Display panel and display device

Abstract

The application relates to a display panel and a display device, the display panel comprising a bending area and flat areas located on opposite sides of the bending area along a first direction, the bending area comprising a first bending area and a second bending area located on opposite sides of the first bending area along the first direction, the display panel comprising: a screen body having a light-emitting side and a backlight side oppositely arranged along a thickness direction of the screen body, the first direction intersecting the thickness direction; a barrier layer arranged close to the backlight side; a support layer arranged on a side of the barrier layer away from the screen body, the support layer having a bending hole penetrating along the thickness direction, the bending hole being arranged in the first bending area; wherein along the thickness direction, the orthographic projection of the barrier layer covers the orthographic projection of the first bending area and the orthographic projection of the bending hole; the barrier layer is provided with a stress release part, and the stress release part can reduce the bending stress transmitted from the first bending area to the second bending area. The display panel provided by the application can prolong the bending life of the display panel.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display panel and display device. Background Technology

[0002] Among existing display panels, flexible display panels are gradually becoming one of the mainstream development directions in the display field due to their advantages such as bendability, ease of storage, and high portability. To enable repeated bending, the panel's laminated structure typically includes a support layer made of metal materials such as stainless steel to provide structural rigidity. This support layer usually has bending holes penetrating its thickness at the bending area to release stress. In existing partially foldable display panels, a new barrier layer has been introduced to improve the dustproof effect of the aforementioned bending holes. However, this barrier layer itself has a certain rigidity. Adding this barrier layer makes the display panel prone to stress concentration in the bending area, leading to film cracking or peeling in the bending area, reducing the bending life and reliability of the display panel.

[0003] Therefore, there is an urgent need for a display panel that can extend its bending life, as well as a corresponding display device. Summary of the Invention

[0004] In a first aspect, according to an embodiment of this application, a display panel is provided, including a bending area and flat areas located on opposite sides of the bending area along a first direction. The bending area includes a first bending area and second bending areas located on opposite sides of the first bending area along the first direction. The display panel includes: a screen body having a light-emitting side and a backlight side disposed opposite to each other along its own thickness direction, the first direction intersecting the thickness direction; a barrier layer disposed near the backlight side; and a support layer disposed on the side of the barrier layer away from the screen body. The support layer has a bending hole penetrating along the thickness direction, the bending hole being disposed in the first bending area. Along the thickness direction, the orthographic projection of the barrier layer covers both the orthographic projection of the first bending area and the orthographic projection of the bending hole. The barrier layer is provided with a stress-relieving portion, which can reduce the bending stress transmitted from the first bending area to the second bending area.

[0005] According to one aspect of the embodiments of this application, a stress relief portion is disposed in the first bending region, and the stress relief portion is recessed from the surface of the barrier layer in the thickness direction into the interior of the barrier layer along the thickness direction.

[0006] According to one aspect of the embodiments of this application, the stress relief portion includes a stress relief groove recessed along the thickness direction, wherein the recess depth of the stress relief groove is less than the thickness of the barrier layer.

[0007] According to one aspect of the embodiments of this application, the stress relief part includes a plurality of stress relief grooves, which are spaced apart along a first direction and extend along a second direction. The first direction, the second direction, and the thickness direction are intersected in pairs. Along the second direction, the extension dimension of the stress relief groove is smaller than the extension dimension of the barrier layer, and one end of the stress relief groove is connected to the edge of the barrier layer.

[0008] According to one aspect of the embodiments of this application, along the first direction, the width dimension of the stress relief groove is 0.1mm~0.2mm; along the second direction, the difference between the extension dimension of the barrier layer and the extension dimension of the stress relief groove is 0.3mm~0.7mm.

[0009] According to one aspect of the embodiments of this application, a plurality of stress relief grooves are arranged in an array along a first direction and a second direction, and the first direction, the second direction and the thickness direction are arranged in pairs; in the first direction and the second direction, the plurality of stress relief grooves are arranged at equal intervals, and the stress relief grooves are spaced apart from the edges of the barrier layer.

[0010] According to one aspect of the embodiments of this application, a plurality of stress relief grooves include a first groove and a second groove with openings located on opposite sides of the barrier layer along the thickness direction, the first groove and the second groove being spaced apart along the thickness direction.

[0011] According to one aspect of the embodiments of this application, along the thickness direction, the orthographic projection of the first groove and the orthographic projection of the second groove at least partially overlap, and the ratio of the sum of the recess depth of the first groove and the recess depth of the second groove to the thickness of the barrier layer is 0.4 to 0.6.

[0012] According to one aspect of the embodiments of this application, the stress relief portion further includes a connecting hole and a filling portion, the connecting hole extending along the thickness direction and connecting between the first groove and the second groove; the stiffness of the filling portion is less than the stiffness of the barrier layer, and the filling portion fills the first groove, the second groove and the connecting hole.

[0013] According to one aspect of the embodiments of this application, the orthographic projection of the connecting hole and the orthographic projection of the bent hole are staggered along the thickness direction.

[0014] According to one aspect of the embodiments of this application, a stress relief portion is disposed in the second bending area and / or flat area. The stress relief portion is recessed along the thickness direction and penetrates the barrier layer. Along the second direction, the maximum size of the stress relief portion is the same as the size of the barrier layer. The first direction, the second direction and the thickness direction are intersected in pairs.

[0015] According to one aspect of the embodiments of this application, the stress relief portion includes a clearance portion disposed in the second bending region and the flat region; along the thickness direction, the orthographic projection of the barrier layer is staggered from the orthographic projection of the second bending region and the orthographic projection of the flat region.

[0016] According to one aspect of the embodiments of this application, the display panel further includes a flattening layer disposed in the relief portion, the stiffness of the flattening layer being less than the stiffness of the barrier layer.

[0017] According to one aspect of the embodiments of this application, the stress relief portion includes a partition groove, and the barrier layer includes a first barrier portion and a second barrier portion located on opposite sides of the first direction along the first direction. The first barrier portion is disposed in a first bending area, and the second barrier portion is disposed in a second bending area and / or a flat area. The partition groove is disposed between the first barrier portion and the second barrier portion so that the first barrier portion and the second barrier portion are spaced apart along the first direction.

