Display panel and display device

Abstract

The application belongs to the technical field of display, and particularly relates to a display panel and a display device, the display panel comprising a substrate and a plurality of sub-pixels arranged in an array on the substrate, the display panel further comprising: a first reinforcing structure arranged between adjacent sub-pixels arranged along a first direction, and the first reinforcing structure is configured to be capable of responding to a magnetic field to change its mechanical properties to reduce the deformation of the display panel along the first direction; a second reinforcing structure arranged between adjacent sub-pixels arranged along a second direction, and the second reinforcing structure is configured to be capable of responding to a magnetic field to change its mechanical properties to reduce the deformation of the display panel along the second direction; wherein the first direction intersects the second direction. The application can actively regulate and optimize the internal stress distribution of the display panel in the state of bending or curling, thereby significantly improving the structural stability and the display reliability after deformation.

Description

Technical Field

[0001] This application belongs to the field of display technology, specifically relating to a display panel and display device. Background Technology

[0002] Organic light-emitting diode (OLED) display panels have advantages such as self-illumination, high contrast, and wide viewing angle. They include a substrate, a pixel definition layer, a light-emitting functional layer, and an encapsulation layer. OLED devices can be fabricated on flexible substrates, enabling the development of bendable, foldable, and even rollable display devices, which are widely used in smartphones, wearable electronics, and new portable devices.

[0003] However, when existing flexible OLED display panels are repeatedly bent or rolled, the internal functional layers undergo varying degrees of deformation due to the mismatch in the elastic modulus of the materials. This deformation incoordination leads to localized stress concentration, which can easily cause film delamination or interface peeling, thus seriously affecting the structural reliability and lifespan of the panel. Summary of the Invention

[0004] The purpose of this application is to provide a display panel and display device that can actively regulate and optimize the internal stress distribution of the display panel in a bent or rolled state, thereby significantly improving its structural stability and display reliability after deformation.

[0005] A first aspect of this application provides a display panel, including a substrate and a plurality of sub-pixels arranged in an array on the substrate. The display panel further includes: a first reinforcement structure disposed between adjacent sub-pixels arranged along a first direction, and the first reinforcement structure being configured to respond to a magnetic field to change its mechanical properties to reduce the deformation of the display panel along the first direction; and a second reinforcement structure disposed between adjacent sub-pixels arranged along a second direction, and the second reinforcement structure being configured to respond to a magnetic field to change its mechanical properties to reduce the deformation of the display panel along the second direction; wherein the first direction intersects the second direction.

[0006] In one exemplary embodiment of this application, the display panel further includes a pixel definition layer, the pixel definition layer having a pixel definition structure located between adjacent sub-pixels, the first enhancement structure being provided in the pixel definition structure in the first direction, and the second enhancement structure being provided in the pixel definition structure in the second direction.

[0007] In an exemplary embodiment of this application, both the first reinforcing structure and the second reinforcing structure include a reinforcing fiber braid; wherein, the reinforcing fiber braid in the first reinforcing structure has a main fiber extending along the first direction, and the deformation mode and stiffness of the main fiber in the first reinforcing structure can change according to the change of the magnetic field direction; the reinforcing fiber braid in the second reinforcing structure has a main fiber extending along the second direction, and the deformation mode and stiffness of the main fiber in the second reinforcing structure can change according to the change of the magnetic field direction.

[0008] In one exemplary embodiment of this application, when the direction of the magnetic field is perpendicular to the axis of the main fiber, the main fiber undergoes bending deformation and its stiffness increases; when the direction of the magnetic field is parallel to the axis of the main fiber, the stiffness of the main fiber increases.

[0009] In one exemplary embodiment of this application, the volume fill density of the main fibers in the first reinforcing structure and the second reinforcing structure is 10% to 30%.

[0010] In one exemplary embodiment of this application, the display panel further includes an encapsulation layer and a third reinforcement structure disposed within the encapsulation layer. The third reinforcement structure is disposed in the central region surrounded by four adjacent sub-pixels. The third reinforcement structure is configured to respond to a magnetic field to change its mechanical properties in order to reduce the deformation of the display panel in the direction perpendicular to the substrate.

[0011] In an exemplary embodiment of this application, the pixel definition structure is provided with a first groove; the encapsulation layer includes a first inorganic encapsulation layer, an organic encapsulation layer and a second inorganic encapsulation layer stacked together, the first inorganic encapsulation layer is provided with a second groove corresponding to the position of the first groove, a portion of the third reinforcement structure is embedded in the second groove, another portion extends upward and is located in the organic encapsulation layer, and the second inorganic encapsulation layer covers the third reinforcement structure.

[0012] In one exemplary embodiment of this application, the third reinforcement structure includes a reinforcement fiber composite; the reinforcement fiber composite includes a first fiber layer and a second fiber layer inserted in the first fiber layer; the first fiber layer fills and covers the entire bottom surface of the second groove; the reinforcement fibers in the second fiber layer extend from one side of the first fiber layer in a direction away from the pixel definition layer.

