Cover plate and display module

Abstract

This disclosure provides a cover plate, a cover plate assembly, and a display module. The cover plate includes at least one transition region and at least one first region, with the first region adjacent to the transition region. The thickness of the first region is less than the thickness of the transition region, such that the transition region has a side surface facing the first region on one side of the cover plate. On one side of the cover plate, at least one first sub-groove is provided at the interface between the side surface of the transition region and the surface of the first region. The thickness of at least a portion of the cover plate located in the first sub-groove is less than the thickness of at least a portion of the cover plate located in the first region. The first sub-groove allows partial release of lateral stress in the first region caused by expansion during tempering, thereby reducing stress concentration at the interface between the first region and the transition region. This avoids or mitigates wrinkling problems in the first region or transition region caused by differences in tempering expansion, thereby improving the yield and reliability of the cover plate.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, specifically, the design of a cover plate and a display module. Background Technology

[0002] With existing flexible displays primarily using organic materials, creases on foldable or curved displays are severe. In recent years, to improve impact resistance and ensure bending performance, manufacturers have been developing cover plates of varying thicknesses. However, the results have been unsatisfactory. Summary of the Invention

[0003] A first aspect of this disclosure provides a cover plate including at least one transition region and at least one first region, the first region being adjacent to the transition region and having a thickness less than that of the transition region, such that the transition region has a side surface facing the first region on one side of the cover plate. On one side of the cover plate, at least one first sub-groove is provided at the junction of the side surface of the transition region and the surface of the first region, the thickness of at least a portion of the cover plate located in the first sub-groove being less than the thickness of at least a portion of the cover plate located in the first region.

[0004] In the above scheme, the first sub-groove can partially release the lateral stress (extending from the first area to the transition area) caused by the expansion during the tempering process in the first area, thereby reducing the stress concentrated at the junction of the first area and the transition area, so as to avoid or mitigate the wrinkling problem in the first area or the transition area caused by the difference in tempering expansion, thereby improving the yield and reliability of the cover plate.

[0005] In one specific embodiment of the first aspect of this disclosure, the cover plate includes only a transition zone.

[0006] In another specific embodiment of the first aspect of this disclosure, the cover plate includes at least two transition zones, a first zone located between adjacent transition zones, and on one side of the cover plate, the surfaces of the transition zones and the first zone form a groove, the side surface of the transition zones forms the side surface of the groove, and the surface of the first zone forms the bottom surface of the groove.

[0007] In one specific embodiment of the first aspect of this disclosure, the surface of the first sub-groove includes a smooth surface. This allows stress to be dispersed on the surface of the first sub-groove, thereby reducing the risk of stress concentration in the first sub-groove.

[0008] In one specific embodiment of the first aspect of this disclosure, on the side of the cover plate where the first sub-groove is provided, the surface of the first sub-groove is smoothly in contact with the surface of the cover plate located in the first region, and / or, the surface of the first sub-groove is smoothly in contact with the surface of the cover plate located in the transition region. This reduces the risk of stress concentration around the location of the first sub-groove.

[0009] In one specific embodiment of the first aspect of this disclosure, the first sub-groove has an arc shape in the cross-section of the cover plate along the direction from the transition region to the first region, and the cross-section of the cover plate is perpendicular to the surface on which the cover plate is located.

[0010] In another specific embodiment of the first aspect of this disclosure, along the direction from the transition region to the first region, the pattern of the first sub-groove on the cross-section of the cover plate includes a wavy shape, and the cross-section of the cover plate is perpendicular to the surface on which the cover plate is located.

[0011] In one specific embodiment of the first aspect of this disclosure, the orthographic projection of the first sub-groove onto the surface where the cover plate is located includes a strip shape, and the extension direction of the first sub-groove is perpendicular to the direction from the transition region to the first region.

[0012] Optionally, a first sub-groove is provided at the junction of the side surface of the transition zone and the surface of the first zone, the first sub-groove extending from one side edge of the cover plate to the opposite side edge.

[0013] Optionally, a first sub-groove is provided at the junction of the side surface of the transition zone and the surface of the first zone, with only one end of the first sub-groove extending to the edge of the cover plate.

[0014] Optionally, a plurality of first sub-grooves spaced apart from each other are provided at the junction of the side surface of the transition zone and the surface of the first zone, and the first sub-grooves are arranged sequentially along a direction perpendicular to the direction from the transition zone to the first zone.

[0015] Optionally, when at least two transition zones are provided, the first zone is located between adjacent transition zones, and first sub-grooves are respectively provided at the junction of the two opposite side surfaces on both sides of the first zone and the surface of the first zone, with their orthographic projections on the surface of the cover plate symmetrically distributed about the first zone. In this way, when the cover plate is folded or bent, the stress distribution on both sides of the first zone will be relatively uniform (the stress distribution and magnitude are basically equal), thereby further reducing the risk of stress concentration.

[0016] In one specific embodiment of the first aspect of this disclosure, the depth of the first sub-groove is greater than or equal to 5 micrometers.

[0017] In one specific embodiment of the first aspect of this disclosure, the side surface of the transition zone includes at least one first pleated pattern, and the surface of the first pleated pattern in a cross section perpendicular to the plane where the cover plate is located includes a curved shape along the direction from the transition zone to the first zone.

[0018] In the above scheme, the first fold pattern can gradually release the stress generated by the expansion of the first region and the transition region in the transition region through the first fold pattern, thereby reducing the risk of stress concentration at the junction of the transition region and the first region and in the transition region.

[0019] In one embodiment of the first aspect of this disclosure, the first pleated pattern includes recesses or protrusions.

[0020] In one specific embodiment of the first aspect of this disclosure, the side surface of the transition region includes a plurality of first fold patterns, which are smoothly connected to each other.

[0021] Optionally, along the direction from the transition zone to the first zone, the surface of the first pleated pattern in a cross section perpendicular to the plane where the cover plate is located includes a wavy shape.

[0022] In another specific embodiment of the first aspect of this disclosure, the side surface of the transition region further includes at least two first sub-surfaces, the first fold pattern being located between at least two adjacent first sub-surfaces, and the surface of the first fold pattern being smoothly connected to the adjacent first sub-surfaces.

[0023] In one specific embodiment of the first aspect of this disclosure, the side surface of the transition zone includes a plurality of first sub-surfaces arranged in a stepped pattern. The first sub-surfaces are ordered from near the first zone to far away from the first zone. The first sub-surface with sequence number n and the first sub-surface with sequence number (n+1) form a step, where n is an odd number and greater than or equal to 1. A first fold pattern is provided between the first sub-surface with sequence number (n+1) and the first sub-surface with sequence number (n+2), and the first fold pattern between the first sub-surface with sequence number (n+1) and the first sub-surface with sequence number (n+2) includes a recess. This is equivalent to providing a first fold pattern at the inner corner of the step, so that the lateral stress generated when the cover plate expands can be released.

[0024] Optionally, the first fold pattern is located at the junction of two adjacent steps, the height difference between the (q+1)th step and the qth step is greater than the height difference between the (m+1)th step and the mth step, the depth of the depression between the (q+1)th step and the qth step is greater than the depth of the depression between the (m+1)th step and the mth step, q and m are positive integers greater than or equal to 1, and q and m are different.

