Display module and display device

Abstract

The application discloses a display module and a display device. The display module has a bending area and a non-bending area on one side of the bending area, and comprises a display panel and a first supporting film. The display panel comprises a first screen body, a bending part and a second screen body, and the elastic modulus of the bending part is smaller than that of the first screen body and the second screen body. The first main body part is arranged in the non-bending area, and the first extension part is arranged in the bending area. The bending area comprises a first thinning area, and the maximum distance between the boundary of the first thinning area and the first screen body in the second direction is less than or equal to the maximum distance between the edge of the first extension part and the first screen body in the second direction. The thickness of the first extension part in the first thinning area is less than the thickness of the first main body part, that is, the part of the first supporting film in the bending area is subjected to a thickness thinning treatment, the supporting effect of the first supporting film at the position is reduced, the stress of the display module in the bending area is effectively reduced, and the failure risk of the bending area caused by stress concentration is reduced.

Description

Technical Field

[0001] This application relates to the field of displays, specifically to a display module and a display device. Background Technology

[0002] Organic light-emitting diodes (OLEDs) and flat panel displays based on light-emitting diodes (LEDs) are widely used in various consumer electronics products such as mobile phones, televisions, laptops, and desktop computers due to their advantages such as high image quality, energy saving, thin body, and wide range of applications, becoming the mainstream of display devices.

[0003] However, the performance of current OLED display products needs to be improved. Summary of the Invention

[0004] This application provides a display module and a display device, which aim to improve the performance of OLED display products.

[0005] The first aspect of this application provides a display module having a bent area and a non-bent area located on one side of the bent area. The display module further includes: a display panel including a first screen body, a bent portion, and a second screen body, wherein the first screen body and the second screen body are located in the non-bent area, the bent portion is located in the bent area, the first screen body and the second screen body are disposed opposite to each other in a first direction, at least a portion of the bent portion is bent and connected between the first screen body and the second screen body, and the elastic modulus of the bent portion is less than the elastic modulus of the first screen body and the second screen body; and a first support film located on the side of the first screen body facing the second screen body and extending along a second direction, the first support film including a first main body portion and a first extension portion connected to each other, the first main body portion being located in the non-bent area, the first extension portion being located in the bent area, the bent area including a first thinning area, the maximum distance between the boundary of the first thinning area and the first screen body in the second direction being less than or equal to the maximum distance between the edge of the first extension portion and the first screen body in the second direction, the thickness of the first extension portion in the first thinning area being less than the thickness of the first main body portion, and the first direction and the second direction intersecting.

[0006] According to an embodiment of the first aspect of this application, the maximum distance between the boundary of the first thinning zone and the first screen body in the second direction is equal to the maximum distance between the edge of the first extension and the first screen body in the second direction.

[0007] According to any of the foregoing embodiments of the first aspect of this application, the width of the first thinning region in the second direction is less than or equal to 1 mm.

[0008] According to any of the foregoing embodiments of the first aspect of this application, along the second direction and in the direction of the first screen body pointing towards the bend, the thickness of the portion of the first extension in the first thinning region tends to decrease.

[0009] According to any of the foregoing embodiments of the first aspect of this application, along the second direction and in the direction of the first screen body pointing towards the bend, the thickness of the first extension in the first thinning region gradually decreases.

[0010] According to any of the foregoing embodiments of the first aspect of this application, the first extension has a side facing the bent portion, the side including one or more of a plane, a curved surface, or a folded surface.

[0011] According to any of the foregoing embodiments of the first aspect of this application, the first extension has a first hollow portion in the first thinning region, and the first hollow portion is disposed through at least a portion of the first extension.

[0012] According to any of the foregoing embodiments of the first aspect of this application, there are multiple first hollow portions, and the multiple first hollow portions are arranged at intervals.

[0013] According to any of the foregoing embodiments of the first aspect of this application, along the second direction and along the direction of the first screen body pointing towards the bend, the size of the plurality of first hollow portions in the first direction tends to increase.

[0014] According to any of the foregoing embodiments of the first aspect of this application, along the second direction and along the direction of the first screen body pointing to the bend, the size of the plurality of first hollow portions gradually increases in the first direction.

[0015] According to any of the foregoing embodiments of the first aspect of this application, the radius of curvature of the bent portion is 0.15 mm to 0.2 mm.

[0016] An embodiment of the second aspect of this application provides a display device that includes a display module of any of the above embodiments.

