Display module

Abstract

The utility model relates to a display module. The display module comprises a display panel, a first functional layer and a second functional layer, and the bending axis of the display panel is parallel to the first direction; the first functional layer is arranged on one side of the display surface of the display panel; the second functional layer is arranged on one side, deviating from the first functional layer, of the display panel; the elastic modulus of the first functional layer in the second direction is greater than that of the first functional layer in the first direction; and / or the elastic modulus of the second functional layer in the second direction is smaller than that of the second functional layer in the first direction. Through the arrangement, the neutral layer of the display module can be shifted towards the display panel in the direction pointing to the first functional layer, so that the tensile stress borne by the display panel is reduced, and the risk of breakage of a film layer in the display panel is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the display technical field, and in particular to a display module. BACKGROUND

[0002] In the process of daily use, the folding display product such as folding mobile phone may occasionally fall from a high place. In the folding display product, the hinge device for realizing the bending function has a certain gap relative to other structures. In the falling process, the hinge device is deformed by external force impact and extrudes the display panel. The display panel is locally folded out at the extrusion position. The partial film layer at the folded-out position is subjected to excessive tensile stress and cracks. Water vapor and the like easily invade along the cracks and cause display failure, such as black spots or bright lines.

[0003] Therefore, it is urgent to solve the above technical problems. CONTENT OF THE UTILITY MODEL

[0004] The embodiment of the present application provides a display module to improve the technical problem that the film layer of the display panel is cracked in the falling process of the display module and causes display failure.

[0005] In order to achieve the above-mentioned purpose, the present application provides a display module, comprising:

[0006] a display panel;

[0007] a first functional layer arranged on one side of the display panel facing the display surface;

[0008] a second functional layer arranged on the side of the display panel away from the first functional layer;

[0009] wherein the display module has a bending axis parallel to a first direction, the elastic modulus of the first functional layer in a second direction is greater than the elastic modulus of the first functional layer in the first direction; and / or the elastic modulus of the second functional layer in the second direction is less than the elastic modulus of the second functional layer in the first direction, the second direction is perpendicular to the first direction, and the first direction and the second direction are both parallel to the display surface of the display panel.

[0010] Optionally, the first functional layer comprises a protective layer, the protective layer comprises a hardening layer and a first film layer arranged in layers, the hardening layer is arranged on the side of the first film layer away from the display panel, the first film layer has a machine direction of stretch, and the machine direction of stretch of the first film layer is the same as the first direction.

[0011] Optionally, the first functional layer further comprises a polaroid, and the polaroid is arranged between the protective layer and the display panel.

[0012] Optionally, an included angle between the direction of the absorption axis of the polarizer and the first direction is 135 degrees.

[0013] Optionally, the first functional layer further includes a second film layer, the second film layer is arranged between the protective layer and the display panel, and the second film layer has a machine direction, the machine direction of the second film layer is the same as the first direction.

[0014] Optionally, the second functional layer has a machine direction, and the machine direction of the second functional layer is perpendicular to the first direction.

[0015] Optionally, the display module further includes a cover plate, the cover plate is arranged on the side of the protective layer close to the display panel, and the hardness of the cover plate is greater than the hardness of the protective layer.

[0016] Optionally, the display module includes a support layer, the support layer is arranged on the side of the second functional layer away from the display panel, and the hardness of the support layer is greater than the hardness of the second functional layer.

[0017] Optionally, the neutral layer of the display module is located in the display panel, the distance between the neutral layer of the display module and the surface of the display panel close to the side of the first functional layer is a first distance, the distance between the neutral layer of the display module and the surface of the display panel close to the side of the second functional layer is a second distance, and the first distance is less than the second distance.

[0018] Optionally, the display module has a folded state, in the folded state, the bending radius of the first functional layer is less than the bending radius of the second functional layer.

