of the second protection layer on the flexible substrate is less than or equal to 100 μm, and/or a distance between a connection point of the bending region and the second non-bending region and a projection of a maximum thickness position of the second protection layer on the flexible substrate is less than or equal to 100 μm.
Optionally, in a state where the flexible substrate is flat, a length of the second protective layer is less than or equal to 500 μm in a direction from the first non-bending region to the bending region.
Optionally, the second protection layer is in a long strip shape and extends along a direction parallel to a connection line of the bending region and the first non-bending region, and/or extends along a direction parallel to a connection line of the bending region and the second non-bending region.
Optionally, the second protection layer is a plurality of discrete protection structures, and the plurality of discrete protection structures are sequentially distributed in a direction parallel to the connecting line of the bending region and the first non-bending region, and/or sequentially distributed in a direction parallel to the connecting line of the bending region and the second non-bending region.
Optionally, the display panel further includes a supporting plate, the supporting plate includes a first portion and a second portion, the supporting plate is located on the second surface of the flexible substrate, the first portion is located in the first non-bending region, and the second portion is located in the second non-bending region.
Optionally, the display panel further includes a bending support body, the bending support body includes a fixed connection portion and a bending support portion that are connected to each other, and the fixed connection portion is sandwiched between the first non-bending region and the second non-bending region; the bending support part is adjacent to the bending area, and one side of the bending support part, which faces the bending area, is an arc surface.
Optionally, the first non-bending region includes a display region, a heat dissipation layer is disposed on a side of the first portion of the support plate away from the flexible substrate, and the heat dissipation layer is located in the display region;
the fixed connection part of the bent support body comprises a first surface and a second surface which are mutually deviated, the first surface of the fixed connection part is fixedly bonded with the heat dissipation layer, and the second surface of the fixed connection part is fixedly bonded with the second part of the support plate.
Optionally, the heat dissipation layer comprises a foam layer, a graphite layer and a copper foil layer;
the first surface of the fixed connecting portion and the second surface of the fixed connecting portion are respectively provided with a first adhesive layer and a second adhesive layer, the first adhesive layer is bonded and fixed to the fixed connecting portion and the heat dissipation layer, and the second adhesive layer is bonded and fixed to the fixed connecting portion and the second portion of the supporting plate.
Optionally, the first protective layer and the second protective layer comprise UV curable glue.
Optionally, the thickness of the first protection layer ranges from 30 μm to 150 μm, and the thickness of the second protection layer ranges from 30 μm to 150 μm.
In a second aspect, an embodiment of the present invention further provides a display device, including the display panel according to any one of the first aspect.
According to the display panel and the display device provided by the embodiment of the invention, the first protective layer covers at least the bending area on the first surface of the flexible substrate, the second protective layer is arranged on one side of the first protective layer, which is far away from the flexible substrate, and the second protective layer at least covers the part of the joint of the bending area of the flexible substrate and the first non-bending area and/or at least covers the part of the joint of the bending area of the flexible substrate and the second non-bending area, so that the bending area is further protected, stress concentration position stress of the flexible substrate during bending can be reduced, the protection of the bending stress concentration position of the flexible substrate is enhanced, poor display caused by bending stress of the display panel at the stress concentration position is avoided, the stability of the display panel is improved, and the yield of the display panel is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 2 is a front view of the display panel shown in FIG. 1;
fig. 3 is a front view of a display panel according to another embodiment of the present invention in a flat state;
FIG. 4 is a top view of the display panel shown in FIG. 3;
FIG. 5 is a top view of a display panel according to another embodiment of the present invention in a flat state;
fig. 6 is a front view of still another display panel provided by an embodiment of the present invention;
