Support structure and preparation method thereof, display module and display device

Abstract

The application provides a support structure, a preparation method thereof, a display module and a display device. The support structure comprises a support plate, and the support plate comprises a bending area. In the bending area, the support plate is provided with a plurality of through holes, and a filling structure is arranged in the through holes. The filling structure comprises a bottom coating layer and a filling layer arranged in layers. The material of the bottom coating layer comprises a photochromic material. The application achieves the purpose of light shielding and dust prevention by arranging the filling structure in the through holes of the support plate. In addition, the support structure adds the photochromic material to detect the filling effect of the support structure, thereby improving the yield of the support structure.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a support structure and its preparation method, a display module, and a display device. Background Technology

[0002] In recent years, flexible OLED (Organic Light-Emitting Diode) displays have become increasingly recognized and favored by consumers. Flexible displays have significant advantages over traditional displays, such as color saturation and flexibility. Flexible display devices have been commercialized and will evolve towards more complex and advanced forms in the future. Flexible display devices can be realized in various forms, such as bendable, foldable, and rollable displays.

[0003] Currently, flexible display devices generally need to be covered with a film to achieve the purpose of dust prevention and light blocking. After long-term use, the film is prone to deformation and wrinkles. Summary of the Invention

[0004] The purpose of this invention is to provide a support structure and its preparation method, a display module, and a display device to solve the problem that the back-mounted film material is prone to deformation and wrinkling after long-term use in related display technologies.

[0005] To achieve the above objectives, the present invention provides a support structure comprising a support plate, the support plate including a bending region. In the bending region, the support plate has a plurality of through holes, and a filling structure is disposed within each through hole. The filling structure comprises a base layer and a filling layer stacked together, the base layer comprising a photochromic material. The base layer includes a color-changing state indicating the reception of detection light incident from the side of the filling layer away from the base layer, and a non-color-changing state indicating the absence of detection light incident from the side of the filling layer away from the base layer.

[0006] Further, the material of the base coating layer also includes ink. Preferably, the ink includes at least one of polyester ink and acrylic ink. Preferably, the ink is transparent. Preferably, the curing temperature of the ink is 60-100°C. Preferably, the photochromic material includes at least one of spiropyran photochromic materials, diarylethylene photochromic materials, and benzoic acid anhydride photochromic materials. Preferably, the detection light incident from the side of the filler layer away from the base coating layer includes ultraviolet light.

[0007] Further, the filler layer material includes ink. Preferably, the ink includes at least one of polyester ink and acrylic ink. Preferably, the ink color includes black. Preferably, the ink curing temperature is 60-100°C.

[0008] Further, the material of the filling structure includes a solvent, the solvent including a first solvent having a boiling point greater than 150°C. Preferably, before the filling layer cures, the content of the first solvent in the material of the filling layer is less than 5%; and / or, before the base layer cures, the content of the first solvent in the material of the base layer is less than 5%. Preferably, the content of the first solvent in the filling layer is less than 1%; and / or, the content of the first solvent in the base layer is less than 1%; preferably, the first solvent includes at least one of diethylene glycol butyl ether, isophorone, and cyclohexanone.

[0009] Furthermore, the thickness of the base coating is less than 200 nanometers. Preferably, the thickness of the filling structure is less than or equal to the thickness of the support plate.

[0010] Further, the support plate also includes at least one support area connected to the bending area, and the bending area and the support area are arranged along a first direction perpendicular to the thickness direction of the support structure. The through hole is elongated in shape in a cross-section parallel to the first and second directions, and the through hole extends along the second direction. The second direction is perpendicular to the first direction and the thickness direction of the support structure. Preferably, in the bending area, the support structure can bend around a bending axis parallel to the second direction. Preferably, in the support area, the support plate is provided with a plurality of through holes, and the support structure can bend around the bending axis. Preferably, the support plate includes a first surface and a second surface arranged opposite to each other, and when the support area does not bend, the first surface and the second surface are parallel to the first and second directions. Preferably, the plurality of through holes are arranged in an array along the first and second directions, and adjacent through holes in the first direction are staggered. Preferably, the through holes penetrate the support plate along the thickness direction of the support structure.

[0011] Furthermore, the material of the support plate includes at least one of metal and carbon fiber. Preferably, the material of the support plate includes at least one of stainless steel, titanium, aluminum, magnesium, glass, and carbon fiber.