[0013] In one exemplary embodiment of this application, the upper surface of the first fiber layer is located at the midpoint between the upper surface of the pixel definition structure and the lower surface of the second inorganic encapsulation layer.

[0014] A second aspect of this application provides a display device, comprising: a magnetic field control unit configured to generate magnetic fields with different directions; and a display panel as described in any of the preceding claims, wherein the magnetic field control unit is capable of altering the mechanical properties of the first reinforcement structure and the second reinforcement structure.

[0015] The display panel and display device of this application have at least the following beneficial effects:

[0016] The display panel and display device provided in this application achieve targeted suppression of internal deformation of the display panel in different directions by respectively setting the first and second reinforcing structures between adjacent sub-pixels arranged along the first and second directions. When the panel is bent or rolled, the magnetic field control unit can generate a magnetic field in a specific direction, causing the reinforcing structure in the corresponding direction to change its stiffness or shape in time, thereby providing directional mechanical support at the deformation site, effectively dispersing and reducing local concentrated stress, and improving the film layer delamination or interface peeling caused by the mismatch of elastic moduli of the materials. Secondly, since the mechanical properties of the reinforcing structure can be dynamically adjusted in real time by the magnetic field control unit, the display panel can actively adapt to different deformation scenarios (such as inward folding, outward folding, or rolling), rather than passively bearing deformation; this intelligent characteristic of perception and response significantly improves the structural recovery ability and long-term reliability of the panel after repeated deformation. Through the synergistic effect of the above technical features, the structural integrity of the flexible display panel under complex deformation is significantly enhanced without significantly increasing the complexity and cost of the process, extending its service life, and ensuring the stability of the display effect during and after deformation.

[0017] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0020] Figure 1 The diagram shows cross-sectional views of the three enhancement structures provided in this application, which are located at different positions in the pixel definition layer.

[0021] Figure 2The diagram shows a top view of the three reinforcement structures provided in this application located at different positions.

[0022] Figure 3 A schematic diagram of the structure of the magnetorheological fiber forming braid and shear structure provided in this application is shown.

[0023] Figure 4 The diagram shows a structure provided in Embodiment 2, in which a fourth reinforcing structure and a fifth reinforcing structure are respectively provided in the black matrix and the sealing element.

[0024] Figure 5 The diagram shows the fifth reinforcement structure with the cover plate bent inward and outward.

[0025] Figure 6 The diagram shows the structure of the fourth reinforcement structure under inward and outward bending of the black matrix.

[0026] Explanation of reference numerals in the attached figures: 10. Substrate; 20. Subpixel; 30a. Magnetorheological fiber; 31. First reinforcement structure; 32. Second reinforcement structure; 33. Third reinforcement structure; 331. First fiber layer; 332. Second fiber layer; 34. Fourth reinforcement structure; 35. Fifth reinforcement structure; 351. Third fiber layer; 352. Fourth fiber layer; 40. Pixel definition layer; 410. Pixel definition structure; 411. First groove; 51. First inorganic encapsulation layer; 510. Second groove; 52. Organic encapsulation layer; 53. Second inorganic encapsulation layer; 60. Color resist layer; 61. Color resist filter; 62. Black matrix; 70. Cover plate; 80. Seal; 100. Display panel; 200. Magnetic field control unit; X, First direction; Y, Second direction; Z, Direction perpendicular to the substrate; B, Magnetic field arrow. Detailed Implementation

[0027] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0028] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "assembly," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0031] Example 1 The display panel 100 of this application is constructed based on a flexible substrate 10 (such as polyimide PI). A thin-film transistor (TFT) array layer, an anode, a pixel definition layer 40 (PDL), an organic light-emitting layer (OLED), a cathode, and a thin-film encapsulation (TFE) layer are sequentially formed thereon. See also... Figure 1 As shown, this application also includes a plurality of sub-pixels 20 arranged in an array on the substrate 10, and an enhancement structure system that can respond to an external magnetic field and actively change its own mechanical properties. This enhancement structure system can provide directional mechanical support when the display panel 100 is bent or rolled, thereby reducing deformation and improving structural stability.

[0032] In some embodiments, see Figure 2 As shown, sub-pixels 20 arranged in the same column along the second direction Y (column direction, Y direction) emit the same color, for example, all of them are one of red (R), green (G), or blue (B), thus forming a monochromatic pixel column. In the same row arranged along the first direction X (row direction, X direction), adjacent sub-pixels 20 emit different colors, for example, alternating in the order of R, G, B, forming a periodic color sequence. This arrangement of same color in the same column and different colors in the same row is an implementation of RGB stripe arrangements or other similar pixel layouts commonly used in the art, which is beneficial for improving the color uniformity, visual resolution, and driving efficiency of the display panel 100.

[0033] In some embodiments, see Figure 1 and Figure 2As shown, the enhancement structure system includes a first enhancement structure 31 and a second enhancement structure 32. The first enhancement structure 31 is disposed between adjacent sub-pixels 20 arranged along a first direction X (e.g., the row direction X of the display panel 100). The second enhancement structure 32 is disposed between adjacent sub-pixels 20 arranged along a second direction Y (e.g., the column direction Y of the display panel 100). The first direction X and the second direction Y intersect in the plane of the substrate 10; for example, the first direction X may be perpendicular to the second direction Y.