[0017] According to an embodiment of this application, the display module has a bending area and a non-bending area located on one side of the bending area. The display module includes a display panel and a first support film. The display panel includes a first screen body, a bending portion, and a second screen body. The bending portion connects the first screen body and the second screen body. The elastic modulus of the bending portion is less than the elastic modulus of the first screen body and the second screen body, allowing the display panel to bend at the bending portion, bringing the first screen body and the second screen body closer together, thereby reducing the bezel of the display panel and achieving a narrow bezel design. The first support film includes a first main body and a first extension portion. The first main body is disposed in the non-bending area, and the first extension portion is located in the bending area. The bending area includes a first thinning area. The maximum distance between the boundary of the first thinning area and the first screen body in a second direction is less than or equal to the maximum distance between the edge of the first extension portion and the first screen body in a second direction, that is, the first thinning area is disposed in the area where the first extension portion is located. The thickness of the first extension in the first thinning area is less than the thickness of the first main body. That is, the thickness of the portion of the first support film located in the bending area is reduced, thereby reducing the supporting effect of the first support film at that position, effectively reducing the stress of the display module in the bending area, reducing the risk of failure caused by stress concentration in the bending area, and improving the performance of the display product. Attached Figure Description

[0018] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals denote the same or similar features, and the drawings are not drawn to scale.

[0019] Figure 1 This is a partial cross-sectional view of a display module provided in the first aspect embodiment of this application;

[0020] Figure 2 This is a partial cross-sectional view of a display module provided in another embodiment;

[0021] Figure 3 This is a partial cross-sectional view of a display module provided in yet another embodiment;

[0022] Figure 4 This is a partial cross-sectional view of a display module provided in another embodiment;

[0023] Figure 5 This is a partially enlarged view of the first extension provided in the first aspect embodiment of this application;

[0024] Figure 6 This is a partially enlarged view of the first extension provided in another embodiment;

[0025] Figure 7 This is a partially enlarged view of the first extension provided in yet another embodiment;

[0026] Figure 8 This is a partial cross-sectional view of a display module provided in another embodiment.

[0027] Explanation of reference numerals in the attached figures:

[0028] 10. Display module; 11. Bending area; 12. Non-bending area; 13. First thinning area;

[0029] 100. Display panel; 110. First screen; 120. Second screen; 130. Bending section;

[0030] 200, First support membrane; 210, First main body; 220, First extension; 221, Side surface; 230, First perforated portion;

[0031] 300. Second support membrane;

[0032] 400. Raising blocks;

[0033] 500, composite film layer;

[0034] 600. Protective layer;

[0035] X, the first direction; Y, the second direction. Detailed Implementation

[0036] The features and exemplary embodiments of various aspects of this application will now be described in detail. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain this application and are not configured to limit this application. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples of this application.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0038] It should be understood that when describing the structure of a component, when referring to a layer or region as being "above" or "on top of" another layer or region, it can mean that it is directly above the other layer or region, or that it contains other layers or regions between it and the other layer or region. Furthermore, if the component is flipped over, that layer or region will be located "below" or "under" the other layer or region.

[0039] Flexible organic light-emitting diode (OLED) displays, characterized by active light emission, wide viewing angles, broad color gamut, high brightness, fast response time, and low power consumption, are gradually becoming the mainstream in the market. Furthermore, due to their flexible and foldable structure, they can be used to fabricate various forms of electronic devices. For example, they can be used in foldable screen phones, allowing for the storage of large screens through folding, thus meeting users' demands for large screens and portability.

[0040] With the development of display technology, display panels are being used more and more widely, and the requirements for narrow bezels are becoming increasingly stringent. To achieve a narrow bezel effect, the non-display area of ​​the flexible screen is typically bent to the back of the display panel, using the smallest possible bending radius.

[0041] In flexible panel module packaging technology, to make better use of space and increase the screen-to-body ratio, the chip and screen are bent together to the back of the phone panel, thus achieving a narrow bezel. However, in the screen bending process, when the bending radius is small, it is inevitable that the internal stress of the screen in the bending area will increase, leading to problems such as breakage of internal metal traces or failure of the inner film layer. Therefore, avoiding excessive stress in the bending area of ​​the screen is an important design consideration.

[0042] When the bending radius decreases, the stress does not increase linearly. Instead, when the bending radius is below a certain threshold, the stress increases much faster than linearly. However, the trend towards thinner and lighter mobile phone panels is to address screen failure issues while reducing the bending radius.

[0043] Therefore, in order to solve the screen failure problem, this application provides a display module and a display device. The various embodiments of the display module and display device will be described below with reference to the accompanying drawings. The display module can be an organic light-emitting diode (OLED) display module.

[0044] Please see Figure 1 , Figure 1 This is a partial cross-sectional view of a display module provided in the first aspect of this application.

