Rollable display panel and manufacturing method thereof, and display device

Abstract

The present disclosure relates to the field of display technology, and proposes a rollable display panel, a manufacturing method thereof, and a display device. The rollable display panel includes: a first structural layer, a second structural layer, a first adhesive layer stacked between the first structural layer and the second structural layer, and a curling area, a strain accumulation area, and a flattening area sequentially distributed along the curling direction; wherein the thickness of the first adhesive layer located in the strain accumulation area is greater than the thickness of the first adhesive layer located in the curling area and the flattening area. The rollable display panel can reduce the risk of interlayer detachment.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a rollable display panel and a manufacturing method thereof, and a display device. Background Art

[0002] A rollable display panel refers to a flexible display panel that can be rolled along a preset rolling radius. The rollable display panel mainly includes a rolling area, a flat area, and a strain accumulation area between the flat area and the rolling area. The rollable display panel can be rolled in the rolling area, thereby generating a large strain accumulation in the strain accumulation area. Therefore, the various structural layers in the rollable display panel are prone to detachment in the strain accumulation area.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] The purpose of the present disclosure is to provide a rollable display panel and a manufacturing method thereof, and a display device, wherein the rollable display panel can solve the technical problem that various structural layers in the rollable display panel are easily separated in the strain accumulation area.

[0005] Other features and advantages of the present disclosure will become apparent from the following detailed description or may be learned by practice of the present disclosure.

[0006] According to one aspect of the present disclosure, a rollable display panel is provided, which includes: a first structural layer, a second structural layer, a first bonding layer stacked between the first structural layer and the second structural layer, and a curling area, a strain accumulation area, and a flattening area sequentially distributed along a curling direction; wherein the thickness of the first bonding layer located in the strain accumulation area is greater than the thickness of the first bonding layer located in the curling area and the flattening area.

[0007] In an exemplary embodiment of the present disclosure, at least one of the first structural layer and the second structural layer has an elastic modulus located in the strain accumulation area that is smaller than the elastic modulus located in the curling area and the flattening area.

[0008] In an exemplary embodiment of the present disclosure, the first structural layer is a flexible cover plate, the second structural layer is a flexible array substrate, and the elastic modulus of the flexible cover plate located in the strain accumulation area is smaller than the elastic modulus of the flexible cover plate located in the curling area and the flattening area.

[0009] In an exemplary embodiment of the present disclosure, the first structural layer is a flexible cover plate, the second structural layer is a flexible array substrate, and the flexible cover plate includes: a first ultra-thin glass layer, a first polymer film, and a first hardening layer. The first ultra-thin glass layer is located on the side of the first adhesive layer away from the flexible array substrate; the first polymer film is located on the side of the first ultra-thin glass layer away from the flexible array substrate; the first hardening layer is located on the side of the first polymer film away from the flexible array substrate; wherein the side of the first ultra-thin glass layer facing the first polymer film is chamfered at its curling side for curling.

[0010] In an exemplary embodiment of the present disclosure, the chamfer is a curved chamfer or a flat chamfer.

[0011] In an exemplary embodiment of the present disclosure, the chamfer extends to a side of the first ultra-thin glass layer facing away from the first polymer film.

[0012] In an exemplary embodiment of the present disclosure, the flexible cover further includes a second adhesive layer, and the second adhesive layer is located between the first ultra-thin glass layer and the first polymer film.

[0013] In an exemplary embodiment of the present disclosure, the first structural layer is a flexible cover plate, the second structural layer is a flexible array substrate, and the flexible cover plate includes: a second ultra-thin glass layer, a second polymer film, and a second hardening layer. The second ultra-thin glass layer is located on the side of the first adhesive layer away from the flexible array substrate; the second polymer film is located on the side of the second ultra-thin glass layer away from the flexible array substrate; the second hardening layer is located on the side of the second polymer film away from the flexible array substrate; wherein the thickness of the second ultra-thin glass layer located in the curling area is less than the thickness of the second ultra-thin glass layer located in the flattening area and the strain accumulation area.

[0014] In an exemplary embodiment of the present disclosure, a concave structure located in the curling area is formed on a side of the second ultra-thin glass layer facing the second polymer film.

[0015] In an exemplary embodiment of the present disclosure, the flexible cover plate also includes a third polymer film, which is located on the side of the second ultra-thin glass layer facing the flexible array substrate; the second ultra-thin glass layer is formed with a recessed structure located in the curling area on the side facing the third polymer film.

[0016] In an exemplary embodiment of the present disclosure, the side of the second ultra-thin glass layer facing the second polymer film is chamfered at its curling side edge for curling.

