Display module and display device

Abstract

The application provides a display module and a display device. The display module has a bending area and a non-bending area arranged along a first direction. The display module comprises a cover plate, the cover plate comprises a first side and a second side oppositely arranged along a second direction, and the second direction intersects the first direction. The first side of the cover plate is provided with a first groove and a first plane. The first groove comprises a groove bottom surface and a transition surface. The transition surface connects the groove bottom surface and the first plane. The groove bottom surface is at least partially located in the bending area. The transition surface comprises a first boundary connected with the first plane. The first boundary is located in the non-bending area. The display module provided by the application can disperse the stress generated during bending by arranging the first groove on the first side of the cover plate. The first boundary of the transition surface is arranged in the non-bending area, so as to avoid stress concentration on the edge of the transition surface during bending, thereby improving the bending reliability of the display module.

Description

Technical Field

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

[0002] Organic light-emitting diodes (OLEDs) and flat panel displays based on light-emitting diodes (LEDs) are widely used in various consumer electronics products such as mobile phones, televisions, laptops, and desktop computers due to their advantages such as high image quality, energy saving, thin body, and wide range of applications, becoming the mainstream of display devices.

[0003] However, the bending reliability of existing display devices needs to be improved. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a display module and display device that can improve bending reliability.

[0005] To achieve the above objectives, this application provides a display module having bent and non-bent areas arranged along a first direction, the display module comprising:

[0006] A cover plate, the cover plate including a first side and a second side disposed opposite to each other along a second direction, the second direction intersecting the first direction;

[0007] The cover plate has a first groove and a first plane on its first side. The first groove includes a bottom surface and a transition surface, and the transition surface connects the bottom surface and the first plane. The bottom surface is at least partially located in the bending area, and the transition surface includes a first boundary connected to the first plane, which is located in the non-bending area.

[0008] In one embodiment, the transition surface includes a second boundary connected to the bottom surface of the groove, the second boundary being located in the non-bending area;

[0009] Preferably, non-bending areas are provided on both sides of the bending area.

[0010] In one embodiment, the ratio of the first dimension of the transition surface along the first direction to the second dimension of the transition surface along the second direction is greater than 100;

[0011] Preferably, the first direction is perpendicular to the second direction.

[0012] In one embodiment, the shape of the transition surface along a cross section parallel to the first and second directions includes a curved shape;

[0013] Preferably, the transition surface has an S-shaped cross-section parallel to the first and second directions;

[0014] Preferably, along the direction from the bending area to the non-bending area, the distance between the transition surface and the bottom surface of the groove gradually increases in the second direction.

[0015] In one embodiment, a plurality of the first grooves are provided on the first side of the cover plate, and the plurality of the first grooves are arranged at intervals along the first direction;

[0016] Preferably, the first side of the cover plate is provided with an uneven undulating portion, and the undulating portion is at least partially located in the bending area;

[0017] Preferably, the first side of the cover plate is provided with a plurality of first protrusions adjacent to the first groove, and the first groove and the first protrusions are arranged alternately to form an undulating portion;

[0018] Preferably, the maximum distance between the plurality of first protrusions and the bottom surface of the groove in the second direction is different;

[0019] Preferably, the maximum distance between the first protrusion located in the middle in the first direction and the bottom surface of the groove in the second direction is less than the maximum distance between the first protrusion located on both sides in the first direction and the bottom surface of the groove in the second direction.

[0020] In one embodiment, a second plane is provided on the second side of the cover plate, and the second plane is parallel to the first plane;

[0021] Preferably, the distance between the bottom surface of the first groove and the second plane in the second direction is less than the distance between the first plane and the second plane.

[0022] In one embodiment, a second groove is further provided on the second side of the cover plate. The second groove has the same structure as the first groove but faces the opposite direction.

[0023] Preferably, the projection range of the first groove along the second direction at least partially overlaps with the projection range of the second groove along the second direction;

[0024] Preferably, the second side of the cover plate is provided with a plurality of second grooves, and the plurality of second grooves are arranged at intervals along the first direction;

[0025] Preferably, the second side of the cover plate is provided with an uneven second undulation, and the second undulation is at least partially located in the bending area;

[0026] Preferably, the second side of the cover plate is provided with a plurality of second protrusions adjacent to the second groove, and the second groove and the second protrusions are arranged alternately to form the second undulating portion.

