Cover plate assembly and folding display module

Abstract

The application relates to a cover plate assembly and a folding display module. The cover plate assembly is arranged on the display side of a flexible display panel. The cover plate assembly comprises a cover plate layer and a protection layer. The protection layer comprises a first protection layer, a second protection layer and a first adhesive layer. The first protection layer is arranged on the side close to the cover plate layer. The second protection layer is arranged on the side away from the cover plate layer of the first protection layer. The first adhesive layer is arranged between the first protection layer and the second protection layer and adheres the first protection layer and the second protection layer. At least at the position corresponding to the bending area, the protection layer forms a pattern area. On the side surface of the second protection layer facing the first adhesive layer in the pattern area, a plurality of first accommodating grooves are arranged. Part of the first adhesive layer extends towards the first accommodating grooves, forming a first adhesive part filling the first accommodating grooves. Thus, the crease appearance of the folding display module is improved.

Description

Technical Field

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

[0002] With the development and iteration of science and technology, OLED (Organic Light-Emitting Diode, Chinese abbreviation: Organic Electroluminescence) flexible device displays have been widely used in foldable display modules due to their excellent bending properties. In order to ensure the overall bending properties of the screen, a cover material with good elongation at break, such as transparent polyimide (CPI) / polyethylene terephthalate (PET), is required to achieve the bending and protection of the display device. However, after bending, the bending area on the foldable display module will form obvious creases due to the deformation of the cover material, thereby affecting the appearance of the foldable display module product. Summary of the Invention

[0003] The embodiments of the present application provide a cover assembly and a folding display module to solve the problem of poor visual perception of creases in the folding display module.

[0004] To achieve the above objectives, according to a first aspect of the present application, a cover plate assembly is provided, which is disposed on the display side of a flexible display panel, wherein the flexible display panel has a bending region. The cover plate assembly includes a cover plate layer and a protective layer, wherein the protective layer is located on a side of the cover plate layer facing away from the flexible display panel, and the protective layer includes:

[0005] A first protective layer is provided close to one side of the cover layer;

[0006] a second protective layer, the second protective layer being arranged on a side of the first protective layer facing away from the cover layer; and

[0007] a first adhesive layer, the first adhesive layer being disposed between the first protective layer and the second protective layer and adhering the first protective layer and the second protective layer;

[0008] In which, the protective layer forms a pattern area at least at the position corresponding to the bending area. In the pattern area, a plurality of first receiving grooves are provided on the surface of the second protective layer facing the first adhesive layer, and a portion of the first adhesive layer extends toward the first receiving groove to form a first adhesive portion filling the first receiving groove.

[0009] In one embodiment, in the thickness direction of the cover plate assembly, the thickness of the second protective layer is set to T1, the depth of the first receiving groove is set to T2, and T2 is less than 1 / 2T1.

[0010] In one embodiment, the protective layer further includes a second adhesive layer, which is disposed between the first protective layer and the cover layer and adheres the first protective layer and the cover layer;

[0011] In the pattern area, a plurality of second receiving grooves are provided on a side surface of the first protective layer facing the first adhesive layer and / or a side surface of the first protective layer facing the second adhesive layer. Correspondingly, the first adhesive layer and / or the second adhesive layer extend toward the second receiving groove and form a second adhesive portion filling the second receiving groove.

[0012] In one embodiment, in the thickness direction of the cover assembly, the second accommodating groove and the first accommodating groove are staggered.

[0013] In one embodiment, in the thickness direction of the cover plate assembly, the depth of the second accommodating groove is smaller than the depth of the first accommodating groove.

[0014] In one embodiment, the protective layer further includes a first hardening layer, and the first hardening layer is arranged on a side of the second protective layer away from the first protective layer;

[0015] A plurality of hemispherical protrusions are protruding from a surface of the first hardened layer on a side facing away from the second protective layer, and the plurality of hemispherical protrusions are arranged in an array.

[0016] In one embodiment, the sizes of the plurality of hemispherical protrusions are the same; and / or,

[0017] The surface roughness of the hemispherical protrusion is set to be less than 0.025 μm.

[0018] In one embodiment, the protective layer also includes a second hardened layer and a third hardened layer, the second hardened layer is arranged on the side of the first hardened layer away from the second protective layer, and the third hardened layer is arranged on the side of the second hardened layer away from the first hardened layer, and the refractive index of the third hardened layer is smaller than the refractive index of the second hardened layer.