[0025] Optionally, the first sub-surface with serial number n is smoothly connected to the first sub-surface with serial number (n+1). This reduces the risk of stress concentration at the connection point of the two first sub-surfaces.

[0026] In one specific embodiment of the first aspect of this disclosure, when at least two transition zones are provided, the first zone is located between adjacent transition zones, and the orthographic projections of the first fold patterns on the two opposite side surfaces of the transition zones on both sides of the first zone onto the surface where the cover plate is located are symmetrically distributed about the first zone. Thus, when the cover plate is folded or bent, the stress distribution in the transition zones will be relatively uniform (the stress distribution and magnitude are substantially equal), thereby further reducing the risk of stress concentration.

[0027] In one specific embodiment of the first aspect of this disclosure, on the side surface of each transition zone, the orthographic projection of the first pleated pattern onto the surface where the cover plate is located includes a stripe, and the extension direction of the first pleated pattern is perpendicular to the direction from the transition zone to the first zone.

[0028] In one specific embodiment of the first aspect of this disclosure, on the side surface of each transition zone, a plurality of first pleated patterns are arranged sequentially in a direction away from the first zone, and each first pleated pattern extends from one side edge of the cover plate to the opposite side edge.

[0029] In another specific embodiment of the first aspect of this disclosure, on the side surface of each transition zone, a plurality of first pleated patterns are arranged sequentially in a direction away from the first zone, each first pleated pattern having only one end extending to one side edge of the cover plate, and the edges of the cover plate to which the ends of adjacent first pleated patterns extend are located on opposite sides of the cover plate.

[0030] In another specific embodiment of the first aspect of this disclosure, on the side surface of each transition zone, a plurality of first pleated patterns are arranged sequentially in a direction away from the first zone and are classified as a first pattern, a second pattern and a third pattern. The first pattern and the third pattern are located on both sides of the second pattern. The second pattern extends from one side edge of the cover plate to the opposite side edge. Only one end of the first pattern and the third pattern extends to one side edge of the cover plate, and the edges of the cover plate to which the ends of the first pattern and the third pattern on both sides of the second pattern extend are located on opposite sides of the cover plate.

[0031] In another specific embodiment of the first aspect of this disclosure, on the side surface of each transition zone, a plurality of first fold patterns are arranged in multiple rows and columns on the surface where the cover plate is located, with the column direction parallel to the direction from the transition zone to the first zone and the row direction perpendicular to the direction from the transition zone to the first zone.

[0032] In one specific embodiment of the first aspect of this disclosure, the cover plate further includes at least one second region adjacent to the transition region, the thickness of the second region being greater than the thickness of the transition region. The thickness of the second region can increase the strength of the cover plate edge to protect the bezel of the underlying structure, such as the display panel described below.

[0033] Optionally, there may be two second zones, located on opposite sides of the cover plate, with the transition zone and the first zone located between the two second zones.

[0034] In one specific embodiment of the first aspect of this disclosure, the surface of the first region includes at least one second fold pattern. Along the direction from the transition region to the first region, the surface of the second fold pattern has a curved shape on a cross-section perpendicular to the plane where the cover plate is located. The second fold pattern allows the stress generated by the expansion of the first region to be gradually released in the transition region through the first fold pattern, thereby reducing the risk of stress concentration at the junction of the transition region and the first region, and within the transition region itself.

[0035] Optionally, the second pleat pattern may include recesses or protrusions.

[0036] In one specific embodiment of the first aspect of this disclosure, the surface of the first region further includes at least two second sub-surfaces distributed along the direction from the transition region to the first region, the second fold pattern being located between at least two adjacent second sub-surfaces, and the surface of the second fold pattern being smoothly connected to the adjacent second sub-surfaces.

[0037] In one specific embodiment of the first aspect of this disclosure, the orthographic projection of the second fold pattern on the surface of the first region onto the surface of the cover plate is symmetrically distributed about an axis of symmetry passing through the centroid of the first region and perpendicular to the direction from the transition region to the first region; and / or, the orthographic projection of the second fold pattern on the surface of the first region onto the surface of the cover plate is centrally symmetrically distributed about the centroid of the surface of the first region. Thus, when the cover plate is folded or bent, the stress distribution in the first region will be relatively uniform (the stress distribution and magnitude will be substantially equal), thereby further reducing the risk of stress concentration.

[0038] In one specific embodiment of the first aspect of this disclosure, the orthographic projection of the second pleated pattern onto the surface where the cover plate is located includes stripes, and the extension direction of the second pleated pattern is perpendicular to the direction from the transition area to the first area.

[0039] In one embodiment of the first aspect of this disclosure, each second pleat pattern extends from one edge of the cover plate to the opposite edge.

[0040] In another specific embodiment of the first aspect of this disclosure, each second pleated pattern extends to one side edge of the cover plate at only one end, and the edges of the cover plate to which the ends of adjacent second pleated patterns extend are located on opposite sides of the cover plate.

[0041] In another specific embodiment of the first aspect of this disclosure, a plurality of second pleated patterns are classified into a fourth pattern, a fifth pattern and a sixth pattern, the fourth pattern and the sixth pattern being located on both sides of the fifth pattern, the fifth pattern extending from one side edge of the cover plate to the opposite side edge, the fourth pattern and the sixth pattern extending only at one end to one side edge of the cover plate, and the edges of the cover plate to which the ends of the fourth pattern and the sixth pattern on both sides of the fifth pattern extend are located on opposite sides of the cover plate.

[0042] In another specific embodiment of the first aspect of this disclosure, the orthographic projections of a plurality of second fold patterns on the surface of the cover plate are arranged in multiple rows and columns, the direction of the columns being perpendicular to the direction from the transition zone to the first zone (perpendicular to the aforementioned axis of symmetry), and the direction of the rows being parallel to the direction from the transition zone to the first zone (parallel to the aforementioned axis of symmetry).

[0043] A second aspect of this disclosure provides a cover plate including at least one transition region and at least one first region, the first region being adjacent to the transition region. On one side of the cover plate in the thickness direction, the transition region protrudes from the first region, and at least one first sub-groove is provided at the junction of the portion of the transition region protruding from the first region and the first region. The thickness of at least a portion of the cover plate located in the first sub-groove is less than the thickness of at least a portion of the cover plate located in the first region.

[0044] In another specific embodiment of the second aspect of this disclosure, the portion of the transition region protruding from the first region includes a side surface facing the first region, the side surface being stepped.

[0045] A third aspect of this disclosure provides a display module that includes the cover plate described in the first or second aspect above.

[0046] In one specific embodiment of the second aspect of this disclosure, the display module may further include a protective adhesive layer covering the outer peripheral surface of the cover plate and one side surface of the side surface where the transition area is provided, and the protective adhesive layer is a planarization film layer.

[0047] Optionally, the display module also includes a protective film located on the side of the cover plate away from the protective adhesive layer.

[0048] Optionally, the display module also includes an adhesive layer located between the cover plate and the protective film.

[0049] Optionally, the display module also includes a light-shielding structure located on the surface of the protective film facing the cover plate and covering the edge of the protective film. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the planar structure of a cover plate under one design, provided as an embodiment of the present disclosure.

[0051] Figure 2for Figure 1 The cover plate shown is a cross-sectional view along M1-N1.

