Display module, foldable display screen and display device

Abstract

The invention provides a display module, a foldable display screen and a display device, the display module comprises a foldable display layer, the foldable display layer comprises a bending area and a flat area adjacent to the bending area; the first supporting structure is located on the non-display side of the foldable display layer, the first supporting structure is used for supporting the bending area, and the first supporting structure meets at least one of the following conditions: the elastic modulus is larger than or equal to 60 GPa, the hardness is larger than 270 HV, the tensile strength is larger than or equal to 700 MPa, and the yield strength is larger than or equal to 600 MPa; the second supporting structure is located on the side, away from the foldable display layer, of the first supporting structure. According to the display module, the first supporting structure with high modulus and high strength is added to serve as a supporting piece of the foldable display layer, the enough supporting capacity can be achieved when the bending area is extruded or pressed by external force, and the anti-extrusion capacity of the display module is improved; therefore, the GDS (black group) phenomenon occurring when the bending area of the foldable display layer is pressed is prevented.

Description

Technical Field

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

[0002] This section is intended to provide a background or context to the embodiments recited in the claims. No admission is made that the description herein is prior art by inclusion in this section.

[0003] Flexible displays are thin and foldable, such as organic electroluminescent displays (OLEDs), which are widely used in the field of foldable displays, especially in the field of mobile phones. However, compared with traditional LCD screen mobile phones, the screen strength, flatness and life of flexible foldable mobile phones in the bending zone are greatly reduced. The screen and mechanism in the bending zone 110 are generally not fixed. The bending zone of the foldable display product cannot be effectively supported from the bottom during the folding and stopping of the whole machine, resulting in insufficient anti-extrusion ability of the bending zone. GDS (black mass) is prone to appear when the bending zone is pressed. In addition, the support member at the bottom is prone to deformation and glue sinking in the bending zone during multiple folding processes, resulting in mold imprints and obvious creases. Summary of the invention

[0004] The following is a summary of the subject matter of the detailed description of the present disclosure. This summary is not intended to limit the scope of the claims.

[0005] The present disclosure provides a display module, a foldable display screen and a display device.

[0006] A first aspect of the present disclosure provides a display module, the display module comprising:

[0007] A foldable display layer, the foldable display layer comprising a bending area and a flat area disposed adjacent to the bending area;

[0008] A first supporting structure, located on the non-display side of the foldable display layer, the first supporting structure is used to support the bending area; the first supporting structure meets at least one of the following conditions: elastic modulus ≥ 60GPa, hardness > 270HV, tensile strength ≥ 700MPa, yield strength ≥ 600Mpa;

[0009] The second supporting structure is located at a side of the first supporting structure away from the foldable display layer.

[0010] In some exemplary embodiments, the first support structure satisfies the following conditions simultaneously: elastic modulus>100 GPa, hardness>270 HV, tensile strength≥700 MPa, and yield strength≥600 MPa.

[0011] In some exemplary embodiments, the material of the first support structure includes at least one of the following materials: stainless steel, titanium alloy, and copper alloy.

[0012] In some exemplary embodiments, the second supporting structure is provided with a first elastic buffer, the first elastic buffer is located in the bending zone and the flat zone, and the first elastic buffer is used to release the pressure at the bending zone when the foldable display layer is in a bent state.

[0013] In some exemplary embodiments, the first supporting structure is connected to the foldable display layer via a first adhesive layer, and the first supporting structure is provided with a second elastic buffer zone, the second elastic buffer zone is offset from the first elastic buffer zone, and the second elastic buffer zone is used to release the pressure of the first supporting structure in the bending zone.

[0014] In some exemplary embodiments, the first supporting structure is connected to the second supporting structure via a second adhesive layer, wherein the second adhesive layer located in the bending area is provided with a third elastic buffer zone.

[0015] In some exemplary embodiments, the second adhesive layer includes a first opening, wherein the first opening is located in the third elastic buffer zone, and the first opening penetrates the second adhesive layer in a direction perpendicular to the foldable display layer.

[0016] In some exemplary embodiments, the first opening is filled with a third adhesive layer, and an elastic modulus of the third adhesive layer is higher than an elastic modulus of the second adhesive layer in the flat area.

[0017] In some exemplary embodiments, at least one of the first elastic buffer zone, the second elastic buffer zone, and the third elastic buffer zone comprises a mesh structure.