[0045] like Figure 1 As shown, a first aspect of this application provides a display module 10. The display module 10 has a bending area 11 and a non-bending area 12 located on one side of the bending area 11. The display module 10 further includes a display panel 100, including a first screen 110, a bending portion 130, and a second screen 120. The first screen 110 and the second screen 120 are located in the non-bending area 12, and the bending portion 130 is located in the bending area 11. The first screen 110 and the second screen 120 are disposed opposite to each other in a first direction X. At least a portion of the bending portion 130 is bent and connected between the first screen 110 and the second screen 120. The elastic modulus of the bending portion 130 is less than the elastic modulus of the first screen 110 and the second screen 120. A support film 200 is located on the side of the first screen 110 facing the second screen 120 and extends along the second direction Y. The first support film 200 includes a first main body 210 and a first extension 220 connected to each other. The first main body 210 is located in the non-bending region 12, and the first extension 220 is located in the bending region 11. The bending region 11 includes a first thinning region 13. The maximum distance between the boundary of the first thinning region 13 and the first screen 110 in the second direction Y is less than or equal to the maximum distance between the edge of the first extension 220 and the first screen 110 in the second direction Y. The thickness of the first extension 220 in the first thinning region 13 is less than the thickness of the first main body 210. The first direction X and the second direction Y intersect.

[0046] According to an embodiment of this application, the display module 10 has a bending area 11 and a non-bending area 12 located on one side of the bending area 11. The display module 10 includes a display panel 100 and a first support film 200. The display panel 100 includes a first screen body 110, a bending portion 130, and a second screen body 120. The bending portion 130 connects the first screen body 110 and the second screen body 120. The elastic modulus of the bending portion 130 is less than the elastic modulus of the first screen body 110 and the second screen body 120, so that the display panel 100 can be bent at the bending portion 130, so that the first screen body 110 and the second screen body 120 are brought closer to each other, thereby reducing the bezel of the display panel 100 and realizing a narrow bezel design. The first support film 200 includes a first main body 210 and a first extension 220. The first main body 210 is disposed in the non-bending region 12, and the first extension 220 is located in the bending region 11. The bending region 11 includes a first thinning region 13. The maximum distance between the boundary of the first thinning region 13 and the first screen body 110 in the second direction Y is less than or equal to the maximum distance between the edge of the first extension 220 and the first screen body 110 in the second direction Y. That is, the first thinning region 13 is disposed in the region where the first extension 220 is located. The thickness of the first extension 220 in the first thinning region 13 is less than the thickness of the first main body 210. That is, the thickness of the portion of the first support film 200 located in the bending region 11 is thinned, reducing the supporting effect of the first support film 200 at this position, effectively reducing the stress of the display module 10 in the bending region 11, reducing the risk of failure due to stress concentration in the bending region 11, and improving the performance of the display product.

[0047] The area where the first extension 220 is located refers to the internal area enclosed by the outer contour line of the first extension 220.

[0048] The modulus of elasticity can be considered an indicator of how easily a material undergoes elastic deformation. The higher the value, the greater the stress required to induce a certain elastic deformation, meaning the material is more stiff and, under a given stress, undergoes less elastic deformation. The modulus of elasticity refers to the stress required for a material to produce a unit elastic deformation under external force. It reflects a material's ability to resist elastic deformation, equivalent to the stiffness of a common spring.

[0049] In some alternative embodiments, the maximum distance between the boundary of the first thinning region 13 and the first screen body 110 in the second direction Y is equal to the maximum distance between the edge of the first extension 220 and the first screen body 110 in the second direction Y.

[0050] In these alternative embodiments, by aligning the boundary of the first thinning region 13 with the edge of the first extension 220, the thinning process is ensured to act strictly on the first extension 220 of the bending region 11, avoiding interference with the first main body 210 of the non-bending region 12. This preserves the complete support performance (such as stiffness and resistance to deformation) of the main body and prevents performance degradation in unintended areas due to uncontrolled thinning. Aligning the boundary of the first thinning region 13 with the edge of the first extension 220 concentrates the thinning process on the most dangerous areas of bending stress (such as metal traces or film layer junctions). By locally reducing the equivalent modulus of the first support film 200, bending stress is effectively dispersed, preventing stress concentration.

[0051] Please see Figure 1 and Figure 2 , Figure 2 This is a partial cross-sectional view of a display module provided in another embodiment.

[0052] like Figure 1 and Figure 2 As shown, in some optional embodiments, the width L of the first thinning region 13 in the second direction Y is less than or equal to 1 mm. For example, the width of the first thinning region 13 in the second direction Y is 0.1 mm, 0.3 mm, 0.5 mm, or 1 mm.