[0027] In one embodiment, the display module further includes:

[0028] A coating layer that fills the first groove and / or the second groove;

[0029] Preferably, the dimension of the coating layer in the second direction is greater than or equal to the dimension of the first groove and / or the second groove in the second direction;

[0030] Preferably, the modulus of the coating layer is less than or equal to 2 GPa and greater than or equal to 100 MPa;

[0031] Preferably, the modulus of the coating layer decreases with increasing temperature.

[0032] In one embodiment, the display module further includes:

[0033] The display panel includes a bent portion located in the bent area; the cover plate is disposed on one side of the display panel, the first side being the side of the cover plate facing the display panel;

[0034] Preferably, the cover plate is disposed on the display side of the display panel;

[0035] Preferably, when the bending radius of the bent portion is greater than or equal to 1.7 mm and less than or equal to 2.7 mm, the distance between the bottom surface of the first groove and the second plane in the second direction is greater than or equal to 50 μm and less than or equal to 100 μm.

[0036] Preferably, when the bending radius of the bent portion is greater than or equal to 1 mm and less than or equal to 1.7 mm, the distance between the bottom surface of the groove and the second plane in the second direction is greater than or equal to 30 μm and less than or equal to 50 μm;

[0037] Preferably, the display module further includes an optical adhesive layer disposed between the display panel and the cover plate, and the optical adhesive layer is located at least in the bending area.

[0038] Based on the same inventive concept, this application also provides a display device, which includes the above-described display module.

[0039] Compared with the prior art, the display module provided in this application can disperse the stress generated during bending by setting a first groove on the first side of the cover plate, and set the first boundary of the transition surface in the non-bending area to avoid stress concentration at the edge of the transition surface during bending, thereby improving the bending reliability of the display module. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] In the accompanying drawings, components with the same structure are indicated by the same numerical designation, and components with similar structures or functions are indicated by similar numerical designations. The dimensions and thicknesses of each component shown in the drawings are arbitrary, and this application does not limit the dimensions and thicknesses of each component. To make the illustrations clearer, the thickness of components is appropriately exaggerated in some places in the drawings. The drawings are not drawn to a 1:1 scale, and the relative dimensions of the elements are shown in the drawings only as examples and are not necessarily drawn to actual scale.

[0042] Figure 1 This is a schematic diagram of the layer structure of the display module in one embodiment of this application;

[0043] Figure 2 This is a schematic diagram of the layer structure of the display module in another embodiment of this application;

[0044] Figure 3 This is a partial structural schematic diagram of the cover plate in one embodiment of this application;

[0045] Figure 4 This is a partial structural diagram of the display module in another embodiment of this application;

[0046] Figure 5 This is a partial structural diagram of the display module in another embodiment of this application;

[0047] Figure 6 This is a partial structural diagram of the display module in another embodiment of this application;

[0048] Figure 7 This is a partial structural diagram of the display module in another embodiment of this application;

[0049] Figure 8 This is a partial structural diagram of the display module in another embodiment of this application;

[0050] Figure 9This is a schematic diagram of the layer structure of the display module in a folded state according to another embodiment of this application.

[0051] Marker explanation:

[0052] 100. Display module; 101. Bending area; 102. Non-bending area;

[0053] 1. Cover plate; 11. First groove; 111. Groove bottom; 112. Transition surface; 1121. First boundary; 1122. Second boundary; 12. First plane; 13. First protrusion; 14. Second plane; 15. Second groove; 2. Coating layer; 21. First coating layer; 22. Second coating layer; 3. Optical adhesive layer; 4. Display panel. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0055] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0056] Currently, in foldable screen devices, to further improve the appearance, reduce creases, and enhance surface impact resistance, the future development direction will use ultra-thin flexible glass (UFG) as the cover glass. This UFG undergoes a thinning process, with the thinning occurring in the bending zone. Generally, the boundary between the bending and non-bending zones is determined by the boundary between the overall frame boundary and the boundary of the continuous non-thinned area of ​​the BKT (Bracket) support component in the display module; the boundary closer to the bending center is used.

[0057] Through long-term research, the inventors discovered that the grooves formed at the thinning points of the cover plate have sidewalls located in the bending area. When bending or folding the bending area, the adhesive layer (such as optical adhesive layer, OCA) between the cover plate and the display panel experiences concentrated stress, leading to the risk of peeling and thus affecting bending reliability.