[0017] In an exemplary embodiment of the present disclosure, the first ultra-thin glass layer is an ultra-thin glass layer that has been hardened.

[0018] According to one aspect of the present disclosure, a method for manufacturing a rollable display panel is provided, wherein the rollable display panel comprises: a roll area, a strain accumulation area, and a flattening area sequentially distributed along a roll direction, and the manufacturing method comprises:

[0019] providing a second structural layer;

[0020] Forming a first bonding layer on one side of the second structural layer, wherein the thickness of the first bonding layer in the strain accumulation area is greater than the thickness of the first bonding layer in the curling area and the flattening area;

[0021] A first structural layer is formed, and the first structural layer is attached to a side of the first adhesive layer facing away from the second structural layer.

[0022] In an exemplary embodiment of the present disclosure, the first structural layer is a flexible cover plate, and the second structural layer is a flexible array substrate, forming a flexible cover plate, including:

[0023] forming a resin material layer;

[0024] Curing different positions of the resin material layer to different degrees to form the resin material layer into the flexible cover plate;

[0025] The curing degree of the flexible cover plate in the strain accumulation area is lower than that in the curling area and the flattening area.

[0026] In an exemplary embodiment of the present disclosure, the first structural layer is a flexible cover plate, and the second structural layer is a flexible array substrate, forming a flexible cover plate, including:

[0027] forming a first ultra-thin glass layer, wherein a first side surface of the first ultra-thin glass layer is chamfered at a curling side edge thereof for curling;

[0028] forming a first polymer film on one side of the first ultra-thin glass layer;

[0029] forming a first hardened layer on a side of the first polymer film facing away from the first ultra-thin glass layer;

[0030] Attaching the flexible cover plate to a side of the first adhesive layer facing away from the flexible array substrate comprises:

[0031] The side of the first ultra-thin glass layer facing away from the first polymer film is attached to the side of the first adhesive layer facing away from the flexible array substrate.

[0032] In an exemplary embodiment of the present disclosure, forming a first ultra-thin glass layer includes:

[0033] providing a layer of glass material;

[0034] Performing a thinning process on the glass material layer;

[0035] The thinned glass material layer is strengthened to form the first ultra-thin glass layer.

[0036] In an exemplary embodiment of the present disclosure, the first structural layer is a flexible cover plate, and the second structural layer is a flexible array substrate, forming a flexible cover plate, including:

[0037] forming a second ultra-thin glass layer, wherein the thickness of the second ultra-thin glass layer in the curling area is less than the thickness of the second ultra-thin glass layer in the flattening area and the strain accumulation area;

[0038] forming a second polymer film on one side of the second ultra-thin glass layer;

[0039] forming a second hardened layer on a side of the second polymer film facing away from the second ultra-thin glass layer;

[0040] Attaching the flexible cover plate to a side of the first adhesive layer facing away from the flexible array substrate comprises:

[0041] The side of the second ultra-thin glass layer facing away from the second polymer film is attached to the side of the first adhesive layer facing away from the flexible array substrate.

[0042] In an exemplary embodiment of the present disclosure,

[0043] A concave structure located in the curling area is formed on a side of the second ultra-thin glass layer facing the second polymer film.

[0044] In an exemplary embodiment of the present disclosure, a concave structure located in the curling area is formed on a side of the second ultra-thin glass layer facing away from the second polymer film;

[0045] Forming the flexible cover also includes:

[0046] forming a third polymer film on a side of the second ultra-thin glass layer facing away from the second polymer film;

[0047] Attaching the flexible cover plate to a side of the first adhesive layer facing away from the flexible array substrate comprises:

[0048] The side of the third polymer film facing away from the second ultra-thin glass layer is attached to the side of the first adhesive layer facing away from the flexible array substrate.

[0049] According to one aspect of the present disclosure, a display device is provided, comprising the above-mentioned display panel.

[0050] The present disclosure provides a rollable display panel and a manufacturing method thereof, and a display device. The rollable display panel includes: a first structural layer, a second structural layer, a first adhesive layer stacked between the first structural layer and the second structural layer, and a curling area, a strain accumulation area, and a flattening area sequentially distributed along the curling direction; wherein the thickness of the first adhesive layer located in the strain accumulation area is greater than the thickness of the first adhesive layer located in the curling area and the flattening area. The rollable display panel can accumulate more stress through the high-thickness first adhesive layer located in the strain accumulation area, thereby reducing the risk of interlayer detachment of the rollable display panel.