[0019] In one embodiment, the cover layer includes a cover and an encapsulation layer, the encapsulation layer is located on a side of the cover facing the flexible display panel, and a groove is provided on a side of the cover facing the encapsulation layer at a position corresponding to the bending area, and a portion of the encapsulation layer extends into the groove to form a filling portion that fills the groove;

[0020] Wherein, the orthographic projection of the groove on the protective layer is located within the range of the pattern area.

[0021] According to a second aspect of the present application, a foldable display module is provided, comprising:

[0022] Flexible display panels;

[0023] The above-mentioned cover plate assembly is arranged on the display side of the flexible display panel; and

[0024] The third adhesive layer is disposed between the flexible display panel and the cover assembly, and adheres the flexible display panel and the cover assembly.

[0025] In the cover plate assembly of the embodiment of the present application, the cover plate assembly includes a cover plate layer and a protective layer, and the first protective layer and the second protective layer in the protective layer are adhered and fixed by the first adhesive layer; the first protective layer is arranged close to the cover plate layer; in the prior art, in order to ensure that the folding display module has good front impact resistance, the second protective layer is usually arranged to have a large elastic modulus, so that after the folding display module is bent, the first adhesive layer has a large deformation in the bending area, thereby forming a more obvious crease on the folding display module; in the present application, a plurality of first accommodating grooves are arranged on the surface of the second protective layer facing the first adhesive layer, and the first adhesive layer is provided with a plurality of first accommodating grooves. Part of the layer extends toward the first accommodating groove and forms a first bonding portion filling the first accommodating groove; the provision of multiple first accommodating grooves can reduce the elastic modulus of the second protective layer, and when the folding display module is bent, the deformation of the second protective layer increases, and the rebound force in the bending area decreases, and the force on the first adhesive layer in the bending area is reduced, thereby reducing the deformation of the first adhesive layer in the bending area, thereby improving the crease appearance of the folding display module; and the cooperation of the first bonding portion and the first accommodating groove can increase the contact area between the first adhesive layer and the second protective layer, and increase the adhesion stability of the first adhesive layer and the second protective layer.

[0026] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0028] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0029] Figure 1 A schematic diagram of a membrane layer of a cover plate assembly in the prior art;

[0030] Figure 2 A schematic diagram of the membrane layer of the cover plate assembly provided in an embodiment of the present application;

[0031] Figure 3 for Figure 2 Schematic diagram of the first film layer of the protective layer;

[0032] Figure 4 for Figure 2 Schematic diagram of the second film layer of the protective layer;

[0033] Figure 5 for Figure 2 Schematic diagram of the third type of film layer of the protective layer;

[0034] Figure 6 for Figure 2 Schematic diagram of the fourth type of film layer of the protective layer;

[0035] Figure 7 for Figure 2 Schematic diagram of the fifth type of film layer of the protective layer;

[0036] Figure 8 for Figure 2 Schematic diagram of the sixth film layer of the protective layer;

[0037] Figure 9 Schematic diagram of the film layer of the foldable display module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0039] The present invention provides a cover assembly 100 and a foldable display module. Detailed descriptions are provided below. It should be noted that the order in which the following embodiments are described does not limit the preferred order of the embodiments.

[0040] The foldable display module provided in the embodiments of the present disclosure is a foldable display product. The foldable display module can have a teardrop-shaped folding configuration, but is not limited thereto. The display panel of the foldable display module is configured as a flexible display panel; the flexible display panel can be, but is not limited to, an LCD panel. The side of the flexible display panel facing the light-emitting direction is the display side, which is used to display images. The back side of the flexible display panel is opposite the display side.

[0041] In the first aspect, the present invention provides a cover plate assembly 100. Figure 2 and Figure 9The cover assembly 100 is arranged on the display side 201 of the flexible display panel 200. The flexible display panel 200 has a bending area A. The cover assembly 100 includes a cover layer 1 and a protective layer 2. The protective layer 2 is located on the side of the cover layer 1 facing away from the flexible display panel 200. The protective layer 2 includes a first protective layer 21, a second protective layer 22, and a first adhesive layer 23. The first protective layer 21 is arranged close to the side of the cover layer 1; the second protective layer 22 is arranged on the side of the first protective layer 21 facing away from the cover layer 1. The first adhesive layer 23 is arranged between the first protective layer 21 and the second protective layer 22, and adheres the first protective layer 21 and the second protective layer 22; wherein, the protective layer 2 forms a pattern area B at least at a position corresponding to the bending area A, and in the pattern area B, a plurality of first receiving grooves 221 are provided on a side surface of the second protective layer 22 facing the first adhesive layer 23, and a portion of the first adhesive layer 23 extends toward the first receiving groove 221, and forms a first adhesive portion 231 filling the first receiving groove 221.