fig. 7 is a front view of still another display panel provided by an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Traditional display panel can cause the district's of buckling radian too big because stress is too big when buckling to the flexible substrate can set up the wiring in the part of frame position down, and the district's of buckling radian too big also can lead to the walking line emergence fracture in the district of buckling. According to the display panel and the display device provided by the embodiment of the invention, the first protective layer covers at least the bending area on the first surface of the flexible substrate, the second protective layer is arranged on one side of the first protective layer, which is far away from the flexible substrate, and the second protective layer at least covers the part of the joint of the bending area of the flexible substrate and the first non-bending area and/or at least covers the part of the joint of the bending area of the flexible substrate and the second non-bending area. The invention can strengthen the protection of the stress concentration position of the flexible substrate bending, avoid the display failure caused by the bending stress of the display panel at the stress concentration position, improve the stability of the display panel and ensure the yield of the display panel.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and fig. 2 is a front view of the display panel shown in fig. 1, and referring to fig. 1 and fig. 2, the display panel includes: the flexible substrate 10 comprises a first non-bending region 11, a second non-bending region 12 and a bending region 13 located between the first non-bending region 11 and the second non-bending region 12, and the flexible substrate 10 comprises a first surface 101 and a second surface 102 which are mutually deviated; the display layer 20 is positioned on the first surface 101 of the flexible substrate 10 and positioned in the first non-bending area 11; the first protective layer 31 is positioned on the first surface 101 of the flexible substrate 10, and at least covers the bending area 13 of the flexible substrate 10; and the second protective layer 32 is positioned on one side of the first protective layer 31, which is far away from the flexible substrate 10, and at least covers a part of the joint of the bending region 13 and the first non-bending region 11, and/or at least covers a part of the joint of the bending region 13 and the second non-bending region 12.
In the display panel, the flexible substrate 10 is made of a flexible material, such as a polyimide material, and after the display layer 20 is formed on the flexible substrate 10, one side edge of the flexible substrate 10 is bent to the back side, so as to connect the traces on the flexible substrate 10 with the driving circuit, thereby implementing display driving of the display layer 20. The display layer 20 includes an array of organic light emitting units, wherein the organic light emitting units emit light under the driving of the driving circuit, and form a display image of the display panel through the coordination of light emitting colors. The flexible substrate 10 may be divided into bending regions 13 according to bending positions, and the non-bending portions of the flexible substrate 10 connected to two sides of the bending regions 13 are referred to as a first non-bending region 11 and a second non-bending region 12, respectively. Usually, bending region 13 is when buckling, and the angle of buckling is the fillet, but when the stress of buckling is great, when the radian of buckling is great, the line of walking that sets up on bending region 13 this moment can break, influences display panel's normal work. In order to prevent the bending region from being affected by the bending stress at the stress concentration position, the first protection layer 31 and the second protection layer 32 are provided in the display panel according to the embodiment of the invention, and specifically, the first protection layer 31 and the second protection layer 32 may be bonded to and protected by the bending region 13 using a glue material. The first protection layer 31 covers the bending region 13 as a whole, so that the stress of the bending region 13 can be relieved as a whole, the bending region 13 is protected as a whole, and the probability that the bending region 13 is affected by the bending stress at the stress concentration position is reduced to a certain extent; the second protection layer 32 protects the stress concentration position of the flexible substrate 10 when the bending region 13 is bent, i.e., the joint between the bending region and the non-bending region, as shown in the cross-sectional view of the display panel shown in fig. 2, the joint between the bending region and the non-bending region represents the connection line between the bending region and the non-bending region and the area near the connection line, and the joint has a certain width. The first protective layer 31 can relieve stress at the stress concentration position where it covers when bent, so that stress concentration at the covering position can be avoided.
According to the display panel provided by the embodiment of the invention, the first protective layer covers at least the bending area on the first surface of the flexible substrate, the second protective layer is arranged on one side of the first protective layer, which is far away from the flexible substrate, and the second protective layer at least covers the part of the joint of the bending area of the flexible substrate and the first non-bending area, and/or at least covers the part of the joint of the bending area of the flexible substrate and the second non-bending area, so that the bending area can be protected, stress concentration position stress of the flexible substrate during bending can be reduced, the protection of the bending stress concentration position of the flexible substrate is enhanced, poor display caused by bending stress of the display panel at the stress concentration position is avoided, the stability of the display panel is improved, and the yield of the display panel is ensured.
It should be noted that the first non-bending region 11 and the second non-bending region 12 are not limited to be straight structures, and also belong to a part of the flexible substrate 10, so the first non-bending region 11 and the second non-bending region 12 may also be flexible structures, when the display panel is a flexible display panel, the first non-bending region 11 and the second non-bending region 12 may be bent according to the use of a user, and the division of the bending region and the non-bending region is only used for distinguishing the portion of the flexible substrate 10 bent to connect the back driving circuit.