[0052] Figure 3A for Figure 2 An enlarged view of region S1 of the cover plate under one design scheme.

[0053] Figure 3B for Figure 2 An enlarged view of region S1 of the cover plate in another design scheme.

[0054] Figure 4A This is a schematic diagram of the planar structure of a cover plate under another design, which is an embodiment of the present disclosure.

[0055] Figure 4B for Figure 4A The cover plate shown is a cross-sectional view along M2-N2.

[0056] Figure 5A This is a schematic diagram of the planar structure of a cover plate under another design, which is an embodiment of the present disclosure.

[0057] Figure 5B This is a schematic diagram of the planar structure of a cover plate under another design, which is an embodiment of the present disclosure.

[0058] Figure 6A A cross-sectional view of a cover plate provided in one embodiment of this disclosure under another design.

[0059] Figure 6B for Figure 6A An enlarged view of region S2 of the cover plate shown.

[0060] Figure 7A A cross-sectional view of a cover plate provided in one embodiment of this disclosure under another design.

[0061] Figure 7B for Figure 7A An enlarged view of region S3 of the cover plate shown.

[0062] Figure 7C for Figure 7A An enlarged view of region S4 of the cover plate shown.

[0063] Figure 8 A cross-sectional view of a cover plate provided in one embodiment of this disclosure under another design.

[0064] Figure 9 A cross-sectional view of a cover plate provided in one embodiment of this disclosure under another design.

[0065] Figure 10A This is a schematic diagram of the planar structure of a cover plate under another design, which is an embodiment of the present disclosure.

[0066] Figure 10B This is a schematic diagram of the planar structure of a cover plate under another design, which is an embodiment of the present disclosure.

[0067] Figure 10C This is a schematic diagram of the planar structure of a cover plate under another design, which is an embodiment of the present disclosure.

[0068] Figure 10D This is a schematic diagram of the planar structure of a cover plate under another design, which is an embodiment of the present disclosure.

[0069] Figure 11A A cross-sectional view of a cover plate provided in one embodiment of this disclosure under another design.

[0070] Figure 11B A cross-sectional view of a cover plate provided in one embodiment of this disclosure under another design.

[0071] Figure 12A This is a schematic diagram of the planar structure of a cover plate under another design, which is an embodiment of the present disclosure.

[0072] Figure 12B This is a schematic diagram of the planar structure of a cover plate under another design, which is an embodiment of the present disclosure.

[0073] Figure 12C This is a schematic diagram of the planar structure of a cover plate under another design, which is an embodiment of the present disclosure.

[0074] Figure 12D This is a schematic diagram of the planar structure of a cover plate under another design, which is an embodiment of the present disclosure.

[0075] Figure 13A A cross-sectional view of a cover plate provided in one embodiment of this disclosure under another design.

[0076] Figure 13B A cross-sectional view of a cover plate provided in one embodiment of this disclosure under another design.

[0077] Figure 14A This is a schematic diagram of the planar structure of a cover plate under another design, which is an embodiment of the present disclosure.

[0078] Figure 14B for Figure 14A The cross-sectional view of the cover plate is shown.

[0079] Figure 15 This is a schematic diagram of the structure of a cover plate assembly provided in one embodiment of the present disclosure.

[0080] Figure 16This is a schematic diagram of the structure of a display module provided in one embodiment of the present disclosure.

[0081] Explanation of reference numerals in the attached figures:

[0082] 10-Cover plate assembly; 11-First zone; 12-Transition zone; 13-Second zone; 20-Display panel;

[0083] 100 - Cover plate; 101 - Side surface; 102 - Bottom surface; 110 - First sub-groove; 120 - First pleated pattern; 120a - First pattern; 120b - Second pattern; 120c - Third pattern; 121 - First sub-surface; 130 - Second pleated pattern; 130a - Fourth pattern; 130b - Fifth pattern; 130c - Sixth pattern; 131 - Second sub-surface;

[0084] 200 - Protective adhesive layer; 300 - Protective film; 400 - Adhesive layer; 500 - Light-shielding structure. Detailed Implementation

[0085] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this specification.

[0086] This disclosure provides a cover plate and a display module to at least solve the stress concentration problem caused by uneven cover plate thickness. The cover plate includes at least one transition region and at least one first region, the first region being adjacent to the transition region. The thickness of the first region is less than the thickness of the transition region, such that the transition region has a side surface facing the first region on one side of the cover plate. On one side of the cover plate, at least one first sub-groove is provided at the junction of the side surface of the transition region and the surface of the first region. The thickness of at least a portion of the cover plate located in the first sub-groove is less than the thickness of at least a portion of the cover plate located in the first region. The cover plate requires tempering to improve its bending performance. To improve the bending performance of the cover plate, a portion of the first region of the cover plate is thinned, resulting in a thickness difference between the first region and the transition region. During the tempering process, this thickness difference at the junction of the first region and the transition region may cause stress concentration due to expansion, leading to cover plate damage or easy damage during subsequent use due to excessive stress concentration. In the above scheme, the first sub-groove can partially release the lateral stress (extending from the first area to the transition area) caused by the expansion during the tempering process in the first area, thereby reducing the stress concentrated at the junction of the first area and the transition area, so as to avoid or mitigate the wrinkling problem in the groove area or transition area caused by the difference in tempering expansion, thereby improving the yield and reliability of the cover plate.

[0087] The structure of the cover plate and display module according to at least one embodiment of the present disclosure will now be described in detail with reference to the accompanying drawings. Furthermore, in these drawings, a spatial rectangular coordinate system is established with the surface of the cover plate (e.g., its flat main surface) as a reference to more intuitively present the positional relationships of the relevant structures in the cover plate. In this spatial rectangular coordinate system, the X-axis and Y-axis are parallel to the surface of the cover plate, and the Z-axis is perpendicular to the surface of the cover plate.

[0088] like Figures 1 to 3A As shown, the cover plate 100 includes two transition zones 12 and a first zone 11 located between the transition zones 12, on one side of the cover plate 100 ( Figure 2 The surfaces of the transition region 12 and the first region 11 form a groove, which is surrounded by two side surfaces 101 and a bottom surface 102. The surface of the transition region 12 forms the side surface 101 of the transition region 12, and the surface of the first region 11 forms the bottom surface 102 of the groove. The side surface 101 is the surface of the transition region 12 facing the groove, and can therefore be considered to also face the first region 11. At least one first sub-groove 110 is provided at the junction of the side surface 101 and the bottom surface 102 of the transition region. Figure 1 (As shown in the diagram, one portion of the cover plate 100 located in the first sub-groove 110 has a thickness less than the thickness of the cover plate 100 located in the first region 11. For example, the first region 11 corresponds to the thinning region of the cover plate 100. The thickness of the transition region 12, except for the area where it intersects with the first region 11, is greater than the thickness of the first region 11. For example, along a direction away from the first region 11 (e.g., a direction parallel to the X-axis), the thickness of the transition region 12 generally shows an increasing trend. The cover plate 100 needs to be tempered to improve its bending performance. Because of the groove, the first region 11 is actually thinned relative to the transition region 12. Due to the thickness difference between the first region 11 and the transition region 12, stress concentration may occur at the junction of the first region 11 and the transition region 12 during the tempering process due to expansion, which may cause the cover plate 100 to be damaged, or it may be easily damaged due to excessive stress concentration during subsequent use. In embodiments of this disclosure, the first sub-groove 110 can partially release the lateral stress generated in the first region 11 during the expansion process (extending from the first region 11 to the transition region 12, parallel to the X-axis direction), thereby reducing the stress concentrated in the first region 11 and the transition region 12, so as to improve the yield and reliability of the cover plate 100.