[0034] The first reinforcement structure 31 and the second reinforcement structure 32 are both configured to respond to an externally applied magnetic field, thereby changing their mechanical properties to reduce the deformation of the display panel 100 along the first direction X and the second direction Y, respectively.

[0035] It should be noted that altering its mechanical properties refers to a controllable change in the macroscopic mechanical behavior or intrinsic mechanical parameters of the reinforced structure. This can manifest in ways including, but not limited to, a significant increase or decrease in material stiffness, and changes in the macroscopic shape of the structure (such as bending or stretching). This controllable change in mechanical properties allows the reinforced structure to dynamically adapt to and reduce the stress generated by the deformation of the display panel 100.

[0036] Furthermore, the enhancement structure system of this application exhibits high compatibility and synergy with the aforementioned color arrangement of the sub-pixels 20. The first enhancement structure 31 is positioned between adjacent sub-pixels 20 of different colors within the same row, while the second enhancement structure 32 is positioned between adjacent sub-pixels 20 of the same color within the same column. This arrangement ensures that the enhancement structures, while providing mechanical support, do not interfere with the luminescent characteristics and color layout of the sub-pixels 20 themselves, thus achieving an organic combination of structural enhancement and display performance.

[0037] Understandably, this application integrates the color arrangement rule of sub-pixels 20 with the directional enhancement structure system, thereby achieving a significant improvement in display quality while ensuring mechanical stability. When the flexible display panel 100 deforms, the related technical structure is prone to slight shifts in pixel position or changes in spacing due to uneven internal stress, which may lead to display defects such as color crosstalk or brightness / chromaticity unevenness (Mura).

[0038] See also in this application. Figure 1 and Figure 2As shown, the first enhancement structure 31 is precisely located between adjacent sub-pixels 20 of different colors in the same row, and the second enhancement structure 32 is located between adjacent sub-pixels 20 of the same color in the same column. This arrangement allows the enhancement structures to directly act on the critical areas where color visual sensitivity and mechanical weakness overlap. When the screen is bent, the enhancement structures quickly stiffen under the control of the magnetic field, effectively suppressing the relative displacement and gap changes between adjacent sub-pixels 20 (especially sub-pixels 20 of different colors), thereby ensuring the geometric accuracy and stability of the pixel arrangement. As a result, not only is the overall shape stability of the screen maintained macroscopically, but the independence and uniformity of the light-emitting areas of each color sub-pixel 20 are also guaranteed microscopically. This greatly reduces the risk of optical degradation such as color mixing, edge light leakage, or brightness gradient caused by deformation, achieving a comprehensive performance improvement from mechanical stability to optical fidelity.

[0039] In some embodiments, see Figure 1 As shown, the pixel definition layer 40 has pixel openings for defining the light-emitting areas of the sub-pixel 20 and pixel definition structures 410 located between adjacent openings. A first reinforcement structure 31 is integrated within the pixel definition structure 410 extending along a first direction X, and a second reinforcement structure 32 is integrated within the pixel definition structure 410 extending along a second direction Y. This design integrates the reinforcement structures with the inherent pixel isolation structure of the display panel 100, eliminating the need for additional space, facilitating narrow bezel designs, and ensuring process compatibility.

[0040] In some embodiments, see Figure 1 and Figure 3 As shown, both the first reinforcing structure 31 and the second reinforcing structure 32 include a reinforcing fiber braid. This braid is composed of smart responsive fibers, wherein the fibers extending along the dominant direction of the braid are defined as main fibers. Specifically, in the first reinforcing structure 31, the main fibers of the reinforcing fiber braid extend in a direction parallel to a first direction X; in the second reinforcing structure 32, the main fibers of the reinforcing fiber braid extend in a direction parallel to a second direction Y. These main fibers can be made of magnetorheological fibers.

[0041] It should be noted that the magnetorheological fiber used in this application is a soft magnetic polymer composite fiber prepared based on an engineering model that integrates textile structural mechanics and the magnetic properties of soft magnetic materials. Continuous fibers with a diameter of 57 μm and a magnetic particle content of 70 wt% can be prepared, with lengths reaching the kilometer level, making them suitable for large-scale production.

[0042] Furthermore, the carrier of this magnetorheological fiber is a polymer matrix in which micron-sized soft magnetic particles, such as hydroxyl iron powder, are uniformly dispersed. When a magnetic field of no more than 300 mT (a weak magnetic field strength safe for the human body) is applied, the magnetic particles within the fiber instantaneously (on a millisecond scale) align along the magnetic field lines to form a chain-like structure, resulting in a dramatic change in the fiber's mechanical properties: its yield strength / modulus can increase by more than a hundred times, achieving a rapid switch from a flexible state to a solid-like state; after the magnetic field is removed, the particles disperse, and the mechanical properties immediately recover. The magnetorheological fiber prepared in this way exhibits a high strength of 6.5 N·m·kg⁻¹. -1 It has good bending moment density and good stiffness control capability.