Referring to fig. 2, the display panel further includes a support plate 40, the support plate 40 includes a first portion 41 and a second portion 42, the support plate 40 is located on the second surface 102 of the flexible substrate 10, the first portion 41 is located in the first non-bending region 11, and the second portion 42 is located in the second non-bending region 12. In order to support the flexible substrate 10 when manufacturing a rigid display panel, the support plate 40 is disposed on the second surface 102 of the flexible substrate 10, and the region of the flexible substrate 10 not supported by the first portion 41 and the second portion 42 of the support plate 40 is the bending region 13. Since the supporting plate 40 is a rigid structure, stress is concentrated on the edge of the supporting plate 40 when the flexible substrate 10 is bent, so that stress is concentrated on the connecting line between the bent region 13, which is the edge of the first portion 41 and the second portion 42, and the first non-bent region 11 and the second non-bent region 12, and display defects of the display panel are easily caused by the stress.
Alternatively, the first protective layer and the second protective layer may be made of a material including UltraViolet (UV) curable glue, and the UV curable glue may be shielded from visible light and may have relatively small stress compared to the UV curable glue and the visible light curable glue. However, because the UV curing glue has different components, the protection capability of the UV curing glue to the bending area is different, and experimental data statistics shows that different UV curing glue has obviously different bending yield to the display panel under the same experimental condition, wherein the UV curing glue with higher young modulus has the best bending yield, and the UV curing glue with lower young modulus has the lowest bending yield. Therefore, the same UV curing adhesive material may be used for the first protective layer and the second protective layer, and UV curing adhesives having different compositions may be used according to their respective functions. In addition, in order to take both the protection capability and the intrinsic stress of the first protective layer and the second protective layer into consideration, the film thicknesses of the first protective layer and the second protective layer cannot be too small or too thick, and optionally, the thickness range of the first protective layer is 30-150 μm, and the thickness range of the second protective layer is 30-150 μm. The thickness of the first protective layer and the second protective layer is set to be larger than or equal to 30 micrometers, the problem that the bending stress of the covering position of the first protective layer and the second protective layer cannot be relieved due to the fact that the thickness of the first protective layer and the second protective layer is too small can be prevented, the thickness of the first protective layer and the second protective layer is set to be smaller than or equal to 150 micrometers, and the problem that the edge of the protective layer is strong and new stress concentration positions are generated again when the thickness of the protective layer is too large can be avoided.
Since the stress at the joint of the non-bending region and the bending region is relatively large, in order to relieve the stress here, it is preferable that the elastic modulus of the second protective layer is larger than that of the first protective layer. The elastic modulus is an index for measuring the difficulty of the material in elastic deformation, and the larger the value of the elastic modulus is, the larger the stress for causing the material to generate certain elastic deformation is, that is, the higher the rigidity of the material is, that is, the smaller the elastic deformation is generated under the action of certain stress. Therefore, the rigidity of the second protection layer with a large elastic modulus is large, the rigidity strength of the covering position of the second protection layer can be improved during bending, and the stress of the covering position can be relieved, so that the non-bending area and the bending area covered by the second protection layer can be prevented from being influenced by the stress in the bending state to cause poor display of the display panel.
Fig. 3 is a front view of another display panel provided in an embodiment of the invention in a flat state, referring to fig. 3, wherein the display panel is in the flat state before being bent, and at this time, as the second protection layer 32 only covers at least a portion of a connection between the non-bent region and the bent region, when the bent region 13 is bent, the second protection layer 32 may affect stress distribution when the bent region 13 is bent, and in order to avoid the edge of the second protection layer 32 becoming a stress concentration position, the second protection layer 32 may be disposed along a direction parallel to a plane of the first non-bent region 11 or the second non-bent region 12 and away from a maximum thickness of the second protection layer 32, and a thickness of the second protection layer 32 is gradually reduced. At this time, the thickness of the second protection layer 32 gradually decreases from the middle position to the edge position, that is, there is no obvious step at the edge of the second protection layer 32, and the stress of the bending region is not concentrated at the edge of the second protection layer 32 when bending, in addition, because there is no obvious step at the edge position of the second protection layer 32, the edge position of the second protection layer 32 can be tightly bonded with the first protection layer 31 in the bending process and in the bending state, and the edge position is prevented from cracking from the first protection layer 31.