[0058] Based on this, this application provides a solution for a display module to solve the above problems.

[0059] like Figure 1 As shown, an embodiment of the first aspect of this application provides a display module 100 having a bent area 101 and a non-bent area 102 arranged along a first direction (X direction in the figure). The display module 100 includes a cover plate 1, which includes a first side and a second side disposed opposite to each other along a second direction (Y direction in the figure), the second direction intersecting the first direction.

[0060] The cover plate 1 has a first groove 11 and a first plane 12 on its first side. The first groove 11 includes a groove bottom surface 111 and a transition surface 112, which connects the groove bottom surface 111 and the first plane 12. Part or all of the groove bottom surface 111 is located in the bending area 101, and the transition surface 112 includes a first boundary 1121, which is connected to the first plane 12 and is located in the non-bending area 102.

[0061] Specifically, the transition surface 112 is located on the two sidewalls of the first groove 11, and the first boundary 1121 is the outer edge of the transition surface 112 on the side away from the bottom surface 111 of the groove. The dimensions of the cover plate 1 corresponding to the first plane 12, the transition surface 112, and the bottom surface 111 of the groove decrease sequentially in the second direction. In other words, the second direction is the thickness direction of the cover plate 1, and the thickness of the cover plate 1 at the first groove 11 is less than the thickness of the cover plate 1 at the first plane 12.

[0062] For example, the cover plate 1 includes ultrathin flexible glass, which has a non-thinning region, a transition region, and a thinning region. The first plane 12 corresponds to the non-thinning region, the bottom surface 111 of the first groove 11 corresponds to the thinning region, and the transition surface 112 of the first groove 11 corresponds to the transition region.

[0063] The display module 100 provided in this application embodiment, by providing a first groove 11 on the first side of the cover plate 1, with the bottom surface 111 of the groove at least partially located in the bending region 101, defines the first boundary 1121 of the transition surface 112 in the non-bending region 102, thereby changing the stress distribution in the bending region 101. When the display module 100 is bent, the first groove 11 forms a locally thinned area, which can alleviate the deformation resistance of the cover plate 1 during bending, play a buffering role, and avoid stress concentration at the outer edge of the transition surface 112, thereby improving the bending reliability of the display module 100.

[0064] like Figure 2As shown, in some other embodiments, the transition surface 112 includes a second boundary 1122, which is connected to the bottom surface 111 of the groove and is also located in the non-bending area 102.

[0065] Specifically, the second boundary 1122 is the inner edge of the transition surface 112 located on the side near the bottom surface 111 of the groove. The entire transition surface 112 is located in the non-bending region 102.

[0066] By defining the first boundary 1121 and the second boundary 1122 of the transition surface 112 as being located in the non-bending area 102, the transition surface 112 is ensured to avoid the bending area 101. This allows the stress during bending to be more evenly distributed to the non-bending area 102, further reducing stress concentration in the bending area 101, preventing the direct impact of bending deformation on the transition surface 112, and enhancing the structural stability of the display module 100.

[0067] Optionally, non-bending areas 102 are provided on both sides of the bending area 101. The non-bending areas 102 on both sides of the bending area 101 are designed to disperse bending stress and avoid excessive stress concentration; at the same time, the non-bending areas 102 on both sides of the bending area 101 provide a stable support structure for bending, thereby improving bending performance.

[0068] like Figure 3 As shown, in some other embodiments, the ratio of the first dimension L of the transition surface 112 along the first direction to the second dimension H of the transition surface 112 along the second direction is greater than 100. For example, the ratio of the first dimension L to the second dimension H is 120, 130, 150, etc.

[0069] Optionally, the first direction and the second direction are perpendicular to each other.

[0070] Specifically, by limiting the ratio of the first dimension L to the second dimension H of the transition surface 112 to be greater than 100, a narrow and gentle high ratio design is formed, which can reduce the deformation in the second direction and better guide the stress diffusion in the first direction. Thus, without increasing too much material and space, the stress dispersion effect is optimized, the stress distribution during bending is more uniform, the problem of local stress concentration is reduced, and the bending reliability of the display module is improved.

[0071] When the transition surface 112 adopts the above high ratio design, the transition surface 112 can be located in the non-bending area 102, or it can be partially located in the bending area 101 and partially located in the non-bending area 102.