[0019] In the display module of the embodiment of the application, the elastic modulus of the first functional layer on the display side of the display panel in the second direction is set to be greater than the elastic modulus of the first functional layer in the second direction, and / or the elastic modulus of the second functional layer in the second direction is set to be less than the elastic modulus of the second functional layer in the first direction, so that the neutral layer of the display module is offset towards the direction of the first functional layer of the display panel, thereby reducing the tensile stress on the display panel and reducing the risk of film layer fracture in the display panel.

[0020] Other features and advantages of the application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0022] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0023] Figure 1 is a top view structural schematic diagram of a display module provided in an exemplary embodiment of the present disclosure;

[0024] Figure 2 is Figure 1 a sectional view at C-C in

[0025] Figure 3 is Figure 2 a partial enlarged structural schematic diagram of a display panel in

[0026] Figure 4A is a partial structural schematic diagram of a display module in a folded state provided in an exemplary embodiment of the present disclosure;

[0027] Figure 4B is a form of a display module in a folded state and in an abnormal use condition such as falling provided in an exemplary embodiment of the present disclosure;

[0028] Figure 5 is Figure 1 a structural schematic diagram of a first film layer in

[0029] Figure 6 is Figure 1 a structural schematic diagram of a polarizing sheet in

[0030] Figure 7 is Figure 1 a structural schematic diagram of a second film layer in

[0031] Figure 8 is Figure 1 a structural schematic diagram of a second functional layer in

[0032] Figure 9 is a 2PB test schematic diagram of a display module provided in an exemplary embodiment of the present disclosure.

[0033] Explanation of reference numerals:

[0034] Display module 1, light exit surface 100a;

[0035] Display panel 10, display area AA, non-display area NA, bending shaft 10a, substrate layer 11, display layer 12, encapsulation layer 13, touch layer 14;

[0036] First functional layer 20, protective layer 21, hardening layer 211, first film layer 212, polarizer 22, second film layer 23;

[0037] Second functional layer 30;

[0038] Cover plate 41, support layer 42, adhesive layer 43, buffer layer 44;

[0039] Rotating shaft component 51;

[0040] Parallel plate 60;

[0041] Neutral layer 10b, first spacing s1, second spacing s2;

[0042] First direction D1, second direction D2, machine stretching direction MD, transverse direction TD, and the direction of the absorption axis of polarizer 22 D3. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0044] To achieve the above objectives, such as Figures 1 to 3 As shown, this application provides a display module 1, including a display panel 10, a first functional layer 20, and a second functional layer 30. The bending axis 10a of the display panel 10 is parallel to the first direction D1. The first functional layer 20 is disposed on one side of the display surface of the display panel 10. The second functional layer 30 is disposed on the side of the display panel 10 away from the first functional layer 20. The elastic modulus of the first functional layer 20 in the second direction D2 is greater than the elastic modulus of the first functional layer 20 in the first direction D1. And / or, the elastic modulus of the second functional layer 30 in the second direction D2 is less than the elastic modulus of the second functional layer 30 in the first direction D1.

[0045] Display module 1 is a foldable display product. The folding method of display module 1 can be inward folding or outward folding. Inward folding means that the display face is folded inward, and outward folding means that the display face is folded outward.

[0046] The display panel 10 is a flexible panel, which can be bent around a bending axis 10a of the display panel 10. The bending axis 10a refers to a center line of symmetry when the display panel 10 is bent, and the bending axis 10a does not actually exist. The bending axis 10a can extend along a transverse direction or a longitudinal direction of the display panel 10, Figure 1 In some embodiments, the bending axis 10a extends along the transverse direction of the display panel 10. In this case, the display panel 10 can be folded along the bending axis 10a in a vertical direction. Figure 1 In some embodiments, the bending axis 10a extends along the longitudinal direction of the display panel 10. In this case, the display panel 10 can be folded along the bending axis 10a in a horizontal direction.

[0047] In some embodiments, the bending axis 10a extends along the longitudinal direction of the display panel 10. In this case, the display panel 10 can be folded along the bending axis 10a in a horizontal direction.

[0048] In some embodiments, the display panel 10 can be an OLED panel, a Mini-LED panel, a Micro-LED panel, or the like.