[0018] Secondly, according to embodiments of this application, a display device is provided, including the display panel in any embodiment of the first aspect.

[0019] The display panel provided in this embodiment has a bending area and a flat area. The display panel includes a screen body, a barrier layer, and a support layer arranged along the thickness direction. The support layer provides support and protection for the screen body during bending, and bending holes are provided in the bending area to reduce bending stress. The barrier layer is located at the bending holes to prevent external dust and impurities from entering the back of the screen body through the bending holes. Furthermore, the barrier layer has a stress-relieving section, which reduces the bending stress transmitted from the inner bending area to the outer bending area, preventing cracking or bending of the outer bending area due to the structural strength of the barrier layer itself, thereby extending the bending life of the display panel. Attached Figure Description

[0020] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the structure of a display panel provided in one embodiment of this application; Figure 2 This is a partial structural schematic diagram of the barrier layer provided in one embodiment of this application; Figure 3 yes Figure 2 Sectional view at point A-A'; Figure 4 This is a partial structural schematic diagram of the barrier layer provided in another embodiment of this application; Figure 5 yes Figure 4 Sectional view at point B-B'; Figure 6 This is a partial structural schematic diagram of the barrier layer provided in another embodiment of this application; Figure 7 yes Figure 6 Sectional view at C-C'; Figure 8 This is a schematic diagram of the structure of a display panel provided in another embodiment of this application; Figure 9 This is a schematic diagram of the structure of a display panel provided in another embodiment of this application; Figure 10 This is a schematic diagram of the structure of a display device provided in one embodiment of this application.

[0022] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale.

[0023] 100 - Display panel; 200 - Display device; 101 - Bending area; 102 - Flat area; 103 - First bending area; 104 - Second bending area; 10 - Screen body; 20 - Barrier layer; 30 - Support layer; 40 - Planarization layer; 11-Light-emitting side; 12-Backlight side; 21-Stress relief section; 22-First barrier section; 23-Second barrier section; 31-Bending hole; 211-Stress relief groove; 212-First groove; 213-Second groove; 214-Connecting hole; 215-Filling part; 216-Relief part; 217-Partition groove; X - First direction; Y - Second direction; Z - Thickness direction. Detailed Implementation

[0024] The features and exemplary embodiments of various aspects of this application will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a comprehensive understanding of this application. However, it will be apparent to those skilled in the art that this application can be implemented without some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this application by illustrating examples. In the accompanying drawings and the following description, at least some well-known structures and techniques are not shown to avoid unnecessarily obscuring the application; and, for clarity, the dimensions of some structures may be exaggerated. Furthermore, the features, structures, or characteristics described below can be combined in any suitable manner in one or more embodiments.

[0025] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the molding die and molding method of this application. It should also be noted that, unless otherwise explicitly specified and limited, "multiple" means two or more, and the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. The terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art will understand the specific meaning of these terms in this application based on the specific circumstances.

[0027] With the development of display technology, flexible display panels have gradually become one of the mainstream development directions in the display field due to their advantages such as bendability, easy storage, and high portability. In bendable display devices, the display panel is usually divided into a flat area and a bending area located between the flat areas. In order to achieve repeated bending, the panel stack structure usually has a support layer made of metal materials such as stainless steel to provide structural rigidity. At the same time, in order to release the huge stress generated in the bending area during the bending process, the support layer usually has bending holes that penetrate its thickness at the position corresponding to the bending area, thereby forming a weak area similar to a hinge to facilitate deformation.

[0028] Building upon this, to enhance drop resistance and dust protection at the bending holes, some related technologies typically incorporate a barrier layer on the backlight side of the display panel. This barrier layer covers the bending hole area of ​​the support layer to prevent external dust from entering the screen through the bending holes and causing display abnormalities, while also providing cushioning and support in the event of external impacts.

[0029] However, regarding the aforementioned foldable display panel structure, the applicant discovered that in practical applications, the display panel often exhibits a teardrop-shaped bend in the bending area, consisting of an inner bending region in the center and outer bending regions on either side of the inner bending region. While introducing a barrier layer can solve dustproofing and impact resistance issues, it easily leads to increased bending stress. During bending, the continuous barrier layer directly transfers and superimposes the inner bending stress in the center onto the outer bending regions on both sides. Because the screen in the outer bending region is subjected to tensile stress, it is more sensitive to stress. This stress transfer causes the bending stress in the outer bending region to increase, easily exceeding the safety threshold of the screen material. Consequently, the outer bending region may crack or peel off after a relatively low number of bends, significantly affecting the bending life of the display panel.

[0030] To address the aforementioned issues, this application provides a display panel and display device, wherein the stress transmitted from the inner bending region to the outer bending region in the barrier layer is reduced by a stress relief portion, thereby improving the overall bending life of the display panel while maintaining good dustproof performance.

[0031] It is understood that the following embodiments of this application are only used as an example of applying the aforementioned support stacked structure to a display panel. However, the support structure and display panel provided in the embodiments of this application are not limited to the following embodiments. They can also be used in other occasions where bending stress needs to be released and protected.

[0032] To better understand this application, the following will be combined with... Figures 1 to 10 Provide a detailed description.

[0033] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a display panel provided in one embodiment of this application.

[0034] In a first aspect, according to embodiments of this application, a display panel 100 is provided, including a bending region 101 and flat regions 102 located on opposite sides of the bending region 101 along a first direction X. The bending region 101 includes a first bending region 103 and second bending regions 104 located on opposite sides of the first bending region 103 along the first direction X. The display panel 100 includes: a screen body 10 having a light-emitting side 11 and a backlight side 12 disposed opposite to each other along its own thickness direction Z, wherein the first direction X intersects the thickness direction Z; and a barrier layer 20. A support layer 30 is disposed near the backlight side 12, on the side of the barrier layer 20 away from the screen body 10. The support layer 30 has a bending hole 31 that runs through the thickness direction Z and is disposed in the first bending area 103. The orthographic projection of the barrier layer 20 along the thickness direction Z covers both the orthographic projection of the first bending area 103 and the orthographic projection of the bending hole 31. The barrier layer 20 is provided with a stress relief part 21, which can reduce the bending stress transmitted from the first bending area 103 to the second bending area 104.