[0042] In order to ensure the bending properties of the foldable display module 1000, a cover plate with a high elongation at break is required. This protects the display panel while ensuring good bending performance. Typically, the first protective layer 21 is made of CPI (Colorless Polyimide) or PET (Polyethylene Terephthalate), and the second protective layer 22 is made of CPI (Colorless Polyimide) or PET (Polyethylene Terephthalate).

[0043] In the existing cover plate assembly 100 ′, please refer to Figure 1In the protective layer 2', the stacked first protective layer 21' and the second protective layer 22' are adhered and fixed by a first adhesive layer 23'; the first protective layer 21' is arranged on the display side of the flexible display panel, and the second protective layer 22' is arranged on the side of the first protective layer 21' away from the flexible display panel. The first protective layer 21' is adhered to the flexible display panel by a second adhesive layer 24'. In order to ensure that the folding display module has good frontal impact resistance, the second protective layer 22' is usually set to have a large elastic modulus. In this way, when the folding display module is bent, the deformation of the second protective layer 22' is small, and the rebound force in the bending area A' is large. In the bending area A', the second protective layer 22' exerts a large force on the first adhesive layer 23', so that the first adhesive layer 23' has a large deformation in the bending area A', thereby forming a more obvious crease on the folding display module.

[0044] In the present application, the cover assembly 100 includes a cover layer 1 and a protective layer 2, wherein the first protective layer 21 and the second protective layer 22 in the protective layer 2 are adhered and fixed by the first adhesive layer 23; the first protective layer 21 is arranged close to the cover layer 1; at the same time, a pattern area B is formed on the protective layer 2 at a position corresponding to the bending area A, and within the pattern area B, a plurality of first receiving grooves 221 are provided on a side surface of the second protective layer 22 facing the first adhesive layer 23, and a portion of the first adhesive layer 23 extends toward the first receiving groove 221, and forms a first adhesive portion 231 that fills the first receiving groove 221; a plurality of the first The setting of the accommodating groove 221 can reduce the elastic modulus of the second protective layer 22. When the folding display module 1000 is bent, the deformation of the second protective layer 22 increases, and the rebound force in the bending area A decreases, and the force on the first adhesive layer 23 in the bending area A is reduced, so that the deformation of the first adhesive layer 23 in the bending area A is reduced, thereby improving the crease appearance of the folding display module 1000; and the cooperation between the first adhesive portion 231 and the first accommodating groove 221 can increase the contact area between the first adhesive layer 23 and the second protective layer 22, and increase the adhesion stability between the first adhesive layer 23 and the second protective layer 22.

[0045] It can be seen that the second protective layer 22 is arranged on the side of the first protective layer 21 facing away from the cover plate layer 1. To avoid the impact of the provision of multiple first receiving grooves 221 on the strength of the second protective layer 22, the thickness of the second protective layer 22 is set to T1, and the depth of the first receiving grooves 221 is set to T2 in the thickness direction F1 of the cover plate assembly 100, and T2 is less than 1 / 2T1. In other words, the depth of the first receiving grooves 221 does not exceed half of the total thickness of the second protective layer 22. This ensures the strength of the second protective layer 22, thereby ensuring that the foldable display module 1000 has good frontal impact resistance.

[0046] See also Figure 3 In the first embodiment of the present application, a plurality of first receiving grooves 221 are provided on a surface of the second protective layer 22 facing the first adhesive layer 23, and a portion of the first adhesive layer 23 extends toward the first receiving groove 221 and forms a first adhesive portion 231 filling the first receiving groove 221.

[0047] In the first embodiment, the first protective layer 21 and the second protective layer 22 are adhered to each other by providing the first adhesive layer 23; a plurality of first receiving grooves 221 are provided on the surface of the second protective layer 22 facing the first adhesive layer 23. After the first protective layer 21 and the second protective layer 22 are attached to each other, the squeezed first adhesive layer 23 will partially extend into the first receiving groove 221 to form a first adhesive portion 231 filling the first receiving groove 221; in this way, the elastic modulus of the second protective layer 22 can be reduced. When the folding display module 1000 is bent, the deformation of the second protective layer 22 increases, and the rebound force in the bending area A decreases, and the force acting on the first adhesive layer 23 in the bending area A is reduced, so that the deformation of the first adhesive layer 23 in the bending area is reduced, thereby improving the crease appearance of the folding display module 1000.