[0053] In these optional embodiments, by limiting the width of the first thinning region 13 to less than 1 mm, it is ensured that the thinning process only acts on the stress concentration danger area of ​​the bending region 11 (such as metal traces or film layer bonding), avoiding the weakening of the support function of non-target areas due to an excessively large range. Limiting the width of the first thinning region 13 to less than 1 mm solves the stress concentration problem in the bending region 11 and avoids damage to the mechanical properties of other areas of the first support film 200 (such as non-bending region 12), ensuring that the overall deformation resistance and tensile strength of the first support film 200 are preserved, and guaranteeing the structural reliability of the display module 10. The small range of the first thinning region 13 reduces the requirements for processing accuracy, while simplifying the positioning and etching / thinning processes in the manufacturing process, improving production yield and product consistency. The narrow width of the first thinning region 13 allows for adjustment of the equivalent modulus of the first support film 200 within a very small range, thereby reducing the stress in the bending region 11 while supporting a smaller bending radius (such as the narrow bezel design of mobile phones and wearable devices), meeting the space compression requirements of the industry's trend towards thinner and lighter designs.

[0054] like Figure 1 and Figure 2 As shown, in some alternative embodiments, the thickness of the first extension 220 in the portion of the first thinning region 13 tends to decrease along the second direction Y and along the direction from the first screen body 110 to the bend 130.

[0055] In these alternative embodiments, the thickness of the first extension 220 in the first thinning region 13 decreases along the second direction Y from the first screen 110 to the bending portion 130, forming a gradient thinning structure and reducing the abrupt stiffness change of the first support film 200 in the bending region 11. This design allows the bending stress to be gradually released within the first thinning region 13, significantly reducing the risk of stress concentration. The thinning trend direction (from the first screen 110 to the bending portion 130) is consistent with the actual force direction during the bending process. By directionally adjusting the equivalent modulus of the first support film 200, the stress distribution requirements of the bending region 11 are precisely matched, and the position of the neutral layer is optimized, thereby dispersing the bending stress more efficiently.

[0056] The equivalent elastic modulus is an important concept in mechanics of materials, used to describe the overall elastic behavior of materials under complex stress states. It simplifies the analysis of the elastic response of materials under specific conditions by combining various elastic moduli (such as Young's modulus, shear modulus, bulk modulus, etc.).

[0057] The larger the equivalent elastic modulus, the greater the stress that causes the material to undergo a certain elastic deformation, that is, the greater the material stiffness, which means that under a certain stress, the elastic deformation is smaller.

[0058] In some alternative embodiments, the thickness of the first extension 220 gradually decreases in the portion of the first thinning region 13 along the second direction Y and in the direction from the first screen body 110 to the bend 130.

[0059] In these optional embodiments, the thickness of the first extension 220 in the first thinning region 13 gradually decreases along the second direction Y from the first screen 110 to the bending portion 130, forming a gradient thinning structure and reducing the abrupt change in stiffness of the first support film 200 in the bending region 11. This design allows the bending stress to be gradually released within the first thinning region 13, further reducing the risk of stress concentration. The thinning trend direction (from the first screen 110 to the bending portion 130) is consistent with the actual force direction during bending. By directionally adjusting the equivalent modulus of the first support film 200, it precisely adapts to the stress distribution requirements of the bending region 11, optimizes the neutral layer position, and thus more efficiently disperses the bending stress. Gradual thinning (rather than a step-like abrupt change) maintains the material continuity of the first support film 200 in the first thinning region 13, avoiding local tearing or crack propagation caused by a sudden drop in thickness, and improving the structural durability of the bending region 11. According to simulation results, this design can reduce the maximum stress of the metal trace by about 40%, significantly reducing the risk of fracture.

[0060] Please see Figures 1 to 3 , Figure 3 This is a partial cross-sectional view of a display module provided in another embodiment.

[0061] like Figures 1 to 3As shown, in some optional embodiments, the first extension 220 has a side surface 221 facing the bent portion 130, which includes one or more of a plane, a curved surface, or a folded surface. The planar, curved, or folded surface design of the side surface 221 can be flexibly selected according to the bending requirements (such as bending radius and angle) of different products. For example, the cross-sectional shape of the side surface 221 can be a concave curve, a convex curve, or a polyline, etc.

[0062] In these alternative embodiments, the planar surface is suitable for scenarios with small bending curvature or requiring uniform support, simplifying the manufacturing process. The curved surface matches the natural curvature of the bending area 11, reducing stress concentration points and optimizing the neutral layer distribution. The curved surface can also guide bending stress along a smooth path, avoiding sudden changes in local stress. The folded surface (polyline or stepped) disperses stress through segmented support, adapting to complex bending paths. The curved or folded surface design avoids sharp edges, reducing the risk of film peeling between the first support film 200 and the first screen 110 during bending due to friction or compression. The planar surface, on the other hand, maintains material continuity through uniform thinning, preventing crack propagation.

