Cover plate and display module

Abstract

The invention provides a cover plate, a cover plate assembly and a display module, the cover plate comprises at least one transition area and at least one first area, the first area is adjacent to the transition area, and the thickness of the first area is smaller than that of the transition area, so that the transition area is provided with a side surface facing the first area on one side of the cover plate. At least one first sub-groove is formed in the junction of the side surface of the transition area and the surface of the first area on one side of the cover plate, and the thickness of at least one part, located in the first sub-groove, of the cover plate is smaller than that of at least one part, located in the first area, of the cover plate. According to the cover plate, the first sub-groove can partially release transverse stress caused by swelling capacity in the tempering process of the first area, so that stress concentrated at the junction of the first area and the transition area is reduced, the problem that the first area or the transition area is wrinkled due to tempering swelling capacity difference is avoided or relieved, and the yield and the reliability of the cover plate are further improved.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular, to a cover plate and a display module. Background Art

[0002] As existing flexible displays are mainly made of organic materials, folding or curved displays have serious creases. In recent years, in order to improve impact resistance and ensure bending performance, various manufacturers have also developed cover plates of varying thicknesses. However, the effect is not good. Summary of the invention

[0003] According to a first aspect of the present disclosure, a cover plate is provided, the cover plate comprising at least one transition zone and at least one first zone, the first zone being adjacent to the transition zone, the thickness of the first zone being smaller than the thickness of the transition zone, so that the transition zone has a side surface facing the first zone 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 zone and the surface of the first zone on one side of the cover plate, and the thickness of at least a portion of the cover plate located in the first sub-groove is smaller than the thickness of at least a portion of the cover plate located in the first zone.

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

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

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

[0007] In a specific embodiment of the first aspect of the present disclosure, the surface of the first sub-groove includes a smooth surface, so that the stress can be dispersed on the surface of the first sub-groove, thereby reducing the risk of stress concentration in the first sub-groove.

[0008] In a specific embodiment of the first aspect of the present disclosure, on the side of the cover plate where the first sub-groove is provided, the surface of the first sub-groove is smoothly connected to the surface of the cover plate located in the first zone, and / or the surface of the first sub-groove is smoothly connected to the surface of the cover plate located in the transition zone. In this way, the risk of stress concentration around the location of the first sub-groove can be reduced.

[0009] In a specific embodiment of the first aspect of the present disclosure, 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 an arc, and the cross section of the cover plate is perpendicular to the surface where the cover plate is located.

[0010] In another specific embodiment of the first aspect of the present disclosure, 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 wave shape, and the cross section of the cover plate is perpendicular to the surface where the cover plate is located.

[0011] In a specific embodiment of the first aspect of the present disclosure, the orthographic projection of the first sub-groove on 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 zone to the first zone.

[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, and the first sub-groove extends from one side edge of the cover plate to the other 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, and only one end of the first sub-groove extends 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 in sequence along a direction perpendicular to the direction from the transition zone to the first zone.

[0015] Optionally, 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 are respectively provided at the junctions between two opposite side surfaces on both sides of the first zone and the surface of the first zone, and the orthographic projections on the surface where the cover plate is located are 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 (stress distribution and magnitude are substantially equal), thereby further reducing the risk of stress concentration.

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

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

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

[0019] In a specific embodiment of the first aspect of the present disclosure, the first wrinkle pattern includes depressions or protrusions.

[0020] In a specific embodiment of the first aspect of the present disclosure, the side surface of the transition zone includes a plurality of first fold patterns, and the first fold patterns are smoothly connected to each other.

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

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

[0023] In a specific embodiment of the first aspect of the present disclosure, the side surface of the transition zone includes a plurality of first sub-surfaces, the plurality of first sub-surfaces form a step type, the plurality of first sub-surfaces are arranged from close to the first zone to far from the first zone, the first sub-surface with a serial number of n and the first sub-surface with a serial number of (n+1) form a step, n is an odd number and is greater than or equal to 1, a first fold pattern is arranged between the first sub-surface with a serial number of (n+1) and the first sub-surface with a serial number of (n+2), and the first fold pattern located between the first sub-surface with a serial number of (n+1) and the first sub-surface with a serial number of (n+2) includes a depression. In this way, it is equivalent to arranging the 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 wrinkle 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 respectively positive integers greater than or equal to 1, and q and m are different.

[0025] Optionally, the first sub-surface with a serial number of n is smoothly connected to the first sub-surface with a serial number of (n+1), so that the risk of stress concentration at the connection between the two first sub-surfaces can be reduced.

[0026] In a specific embodiment of the first aspect of the present 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 wrinkle patterns on two opposite side surfaces of the transition zones on both sides of the first zone on the surface where the cover plate is located are symmetrically distributed about the first zone. In this way, when the cover plate is folded or bent, the stress distribution in the transition zone will be relatively uniform (stress distribution and magnitude are substantially equal), thereby further reducing the risk of stress concentration.

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

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

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

[0030] In another specific embodiment of the first aspect of the present disclosure, on the side surface of each transition zone, a plurality of first pleat patterns are arranged in sequence in a direction away from the first zone and are classified into 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 other 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 the present disclosure, on the side surface of each transition zone, the orthographic projections of multiple first pleat patterns on the surface where the cover plate is located are arranged into multiple rows and columns, the direction of the columns is parallel to the direction from the transition zone to the first zone, and the direction of the rows is perpendicular to the direction from the transition zone to the first zone.