[0089] It should be noted that in the embodiments disclosed herein, there is no limitation on the number of the first zone and the transition zone, and the specific number can be designed according to the application scenario of the cover plate.

[0090] In another specific embodiment of the first aspect of this disclosure, the cover plate includes at least two transition zones, a first zone located between adjacent transition zones, and on one side of the cover plate, the surfaces of the transition zones and the first zone form a groove, the side surface of the transition zones forming the side surface of the groove, and the surface of the first zone forming the bottom surface of the groove. For the case with two transition zones, see [example missing]. Figures 1 to 3A The relevant descriptions in the illustrated embodiments.

[0091] For example, in other embodiments of this disclosure, such as Figure 4A and Figure 4B As shown, the cover plate 100 may include only one transition zone 12, and correspondingly, the first zone 11 may also be provided only once.

[0092] In the embodiments of this disclosure, when there is one transition zone 12, the structure of the cover plate 100 can also be represented when there are two or more transition zones 12 (forming grooves). Therefore, in the following embodiments, the structure of the cover plate 100 when there is only one transition zone will be described simultaneously by describing the case where the cover plate is provided with at least two transition zones 12 (forming grooves).

[0093] Furthermore, in the embodiments described below, when the cover plate includes at least two transition zones to form a groove, the side surface of the transition zone can participate in forming the side surface of the groove. Therefore, the side surface of the transition zone also refers to the side surface of the groove, and correspondingly, the surface of the first zone also refers to the bottom surface of the groove.

[0094] See again for at least one embodiment of this disclosure. Figure 3A The surface of the first sub-groove 110 includes a smooth surface. This allows stress to be dispersed on the surface of the first sub-groove 110, thereby reducing the risk of stress concentration in the first sub-groove 110.

[0095] See again for at least one embodiment of this disclosure. Figure 3A On the side of the cover plate 100 where the first sub-groove 110 is provided, the surface of the first sub-groove 110 smoothly contacts the surface of the cover plate 100 located in the first region 11, and the surface of the first sub-groove 110 smoothly contacts the surface of the cover plate 100 located in the transition region 12. Thus, no sharp angle structure appears at the edge of the first sub-groove 110, and stress can still be dispersed and released at that location, thereby reducing the risk of stress concentration around the location of the first sub-groove 110.

[0096] In some embodiments of this disclosure, please refer to [the relevant documentation]. Figure 3AThe first sub-groove 110 has an arc shape on the cross section of the cover plate 100. The cross section of the cover plate 100 is perpendicular to the surface on which the cover plate 100 is located. For example, the direction of the cross section can be along the direction from the transition zone 12 to the first zone 11. The first sub-groove 110 with an arc-shaped cross section can make the stress evenly distributed to reduce the risk of stress concentration.

[0097] For example, the arc can be a circular arc (a perfectly circular arc), an elliptical arc, etc.

[0098] In other embodiments of this disclosure, such as Figure 3B As shown, along the direction from the transition zone 12 to the first zone 11, the pattern of the first sub-groove 110 on the cross-section of the cover plate 100 includes a wavy shape, and the cross-section of the cover plate 100 is perpendicular to the surface on which the cover plate 100 is located. For example, the direction of this cross-section can be along the direction from the transition zone 12 to the first zone 11. The first sub-groove 110 with a wavy cross-section can make the stress evenly distributed, thereby reducing the risk of stress concentration. For example, in Figure 3B Based on the structure shown, the cross-section of the first sub-groove 110 can be further designed to be roughly arc-shaped, thus taking into account the advantages of arc and wave shapes in dispersing stress.

[0099] It should be noted that the wave shape needs to be designed as a smooth curve (without sharp angles) to reduce the risk of stress concentration in local areas.

[0100] In at least one embodiment of this disclosure, such as Figure 1 As shown, the orthographic projection of the first sub-groove 110 onto the surface of the cover plate 100 is a straight line segment, and the extension direction of the first sub-groove 110 (the direction of the Y-axis) is perpendicular to the direction from the transition area 12 to the first area 11 (the direction parallel to the X-axis).

[0101] In the embodiments of this disclosure, the arrangement of the first sub-groove 110 can be designed according to the actual process requirements, and an exemplary arrangement is as follows.

[0102] In one example, such as Figure 1 As shown, a first sub-groove 110 is provided at the junction of the side surface 101 and the bottom surface 102 of the transition zone. The first sub-groove 110 extends from one side edge of the cover plate 100 to the opposite side edge.

[0103] In another example, such as Figure 5A As shown, a first sub-groove 110 is provided at the junction of the side surface 101 and the bottom surface 102 of the transition zone. The first sub-groove 110 extends to the edge of the cover plate 100 at only one end.

[0104] In another example, such as Figure 5BAs shown, a plurality of first sub-grooves 110 spaced apart from each other are provided at the junction of the side surface 101 and the bottom surface 102 of the transition zone. The first sub-grooves 110 are arranged along the direction from the transition zone 12 to the first zone 11. Figure 5B The direction of the X-axis in the middle) the perpendicular direction ( Figure 5B Arranged sequentially along the Y-axis.

[0105] In at least one embodiment of this disclosure, such as Figure 1 , Figure 5A and Figure 5B The first sub-grooves 110, respectively provided at the junction of the two opposing side surfaces 101 and bottom surface 102 of the groove shown, are symmetrically distributed about the first region 11 on the orthographic projection of the cover plate 100. For example, the axis of symmetry YY representing this symmetrical distribution can pass through the centroid O1 of the first region 11, and the extension direction of the axis of symmetry YY is perpendicular to the direction from the transition region 12 to the first region 11 (the direction of the X-axis). In this way, when the cover plate 100 is folded or bent, the stress distribution on both sides of the first region 11 will be relatively uniform (the stress distribution and magnitude are basically equal), thereby further reducing the risk of stress concentration.

[0106] In embodiments of this disclosure, the depth of the first sub-groove 110 is greater than or equal to 5 micrometers. Within this range, the stress generated by the expansion of the first region can be released to the greatest extent while ensuring the strength of the cover plate, thereby ensuring the yield of the cover plate. For example, the depth of the first sub-groove 110 is greater than or equal to 5.5 micrometers, 6 micrometers, 6.5 micrometers, 7 micrometers, etc. For example, the depth of the first sub-groove 110 is less than the thickness of the first region.

[0107] In the embodiments of this disclosure, the stress generated in the first region is transmitted to the transition region, and the transition region also generates a certain stress when it expands. Thus, a structure similar to the first sub-groove described above can be provided in the transition region to release stress.