[0043] See Figure 1 As shown, during the fabrication of the display panel 100, the aforementioned magnetorheological fibers are pre-woven into a braided tape structure with a specific orientation using a weaving process. For the first reinforcing structure 31, the axial direction of the main fibers (i.e., the fiber bundles that bear the main load and generate the main response) in the braided tape is arranged along the first direction X (X direction); for the second reinforcing structure 32, it is arranged along the second direction Y. Then, these pre-fabricated fiber braided tapes are embedded into the corresponding grooves formed before the pixel definition layer 40 material (such as a polyimide precursor) is cured using a precision transfer or direct writing process. Subsequently, the pixel definition layer 40 is cured, so that the reinforcing fiber braid is firmly integrated.

[0044] It is understandable that through this directional arrangement, magnetorheological fibers enable the magnetic field to most effectively control the mechanical properties of the fibers and thus suppress deformation in a specific direction.

[0045] In some embodiments, see Figure 3 As shown, when the direction of the applied magnetic field is perpendicular to the axis of the yarn (main fiber), the yarn can rapidly produce significant macroscopic bending deformation and simultaneously stiffen. When the direction of the applied magnetic field is parallel to the axis of the yarn (main fiber), the yarn mainly exhibits strong stiffening ability, while the macroscopic deformation is not obvious. Therefore, by controlling the direction of the magnetic field applied to the display panel 100, the first and second reinforcing structures 32 can be precisely instructed to operate in bending and stiffening or stiffening-only modes, respectively, thereby specifically resisting in-plane deformation of different natures.

[0046] For example, when the magnetic field direction is perpendicular to the axis of the main fiber (e.g., applying a Y-direction magnetic field to a main fiber in the X direction), the magnetic field induces significant lateral bending deformation in the main fiber, while its stiffness increases dramatically. This bending and stiffening mode is suitable for scenarios where it is necessary to follow and lock in bending deformation that has occurred in a specific direction.

[0047] When the magnetic field is parallel to the axis of the main fiber (e.g., applying a magnetic field in the X direction to the main fiber in the X direction), the main fiber will not bend significantly, but its tensile / compressive stiffness will be greatly enhanced. This pure stiffening mode is suitable for scenarios that require direct resistance to axial tensile or compressive deformation.

[0048] Further, see Figure 3 As shown, in order to optimize the structure, control costs, and improve process adaptability while ensuring magnetic response performance, the reinforcing fiber braids in the first reinforcing structure 31 and the second reinforcing structure 32 can adopt a hybrid braiding design. For example, the braid does not necessarily have to be composed entirely of magnetorheological fibers. Instead, it can be designed with magnetorheological fibers as the main fibers, undertaking the core magnetostrictive stiffness function, while being supplemented with ordinary polymer fibers or inert fibers (such as polyester fibers, nylon fibers, etc.) for mixed weaving or interweaving. These ordinary fibers do not have magnetic response characteristics and mainly play the role of maintaining the structural stability of the braid, improving the overall toughness, assisting in stress distribution, and reducing material costs. Through this braiding method that combines functional fibers and structural fibers, while ensuring a significant enhancement of stiffness in the dominant direction (X or Y direction) under the action of a magnetic field, the braid still has good overall flexibility and mechanical integrity when no magnetization is applied, which is more conducive to embedding and fixing in the groove of the pixel definition layer 40.

[0049] To achieve a balance between enhancement effect and maintaining the flexibility of pixel definition structure 410, the volumetric filling density of the reinforcing fiber braid (or main fiber) within pixel definition structure 410 in the first reinforcing structure 31 and the second reinforcing structure 32 can be controlled between 10% and 30%. Too low a density results in insufficient enhancement, while too high a density may affect the flexibility and process reliability of pixel definition layer 40 when undeformed.

[0050] In some embodiments, the first reinforcing structure 31 and the second reinforcing structure 32 can be designed as a multi-layer structure to increase stability. The fiber weaving angle and density of each layer can be the same or different. This allows for adaptation to more complex composite stress states at different times.

[0051] See Figure 1 , Figure 2As shown, to further enhance the structural stability of the display panel 100 in the direction perpendicular to the plane of the substrate 10 (Z direction) and prevent delamination or wrinkling of the screen when bent, the display panel 100 also includes an encapsulation layer and a third reinforcement structure 33 disposed within the encapsulation layer. The encapsulation layer may include a first inorganic encapsulation layer 51, an organic encapsulation layer 52, and a second inorganic encapsulation layer 53 (TFE encapsulation structure) stacked together. The third reinforcement structure 33 is disposed in the central region enclosed by four adjacent sub-pixels 20 (i.e., the cross-shaped center point of the pixel matrix). This third reinforcement structure 33 is also configured to respond to a magnetic field to change its mechanical properties, and its main function is to reduce the deformation of the display panel 100 in the direction perpendicular to the substrate 10 (Z direction), such as resisting out-of-plane warping or compression caused when the panel is bent.