[0032] In a specific embodiment of the first aspect of the present disclosure, the cover plate further includes at least one second region, 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. The thickness of the second region can increase the strength of the edge of the cover plate to protect the underlying structure, such as the frame of the display panel described below.

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

[0034] In a specific embodiment of the first aspect of the present disclosure, the surface of the first zone includes at least one second fold pattern, and along the direction from the transition zone to the first zone, the surface of the second fold pattern includes a curved shape in a cross section perpendicular to the surface where the cover plate is located. The second fold pattern can make the stress generated by the expansion of the first zone gradually released in the transition zone through the first fold pattern, thereby reducing the risk of stress concentration at the junction of the transition zone and the first zone and in the transition zone.

[0035] Optionally, the second corrugation pattern comprises depressions or protrusions.

[0036] In a specific embodiment of the first aspect of the present disclosure, the surface of the first zone also includes at least two second sub-surfaces, which are distributed along the direction from the transition zone to the first zone, and 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.

[0037] In a specific embodiment of the first aspect of the present disclosure, the orthographic projection of the second wrinkle pattern on the surface of the first zone on the surface where the cover plate is located is symmetrically distributed about the symmetry axis, the symmetry axis passes through the centroid of the first zone and is perpendicular to the direction from the transition zone to the first zone; and / or, the orthographic projection of the second wrinkle pattern on the surface of the first zone on the surface where the cover plate is located is centrally symmetrically distributed about the centroid of the surface of the first zone. In this way, when the cover plate is folded or bent, the stress distribution in the first zone will be relatively uniform (stress distribution and magnitude are basically equal), thereby further reducing the risk of stress concentration.

[0038] In a specific embodiment of the first aspect of the present disclosure, the orthographic projection of the second fold pattern on the surface where the cover plate is located includes strips, and the extension direction of the second fold pattern is perpendicular to the direction from the transition area to the first area.

[0039] In a specific embodiment of the first aspect of the present disclosure, each second fold pattern extends from one side edge of the cover plate to another opposite side edge.

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

[0041] In another specific embodiment of the first aspect of the present disclosure, multiple second pleat patterns are classified into a fourth pattern, a fifth pattern and a sixth pattern, the fourth pattern and the sixth pattern are located on both sides of the fifth pattern, the fifth pattern extends from one side edge of the cover plate to the other opposite side edge, only one end of the fourth pattern and the sixth pattern extends 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 the present disclosure, the orthographic projections of the plurality of second pleat patterns on the surface of the cover plate are arranged into multiple rows and columns, the direction of the columns is perpendicular to the direction from the transition zone to the first zone (perpendicular to the above-mentioned axis of symmetry), and the direction of the rows is parallel to the direction from the transition zone to the first zone (parallel to the above-mentioned axis of symmetry).

[0043] A second aspect of the present disclosure provides a cover plate, which includes at least one transition zone and at least one first zone, the first zone being adjacent to the transition zone, and the transition zone protruding from the first zone on one side in the thickness direction of the cover plate, and at least one first sub-groove is provided at the junction of a portion of the transition zone protruding from the first zone and the first zone, and 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.

[0044] In another specific embodiment of the second aspect of the present disclosure, the portion of the transition zone protruding from the first zone includes a side surface facing the first zone, and the side surface includes a step shape.

[0045] A third aspect of the present disclosure provides a display module, which includes the cover plate in the first aspect or the second aspect.

[0046] In a specific embodiment of the second aspect of the present disclosure, the display module may further include a protective adhesive layer, which covers the outer peripheral surface of the cover plate and a side surface of the side surface provided with the transition zone, and the protective adhesive layer is a planarization film layer.

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

[0048] Optionally, the display module further includes a bonding adhesive layer, and the bonding adhesive layer is located between the cover plate and the protective film.

[0049] Optionally, the display module further includes a shading structure, which is located on the surface of the protective film facing the cover plate and covers the edge of the protective film. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A schematic diagram of a planar structure of a cover plate under a certain design is provided in one embodiment of the present disclosure.

[0051] Figure 2for Figure 1 The cover plate is shown in cross-section along M1-N1.

[0052] Figure 3A for Figure 2 An enlarged view of the S1 region of the cover plate is shown in one embodiment.

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

[0054] Figure 4A A schematic diagram of the planar structure of a cover plate provided in another design according to an embodiment of the present disclosure.

[0055] Figure 4B for Figure 4A The cover plate is shown in cross-section along M2-N2.

[0056] Figure 5A A schematic diagram of the planar structure of a cover plate provided in another design according to an embodiment of the present disclosure.

[0057] Figure 5B A schematic diagram of the planar structure of a cover plate provided in another design according to an embodiment of the present disclosure.

[0058] Fig. 6A A cross-sectional view of a cover plate provided in another design according to an embodiment of the present disclosure.

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

[0060] Fig. 7A A cross-sectional view of a cover plate provided in another design according to an embodiment of the present disclosure.

[0061] Figure 7B for Fig. 7A A magnified view of the S3 region of the cover plate is shown.

[0062] Figure 7C for Fig. 7A A magnified view of the S4 region of the cover plate is shown.

[0063] Figure 8 A cross-sectional view of a cover plate provided in another design according to an embodiment of the present disclosure.

[0064] Fig. 9 A cross-sectional view of a cover plate provided in another design according to an embodiment of the present disclosure.

[0065] Fig. 10A A schematic diagram of the planar structure of a cover plate provided in another design according to an embodiment of the present disclosure.