[0051] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0053] Figure 1 It is a structural schematic diagram of a rollable display panel in the related art;

[0054] Figure 2 A schematic structural diagram of an exemplary embodiment of a rollable display panel disclosed herein;

[0055] Figure 3 A schematic diagram of a method for manufacturing a flexible cover plate in an exemplary embodiment of a rollable display panel disclosed herein;

[0056] Figure 4 is a structural schematic diagram of another exemplary embodiment of the rollable display panel disclosed in the present invention;

[0057] Figure 5 It is a structural schematic diagram of a flexible cover plate in the related art;

[0058] Figure 6 It is a schematic structural diagram of a flexible cover plate in another exemplary embodiment of the rollable display panel disclosed in the present invention;

[0059] Figure 7 It is a schematic structural diagram of a flexible cover plate in another exemplary embodiment of the rollable display panel disclosed in the present invention;

[0060] Figure 8 A schematic diagram of the manufacturing process of the first ultra-thin glass layer in another exemplary embodiment of the rollable display panel disclosed in the present invention;

[0061] Fig. 9 It is a schematic structural diagram of a flexible cover plate in another exemplary embodiment of the rollable display panel disclosed in the present invention;

[0062] Fig.10 It is a schematic structural diagram of a flexible cover plate in another exemplary embodiment of the rollable display panel disclosed in the present invention. DETAILED DESCRIPTION

[0063] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the present disclosure will be more comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0064] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as the orientation of the examples described in the drawings. It is understood that if the device of the illustration is turned upside down, the component described as "upper" will become the component "lower". Other relative terms, such as "high", "low", "top", "bottom", "left", "right", etc., also have similar meanings. When a structure is "on" other structures, it may mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0065] The terms "a", "an", and "the" are used to indicate the presence of one or more elements / component distinctions / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / component distinctions / etc. may exist in addition to the listed elements / component distinctions / etc.

[0066] like Figure 1 As shown in FIG. 1 , it is a schematic diagram of the structure of a rollable display panel in the related art, and the rollable display panel includes a flexible cover plate 01, a flexible array substrate 03, and an adhesive layer 02 located between the flexible array substrate 03 and the flexible cover plate 01. Figure 1As shown, the rollable display panel includes a roll area 41, a strain accumulation area 42, and a flat area 43. The rollable display panel is rolled in the roll area 41. When the rollable display panel is rolled, the lengths of the flexible cover plate 01 and the flexible array substrate 03 on the roll path are different, so that a large strain accumulation is generated in the strain accumulation area 42. Figure 1 As shown, strain accumulation will cause the flexible array substrate 03 and the adhesive layer 02 to bulge inwardly toward the curling in the strain accumulation area 42 , thereby easily causing the flexible cover 01 and the flexible array substrate 03 to separate in the strain accumulation area 42 .

[0067] Based on this, the present exemplary embodiment provides a rollable display panel, such as Figure 2 The figure is a schematic diagram of the structure of an exemplary embodiment of the rollable display panel of the present disclosure. The rollable display panel comprises: a first structural layer 1, a second structural layer 3, a first adhesive layer 2 stacked between the first structural layer 1 and the second structural layer 3, and a curling area 41, a strain accumulation area 42, and a flattening area 43 sequentially distributed along the curling direction; wherein the thickness of the first adhesive layer 2 located in the strain accumulation area 42 is greater than the thickness of the first adhesive layer 2 located in the curling area 41 and the flattening area 43.

[0068] In the rollable display panel, the first adhesive layer 2 can absorb the strain in the strain accumulation area along the roll direction, and the thickness of the first adhesive layer is positively correlated with its ability to absorb the strain. The rollable display panel can absorb more stress accumulation by increasing the thickness of the first adhesive layer in the strain accumulation area, thereby reducing the risk of interlayer detachment of the rollable display panel.

[0069] In this exemplary embodiment, the first structural layer may be a flexible cover plate, and the second structural layer may be a flexible array substrate. It should be understood that in other exemplary embodiments, the first structural layer and the second structural layer may also be other structures. For example, the first structural layer may be a support film, and the second structural layer may be a metal support layer.

[0070] The following is an example of how to set the thickness of the first adhesive layer in the strain accumulation area. In a rollable display panel with a curling radius r of 5mm, the length of the strain accumulation area along the curling direction can be 20mm. When the rollable display panel is rolled up one circle, the theoretical strain accumulation of the flexible cover plate and the flexible array substrate is 0.8mm. The first adhesive layer can be an optical adhesive layer. When the thickness of the first adhesive layer in the curling area, the strain accumulation area, and the flat area is the same, the first adhesive layer can absorb 0.6mm of strain accumulation. The strain rate that the first adhesive layer can absorb per unit size can be calculated to be about 2% by the formula 0.6 / 2πr, so the strain absorption of the first adhesive layer in the strain accumulation area can be calculated to be 0.4mm according to the formula 20mm*2%. If the extra strain accumulation of 0.2mm needs to be absorbed by the first adhesive layer in the strain accumulation area, the strain absorption of the strain accumulation area should be 0.6mm. Since the thickness of the first adhesive layer is linearly related to its ability to absorb strain accumulation, it is necessary to increase the thickness of the first adhesive layer in the strain accumulation area to 1.5 times the original thickness.