[0063] Please see Figures 4 to 6 , Figure 4 This is a partial cross-sectional view of a display module provided in another embodiment; Figure 5 This is a partially enlarged view of the first extension provided in the first aspect embodiment of this application; Figure 6 This is a partial enlarged view of the first extension provided in another embodiment.

[0064] like Figures 4 to 6 As shown, in some optional embodiments, the first extension 220 has a first hollow portion 230 in the first thinning region 13, and the first hollow portion 230 is disposed through at least a portion of the first extension 220.

[0065] In these optional embodiments, by adding a first hollow portion 230 to the first thinning region 13, the equivalent elastic modulus of the first support film 200 in this region is further reduced, which can significantly weaken the local support effect of the first support film 200 on the screen, thereby dispersing bending stress more efficiently. The shape of the first hollow portion 230 (such as circular, strip, or grid) can guide the bending stress to be transmitted along a specific path, avoiding stress concentration at metal traces or film layer joints. For example, a linear first hollow portion 230 can extend along the bending direction, promoting uniform stress distribution; a discrete first hollow portion 230 reduces peak stress through multi-point buffering. The first hollow design reduces stress while reducing material usage, achieving both lightweighting and improving the flexibility of the bending region 11, adapting to smaller bending radius requirements (such as ultra-narrow bezel designs for mobile phones), and conforming to the industry trend of thinner and lighter designs. The distribution density and penetration depth of the first cutout portion 230 can be precisely controlled (e.g., penetrating only the first extension portion 220), reducing the modulus while maintaining sufficient structural continuity, avoiding the risk of tearing of the first support film 200 or screen delamination caused by excessive cutouts. The pattern of the first cutout portion 230 can be customized according to specific product requirements, adapting to different bending shapes (e.g., the U-shaped bend of a folding screen or the L-shaped bend of a wearable device), providing a technical basis for diversified terminal designs.

[0066] like Figure 6 As shown, optionally, the first hollow portion 230 is provided with a first extension portion 220 that penetrates in the first direction X, that is, the first hollow portion 230 is a blind groove structure.

[0067] like Figure 5 As shown, optionally, the first hollow portion 230 is configured to penetrate the entire first extension portion 220 in the first direction X, that is, the first hollow portion 230 is a through groove structure.

[0068] In some optional embodiments, there are multiple first hollow portions 230, which are arranged at intervals. The first hollow portions 230 are disposed in the first thinning area 13, and multiple first hollow portions 230 are disposed in multiple first thinning areas 13, that is, one first hollow portion 230 and one first thinning area 13 are correspondingly disposed.

[0069] In these optional embodiments, multiple spaced-apart first cutouts 230 disperse bending stress over a wider area, avoiding localized stress concentration that might be caused by a single cutout. By discretizing stress release points, the neutral layer distribution is further optimized, making the stress distribution at metal traces or film layer junctions more uniform and reducing peak stress. The spaced-apart first cutouts 230 can form an alternating "soft-hard" gradient modulus distribution within the thinning area, ensuring the flexibility of the first support film 200 in the first cutout area (adapting to small bending radius requirements) while retaining some support through the spaced areas, preventing excessive deformation or delamination of the screen due to a sudden drop in modulus during bending. Multiple small-sized first cutouts 230 replace a single large cutout, reducing material usage (lightweighting) while maintaining the structural continuity of the first support film 200 through the spaced areas, avoiding the tensile strength reduction problem caused by large-area cutouts, and ensuring the overall reliability of the bending area 11. The spacing design blocks the propagation path of potential cracks. Even if a microcrack is generated at a certain hollow edge due to bending fatigue, the adjacent spacing area can inhibit its propagation and improve the durability of the support membrane.

[0070] Please see Figure 4 and Figure 7 , Figure 7 This is a partial enlarged view of the first extension provided in yet another embodiment.

[0071] like Figure 4 and Figure 7 As shown, in some optional embodiments, along the second direction Y and in the direction from the first screen body 110 to the bending portion 130, the size of the plurality of first cutout portions 230 in the first direction X tends to increase.

[0072] In these optional embodiments, the size of the first hollow portion 230 in the first direction X tends to increase along the second direction Y, forming a gradual hollow distribution "from shallow to deep". This design causes the equivalent modulus of the first support film 200 to gradually decrease along the second direction Y, precisely matching the curvature change of the bending region 11 (such as a scenario where the bending radius gradually decreases), avoiding local stress concentration caused by abrupt changes in modulus, optimizing the stress distribution of the metal traces, and reducing peak stress. The incremental design of the size of the first hollow portion 230 can guide the stress to be released gradually along the second direction Y, avoiding stress concentration at a fixed position, thereby reducing the risk of metal trace or film layer fracture. The incrementally sized hollow design avoids the periodic stress concentration points that may be caused by uniform hollowing, and breaks the potential crack propagation path through asymmetric distribution, thereby improving the fatigue resistance of the first support film 200 under repeated bending scenarios.