[0018] In some exemplary embodiments, the mesh structures of the first elastic buffer, the second elastic buffer, and the third elastic buffer are the same; or

[0019] At least two of the first elastic buffer zone, the second elastic buffer zone, and the third elastic buffer zone have different mesh structures.

[0020] In some exemplary embodiments, the second supporting structure includes at least a first supporting layer, the material of the first supporting layer includes at least one of the following: carbon fiber composite material, stainless steel, titanium alloy, and the first elastic buffer zone is provided on the first supporting layer.

[0021] In some exemplary embodiments, the second supporting structure further comprises a fourth adhesive layer and a second supporting layer sequentially located below the first supporting layer, wherein a fourth elastic buffer zone is disposed on the fourth adhesive layer and the second supporting layer located in the bending zone.

[0022] In some exemplary embodiments, the fourth adhesive layer includes a second opening, the second opening is located in the fourth elastic buffer layer, and the second opening penetrates the fourth adhesive layer and the second supporting layer in a direction perpendicular to the foldable display layer.

[0023] In some exemplary embodiments, the second opening is filled with a fifth adhesive layer, and an elastic modulus of the fifth adhesive layer is higher than an elastic modulus of the fourth adhesive layer located in the flat area.

[0024] In some exemplary embodiments, the first support structure has a thickness in the range of 20-30 μm.

[0025] A second aspect of the present disclosure provides a display device, comprising: the display module as described in the first aspect.

[0026] In the display module, foldable display screen and display device provided by the embodiments of the present disclosure, a first supporting structure with high modulus and high strength is added to the display module as a support member for the foldable display layer, which can provide sufficient supporting capacity when the bending area is squeezed or pressed by external force, thereby improving the anti-extrusion capacity of the display module, thereby preventing the GDS (black group) phenomenon that occurs in the bending area of ​​the foldable display layer when pressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings incorporated into the specification and constituting a part of the specification illustrate embodiments of the present disclosure and are used together with the description to explain the principles of the embodiments of the present disclosure. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present disclosure, rather than all embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 is a schematic structural diagram of a display module according to an exemplary embodiment;

[0029] Figure 1a is a schematic structural diagram of a display module according to another exemplary embodiment;

[0030] Figure 1b is a schematic structural diagram of a carbon fiber composite layer in a display module according to an exemplary embodiment;

[0031] Figure 2is a schematic structural diagram of a foldable display layer in a display module according to an exemplary embodiment;

[0032] Figure 3 A schematic diagram of the structure of a display module in a water drop folding form according to an exemplary embodiment;

[0033] Figure 4 A schematic structural diagram of a second supporting structure in a display module according to an exemplary embodiment;

[0034] Figure 5 for Figure 4 A magnified view of the structure of the middle D region;

[0035] Figure 6-Figure 9 A schematic structural diagram of a second elastic buffer area according to an exemplary embodiment.

[0036] Fig.10 is a schematic structural diagram of a display module according to another exemplary embodiment;

[0037] Fig.11 is a schematic structural diagram of a second adhesive layer in a display module according to an exemplary embodiment;

[0038] Fig.12 is a schematic structural diagram of a display module according to an exemplary embodiment;

[0039] Fig.12a is a schematic diagram showing an initial structure of a second supporting structure having multiple film layers in a display module according to an exemplary embodiment;

[0040] Figure 12b is a schematic diagram showing an initial structure of a second supporting structure having multiple film layers in a display module according to another exemplary embodiment;

[0041] Fig.12c is a schematic diagram showing an initial structure of a second supporting structure having multiple film layers in a display module according to another exemplary embodiment;

[0042] Fig.13 is a schematic structural diagram of a display module according to an exemplary embodiment;

[0043] Fig.14 is a schematic structural diagram of a display module according to an exemplary embodiment;

[0044] Fig.15 It is a schematic structural diagram of a display module according to an exemplary embodiment. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the embodiments of the present disclosure clearer, the technical scheme in the embodiments of the present disclosure will be clearly and completely described in combination with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure. It should be noted that, in the absence of conflict, the embodiments in the present disclosure and the features in the embodiments can be arbitrarily combined with each other. The present disclosure is further described below in combination with the embodiments shown in the drawings.