[0012] This invention also provides a method for preparing a support structure, the method comprising: providing a support plate; forming a plurality of through holes in the central region of the support plate to obtain a bending zone in the region where the plurality of through holes are located; sequentially preparing a base coating layer and a filler layer in the through holes to form a filled structure, wherein the material of the base coating layer includes a photochromic material; irradiating the filler layer with detection light on the side of the filler layer opposite to the base coating layer, and judging the filling effect of the filler layer by the color change of the base coating layer; if the base coating layer is in a color-changing state indicating that the detection light has been received, the filling effect of the filler layer is unqualified, and the filler layer material is refilled in the through holes; if the base coating layer is in an uncolored state indicating that the detection light has not been received, the filling effect of the filler layer is qualified.

[0013] Further, both the base coating and the filler layer comprise ink. Preferably, the ink comprises at least one of polyester-based ink and acrylic-based ink. Preferably, the ink in the filler layer is black. Preferably, the ink in the base coating comprises a light-transmitting material. Preferably, the filler structure further comprises a solvent, the solvent comprising a first solvent having a boiling point greater than 150°C. Preferably, the step of sequentially preparing the base coating and the filler layer in the through-hole includes: sequentially preparing the base coating and the filler layer in the through-hole using at least one of a printing process or a coating process. Preferably, the detection light comprises ultraviolet light.

[0014] The present invention also provides a display module, the display module comprising the support structure as described above, or comprising a support structure prepared by the method described above. The display module includes a display panel having a light-emitting surface, the support being disposed on the side of the display panel opposite to the light-emitting surface, and the filler layer in the support structure being located on the side of the base layer near the display panel.

[0015] The present invention also provides a display device, the display device comprising the display module as described above.

[0016] The advantages of this invention are: the support structure, its preparation method, display module, and display device of this invention achieve the purpose of light shielding and dust prevention by setting a filling structure in the through holes of the support plate. Furthermore, this filling structure is not prone to wrinkling or warping during repeated bending and folding, and therefore is not easily detached, effectively extending the service life of the support structure. Simultaneously, the support structure also uses photochromic material to detect its filling effect, enabling timely screening of defective products and rework, thereby improving the yield rate of the support structure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a front view of the support structure in an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the central support structure at line AA';

[0020] Figure 3 This is a schematic flowchart of the support structure preparation method in an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the layered structure of the display module in an embodiment of the present invention.

[0022] The components in the diagram are shown below:

[0023] Support structure 10; Support plate 11;

[0024] Bending area BA; Support area NA;

[0025] First support zone NA1; Second support zone NA2;

[0026] First surface 111; Second surface 112;

[0027] Through hole 12; Filling structure 13;

[0028] Filler layer 131; Base coat 132;

[0029] Display device 1; Display panel 20;

[0030] Array substrate 21; OLED light-emitting layer 22;

[0031] Encapsulation layer 23; Light-emitting surface 24;

[0032] Touch module 30; Polarizing film 40;

[0033] Cover plate 50; Support membrane 60;

[0034] Adhesive layer 70. Detailed Implementation

[0035] The following description, with reference to the accompanying drawings, illustrates preferred embodiments of the present invention, demonstrating its implementability. These embodiments provide a complete overview of the invention for those skilled in the art, making its technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0036] In the accompanying drawings, components with the same structure are indicated by the same numerical designation, and components with similar structures or functions are indicated by similar numerical designations. The dimensions and thicknesses of each component shown in the drawings are arbitrary, and the present invention does not limit the dimensions and thicknesses of each component. To make the illustrations clearer, the thickness of components is appropriately exaggerated in some places in the drawings.

[0037] Furthermore, the following descriptions of the embodiments of the invention are made with reference to the accompanying illustrations, illustrating specific embodiments in which the invention can be implemented. Directional terms used in this invention, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," and "side," are merely directional references to the accompanying drawings. Therefore, the use of directional terms is for better and clearer explanation and understanding of the invention, and does not indicate or imply that the referred device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] When a component is described as being "on" another component, the component may be placed directly on the other component; alternatively, there may be an intermediate component on which the component is placed, and the intermediate component is placed on the other component. When a component is described as being "installed to" or "connected to" another component, both can be understood as being directly "installed" or "connected" to, or as being indirectly "installed to" or "connected to" another component via an intermediate component.