[0073] In some alternative embodiments, the size of the plurality of first cutout portions 230 gradually increases in the first direction X along the second direction Y and along the direction from the first screen body 110 to the bend portion 130.

[0074] In these optional embodiments, the size of the first hollow portion 230 gradually increases along the second direction Y in the first direction X, forming a gradual hollow distribution from shallow to deep. This design causes the equivalent modulus of the first support film 200 to gradually decrease along the second direction Y, precisely matching the curvature change of the bending region 11 (such as in scenarios where the bending radius gradually decreases), avoiding local stress concentration caused by abrupt changes in modulus, optimizing the stress distribution of the metal traces, and reducing peak stress. The incremental design of the size of the first hollow portion 230 can guide the stress to be released gradually along the second direction Y, avoiding stress concentration at a fixed position, thereby reducing the risk of metal trace or film layer fracture. The incrementally sized hollow design avoids periodic stress concentration points that may be caused by uniform hollowing, and breaks the potential crack propagation path through asymmetric distribution, thereby improving the fatigue resistance of the first support film 200 under repeated bending scenarios.

[0075] Optionally, along the second direction Y and in the direction from the first screen body 110 to the bent portion 130, the opening area of ​​the plurality of first hollow portions 230 gradually increases. For example, when the first hollow portion 230 is a circular hollow, it can be considered that the diameter of the plurality of first hollow portions 230 gradually increases.

[0076] The opening area of ​​the first hollow section 230 gradually increases along the second direction Y, forming a gradual hollow distribution from small to large. This design causes the equivalent modulus of the first support membrane 200 to gradually decrease along the second direction Y, precisely matching the curvature change of the bending zone 11 (such as in scenarios where the bending radius gradually decreases), avoiding local stress concentration caused by abrupt changes in modulus, optimizing the stress distribution of the metal traces, and reducing peak stress. The incremental design of the size of the first hollow section 230 can guide the stress to be released gradually along the second direction Y, avoiding stress concentration at a fixed position, thereby reducing the risk of metal trace or membrane fracture. The incrementally sized hollow design avoids the periodic stress concentration points that may be caused by uniform hollowing, and breaks the potential crack propagation path through asymmetric distribution, thereby improving the fatigue resistance of the first support membrane 200 under repeated bending scenarios.

[0077] Optionally, along the second direction Y and in the direction from the first screen body 110 to the bending portion 130, the spacing between adjacent first hollow portions 230 gradually decreases, forming a gradual hollow distribution from sparse to dense. This design causes the equivalent modulus of the first support film 200 to gradually decrease along the second direction Y, precisely matching the curvature change of the bending area 11 (such as a scenario where the bending radius gradually decreases), avoiding local stress concentration caused by abrupt changes in modulus, optimizing the stress distribution of the metal traces, and reducing peak stress.

[0078] Optionally, along the second direction Y and in the direction from the first screen body 110 to the bending portion 130, the material modulus of the first support film 200 gradually decreases (e.g., the first support film 200 includes a polyimide (PI) substrate, in which flexible nanoparticles are incorporated, and the content of the flexible nanoparticles changes in a gradient along the second direction Y and in the direction from the first screen body 110 to the bending portion 130).

[0079] In some alternative embodiments, the radius of curvature of the bend 130 is 0.15 mm to 0.2 mm. For example, the radius of curvature of the bend 130 is 0.15 mm, 0.17 mm, 0.18 mm, or 0.2 mm.

[0080] In these optional embodiments, the extremely small radius of curvature of 0.15mm to 0.2mm greatly compresses the bending portion 130, significantly reducing the space occupied by the display module 10 in the non-display area. This directly supports the ultra-narrow bezel design of products such as mobile phones and wearable devices, meeting the industry's urgent need for increased screen-to-body ratio. While ensuring bending reliability, the radius of curvature is compressed to 0.15mm to 0.2mm, and structural optimization (such as a 40% reduction in metal trace stress) offsets the high stress risk caused by the small radius. In repeated bending scenarios, the extremely small radius of curvature is prone to fatigue failure. However, by setting the upper limit (0.2mm) and lower limit (0.1mm) of curvature, combined with the gradient modulus design of the first support film 200 (such as the gradual change in size of the first hollow portion 230), crack initiation and propagation can be suppressed, improving product lifespan.

[0081] like Figures 1 to 7 As shown, the extremely small radius of curvature places higher demands on stress control in the bending area 11. The design of the first support film 200 with gradual thinning (L≤1mm) and the first hollow part 230 with interval arrangement in this solution, through precise control of the equivalent modulus, effectively disperses local stress concentration and ensures that the screen body will not break or delaminate under this radius of curvature.