[0046] In an exemplary embodiment of the present disclosure, a display module is provided. The display module is a foldable module and can be applied to a foldable display screen. The foldable display screen can be applied to a terminal having a display device, such as a mobile phone, a tablet computer, a phone watch, a camera, etc. Figure 1 As shown, Figure 1 A schematic diagram of the structure of a display module provided according to an exemplary embodiment of the present disclosure is shown, and the display module includes:

[0047] A foldable display layer 100, the foldable display layer 100 includes a bending area A and a flat area B disposed adjacent to the bending area A;

[0048] A first supporting structure 200, located on the non-display side of the foldable display layer 100 and connected to the surface of the foldable display layer 100, and the first supporting structure 200 is used to support the bending area A;

[0049] The second support structure 300 is connected to the surface of the first support structure 200 which is away from the foldable display layer 100. Figure 1 As shown, the foldable display layer 100 is a display layer that can realize the folding function, including a flexible display layer. The flexible display layer refers to a deformable and bendable display layer made of soft materials for display. The flexible display layer has the characteristics of good flexibility and good light transmittance. Its structure and light-emitting principle are similar to those of an OLED device with a common glass substrate, thereby realizing the use of the display module as a flexible liquid crystal display (LCD) or a flexible OLED (organic light emitting diode). Reference Figure 2 As shown, the foldable display layer 100 is a multi-layer structure, which at least includes: a back film 101, a display panel 102, a first optical adhesive 103, a glass layer 104, a second optical adhesive 105, and a substrate 106 stacked in sequence from bottom to top. Exemplarily, the glass layer 104 is, for example, ultra-thin glass, and the substrate 106 is, for example, made of polyethylene terephthalate or polyimide.

[0050] like Figure 1As shown, when the display module is in the unfolded state, the bending area A can be located in the middle of the display module. The bending area A is the area where the display module bends more when in the bent state. The areas on both sides of the bending area A and adjacent to the bending area A are flat areas B. The flat areas B include areas where the display module does not bend when in the bent state and parts with a smaller curvature. The part between the bending area A and the flat areas B is the adhesive area C. The adhesive area C is the area where the display module is glued to the middle frame of the display screen to fix the display module. Figure 3 As shown, when the display module presents a water drop folding shape, the innermost layer is the foldable display layer 100 (refer to Figure 1 ), the outermost one is the second support structure 300 (reference Figure 1 ),refer to Figure 1 and Figure 3 The display module includes a water drop arc top area, an adhesive area and a water drop arc starting area in the folded state, wherein the bending area A of the display module corresponds to the position of the water drop arc top area, the adhesive area C of the display module is the adhesive area, and the flat area B of the display module can be the water drop arc starting area.

[0051] refer to Figure 1 The first support structure 200 can be connected to the back of the foldable display layer 100 through the first adhesive layer 400. The first support structure 200 is used to support the bending area A formed when the foldable display layer 100 is in a bent state, so as to provide sufficient support when the bending area A is squeezed or pressed by an external force when the foldable display layer 100 is in a bent state, so as to prevent the bending area A from causing GDS (black mass) to appear in the foldable display layer 100 due to pressure. The first support structure 200 is made of high modulus and high strength materials. High strength refers to the high mechanical performance indicators such as tensile strength and compressive strength of the material, while high modulus refers to the high stiffness of the material, that is, it is not easy to deform under the action of force.

[0052] For example, Figure 1 As shown, the first support structure 200 may satisfy at least one of the following conditions: elastic modulus ≥ 60 GPa, hardness > 270 HV, tensile strength ≥ 700 MPa, and yield strength ≥ 600 MPa. For example, the first support structure 200 satisfies two or more of the above conditions, such as the elastic modulus of the first support structure 200 is 100 GPa, the hardness is 280 HV, and the tensile strength is 700 MPa. In other exemplary embodiments, Figure 1As shown, the first support structure 200 can also meet the following conditions at the same time: elastic modulus> 100GPa, hardness> 270HV, tensile strength ≥ 700MPa, yield strength ≥ 600Mpa, so as to form a high modulus and high strength first support structure 200, so that the first support structure 200 has sufficient elasticity and sufficient tensile strength to meet the bending requirements of the display module, so that the display module can achieve a smaller folding radius, better anti-extrusion performance, and at the same time can also improve the appearance of the mold and crease. For example, the first support structure 200 can be made of at least one of the following materials: stainless steel, titanium alloy, copper alloy.

[0053] refer to Figure 1 The second support structure 300 is located at the bottom layer of the display module. The second support structure 300 is located on the surface of the first support structure 200 away from the foldable display layer 100 and is connected to the first support structure 200. The second support structure 300 can be used as a backplane support material of the display module, play a certain leveling role, and improve the stability of the entire display module. The thickness of the second support structure 300 can be greater than that of the first support structure 200, so that the thicker second support structure 300 can be used to support the entire display module.