[0108] For example, such as Figure 6A and Figure 6B As shown, the side surface 101 of the groove (corresponding to the transition region 12) includes at least one first pleated pattern 120. Along the direction from the transition region 12 to the first region 11, the surface of the first pleated pattern 120 has a curved shape in a cross-section perpendicular to the plane containing the cover plate 100. Thus, the first pleated pattern 120 allows the stress generated by the expansion of the first region 11 and the transition region 12 to be gradually released within the transition region 12, thereby reducing the risk of stress concentration at the junction of the transition region 12 and the first region 11, and within the transition region 12 itself.

[0109] In at least one embodiment of this disclosure, the first pleat pattern 120 includes recesses (such as...) Figure 6A and Figure 6B(as shown) or protrusions (such as) Figure 7A and Figure 7B (As shown). Thus, the arrangement of the first pleated pattern 120 is equivalent to increasing the surface area of ​​the side surface 101 of the groove, which is more conducive to the dispersion and release of stress at the side surface 101, thereby reducing the risk of stress concentration in the cover plate.

[0110] When a first pleated pattern 120 is provided on the side surface 101, the specific type of the first pleated pattern 120 and its area ratio on the side surface 101 are not limited in the embodiments disclosed herein, and can be designed according to the actual process requirements. The following is an exemplary description in conjunction with specific embodiments.

[0111] In some embodiments of this disclosure, such as Figure 6A or Figure 7A As shown, the side surface 101 of the groove also includes at least two first sub-surfaces 121, and the first pleated pattern 120 is located between at least two adjacent first sub-surfaces 121, and the surface of the first pleated pattern 120 is smoothly connected to the adjacent first sub-surfaces 121. For example, the surface where the first sub-surface 121 is located intersects with the surface where the cover plate 100 is located but is not perpendicular, that is, the first sub-surface 121 is a slope.

[0112] In other embodiments of this disclosure, such as Figure 8 As shown, the side surface 101 of the groove includes a plurality of first pleated patterns 120, which are smoothly connected to each other, that is, the side surface 101 of the groove is entirely composed of the first pleated patterns 120. For example, along the direction from the transition region 12 to the first region 11, the surface of the first pleated pattern 120 has a wavy shape on a cross section perpendicular to the plane where the cover plate 100 is located. In this way, the surface area of ​​the side surface 101 can be greatly increased, which is beneficial to stress relief.

[0113] In other embodiments of this disclosure, such as Figure 9As shown, the side surface 101 of the groove includes a plurality of first sub-surfaces 121, which form a stepped shape. The plurality of first sub-surfaces 121 are arranged from near the first region 11 to far away from the first region 11. A first wrinkle pattern 120 is provided between the even-numbered first sub-surface 121 and the adjacent odd-numbered first sub-surface 121 with a larger value. The first wrinkle pattern 120 includes a depression. That is, the first sub-surface with the sequence number n and the first sub-surface with the sequence number (n+1) form a step, where n is an odd number and greater than or equal to 1. A first wrinkle pattern 120 is provided between the first sub-surface with the sequence number (n+1) and the first sub-surface with the sequence number (n+2). The first wrinkle pattern 120 located between the first sub-surface with the sequence number (n+1) and the first sub-surface with the sequence number (n+2) is a depression. For example, taking n=1, the serial numbers of the first sub-surfaces 121a, 121b, and 121c are 1, 2, and 3 respectively. These serial numbers form a step, and a first pleated pattern 120 is provided between each of the first sub-surfaces 121a, 121b, and 121c. For example, the first sub-surfaces 121a and 121b form a step TT of the step. This is equivalent to providing the first pleated pattern 120 at the inner corner of the step, so that the lateral stress generated when the cover plate 100 expands can be released.

[0114] For example, such as Figure 9 As shown, the first fold pattern 120 is located at the junction of two adjacent steps. The height difference between the (q+1)th step and the qth step is greater than the height difference between the (m+1)th step and the mth step. The depth of the depression between the (q+1)th step and the qth step is greater than the depth of the depression between the (m+1)th step and the mth step. q and m are positive integers greater than or equal to 1, and q and m are different, that is, if q and m. For example, taking q=1 as an example, the first (qth) step (which has zero height because it does not exist) is composed of the first sub-surfaces 121a and 121b, and its height is actually the height of the first (q+1)th step itself, that is, the height of the first sub-surface 121a (here, the first sub-surface 121b is parallel to the X-axis, so its height is ignored). Thus, if q is less than m, the farther away from the first zone 11, the smaller the step height and the shallower the depth of the first fold pattern 120 (recess); conversely, if q is greater than m, the farther away from the first zone 11, the greater the step height and the deeper the first fold pattern 120 (recess).

[0115] For example, such as Figure 9As shown, the first sub-surface with serial number n and the first sub-surface with serial number (n+1) are smoothly connected. For example, the first sub-surface with serial number n (for example, first sub-surface 121a if n=1) and the first sub-surface with serial number (n+1) (for example, first sub-surface 121b if n=1) are smoothly connected, and no first wrinkle pattern 120 is set between them. In this way, the risk of stress concentration at the connection between the first sub-surface 121a and the first sub-surface 121b can be reduced.

[0116] For example, such as Figure 9 As shown, there is at least one even-numbered first sub-surface 121, on which a first pleated pattern 120 is provided. The first pleated pattern 120 is either recessed or raised. For example, the first sub-surface 121b is an even-numbered first sub-surface 121. Therefore, the first sub-surface 121b is approximately planar and the direction of extension of the surface area is approximately parallel to the surface where the cover plate 100 is located. That is, the portion of the cover plate 100 corresponding to the first sub-surface 121b is prone to generating lateral stress (including stress transmitted from the first region 11) during expansion. The provision of the first pleated pattern 120 can facilitate the release of this lateral stress, thereby further reducing the risk of stress concentration in the cover plate 100.

[0117] In the embodiments of this disclosure, the arrangement of the first pleated pattern 120 can be designed according to the actual process requirements, wherein an exemplary arrangement is as follows.

[0118] In some embodiments of this disclosure, such as Figure 10A As shown, the orthographic projections of the first pleat patterns 120 on the two opposing side surfaces 101 of the groove onto the surface of the cover plate 100 are symmetrically distributed about the first region 11. Thus, when the cover plate 100 is folded or bent, the stress distribution in the transition region 12 will be relatively uniform (stress distribution and magnitude are essentially equal), thereby further reducing the risk of stress concentration. For example, on each side surface 101 of the groove, the orthographic projection of the first pleat pattern 120 onto the surface of the cover plate 100 is a strip, and the extending direction of the first pleat pattern 120 is perpendicular to the direction from the transition region 12 to the first region 11. For example, the orthographic projection of the first pleat pattern 120 onto the surface of the cover plate 100 can further be a straight line segment (its width is negligible).

[0119] In some embodiments of this disclosure, such as Figure 10A As shown, on the side surface 101 of each groove, a plurality of first pleated patterns 120 are arranged sequentially in a direction away from the first region 11, and each first pleated pattern 120 extends from one side edge of the cover plate 100 to the opposite side edge.

[0120] In other embodiments of this disclosure, such as Figure 10BAs shown, on the side surface 101 of each groove, a plurality of first pleated patterns 120 are arranged sequentially in a direction away from the first region 11. Each first pleated pattern 120 extends to one side edge of the cover plate 100 at only one end, and the edges of the cover plate 100 to which the ends of adjacent first pleated patterns 120 extend are located on opposite sides of the cover plate 100.