[0082] Optionally, the thickness of the first support film 200 is 60μm to 100μm, for example, the thickness of the first support film 200 is 60μm, 70μm, 88μm, or 100μm.

[0083] In these optional embodiments, a thickness range of 60μm to 100μm ensures sufficient mechanical strength (such as tensile and compressive strength) for the first support film 200 while avoiding increased stress in the bending area 11 due to excessive thickness. This thickness design maintains a relatively high thickness (e.g., close to 100μm) in the first main body portion 210 (non-bending area 12) to maintain overall support performance, while the first extension portion 220 (bending area 11) is thinned to a lower thickness (e.g., thinning within the range of L≤1mm) to adapt to the requirement of small bending radius, achieving a dynamic balance between support and flexibility. This thickness range is highly consistent with the trend of thinner and lighter mobile phones and wearable devices, which can meet the space compression requirements of screen packaging for support film thickness, while avoiding the risk of deformation or tearing of the first support film 200 due to excessive thinness (e.g., <60μm), thus ensuring the structural stability of the display module 10. When thinning or hollowing out the extension of the bending region 11, the initial thickness (60μm to 100μm) provides sufficient design margin for local structural optimization. Thinning from the initial thickness (e.g., 80μm) to the target value (e.g., 30μm) can significantly reduce the equivalent modulus and avoid a surge in processing difficulty due to excessively thin substrate. The initial thickness ensures that the residual structure in the spaced area of ​​the first hollowed-out portion 230 still has sufficient strength to prevent the support film from breaking or delaminating during bending. The thickness of 60μm to 100μm provides sufficient material redundancy for the bending region 11. During repeated bending (e.g., opening and closing of a folding screen), even with local thinning or hollowing out, the long-term structural reliability can still be maintained through the complete thickness of the first main body portion 210, suppressing fatigue crack propagation.

[0084] Optionally, the display module 10 further includes a second support film 300, which is located on the side of the second screen 120 facing the first screen 110 and extends along the second direction Y. Optionally, the second support film 300 is located in the bending area 11 and the non-bending area 12, forming support for the bending portion 130 and the second screen 120. In order to alleviate the stress concentration on the side of the bending portion 130 facing the second screen 120, the second support film 300 can be subjected to a thinning treatment similar to or the same as that of the first support film 200 (for example, along the second direction Y and along the direction of the second screen 120 pointing to the bending portion 130, the thickness of part of the second support film 300 gradually decreases, or the second support film 300 is provided with a second hollow portion, which penetrates at least part of the second support film 300), which will not be described in detail here.

[0085] Optionally, the thickness of the bending portion 130 is less than the thickness of the first screen body 110 and the second screen body 120, so that the bending portion 130 is thinner, which makes it easier for the display panel 100 to be bent at the bending portion 130 position.

[0086] Please see Figure 8 , Figure 8 This is a partial cross-sectional view of a display module provided in another embodiment.

[0087] like Figure 8 As shown, optionally, the display module 10 also includes a shim block 400, which is disposed between the first support film 200 and the second support film 300. By precisely controlling the spacing between the first support film 200 and the second support film 300, the shim block 400 can optimize the position of the neutral layer in the bending area 11 and reduce the tensile / compressive stress of the screen metal traces or film layers. The intervention of the shim block 400 can further disperse the interlayer shear force and suppress the risk of delamination. The shim block 400 is selectively distributed in key areas (such as the junction of the bending area 11 and the non-bending area 12, and the chip packaging site) to specifically improve the local compressive strength and prevent the first support film 200 and the second support film 300 from collapsing or deforming due to external extrusion or repeated bending, thus ensuring the long-term reliability of the display module 10. The shim block 400 adopts low-density materials (such as foamed polymers, hollow microspheres) or hollow structure design to reduce weight increase while providing support, ensuring that the overall thickness of the display module 10 meets the requirements for thinness and lightness.

[0088] Optionally, the material of the raised block 400 includes a wave-absorbing material, enabling the raised block 400 to function as an electromagnetic shield. Optionally, the material of the raised block 400 also includes polyester resin (Polyethylene terephthalate; PET), polyimide (Polyimide; PI), etc.

[0089] Optionally, the display module 10 further includes a composite film layer 500, which is located between the first support film 200 and the second support film 300. Optionally, the composite film layer 500 is located between the first support film 200 and the shim block 400. Optionally, the composite film layer 500 includes an SCF (Super Clean Foam) assembly, which includes an adhesive layer, a buffer layer, and a metal layer sequentially stacked along a first direction X. The adhesive layer is used to bond the buffer layer and the first support film 200 of the display panel 100. The buffer layer enhances the impact resistance of the display module 10. The metal layer further increases the strength and toughness of the display module 10, thereby increasing the drop resistance of the display module 10 and further enhancing the protective effect of the composite film layer 500 on the display panel 100.