[0054] In order to form a lightweight display module, the thickness of the first supporting structure can be controlled within a range of 20-30 μm.

[0055] In the display module provided by the embodiment of the present disclosure, a first supporting structure with high modulus and high strength is added to the display module, and the first supporting structure is used as a support member for the foldable display layer. It can provide sufficient supporting capacity when the bending area is squeezed or pressed by external force, compensate for the pressure, and improve the anti-extrusion ability of the display module, thereby preventing the GDS (black group) phenomenon that occurs in the bending area of ​​the foldable display layer when pressed.

[0056] In an exemplary embodiment, reference Figure 1 As shown, the second supporting structure 300 in this embodiment is provided with a first elastic buffer zone 310 at corresponding positions of the bending zone A and the flat zone B. The first elastic buffer zone 310 can release the pressure at the bending zone A when the foldable display layer 100 is in a bent state, so as to utilize the first elastic buffer zone 310 to improve the anti-extrusion performance of the entire display module; moreover, the first elastic buffer zone 310 can also reduce mold imprint and crease marks during the folding and stopping of the display module.

[0057] The second supporting structure may be a single-layer structure or a multi-layer structure. Figure 4As shown, a schematic diagram of the structure of the second support structure 300 is exemplarily shown. Taking the second support structure 300 as a single membrane layer structure as an example, the second support structure 300 is formed by a single-layer support layer, that is, the second support structure 300 is formed by a first support layer, and the material of the first support layer includes at least one of the following: carbon fiber composite material, stainless steel, and titanium alloy. For example, the second support structure 300 is a carbon fiber composite layer plate, or a stainless steel plate, or a titanium alloy plate. The total thickness of the second support structure 300 is, for example, in the range of 80μm to 200μm, such as 90μm, 120μm, 150μm, etc., and no specific limitation is made here.

[0058] refer to Figure 1a As shown, taking the second supporting structure as a carbon fiber composite layer plate 30 as an example, the carbon fiber composite layer plate 30 is multi-layered, and the carbon fiber composite layer plate 30 includes a first carbon fiber layer 31, a second carbon fiber layer 32 and a third carbon fiber layer 33. For example, referring to Figure 1a The above three carbon fiber layers are all single-layer structures, the thickness of the first carbon fiber layer 31 is in the range of 20 to 35 μm, the thickness of the second carbon fiber layer 32 is in the range of 110 to 130 μm, and the thickness of the third carbon fiber layer 33 is in the range of 20 to 35 μm. For example, the thickness of the first carbon fiber layer 31 and the thickness of the third carbon fiber layer 33 are both 30 μm, and the thickness of the second carbon fiber layer 32 is 120 μm. Figure 1b , illustratively, the fiber directions of the first carbon fiber layer 31 and the third carbon fiber layer 33 are 0°, and the fiber direction of the second carbon fiber layer 32 is 90°.

[0059] refer to Figure 1 The second support structure 300 is provided with a first elastic buffer 310, which is located at the corresponding position of the bending area A and the flat area B. The first elastic buffer 310 is an area with elastic properties to meet the folding performance of the display module. Figure 4 As shown, the first elastic buffer 310 is, for example, a mesh structure, that is, a structure formed by a plurality of holes staggered in the transverse and longitudinal directions. The staggered arrangement of the plurality of holes allows the area to present a spring state. Therefore, the first elastic buffer 310 has the ability to stretch and contract in the transverse and / or longitudinal directions, which is conducive to bending.

[0060] refer to Fig.10 As shown, a part of the holes may be hollow holes formed by penetrating the second support structure 300 in the thickness direction, and a part of the holes may be blind holes formed by not penetrating the second support structure 300 in the thickness direction. The shapes of the holes include round holes, rounded rectangular holes, etc., and no specific restrictions are made here.

[0061] refer to Figure 4 and Figure 5As shown, a schematic structural diagram of the first elastic buffer is exemplarily shown. The first elastic buffer 310 is a structure formed by staggered arrangement of multiple hollow mesh holes in the horizontal and / or vertical directions. The size of the mesh holes can be determined according to the size of the actual position. Taking the mesh holes as rounded rectangular holes as an example, the parameters are as follows: the length a is 3 to 8 mm, the width b is 0.08 to 0.3 mm, the distance c between adjacent rounded rectangular holes in the vertical direction is 0.1 to 0.3 mm, the distance d between adjacent rounded rectangular holes in the horizontal direction is 0.05 to 0.3 mm, and the radius r of the rounded corner is 0.05 to 0.15 mm.