[0121] In other embodiments of this disclosure, such as Figure 10C As shown, on the side surface 101 of each groove, a plurality of first pleated patterns 120 are arranged sequentially in a direction away from the first region 11 and are classified as first pattern 120a, second pattern 120b and third pattern 120c. The first pattern 120a and the third pattern 120c are located on both sides of the second pattern 120b. The second pattern 120b extends from one side edge of the cover plate 100 to the opposite side edge. Only one end of the first pattern 120a and the third pattern 120c extends to one side edge of the cover plate 100, and the edges of the cover plate 100 to which the ends of the first pattern 120a and the third pattern 120c on both sides of the second pattern 120b extend are located on the opposite side of the cover plate 100.

[0122] In other embodiments of this disclosure, such as Figure 10D As shown, on the side surface 101 of each groove, the orthographic projection of multiple first pleated patterns 120 onto the surface of the cover plate 100 is arranged in multiple rows and columns. The direction of the columns is parallel to the direction from the transition area 12 to the first area 11, and the direction of the rows is perpendicular to the direction from the transition area 12 to the first area 11. That is, the first pleated patterns 120 are arranged in a matrix.

[0123] See again for at least one embodiment of this disclosure. Figure 7A and Figure 7C The cover plate 100 also includes at least one second region 13, which is located on the side of the transition region 12 away from the first region 11, and the thickness of the second region 13 is greater than the thickness of the transition region 12.

[0124] In at least one embodiment of this disclosure, such as Figure 7A and Figure 7CAs shown, there can be two second regions 13, located on opposite sides of the cover plate 100. The transition region 12 and the first region 11 are located between the two second regions 13, meaning there can also be two transition regions 12. The first region 11 and the second region 13 in the panel form a groove. On the side of the cover plate 100 with the groove, a first pleated pattern 120 is provided at the junction of the surface of the transition region 12 and the second region 13, and the surface of the first pleated pattern 120 at the junction with the second region 13 is smoothly connected to the surface of the second region 13. The second region 13 corresponds to the non-thinned area of ​​the cover plate 100. The thickness of the second region 13 can increase the strength of the edge of the cover plate 100 to protect the frame of the underlying structure, such as the display panel 20 described below.

[0125] In embodiments of this disclosure, a structure similar to the first sub-groove described above can be provided in the first region to release some stress, thereby reducing the stress transmitted from the first region to the transition region and reducing the risk of stress concentration in the cover plate.

[0126] In at least one embodiment of this disclosure, such as Figure 11A As shown, the bottom surface 102 of the groove includes at least one second pleated pattern 130. Along the direction from the transition zone 12 to the first zone 11, the surface of the second pleated pattern 130 has a curved shape on a cross-section perpendicular to the plane containing the cover plate 100. The second pleated pattern 130 allows the stress generated by the expansion of the first zone 11 to be gradually released in the transition zone 12 through the first pleated pattern 120, thereby reducing the risk of stress concentration at the junction of the transition zone 12 and the first zone 11, and within the transition zone 12 itself.

[0127] Optionally, the second pleat pattern includes recesses (such as...) Figure 11A (as shown) or protrusions (such as) Figure 11B (As shown).

[0128] In at least one embodiment of this disclosure, such as Figure 11A and Figure 11B As shown, the bottom surface 102 of the groove also includes at least two second sub-surfaces 131, which are distributed along the direction from the transition region 12 to the first region 11. The second pleated pattern 130 is located between at least two adjacent second sub-surfaces 131, and the surface of the second pleated pattern 130 is smoothly connected to the adjacent second sub-surfaces 131.

[0129] In at least one embodiment of this disclosure, such as Figures 12A to 12D As shown, the orthographic projection of the second pleated pattern 130 on the bottom surface 102 of the groove onto the surface of the cover plate 100 is symmetrically distributed about an axis of symmetry. The axis of symmetry passes through the centroid of the first region 11 and is perpendicular to the direction from the transition region 12 to the first region 11 (e.g., Figure 12A and Figure 12D(as shown); and / or, the orthographic projection of the second pleat pattern 130 of the bottom surface 102 of the groove onto the surface of the cover plate 100 is centrally symmetrical about the centroid of the bottom surface 102 (as shown). Figure 12B and Figure 12C (As shown). Thus, when the cover plate 100 is folded or bent, the stress distribution in the first zone 11 will be relatively uniform (the stress distribution and magnitude are basically equal), thereby further reducing the risk of stress concentration.

[0130] For example, such as Figures 12A to 12D As shown, the orthographic projection of the second pleated pattern 130 onto the surface of the cover plate 100 includes a strip, and the extension direction (Y-axis direction) of the second pleated pattern 130 is perpendicular to the direction (X-axis direction) from the transition region 12 to the first region 11. For example, the orthographic projection of the second pleated pattern 130 onto the surface of the cover plate 100 can further be a straight line segment (ignoring its width).

[0131] In the embodiments of this disclosure, the arrangement of the second pleated pattern 130 can be designed according to the actual process requirements, wherein an exemplary arrangement is as follows.

[0132] In some embodiments of this disclosure, such as Figure 12A As shown, the second pleated pattern 130 extends from one edge of the cover plate 100 to the opposite edge.

[0133] In other embodiments of this disclosure, such as Figure 12B As shown, the second pleated pattern 130 extends to one side edge of the cover plate 100 at only one end, and the edges of the cover plate 100 to which the ends of adjacent second pleated patterns 130 extend are located on opposite sides of the cover plate 100.

[0134] In other embodiments of this disclosure, such as Figure 12C As shown, the second pleated pattern 130 included in the cover plate 100 is classified into a fourth pattern 130a, a fifth pattern 130b, and a sixth pattern 130c. The fourth pattern 130a and the sixth pattern 130c are located on both sides of the fifth pattern 130b. The fifth pattern 130b extends from one side edge of the cover plate 100 to the opposite side edge. Only one end of the fourth pattern 130a and the sixth pattern 130c extends to one side edge of the cover plate 100, and the edges of the cover plate 100 to which the ends of the fourth pattern 130a and the sixth pattern 130c on both sides of the fifth pattern 130b extend are located on opposite sides of the cover plate 100.

[0135] In other embodiments of this disclosure, such as Figure 12DAs shown, the second pleated pattern 130 included in the cover plate 100 is arranged in multiple rows and columns on the surface of the cover plate 100. The direction of the columns is perpendicular to the direction from the transition area 12 to the first area 11 (e.g., the direction of the X-axis, which is perpendicular to the aforementioned axis of symmetry), and the direction of the rows is parallel to the direction from the transition area 12 to the first area 11 (e.g., the direction of the Y-axis, which is parallel to the aforementioned axis of symmetry).

[0136] It should be noted that, in the embodiments of this disclosure, when the cover plate includes only one transition zone, the specific design schemes for the side surface of the transition zone, the surface of the first zone, and whether a second zone is provided in the cover plate can refer to the relevant structures described above when the cover plate includes at least two transition zones, and will not be repeated here. For example, as Figure 13A As shown, the cover plate 100 has only one transition area 12, and the structure of the cover plate 100 can be referred to Figure 11A The structure of the cover plate 100 shown. For example, as... Figure 13B As shown, the cover plate 100 has only one transition area 12, and the structure of the cover plate 100 can be referred to Figure 9 The structure of the cover plate 100 shown.