[0035] The first aspect of this application provides a display panel 100, which includes a bending region 101 and flat regions 102 located on opposite sides of the bending region 101 along a first direction X. The bending region 101 further includes a first bending region 103 and second bending regions 104 located on opposite sides of the first bending region 103 along the first direction X, that is, the two second bending regions 104 are respectively disposed between the first bending region 103 and the two flat regions 102.

[0036] It is understood that the display panel 100 in this embodiment can have a teardrop shape when folded. In this case, the first bending area 103 can be in an inward bending state, and the second bending area 104 can be in an outward bending state. Here, the inward bending state refers to protruding in a direction away from the bending axis, and the outward bending state refers to protruding in a direction closer to the bending axis.

[0037] The display panel 100 includes a screen body 10, a barrier layer 20, and a support layer 30 arranged along its own thickness direction Z. The three can be directly stacked or spaced apart. The aforementioned first direction X intersects with the thickness direction Z of the screen body 10. The first direction X is the extension direction of the display panel 100 in its non-bent state, that is, the direction to be bent, and can be further selected as the length direction of the display panel 100.

[0038] The screen 10 has a light-emitting side 11 and a backlight side 12 arranged opposite each other along its thickness direction Z. Light for displaying images is emitted from the light-emitting side 11. A barrier layer 20 is disposed near the backlight side 12 of the screen 10, and a support layer 30 is disposed on the side of the barrier layer 20 away from the screen 10. A bending hole 31 is provided on the support layer 30, extending along the thickness direction Z. The bending hole 31 is located in the first bending area 103 to provide deformation space for bending. The barrier layer 20 is disposed in the area corresponding to the location of the bending hole 31.

[0039] Specifically, the support layer 30 may have bending holes 31 only in the first bending region 103, or the support layer 30 may also have bending holes 31 in the second bending region 104. The bending holes 31 may be multiple strip holes arranged along the first direction X, or the bending holes 31 may be multiple columnar holes distributed in an array. This application does not make any specific limitation in this regard.

[0040] In the thickness direction Z, the orthographic projection of the barrier layer 20 covers both the orthographic projection of the first bending region 103 and the orthographic projection of the bending hole 31. This allows the barrier layer 20 to extend continuously within the first bending region 103, effectively preventing dust from entering the display panel 100 through the bending hole 31 and avoiding dust accumulation on the back of the screen 10 that could degrade the display effect. Simultaneously, the barrier layer 20 can disperse the impact force from the edge of the bending hole 31 of the support layer 30 on the screen 10 when the display panel 100 is dropped, thus providing protection and support for the screen 10 together with the support layer 30.

[0041] Optionally, the support layer 30, the barrier layer 20, and the screen 10 can be bonded together in sequence. The support layer 30 and the barrier layer 20 can both include a layer structure made of metal, such as stainless steel.

[0042] Based on this, the barrier layer 20 in this embodiment is provided with a stress relief section 21, which can reduce the bending stress transmitted from the first bending region 103 to the second bending region 104 of the barrier layer 20. Specifically, the stress relief section 21 can reduce the transmitted bending stress in a variety of different ways, such as: similar to the support layer 30, by removing part of the barrier layer 20 material to reduce the generated bending stress, or by setting the barrier section as multiple spaced sub-sections to cut off the stress transmission path, etc.

[0043] Therefore, when the display panel 100 is bent, the screen 10, support layer 30 and barrier layer 20 of the first bending area 103 deform and generate large bending stress. At this time, by providing stress relief part 21 on the barrier layer 20, the stress transmission path can be changed or the stiffness of the transmission medium can be reduced, thereby effectively reducing the bending stress transmitted from the first bending area 103 to the second bending area 104 through the barrier layer 20 under bending conditions.

[0044] In summary, by providing the stress relief section 21, the display panel 100 can effectively reduce or eliminate the adverse stress transmission from the inner bending area to the outer bending area while maintaining the dustproof protection and impact resistance reinforcement functions of the barrier layer 20 for the bending hole 31 area. This reduces the peak value of the composite bending stress borne by the screen body 10 in the second bending area 104 and the connection structure between the screen body 10 and the barrier layer 20 and support layer 30, thereby improving the overall structural reliability and bending life of the display panel 100 under repeated bending conditions.

[0045] Please refer to the following: Figure 2 and Figure 3 , Figure 2 This is a partial structural diagram of the barrier layer provided in one embodiment of this application. Figure 3 yes Figure 2 Sectional view at point A-A'.

[0046] In some alternative embodiments, the stress relief portion 21 is disposed in the first bending region 103, and the stress relief portion 21 is recessed into the barrier layer 20 from the surface of the barrier layer 20 in the thickness direction Z along the thickness direction Z.

[0047] Optionally, the stress relief portion 21 in the barrier layer 20 can be disposed in the first bending region 103. Specifically, it can be a groove or through-hole structure formed by the depression. By locally thinning the barrier layer 20, the stiffness of the layer structure in the first bending region 103 is reduced, so that the first bending region 103 absorbs more strain energy when it deforms, and reduces the stress component transmitted outward.

[0048] Specifically, the stress relief portion 21 is recessed on at least one surface in the thickness direction Z. The recess depth can be less than the thickness of the barrier layer 20 to form a groove, or the recess depth can be equal to the thickness of the barrier layer 20 to form a partition or through hole. The barrier layer 20 can be recessed inward from the surface of the barrier layer 20 facing the screen 10, or from the surface facing the support layer 30, or both surfaces can be recessed inward.

[0049] Optionally, during the processing, the stress relief portion 21 of the recess can be formed using processes such as laser engraving, mold imprinting, or photolithography. The specific shape of the recess can be strip-shaped, circular, or grid-shaped, etc., and this application does not impose any specific limitations on it.