[0062] For example, reference Figure 1 As shown, the first support structure 200 is connected to the surface of the foldable display layer 100 through the first adhesive layer 400, wherein the first adhesive layer is, for example, PSA adhesive, such as rubber-type PSA, thermoplastic elastomer PSA, acrylate PSA, silicone PSA and polyurethane PSA, etc. PSA is a pressure-sensitive adhesive, which is a type of adhesive that can be bonded to the adherend without the aid of solvents, heat or other means, but only by applying slight pressure. In order to prevent the first support structure 200 and the first adhesive layer 400 located in the bending area A from cracking after the display module is folded multiple times, a second elastic buffer 210 is provided on the first support structure 200, so as to use the second elastic buffer 210 to release the pressure of the first support structure 200 in the bending area A, and can also meet the demand for a smaller bending radius of the display module, for example, a bending radius of <3mm.

[0063] refer to Figure 4 and Figure 6 As shown, the second elastic buffer 210 is staggered with the first elastic buffer 310. Specifically, the first elastic buffer 310 is located at the corresponding positions of the bending area A and the flat area B, and the second elastic buffer 210 is arranged at the adhesive area C on both sides of the bending area A. The second elastic buffer 210 has elastic properties that just play a role in releasing pressure. When the display module is in a bent state, the squeezing force on both sides of the first support structure 200 in the bending area A is reduced. When the display module is in an unfolded state, it provides a stretching space for the first support structure 200 in the bending area A.

[0064] The structure of the second elastic buffer area is the same as or different from that of the first elastic buffer area. Figure 6-Figure 9 The schematic diagrams of the structure of the second elastic buffer in the first support structure are shown respectively, wherein the second elastic buffer 210 is, for example, a structure formed by staggered arrangement of multiple hollow holes in the horizontal and / or vertical directions, and the size of the holes can be determined according to the size of the actual position. Figure 6 As shown, the second elastic buffer zone 210 is a structure formed by a plurality of hollow circular holes arranged in parallel in the transverse direction. Figure 7 As shown, the second elastic buffer zone 210 is a structure formed by a plurality of hollow circular holes staggered in the horizontal and vertical directions. Figure 8 As shown, the second elastic buffer zone 210 is a structure formed by a plurality of hollow rounded rectangular holes staggered in the horizontal and vertical directions. Fig. 9 As shown, the second elastic buffer 210 can also be a structure formed by a disconnected opening, so as to utilize the opening space as an elastic space on the first support structure 200 to meet the bending requirements of the first support structure 200 and release the squeezing force of the first support structure 200 in the bending area A. Fig. 9 As shown, the opening located in the second elastic buffer zone 210 may be completely disconnected from the first support structure 200 in the lateral direction, or may not be completely disconnected. The length and width of the opening may be selected according to actual conditions and are not specifically limited herein.

[0065] According to an exemplary embodiment, most of the contents of the display module of this embodiment are the same as those of the above embodiment. The difference between this embodiment and the above embodiment is that, Fig.10 As shown, the surfaces of the first supporting structure 200 and the second supporting structure 300 are connected by a second adhesive layer 500, wherein a third elastic buffer zone 510 is provided at the bending area A in the second adhesive layer 500, wherein the structure of the third elastic buffer zone 510 is the same as or different from the structure of the first elastic buffer zone 310 and / or the second elastic buffer zone 210.

[0066] For example, the third elastic buffer 510 is a disconnected opening structure. Fig.10 As shown, the third elastic buffer 510 includes a first opening. For example, the third elastic buffer 510 can be formed by the first opening, and the first opening penetrates the second adhesive layer 500 in the thickness direction to prevent cracking between the first support structure 200 and the second adhesive layer 500 in the bending area A, and sufficient elastic space can be reserved for the first support structure 200 in the bending area A. The thickness direction of the first opening is perpendicular to the direction of the foldable display layer 100.

[0067] In an exemplary embodiment, the third elastic buffer layer 510 may also be formed of a third adhesive layer of a material different from that of the second adhesive layer. Fig.11 As shown, the first opening located in the bending area A is filled with a third adhesive layer 520, and the elastic modulus of the third adhesive layer 520 is higher than the elastic modulus of the second adhesive layer 500 located in the flat area B. For example, the third adhesive layer 520 is a soft adhesive PSA (pressure-sensitive adhesive), and the second adhesive layer 500 located in the flat area B is a high-modulus and high-strength PU adhesive (polyurethane adhesive) or resin adhesive.