[0052] The third enhancement structure 33 is configured in a more refined manner. First, when forming the pixel definition layer 40, a first groove 411 with a width of not less than 2μm and a depth of not less than 1μm can be pre-formed on the pixel definition structure 410 corresponding to the central region of the four sub-pixels 20 using processes such as photolithography. After the deposition of the cathode and the first inorganic encapsulation layer 51 is completed, a second groove 510 will be formed at the position of the first inorganic encapsulation layer 51 corresponding to the first groove 411 (due to the conformal coverage characteristics of the first inorganic encapsulation layer 51, the size of the second groove 510 is related to the first groove 411).

[0053] See Figure 1 and Figure 3 As shown, the third reinforcement structure 33 specifically includes a reinforcement fiber composite. This composite includes a first fiber layer 331 and a second fiber layer 332 intercalated within the first fiber layer 331. The first fiber layer 331 is composed of densely stacked or woven ordinary fibers, filling and covering the entire bottom surface of the second groove 510, serving to stabilize the substrate and provide initial reinforcement. The magnetorheological fibers (single or multiple bundles) in the second fiber layer 332 extend upwards from the first fiber layer 331 in a direction approximately perpendicular to the substrate 10 (e.g., a pile structure) or at a certain angle (i.e., away from the pixel definition layer 40 / substrate 10), penetrating into the upper organic encapsulation layer 52 region, forming a reinforcement network capable of resisting Z-axis shear. This structure can more effectively transmit and resist Z-axis shear stress. It can be achieved through electrospinning or directional layup techniques, allowing the fibers in the second fiber layer 332 to intercalate and anchor within the first fiber layer 331 at a certain angle, thereby forming a three-dimensional composite structure capable of effectively transmitting and dissipating Z-axis stress.

[0054] Finally, see Figure 1 As shown, an organic encapsulation layer 52 and a second inorganic encapsulation layer 53 are sequentially deposited on the third reinforcing structure 33 to encapsulate and protect the entire third reinforcing structure 33.

[0055] In some embodiments, for the third reinforcement structure 33 disposed within the encapsulation layer, the first fiber layer 331 and the second fiber layer 332 inside it may also employ differentiated material strategies to achieve an optimal configuration of function and cost.

[0056] In an alternative embodiment, the first fiber layer 331 can serve as substrate filler, stress buffer, and anchoring point for the second fiber layer 332, with relatively low requirements for its magnetostrictive stiffness performance. Therefore, the first fiber layer 331 can be composed entirely or partially of ordinary polymer fibers or low-content magnetorheological fibers, reducing costs while meeting basic support functions. The second fiber layer 332, as the core functional layer that directly responds to the magnetic field and generates Z-axis stiffness enhancement and deformation resistance, must be composed of magnetorheological fibers with high response performance to ensure rapid rigidification under the action of a vertical magnetic field, effectively suppressing interlayer shear and warping during panel bending. This composite design of an inert base layer and an active functional layer not only ensures the core performance of the third reinforcing structure 33 but also enhances its integration feasibility and economy in thin-film encapsulation processes.

[0057] In some embodiments, the upper surface of the first fiber layer 331 is located midway between the upper surface of the pixel definition structure 410 and the lower surface of the second inorganic encapsulation layer 53. That is, the height of the third reinforcing structure 33 occupies approximately half of the entire encapsulation layer thickness, with the other half filled and fixed by the encapsulation material, ensuring structural integration and reliability. Since the third reinforcing structure 33 undertakes the task of rigid support and reinforcement in the Z-direction, the total volumetric filling density of its internal reinforcing fibers is higher than that of the first and second reinforcing structures 32, and can be controlled between 30% and 60%.

[0058] It should be noted that the first reinforcing structure 31, the second reinforcing structure 32 and the third reinforcing structure 33 of this application can be prepared and integrated using two highly feasible paths in industrialization, thereby adapting to different supply chains and production processes.

[0059] In an optional embodiment, the reinforcement structure is manufactured as an independent prefabricated functional module by upstream material or component manufacturers. For example, magnetorheological fibers are woven into thin strips in a specific direction, or prefabricated into sheet-like functional layers with specific three-dimensional structures using electrospinning and directional fiber layup techniques. These prefabricated modules possess complete magnetic response functions and structural morphology when delivered to the display panel 100 manufacturing process. During panel manufacturing, the prefabricated modules can be precisely placed in pre-designed positions (such as within the pixel definition layer 40 or in the grooves of the encapsulation layer) through precise transfer, bonding, or embedding processes, and then firmly bonded to the surrounding medium (such as polyimide, encapsulation materials) through curing, lamination, and other processes. This approach facilitates the standardization and large-scale production of the reinforcement structure and allows for quality control and performance optimization independently of the core processes of the display panel 100.

[0060] In another alternative embodiment, the reinforcement structure is constructed directly on the substrate 10 of the display panel 100 through a series of in-situ process steps. For example, firstly, after forming the pixel definition layer 40 or the first inorganic encapsulation layer 51, the required trenches or recesses (such as the first recess 411) are formed at designated locations using techniques such as photolithography, laser etching, or precision printing.