[0066] Fig. 10B A schematic diagram of the planar structure of a cover plate provided in another design according to an embodiment of the present disclosure.

[0067] Fig. 10C A schematic diagram of the planar structure of a cover plate provided in another design according to an embodiment of the present disclosure.

[0068] Fig. 10D A schematic diagram of the planar structure of a cover plate provided in another design according to an embodiment of the present disclosure.

[0069] Fig.11A A cross-sectional view of a cover plate provided in another design according to an embodiment of the present disclosure.

[0070] Fig. 11B A cross-sectional view of a cover plate provided in another design according to an embodiment of the present disclosure.

[0071] Fig. 12A A schematic diagram of the planar structure of a cover plate provided in another design according to an embodiment of the present disclosure.

[0072] Fig. 12B A schematic diagram of the planar structure of a cover plate provided in another design according to an embodiment of the present disclosure.

[0073] Fig. 12C A schematic diagram of the planar structure of a cover plate provided in another design according to an embodiment of the present disclosure.

[0074] Fig.12D A schematic diagram of the planar structure of a cover plate provided in another design according to an embodiment of the present disclosure.

[0075] Fig.13A A cross-sectional view of a cover plate provided in another design according to an embodiment of the present disclosure.

[0076] Fig. 13B A cross-sectional view of a cover plate provided in another design according to an embodiment of the present disclosure.

[0077] Fig.14A A schematic diagram of the planar structure of a cover plate provided in another design according to an embodiment of the present disclosure.

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

[0079] Fig.15 A schematic structural diagram of a cover plate assembly provided in one embodiment of the present disclosure.

[0080] Fig.16A schematic diagram of the structure of a display module provided by one embodiment of the present disclosure.

[0081] Description of reference numerals:

[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 fold pattern; 120a-first pattern; 120b-second pattern; 120c-third pattern; 121-first sub-surface; 130-second fold pattern; 130a-fourth pattern; 130b-fifth pattern; 130c-sixth pattern; 131-second sub-surface;

[0084] 200-protective adhesive layer; 300-protective film; 400-bonding adhesive layer; 500-light-shielding structure. DETAILED DESCRIPTION

[0085] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this specification.

[0086] The present disclosure provides a cover plate and a display module to at least solve the problem of stress concentration caused by uneven thickness of the cover plate. The cover plate includes at least one transition zone and at least one first zone, the first zone is adjacent to the transition zone, and the thickness of the first zone is less than the thickness of the transition zone, so that the transition zone has a side surface facing the first zone 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 zone and the surface of the first zone, and 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. The cover plate needs to be tempered to improve its bending performance. In order to improve the bending performance of the cover plate, part of the first zone of the cover plate will be thinned, which results in a thickness difference between the first zone and the transition zone. In the tempering process at the junction of the first zone and the transition zone, the thickness difference may cause stress concentration due to expansion, thereby causing the cover plate to be damaged, or it may be easily damaged due to excessive stress concentration during subsequent use. In the above scheme, the first sub-groove can partially release the lateral stress (extending from the first zone to the transition zone) caused by the expansion of the first zone during the tempering process, thereby reducing the stress concentrated at the junction of the first zone and the transition zone, so as to avoid or alleviate the wrinkle problem in the groove area or transition zone 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 the display module in at least one embodiment of the present disclosure is described in detail below in conjunction with the accompanying drawings. In addition, in these drawings, a spatial rectangular coordinate system is established with the surface of the cover plate (e.g., the flat main surface of one side thereof) as a reference to more intuitively present the positional relationship of the relevant structures in the cover plate, and in this spatial rectangular coordinate system, the X-axis and the 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. Figure 2 The surface of the transition zone 12 and the first zone 11 constitutes a groove, which is surrounded by two side surfaces 101 and a bottom surface 102. The surface of the transition zone 12 constitutes the side surface 101 of the transition zone 12, and the surface of the first zone 11 constitutes the bottom surface 102 of the groove. The side surface 101 is the surface of the transition zone 12 facing the groove, so it can be considered to be facing the first zone 11. At least one first sub-groove 110 ( Figure 1 ), the thickness of at least a portion of the cover plate 100 located in the first sub-groove 110 is less than the thickness of at least a portion of the cover plate 100 located in the first zone 11. For example, the first zone 11 is equivalent to the thinning zone of the cover plate 100, and the thickness of the transition zone 12 is greater than the thickness of the first zone 11 except for the junction area with the first zone 11. For example, in the direction away from the first zone 11 (for example, the direction parallel to the X-axis), the thickness of the transition zone 12 generally shows an increasing trend. The cover plate 100 needs to be tempered to improve its bending performance. Because of the setting of the groove, the first zone 11 is actually equivalent to thinning relative to the transition zone 12. Due to the difference in thickness between the first zone 11 and the transition zone 12, stress concentration may be generated at the junction of the first zone 11 and the transition zone 12 during the tempering process due to expansion, thereby causing the cover plate 100 to be damaged, or it may be easily damaged due to excessive stress concentration during subsequent use. In an embodiment of the present disclosure, the first sub-groove 110 can partially release the lateral stress (extending from the first zone 11 to the transition zone 12, parallel to the direction of the X-axis) generated in the first zone 11 during the expansion process, thereby reducing the stress concentrated in the first zone 11 and the transition zone 12, so as to improve the yield and reliability of the cover plate 100.