[0039] In related display technologies, the back of the bending area of ​​a flexible display device is usually perforated to reduce the bending stress on the outer film layer during bending, preventing the outer film layer from breaking and thus improving the lifespan of the flexible display device. To prevent dust and impurities from entering the device through this perforation, and also to address the issue of light leakage from the back of the flexible display device, a black film is usually applied to the perforation on the back of the device for light blocking and dust prevention. However, the inventors of this application have discovered that because commonly used film materials have a low modulus and are relatively soft, they are prone to deformation, wrinkles, and edge curling after repeated bending operations, and in severe cases, they may even detach.

[0040] Based on the technical problems discovered in the aforementioned related display technologies, this embodiment of the invention provides a support structure 10, which can be used to provide rigid support for a display panel. For example... Figure 1 As shown, the support structure 10 includes a support plate 11, which includes a bending region BA and support regions NA respectively disposed on both sides of the bending region BA. The support plate 11 has a perforated pattern in the bending region BA to improve its bending performance. In this embodiment, the support structure 10 also includes a filling structure 13 located within the perforated pattern of the support plate 11. This filling structure 13 prevents dust and impurities from contaminating the display panel without increasing the thickness of the support structure 10, and also prevents light leakage through the perforated pattern. Furthermore, the filling structure 13 is less prone to deformation and detachment.

[0041] like Figure 2 As shown, in the thickness direction Z of the support structure 10, the support plate 11 has a first surface 111 and a second surface 112 disposed opposite to the first surface 111. The support plate 11 also includes at least one support region connected to the bending region BA, and the bending region BA and the support region NA are arranged along the first direction X. Specifically, the support plate 11 has two support regions NA, namely a first support region NA1 and a second support region NA2. The bending region BA and the two support regions NA are arranged along the first direction X, which is perpendicular to the thickness direction Z of the support structure 10, that is, the first support region NA1 and the second support region NA2 are respectively connected to the two sides of the bending region BA in the first direction X. When the support structure 10 is in the unfolded state, the first surface 111 in the first support region NA1 and the first surface 111 in the second support region NA2 are in the same plane, and the second surface 112 in the first support region NA1 and the second surface 112 in the second support region NA2 are also in the same plane, that is, the angle between the support plate 11 in the first support region NA1 and the support plate 11 in the second support region NA2 is 180°. When the support structure 10 is in the bent state, at least one side of the bending region BA connected to the support region NA undergoes bending deformation under the application of external force, thereby causing the corresponding support region NA to move closer to the other support region NA, causing the angle between the support plate 11 in the first support region NA1 and the support plate 11 in the second support region NA2 to be less than 180°.

[0042] The display panel can be disposed on the first surface 111 or the second surface 112 of the support plate 11 according to the bending direction requirements. For example, when the display device is an inward-folding type (i.e., the display surface of the display device is located on the inner side of the fold after folding), the display panel can be attached to the first surface 111 of the support plate 11; when the display device is an outward-folding type (i.e., the display surface of the display device is located on the outer side of the fold after folding), the display panel can be attached to the second surface 112 of the support plate 11. In other embodiments of the present invention, the support structure 10 can also be a bidirectional folding type, that is, the support structure 10 can be folded in both the forward and reverse directions to adapt to display devices with different folding directions. Further, in other embodiments of the present invention, bending deformation can also be realized in the support area NA on the support plate 11, that is, hollow patterns (i.e., through holes 12) are provided on both the first surface 111 and / or the second surface 112 of the support plate 11, so that the entire support plate 11 can be bent, thereby enabling the support structure 10 to be applied to rollable display devices.

[0043] The hollow pattern on the support plate 11 consists of multiple through holes 12. These through holes 12 penetrate the support plate 11 in the thickness direction Z of the support structure 10, meaning that the axial direction of the through holes 12 is parallel to the thickness direction Z of the support structure 10. By setting the through holes 12, the rigidity of the support plate 11 in the bending zone BA is reduced, which facilitates the bending of the support structure 10. At the same time, the bending stress generated by the support plate 11 during bending can also be released through the through holes 12, thereby increasing the number of bends of the support plate 11 and extending the service life of the support structure 10.