[0072] like Figure 4 As shown, in some other embodiments, the shape of the transition surface 112 along a cross section (the XY plane in the figure) parallel to the first and second directions includes a curved shape.

[0073] Optionally, the transition surface 112 has an S-shaped cross-section along the first and second directions.

[0074] The transition surface 112 has a curved cross-sectional shape (such as an S-shape). Compared to a planar or simple polygonal transition surface 112, the curved transition surface 112 can more smoothly transition the height difference between the bottom surface 111 of the groove and the first plane 12, making stress changes more gradual. During the bending process, the smooth transition design can avoid material damage caused by sudden stress changes, and improve the bending life and reliability of the display module 100.

[0075] Optionally, along the direction from the bending area 101 to the non-bending area 102, the distance between the transition surface 112 and the bottom surface 111 of the groove gradually increases in the second direction. In other words, the thickness of the cover plate 1 corresponding to the transition surface 112 gradually increases along the direction from the bending area 101 to the non-bending area 102, and the transition surface 112 is a sloping surface. Alternatively, along the direction away from the bottom surface 111 of the groove, the distance between the two opposing transition surfaces 112 of the first groove 11 gradually increases in the first direction, and the first groove 11 is flared. The sloping surface design can achieve a gradual change in stiffness, avoid stress concentration caused by abrupt changes in stiffness during bending, and make the bending deformation smoother.

[0076] like Figure 5 As shown, in some other embodiments, a plurality of first grooves 11 are provided on the first side of the cover plate 1, and the plurality of first grooves 11 are arranged at intervals along a first direction.

[0077] Optionally, the first side of the cover plate 1 is provided with an uneven undulation, the undulation being at least partially located in the bending area 101.

[0078] Optionally, the first side of the cover plate 1 is provided with a plurality of first protrusions 13 adjacent to the first groove 11, and the first groove 11 and the first protrusions 13 are arranged alternately to form an undulating part.

[0079] like Figure 6 As shown, optionally, the maximum distance h3 between the plurality of first protrusions 13 and the bottom surface 111 of the groove in the second direction is different. The maximum distance h3 corresponds to the distance between the top of the first protrusion 13 and the bottom surface 111 of the groove in the second direction.

[0080] Furthermore, in the first direction, the maximum distance between the first protrusion 13 located in the middle and the bottom surface 111 of the groove in the second direction is less than the maximum distance between the first protrusion 13 located on both sides and the bottom surface 111 of the groove in the second direction. The first protrusion 13 located in the middle corresponds to the bending center of the bending region 101.

[0081] The multiple first grooves 11 increase stress dispersion points, preventing excessive deformation in a single groove area and improving bending uniformity. The alternating arrangement of the first grooves 11 and the first protrusions 13 forms an undulating section, further disrupting and dispersing stress. The maximum distance between the multiple first protrusions 13 and the bottom surface 111 of the groove is different, especially the distance between the middle first protrusion 13 and the bottom surface 111 of the groove is smaller than that of the two sides. This can accommodate the larger deformation requirements of the center of the bending area 101, while maintaining the support of the sides, avoiding excessive stress concentration in the center or on the sides, preventing collapse or warping, and enhancing the bending performance of the display module 100.

[0082] In some other embodiments, a second plane 14 is provided on the second side of the cover plate 1, and the second plane 14 is parallel to the first plane 12.

[0083] like Figure 3 As shown, optionally, the distance h1 between the bottom surface 111 of the first groove 11 and the second plane 14 in the second direction is less than the distance h2 between the first plane 12 and the second plane 14.

[0084] like Figure 7 As shown, in some embodiments, a second groove 15 is further provided on the second side of the cover plate 1. The second groove 15 has the same structure as the first groove 11 but faces opposite directions. The first groove 11 opens in the direction of the second side, and the second groove 15 opens in the direction of the second side. Specifically, the second groove 15 may include a second groove bottom surface and a second transition surface, with the second transition surface connecting the second groove bottom surface and the second plane 14. Part or all of the second groove bottom surface is located in the bending area, and the third boundary of the second transition surface that connects to the second plane 14 is located in the non-bending area 102.

[0085] Optionally, the fourth boundary of the second transition surface that connects to the bottom surface of the second groove is also located in the non-bending region 102.

[0086] Optionally, the ratio of the first dimension of the second transition surface along the first direction to the second dimension of the second transition surface along the second direction is greater than 100.