[0089] It should be noted that in the embodiments of the present disclosure, there is no limitation on the number of first zones and transition zones, and they can be specifically designed according to the application scenarios of the cover plate.

[0090] In another specific embodiment of the first aspect of the present disclosure, the cover plate includes at least two transition zones, the first zone is located between adjacent transition zones, and on one side of the cover plate, the surfaces of the transition zone and the first zone constitute a groove, the side surface of the transition zone constitutes the side surface of the groove, and the surface of the first zone constitutes the bottom surface of the groove. The case where two transition zones are provided can be referred to as Figures 1 to 3A Related descriptions in the illustrated embodiments.

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

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

[0093] In addition, in the following embodiments, when the cover plate includes at least two transition zones to form a groove, the side surface of the transition zone can participate in constituting the side surface of the groove, and therefore, the side surface of the transition zone also refers to the side surface of the groove, and accordingly, the surface of the first zone also refers to the bottom surface of the groove.

[0094] In at least one embodiment of the present disclosure, it is possible to refer to Figure 3A The surface of the first sub-groove 110 includes a smooth surface. In this way, the stress can 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] In at least one embodiment of the present disclosure, it is possible to refer to 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 is smoothly connected to the surface of the cover plate 100 located in the first area 11, and the surface of the first sub-groove 110 is smoothly connected to the surface of the cover plate 100 located in the transition area 12. In this way, no sharp angle structure will appear at the edge of the first sub-groove 110, and the stress can still be dispersed and released at this position, thereby reducing the risk of stress concentration around the position where the first sub-groove 110 is located.

[0096] In some embodiments of the present disclosure, it can be referred to again Figure 3AThe pattern of the first sub-groove 110 on the cross section of the cover plate 100 includes an arc, and the cross section of the cover plate 100 is perpendicular to the surface where 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 disperse the stress evenly to reduce the risk of stress concentration.

[0097] For example, the arc shape may be a circular arc shape (an arc of a perfect circle), an elliptical arc shape, or the like.

[0098] In other embodiments of the present disclosure, 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 wave shape, and the cross section of the cover plate 100 is perpendicular to the surface where 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 a wave-shaped cross section can make the stress evenly dispersed to reduce the risk of stress concentration. For example, in Figure 3B On the basis of the structure shown, the cross section of the first sub-groove 110 can be further designed to be roughly arc-shaped, thereby taking into account the advantages of both the arc shape and the wave shape 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 the present disclosure, Figure 1 As shown, the orthographic projection of the first sub-groove 110 on 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 embodiment of the present disclosure, the arrangement of the first sub-grooves 110 may be designed according to actual process requirements, wherein an exemplary arrangement is as follows.

[0102] In one example, if 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, and the first sub-groove 110 extends from one side edge of the cover plate 100 to the other opposite side edge.

[0103] In another example, 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, and only one end of the first sub-groove 110 extends to the edge of the cover plate 100 .

[0104] In another example, 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 extend in a direction from the transition zone 12 to the first zone 11 ( Figure 5B The direction perpendicular to the X-axis in the Figure 5B The directions of the Y-axis in the figure are arranged in sequence.

[0105] In at least one embodiment of the present disclosure, Figure 1 , Figure 5A and Figure 5B , the first sub-grooves 110 are respectively arranged at the junction of the two opposite side surfaces 101 and the bottom surface 102 of the groove, and the orthographic projections on the surface where the cover plate 100 is located are symmetrically distributed about the first area 11. For example, the symmetry axis YY used to represent the symmetric distribution can pass through the centroid O1 of the first area 11, and the extension direction of the symmetry axis YY is perpendicular to the direction from the transition area 12 to the first area 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 area 11 will be relatively uniform (the stress distribution and magnitude are basically equal), thereby further reducing the risk of stress concentration.

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

[0107] In the embodiment of the present disclosure, the stress generated in the first zone will be transferred to the transition zone, and a certain stress will also be generated when the transition zone expands. Therefore, a structure similar to the above-mentioned first sub-groove can be provided in the transition zone to release the stress.

[0108] For example, Fig. 6A and Figure 6B As shown, the side surface 101 of the groove (corresponding to the transition zone 12) includes at least one first fold pattern 120, and along the direction from the transition zone 12 to the first zone 11, the surface of the first fold pattern 120 in the cross section perpendicular to the surface where the cover plate 100 is located includes a curved shape. In this way, the first fold pattern 120 can gradually release the stress generated by the expansion of the first zone 11 and the transition zone 12 in the transition zone 12 through the first fold pattern 120, thereby reducing the risk of stress concentration at the junction of the transition zone 12 and the first zone 11 and in the transition zone 12.

[0109] In at least one embodiment of the present disclosure, the first wrinkle pattern 120 includes a depression (such as Fig. 6A and Figure 6Bas shown) or raised (as Fig. 7A and Figure 7B As shown in FIG. 1 , the first fold pattern 120 is equivalent to increasing the surface area of ​​the side surface 101 of the groove, so as to be more conducive to the stress dispersion and release at the side surface 101, thereby reducing the risk of stress concentration on the cover plate.

[0110] In the case where the first wrinkle pattern 120 is provided on the side surface 101, the specific type of the first wrinkle pattern 120 and the area ratio of the first wrinkle pattern 120 in the side surface 101 are not limited in the embodiments of the present disclosure and can be designed according to the requirements of the actual process.