[0137] At least one embodiment of this disclosure provides a cover plate including at least one transition region and at least one first region. The first region is adjacent to the transition region. On one side of the cover plate in the thickness direction, the transition region protrudes from the first region. At least one first sub-groove is provided at the boundary between the portion of the transition region protruding from the first region and the first region. The thickness of at least a portion of the cover plate located in the first sub-groove is less than the thickness of at least a portion of the cover plate located in the first region. The structure of this cover plate, the technical problem it solves, and further improvements can be found in the relevant descriptions in the foregoing embodiments, and will not be repeated here.

[0138] In at least one embodiment of this disclosure, the portion of the transition region protruding from the first region includes a side surface facing the first region, and the side surface is stepped. The structure of the cover plate, the technical problem it solves, and further improvements can be found in the foregoing embodiments (e.g., at least see...). Figure 9 The relevant descriptions in the illustrated embodiments will not be repeated here.

[0139] It should be noted that in the embodiments of this disclosure, the number of the first zone, transition zone, and second zone is not limited, and can be designed according to the specific scenario in which the cover plate is applied. For example, in some embodiments, the first zone, transition zone, and second zone can be configured as follows: Figure 13A and Figure 13B One of each is shown. For example, in some other embodiments, such as Figure 12D As shown, the first region 11 can be set to one, and the transition region 12 and the second region 13 can each be set to two. For example, in some other embodiments, such as Figure 14Aand Figure 14B As shown, the first zone 11 can be set to two, the transition zone 12 can be set to four, and the second zone 13 can be set to three.

[0140] At least one embodiment of this disclosure provides a display module, such as Figure 15 As shown, the display module may include the cover plate 100 in the above embodiment.

[0141] In at least one embodiment of this disclosure, such as Figure 15 As shown, the display module may further include a protective adhesive layer 200. The cover plate 100 and the protective adhesive layer 200 together form the cover plate assembly 10. The protective adhesive layer 200 covers the outer peripheral surface 100b of the cover plate 100 and the surface 100a of the side with the groove. The portion of the protective adhesive layer 200 covering the groove has a planarized surface. The protective adhesive layer 200 can be an optical adhesive, which not only planarizes the surface 100a of the cover plate 100 with the groove, but also possesses a certain strength after curing to protect the cover plate 100.

[0142] In at least one embodiment of this disclosure, such as Figure 15 As shown, the cover assembly 10 of the display module also includes a protective film 300, which is located on the side of the cover 100 away from the protective adhesive layer 200. For example, the protective film 300 can be made of materials such as PET (polyethylene terephthalate) to enable the cover assembly 10 to have functions such as impact resistance and scratch resistance.

[0143] In at least one embodiment of this disclosure, such as Figure 15 As shown, the cover plate assembly 10 of the display module also includes an adhesive layer 400, which is located between the cover plate 100 and the protective film 300 to adhere the cover plate 100 and the protective film 300.

[0144] In at least one embodiment of this disclosure, such as Figure 15 As shown, the cover plate assembly 10 of the display module also includes a light-shielding structure 500, which is located on the surface of the protective film 300 facing the cover plate 100 and covers the edge of the protective film 300. For example, the light-shielding structure 500 can be made of a material such as ink.

[0145] In at least one embodiment of this disclosure, such as Figure 16 As shown, the display module may further include a display panel 20, which is located on the side of the cover plate 100 included in the cover plate assembly 10 that has a groove. For example, the display panel 20 may be a foldable or bendable display panel, which requires the cover plate assembly 10 to also have foldable or bendable properties, thus requiring the relevant design solutions in the foregoing embodiments of this disclosure.

[0146] The display module can be used in any product or component with a display function, such as a TV, digital camera, mobile phone, watch, tablet computer, laptop computer, or navigator. For example, the display module can be used in products such as foldable phones and tablets.

[0147] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0148] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

[0149] The above description is merely a preferred embodiment of this specification and is not intended to limit this specification. Any modifications or equivalent substitutions made within the spirit and principles of this specification should be included within the scope of protection of this specification.

Claims

1. A cover plate, characterized in that, It includes at least one transition region and at least one first region, wherein the first region is adjacent to the transition region, and the thickness of the first region is less than the thickness of the transition region, such that the transition region has a side surface facing the first region on one side of the cover plate. On one side of the cover plate, at the junction of the side surface of the transition zone and the surface of the first zone, at least one first sub-groove is provided, the thickness of at least the portion of the cover plate located in the first sub-groove is less than the thickness of at least the portion of the cover plate located in the first zone, and The side surface of the transition zone includes at least one first fold pattern, and the surface of the first zone includes at least one second fold pattern.

2. The cover plate according to claim 1, characterized in that, The cover plate includes only one of the aforementioned transition zones; or The cover plate includes at least two transition zones, with the first zone located between adjacent transition zones. On one side of the cover plate, the surfaces of the transition zones and the first zone form a groove, the side surface of the transition zone forms the side surface of the groove, and the surface of the first zone forms the bottom surface of the groove.

3. The cover plate according to claim 1, characterized in that, The surface of the first sub-groove includes a smooth surface.

4. The cover plate according to claim 3, characterized in that, On the side of the cover plate where the first sub-groove is provided, the surface of the first sub-groove is smoothly in contact with the surface of the cover plate located in the first region, and / or, the surface of the first sub-groove is smoothly in contact with the surface of the cover plate located in the transition region.

5. The cover plate according to claim 3, characterized in that, Along the direction from the transition zone to the first zone, the first sub-groove has an arc-shaped pattern on the cross-section of the cover plate, and the cross-section of the cover plate is perpendicular to the surface on which the cover plate is located; or Along the direction from the transition zone to the first zone, the pattern of the first sub-groove on the cross-section of the cover plate includes a wavy shape, and the cross-section of the cover plate is perpendicular to the surface on which the cover plate is located.

6. The cover plate according to claim 1, characterized in that, The orthographic projection of the first sub-groove onto the surface of the cover plate comprises a strip shape, and the extending direction of the first sub-groove is perpendicular to the direction from the transition area to the first area.

7. The cover plate according to claim 3, characterized in that, A first sub-groove is provided at the junction of the side surface of the transition zone and the surface of the first zone, the first sub-groove extending from one edge of the cover plate to the opposite edge; or A first sub-groove is provided at the junction of the side surface of the transition zone and the surface of the first zone, and only one end of the first sub-groove extends to the edge of the cover plate; or At the junction of the side surface of the transition zone and the surface of the first zone, a plurality of first sub-grooves spaced apart from each other are provided, and the first sub-grooves are arranged sequentially along a direction perpendicular to the direction from the transition zone to the first zone.

8. The cover plate according to claim 7, characterized in that, In the case where at least two transition zones are provided, the first zone is located between adjacent transition zones, and the first sub-grooves provided at the junction of the two opposite side surfaces of the transition zones on both sides of the first zone and the surface of the first zone are symmetrically distributed about the first zone in their orthographic projection on the surface where the cover plate is located.

9. The cover plate according to claim 1, characterized in that, The depth of the first sub-groove is greater than or equal to 5 micrometers.

10. The cover plate according to any one of claims 1 to 9, characterized in that, Along the direction from the transition zone to the first zone, the surface of the first pleated pattern has a curved shape on a cross section perpendicular to the plane where the cover plate is located.