[0087] Optionally, the shape of the second transition surface along the cross section parallel to the first and second directions includes a curved shape; for example, the shape of the cross section can be S-shaped.

[0088] Optionally, the projection range of the first groove 11 along the second direction and the projection range of the second groove 15 along the second direction at least partially overlap. The first groove 11 and the second groove 15 can be designed symmetrically, or they can be staggered by a certain distance along the first direction.

[0089] Optionally, a plurality of second grooves 15 are provided on the second side of the cover plate 1, and the plurality of second grooves 15 are arranged at intervals along the first direction.

[0090] Optionally, the second side of the cover plate 1 is provided with an uneven second undulation, the second undulation being at least partially located in the bending area 101.

[0091] Optionally, the second side of the cover plate 1 is provided with a plurality of second protrusions adjacent to the second groove 15, and the second groove 15 and the second protrusions are arranged alternately to form a second undulating portion.

[0092] The design of the first groove 11 and the second groove 15 can simultaneously accommodate the inward and outward folding of the display module 100, and can also balance the stress distribution on both sides of the cover plate 1, avoiding asymmetrical bending stress caused by thinning on one side, and improving bending reliability.

[0093] In some embodiments, the display module 100 further includes a coating layer 2, which may be disposed on a first side of the cover plate 1.

[0094] like Figure 7 , Figure 8 As shown, in some embodiments, the coating layer 2 includes a first coating layer 21 and a second coating layer 22 respectively disposed on a first side and a second side of the cover plate 1. The coating layer 2 can be used to smooth the surface of the cover plate 1.

[0095] Optionally, the dimension of the first coating layer 21 in the second direction is greater than or equal to the dimension of the first groove 11 in the second direction. That is, the thickness of the first coating layer 21 is not less than the groove depth of the first groove 11. For example, the first coating layer 21 can fill the first groove 11 and cover at least a portion of the first plane 12.

[0096] Optionally, the dimension of the second coating layer 22 in the second direction is greater than or equal to the dimension of the second groove 15 in the second direction. That is, the thickness of the second coating layer 22 is not less than the groove depth of the second groove 15. For example, the second coating layer 22 can fill the second groove 15 and cover at least a portion of the second plane 14.

[0097] Optionally, the modulus of the coating layer 2 is less than or equal to 2 GPa and greater than or equal to 100 MPa.

[0098] Optionally, the modulus of coating layer 2 decreases with increasing temperature.

[0099] For example, the modulus of coating layer 2 decreases sequentially at -20℃, 25℃, and 85℃, but is always greater than or equal to 100 MPa and less than or equal to 2 GPa. Specifically, at -20℃, the modulus of coating layer 2 is 2 GPa; at room temperature (25℃), the modulus of coating layer 2 is 1.5 GPa; and at 85℃, the modulus of coating layer 2 is 100 MPa.

[0100] The use of low-modulus materials (such as elastic adhesives) absorbs the impact energy during bending, reducing stress transmitted to other adhesive layers. Simultaneously, coating layer 2 provides some support at low temperatures, preventing brittleness. The temperature-dependent modulus characteristic (softer at high temperatures, harder at low temperatures) adapts to bending requirements in different environments; for example, increased flexibility at high temperatures releases stress, while maintaining rigidity at low temperatures prevents uncontrolled deformation. This ensures that coating layer 2 maintains a certain degree of flexibility and buffering capacity under different temperature conditions, further optimizing stress distribution and protecting the structural integrity of the display module 100 during temperature changes.

[0101] like Figure 2 , Figure 9 As shown, in some embodiments, the display module 100 includes a display panel 4, which includes a bent portion located in the bending area 101. A cover plate 1 is disposed on one side of the display panel 4, with the first side being the side of the cover plate 1 facing the display panel 4.

[0102] Optionally, the cover plate 1 is disposed on the display side of the display panel 4, with the first side corresponding to the non-display side of the display panel 4. The display module 100 adopts an inward folding method.

[0103] Specifically, the display module 100 can be folded inward and outward through the bending area 101. When the display module 100 is folded inward, the bent portion of the display panel 4 is located on the side of the cover plate 1 away from the bending center; when the display module 100 is folded outward, the bent portion of the display panel 4 is located on the side of the cover plate 1 closer to the bending center.