[0049] As shown in FIG. 1, Figure 1 The display panel 10 includes a display area AA and a non-display area NA disposed around the display area AA. The display area AA can be provided with a plurality of sub-pixels, which can include red sub-pixels, green sub-pixels, and blue sub-pixels to realize color display. The non-display area NA can be provided with a driving circuit, such as a gate driving circuit, to provide driving signals for the sub-pixels.

[0050] As shown in FIG. 1, Figure 3 In some embodiments, the display panel 10 includes a substrate layer 11, a display layer 12, an encapsulation layer 13, and a touch layer 14 stacked in sequence.

[0051] In some embodiments, the substrate layer 11 is made of a flexible material, such as one of polyimide (PI), polycarbonate (PC), poly norbornene (PNB), and polyethylene terephthalate (PET).

[0052] The display layer 12 is configured to realize a display function. The display layer 12 can include a stacked array layer and a light-emitting layer, and the light-emitting layer is disposed on a side of the array layer away from the substrate layer 11. The array layer is provided with a driving circuit, which includes a thin film transistor and the like, and the driving circuit is configured to drive the light-emitting layer to emit light. The light-emitting layer is provided with a plurality of light-emitting units, and one light-emitting unit corresponds to one sub-pixel of the display panel 10. The light-emitting unit can be an OLED, a Mini-LED, a Micro-LED, or the like.

[0053] When the light-emitting unit is an OLED, it includes an anode, a light-emitting material layer, and a cathode stacked sequentially. The light-emitting material layer may include a hole transport layer (HTL), a light-emitting layer (EML), and an electron transport layer (ETL) stacked sequentially, with the hole transport layer located on the anode side closer to the cathode. The anode provides holes, the hole transport layer transports holes to the light-emitting layer, the cathode provides electrons, and the electron transport layer transports electrons to the light-emitting layer. Holes and electrons recombine in the light-emitting layer to emit light.

[0054] In some embodiments, the encapsulation layer 13 may be a thin-film encapsulation. The encapsulation layer 13 may be formed by alternating layers of one or more organic layers and one or more inorganic layers. For example, the organic layers may be a single layer or multiple layers formed of any one of polyethylene terephthalate, polyimide, polycarbonate, epoxy resin, polyethylene, and polyacrylate. The inorganic layers may be a single layer or multiple layers of metal oxides or metal nitrides, such as silicon nitride, aluminum oxide, silicon oxide, etc.

[0055] The touch layer 14 is used to implement touch functionality. The touch layer 14 includes multiple touch electrodes (not shown) and touch traces, which are separated from the touch electrodes by an inorganic insulating layer. The inorganic insulating layer can be made of silicon oxide, silicon nitride, silicon oxynitride, etc.

[0056] like Figure 1 and Figure 2 As shown, the first functional layer 20 is disposed on the display surface side of the display panel 10. The display surface is used to display images, meaning the light emission direction of the display module 1 is the direction from the display panel 10 to the first functional layer 20. The second functional layer 30 is disposed on the non-display surface side of the display panel 10. Both the first functional layer 20 and the second functional layer 30 are made of foldable materials. When the display module 1 is folded, the first functional layer 20, the display panel 10, and the second functional layer 30 are all in a bent state. The first functional layer 20, the second functional layer 30, and the display panel 10 are bonded together by an adhesive material such as adhesive layer 43.

[0057] like Figure 2 As shown, the display module 1 includes multiple layers of film stacked together, with adjacent layers bonded together by an adhesive material such as adhesive layer 43. Adhesive layer 43 can be optical adhesive, pressure-sensitive adhesive, etc., but is not limited to these. It should be noted that some layers are self-adhesive layers, and the adhesive layer 43 with its own adhesive layer is not... Figure 2 As shown in the image.