[0048] At the same time, the structure of the first accommodating groove 221 and the first adhesive portion 231 can increase the contact area between the first adhesive layer 23 and the second protective layer 22, and increase the adhesion stability between the first adhesive layer 23 and the second protective layer 22; and, the squeezed first adhesive layer 23 will partially extend into the first accommodating groove 221, thereby forming the first adhesive portion 231. Therefore, without adding the existing film layer, the formation of the first adhesive portion 231 can be achieved, thereby simplifying the manufacturing process of the cover assembly 100.

[0049] In other embodiments, the protective layer 2 also includes a second adhesive layer 24, which is arranged between the first protective layer 21 and the cover layer 1, and adheres the first protective layer 21 to the cover layer 1; in the pattern area B, a second receiving groove 211 can be set on the side surface of the first protective layer 21 facing the first adhesive layer 23, and a second receiving groove 211 can be set on the side surface of the first protective layer 21 facing the second adhesive layer 24, and a second receiving groove 211 can also be set on the side surface of the first protective layer 21 facing the first adhesive layer 23, and on the side surface of the first protective layer 21 facing the first adhesive layer 23.

[0050] See also Figure 4 In the second embodiment of the present application, a second receiving groove 211 is provided on a side surface of the first protective layer 21 facing the first adhesive layer 23; a portion of the first adhesive layer 23 extends toward the second receiving groove 211 and forms a second adhesive portion 232 filling the second receiving groove 211.

[0051] In the second embodiment, the difference from the first embodiment is that the second accommodating groove 211 and the first accommodating groove 221 are respectively provided on the opposite side surfaces of the first protective layer 21 and the second protective layer 22; the provision of the first accommodating groove 221 can reduce the elastic modulus of the second protective layer 22; the provision of the second accommodating groove 211 can reduce the elastic modulus of the first protective layer 21; when the folding display module 1000 is bent, the deformation of the second protective layer 22 and the first protective layer 21 are both increased, and the rebound force in the bending area A is reduced, so that the force of the second protective layer 22 and the first protective layer 21 on the first adhesive layer 23 in the bending area A is reduced, thereby further reducing the deformation of the first adhesive layer 23 in the bending area A, and further improving the crease appearance of the folding display module 1000.

[0052] At the same time, the structural design of the first accommodating groove 221 and the first adhesive portion 231, and the second accommodating groove 211 and the second adhesive portion 232 can increase the contact area between the first adhesive layer 23 and the second protective layer 22 and the first protective layer 21, thereby increasing the adhesion stability of the first adhesive layer 23 to the second protective layer 22 and the first protective layer 21; and, the squeezed first adhesive layer 23 will partially extend into the first accommodating groove 221 and the second accommodating groove 211, thereby forming the first adhesive portion 231 and the second adhesive portion 232. Therefore, without adding the existing film layer, the formation of the first adhesive portion 231 and the second adhesive portion 232 can be achieved, thereby simplifying the manufacturing process of the cover assembly 100.

[0053] Following the first and second embodiments, the second receiving groove 211 and the first receiving groove 221 are respectively provided on the opposite side surfaces of the first protective layer 21 and the second protective layer 22, and an optically transparent adhesive is provided between the first protective layer 21 and the second protective layer 22. After the first protective layer 21 and the second protective layer 22 are bonded together, the optically transparent adhesive is squeezed and overflows into the first receiving groove 221 and the second receiving groove 211, thereby filling the first receiving groove 221 and the second receiving groove 211; then, the adhesive is cured by ultraviolet (UV) curing, thermal curing, or dual curing (UV curing + thermal curing); thereby, the first adhesive layer 23, the first adhesive portion 231, and the second adhesive portion 232 are formed.

[0054] This application does not impose any specific restrictions on the type of the first adhesive layer 23. The material of the first adhesive layer 23 needs to have good transparency, leveling properties, optical properties, and bonding strength. Preferably, the material of the first adhesive layer 23 is set to OCR (Optically Clear Resin), which has good leveling properties and can facilitate OCR filling in the first receiving groove 221 and the second receiving groove 211.