[0050] By setting the stress relief section 21 to be recessed along the thickness direction Z, the bending stress can be absorbed by the thinner and more flexible structure in the first bending region 103, effectively reducing the stress transmission to the second bending region 104, and facilitating processing.

[0051] In some optional embodiments, the stress relief portion 21 includes a stress relief groove 211 recessed along the thickness direction Z, the recess depth of the stress relief groove 211 being less than the thickness of the barrier layer 20.

[0052] Optionally, in the embodiment where the stress relief portion 21 is recessed, the stress relief portion 21 can be further made into the form of a groove, wherein the recess depth of the stress relief groove 211 is less than the thickness of the barrier layer 20, that is, the barrier layer 20 maintains a continuously extending structure and is only locally thinned.

[0053] Optionally, the stress relief section 21 may include a plurality of stress relief grooves 211. The depth, shape and size of these stress relief grooves 211 may be the same or different. The openings of the plurality of stress relief grooves 211 may all be provided on the same side surface of the barrier layer 20, or the openings of the plurality of stress relief grooves 211 may be provided on opposite sides of the barrier layer 20 in the thickness direction Z.

[0054] For example, in order to facilitate bending, the stress relief groove 211 can be extended along the second direction Y and distributed along the first direction X, with the first direction X, the second direction Y and the thickness direction Z intersecting each other, or further optionally, they can be perpendicular to each other.

[0055] It is understandable that, in addition to setting the opening on the stress relief groove 211 on one side of the thickness direction Z of the barrier layer 20, a hollow cavity can also be used for thinning. This structure and tooling are somewhat difficult, but it can make both sides of the barrier layer 20 a complete surface, thereby improving the protective performance of the barrier layer 20.

[0056] Optionally, the opening of the stress relief groove 211 can be set on the side of the barrier layer 20 facing the support layer 30. Through simulation test, it can be seen that the stress relief groove 211 set on this side of the barrier layer 20 can better reduce the stress and strain of the screen body 10 and the adhesive layer between the screen body 10 and the barrier layer 20 at the second bending area 104.

[0057] By adopting the aforementioned non-penetrating stress relief groove 211 design, the continuity of the barrier layer 20 in the thickness direction Z and a certain structural strength can be maintained while reducing stress transmission, reducing the possibility of generating new fracture potential points and making it easier to resist external impacts; at the same time, the groove structure can provide stress guidance, so that the bending stress is concentrated at a thinner position and released.

[0058] In some optional embodiments, the stress relief part 21 includes a plurality of stress relief grooves 211, which are spaced apart along a first direction X and extend along a second direction Y. The first direction X, the second direction Y and the thickness direction Z are intersected in pairs. Along the second direction Y, the extension dimension of the stress relief groove 211 is smaller than the extension dimension of the barrier layer 20, and one end of the stress relief groove 211 is connected to the edge of the barrier layer 20.

[0059] Optionally, in embodiments where the stress relief portion 21 includes a plurality of stress relief grooves 211 recessed along the thickness direction Z, these stress relief grooves 211 may extend along the second direction Y and be arranged at intervals along the first direction X, optionally in an equally spaced arrangement. Wherein, in the folded state, the first direction X may be the length direction of the display panel 100, and the second direction Y may be the width direction of the display panel 100.

[0060] Meanwhile, along the second direction Y, the extension dimension of the stress relief groove 211 is smaller than the extension dimension of the barrier layer 20, that is, the length of the stress relief groove 211 is smaller than the width of the barrier layer 20. The stress relief groove 211 maintains a structural form that occupies a portion of the width direction of the barrier layer 20, and does not form a groove that crosses the barrier layer 20 and extends continuously along the second direction Y. This can improve the structural strength at the edge of the barrier layer 20 and avoid areas or points where the barrier layer 20 is too weak due to thinning.

[0061] Based on this, one end of the stress relief groove 211 can be connected to the edge of the barrier layer 20. That is, one end of the stress relief groove 211 extends to one edge of the barrier layer 20, and the other end is spaced apart from the other edge of the barrier layer 20. Multiple stress relief grooves 211 adopt this structure, which can form a "comb-like" or "finger-like" grooving pattern. Specifically, each stress relief groove 211 arranged along the first direction X can extend to the same edge of the barrier layer 20 to form a comb-like grooving, making it easier to process; or, along the first direction X, adjacent stress relief grooves 211 can extend to the opposite two edges of the barrier layer 20 to form a left-right intersecting grooving structure, making the structural strength of the barrier layer 20 more uniform.

[0062] By setting multiple stress relief grooves 211 and extending them to the edge of the barrier layer 20, the bending deformation of the first bending area 103 as a whole can be decomposed into the independent deformation of multiple small units, thereby releasing the lateral contraction constraint along the first direction X and reducing the additional stress generated during bending.

[0063] In some optional embodiments, the width of the stress relief groove 211 along the first direction X is 0.1 mm to 0.2 mm; and the difference between the extension dimension of the barrier layer 20 and the extension dimension of the stress relief groove 211 along the second direction Y is 0.3 mm to 0.7 mm.

[0064] Optionally, in an embodiment where the stress relief section 21 is configured as a plurality of stress relief grooves 211, the width of the stress relief groove 211 along the first direction X can be 0.1mm to 0.2mm, for example, it can be any one of 0.1mm, 0.13mm, 0.16mm, 0.19mm, 0.2mm or between any two of them.

[0065] By setting the width of the stress relief groove 211 within the aforementioned range, the overall rigidity of the groove area can be reduced sufficiently, while the dustproofing will not fail or the support for the screen body 10 will not be insufficient due to the excessive width of the groove.

[0066] Furthermore, the second direction Y extending along the stress relief groove 211 has a length less than the width of the barrier layer 20, and the difference between the two can be 0.3mm to 0.7mm, for example, it can be any one of 0.3mm, 0.5mm, 0.7mm or any two of them.