[0071] In this exemplary embodiment, the elastic modulus of at least one of the first structural layer 1 and the second structural layer 3 in the strain accumulation region is smaller than the elastic modulus in the curling region and the flattening region. This setting can reduce the elastic modulus of the first structural layer 1 and / or the second structural layer 3 in the strain accumulation region to increase its bendability, thereby reducing the strain accumulation of the first structural layer 1 and the second structural layer 3 by increasing the strain of the first structural layer 1 and / or the second structural layer 3 itself.

[0072] For example, when the first structural layer is a flexible cover plate and the second structural layer is a flexible array substrate, the elastic modulus of the flexible cover plate located in the strain accumulation area can be set to be smaller than the elastic modulus of the flexible cover plate located in the curling area and the flattening area.

[0073] The following is an example of how to set the elastic modulus of the flexible cover in the strain accumulation zone. When the rollable display panel is rolled up one circle, the theoretical strain accumulation of the flexible cover and the flexible array substrate can be 0.8mm, the first adhesive layer can absorb 0.6mm of strain accumulation, and the length of the strain accumulation zone along the rolling direction can be 20mm. If the extra 0.2mm strain accumulation is absorbed by the flexible cover in the strain accumulation zone, the strain absorbed per unit size of the flexible cover in the strain accumulation zone needs to be changed from 0.15 to 0.25. Since the bending ability of the flexible cover is linearly related to its ability to absorb strain accumulation, the extra 0.2mm strain accumulation can be completely absorbed by changing the elastic modulus of the flexible cover in the strain accumulation zone to 0.6 times its original elastic modulus.

[0074] In this exemplary embodiment, a patterning process can be used to achieve a first bonding layer with different thicknesses in the strain accumulation region, the curling region, and the flattening region, or a mold extrusion method can be used to achieve a first bonding layer with different thicknesses in the strain accumulation region, the curling region, and the flattening region.

[0075] In this exemplary embodiment, the method for manufacturing the rollable display panel may include: first forming a flexible cover plate, a first adhesive layer, and a flexible array substrate, and then attaching the flexible cover plate, the first adhesive layer, and the flexible array substrate to each other to form a rollable display panel.

[0076] In this exemplary embodiment, the flexible cover plate may be a resin layer. Figure 3 As shown, it is a schematic diagram of a method for manufacturing a flexible cover plate in an exemplary embodiment of the rollable display panel disclosed in the present invention. Forming the flexible cover plate may include: forming a resin material layer 5; the material of the resin material layer 5 may include one or more of transparent polyimide, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), thermoplastic polyurethane (TPU), polyaramid, polyethylene (PE), polypropylene (PP), polymethyl methacrylate (PMMA) and other resin materials. Different positions of the resin material layer 5 are cured to different degrees to form the resin material layer 5 into the flexible cover plate; wherein the degree of curing of the portion of the flexible cover plate located in the strain accumulation area 42 is less than the degree of curing of the portion located in the curling area 41 and the flattening area 43. In this exemplary embodiment, the curing method of the resin material layer 5 may adopt ultraviolet curing, thermal curing and other methods.

[0077] In this exemplary embodiment, Figure 4 As shown, it is a schematic diagram of the structure of another exemplary embodiment of the rollable display panel of the present disclosure. The rollable display panel may also include a third adhesive layer 62, a fourth adhesive layer 63, a fifth adhesive layer 65, an optical functional layer 61, a support film 64, and a metal support layer 66. Among them, the flexible cover plate 1, the first adhesive layer 2, the optical functional layer 61, the third adhesive layer 62, the flexible array substrate 3, the fourth adhesive layer 63, the support film 64, the fifth adhesive layer 65, and the metal support layer 66 are stacked in sequence. Among them, the thickness of at least one of the first adhesive layer 2, the third adhesive layer 62, the fourth adhesive layer 63, and the fifth adhesive layer 65 located in the strain accumulation area 42 may be greater than the thickness located in the curling area 41 and the flattening area 43. The optical functional layer 61 may be a polarizer.