[0044] Furthermore, through holes 12 can be made in the support plate 11 located in the first support area NA1, so that the support structure 10 located in the first support area NA1 can also bend around the bending axis; while the support plate 11 located in the second support area NA2 cannot bend because it does not have through holes 12 (that is, the first surface 111 and the second surface 112 located in the second support area NA2 are parallel to the first direction X and the second direction Y), thereby achieving the effect of unilateral curling of the bending area BA and the first support area NA1 in combination with the bending area BA. In other embodiments of the present invention, through holes 12 may be formed in the support plate 11 located in the second support region NA2, causing the support structure 10 located in the first support region NA2 to also bend around the bending axis; while the support plate 11 located in the first support region NA1 cannot bend because it does not have through holes 12 (i.e., the first surface 111 and the second surface 112 located in the first support region NA1 are parallel to the first direction X and the second direction Y), thereby achieving the effect of unilateral curling of the bending region BA and the second support region NA2 in combination with the bending region BA. Specifically, the support plate 11 located in the bending region BA bends around a bending axis, which is parallel to the second direction Y, and the second direction Y is perpendicular to the first direction X and the thickness direction Z of the support structure 10. The through-hole 12 has an elongated cross-section parallel to the first direction X and the second direction Y. This elongated cross-section extends along the second direction Y, which is perpendicular to both the first direction X and the thickness direction Z of the support structure 10. In other words, the long side of the through-hole 12 is parallel to the bending axis of the support structure 10. This reduces the excessive concentration of bending stress in the bending zone BA, thus mitigating the risk of localized fracture of the support plate 11 and further improving the service life of the support structure 10. Furthermore, multiple through-holes 12 are arranged in an array along the first direction X and the second direction Y, with adjacent through-holes 12 in the first direction X being staggered.

[0045] The support plate 11 can be made of at least one of metal and carbon fiber. Optionally, the support plate 11 can be made of at least one of stainless steel (SUS), titanium, aluminum, magnesium, glass, and carbon fiber. For example, the support plate 11 can be made of at least one of aluminum alloy plate, magnesium alloy plate, titanium plate, carbon fiber plate, or glass substrate.

[0046] Each through-hole 12 is provided with a filling structure 13 to prevent light emitted from the display panel from leaking out through the through-hole 12, and also to prevent dust and impurities from entering the display panel through the through-hole 12. Specifically, the filling structure 13 includes a base coating layer 132 and a filling layer 131 stacked together. Both the base coating layer 132 and the filling layer 131 contain ink, and the ink in the filling layer 131 is black, which gives the filling structure 13 better light absorption performance, thereby preventing light leakage from the back of the display device. Furthermore, since the Young's modulus of the ink is greater than 100 MPa, its creep recovery performance is better than that of the film material used in related display technologies (generally thermoplastic polyurethane elastomer TPU material), so it will not cause wrinkles, curling edges, or other appearance defects when bending deformation occurs. Preferably, the ink can be at least one of polyester ink and acrylic ink. Polyester ink and acrylic ink have good flexibility, which can improve the deformation capacity and deformation recovery capacity of the filling structure 13, and prevent the filling structure 13 from breaking or falling off during bending. Optionally, the thickness of the filling structure 13 is less than or equal to the thickness of the support plate 11. Preferably, when the support structure 10 is in a flattened state, the two surfaces of the filling structure 13 that are arranged opposite to each other in the thickness direction Z are respectively located in the same plane as the first surface 111 and the second surface 112 of the support plate 11, thereby preventing the filling structure 13 from protruding from the surface of the support plate 11, so as to facilitate the application of the display panel.

[0047] Furthermore, the materials of the base layer 132 and the filler layer 131 also include a solvent, which includes a first solvent. The first solvent is used to dilute the ink material to facilitate uniform filling of the ink material. Optionally, the boiling point of the first solvent is greater than 150°C; before the filler layer 131 and the base layer 132 are cured, the content of the first solvent in the material of the filler layer 131 and the content in the material of the base layer 132 are both less than 5%, and the content of the first solvent in the cured filler layer 131 and the cured base layer 131 are both less than 1%; preferably, in order to avoid excessive first solvent remaining in the ink material after curing, which may lead to problems such as poor adhesion or poor bonding of the filler structure 13, the first solvent with a lower boiling point is selected as much as possible in the material of the filler structure 13. For example, the boiling point of the first solvent selected in the filler structure 13 can be at least one of 160°C, 200°C or 230°C, the content of the first solvent in the filler layer 131 before curing and the base layer 132 before curing can be one of 2%, 3% or 4%, and the content of the first solvent in the cured filler layer 131 and the cured base layer 131 can be 0.07%, 0.1% or 0.2%. Optionally, the high-boiling solvent may be at least one of diethylene glycol butyl ether, isophorone, and cyclohexanone.