[0111] In some embodiments of the present disclosure, Fig. 6A or Fig. 7A As shown, the side surface 101 of the groove further includes at least two first sub-surfaces 121, the first fold pattern 120 is located between at least two adjacent first sub-surfaces 121, and the surface of the first fold 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 and is not perpendicular, that is, the first sub-surface 121 is an inclined surface.

[0112] In other embodiments of the present disclosure, Figure 8 As shown, the side surface 101 of the groove includes a plurality of first fold patterns 120, and the first fold patterns 120 are smoothly connected to each other, that is, the side surface 101 of the groove is completely composed of the first fold patterns 120. For example, along the direction from the transition area 12 to the first area 11, the surface of the first fold pattern 120 is wavy in the cross section perpendicular to the surface where the cover plate 100 is located. In this way, the surface area of ​​the side surface 101 can be greatly increased, which is conducive to the release of stress.

[0113] In other embodiments of the present disclosure, Fig. 9As shown, the side surface 101 of the groove includes a plurality of first sub-surfaces 121, and the plurality of first sub-surfaces 121 form a stepped shape. The plurality of first sub-surfaces 121 are arranged from close to the first area 11 to far away from the first area 11, and a first wrinkle pattern 120 is arranged between the first sub-surface 121 with an even serial number and the adjacent first sub-surface 121 with an odd serial number and a larger numerical value, and the first wrinkle pattern 120 includes a depression, that is, the first sub-surface with a serial number n and the first sub-surface with a serial number (n+1) form a step, n is an odd number and greater than or equal to 1, and a first wrinkle pattern 120 is arranged between the first sub-surface with a serial number (n+1) and the first sub-surface with a serial number (n+2), and the first wrinkle pattern 120 located between the first sub-surface with a serial number (n+1) and the first sub-surface with a serial number (n+2) is a depression. For example, taking n=1 as an example, the serial numbers of the first sub-surfaces 121a, 121b and 121c are 1, 2 and 3 respectively, and the serial numbers of the first sub-surfaces 121a, 121b and 121c are 1, 2 and 3 respectively to form a step, and the first fold pattern 120 is arranged between the first sub-surfaces 121a, 121b and 121c. For example, the first sub-surfaces 121a and 121b constitute a step TT of the step. In this way, it is equivalent to arranging the first fold 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, Fig. 9 As shown, the first wrinkle 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 does not exist and has a height of zero) is composed of the first sub-surfaces 121a and 121b, and its height is actually the height of the first (q+1th) step itself, that is, the height of the first sub-surface 121a (here, the first sub-surface 121b is parallel to the X-axis and its height is ignored). In this way, if q is less than m, the farther away from the first zone 11, the smaller the step height, and the smaller the depth of the first wrinkle pattern 120 (recess); on the contrary, if q is greater than m, the farther away from the first zone 11, the larger the step height, and the larger the depth of the first wrinkle pattern 120 (recess).

[0115] For example, Fig. 9As shown, the first sub-surface with serial number n is smoothly connected with the first sub-surface with serial number (n+1), for example, the first sub-surface with serial number n (for example, n=1, is the first sub-surface 121a) is smoothly connected with the first sub-surface with serial number (n+1) (for example, n=1, is the first sub-surface 121b), and the first wrinkle pattern 120 is not arranged between the two. 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, Fig. 9 As shown, there is at least one first sub-surface 121 with an even serial number, on which a first wrinkle pattern 120 is arranged, and the arranged first wrinkle pattern 120 is concave or convex, for example, the first sub-surface 121b is the first sub-surface 121 with an even serial number, therefore, the first sub-surface 121b is roughly flat and the extension direction of the surface area is roughly 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 generate lateral stress (also including stress transmitted from the first area 11) during expansion, and the setting of the first wrinkle pattern 120 can be beneficial to the release of the lateral stress, so as to further reduce the risk of stress concentration in the cover plate 100.

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

[0118] In some embodiments of the present disclosure, Fig. 10A As shown, the orthographic projections of the first wrinkle pattern 120 on the two opposite side surfaces 101 of the groove on the surface where the cover plate 100 is located are symmetrically distributed about the first area 11. In this way, when the cover plate 100 is folded or bent, the stress distribution in the transition area 12 will be relatively uniform (stress distribution and magnitude are basically equal), thereby further reducing the risk of stress concentration. For example, on the side surface 101 of each groove, the orthographic projection of the first wrinkle pattern 120 on the surface where the cover plate 100 is located is in the shape of a strip, and the extension direction of the first wrinkle pattern 120 is perpendicular to the direction from the transition area 12 to the first area 11. For example, the orthographic projection of the first wrinkle pattern 120 on the surface where the cover plate 100 is located can be further a straight line segment (ignoring its width).

[0119] In some embodiments of the present disclosure, Fig. 10A As shown, on the side surface 101 of each groove, a plurality of first fold patterns 120 are arranged in sequence in a direction away from the first area 11 , and each first fold pattern 120 extends from one side edge of the cover plate 100 to the other opposite side edge.

[0120] In other embodiments of the present disclosure, Fig. 10BAs shown, on the side surface 101 of each groove, a plurality of first pleat patterns 120 are arranged in sequence in a direction away from the first zone 11, and only one end of each first pleat pattern 120 extends to one side edge of the cover plate 100, and the edges of the cover plate 100 to which the ends of the adjacent first pleat patterns 120 extend are located on opposite sides of the cover plate 100.