[0067] By limiting the difference between the width of the barrier layer 20 and the length of the stress relief groove 211 to the aforementioned range, a continuous border can be maintained at the opposite edges of the barrier layer 20 along the second direction Y, thereby ensuring the sealing of the edge of the barrier layer 20 and giving the edge of the barrier layer 20 high impact resistance.

[0068] Please refer to the following: Figure 4 and Figure 5 , Figure 4 This is a partial structural diagram of the barrier layer provided in another embodiment of this application. Figure 5 yes Figure 4 Sectional view at point B-B'.

[0069] In some optional embodiments, a plurality of stress relief grooves 211 are arranged in an array along a first direction X and a second direction Y, with the first direction X, the second direction Y and the thickness direction Z intersecting each other; the plurality of stress relief grooves 211 are arranged at equal intervals along the first direction X and the second direction Y, and the stress relief grooves 211 are spaced apart from the edge of the barrier layer 20.

[0070] Optionally, in parallel with the aforementioned strip-shaped slots extending along the second direction Y, the stress relief groove 211 can also be configured as a plurality of independent grooves with relatively small lengths that are independent of each other and spaced apart from each other. These grooves can be distributed in an array along the first direction X and the second direction Y.

[0071] Optionally, the shape and size of each stress relief groove 211 can be the same to facilitate the processing of the barrier layer 20 and ensure uniform strength throughout. The stress relief groove 211 can be circular, elliptical, rhomboid, rectangular, or other polygonal shapes, etc., and this application does not impose any specific limitations on it. Each stress relief groove 211 can be a block-shaped groove that extends continuously and spreads out in the plane of the barrier layer 20, or the stress relief groove 211 can be annular.

[0072] These independent stress relief grooves 211 can be evenly spaced along the first direction X and the second direction Y, and each maintains a certain distance from the edge of the barrier layer 20 so that the edge of the barrier layer 20 extends continuously and completely. Optionally, the stress relief grooves 211 can be integrally formed by an imprinting process or made by a photomask etching method.

[0073] By setting up multiple stress relief grooves 211 arranged in an equally spaced array, it is possible to uniformly control the stiffness of the barrier layer 20 at various points, reduce the possibility of local stress concentration caused by anisotropy, and provide a better dustproof effect.

[0074] In some optional embodiments, the plurality of stress relief grooves 211 include a first groove 212 and a second groove 213 with openings located on opposite sides of the barrier layer 20 along the thickness direction Z, the first groove 212 and the second groove 213 being spaced apart along the thickness direction Z.

[0075] Optionally, in an embodiment where the stress relief section 21 is a plurality of stress relief grooves 211, the plurality of stress relief grooves 211 may be respectively recessed on opposite sides of the barrier layer 20, and the stress relief grooves 211 respectively provided on both sides should be spaced apart to avoid interconnection.

[0076] Specifically, the stress relief groove 211 may include a first groove 212 and a second groove 213 with openings located on opposite sides of the barrier layer 20 in the thickness direction Z. The shape, size, depth of recess and arrangement of the first groove 212 and the second groove 213 may be the same or different.

[0077] Optionally, along the thickness direction Z of the barrier layer 20, the first groove 212 and the second groove 213 can be staggered, meaning their orthographic projections along this direction are offset from each other. In this case, the depths of both the first groove 212 and the second groove 213 are less than the thickness of the barrier layer 20, and the sum of their thicknesses can be greater than the thickness of the barrier layer 20. Alternatively, along the thickness direction Z of the barrier layer 20, the orthographic projections of the first groove 212 and the second groove 213 can at least partially overlap. In this case, the sum of their thicknesses should be less than the thickness of the barrier layer 20, so that an unremoved solid portion is retained in the middle of the barrier layer 20.

[0078] By simultaneously providing stress relief grooves 211 on both sides of the barrier layer 20, the neutral layer can be kept at the center position in the thickness direction Z of the barrier layer 20 during bending, and the equivalent bending stiffness can be further reduced. Compared with the above-described single-sided slotted embodiment, the double-sided slotted structure can further reduce the stress and strain generated in the adhesive layer and the screen 10 in the second bending region 104.

[0079] In some alternative embodiments, along the thickness direction Z, the orthographic projection of the first groove 212 and the orthographic projection of the second groove 213 at least partially overlap, and the ratio of the sum of the recess depth of the first groove 212 and the recess depth of the second groove 213 to the thickness of the barrier layer 20 is 0.4 to 0.6.

[0080] In an embodiment where a first groove 212 and a second groove 213 are recessed on both sides of the barrier layer 20, the orthogonal projections of the two along the thickness direction Z can be set to at least partially overlap each other, and can be further selected to be completely opposite to each other along the thickness direction Z.

[0081] In the region where the first groove 212 and the second groove 213 overlap by their Z-direction projection along the thickness direction, the ratio of the sum of their recess depths to the thickness of the barrier layer 20 can be set to 0.4 to 0.6, for example, any one of 0.4, 0.5, or 0.6, or somewhere in between. That is, the total depth of the grooves on both sides is about half the thickness, and the ratio between the thickness of the barrier layer 20 retained between the two grooves and the overall thickness of the barrier layer 20 is also 0.4 to 0.6.

[0082] By limiting the thickness ratio of the first groove 212 and the second groove 213 to the aforementioned range, a good balance can be achieved between bending stiffness and support strength in the area where the barrier layer 20 has openings, thereby reducing stress concentration and ensuring good overall reliability of the display panel 100.

[0083] Please refer to the following: Figure 6 and Figure 7 , Figure 6This is a partial structural schematic diagram of the barrier layer provided in another embodiment of this application. Figure 7 yes Figure 6 Sectional view at C-C'.

[0084] In some optional embodiments, the stress relief portion 21 further includes a connecting hole 214 and a filling portion 215. The connecting hole 214 extends along the thickness direction Z and connects between the first groove 212 and the second groove 213. The stiffness of the filling portion 215 is less than the stiffness of the barrier layer 20, and the filling portion 215 fills the first groove 212, the second groove 213 and the connecting hole 214.