[0068] According to an exemplary embodiment, most of the contents of the display module of this embodiment are the same as those of the above embodiment. The difference between this embodiment and the above embodiment is that, Fig.12 As shown, the second support structure 300 is a multi-layer structure, and the second support structure 300 includes a first support layer 301, and a fourth adhesive layer 302 and a second support layer 303 located successively below the first support layer 301, wherein a fourth elastic buffer zone 320 is provided on the fourth adhesive layer 302 and the second support layer 303 located in the bending area A.

[0069] refer to Fig.12 The fourth adhesive layer 302 may be a resin film structure as a whole. The first support layer 301 and the second support layer 303 may be a single film layer structure or a multi-film layer structure. The first support layer 301 and the second support layer 303 may be made of the same or different materials.

[0070] refer to Fig.12a , a schematic diagram of the initial structure of the second support structure 300 of a multi-film layer in an embodiment is exemplified. The initial structure is, for example, a structure before the fourth elastic buffer zone is formed in the second support structure. Among them, the first support layer 301 is a single-layer structure, for example, SUS (stainless steel), the fourth adhesive layer 302 is, for example, a resin adhesive film, the second support layer 303 is a multi-layer carbon fiber composite material, and the second support layer 303 includes a first sub-support layer 3031 and a second sub-support layer 3032, for example, the first sub-support layer 3031 is a carbon fiber layer with a fiber direction of 90°, and the second sub-support layer 3032 is a carbon fiber layer with a fiber direction of 0°. In this embodiment, exemplarily, the thickness of the first support layer 301 is, for example, 25μm, the thickness of the fourth adhesive layer 302 is 60μm, and the thickness of the first sub-support layer 3031 and the second sub-support layer 3032 are both 30μm. In this embodiment, stainless steel is partially used in the second support structure 300 to reduce the weight of the second support structure 300, thereby achieving lightweight processing for the entire display module.

[0071] refer to Figure 12b, exemplarily shows a schematic diagram of the initial structure of the second support structure of a multi-film layer in another embodiment. Wherein, the first support layer 301 and the second support layer 303 are both multi-layer carbon fiber composite materials, and are connected by the fourth adhesive layer 302, and the fourth adhesive layer 302 is, for example, a resin adhesive film. Wherein, the first support layer 301 and the second support layer 303 are both the first sub-support layer 3031 and the second sub-support layer 3032 stacked from top to bottom, wherein the first sub-support layer 3031 is a carbon fiber layer with a fiber direction of 90°, for example, the second sub-support layer 3032 is a carbon fiber layer with a fiber direction of 0°. In this embodiment, exemplarily, the thickness of the fourth adhesive layer 302 is 50μm, and the thickness of the first sub-support layer 3031 and the second sub-support layer 3032 are both 30μm. In this embodiment, the thickness of the interlayer between the two carbon fiber layers with a fiber direction of 90° is the same as the thickness of the interlayer between the two carbon fiber layers with a fiber direction of 0°, so that the bending performance of the two carbon fiber layers with different fiber directions in the bending zone remains consistent.

[0072] refer to Fig.12c , a schematic diagram showing the initial structure of the second support structure of multiple membrane layers in another embodiment is shown as an example. Wherein, the first support layer 301 and the second support layer 303 are both multi-layer carbon fiber composite materials, and are connected by the fourth adhesive layer 302, and the fourth adhesive layer 302 is, for example, a resin adhesive film. Wherein, the first support layer 301 is a second sub-support layer 3032 and a first sub-support layer 3031 stacked from top to bottom, and the second support layer 303 is a first sub-support layer 3031 and a second sub-support layer 3032 stacked from top to bottom, wherein the first sub-support layer 3031 is a carbon fiber layer with a fiber direction of 90°, for example, the second sub-support layer 3032 is a carbon fiber layer with a fiber direction of 0°. In this embodiment, exemplarily, the thickness of the fourth adhesive layer 302 is 50μm, and the thickness of the first sub-support layer 3031 and the second sub-support layer 3032 are both 30μm. In this embodiment, the interlayer thickness between two carbon fiber layers with a fiber direction of 90° is less than the interlayer thickness between two carbon fiber layers with a fiber direction of 0°, thereby making the two carbon fiber layers with a fiber direction of 0° have better bending performance in the bending zone, which is beneficial to the bending of the entire display module.