[0055] Furthermore, the first protective layer 21 is adhered to the cover layer 1 through the second adhesive layer 24 , thereby achieving a stable connection between the protective layer 2 and the cover layer 1 .

[0056] This application does not impose any specific restrictions on the type of the second adhesive layer 24. The material of the second adhesive layer 24 needs to have good light transmittance, optical properties, and bonding strength. In the first and second embodiments, the material of the second adhesive layer 24 is set to OCA (Full English Name: Optically Clear Adhesive, Chinese abbreviation: Optical Clear Adhesive), which has good light transmittance, optical properties, and bonding strength. The OCA is set on the first protective layer 21. After the first protective layer 21 and the cover layer 1 are bonded, they are cured by ultraviolet (UV) curing, thermal curing, or dual curing (UV curing + thermal curing) to form the second adhesive layer 24. In this way, the adhesion stability of the protective layer 2 and the cover layer 1 can be improved.

[0057] See also Figure 5 In the third embodiment of the present application, a plurality of second receiving grooves 211 are provided on one side surface of the first protective layer 21 facing the second adhesive layer 24; a portion of the second adhesive layer 24 extends toward the second receiving groove 211 and forms a second adhesive portion 241 filling the second receiving groove 211.

[0058] In the third embodiment, the difference from the second embodiment is that the second receiving groove 211 is arranged on the side of the first protective layer 21 facing the second adhesive layer 24; the first protective layer 21 and the cover layer 1 are adhered to each other through the second adhesive layer 24. After the first protective layer 21 and the cover layer 1 are attached, the squeezed second adhesive layer 24 will partially extend into the second receiving groove 211, forming the second adhesive portion 241 filling the second receiving groove 211.

[0059] The setting of the first accommodating groove 221 can reduce the elastic modulus of the second protective layer 22; the setting of the second accommodating groove 211 can reduce the elastic modulus of the first protective layer 21; when the folding display module 1000 is bent, the deformation of the second protective layer 22 increases, and the rebound force in the bending area A decreases, and the force of the second protective layer 22 on the first adhesive layer 23 in the bending area is reduced, thereby reducing the deformation of the first adhesive layer 23 in the bending area A; at the same time, the deformation of the first protective layer 21 increases, and the rebound force in the bending area A decreases, and the force of the first protective layer 21 on the second adhesive layer 24 in the bending area A is reduced, thereby reducing the deformation of the second adhesive layer 24 in the bending area A; in this way, the deformation of the first adhesive layer 23 and the second adhesive layer 24 in the bending area A can be reduced at the same time, further improving the crease appearance of the folding display module 1000.

[0060] At the same time, the structure of the first accommodating groove 221 and the first adhesive portion 231 can increase the contact area between the first adhesive layer 23 and the second protective layer 22, thereby increasing the adhesion stability of the first adhesive layer 23 and the second protective layer 22; the structure of the second accommodating groove 211 and the second adhesive portion 232 can increase the contact area between the second adhesive layer 24 and the first protective layer 21, thereby increasing the adhesion stability of the second adhesive layer 24 and the first protective layer 21; and, the squeezed first adhesive layer 23 will partially extend to the first accommodating groove 221 to form the first adhesive portion 231, and the squeezed second adhesive layer 24 will partially extend to the second accommodating groove 211 to form the second adhesive portion 241. Therefore, without adding the existing film layer, the formation of the first adhesive portion 231 and the second adhesive portion 232 can be achieved, simplifying the manufacturing process of the cover assembly 100.

[0061] It can be seen that since the squeezed second adhesive layer 24 partially extends into the second receiving groove 211 to form the second adhesive portion 241, the second adhesive layer 24 also needs to have good leveling properties. Unlike the second embodiment, in the third embodiment, the material of the second adhesive layer 24 is set to OCR (Optically Clear Resin), which has good leveling properties and can facilitate OCR filling in the second receiving groove 211. It is then cured by one of the following methods: ultraviolet (UV) curing, thermal curing, or dual curing (UV curing + thermal curing); thereby forming the second adhesive layer 24 and the second adhesive portion 241.

[0062] Following the second and third embodiments described above, this application does not impose any specific restrictions on the positional relationship between the second receiving groove 211 and the first receiving groove 221. In one embodiment, in the thickness direction F1 of the cover assembly 100, the second receiving groove 211 and the first receiving groove 221 are aligned.