11. The cover plate according to claim 10, characterized in that, The first wrinkle pattern includes depressions and / or protrusions.

12. The cover plate according to claim 10, characterized in that, The side surface of the transition zone includes a plurality of the first fold patterns, which are smoothly connected to each other.

13. The cover plate according to claim 12, characterized in that, Along the direction from the transition zone to the first zone, the surface of the first pleated pattern has a wavy shape on a cross section perpendicular to the plane where the cover plate is located.

14. The cover plate according to claim 10, characterized in that, The side surface of the transition zone further includes at least two first sub-surfaces, the first fold pattern being located between at least two adjacent first sub-surfaces, and the surface of the first fold pattern being smoothly connected to the adjacent first sub-surfaces.

15. The cover plate according to claim 14, characterized in that, The side surface of the transition zone includes multiple first sub-surfaces, which form a stepped shape. These first sub-surfaces are ordered from closest to the first zone to furthest from it. The first sub-surface with sequence number n and the first sub-surface with sequence number (n+1) form a step, where n is an odd number and greater than or equal to 1. The first wrinkle pattern is provided between the first sub-surface with serial number (n+1) and the first sub-surface with serial number (n+2), and the first wrinkle pattern located between the first sub-surface with serial number (n+1) and the first sub-surface with serial number (n+2) includes a depression.

16. The cover plate according to claim 15, characterized in that, The first fold pattern is located at the junction of two adjacent steps. The height difference between the (q+1)th step and the qth step is greater than the height difference between the (m+1)th step and the mth step. The depth of the depression between the (q+1)th step and the qth step is greater than the depth of the depression between the (m+1)th step and the mth step. q and m are positive integers greater than or equal to 1, and q and m are different.

17. The cover plate according to claim 15, characterized in that, The first sub-surface with serial number n is smoothly connected to the first sub-surface with serial number (n+1).

18. The cover plate according to claim 10, characterized in that, In the case where at least two transition zones are provided, the first zone is located between adjacent transition zones, and the first fold pattern on the two opposite side surfaces of the transition zones on both sides of the first zone is symmetrically distributed about the first zone, as an orthographic projection of the cover plate onto the surface.

19. The cover plate according to claim 10, characterized in that, On the side surface of each transition zone, the orthographic projection of the first pleated pattern onto the surface where the cover plate is located comprises stripes, and the extension direction of the first pleated pattern is perpendicular to the direction from the transition zone to the first zone.

20. The cover plate according to claim 19, characterized in that, On the side surface of each transition zone, a plurality of the first pleated patterns are arranged sequentially in a direction away from the first zone, and each of the first pleated patterns extends from one edge of the cover plate to the opposite edge; or On the side surface of each transition zone, a plurality of first pleated patterns are arranged sequentially in a direction away from the first zone. Each first pleated pattern extends only one end to one edge of the cover plate, and the edges of the cover plate to which the ends of adjacent first pleated patterns extend are located on opposite sides of the cover plate; or On the side surface of each transition zone, a plurality of the first pleated patterns are arranged sequentially in a direction away from the first zone and are classified as a first pattern, a second pattern, and a third pattern. The first pattern and the third pattern are located on both sides of the second pattern. The second pattern extends from one side edge of the cover plate to the opposite side edge. Only one end of the first pattern and the third pattern extends to one side edge of the cover plate, and the edges of the cover plate to which the ends of the first pattern and the third pattern on both sides of the second pattern extend are located on opposite sides of the cover plate; or On the side surface of each transition zone, the orthographic projections of multiple first pleated patterns onto the surface of the cover plate are arranged in multiple rows and columns, with the column direction parallel to the direction from the transition zone to the first zone and the row direction perpendicular to the direction from the transition zone to the first zone.

21. The cover plate according to claim 1, characterized in that, It also includes at least one second region, wherein the second region is adjacent to the transition region and the thickness of the second region is greater than the thickness of the transition region.

22. The cover plate according to claim 21, characterized in that, The at least one second zone includes two second zones located on opposite sides of the cover plate, and the transition zone and the first zone are located between the two second zones.

23. The cover plate according to claim 1, characterized in that, Along the direction from the transition zone to the first zone, the surface of the second pleated pattern has a curved shape on a cross section perpendicular to the plane where the cover plate is located.

24. The cover plate according to claim 23, characterized in that, The second pleated pattern includes depressions and / or protrusions.

25. The cover plate according to claim 23, characterized in that, The surface of the first region further includes at least two second sub-surfaces, which are distributed along the direction from the transition region to the first region. The second fold pattern is located between at least two adjacent second sub-surfaces, and the surface of the second fold pattern is smoothly connected to the adjacent second sub-surfaces.

26. The cover plate according to claim 23, characterized in that, The orthographic projection of the second pleated pattern onto the surface of the cover plate includes stripes, and the extension direction of the second pleated pattern is perpendicular to the direction from the transition area to the first area.

27. The cover plate according to claim 26, characterized in that, Each of the second pleats extends from one edge of the cover plate to the opposite edge; or Each of the second pleated patterns extends only one end to one edge of the cover plate, and the edges of the cover plate to which the ends of adjacent second pleated patterns extend are located on opposite sides of the cover plate; or The plurality of second pleated patterns are classified into a fourth pattern, a fifth pattern, and a sixth pattern. The fourth and sixth patterns are located on either side of the fifth pattern. The fifth pattern extends from one edge of the cover plate to the opposite edge. Only one end of the fourth and sixth patterns extends to one edge of the cover plate, and the edges of the cover plate to which the ends of the fourth and sixth patterns on either side of the fifth pattern extend are located on opposite sides of the cover plate; or The orthographic projections of multiple second fold patterns on the surface of the cover plate are arranged in multiple rows and columns, with the column direction perpendicular to the direction from the transition area to the first area and the row direction parallel to the direction from the transition area to the first area.

28. A cover plate, characterized in that, It includes at least one transition zone and at least one first zone, the first zone being adjacent to the transition zone. On one side of the cover plate in the thickness direction, the transition zone protrudes from the first zone. At least one first sub-groove is provided at the junction of the portion of the transition zone protruding from the first zone and the first zone. The thickness of at least a portion of the cover plate located in the first sub-groove is less than the thickness of at least a portion of the cover plate located in the first zone.

29. The cover plate according to claim 28, characterized in that, The portion of the transition region that protrudes from the first region includes a side surface facing the first region, and the side surface includes a stepped shape.

30. A display module, characterized in that, The cover plate included in any one of claims 1 to 19.

31. The display module according to claim 30, characterized in that, It also includes a protective adhesive layer, wherein the protective adhesive layer covers the outer peripheral surface of the cover plate and one side surface of the side surface where the transition area is provided, and the protective adhesive layer is a planarization film layer.

32. The cover plate according to claim 31, characterized in that, The display module also includes a protective film located on the side of the cover plate away from the protective adhesive layer.

33. The cover plate according to claim 32, characterized in that, The display module also includes an adhesive layer, which is located between the cover plate and the protective film.

34. The cover plate according to claim 32, characterized in that, The display module also includes a light-shielding structure located on the surface of the protective film facing the cover plate and covering the edge of the protective film.

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