[0121] In other embodiments of the present disclosure, Fig. 10C As shown, on the side surface 101 of each groove, a plurality of first fold patterns 120 are arranged in sequence along a direction away from the first area 11, and are classified into a first pattern 120a, a second pattern 120b and a 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 other 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 opposite sides of the cover plate 100.

[0122] In other embodiments of the present disclosure, Fig. 10D As shown, on the side surface 101 of each groove, the orthographic projections of multiple first pleat patterns 120 on the surface where the cover plate 100 is located are arranged into multiple rows and columns, the direction of the columns is parallel to the direction from the transition zone 12 to the first zone 11, and the direction of the rows is perpendicular to the direction from the transition zone 12 to the first zone 11, that is, the first pleat patterns 120 are arranged in a matrix.

[0123] In at least one embodiment of the present disclosure, it is possible to refer to Fig. 7A and Figure 7C The cover plate 100 further includes at least one second region 13 . The second region 13 is located on a side of the transition region 12 away from the first region 11 . The thickness of the second region 13 is greater than the thickness of the transition region 12 .

[0124] In at least one embodiment of the present disclosure, Fig. 7A and Figure 7CAs shown, the second area 13 can be set to two, and the two second areas 13 are located on opposite sides of the cover plate 100, and the transition area 12 and the first area 11 are located between the two second areas 13, that is, the transition area 12 is also set to two, and the first area 11 and the second area 13 in the panel are surrounded by a groove. On the side of the cover plate 100 where the groove is set, the surface of the transition area 12 is provided with a first fold pattern 120 at the junction with the second area 13, and the surface of the first fold pattern 120 at the junction with the second area 13 is smoothly connected to the surface of the second area 13. The second area 13 is equivalent to the non-thinning area of ​​the cover plate 100, and the thickness of the second area 13 can increase the strength of the edge of the cover plate 100 to protect the lower structure, such as the frame of the display panel 20 described below.

[0125] In an embodiment of the present disclosure, a structure similar to the above-mentioned first sub-groove may be provided for the first zone to release part of the stress, thereby reducing the stress transferred from the first zone to the transition zone, thereby reducing the risk of stress concentration on the cover plate.

[0126] In at least one embodiment of the present disclosure, Fig.11A As shown, the bottom surface 102 of the groove includes at least one second fold pattern 130, and along the direction from the transition zone 12 to the first zone 11, the surface of the second fold pattern 130 includes a curved shape in a cross section perpendicular to the surface where the cover plate 100 is located. The second fold pattern 130 can make the stress generated by the expansion of the first zone 11 gradually released in the transition zone 12 through the first fold pattern 120, thereby reducing the risk of stress concentration at the junction of the transition zone 12 and the first zone 11 and in the transition zone 12.

[0127] Optionally, the second corrugation pattern includes depressions (such as Fig.11A as shown) or raised (as Fig. 11B shown).

[0128] In at least one embodiment of the present disclosure, Fig.11A and Fig. 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 zone 12 to the first zone 11, and the second fold pattern 130 is located between at least two adjacent second sub-surfaces 131, and the surface of the second fold pattern 130 is smoothly connected to the adjacent second sub-surfaces 131.

[0129] In at least one embodiment of the present disclosure, FIG. 12A to FIG. 12D As shown, the orthographic projection of the second fold pattern 130 of the bottom surface 102 of the groove on the surface where the cover plate 100 is located is symmetrically distributed about the symmetry axis, which passes through the centroid of the first area 11 and is perpendicular to the direction from the transition area 12 to the first area 11 (as shown in FIG. Fig. 12A and Fig.12Dand / or, the orthographic projection of the second fold pattern 130 of the bottom surface 102 of the groove on the surface where the cover plate 100 is located is centrally symmetrically distributed about the centroid of the bottom surface 102 (such as Fig. 12B and Fig. 12C As shown in FIG. 1 , when the cover plate 100 is folded or bent, the stress distribution in the first area 11 will be relatively uniform (the stress distribution and magnitude are substantially equal), thereby further reducing the risk of stress concentration.

[0130] For example, FIG. 12A to FIG. 12D As shown, the orthographic projection of the second fold pattern 130 on the surface where the cover plate 100 is located includes a strip, and the extension direction (the direction of the Y axis) of the second fold pattern 130 is perpendicular to the direction (the direction of the X axis) from the transition area 12 to the first area 11. For example, the orthographic projection of the second fold pattern 130 on the surface where the cover plate 100 is located can be further a straight line segment (ignoring its width).

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

[0132] In some embodiments of the present disclosure, Fig. 12A As shown, the second fold pattern 130 extends from one side edge of the cover plate 100 to the other opposite side edge.

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

[0134] In other embodiments of the present disclosure, Fig. 12C As shown, the second pleat 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 other 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 the present disclosure, Fig.12DAs shown, the second pleat pattern 130 included in the cover plate 100 is arranged in a plurality of rows and columns on the surface where the cover plate 100 is located, and the direction of the column is perpendicular to the direction from the transition zone 12 to the first zone 11 (for example, the direction of the X-axis, which is perpendicular to the above-mentioned axis of symmetry), and the direction of the row is parallel to the direction from the transition zone 12 to the first zone 11 (for example, the direction of the Y-axis, which is parallel to the above-mentioned axis of symmetry).