[0090] The cushioning layer is made of materials that are elastic, lightweight, flexible, and ultra-thin, such as foam. The metal layer is made of a highly ductile metal, such as copper foil.

[0091] Optionally, the display module 10 further includes a protective layer 600, which is disposed on the bending portion 130, and the protective layer 600 and the first support film 200 are respectively disposed on both sides of the display panel 100. The protective layer 600 can provide protection to the bending portion 130. For example, metal traces are provided in the bending portion 130, and the protective layer 600 can provide protection to the metal traces, thereby improving the service life of the display module 10.

[0092] Optionally, the display module 10 also includes a polarizer, which is disposed on the side of the display panel 100 away from the first support film 200. The polarizer can filter natural light and reduce the amount of reflected light, thereby improving the display effect of the display module 10.

[0093] Optionally, the display module 10 also includes a cover plate, which is adhered to the side of the polarizer facing away from the display panel 100. The cover plate can provide protection for components such as the polarizer and the display panel 100, thereby improving the service life of the display module 10.

[0094] The cover plate can be a flat cover plate that covers the first screen 110. Alternatively, the cover plate can include a flat portion and a curved portion, with the flat portion covering the screen and the curved portion covering at least a portion of the bend 130.

[0095] A second aspect of the present invention also provides a display device including the display module 10 of any of the first aspect embodiments described above. Since the display device provided by the second aspect of the present invention includes the display module 10 of any of the first aspect embodiments described above, the display device provided by the second aspect of the present invention has the beneficial effects of the display module 10 of any of the first aspect embodiments described above, which will not be elaborated further here.

[0096] The display devices in the embodiments of the present invention include, but are not limited to, mobile phones, personal digital assistants (PDAs), tablet computers, e-books, televisions, access control systems, smart landline phones, control consoles, and other devices with display functions.

[0097] The embodiments described above are not exhaustive, nor do they limit the invention to the specific embodiments described. Clearly, many modifications and variations can be made based on the above description. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to effectively utilize this application and its modifications. This application is limited only by the claims and their full scope and equivalents.

Claims

1. A display module, characterized in that, The display module has a bent area and a non-bent area located on one side of the bent area, and the display module further includes: The display panel includes a first screen body, a bent portion, and a second screen body. The first screen body and the second screen body are located in the non-bending area, and the bent portion is located in the bending area. The first screen body and the second screen body are arranged opposite to each other in a first direction. At least a portion of the bent portion is bent and connected between the first screen body and the second screen body. The elastic modulus of the bent portion is less than the elastic modulus of the first screen body and the second screen body. A first support film is located on the side of the first screen body facing the second screen body and extends along a second direction. The first support film includes a first main body portion and a first extension portion connected to each other. The first main body portion is located in the non-bending area, and the first extension portion is located in the bending area. The bending area includes a first thinning area. The maximum distance between the boundary of the first thinning area and the first screen body in the second direction is less than or equal to the maximum distance between the edge of the first extension portion and the first screen body in the second direction. The thickness of the first extension portion in the first thinning area is less than the thickness of the first main body portion. The first direction and the second direction intersect.

2. The display module according to claim 1, characterized in that, The maximum distance between the boundary of the first thinning zone and the first screen body in the second direction is equal to the maximum distance between the edge of the first extension and the first screen body in the second direction.

3. The display module according to claim 2, characterized in that, The width of the first thinning region in the second direction is less than or equal to 1 mm.

4. The display module according to claim 2, characterized in that, Along the second direction and along the direction from the first screen body toward the bend, the thickness of the first extension in the first thinning region tends to decrease; Preferably, along the second direction and along the direction of the first screen body pointing towards the bend, the thickness of the first extension in the first thinning region gradually decreases.

5. The display module according to claim 4, characterized in that, The first extension has a side facing the bend, the side including one or more of a plane, a curved surface, or a folded surface.

6. The display module according to claim 1, characterized in that, The first extension has a first hollow portion in the first thinning area, and the first hollow portion penetrates at least a portion of the first extension.

7. The display module according to claim 6, characterized in that, There are multiple first hollow portions, and the multiple first hollow portions are arranged at intervals.

8. The display module according to claim 7, characterized in that, Along the second direction and along the direction from the first screen body toward the bent portion, the size of the plurality of first hollow portions tends to increase in the first direction; Preferably, along the second direction and along the direction from the first screen body to the bent portion, the size of the plurality of first hollow portions gradually increases in the first direction.

9. The display module according to claim 1, characterized in that, The radius of curvature of the bent portion is 0.15mm to 0.2mm.

10. A display device, characterized in that, Includes the display module as described in any one of claims 1-9.

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