[0078] like Figure 5 As shown in FIG. 1 , it is a schematic diagram of the structure of a flexible cover plate in the related art. The flexible cover plate may include: a first ultra-thin glass layer 11, an adhesive layer 14, a first polymer film 12, and a first hardening layer 13 stacked in sequence. Figure 5As shown in the dotted frame 15, the side of the first ultra-thin glass layer 11 facing the first polymer film 12 is a right angle structure at its curling side edge for curling. Figure 5 As shown, the curling direction of the flexible cover can be Figure 5 Since the first ultra-thin glass layer 11 is a fragile structure, when the first ultra-thin glass layer 11 is bent, the stress generated by the bending of the flexible cover plate is easily concentrated on the right angle of the right angle structure at the dotted frame 15, thereby causing damage to the first ultra-thin glass layer 11.

[0079] In another exemplary embodiment of the present disclosure, Figure 6 As shown, it is a schematic diagram of the structure of a flexible cover in another exemplary embodiment of the rollable display panel of the present disclosure. The flexible cover may include: a first ultra-thin glass layer 11, a first polymer film 12, and a first hardening layer 13. The first ultra-thin glass layer 11 may be located on the side of the first adhesive layer away from the flexible array substrate; the first polymer film 12 is located on the side of the first ultra-thin glass layer away from the flexible array substrate; the first hardening layer 13 is located on the side of the first polymer film 12 away from the flexible array substrate; wherein the side of the first ultra-thin glass layer 11 facing the first polymer film 12 is chamfered on its curling side for curling. This setting can disperse the stress of the side of the first ultra-thin glass layer 11 facing the first polymer film 12 on its curling side, thereby reducing the risk of damage to the first ultra-thin glass layer. Among them, the first polymer film has a strong bending ability to facilitate the bending of the flexible cover. However, the first polymer film is prone to permanent deformation in a high temperature and high humidity environment. The first ultra-thin glass layer 11 is an inorganic material and has a strong recovery ability, thereby improving the recovery ability of the flexible cover. The first hardening layer 13 has a large pencil hardness to improve the pencil hardness of the surface of the flexible cover. The material of the first polymer film 12 may include one or more of transparent polyimide (CPI), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and thermoplastic polyurethane (TPU). The material of the first hardening layer 13 may include one or more of siloxane and acrylate. The first polymer film 12 can be selected from a material with a refractive index close to that of the first ultra-thin glass layer to avoid light refracting between the first ultra-thin glass layer and the first polymer film.

[0080] In this exemplary embodiment, Figure 6 As shown, the chamfer may be a curved chamfer. It should be understood that in other exemplary embodiments, the chamfer may also be a flat chamfer.

[0081] In this exemplary embodiment, Figure 7, which is a schematic diagram of the structure of a flexible cover plate in another exemplary embodiment of a rollable display panel disclosed in the present invention. The chamfer may extend to the side of the first ultra-thin glass layer 11 facing away from the first polymer film.

[0082] In this exemplary embodiment, Figure 6 , 7 As shown, the flexible cover plate further includes a second adhesive layer 14, and the second adhesive layer 14 is located between the first ultra-thin glass layer 11 and the first polymer film 12. The second adhesive layer 14 can be a pressure-sensitive adhesive. It should be understood that the second adhesive layer 14 may not be provided between the first ultra-thin glass layer 11 and the first polymer film 12, and the first polymer film 12 may be directly formed on the first ultra-thin glass layer 11 by a coating process. On the one hand, this setting can fill the cracks on the first ultra-thin glass layer 11 with the first polymer, thereby improving the strength of the first ultra-thin glass layer 11; on the other hand, the flexible cover plate avoids the setting of the soft second adhesive layer, thereby improving the overall hardness of the flexible cover plate.

[0083] In this exemplary embodiment, the first ultra-thin glass layer may be a strengthened glass layer. Figure 8 FIG. 2 is a schematic diagram of a manufacturing process of a first ultra-thin glass layer in another exemplary embodiment of a rollable display panel disclosed herein. The manufacturing method of the first ultra-thin glass layer may include: providing a glass material layer 110; thinning the glass material layer 110 to obtain a semi-finished product 111; and strengthening the thinned glass material layer to form the first ultra-thin glass layer 11.