[0136] It should be noted that in the embodiment of the present disclosure, when the cover plate includes only one transition zone, the specific design scheme of the side surface of the transition zone, the surface of the first zone, whether to set the second zone, etc. in the cover plate can refer to the relevant structure when the cover plate includes at least two transition zones, and will not be described in detail here. Fig.13A As shown, the cover plate 100 is provided with only one transition zone 12. The structure of the cover plate 100 can be referred to Fig.11A The structure of the cover plate 100 shown in FIG. Fig. 13B As shown, the cover plate 100 is provided with only one transition zone 12. The structure of the cover plate 100 can be referred to Fig. 9 The structure of the cover plate 100 is shown.

[0137] At least one embodiment of the present disclosure provides a cover plate, the cover plate includes at least one transition zone and at least one first zone, the first zone is adjacent to the transition zone, the transition zone protrudes from the first zone on one side in the thickness direction of the cover plate, 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. The structure of the cover plate, the technical problems solved, and the further improvements that can be made, etc., can be referred to the relevant descriptions in the aforementioned embodiments, and will not be elaborated here.

[0138] In at least one embodiment of the present disclosure, the portion of the transition zone protruding from the first zone includes a side surface facing the first zone, and the side surface includes a step shape. The structure of the cover plate, the technical problems solved, and further improvements that can be made can refer to the aforementioned embodiments (for example, at least Fig. 9 The relevant descriptions in the embodiment shown in the figure are not repeated here.

[0139] It should be noted that in the embodiments of the present disclosure, there is no limit on the number of first zones, transition zones, and second zones, and they can be designed according to the specific scenarios in which the cover plate is used. For example, in some embodiments, the first zone, transition zone, and second zone can be set as follows: Fig.13A and Fig. 13B For example, in some other embodiments, Fig.12D As shown, the first zone 11 can be set as one, and the transition zone 12 and the second zone 13 can be set as two each. For example, in some other embodiments, as Fig.14Aand Fig. 14B As shown, the number of the first zones 11 can be two, the number of the transition zones 12 can be four, and the number of the second zones 13 can be three.

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

[0141] In at least one embodiment of the present disclosure, Fig.15 As shown, the display module may further include a protective adhesive layer 200. The cover plate 100 and the protective adhesive layer 200 are used to 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 on one side where the groove is provided, and the portion of the protective adhesive layer 200 covering the groove has a flattened surface. The protective adhesive layer 200 may be an optical adhesive, which can not only flatten the surface 100a of the cover plate 100 where the groove is provided, but also has a certain strength after curing to protect the cover plate 100.

[0142] In at least one embodiment of the present disclosure, Fig.15 As shown, the cover assembly 10 of the display module further 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 the present disclosure, Fig.15 As shown, the cover plate assembly 10 of the display module further includes a bonding adhesive layer 400 , and the bonding adhesive layer 400 is located between the cover plate 100 and the protective film 300 to bond the cover plate 100 and the protective film 300 .

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

[0145] In at least one embodiment of the present disclosure, Fig.16 As shown, the display module may further include a display panel 20, which is located on a side of the cover plate 100 included in the cover plate assembly 10 where the groove is provided. 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 aforementioned embodiments of the present disclosure.

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

[0147] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0148] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

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

Claims

1. A cover plate, characterized in that: comprising at least one transition zone and at least one first zone, the first zone being adjacent to the transition zone, wherein a thickness of the first zone is smaller than a thickness of the transition zone, so that the transition zone has a side surface facing the first zone on one side of the cover plate, and 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 zone and the surface of the first zone, and the thickness of at least part of the cover plate located in the first sub-groove is smaller than the thickness of at least part of the cover plate located in the first zone.

2. The cover plate according to claim 1, characterized in that: The cover plate comprises only one transition zone; or The cover plate includes at least two transition zones, the first zone is located between adjacent transition zones, and on one side of the cover plate, the surfaces of the transition zone 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 comprises a smooth surface; Preferably, on the side of the cover plate where the first sub-groove is provided, the surface of the first sub-groove is smoothly connected to the surface of the cover plate located in the first zone, and / or the surface of the first sub-groove is smoothly connected to the surface of the cover plate located in the transition zone.

4. The cover plate according to claim 3, characterized in that: Along the direction from the transition area to the first area, the pattern of the first sub-groove on the cross section of the cover plate includes an arc, and the cross section of the cover plate is perpendicular to the surface where 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 wave shape, and the cross section of the cover plate is perpendicular to the surface where the cover plate is located.

5. The cover plate according to claim 1, characterized in that: The orthographic projection of the first sub-groove on 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 area to the first area; Preferably, 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 the first sub-groove extends from one side edge of the cover plate to the other opposite side 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 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 in sequence along a direction perpendicular to a direction from the transition zone to the first zone; Preferably, 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 respectively 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 have their orthographic projections on the surface where the cover plate is located symmetrically distributed about the first zone.

6. 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.

7. The cover plate according to any one of claims 1 to 6, characterized in that: The side surface of the transition zone includes at least one first fold pattern, and along the direction from the transition zone to the first zone, the surface of the first fold pattern includes a curved shape in a cross section perpendicular to the surface where the cover plate is located.

8. The cover plate according to claim 7, characterized in that: The first corrugation pattern includes depressions and / or protrusions.

9. The cover plate according to claim 7, characterized in that: The side surface of the transition zone includes a plurality of the first fold patterns, and the first fold patterns are smoothly connected to each other; Preferably, along the direction from the transition zone to the first zone, the surface of the first fold pattern includes a wave shape in a cross section perpendicular to the surface where the cover plate is located.