[0085] Optionally, in addition to the first groove 212 and the second groove 213, the stress relief part 21 may further include a connecting hole 214 and a filling part 215, wherein the connecting hole 214 extends along the thickness direction Z and connects between the first groove 212 and the second groove 213 correspondingly provided in this direction. The cross-sectional shape formed by the connecting hole 214 in a cross section perpendicular to its own axis can be circular, elliptical, racetrack-shaped, rectangular, or other polygonal shapes.

[0086] Based on this, the aforementioned first groove 212, second groove 213, and the connecting hole 214 between them can all be filled with flexible filling portions 215. These filling portions 215 can be flexible materials commonly used in display panels 100, such as PI (polyimide), silicone, or optical adhesive, and can be further selected as PI. The filling portions 215 can be sprayed or otherwise introduced into the aforementioned grooves and holes, thus completely filling them.

[0087] In the thickness direction Z, the two side surfaces of the filling portion 215 can be flush with the side surface of the barrier layer 20, so that the filling portion 215 and the barrier layer 20 together form a structure with relatively flat side surfaces. Based on the fact that the area of ​​the first groove 212 and the second groove 213 is greater than or equal to the area of ​​the connecting hole 214, the filling portion 215 filled therein can form an anchoring structure penetrating both sides of the barrier layer 20, ensuring stable connection with the barrier layer 20 during repeated bending.

[0088] The stiffness of the filling part 215 is less than that of the barrier layer 20. When the display panel 100 is bent, the filling part 215 can deform accordingly with the bending of the barrier layer 20, so as to consume energy through its own deformation while avoiding obstructing the bending of the barrier layer 20.

[0089] By introducing a lower-stiffness filling portion 215 into the first groove 212, the second groove 213, and the connecting hole 214, the two grooves can be filled in the unfolded state, providing a flat support surface for the screen 10 and reducing the possibility of indentations on the screen 10 at the groove edges. Simultaneously, the filling portion 215, acting as a flexible medium connecting the two grooves, can undergo significant shear deformation to dissipate energy, while the solid portion of the barrier layer 20, which is in the same layer as the connecting hole 214, provides the required tensile strength. This structure achieves a good balance between stress relief and structural strength, improving the overall reliability and practicality of the display panel 100.

[0090] In some alternative embodiments, the orthographic projection of the connecting hole 214 is offset from the orthographic projection of the bent hole 31 along the thickness direction Z.

[0091] In the embodiment where the first groove 212 and the second groove 213 are interconnected through a connecting hole 214, the connecting hole 214 and the bending hole 31 in the support layer 30 can be staggered. Specifically, along the thickness direction Z, the orthographic projection of each connecting hole 214 can be staggered from the orthographic projection of each bending hole 31, and the orthographic projections of the first groove 212, the second groove 213 and the bending hole 31 can overlap or be staggered.

[0092] In this embodiment, the bending hole 31 is disposed in the first bending area 103 of the support layer 30 and is used to reduce bending stress. The connecting hole 214 is disposed between the first groove 212 and the second groove 213 of the barrier layer 20. By staggering the two and avoiding the holes in the upper and lower layers being directly opposite each other, it is possible to avoid the formation of a path that is not blocked by a rigid structure and directly connects to the back side of the screen 10 from the outside on the backlight side 12 of the screen 10. This avoids the adverse effects of external dust, impurities or moisture on the screen 10 and improves the reliability of the display panel 100.

[0093] In some optional embodiments, the stress relief portion 21 is disposed in the second bending region 104 and / or the flat region 102. The stress relief portion 21 is recessed along the thickness direction Z and is disposed through the barrier layer 20. Along the second direction Y, the maximum size of the stress relief portion 21 is the same as the size of the barrier layer 20. The first direction X, the second direction Y and the thickness direction Z are intersected in pairs.

[0094] Optionally, the stress relief portion 21 may also be provided in the second bending region 104 and / or the flat region 102, and in this case, the stress relief portion 21 penetrates and blocks the barrier layer 20 along the thickness direction Z. In this embodiment, the stress relief portion 21 is recessed along the thickness direction Z, and its recess depth is the same as the thickness of the barrier layer 20, forming a through hole or through groove to prevent the force transmitted from the first bending region 103 to the second bending region 104 or to remove part of the barrier layer 20 in the second bending region 104 and the flat region 102.

[0095] Specifically, in embodiments where the stress relief portion 21 is disposed in the second bending region 104 and / or the flat region 102, the extension dimension of the stress relief portion 21 in the second direction Y can be the same as the extension dimension of the barrier layer 20 in that direction. That is, the stress relief portion 21 can divide the barrier layer 20 into multiple parts, or the stress relief portion 21 can completely remove the barrier layer 20 in a portion of the region. In this case, the barrier layer 20 can extend continuously and completely only in the first bending region 103, or further, the barrier layer 20 can maintain a minimum area in which its orthographic projection along the thickness direction Z can cover the orthographic projection of the bending hole 31.

[0096] By adopting the aforementioned stress relief section 21 structure, the barrier layer 20 can be partitioned or partially removed to block the path of bending stress from the first bending area 103 to the second bending area 104 or to directly remove the barrier layer 20 that generates bending stress in the second bending area 104 or even the flat area 102. This can effectively reduce the bending stress at the screen body 10 and the welding layer in the second bending area 104.

[0097] It is understood that the barrier layer 20 may have stress relief portions 21 in both the first bending region 103 and the second bending region 104. The stress relief portion 21 in the first bending region 103 may adopt the structural form of the above embodiments, while the stress relief portion 21 in the second bending region 104 is provided to penetrate the barrier layer 20 along the thickness direction Z.

[0098] Please see Figure 8 , Figure 8 This is a schematic diagram of the structure of a display panel provided in another embodiment of this application.

[0099] In some optional embodiments, the stress relief portion 21 includes a clearance portion 216 disposed in the second bending region 104 and the flat region 102; along the thickness direction Z, the orthographic projection of the barrier layer 20 is offset from the orthographic projection of the second bending region 104 and the orthographic projection of the flat region 102.