[0058] like Figure 4AAs shown, when display module 1 is folded, the multiple film layers in display module 1 bend together. Since display module 1 has a certain thickness, each film layer in display module 1 has a different bending radius during bending; some film layers are in a stretched state, while others are in a compressed state. From a mechanical perspective, display module 1 has a neutral layer 10b during the folding process. The tensile stress and compressive stress on neutral layer 10b are equal; the film layer on one side of neutral layer 10b is subjected to tensile stress, and the film layer on the other side of neutral layer 10b is subjected to compressive stress.

[0059] When the folding method of the display module 1 is different, the position of the film layer subjected to tensile stress is different. For ease of description, the outermost surface of the display module 1 located in the light-emitting direction is referred to as the light-emitting surface 100a. When the first functional layer 20 is located at the outermost side of the display module 1, the light-emitting surface 100a is the surface of the first functional layer 20 facing away from the display panel 10; when the side of the first functional layer 20 facing away from the display panel 10 also includes other film layers, the light-emitting surface 100a is the surface of the film layer furthest from the display panel 10 among the other film layers.

[0060] When the display module 1 is folded inward, the film layer on the side of the display module 1 closest to the light-emitting surface 100a is subjected to compressive stress, and the film layer on the side of the display module 1 furthest from the light-emitting surface 100a is subjected to tensile stress. When the display module 1 is folded outward, the film layer on the side of the display module 1 closest to the light-emitting surface 100a is subjected to tensile stress, and the film layer on the side of the display module 1 furthest from the light-emitting surface 100a is subjected to compressive stress.

[0061] Specifically, such as Figure 4A As shown, taking the display module 1 which is folded inward in its normal state as an example, in the normal form of the folded state, the film layer on the side of the display module 1 closest to the light-emitting surface 100a is compressed and subjected to compressive stress inside the film layer, while the film layer on the side of the display module 1 furthest from the light-emitting surface 100a is stretched and subjected to tensile stress inside the film layer.

[0062] like Figure 4BAs shown, in the folded state and in an abnormal use condition such as falling from a high place, part of the film layers in the display module 1 are impacted by external force. For example, the display module 1 is impacted by an external structure such as the rotating shaft device 51, and the display module 1 in the interference area with the rotating shaft device 51 changes from originally inward folding to outward folding. At this time, the film layers on the side close to the light exit surface 100a in the outward folded display module 1 are subjected to tensile stress, and part of the film layers are subjected to excessive tensile stress and cracks are generated. Different materials can withstand different maximum tensile stresses. In general, the elastic modulus of organic materials is greater than that of inorganic materials. Inorganic materials in the display panel 10 are more prone to cracking than organic materials. Inorganic materials such as inorganic layers in the encapsulation layer 13 and / or inorganic insulating materials in the touch layer 14 are prone to cracking, and water vapor and the like are easy to invade along the cracks to cause display panel 10 to have display defects such as black spots or bright lines when displaying.

[0063] In embodiments of the present application, the first functional layer 20 and the second functional layer 30 are both anisotropic film layers, which means that the film layers have different elastic moduli in different directions. The elastic modulus refers to the stress divided by the strain in the direction under unidirectional stress state. The greater the elastic modulus, the greater the stress that the film layers in the display module 1 can withstand under the same strain degree, and the less prone to breaking.

[0064] In some embodiments, the elastic modulus of the first functional layer 20 in the second direction D2 is greater than the elastic modulus of the first functional layer 20 in the first direction D1, and the elastic modulus of the second functional layer 30 in the second direction D2 is less than the elastic modulus of the second functional layer 30 in the first direction D1.

[0065] In some embodiments, the elastic modulus of the first functional layer 20 in the second direction D2 is greater than the elastic modulus of the first functional layer 20 in the first direction D1, or the elastic modulus of the second functional layer 30 in the second direction D2 is less than the elastic modulus of the second functional layer 30 in the first direction D1.