[0084] In another exemplary embodiment of the present disclosure, Fig. 9 As shown, it is a schematic diagram of the structure of the flexible cover plate in another exemplary embodiment of the rollable display panel disclosed in the present invention. The flexible cover plate may include: a second ultra-thin glass layer 11, a second polymer film 12, and a second hardening layer 13. The second ultra-thin glass layer 11 is located on the side of the first adhesive layer away from the flexible array substrate; the second polymer film 12 is located on the side of the second ultra-thin glass layer away from the flexible array substrate; the second hardening layer 13 is located on the side of the second polymer film 12 away from the flexible array substrate; wherein, the thickness of the second ultra-thin glass layer 11 located in the curling area 41 is less than the thickness of the second ultra-thin glass layer 11 located in the flat area 43 and the strain accumulation area 42. This setting thins the second ultra-thin glass layer 11 in the curling area 41, thereby facilitating the bending of the second ultra-thin glass layer 11 in the curling area 41. wherein, as Fig. 9 As shown, the X direction is the curling direction of the flexible cover.

[0085] Among them, the second polymer film has a strong bending ability to facilitate the bending of the flexible cover; however, the second polymer film is prone to permanent deformation under high temperature and high humidity environment, and the second ultra-thin glass layer is an inorganic material with a strong recovery ability, so as to facilitate the recovery of the flexible cover. The second hardening layer 13 has a large pencil hardness to increase the pencil hardness of the surface of the flexible cover. The material of the second polymer film 12 may include one or more of transparent polyimide (CPI), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and thermoplastic polyurethane (TPU). The material of the second hardening layer 13 may include one or more of siloxane and acrylate. The second polymer film 12 can be selected from a material with a refractive index close to that of the first ultra-thin glass layer to avoid light refracting between the first ultra-thin glass layer and the first polymer film.

[0086] The second polymer film 12 can be directly formed on the second ultra-thin glass layer 11 through a coating process. On the one hand, this setting can fill the cracks on the second ultra-thin glass layer 11 through the second polymer, thereby improving the strength of the second ultra-thin glass layer 11; on the other hand, the flexible cover plate avoids the setting of a soft adhesive layer between the second ultra-thin glass layer and the second polymer film, thereby improving the overall hardness of the flexible cover plate.

[0087] In this exemplary embodiment, Fig. 9 As shown, the second ultra-thin glass layer 11 is formed with a concave structure located in the curling area on the side facing the second polymer film 12, so that the thickness of the second ultra-thin glass layer 11 located in the curling area 41 is smaller than the thickness of the second ultra-thin glass layer 11 located in the flat area 43 and the strain accumulation area 42. It should be understood that in other exemplary embodiments, such as Fig.10 FIG. 1 is a schematic diagram of the structure of a flexible cover in another exemplary embodiment of a rollable display panel of the present disclosure. The flexible cover may further include a third polymer film 15, which is located on the side of the second ultra-thin glass layer 11 facing the flexible array substrate; the second ultra-thin glass layer 11 is formed with a concave structure located in the roll-up area on the side facing the third polymer film 15, so that the thickness of the second ultra-thin glass layer 11 located in the roll-up area 41 is further reduced.

[0088] It should be understood that Fig. 9 , 10 In the flexible cover shown, the side of the second ultra-thin glass layer 11 facing the second polymer film 12 may also be chamfered at its curling side edge for curling.

[0089] In this exemplary embodiment, each adhesive layer in the rollable display panel may be an optical adhesive layer or a pressure-sensitive adhesive layer.

[0090] An exemplary embodiment of the present disclosure further provides a method for manufacturing a rollable display panel, wherein the rollable display panel includes: a rollable area, a strain accumulation area, and a flattening area sequentially distributed along a rollable direction, and the manufacturing method includes:

[0091] providing a second structural layer;

[0092] Forming a first bonding layer on one side of the second structural layer, wherein the thickness of the first bonding layer in the strain accumulation area is greater than the thickness of the first bonding layer in the curling area and the flattening area;

[0093] A first structural layer is formed, and the first structural layer is attached to a side of the first adhesive layer facing away from the second structural layer.

[0094] In an exemplary embodiment of the present disclosure, the first structural layer is a flexible cover plate, and the second structural layer is a flexible array substrate, forming a flexible cover plate, including:

[0095] forming a resin material layer;

[0096] Curing different positions of the resin material layer to different degrees to form the resin material layer into the flexible cover plate;

[0097] The curing degree of the flexible cover plate in the strain accumulation area is lower than that in the curling area and the flattening area.

[0098] In an exemplary embodiment of the present disclosure, the first structural layer is a flexible cover plate, and the second structural layer is a flexible array substrate, forming a flexible cover plate, including:

[0099] forming a first ultra-thin glass layer, wherein a first side surface of the first ultra-thin glass layer is chamfered at a curling side edge thereof for curling;

[0100] forming a first polymer film on one side of the first ultra-thin glass layer;

[0101] forming a first hardened layer on a side of the first polymer film facing away from the first ultra-thin glass layer;

[0102] Attaching the flexible cover plate to a side of the first adhesive layer facing away from the flexible array substrate comprises:

[0103] The side of the first ultra-thin glass layer facing away from the first polymer film is attached to the side of the first adhesive layer facing away from the flexible array substrate.