With reference to fig. 3, when the second protection layer 32 is formed by UV-curable adhesive or other materials, a position with the maximum thickness is generated, and in order to ensure the protection effect of the second protection layer 32 on the joint of the non-bending region and the bending region, it is necessary to ensure that the position with the maximum thickness of the second protection layer 32 is located at the joint of the non-bending region and the bending region as much as possible. Therefore, optionally, a distance L1 of a projection of a joint of the bending region 13 and the first non-bending region 11 and a maximum thickness position of the second protective layer 32 on the flexible substrate 10 is less than or equal to 100 μm, and/or a distance L2 of a projection of a joint of the bending region 13 and the second non-bending region 12 and a maximum thickness position of the second protective layer 32 on the flexible substrate 10 is less than or equal to 100 μm. At this time, the maximum thickness position of the second protection layer 32 is adjacent to the joint of the non-bending area and the bending area, i.e., the stress concentration position, and the rigidity strength of the joint of the non-bending area and the bending area can be significantly increased, so that the effect of the second protection layer 32 for mainly protecting the stress concentration position is ensured, and the phenomenon that the display panel is poor in display due to overlarge stress at the joint is prevented.
Besides, in order to ensure the protective effect of the second protective layer, it is necessary to appropriately set the width of the second protective layer to completely cover the connection of the non-bending region and the bending region, and therefore, optionally, in a state where the flexible substrate 10 is flat, the length d of the second protective layer 32 is less than or equal to 500 μm in a direction from the first non-bending region 11 to the bending region 13. The first protective layer covers the bending area integrally, so that the stress of the bending area can be relieved to a certain extent, and the second protective layer is not required to be too wide; by setting the width of the second protection layer to be less than or equal to 500 micrometers, the stress relief of the second protection layer can be prevented from being dispersed at other positions of non-connection positions when the width is too wide, and the second protection layer is guaranteed to only perform stress protection on the connection positions of the non-bending area and the bending area.
As for the shape structure of the second protective layer, two alternatives are also provided by the embodiment of the present invention, fig. 4 is a bottom view of the display panel shown in fig. 3, and referring to fig. 4, wherein, alternatively, the second protective layer 32 may be provided in a strip shape and extend in a direction parallel to the connection line of the bending region 13 and the first non-bending region 11, and/or extend in a direction parallel to the connection line of the bending region 13 and the second non-bending region 12. The strip-shaped second protective layer 32 can completely cover the connecting wires in the extending direction of the connecting wires, so that the stress concentration positions where the connecting wires are located can be protected.
Fig. 5 is a bottom view of another display panel provided by an embodiment of the present invention in a flat state, and referring to fig. 5, optionally, the second protective layer may be further provided as a plurality of discrete protective structures 321, and the plurality of discrete protective structures 321 are sequentially distributed in a direction parallel to a connecting line of the bending region 13 and the first non-bending region 11, and/or sequentially distributed in a direction parallel to a connecting line of the bending region 13 and the second non-bending region 12.
When the second protection layer 32 is made of a UV adhesive material, the discrete protection structures 321 may be adhesive dots formed by dispensing the UV adhesive, or a strip-shaped adhesive tape with a short length formed by coating. Compared with the elongated structure shown in fig. 4, the discrete protection structure 321 reduces the amount of UV glue used, and can avoid the problem that the elongated structure has strong rigidity and is likely to generate a new stress concentration position when relieving the stress at the stress concentration position. It should be noted that, in the extending direction of the connection line, the distance between the discrete protection structures 321 cannot be too large, and the problem of large bending stress at the uncovered connection line needs to be considered when the discrete protection structures 321 are arranged, and specifically, a person skilled in the art can design the connection line according to practical situations.