10. The cover plate according to claim 7, characterized in that: The side surface of the transition zone further includes at least two first sub-surfaces, the first fold pattern is located between at least two adjacent first sub-surfaces, and the surface of the first fold pattern is smoothly connected to the adjacent first sub-surfaces.

11. The cover plate according to claim 10, characterized in that: The side surface of the transition region includes a plurality of the first sub-surfaces, the plurality of the first sub-surfaces form a step type, the plurality of the first sub-surfaces are arranged from close to the first region to far away from the first region, the first sub-surface with a sequence number of n and the first sub-surface with a sequence number of (n+1) form a step, and n is an odd number and greater than or equal to 1; The first fold pattern is arranged between the first sub-surface with a serial number (n+1) and the first sub-surface with a serial number (n+2), and the first fold pattern between the first sub-surface with a serial number (n+1) and the first sub-surface with a serial number (n+2) includes a depression; Preferably, the first wrinkle 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 respectively positive integers greater than or equal to 1, and q and m are different; Preferably, the first sub-surface with a serial number of n is smoothly connected to the first sub-surface with a serial number of (n+1).

12. The cover plate according to claim 7, characterized in that: 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 on the surface where the cover plate is located are symmetrically distributed about the first zone.

13. The cover plate according to claim 7, characterized in that: On the side surface of each of the transition areas, the orthographic projection of the first fold pattern on the surface where the cover plate is located includes a strip shape, and an extension direction of the first fold pattern is perpendicular to a direction from the transition area to the first area.

14. The cover plate according to claim 13, characterized in that: On the side surface of each of the transition areas, a plurality of the first fold patterns are arranged in sequence in a direction away from the first area, and each of the first fold patterns extends from one side edge of the cover plate to another opposite side edge; or On the side surface of each of the transition areas, a plurality of the first fold patterns are sequentially arranged in a direction away from the first area, only one end of each of the first fold patterns extends to one side edge of the cover plate, and the edges of the cover plate to which the ends of the first fold patterns adjacent to each other extend are located on opposite sides of the cover plate; or On the side surface of each of the transition zones, a plurality of the first fold patterns are sequentially arranged in a direction away from the first zone and are classified into 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 other 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 of the transition zones, the orthographic projections of the plurality of first pleat patterns on the surface where the cover plate is located are arranged into multiple rows and columns, the direction of the columns is parallel to the direction from the transition zone to the first zone, and the direction of the rows is perpendicular to the direction from the transition zone to the first zone.

15. The cover plate according to claim 1, characterized in that: Also comprising at least one second zone, wherein the second zone is adjacent to the transition zone, and a thickness of the second zone is greater than a thickness of the transition zone; Preferably, the at least one second zone includes two second zones, the two second zones are located on two opposite sides of the cover plate, and the transition zone and the first zone are located between the two second zones.

16. The cover plate according to claim 1, characterized in that: The surface of the first area includes at least one second fold pattern, and along the direction from the transition area to the first area, the surface of the second fold pattern includes a curved shape in a cross section perpendicular to the surface where the cover plate is located; Preferably, the second wrinkle pattern comprises depressions and / or protrusions; Preferably, the surface of the first zone also includes at least two second sub-surfaces, and the at least two second sub-surfaces are distributed along the direction from the transition zone to the first zone. 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.

17. The cover plate according to claim 16, characterized in that: The orthographic projection of the second fold pattern on the surface where the cover plate is located includes a strip shape, and the extension direction of the second fold pattern is perpendicular to the direction from the transition area to the first area; Preferably, Each of the second fold patterns extends from one side edge of the cover plate to another opposite side edge; or Only one end of each of the second fold patterns extends to one side edge of the cover plate, and the edges of the cover plate to which the ends of the adjacent second fold patterns extend are located on opposite sides of the cover plate; or A plurality of the second fold patterns are classified into a fourth pattern, a fifth pattern and a sixth pattern, the fourth pattern and the sixth pattern are located on both sides of the fifth pattern, the fifth pattern extends from one side edge of the cover plate to the other opposite side edge, only one end of the fourth pattern and the sixth pattern extends 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; or The orthographic projections of the plurality of second fold patterns on the surface of the cover plate are arranged in multiple rows and columns, the direction of the columns is perpendicular to the direction from the transition zone to the first zone, and the direction of the rows is parallel to the direction from the transition zone to the first zone.

18. A cover plate, characterized in that: The cover plate comprises at least one transition zone and at least one first zone, wherein the first zone is adjacent to the transition zone, and the transition zone protrudes from the first zone on one side in the thickness direction of the cover plate, and 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, and the thickness of at least a portion of the cover plate located in the first sub-groove is smaller than the thickness of at least a portion of the cover plate located in the first zone.

19. The cover plate according to claim 18, characterized in that: A portion of the transition region protruding from the first region includes a side surface facing the first region, and the side surface includes a step shape.

20. A display module, characterized in that: A cover plate comprising the cover plate according to any one of claims 1 to 19.

21. The display module according to claim 20, 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 a side surface of the side surface where the transition zone is provided, and the protective adhesive layer is a planarization film layer; Preferably, the display module further comprises a protective film, and the protective film is located on a side of the cover plate away from the protective adhesive layer; Preferably, the display module further comprises a bonding adhesive layer, and the bonding adhesive layer is located between the cover plate and the protective film; Preferably, the display module further comprises a shading structure, wherein the shading structure is located on the surface of the protective film facing the cover plate and covers the edge of the protective film.

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