[0100] Specifically, the stress relief section 21 may include a relief section 216 that is disposed in both the second bending region 104 and the flat region 102 and is disposed through the thickness direction Z. The relief section 216 is capable of removing at least a portion of the barrier layer 20.

[0101] Based on this, by adjusting the size and position of the clearance portion 216 in the first direction X, the portion of the barrier layer 20 located in the second bending region 104 and the flat region 102 can be completely removed, leaving only the portion of the structure located in the first bending region 103. At this time, along the thickness direction Z, the orthographic projection of the barrier layer 20 can be located in the first bending region 103, while being offset from both the second bending region 104 and the flat region 102.

[0102] It is understood that in this embodiment, the edge of the barrier layer 20 can be exactly flush with the edge of the first bending area 103, or the area of ​​the barrier layer 20 can be smaller than the area of ​​the first bending area 103, as long as the barrier layer 20 can be configured to cover the bending hole 31 in the support layer 30.

[0103] By removing part of the barrier layer 20 located in the second bending region 104 and the flat region 102, the bending stress in the two regions can be effectively reduced in a way that reduces the rigid layer structure, thereby reducing the possibility of the screen 10 cracking or the layer structure peeling in the second bending region 104.

[0104] Please see Figure 9 , Figure 9 This is a schematic diagram of the structure of a display panel provided in another embodiment of this application.

[0105] In some alternative embodiments, the display panel 100 further includes a planarization layer 40 disposed on the relief portion 216, the rigidity of the planarization layer 40 being less than the rigidity of the barrier layer 20.

[0106] Optionally, the barrier layer 20 in this embodiment has a certain thickness. To compensate for the step difference caused by removing part of the barrier layer 20, and to reduce the possibility of air bubbles forming at the step difference during module bonding or stress concentration during drop, a flattening layer 40 can be added to the relief portion 216. The thickness of the flattening layer 40 can be the same as or similar to the thickness of the barrier layer 20, and it has low rigidity, so as to compensate for the aforementioned step difference with a flexible material. While reducing the adverse effects caused by the step difference, it ensures that the bending stress generated is less than the bending stress generated by the barrier layer 20 of the same thickness.

[0107] Based on this, the planarization layer 40 filled in the relief portion 216 can be an organic adhesive layer formed by coating and curing, such as optically transparent adhesive or foamed buffer adhesive, or the planarization layer 40 can be made of a flexible material such as PI.

[0108] Optionally, the area and size of the planarization layer 40 can completely correspond to the relief portion 216, so that the edge of the planarization layer 40 is partially flush with the edge of the screen body 10 and the edge of the barrier layer 20, respectively. This allows the planarization layer 40 to provide more uniform and slight support to all parts of the screen body 10, reducing the possibility of the screen body 10 denting when pressed. Alternatively, the area of ​​the planarization layer 40 can be smaller than the area of ​​the relief portion 216, ensuring that the orthogonal projection of the screen body 10 along the thickness direction Z can cover it.

[0109] It is understood that the barrier layer 20 and the layer structures on both sides in the embodiments of this application may be bonded together. In embodiments where the adhesive material used meets the requirements for the hardness, flowability and other properties of the filling part 215, the adhesive layer on at least one side of the barrier layer 20 may be integrally formed with the filling part 215 to reduce the processing steps of the display panel 100 and improve processing efficiency.

[0110] By filling the clearance portion 216 with a low-stiffness planarization layer 40, the thickness difference problem caused by removing the barrier layer 20 can be solved, improving the flatness of the screen 10. Simultaneously, since the planarization layer 40 itself is relatively flexible, its flexural modulus is much smaller than that of the barrier layer 20; therefore, the introduction of this layer structure hardly increases the bending stress of the second bending region 104. Thus, the planarization layer 40 can solve the thickness difference problem while maintaining low bending stress.

[0111] In some optional embodiments, the stress relief portion 21 includes a partition groove 217, and the barrier layer 20 includes a first barrier portion 22 and a second barrier portion 23 located on opposite sides of the first direction X. The first barrier portion 22 is disposed in the first bending region 103, and the second barrier portion 23 is disposed in the second bending region 104 and / or the flat region 102. The partition groove 217 is disposed between the first barrier portion 22 and the second barrier portion 23 so that the first barrier portion 22 and the second barrier portion 23 are spaced apart along the first direction X.

[0112] Optionally, the stress relief section 21 may further include a partition groove 217, which extends along the second direction Y and divides the barrier layer 20 into a first barrier section 22 and a second barrier section 23, wherein the first barrier section 22 is located in the first bending region 103, and a plurality of second barrier sections 23 are respectively located on opposite sides of the first barrier section 22 in the first direction X.

[0113] In this embodiment, the second blocking portion 23 can be disposed in the second bending region 104 and / or the flat region 102. Exemplarily, the second blocking portion 23 can be disposed only in the second bending region 104 or simultaneously in both the second bending region 104 and the flat region 102. In this case, the partition groove 217 is located at the junction of the first bending region 103 and the second bending region 104, and is used to disconnect the first blocking portion 22 located in the first bending region 103 from the second blocking portion 23 located at least partially in the second bending region 104. This cuts off the path for the first blocking portion 22 to transmit bending stress to the second blocking portion 23, effectively reducing stress concentration in the second bending region 104.

[0114] Alternatively, the second barrier portion 23 can be provided only in the flat region 102. In this case, the barrier layer 20 in the second bending region 104 is completely removed by the partition groove 217. That is, the orthographic projection of the barrier layer 20 along the thickness direction Z is offset from the second bending region 104, and the extension dimension of the partition groove 217 in the first direction X is greater than or equal to the extension dimension of the second bending region 104 in that direction. This allows the barrier layer 20 in the second bending region 104 to be removed, thereby reducing the bending stress generated in that region.