[0061] Subsequently, additive manufacturing technologies such as coating, inkjet printing, direct writing, or electrospinning are used to directly deposit or grow slurries, inks, or fiber precursors containing magnetorheological materials into the aforementioned trenches and designated areas. By controlling process parameters (such as electric field direction, printing path, and material concentration), the directional arrangement of fibers and the construction of specific three-dimensional structures (such as the vertical growth of the second fiber layer 332) can be achieved.

[0062] Finally, through curing, drying, or post-annealing, the material is shaped and forms a stable bond with the surrounding layers, completing the in-situ integration of the reinforcement structure. Directly fabricating the reinforcement structure on the substrate 10 results in high process integration and allows for seamless integration with the display panel 100 process, making it more suitable for applications with intricate structures and extremely high requirements for interface bonding strength.

[0063] In some embodiments, the reinforcement structure is not limited to being disposed within the pixel definition layer 40 or the encapsulation layer, but may also be integrated between specific layers of the flexible substrate 10, or combined with the touch sensor layer (such as a metal mesh or a silver nanowire layer) to achieve multifunctional integration.

[0064] It should be noted that this application may also consider using other smart material fibers that can change their mechanical properties in response to external stimuli (such as electric fields, temperature, and light), such as electrorheological (ER) fibers and shape memory polymer (SMP) fibers. Alternatively, a hybrid braid composed of magnetorheological fibers and other high-performance fibers (such as carbon fibers and aramid fibers) can be used to provide basic high strength while maintaining a smart response.

[0065] Example 2 This second embodiment provides another flexible display panel with adaptive structural enhancement capabilities, which improves color crosstalk and packaging reliability issues during bending by enhancing the optical isolation layer (black matrix) of the display area and the sealing structure of the panel edge.

[0066] See Figure 4 As shown, the display panel also includes a color resist layer 60 (COE structure) located on the encapsulation layer. The color resist layer includes a plurality of color filters 61 and a black matrix 62 spaced apart. The display panel also includes a cover plate 70 and a seal 80 located between the substrate 10 and the edge of the cover plate 70.

[0067] The core improvement of this embodiment is that reinforcement structures that can respond to magnetic fields are integrated inside the black matrix 62 and the sealing element 80, respectively, which are the fourth reinforcement structure 34 and the fifth reinforcement structure 35.

[0068] Among them, see Figure 4 As shown, the fourth reinforcement structure 34 is integrated within the black matrix 62. For example, the fourth reinforcement structure 34 may include magnetorheological fibers uniformly dispersed in the light-shielding material constituting the black matrix 62. The volume fraction of the magnetorheological fibers in the black matrix 62 may be 5% to 10%. The main fiber axis may be set substantially parallel to the plane of the substrate 10 so as to generate primarily in-plane stretching deformation under the action of a magnetic field.

[0069] See Figure 4 As shown, the fifth reinforcing structure 35 is integrated inside the seal 80 and is particularly concentrated at the contact interface between the seal 80 and the substrate 10 and / or the cover plate 70. The fifth reinforcing structure 35 also contains magnetorheological fibers.

[0070] The fifth reinforcing structure 35 may have a laminated structure with an overall height of not less than 2 μm and a width of 60% to 80% of the width of the seal 80 at the contact interface. This structure may include a third fiber layer 351 (support base) and a fourth fiber layer 352 (an active response layer rich in magnetorheological fibers). In the contact interface region, the magnetorheological fibers may account for up to 50% to 70% of the volume. The magnetorheological fibers in the fifth reinforcing structure 35 may have their main fiber axis set substantially perpendicular to the contact interface to effectively generate forces resisting interface separation.

[0071] Brief description of working principle: When the display panel is bent 100 degrees, the matching magnetic field control unit will apply a magnetic field according to the direction of deformation.

[0072] See Figure 6 As shown, for region 62 of the black matrix: a magnetic field acts on the fourth reinforcing structure 34. If the screen is concave and curved, the applied magnetic field is perpendicular to the axis of the magnetorheological fiber, driving it to undergo outward stretching and deformation and increasing its stiffness, thus counteracting the compressive tendency of the black matrix. If it is convex and curved, a magnetic field parallel to the fiber axis is applied, increasing its stiffness and possibly causing it to slightly contract, resisting the stretching tendency.

[0073] See Figure 5 As shown, for the sealing region 80: a magnetic field is applied to the fifth reinforcing structure 35. Depending on whether the interface is subjected to compressive or tensile stress, a magnetic field parallel to or perpendicular to its fiber axis is applied to generate a large stiffness enhancement to lock the interface, or to generate shear deformation and stiffness enhancement to fill micro-voids and provide tensile strength.

[0074] Example 3 This third embodiment provides a display device that, based on the display panel of the first and / or second embodiments, further integrates an intelligent magnetic field control system, realizing real-time perception and adaptive stabilization of deformation.