[0073] refer to Fig.12As shown, the second support structure 300 is composed of a first support layer 301, a fourth adhesive layer 302 and a second support layer 303 stacked in sequence from top to bottom. Compared with the single-layer carbon fiber board in the prior art, it can balance the cost and lightweight, and realize the lightweight demand of the display module. The first support layer 301 is connected to the surface of the first support structure 200 away from the foldable display layer 100 through the second adhesive layer 500. For example, the second adhesive layer 500 is made of PSA glue of the same material as a whole. A first elastic buffer 310 is provided on the first support layer 301 located in the bending area A, and a fourth elastic buffer 320 is provided on the fourth adhesive layer 302 and the second support layer 303 located in the bending area A, so as to meet the tensile strength and elastic strength of the back of the entire display module at the bending area A through the fourth elastic buffer 320, so as to meet the folding requirements and improve the anti-extrusion performance.

[0074] In an exemplary embodiment, reference Fig.12 The fourth elastic buffer zone 320 includes a first sub-buffer zone 321 disposed in the fourth adhesive layer and a second sub-buffer zone 322 disposed in the second supporting layer 303 . The structures of the first sub-buffer zone 321 and the second sub-buffer zone 311 may be the same or different.

[0075] refer to Fig.12 As shown, taking the different structures of the first sub-buffer zone 321 and the second sub-buffer zone 322 as an example, for example, the first sub-buffer zone (the fourth elastic buffer zone disposed on the fourth adhesive layer) 321 is formed by a soft adhesive PSA with a high elastic modulus, and the fourth adhesive layer 302 other than the first sub-buffer zone 321 is a high modulus and high strength PU adhesive or resin adhesive. The structure of the second sub-buffer zone 322 (the fourth elastic buffer zone disposed on the second supporting layer) is the same as the structure of the first elastic buffer zone 310 disposed in the first supporting layer 301, for example, both are mesh structures and the distribution positions are also the same.

[0076] In other example embodiments, reference Fig.13 The structure of the fourth elastic buffer zone (the second sub-buffer zone 322 ) disposed on the second supporting layer 303 may be different from the structure of the first elastic buffer zone 310 disposed on the first supporting layer 301 , and the distribution may also be different.

[0077] refer to Fig.14As shown, the fourth elastic buffer disposed on the fourth adhesive layer is the same as the fourth elastic buffer disposed on the second supporting layer. For example, the fourth elastic buffer 320 disposed on the fourth adhesive layer and on the second supporting layer includes a second opening. For example, the fourth elastic buffer 320 can be formed by the second opening, and the second opening penetrates the total thickness of the fourth adhesive layer and the second supporting layer in the thickness direction. When the first elastic buffer 310 of the first supporting layer 301 meets the bending requirement, the second opening is used to meet the folding requirement of the entire display module. At the same time, the second opening can also reserve more design space for the hinge in the display device. Among them, the thickness direction of the second opening is the direction perpendicular to the foldable display layer 100.

[0078] In some exemplary embodiments, reference Fig.15 As shown, the fourth elastic buffer zone can also be formed by the fifth adhesive layer 330 filled in the second opening, and the elastic modulus of the fifth adhesive layer 330 is higher than the elastic modulus of the fourth adhesive layer 302 located in the flat area B. Exemplarily, the fourth adhesive layer 302 located in the flat area B is a high modulus and high strength PU glue or resin glue, and the fifth adhesive layer 330 is composed of a soft glue PSA with a high elastic modulus, thereby forming a high elastic buffer zone for the bending area A.

[0079] In an exemplary embodiment of the present disclosure, a foldable display screen is provided. The foldable display screen may be a touch screen, an LED display panel, a liquid crystal display panel, an OLED display panel, etc., and no specific limitation is made here. In this embodiment, the foldable display screen may be formed by using the display module provided in the above embodiment. Exemplarily, the first supporting structure is used in the display module as a supporting member of the foldable display layer, which can provide sufficient supporting capacity when the bending area is squeezed or pressed by an external force, and compensate for the pressure, thereby improving the anti-extrusion capacity of the display module, thereby preventing the phenomenon of GDS (black mass) appearing in the bending area of ​​the foldable display layer when it is pressed.