[0115] Optionally, multiple second blocking portions 23 may be simultaneously provided on the same side of the first blocking portion 22 in the first direction X. These second blocking portions 23 may be spaced apart along this direction to further reduce bending stress concentration. For example, two second blocking portions 23 may be provided on the same side of the first blocking portion 22. These two second blocking portions 23 may be provided corresponding to the second bending region 104 and the flat region 102, respectively, and have a certain width of gap at the junction of the two regions, thereby cutting off the paths for transmitting bending stress from both sides of the second bending region 104 into the second bending region 104, further reducing stress concentration.

[0116] By providing a partition groove 217 at the junction of the first bending area 103 and the second bending area 104, the physical medium through which stress is transmitted from the first blocking part 22 to the second blocking part 23 can be cut off. This prevents the internal stress generated by the deformation of the first bending area 103 from being transmitted to the second bending area 104, as it is stopped at the partition groove 217. This mechanical isolation structure has high reliability, and its stress release blocking effect is minimally affected by ambient temperature and the number of bends, thus enabling the display panel 100 to have good stability and reliability.

[0117] Please see Figure 10 , Figure 10 This is a schematic diagram of the structure of a display device provided in one embodiment of this application.

[0118] Secondly, according to embodiments of this application, a display device 200 is provided, including the display panel 100 in any embodiment of the first aspect.

[0119] This application also proposes a display device 200, which can be any product with bending or rolling display requirements, such as a mobile phone, tablet computer, laptop computer, e-reader, or vehicle display terminal.

[0120] The display device 200 provided in this application has all the beneficial effects of the display panel 100 provided in the first aspect. For details, please refer to the specific description of the display panel 100 in the above embodiments. This application will not repeat the details here.

[0121] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A display panel, comprising a bent area and flat areas located on opposite sides of the bent area along a first direction, the bent area comprising a first bent area and second bent areas located on opposite sides of the first bent area along the first direction, characterized in that, The display panel includes: The screen body has a light-emitting side and a backlight side that are arranged opposite to each other along its own thickness direction, wherein the first direction intersects the thickness direction; A barrier layer is disposed near the backlight side; A support layer is disposed on the side of the barrier layer opposite to the screen body. The support layer has a bending hole that extends through the thickness direction and is disposed in the first bending area. Along the thickness direction, the orthographic projection of the barrier layer covers both the orthographic projection of the first bending area and the orthographic projection of the bending hole. The barrier layer is provided with a stress relief section, which can reduce the bending stress transmitted from the first bending area to the second bending area.

2. The display panel according to claim 1, characterized in that, The stress relief portion is disposed in the first bending area, and the stress relief portion is formed by the surface of the barrier layer in the thickness direction being recessed into the barrier layer along the thickness direction.

3. The display panel according to claim 2, characterized in that, The stress relief section includes a stress relief groove recessed along the thickness direction, the recess depth of which is less than the thickness of the barrier layer.

4. The display panel according to claim 3, characterized in that, The stress relief section includes a plurality of stress relief grooves, which are spaced apart along the first direction and extend along the second direction. The first direction, the second direction, and the thickness direction are intersecting each other. Along the second direction, the extension dimension of the stress relief groove is smaller than the extension dimension of the barrier layer, and one end of the stress relief groove is connected to the edge of the barrier layer.

5. The display panel according to claim 4, characterized in that, Along the first direction, the width of the stress relief groove is 0.1mm~0.2mm; Along the second direction, the difference between the extension dimension of the barrier layer and the extension dimension of the stress relief groove is 0.3 mm to 0.7 mm.

6. The display panel according to claim 3, characterized in that, The plurality of stress relief grooves are arranged in an array along the first direction and the second direction, and the first direction, the second direction and the thickness direction are arranged to intersect each other in pairs; In the first direction and the second direction, a plurality of stress relief grooves are arranged at equal intervals, and the stress relief grooves are spaced apart from the edge of the barrier layer.

7. The display panel according to any one of claims 3 to 6, characterized in that, The plurality of stress relief grooves include a first groove and a second groove with openings located on opposite sides of the barrier layer along the thickness direction, the first groove and the second groove being spaced apart along the thickness direction.

8. The display panel according to claim 7, characterized in that, Along the thickness direction, the orthographic projection of the first groove and the orthographic projection of the second groove at least partially overlap, and the ratio of the sum of the recess depth of the first groove and the recess depth of the second groove to the thickness of the barrier layer is 0.4 to 0.

6.

9. The display panel according to claim 8, characterized in that, The stress relief part further includes a connecting hole and a filling part, wherein the connecting hole extends along the thickness direction and connects between the first groove and the second groove; The stiffness of the filling portion is less than that of the barrier layer, and the filling portion fills the first groove, the second groove, and the connecting hole.

10. The display panel according to claim 9, characterized in that, Along the thickness direction, the orthographic projection of the connecting hole is offset from the orthographic projection of the bent hole.

11. The display panel according to claim 1, characterized in that, The stress relief portion is disposed in the second bending area and / or the flat area. The stress relief portion is recessed along the thickness direction and penetrates the barrier layer. Along the second direction, the maximum size of the stress relief portion is the same as the size of the barrier layer. The first direction, the second direction and the thickness direction intersect each other.

12. The display panel according to claim 11, characterized in that, The stress relief section includes a clearance section, which is disposed in the second bending area and the flat area; Along the thickness direction, the orthographic projection of the barrier layer is staggered from the orthographic projection of the second bending region and the orthographic projection of the flat region.

13. The display panel according to claim 12, characterized in that, The display panel further includes a flat layer disposed on the relief portion, the stiffness of the flat layer being less than the stiffness of the barrier layer.

14. The display panel according to claim 11, characterized in that, The stress relief section includes a partition groove, and the barrier layer includes a first barrier section and a second barrier section located on opposite sides of the first direction along the first direction. The first barrier section is disposed in the first bending area, and the second barrier section is disposed in the second bending area and / or the flat area. The partition groove is disposed between the first blocking part and the second blocking part, so that the first blocking part and the second blocking part are spaced apart along the first direction.

15. A display device, characterized in that, Includes the display panel as described in any one of claims 1 to 14.

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