[0075] See Figure 2 As shown, the display device may include a display panel 100 and a magnetic field control unit 200. The display panel 100 may be the display panel described in Embodiment 1, which has a first reinforcing structure 31, a second reinforcing structure 32, and an optional third reinforcing structure 33 embedded inside. Alternatively, the display panel 100 may also be a flexible display panel having a fourth reinforcing structure 34 and an edge-sealed fifth reinforcing structure 35 in the black matrix 62 described in Embodiment 2.

[0076] The magnetic field control unit 200 is configured to generate magnetic fields with different directions, intensities, and distribution areas. This unit can be disposed on the side, back, or within the bezel of the display panel 100. For example, multiple pairs of electromagnets or permanent magnets (with N and S poles facing each other) can be arranged around the perimeter of the display panel 100. By controlling the energizing state and current magnitude of different magnetic pole pairs, the desired magnetic field vector can be generated in the plane or normal direction of the display panel 100. By controlling the arrangement of the side magnetic poles, magnetic fields parallel to the X-axis, Y-axis, or perpendicular to the screen (Z-axis) can be generated.

[0077] In some embodiments, the display device further includes a sensor unit and a controller, whose coordinated operation is as follows: When the sensor unit detects that the display panel 100 begins to bend, the controller quickly determines the deformation mode and instructs the magnetic field control unit 200 to generate a specific magnetic field combination.

[0078] When the display panel 100 has the structure of Embodiment 1, the controller can perform the following control: for the first reinforcement structure 31 (X direction), it may be necessary to generate a magnetic field parallel to the X-axis (pure stiffening mode) or a magnetic field perpendicular to the X-axis (bending and stiffening mode); for the second reinforcement structure 32 (Y direction), it may generate a magnetic field parallel to the Y-axis to stiffen it; for the third reinforcement structure 33 (Z direction), it may generate a magnetic field perpendicular to the plane of the display panel 100 (Z direction) to stiffen it.

[0079] For example, when the sensor unit detects that the display panel 100 begins to bend, such as detecting positive bending strain along the X direction, the controller quickly determines that the deformation mainly occurs in the first direction X. The controller then sends a command to the magnetic field control unit 200 to control it to generate a specific combination of magnetic fields. For example, for the first reinforcing structure 31 (X direction), it may be necessary to generate a magnetic field parallel to the X-axis (pure stiffening mode, resisting X-direction tension / compression), or to generate a magnetic field perpendicular to the X-axis (bending + stiffening mode, used to follow and lock the already occurred X-direction bending shape). The specific mode can be selected by the controller according to the type of deformation (tension, compression, or bending) to resist. For the second reinforcing structure 32 (Y direction), a magnetic field parallel to the Y-axis may be generated to stiffen it, in order to help stabilize the structure and prevent unnecessary Y-direction twisting when bending in the X direction. For the third reinforcing structure 33 (Z direction), a magnetic field perpendicular to the plane of the display panel 100 (Z direction) may be generated to stiffen it, enhance the shear resistance in the thickness direction of the panel, and suppress the delamination tendency at the bending point.

[0080] When the display panel 100 has the structure described in Embodiment 2, that is, including the fourth reinforcement structure 34 and the fifth reinforcement structure 35, the controller executes the corresponding control logic: for example, when bending inward, a strong magnetic field with a vertical interface is applied to the fifth reinforcement structure 35 on the inner side of the bend to stiffen it, and a vertical magnetic field is applied to the fourth reinforcement structure 34 in the same area to drive it to deform and stiffen in order to counteract compression.

[0081] After the magnetic field is applied, the stiffness of the reinforcing structure inside the panel is instantly increased in a specific direction, effectively reducing the further development of deformation and stabilizing the deformed shape.

[0082] When the sensor detects that the deformation has recovered or ended, the controller can control the magnetic field control unit 200 to shut off or weaken the magnetic field, so that the reinforced structure can regain its flexibility.

[0083] The display device integrates a composite display panel comprising a first reinforcement structure 31, a second reinforcement structure 32, a third reinforcement structure 33, a fourth reinforcement structure 34, and a fifth reinforcement structure 335. This panel combines the technical features of both Embodiment 1 and Embodiment 2, achieving comprehensive mechanical stability from pixels and optical isolation layers to the encapsulation edge.

[0084] For this composite panel, the aforementioned controller can be upgraded with a more complex collaborative control strategy pre-installed. It can simultaneously calculate and output multiple sets of control commands based on the data from the sensing unit to drive all types of enhancement structures within the panel to work collaboratively.

[0085] For example, during an inward bend, the controller can synchronously issue the following coordinated commands to the reinforcement structures in each region based on sensor data: A specific magnetic field is applied to the first reinforcing structure 31 (along the bending axis direction, such as the X direction) to enhance its axial stiffness or drive its deformation, directly resisting compression or stretching in that direction and stabilizing the arrangement of the pixel array in the bending axis direction.

[0086] A magnetic field is applied to the second reinforcement structure 32 (perpendicular to the bending axis direction, such as the Y direction) to stiffen it, thereby suppressing panel distortion or shrinkage in the vertical direction that may be caused by bending and maintaining the geometric stability of the pixels in the vertical direction.