[0104] In an exemplary embodiment of the present disclosure, forming a first ultra-thin glass layer includes:

[0105] providing a layer of glass material;

[0106] Performing a thinning process on the glass material layer;

[0107] The thinned glass material layer is strengthened to form the first ultra-thin glass layer.

[0108] In an exemplary embodiment of the present disclosure, the first structural layer is a flexible cover plate, and the second structural layer is a flexible array substrate, forming a flexible cover plate, including:

[0109] forming a second ultra-thin glass layer, wherein the thickness of the second ultra-thin glass layer in the curling area is less than the thickness of the second ultra-thin glass layer in the flattening area and the strain accumulation area;

[0110] forming a second polymer film on one side of the second ultra-thin glass layer;

[0111] forming a second hardened layer on a side of the second polymer film facing away from the second ultra-thin glass layer;

[0112] Attaching the flexible cover plate to a side of the first adhesive layer facing away from the flexible array substrate comprises:

[0113] The side of the second ultra-thin glass layer facing away from the second polymer film is attached to the side of the first adhesive layer facing away from the flexible array substrate.

[0114] In an exemplary embodiment of the present disclosure,

[0115] A concave structure located in the curling area is formed on a side of the second ultra-thin glass layer facing the second polymer film.

[0116] In an exemplary embodiment of the present disclosure, a concave structure located in the curling area is formed on a side of the second ultra-thin glass layer facing away from the second polymer film;

[0117] Forming the flexible cover also includes:

[0118] forming a third polymer film on a side of the second ultra-thin glass layer facing away from the second polymer film;

[0119] Attaching the flexible cover plate to a side of the first adhesive layer facing away from the flexible array substrate comprises:

[0120] The side of the third polymer film facing away from the second ultra-thin glass layer is attached to the side of the first adhesive layer facing away from the flexible array substrate.

[0121] The method for manufacturing the rollable display panel provided by the present exemplary embodiment has been described in detail in the above description and will not be repeated here.

[0122] An exemplary embodiment of the present disclosure further provides a display device, which includes the above-mentioned display panel. The display device can be a display device such as a mobile phone, a tablet computer, or a television.

[0123] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing what is disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the generality of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are to be considered merely exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.

[0124] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A rollable display panel, wherein the rollable display panel can be rolled along a preset rolling radius, characterized in that: include: A first structural layer, a second structural layer, a first bonding layer stacked between the first structural layer and the second structural layer, and a curling area, a strain accumulation area, and a flattening area sequentially distributed along a curling direction; Wherein, the first structural layer is a flexible cover plate, the second structural layer is a flexible array substrate, and the thickness of the first adhesive layer located in the strain accumulation area is greater than the thickness of the first adhesive layer located in the curling area and the flattening area; The elastic modulus of at least one of the first structural layer and the second structural layer located in the strain accumulation area is smaller than the elastic modulus of at least one of the first structural layer and the second structural layer located in the curling area and the flattening area.

2. The rollable display panel according to claim 1, characterized in that: The elastic modulus of the flexible cover plate located in the strain accumulation area is smaller than the elastic modulus of the flexible cover plate located in the curling area and the flattening area.

3. The rollable display panel according to claim 1, characterized in that: The first structural layer is a flexible cover plate, the second structural layer is a flexible array substrate, and the flexible cover plate includes: A first ultra-thin glass layer, located on a side of the first adhesive layer away from the flexible array substrate; A first polymer film, located on a side of the first ultra-thin glass layer away from the flexible array substrate; A first hardening layer, located on a side of the first polymer film away from the flexible array substrate; Wherein, the side of the first ultra-thin glass layer facing the first polymer film is chamfered at its curled side edge.

4. The rollable display panel according to claim 3, characterized in that: The chamfer is a curved chamfer or a flat chamfer.

5. The rollable display panel according to claim 3, characterized in that: The chamfer extends to a side of the first ultra-thin glass layer facing away from the first polymer film.

6. The rollable display panel according to claim 3, characterized in that: The flexible cover plate further comprises: The second adhesive layer is located between the first ultra-thin glass layer and the first polymer film.

7. The rollable display panel according to claim 1, characterized in that: The first structural layer is a flexible cover plate, the second structural layer is a flexible array substrate, and the flexible cover plate includes: A second ultra-thin glass layer is located on a side of the first bonding layer away from the flexible array substrate; A second polymer film, located on a side of the second ultra-thin glass layer away from the flexible array substrate; A second hardening layer, located on a side of the second polymer film away from the flexible array substrate; The thickness of the second ultra-thin glass layer in the curling area is smaller than the thickness of the second ultra-thin glass layer in the flattening area and the strain accumulation area.