[0066] By setting the elastic modulus of the first functional layer 20 in the second direction D2 to be greater than the elastic modulus of the first functional layer 20 in the first direction D1, it is equivalent to increasing the elastic modulus of the first functional layer 20 in the second direction D2, that is, in the case of a constant strain, the tensile stress in the plane where the original neutral layer 10b of the display module 1 is located increases, and the compressive stress decreases, so the plane where the tensile stress is equal to the compressive stress is shifted to the side of the first functional layer 20 close to the light-out surface 100a, that is, the neutral layer 10b is shifted to the side of the light-out surface 100a. Similarly, by setting the elastic modulus of the second functional layer 30 in the second direction D2 to be less than the elastic modulus of the second functional layer 30 in the first direction D1, it is equivalent to reducing the elastic modulus of the second functional layer 30 in the second direction D2, that is, in the case of a constant strain, the tensile stress in the plane where the original neutral layer 10b of the display module 1 is located increases, and the compressive stress decreases, so the plane where the tensile stress is equal to the compressive stress is shifted to the side of the first functional layer 20 close to the light-out surface 100a, that is, the neutral layer 10b is shifted to the side of the light-out surface 100a. By the above setting, the neutral layer 10b of the display module 1 is shifted in the direction of the light-out surface 100a, reducing the tensile stress of the display panel 10 in the abnormal use condition such as falling, thereby reducing the risk of film layer breakage in the display panel 10.

[0067] It should be understood that when the neutral layer 10b of the display module 1 is adjusted only by adjusting the first functional layer 20 or only by adjusting the second functional layer 30, the shift amount of the neutral layer 10b is small, and the distance of the neutral layer 10b to the light-out surface 100a is large; when the neutral layer 10b of the display module 1 is adjusted by adjusting the first functional layer 20 and the second functional layer 30 at the same time, the shift amount of the neutral layer 10b is large, and the distance of the neutral layer 10b to the light-out surface 100a is small. When the shift amount of the neutral layer 10b is larger, that is, the neutral layer 10b is closer to the light-out surface 100a, the tensile stress of the film layer in the display panel 10 is smaller when falling, and the risk of breakage is smaller.

[0068] Optionally, as shown in Figure 2 and Figure 5 The first functional layer 20 includes a protective layer 21, and the protective layer 21 includes a hardening layer 211 and a first film layer 212 stacked, the hardening layer 211 is arranged on the side of the first film layer 212 away from the display panel 10, and the first film layer 212 has a machine direction MD, and the machine direction MD of the first film layer 212 is the same as the first direction D1.

[0069] The protective layer 21 is mainly used to protect other film layers and prevent damage to the fragile and expensive film layer (such as the cover plate 41) under the external force.

[0070] In some embodiments, the hardening layer 211 is used to improve the surface hardness of the display module 1. The hardening layer 211 can be a hard coating (HC) layer.

[0071] In some embodiments, the first film layer 212 can be an anisotropic material, such as one of colorless polyimide (PI), polycarbonate (PC), poly (norbornene) (PNB), and poly (ethylene terephthalate) (PET).

[0072] The first film layer 212 has a machine direction MD (Machine direction, MD), which refers to the running direction of the machine during production. The transverse direction TD (Transverse direction, TD) is perpendicular to the machine direction MD. Due to the production process, the elastic modulus of the first film layer 212 in the machine direction MD is greater than that in the transverse direction TD. Therefore, the machine direction MD of the first film layer 212 can be set the same as the first direction D1, so that the neutral layer 10b of the display module 1 is offset to the light-emitting surface 100a without affecting the folding reliability of the display module 1.

[0073] Optionally, as shown in FIG. 2B, the first functional layer 20 further includes a polarizer 22, which is arranged between the protective layer 21 and the display panel 10. The polarizer 22 is used to reduce the reflection of ambient light by the display panel 10 and improve the glare problem of the display module 1. Figure 2

[0074] In some embodiments, the polarizer 22 is in direct contact with the display panel 10, that is, the polarizer 22 is attached to the side surface of the display panel 10 away from the second functional layer 30. The polarizer 22 has a self-adhesive film layer, and the polarizer 22 includes a substrate and an adhesive layer 43. The thickness of the substrate and the adhesive layer 43 can be set as needed. For example, the thickness of the substrate can be 32 microns, and the thickness of the adhesive layer 43 can be 15 microns, but is not limited thereto.