[0063] See also Figure 6 In the fourth embodiment of the present application, in the thickness direction F1 of the cover assembly 100, the second accommodating groove 211 and the first accommodating groove 221 are staggered; correspondingly, the first adhesive portion 231 and the second adhesive portion 232 (241) are staggered.

[0064] In the fourth embodiment, the second adhesive portions 232 on both sides of the first adhesive layer 23 are staggered with the first adhesive portion 231, or the first adhesive portion 231 on the first adhesive layer 23 and the second adhesive portion 241 on the second adhesive layer 24 are staggered; in this way, when the folding display module 1000 is bent, the first protective layer 21 and the second protective layer 22 exert force on the first adhesive layer 23 in the bending area A at different positions, so that the force at various locations of the first adhesive layer 23 is more uniform, and the deformation of the first adhesive layer 23 in the bending area A is also more uniform, avoiding the first adhesive layer 23 from having more obvious creases due to its larger local deformation.

[0065] As mentioned above, the second accommodating groove 211 is set on the first protective layer 21, and the first accommodating groove 221 is set on the second protective layer 22; it can be known that in order to ensure that the folding display module 1000 has good frontal impact resistance, the elastic modulus of the second protective layer 22 is usually set to be larger, and the elastic modulus of the first protective layer 21 is smaller, so that when the folding display module 1000 is bent, the first protective layer 21 has a larger deformation ability than the second protective layer 22; therefore, the elastic modulus of the second protective layer 22 is reduced to a greater extent, and the elastic modulus of the first protective layer 21 is reduced to a smaller extent; thus, in the thickness direction F1 of the cover assembly 100, the depth of the second accommodating groove 211 is set to be smaller than the depth of the first accommodating groove 221.

[0066] The present application does not impose any specific restrictions on the shapes of the first accommodating groove 221 and the second accommodating groove 211. The cross-sectional shape of the first accommodating groove 221 includes circular, elliptical, triangular or square; the cross-sectional shape of the second accommodating groove 211 includes circular, elliptical, triangular or square.

[0067] Furthermore, the shapes of the first accommodating groove 221 and the second accommodating groove 211 may be the same or different; the sizes of the first accommodating groove 221 and the second accommodating groove 211 may be the same or different; the design may be based on the specific product and no specific restrictions are imposed here.

[0068] See also Figure 7 and Figure 8 The cover plate assembly 100 also includes a first hardened layer 25, which is arranged on the side of the second protective layer 22 away from the first protective layer 21; a plurality of hemispherical protrusions 251 are protruding from the surface of the first hardened layer 25 away from the second protective layer 22, and the plurality of hemispherical protrusions 251 are arranged in an array.

[0069] In this embodiment, the second protective layer 22 is protected by providing the first hardened layer 25, and the folding display module 1000 can have better frontal impact resistance; and in the process of forming the first hardened layer 25, a hardening coating is coated on the side of the second protective layer 22 away from the first protective layer 21, and the hardened coating is cured to form the first hardened layer 25, and the first hardened layer 25 is subjected to nano-shaping and roughening treatment. Nano-shaping and roughening is a technology that changes the surface properties of a material by manufacturing a nano-scale concave-convex structure on the surface of the material. By controlling the shape and arrangement of the concave-convex structure, precise control of the reflection, refraction and scattering of light can be achieved, and it is suitable for manufacturing optical coatings, photonic crystals, etc.; in this way, a plurality of hemispherical protrusions 251 can be protruded on the surface of the first hardened layer 25 away from the second protective layer 22, and the plurality of hemispherical protrusions 251 are arranged in an array.

[0070] After passing through the first hardened layer 25, the light will be diffusely reflected due to the structure of the multiple hemispherical protrusions 251, so that the light is evenly distributed on the surface of the folding display module 1000, reducing local bright spots and dark spots, and thus making the display brightness of the folding display module 1000 more uniform; at the same time, the light is diffusely reflected after passing through the first hardened layer 25, which can reduce strong direct light, reduce glare, and enhance user experience; and can make the light evenly distributed at different angles, improve the wide viewing angle performance of the folding display module 1000, reduce viewing angle dependence, and enable users to obtain consistent display effects when viewing from different angles.