[0087] A magnetic field perpendicular to the panel is applied to the third reinforcing structure 33 (in areas with large bending curvature), which drastically stiffens it, providing strong shear support for the bending hinge area and preventing interlayer slippage or delamination between the functional layer and the encapsulation layer at the point of maximum stress.

[0088] A magnetic field perpendicular to its fiber axis is applied to the fourth reinforcement structure 34 (i.e. the reinforcement structure within the black matrix 62), driving it to generate active expansion deformation, precisely offsetting the compressive strain borne by the black matrix during inward folding, thereby maintaining the optical isolation gap between adjacent color filters and preventing color crosstalk.

[0089] A strong magnetic field perpendicular to the contact interface is applied to the fifth reinforcement structure 35 (i.e., the reinforcement structure within the edge seal 80) to maximize its stiffness and resist the risk of edge peeling caused by bending compressive stress.

[0090] Through this multi-regional, differentiated synchronous magnetic field drive, the controller coordinates the all-round enhancement network from the pixel level (first, second, and third enhancement structures) to the display area optical layer (fourth enhancement structure) and then to the panel edge (fifth enhancement structure), realizing systematic compensation and suppression of complex inward deformation mechanical effects, thereby fundamentally ensuring display integrity, optical quality, and packaging reliability under bending conditions.

[0091] This full-area collaborative control enables display devices to more intelligently and powerfully resist complex deformations and external impacts, achieving a full-link reliability improvement from micro-pixels to macro-packaging.

[0092] In the description of this specification, references to terms such as "some embodiments," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0093] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application. Therefore, any changes or modifications made in accordance with the claims and description of this application should fall within the scope of this patent application.

Claims

1. A display panel, comprising a substrate and a plurality of sub-pixels arranged in an array on the substrate, characterized in that, The display panel also includes: A first enhancement structure is disposed between adjacent sub-pixels arranged along a first direction, and the first enhancement structure is configured to respond to a magnetic field to change its mechanical properties in order to reduce the deformation of the display panel along the first direction. A second enhancement structure is disposed between adjacent sub-pixels arranged along a second direction, and the second enhancement structure is configured to respond to a magnetic field to change its mechanical properties in order to reduce the deformation of the display panel along the second direction. Wherein, the first direction intersects with the second direction.

2. The display panel according to claim 1, characterized in that, The display panel further includes a pixel definition layer, which has a pixel definition structure located between adjacent sub-pixels. The pixel definition structure in the first direction has a first enhancement structure, and the pixel definition structure in the second direction has a second enhancement structure.

3. The display panel according to claim 2, characterized in that, Both the first reinforcing structure and the second reinforcing structure include a reinforcing fiber braid; The reinforcing fiber braid in the first reinforcing structure has a main fiber extending along the first direction, and the deformation mode and stiffness of the main fiber in the first reinforcing structure can be changed according to the change of the magnetic field direction. The reinforcing fiber braid in the second reinforcing structure has main fibers extending along the second direction, and the deformation mode and stiffness of the main fibers in the second reinforcing structure can be changed according to the change of the magnetic field direction.

4. The display panel according to claim 3, characterized in that, When the direction of the magnetic field is perpendicular to the axis of the main fiber, the main fiber undergoes bending deformation and its stiffness increases; When the direction of the magnetic field is parallel to the axis of the main fiber, the stiffness of the main fiber increases.

5. The display panel according to claim 3, characterized in that, The volume fill density of the main fibers in the first and second reinforcing structures is 10% to 30%.

6. The display panel according to claim 2, characterized in that, The display panel further includes an encapsulation layer and a third reinforcement structure disposed within the encapsulation layer. The third reinforcement structure is disposed in the central region surrounded by four adjacent sub-pixels. The third reinforcement structure is configured to respond to a magnetic field to change its mechanical properties in order to reduce the deformation of the display panel in the direction perpendicular to the substrate.

7. The display panel according to claim 6, characterized in that, The pixel definition structure is provided with a first groove; The encapsulation layer includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked together. The first inorganic encapsulation layer has a second groove corresponding to the position of the first groove. A portion of the third reinforcing structure is embedded in the second groove, and another portion extends upward and is located in the organic encapsulation layer. The second inorganic encapsulation layer covers the third reinforcing structure.

8. The display panel according to claim 7, characterized in that, The third reinforcing structure includes a reinforcing fiber composite; The reinforcing fiber composite includes a first fiber layer and a second fiber layer inserted in the first fiber layer; the first fiber layer fills and covers the entire bottom surface of the second groove; the reinforcing fibers in the second fiber layer extend from one side of the first fiber layer in a direction away from the pixel definition layer.

9. The display panel according to claim 8, characterized in that, The upper surface of the first fiber layer is located at the midpoint between the upper surface of the pixel definition structure and the lower surface of the second inorganic encapsulation layer.

10. A display device, characterized in that, include: The magnetic field control unit is configured to generate magnetic fields with different directions; as well as The display panel according to any one of claims 1 to 9, wherein the magnetic field control unit is capable of changing the mechanical properties of the first reinforcement structure and the second reinforcement structure.

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