[0075] In some embodiments, the substrate of the polarizer 22 includes a PVA (polyvinyl alcohol) layer, which is usually made by a stretching process, which will cause the difference in the elastic modulus of the polarizer 22 in different directions. The stretching direction of the PVA layer is the direction of the absorption axis.

[0076] Optionally, as shown in FIG. 2B, the first functional layer 20 further includes a polarizer 22, which is arranged between the protective layer 21 and the display panel 10. The polarizer 22 is used to reduce the reflection of ambient light by the display panel 10 and improve the glare problem of the display module 1. Figure 2 and Figure 6 ​As shown in FIG. 1, the angle a between the direction D3 of the absorption axis of the polarizer 22 and the first direction D1 is 135 degrees. Among them, the elastic modulus of the polarizer 22 is the largest in the direction at 45 degrees to the direction D3 of the absorption axis of the polarizer 22. By setting the angle a between the direction D3 of the absorption axis of the polarizer 22 and the first direction D1 to 135 degrees, the elastic modulus of the polarizer 22 in the second direction D2 can be maximized, so that the neutral layer 10b of the display module 1 is further offset to the side of the light-emitting surface 100a, and the tensile stress of the display panel 10 during the falling process is further reduced.

[0077] Optionally, as shown in FIG. 1, Figure 2 and Figure 7 As shown in FIG. 1, the first functional layer 20 further includes a second film layer 23, the second film layer 23 is arranged between the protective layer 21 and the display panel 10, and the second film layer 23 has a machine direction MD, and the machine direction MD of the second film layer 23 is the same as the first direction D1.

[0078] The second film layer 23 can replace the polarizer 22, and the second film layer 23 is arranged on the display panel 10 to form a polarizer-free (Pol less) structure. The second film layer 23 is in direct contact with the display panel 10, that is, the second film layer 23 is attached to the side surface of the display panel 10 away from the second functional layer 30. By replacing the polarizer 22 with the second film layer 23, the cost of the display module 1 can be reduced. In order to simplify the attachment process, the second film layer 23 can be a self-adhesive film layer, that is, the second film layer 23 can include a substrate and an adhesive layer 43. The thickness of the substrate and the adhesive layer 43 can be set as needed. For example, the thickness of the substrate can be 23 microns, and the thickness of the adhesive layer 43 can be 50 microns, but is not limited thereto.

[0079] In some embodiments, the second film layer 23 can be an anisotropic material, such as one of colorless polyimide (PI), polycarbonate (PC), poly (norbornene) (PNB), and poly (ethylene terephthalate) (PET).

[0080] The second film layer 23 has a machine direction MD. Due to the production process, the elastic modulus of the second film layer 23 in the machine direction MD is greater than the elastic modulus of the second film layer 23 in the transverse direction, so the machine direction MD of the second film layer 23 can be set to be the same as the first direction D1, thereby offsetting the neutral layer 10b of the display module 1 to the side of the light-emitting surface 100a without affecting the folding reliability of the display module 1.

[0081] Optionally, as shown in FIG. 1, Figure 2 and Figure 8 As shown in FIG. 1, the second functional layer 30 has a machine direction MD, and the machine direction MD of the second functional layer 30 is perpendicular to the first direction D1.

[0082] In some embodiments, the second functional layer 30 may be an anisotropic material, such as colorless polyimide (PI), polycarbonate (PC), polynorbornene (PNB), and polyethylene terephthalate (PET).

[0083] like Figure 2 As shown, the second functional layer 30 can directly contact the display panel 10, that is, the second functional layer 30 is attached to the surface of the display panel 10 facing away from the first functional layer 20. The second functional layer 30 can be used as a back plate of the display panel 10, which can prevent the display panel 10 from being damaged by external forces and can block water and oxygen.