[0071] In order to further avoid the generation of local bright spots and dark spots on the surface of the folding display module 1000; in the present application, the multiple hemispherical protrusions 251 are of the same size; in this way, the multiple hemispherical protrusions 251 on the first hardening layer 25 are evenly distributed and of the same size, thereby improving the uniformity of diffuse reflection of light after passing through the first hardening layer 25, and the scattering intensity of light in all directions is basically the same, without obvious hot spots or dark areas, further making the light more evenly distributed on the surface of the folding display module 1000.

[0072] In the present application, the surface roughness of the hemispherical protrusion 251 is set to be less than 0.025μm; in this way, the surface of the hemispherical protrusion 251 is smooth enough to improve the uniformity of diffuse reflection of light after passing through the first hardened layer 25, and the scattering intensity of light in all directions is basically the same, without obvious hot spots or dark areas, further making the light more evenly distributed on the surface of the folding display module 1000.

[0073] It should be noted that the above two technical features can be set selectively or simultaneously. In one embodiment, the above two technical features are set simultaneously. In this way, the diffuse reflection uniformity of light after passing through the first hardened layer 25 can be improved by simultaneously setting multiple hemispherical protrusions 251 that are evenly distributed and of uniform size and the surface of the hemispherical protrusions 251 is sufficiently smooth.

[0074] In addition, the cover plate assembly 100 also includes a second hardened layer 26 and a third hardened layer 27. The second hardened layer 26 is arranged on the side of the first hardened layer 25 away from the second protective layer 22, and the third hardened layer 27 is arranged on the side of the second hardened layer 26 away from the first hardened layer 25. The refractive index of the third hardened layer 27 is greater than the refractive index of the second hardened layer 26.

[0075] A hardened coating is applied to the surface of the first hardened layer 25 on the side facing away from the second protective layer 22, and the hardened coating is cured to form the second hardened layer 26. A hardened coating is applied to the surface of the second hardened layer 26 on the side facing away from the first hardened layer 25, and the hardened coating is cured to form the third hardened layer 27. The refractive index of the third hardened layer 27 is lower than that of the second hardened layer 26, so that the second hardened layer 26 and the third hardened layer 27 form an anti-reflection coating, thereby improving light transmittance. Furthermore, the first hardened layer 25, the second hardened layer 26, and the third hardened layer 27 are applied and cured layer by layer, so that the first hardened layer 25, the second hardened layer 26, and the third hardened layer 27 are integrated.

[0076] The present application does not impose any specific limitation on the refractive index of the second hardened layer 26 . The refractive index of the second hardened layer 26 is set in the range of 1.8 to 2.2 and can be designed according to the actual product.

[0077] Likewise, the present application does not impose any specific restrictions on the refractive index of the third hardened layer 27 . The refractive index of the third hardened layer 27 is set to be in the range of 1.4 to 1.6 and can be designed according to the actual product.

[0078] See also Figure 2In one embodiment, the cover layer 1 includes a cover 11 and an encapsulation layer 12, the encapsulation layer 12 is located on the side of the cover 11 facing the flexible display panel 200, and at a position corresponding to the bending area A, a groove 111 is provided on the side of the cover 11 facing the encapsulation layer 12, and a portion of the encapsulation layer 12 extends into the groove 111 to form a filling portion 121 that fills the groove 111; wherein, the orthographic projection of the groove 111 on the protective layer 2 is located within the pattern area B; the setting of the groove 111 can ensure the safety of the cover 11 after bursting, and the setting of the groove 111 and the filling portion 121 can reduce the risk of the cover layer 1 and the flexible display panel 200 falling off; and setting the orthographic projection of the groove 111 on the protective layer 2 within the pattern area B can further reduce the elastic modulus of the entire cover assembly 100 at the bending area A, thereby further improving the crease appearance of the folding display module 1000.

[0079] In a second aspect, the present invention provides a foldable display module 1000. Figure 9 The folding display module 1000 includes a flexible display panel 200, a cover assembly 100 and a third adhesive layer 300; the flexible display panel 200; the cover assembly 100 is arranged on the display side 201 of the flexible display panel 200; the third adhesive layer 300 is arranged between the flexible display panel 200 and the cover assembly 100, and adheres the flexible display panel 200 and the cover assembly 100.

[0080] It should be noted that the cover assembly 100 is set as the above-mentioned cover assembly 100, that is, the cover assembly 100 includes all the technical features of the above-mentioned cover assembly 100, and the folding display module 1000 includes all embodiments of the above-mentioned cover assembly 100, and also has all the technical effects of the above-mentioned embodiments, which will not be repeated here one by one.