[0080] A display device is provided in an exemplary embodiment of the present disclosure, and the display device includes: the display module of the above-mentioned embodiment. When the display device adopts the display module of the above-mentioned embodiment for display, the first supporting structure is adopted in the display module as the supporting member of the foldable display layer, which can provide sufficient supporting capacity when the bending area is squeezed or pressed by external force, thereby improving the anti-extrusion capacity of the display module and compensating for the pressure, thereby preventing the GDS (black group) phenomenon from occurring in the bending area of ​​the foldable display layer when the foldable display layer is pressed.

[0081] In the present disclosure, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that an article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such article or device. In the absence of more restrictions, an element defined by the sentence "comprising..." does not exclude the presence of additional identical elements in the article or device comprising the element.

[0082] The various embodiments in the present disclosure are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0083] The protection scope of the present disclosure is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present disclosure without departing from the scope and spirit of the present disclosure. If these changes and modifications fall within the scope of the claims of the present disclosure and their equivalents, the intention of the present disclosure also includes these changes and modifications.

Claims

1. A display module, characterized in that: The display module comprises: A foldable display layer, the foldable display layer comprising a bending area and a flat area disposed adjacent to the bending area; A first supporting structure, located on the non-display side of the foldable display layer, the first supporting structure is used to support the bending area; the first supporting structure meets at least one of the following conditions: elastic modulus ≥ 60GPa, hardness > 270HV, tensile strength ≥ 700MPa, yield strength ≥ 600Mpa; The second supporting structure is located at a side of the first supporting structure away from the foldable display layer.

2. The display module according to claim 1, characterized in that: The first supporting structure satisfies the following conditions simultaneously: elastic modulus>100GPa, hardness>270HV, tensile strength≥700MPa, and yield strength≥600Mpa.

3. The display module according to claim 1, characterized in that: The material of the first supporting structure includes at least one of the following materials: stainless steel, titanium alloy, and copper alloy.

4. The display module according to any one of claims 1 to 3, characterized in that: The second supporting structure is provided with a first elastic buffer zone, which is located in the bending area and the flat area, and is used to release the pressure at the bending area when the foldable display layer is in a bent state.

5. The display module according to claim 4, characterized in that: The first supporting structure is connected to the foldable display layer through a first adhesive layer. The first supporting structure is provided with a second elastic buffer zone. The second elastic buffer zone is staggered with the first elastic buffer zone. The second elastic buffer zone is used to release the pressure of the first supporting structure in the bending zone.

6. The display module according to claim 5, characterized in that: The first supporting structure is connected to the second supporting structure via a second adhesive layer, wherein the second adhesive layer located in the bending area is provided with a third elastic buffer zone.

7. The display module according to claim 6, characterized in that: The second adhesive layer includes a first opening, where the first opening is located in the third elastic buffer zone, and the first opening penetrates the second adhesive layer in a direction perpendicular to the foldable display layer.

8. The display module according to claim 7, characterized in that: The first opening is filled with a third adhesive layer, and the elastic modulus of the third adhesive layer is higher than the elastic modulus of the second adhesive layer in the flat area.

9. The display module according to claim 6, characterized in that: At least one of the first elastic buffer zone, the second elastic buffer zone, and the third elastic buffer zone includes a mesh structure.

10. The display module according to claim 9, characterized in that: The first elastic buffer, the second elastic buffer and the third elastic buffer have the same mesh structure; or At least two of the first elastic buffer zone, the second elastic buffer zone, and the third elastic buffer zone have different mesh structures.

11. The display module according to claim 4, characterized in that: The second supporting structure at least includes a first supporting layer, and the material of the first supporting layer includes at least one of the following: carbon fiber composite material, stainless steel, and titanium alloy. The first elastic buffer zone is provided on the first supporting layer.

12. The display module according to claim 11, characterized in that: The second supporting structure further comprises a fourth adhesive layer and a second supporting layer sequentially located below the first supporting layer, wherein a fourth elastic buffer zone is disposed on the fourth adhesive layer and the second supporting layer located in the bending area.

13. The display module according to claim 12, characterized in that: The fourth adhesive layer includes a second opening, the second opening is located in the fourth elastic buffer zone, and the second opening penetrates the fourth adhesive layer and the second supporting layer in a direction perpendicular to the foldable display layer.

14. The display module according to claim 13, characterized in that: The second opening is filled with a fifth adhesive layer, and the elastic modulus of the fifth adhesive layer is higher than the elastic modulus of the fourth adhesive layer located in the flat area.

15. A display device, characterized in that: include: A display module as claimed in any one of claims 1 to 14.

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