[0084] Optionally, such as Figure 2 As shown, the display module 1 also includes a cover plate 41, which is disposed on the side of the protective layer 21 near the display panel 10. The hardness of the cover plate 41 is greater than that of the protective layer 21.

[0085] The cover plate 41 is mainly used to improve the surface strength of the display panel 10 and enhance its impact resistance. The cover plate 41 can be bent together with the display panel 10 and other flexible film layers, thereby giving the display module 1 good bending performance.

[0086] In some embodiments, the cover plate 41 is made of flexible materials such as polyimide, ultra-foldable glass (UFG), or ultra-thin glass (UTG). When the protective layer 21 is attached to glass materials such as UFG or UTG, it can prevent consumers from being stabbed or cut by shards of glass after it shatters.

[0087] Optionally, such as Figure 2 As shown, the display module 1 includes a support layer 42, which is disposed on the side of the second functional layer 30 away from the display panel 10. The hardness of the support layer 42 is greater than that of the second functional layer 30.

[0088] The support layer 42 has a certain rigidity, which can provide back support and protection for the display panel 10, making the back of the display panel 10 less susceptible to impact damage.

[0089] In some embodiments, the support layer 42 may be made of materials such as stainless steel or copper. The hardness of the support layer 42 is greater than that of the second functional layer 30, thereby improving the mechanical strength of the display module 1 and preventing the display module 1 from being damaged by impact.

[0090] In some embodiments, such as Figure 2As shown, the display module 1 further comprises a buffer layer 44 arranged between the second functional layer 30 and the support layer 42. The material of the buffer layer 44 is a material having a buffering performance. The material of the buffer layer 44 can be one of foam, rubber, silica gel and plastic. The buffer layer 44 can realize shock absorption and prevent external stress from damaging the display panel 10.

[0091] In some embodiments, the buffer layer 44 can be a stack of black polyimide, foam and pressure-sensitive adhesive.

[0092] Optionally, as shown, Figure 3 As shown, the neutral layer 10b of the display module 1 is located in the display panel 10, the distance between the neutral layer 10b of the display module 1 and the surface of the display panel 10 close to the first functional layer 20 is a first distance s1, and the distance between the neutral layer 10b of the display module 1 and the surface of the display panel 10 close to the second functional layer 30 is a second distance s2, the first distance s1 is smaller than the second distance s2.

[0093] In some embodiments, the neutral layer 10b of the display module 1 is located in the display panel 10. Since the cost of the display panel 10 is higher than that of the first functional layer 20 and the second functional layer 30, in order to avoid damage to the display panel 10 during folding, the neutral layer 10b of the display module 1 is arranged in the display panel 10, so that the stress of the display panel 10 relative to the first functional layer 20 and the second functional layer 30 is smaller, and the display panel 10 is less likely to be damaged due to tensile stress or compressive stress during folding. At the same time, the first distance s1 is smaller than the second distance s2, that is, the neutral layer 10b of the display module 1 is adjusted to be closer to the light exit surface 100a, which can reduce the tensile stress of the film layer close to the light exit surface 100a of the display panel 10 when the display module 1 is folded outward, thereby avoiding damage to the film layer of the display panel 10 due to excessive tensile stress, and improving the anti-outward folding capability of the display panel 10 during falling and dropping.

[0094] Optionally, as shown, Figure 4A As shown, the display module 1 has a folded state, and in the folded state, the bending radius of the first functional layer 20 is smaller than the bending radius of the second functional layer 30. That is, the display module 1 is inward folded in the folded state. In the folded state, the first functional layer 20 is bent into an arc shape, and the radius of the arc shape is the bending radius. Since the display module 1 has a certain thickness, the film layer close to the upper surface of the display module 1 and the film layer close to the lower surface of the display module 1 have different bending radii. Among them, the upper surface and the lower surface of the display module 1 refer to two surfaces of the display module 1 along the thickness direction, wherein the upper surface is the light exit surface 100a, and the lower surface is a surface opposite to the light exit surface 100a. The first functional layer 20 is close to the upper surface, and the bending radius of the first functional layer 20 is smaller; the second functional layer 30 is close to the lower surface, and the bending radius of the second functional layer 30 is larger.