[0081] The cover assembly 100 includes a first protective layer 21 and a second protective layer 22, and a first adhesive layer 23 that adheres the first protective layer 21 and the second protective layer 22; a plurality of first receiving grooves 221 are provided on the surface of the second protective layer 22 facing the first adhesive layer 23. After the first protective layer 21 and the second protective layer 22 are adhered, the squeezed first adhesive layer 23 will partially extend into the first receiving groove 221 to form a first adhesive portion 231 that fills the first receiving groove 221; in this way, the elastic modulus of the second protective layer 22 can be reduced. When the folding display module 1000 is bent, the deformation of the second protective layer 22 increases, and the rebound force in the bending area A decreases, and the force acting on the first adhesive layer 23 in the bending area A is reduced, so that the deformation of the first adhesive layer 23 in the bending area is reduced, thereby improving the crease appearance of the folding display module 1000.

[0082] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0083] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0084] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0085] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A cover assembly, arranged on the display side of a flexible display panel, wherein the flexible display panel has a bending area, characterized in that: The cover plate assembly includes a cover plate layer and a protective layer, wherein the protective layer is located on a side of the cover plate layer facing away from the flexible display panel, and the protective layer includes: A first protective layer is provided close to one side of the cover layer; a second protective layer, the second protective layer being arranged on a side of the first protective layer facing away from the cover layer; and a first adhesive layer, the first adhesive layer being disposed between the first protective layer and the second protective layer and adhering the first protective layer and the second protective layer; The protective layer forms a pattern area at least at a position corresponding to the bending area. Within the pattern area, a plurality of first receiving grooves are provided on a surface of the second protective layer facing the first adhesive layer. Portions of the first adhesive layer extend into the first receiving grooves to form first adhesive portions filling the first receiving grooves. The protective layer further includes a second adhesive layer, which is provided between the first protective layer and the cover layer and adheres the first protective layer and the cover layer. In the pattern area, a plurality of second receiving grooves are provided on a surface of the first protective layer facing the first adhesive layer and / or a surface of the first protective layer facing the second adhesive layer. Correspondingly, the first adhesive layer and / or the second adhesive layer extend into the second receiving grooves to form second adhesive portions filling the second receiving grooves. The protective layer further includes a first hardening layer, which is provided on a side of the second protective layer facing away from the first protective layer. A plurality of hemispherical protrusions are protruding from the surface of the first hardened layer on the side away from the second protective layer, and the plurality of hemispherical protrusions are arranged in an array; the protective layer also includes a second hardened layer and a third hardened layer, the second hardened layer is arranged on the side of the first hardened layer away from the second protective layer, and the third hardened layer is arranged on the side of the second hardened layer away from the first hardened layer, and the refractive index of the third hardened layer is smaller than the refractive index of the second hardened layer.

2. The cover plate assembly according to claim 1, wherein: In the thickness direction of the cover plate assembly, the thickness of the second protective layer is set to T1, the depth of the first receiving groove is set to T2, and T2 is less than 1 / 2T1.

3. The cover plate assembly according to claim 1, wherein: In the thickness direction of the cover plate assembly, the second accommodating groove and the first accommodating groove are staggered.

4. The cover plate assembly according to claim 1, wherein: In a thickness direction of the cover plate assembly, a depth of the second accommodating groove is smaller than a depth of the first accommodating groove.

5. The cover plate assembly according to claim 1, wherein: The sizes of the plurality of hemispherical protrusions are all the same; and / or, The surface roughness of the hemispherical protrusion is set to be less than 0.025 μm.

6. The cover plate assembly according to claim 1, wherein: The cover layer includes a cover and an encapsulation layer, wherein the encapsulation layer is located on a side of the cover facing the flexible display panel, and a groove is provided on a side of the cover facing the encapsulation layer at a position corresponding to the bending area, wherein a portion of the encapsulation layer extends into the groove and forms a filling portion that fills the groove; Wherein, the orthographic projection of the groove on the protective layer is located within the range of the pattern area.

7. A foldable display module, characterized in that: include: Flexible display panels; The cover assembly according to any one of claims 1 to 6, wherein the cover assembly is arranged on a display side of the flexible display panel; and The third adhesive layer is disposed between the flexible display panel and the cover assembly, and adheres the flexible display panel and the cover assembly.

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