[0104] Optionally, when the bending radius R of the bent portion is greater than or equal to 1.7 mm and less than or equal to 2.7 mm, the distance h1 between the bottom surface 111 of the first groove 11 and the second plane 14 in the second direction is greater than or equal to 50 μm and less than or equal to 100 μm. For example, when the bending radius R = 1.7 mm, h1 = 50 μm; when the bending radius R = 2 mm, h1 = 60 μm; and when the bending radius R = 2.7 mm, h1 = 100 μm.

[0105] Optionally, when the bending radius R of the bent portion is greater than or equal to 1 mm and less than or equal to 1.7 mm, the distance between the bottom surface 111 of the groove and the second plane 14 in the second direction is greater than or equal to 30 μm and less than or equal to 50 μm. For example, when the bending radius R = 1.7 mm, h1 = 50 μm; when the bending radius R = 1 mm, h1 = 30 μm.

[0106] Among them, by using parameter linkage design, stress and deformation matching under different bending scenarios is ensured, thereby improving the applicability and reliability of the technical solution.

[0107] Furthermore, the display module 100 also includes an optical adhesive layer 3, which is disposed between the display panel 4 and the cover plate 1. The optical adhesive layer 3 is located in the bending area 101 and the non-bending area 102. Specifically, the optical adhesive layer 3 is located between the display panel 4 and the coating layer 2. The projection range of the optical adhesive layer 3 along the second direction at least covers the first groove 11. Wherein, the optical adhesive layer 3 is located in the bending area 101, which can enhance the connection stability between the cover plate 1 and the display panel 4. Since the first groove 11 is at least partially located in the non-bending area 102, it can prevent the optical adhesive layer 3 from detaching due to edge stress concentration during bending, ensuring the integrity and uniformity of the adhesive effect.

[0108] Simulation experiments were conducted on the stress on the optical adhesive layer 3 under different relative positions of the transition surface 112, the bending region 101, and the non-bending region 102 to assess the risk of bending. The simulation results are shown in Table 1.

[0109] Table 1

[0110]

[0111] The data in the table shows that when the transition surface 112 avoids the bending region 101, the stress on the optical adhesive layer 3 is 0.69 MPa; while when the transition surface 112 does not avoid the bending region 101, the stress on the optical adhesive layer 3 is between 0.73 and 0.76 MPa. This indicates that the design scheme where the transition surface 112 is located in the non-bending region 102 can effectively reduce the stress on the optical adhesive layer 3. The reason is that the transition surface 112 avoids the bending region 101, which reduces the compression and stretching of the adhesive layer, thereby reducing the force borne by the optical adhesive layer 3.

[0112] Furthermore, in the embodiment where part of the transition surface 112 is located in the bending region 101, as the L:H ratio decreases (e.g., from 11.3 mm:90 μm to 4.9 mm:90 μm), the stress on the optical adhesive layer 3 tends to increase (from 0.73 to 0.76). This indicates that a larger L:H ratio is more conducive to stress dispersion and reduces the stress on the optical adhesive layer 3. A larger L:H ratio means that the transition surface 112 has a wider area in the first direction to disperse the stress generated during bending, thereby reducing the stress on the optical adhesive layer 3.

[0113] The lower the stress on the optical adhesive layer 3, the lower the risk of bending. By using a transition surface 112 to avoid the bending zone 101 and a larger L:H ratio, the stress on the optical adhesive layer 3 can be reduced, effectively improving the bending reliability of the display module 100. In practical applications, a design where the transition surface 112 avoids the bending zone 101 and ensures a suitable L:H ratio should be prioritized to reduce the probability of malfunctions during bending of the foldable screen, thereby improving product quality and lifespan.

[0114] Based on the same inventive concept, another embodiment of this application provides a display device that includes the display module described in the above embodiments. Furthermore, the display device includes mobile phones, VR devices, computers, televisions, in-vehicle display devices, etc.

[0115] This embodiment provides a display device in which a first groove 11 is provided on the first side of the cover plate 1, and the bottom surface 111 of the groove is at least partially located in the bending area 101. This limits the first boundary 1121 of the transition surface 112 to the non-bending area 102, thereby changing the stress distribution in the bending area 101. When the display module 100 is bent, the first groove 11 forms a locally thinned area, which alleviates the deformation resistance of the cover plate 1 during bending, plays a buffering role, and avoids stress concentration at the outer edge of the transition surface 112, thereby improving the bending reliability of the display module 100.