[0095] AsFigure 9 As shown, the current industry mainly uses 2PB (Point Bending) test as the evaluation standard to show the anti-bending ability of the display module 1. The display module 1 is placed between two parallel plates 60 in the inner bending (actual use state, the light emitting surface 100a is on the inner side) or outer bending (abnormal state, the light emitting surface 100a is on the outer side). As shown, Figure 9 As shown, the case of outer bending is shown. The plate spacing D of the parallel plate 60 is continuously reduced until the display fails, and the plate spacing D is recorded as the data for evaluating the anti-bending / outer bending ability of the display module 1. Generally, the inner bending ability D of the display module 1 ranges from 0.5 mm to 1.0 mm, and the outer bending ability D ranges from 3.0 mm to 5.0 mm. Obviously, reducing the size of the 2PB outer bending ability D of the display module 1 is crucial to its anti-falling risk.

[0096] The display module 1 provided by the embodiments of the present application has a measured outer bending 2PB plate spacing D that is at least 0.5 mm smaller than that in the related art in the 2PB test. Through simulation, the display module 1 provided by the embodiments of the present application reduces the tensile stress on the display side of the display panel 10 by 1.7% when the bending radius R is 2 mm.

[0097] In the present embodiment, the display module 1 can be: a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, or any product or component with display function.

[0098] In the description of the present application, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0099] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0100] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0101] The above is only the preferred embodiments of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solution of the present application, still falls within the scope of the technical solution of the present application.

Claims

1. A display module, characterized by The display module comprises: a display panel; a first functional layer arranged on a display surface side of the display panel; a second functional layer arranged on a side of the display panel away from the first functional layer; wherein the display module has a bending axis parallel to a first direction, the elastic modulus of the first functional layer in a second direction is greater than the elastic modulus of the first functional layer in the first direction; and / or the elastic modulus of the second functional layer in the second direction is less than the elastic modulus of the second functional layer in the first direction, the second direction is perpendicular to the first direction, and the first direction and the second direction are both parallel to the display surface of the display panel.

2. The display module of claim 1, wherein, The first functional layer comprises a protective layer, the protective layer comprises a hardening layer and a first film layer arranged in layers, the hardening layer is arranged on a side of the first film layer away from the display panel, and the first film layer has a machine direction of stretch, the machine direction of stretch of the first film layer is the same as the first direction.

3. The display module of claim 2, wherein, The first functional layer further comprises a polarizer, and the polarizer is arranged between the protective layer and the display panel.

4. The display module of claim 3, wherein, The angle between the absorption axis of the polarizer and the first direction is 135 degrees.

5. The display module of claim 2, wherein, The first functional layer further comprises a second film layer, the second film layer is arranged between the protective layer and the display panel, the second film layer has a machine direction of stretch, and the machine direction of stretch of the second film layer is the same as the first direction.

6. The display module of claim 1, wherein, The second functional layer has a machine direction of stretch, and the machine direction of stretch of the second functional layer is perpendicular to the first direction.

7. The display module of any one of claims 2 to 5, wherein, The display module further comprises a cover plate, the cover plate is arranged on a side of the protective layer close to the display panel, and the hardness of the cover plate is greater than the hardness of the protective layer.

8. The display module of claim 7, wherein, The display module comprises a support layer, the support layer is arranged on a side of the second functional layer away from the display panel, and the hardness of the support layer is greater than the hardness of the second functional layer.

9. The display module of any one of claims 1 to 6, wherein, The neutral layer of the display module is located in the display panel, the distance between the neutral layer of the display module and the surface of the display panel close to the first functional layer is a first distance, the distance between the neutral layer of the display module and the surface of the display panel close to the second functional layer is a second distance, and the first distance is less than the second distance.

10. The display module of any one of claims 1 to 6, wherein, The display module has a folded state, in the folded state, the bending radius of the first functional layer is less than the bending radius of the second functional layer.

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