8. The rollable display panel according to claim 7, characterized in that: A concave structure located in the curling area is formed on a side of the second ultra-thin glass layer facing the second polymer film.

9. The rollable display panel according to claim 8, characterized in that: The flexible cover plate further comprises: a third polymer film, located on a side of the second ultra-thin glass layer facing the flexible array substrate; A concave structure located in the curling area is formed on a side of the second ultra-thin glass layer facing the third polymer film.

10. The rollable display panel according to claim 7, characterized in that: The side of the second ultra-thin glass layer facing the second polymer film is chamfered at its curled side edge.

11. A method for manufacturing a rollable display panel, characterized in that: The rollable display panel can be rolled along a preset rolling radius, and the rollable display panel includes: a rolling area, a strain accumulation area, and a flattening area sequentially distributed along the rolling direction. The manufacturing method includes: providing a second structural layer; Forming a first bonding layer on one side of the second structural layer, wherein the thickness of the first bonding layer in the strain accumulation area is greater than the thickness of the first bonding layer in the curling area and the flattening area; forming a first structural layer, and attaching the first structural layer to a side of the first adhesive layer facing away from the second structural layer; The first structural layer is a flexible cover plate, the second structural layer is a flexible array substrate, and at least one of the first structural layer and the second structural layer has an elastic modulus located in the strain accumulation area that is smaller than the elastic modulus located in the curling area and the flattening area.

12. The method for manufacturing a rollable display panel according to claim 11, characterized in that: The first structural layer is a flexible cover plate, and the second structural layer is a flexible array substrate, forming a flexible cover plate, including: forming a resin material layer; Curing different positions of the resin material layer to different degrees to form the resin material layer into the flexible cover plate; The curing degree of the flexible cover plate in the strain accumulation area is lower than that in the curling area and the flattening area.

13. The method for manufacturing a rollable display panel according to claim 11, characterized in that: The first structural layer is a flexible cover plate, and the second structural layer is a flexible array substrate, forming a flexible cover plate, including: forming a first ultra-thin glass layer, wherein a first side surface of the first ultra-thin glass layer is chamfered at its curled side edge; forming a first polymer film on one side of the first ultra-thin glass layer; forming a first hardened layer on a side of the first polymer film facing away from the first ultra-thin glass layer; Attaching the flexible cover plate to a side of the first adhesive layer facing away from the flexible array substrate comprises: The side of the first ultra-thin glass layer facing away from the first polymer film is attached to the side of the first adhesive layer facing away from the flexible array substrate.

14. The method for manufacturing a rollable display panel according to claim 13, characterized in that: Forming a first ultra-thin glass layer includes: providing a layer of glass material; Performing a thinning process on the glass material layer; The thinned glass material layer is strengthened to form the first ultra-thin glass layer.

15. The method for manufacturing a rollable display panel according to claim 11, characterized in that: The first structural layer is a flexible cover plate, and the second structural layer is a flexible array substrate, forming a flexible cover plate, including: forming a second ultra-thin glass layer, wherein the thickness of the second ultra-thin glass layer in the curling area is less than the thickness of the second ultra-thin glass layer in the flattening area and the strain accumulation area; forming a second polymer film on one side of the second ultra-thin glass layer; forming a second hardened layer on a side of the second polymer film facing away from the second ultra-thin glass layer; Attaching the flexible cover plate to a side of the first adhesive layer facing away from the flexible array substrate comprises: The side of the second ultra-thin glass layer facing away from the second polymer film is attached to the side of the first adhesive layer facing away from the flexible array substrate.

16. The method for manufacturing a rollable display panel according to claim 15, characterized in that: A concave structure located in the curling area is formed on a side of the second ultra-thin glass layer facing the second polymer film.

17. The method for manufacturing a rollable display panel according to claim 16, characterized in that: A concave structure located in the curling area is formed on a side of the second ultra-thin glass layer facing away from the second polymer film; Forming the flexible cover also includes: forming a third polymer film on a side of the second ultra-thin glass layer facing away from the second polymer film; Attaching the flexible cover plate to a side of the first adhesive layer facing away from the flexible array substrate comprises: The side of the third polymer film facing away from the second ultra-thin glass layer is attached to the side of the first adhesive layer facing away from the flexible array substrate.

18. A display device, characterized in that: A display panel comprising any one of claims 1 to 10.

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