Referring to fig. 6, the display panel further includes a connector 50, the connector 50 is clamped between a first non-bending region 11 and a second non-bending region 12, the first non-bending region 11 includes a display region 110, a heat dissipation layer 60 is disposed on a side of the first portion 41 of the support plate away from the flexible substrate 10, the heat dissipation layer 60 is disposed on the display region 110, the connector 50 includes a first surface 501 and a second surface 502 that are away from each other, the first surface 501 of the connector 50 is fixedly bonded to the heat dissipation layer 60, and the second surface 502 of the connector 50 is fixedly bonded to the second portion 42 of the support plate.
Specifically, the heat dissipation layer may include a foam layer, a graphite layer, and a copper foil layer (not shown in the drawings); the first surface 501 and the second surface 502 of the connector 50 are respectively provided with a first adhesive layer 71 and a second adhesive layer 72, the first adhesive layer 71 adheres the connector 50 and the heat dissipation layer 60, and the second adhesive layer 72 adheres the connector 50 and the second portion 42 of the support plate.
Wherein, the cotton layer of bubble is mostly the cotton net of bubble glue for the laminating is in the second portion of backup pad, and can prevent the bubble that the laminating produced, graphite layer and copper foil layer then are used for the heat dissipation, and graphite layer mainly used soaking, and the copper foil layer can also play the effect of shielding external signal interference in the radiating. Of course, those skilled in the art can select each functional layer stacked in the heat dissipation layer according to the actual design, and the stacking of the foam layer, the graphite layer and the copper foil layer in the heat dissipation layer in this embodiment is only a preferred example and is not limited herein.
Furthermore, in order to ensure that the bending radian of the bending region 13 after bending can be supported, and prevent the display panel from being deformed by external force in the use process of the display panel, which causes the display panel to display badly and the like, a bending support body can be arranged in the display panel. Fig. 7 is a front view of another display panel provided in an embodiment of the present invention, and referring to fig. 7, the display panel further includes a bending support body, the bending support body includes a fixed connection portion 51 and a bending support portion 52 connected to each other, the fixed connection portion 51 is interposed between the first non-bending region 11 and the second non-bending region 12; the bending support portion 52 is adjacent to the bending region 13, and a side of the bending support portion 52 facing the bending region 13 is a curved surface. At this time, the bending support body can support the bending region 13 in the bending process of the bending region 13 and the use process of the display panel, so as to maintain the bending radian of the bending region 13.
However, in the display panel shown in fig. 1 to 6, in the actual bending process, the second non-bending region 12 of the flexible substrate is usually pulled and bent backward, so that the stress concentration position during bending exists more at the connection line position of the first non-bending region 11 and the bending region 13, and relatively, the connection line position stress of the second non-bending region 12 and the bending region 13 is relatively small, so that the second protective layer 32 can be provided only at the connection line position of the first non-bending region 11 and the bending region 13. For the display panel shown in fig. 7, in the bending process, the bending support body is first fixed to the first non-bending region 11 of the flexible substrate 10, and then the second non-bending region 12 of the flexible substrate 10 is pulled to realize bending of the bending region 13, and the bending support body supports the bending region 13, so that bending stress is more concentrated on the connecting line between the second non-bending region 12 and the bending region 13, and the second protection layer 32 can be only disposed at the connecting line between the second non-bending region 12 and the bending region 13.
With continued reference to fig. 7, the first non-bending region 11 includes a display region 110, a heat dissipation layer 60 is disposed on a side of the first portion 41 of the supporting board away from the flexible substrate 10, and the heat dissipation layer 60 is located in the display region 110; the fixing connection part 51 of the bending support body comprises a first surface 511 and a second surface 512 which are mutually deviated, the first surface 511 of the fixing connection part 51 is fixedly bonded with the heat dissipation layer 60, and the second surface 512 of the fixing connection part 51 is fixedly bonded with the second part 42 of the support plate.
Specifically, the first surface 511 of the fixed connection portion 51 and the second surface 512 of the fixed connection portion 51 are further provided with a first adhesive layer 71 and a second adhesive layer 72, respectively, the first adhesive layer 71 bonds the fixed connection portion 51 and the heat dissipation layer 60, and the second adhesive layer 72 bonds the fixed connection portion 51 and the second portion 42 of the support plate.
Fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 8, the display device includes any one of the display panels 100 according to an embodiment of the present invention. Since the display device employs the display panel 100, the display device also has the advantages of the display panel of the above embodiment. It should be noted that the display device provided in the embodiment of the present invention may further include other circuits and devices for supporting normal operation of the display device. The display device can be one of a mobile phone, a tablet personal computer, electronic paper and an electronic photo frame.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (13)
1. A display panel, comprising:
the flexible substrate comprises a first non-bending area, a second non-bending area and a bending area positioned between the first non-bending area and the second non-bending area, and the flexible substrate comprises a first surface and a second surface which are deviated from each other;
a display layer on the first surface of the flexible substrate and in the first non-bending region;
the first protective layer is positioned on the first surface of the flexible substrate and at least covers the bending area of the flexible substrate;
the second protective layer is positioned on one side, away from the flexible substrate, of the first protective layer and at least covers a part of the joint of the bending area and the first non-bending area and/or at least covers a part of the joint of the bending area and the second non-bending area;
the elastic modulus of the second protective layer is greater than the elastic modulus of the first protective layer.
2. The display panel according to claim 1, wherein the thickness of the second protective layer is gradually reduced along a direction parallel to a plane of the first non-bending region or the second non-bending region and away from the maximum thickness of the second protective layer.
3. The display panel according to claim 2,
the distance between the joint of the bending region and the first non-bending region and the projection of the maximum thickness position of the second protection layer on the flexible substrate is smaller than or equal to 100 mu m, and/or the distance between the joint of the bending region and the second non-bending region and the projection of the maximum thickness position of the second protection layer on the flexible substrate is smaller than or equal to 100 mu m.
4. The display panel according to claim 2, wherein a length of the second protective layer is less than or equal to 500 μm in a direction from the first non-bending region toward the bending region in a state where the flexible substrate is flat.
5. The display panel according to claim 2, wherein the second protective layer is long and extends in a direction parallel to a connection line of the bent region and the first non-bent region and/or in a direction parallel to a connection line of the bent region and the second non-bent region.
6. The display panel according to claim 2, wherein the second protection layer is a plurality of discrete protection structures, and the plurality of discrete protection structures are sequentially distributed in a direction parallel to a connecting line of the bending region and the first non-bending region, and/or sequentially distributed in a direction parallel to a connecting line of the bending region and the second non-bending region.
7. The display panel of claim 1, further comprising a support plate comprising a first portion and a second portion, wherein the support plate is disposed on the second surface of the flexible substrate, and wherein the first portion is disposed in the first non-bending region and the second portion is disposed in the second non-bending region.
8. The display panel according to claim 7, wherein the display panel further comprises a bending support body, the bending support body comprises a fixing connection portion and a bending support portion that are connected with each other, and the fixing connection portion is sandwiched between the first non-bending region and the second non-bending region; the bending support part is adjacent to the bending area, and one side of the bending support part, which faces the bending area, is an arc surface.
9. The display panel according to claim 8, wherein the first non-bending region comprises a display region, and a side of the first portion of the support plate facing away from the flexible substrate is provided with a heat dissipation layer located in the display region;
the fixed connection part of the bent support body comprises a first surface and a second surface which are mutually deviated, the first surface of the fixed connection part is fixedly bonded with the heat dissipation layer, and the second surface of the fixed connection part is fixedly bonded with the second part of the support plate.
10. The display panel of claim 9, wherein the heat dissipation layer comprises a foam layer, a graphite layer, and a copper foil layer;
the first surface of the fixed connecting portion and the second surface of the fixed connecting portion are respectively provided with a first adhesive layer and a second adhesive layer, the first adhesive layer is bonded and fixed to the fixed connecting portion and the heat dissipation layer, and the second adhesive layer is bonded and fixed to the fixed connecting portion and the second portion of the supporting plate.
11. The display panel according to claim 1, wherein the first protective layer and the second protective layer comprise a UV curable glue.
12. The display panel according to claim 1, wherein the first protective layer has a thickness ranging from 30 to 150 μm, and the second protective layer has a thickness ranging from 30 to 150 μm.
13. A display device comprising the display panel according to any one of claims 1 to 12.
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