[0116] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0117] It should be noted that the above description describes some embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0118] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A display module, characterized in that, The display module includes bent and non-bent areas arranged along a first direction. A cover plate, the cover plate including a first side and a second side disposed opposite to each other along a second direction, the second direction intersecting the first direction; The cover plate has a first groove and a first plane on its first side. The first groove includes a bottom surface and a transition surface, and the transition surface connects the bottom surface and the first plane. The bottom surface is at least partially located in the bending area, and the transition surface includes a first boundary connected to the first plane, which is located in the non-bending area.

2. The display module according to claim 1, characterized in that, The transition surface includes a second boundary connected to the bottom surface of the groove, and the second boundary is located in the non-bending area; Preferably, non-bending areas are provided on both sides of the bending area.

3. The display module according to claim 1, characterized in that, The ratio of the first dimension of the transition surface along the first direction to the second dimension of the transition surface along the second direction is greater than 100; Preferably, the first direction is perpendicular to the second direction.

4. The display module according to claim 1, characterized in that, The shape of the transition surface along a cross section parallel to the first and second directions includes a curved shape; Preferably, the transition surface has an S-shaped cross-section parallel to the first and second directions; Preferably, along the direction from the bending area to the non-bending area, the distance between the transition surface and the bottom surface of the groove gradually increases in the second direction.

5. The display module according to claim 1, characterized in that, The cover plate has a plurality of the first grooves on its first side, and the plurality of the first grooves are arranged at intervals along the first direction. Preferably, the first side of the cover plate is provided with an uneven undulating portion, and the undulating portion is at least partially located in the bending area; Preferably, the first side of the cover plate is provided with a plurality of first protrusions adjacent to the first groove, and the first groove and the first protrusions are arranged alternately to form an undulating portion; Preferably, the maximum distance between the plurality of first protrusions and the bottom surface of the groove in the second direction is different; Preferably, the maximum distance between the first protrusion located in the middle in the first direction and the bottom surface of the groove in the second direction is less than the maximum distance between the first protrusion located on both sides in the first direction and the bottom surface of the groove in the second direction.

6. The display module according to claim 1, characterized in that, The cover plate has a second plane on its second side, and the second plane is parallel to the first plane. Preferably, the distance between the bottom surface of the first groove and the second plane in the second direction is less than the distance between the first plane and the second plane.

7. The display module according to claim 6, characterized in that, The second side of the cover plate is also provided with a second groove, which has the same structure as the first groove but faces the opposite direction. Preferably, the projection range of the first groove along the second direction at least partially overlaps with the projection range of the second groove along the second direction; Preferably, the second side of the cover plate is provided with a plurality of second grooves, and the plurality of second grooves are arranged at intervals along the first direction; Preferably, the second side of the cover plate is provided with an uneven second undulation, and the second undulation is at least partially located in the bending area; Preferably, the second side of the cover plate is provided with a plurality of second protrusions adjacent to the second groove, and the second groove and the second protrusions are arranged alternately to form the second undulating portion.

8. The display module according to claim 7, characterized in that, The display module also includes: A coating layer that fills the first groove and / or the second groove; Preferably, the dimension of the coating layer in the second direction is greater than or equal to the dimension of the first groove and / or the second groove in the second direction; Preferably, the modulus of the coating layer is less than or equal to 2 GPa and greater than or equal to 100 MPa; Preferably, the modulus of the coating layer decreases with increasing temperature.

9. The display module according to claim 6, characterized in that, The display module also includes: The display panel includes a bent portion located in the bent area; the cover plate is disposed on one side of the display panel, the first side being the side of the cover plate facing the display panel; Preferably, the cover plate is disposed on the display side of the display panel; Preferably, when the bending radius of the bent portion is greater than or equal to 1.7 mm and less than or equal to 2.7 mm, the distance between the bottom surface of the first groove and the second plane in the second direction is greater than or equal to 50 μm and less than or equal to 100 μm. Preferably, when the bending radius of the bent portion is greater than or equal to 1 mm and less than or equal to 1.7 mm, the distance between the bottom surface of the groove and the second plane in the second direction is greater than or equal to 30 μm and less than or equal to 50 μm; Preferably, the display module further includes an optical adhesive layer disposed between the display panel and the cover plate, and the optical adhesive layer is located at least in the bending area.

10. A display device, characterized in that, Includes the display module as described in any one of claims 1-9.

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