[0048] Furthermore, the base layer 132 also includes a photochromic material to detect the filling effect of the filler layer 131. Optionally, the photochromic material can be at least one of spiropyran-based photochromic materials, diarylethylene-based photochromic materials, and fumonisin-based photochromic materials. The base coating 132 has a color-changing state and a non-color-changing state. The color-changing state indicates that detection light is received from the side of the filling layer 131 away from the base coating 132, and the non-color-changing state indicates that no detection light is received from the side of the filling layer 131 away from the base coating 132. That is, the photochromic material in the base coating 132 can change color under the illumination of the detection light. Therefore, after the ink material is filled, the filling effect of the ink material at the edge of the through hole 12 can be checked by irradiation with the detection light. If the color of the base coating 132 does not change after irradiation (it is in the non-color-changing state), it proves that the filling effect of the ink material in the filling layer 131 meets the process requirements. If the color of the base coating 132 changes after irradiation (the base coating 132 is in the color-changing state), it means that the ink material in the filling layer 131 does not completely cover the through hole 12, and therefore cannot completely block light. It can be processed again to improve the filling effect of the filling structure 13. The detection light incident from the side of the filling layer 131 away from the base coating 132 can be ultraviolet light. To prevent the ink material in the base coating 132 from affecting the photochromic material's reception of detection light, the ink in the base coating 132 includes a light-transmitting material. Optionally, the thickness of the base coating 132 is less than 200 nanometers; for example, the thickness of the base coating 132 can be one of 50 nanometers, 100 nanometers, or 150 nanometers.

[0049] This invention also provides a method for preparing a support structure 10, which is used to prepare the support structure 10 as described above. The process of preparing the support structure 10 is as follows: Figure 3 As shown, it includes steps S10-S30.

[0050] Step S10) Provide a support plate 11, and form a plurality of through holes 12 in the central region of the support plate 11 to obtain the bending zone BA in the region where the plurality of through holes 12 are located:

[0051] Prepare a support plate 11, which is a rigid substrate, such as a metal plate, alloy plate, carbon fiber plate or glass plate. In the middle region of the support plate 11, a plurality of through holes 12 are formed by laser process or etching process. The area where the through holes 12 are located is the bending area BA that can undergo bending deformation.

[0052] Step S20) A base coating layer 132 and a filler layer 131 are sequentially prepared in the through-hole 12 to form a filled structure 13:

[0053] A base coating 132 material and a filler layer 131 material are sequentially filled into the through-hole 12 using a filling process, and the base coating 132 material and the filler layer 131 material are cured using a high-temperature process to form a base coating 132 and a filler layer 131. The base coating 132 and the filler layer 131 are combined to form a filled structure 13. Specifically, both the base coating 132 material and the filler layer 131 material include ink and solvent, and the solvent includes a first solvent with a boiling point greater than 150°C. Optionally, the ink can be at least one of polyester ink and acrylic ink, and the ink used in the filler layer 121 can be black ink, while the ink used in the base coating 132 contains a light-transmitting material. Furthermore, the base coating 132 material also includes a photochromic material, which changes color under the illumination of detection light. Optionally, the filling process can be either screen printing or coating. The curing environment of the base layer 132 material and the filler layer 131 material is about 60-100°C, that is, the curing temperature of the ink selected in the base layer 132 and the filler layer 131 is 60-100°C. For example, the ink selected in the base layer 132 and the filler layer 131 can be at least one of the curing temperatures of 70°C, 80°C or 90°C.

[0054] Step S30) Illuminate the filler layer 131 with test light on the side of the filler layer 131 opposite to the base layer 132, and judge the filling effect of the filler layer 131 by observing the color change of the base layer 132:

[0055] The base coating 132 has a color-changing state for indicating the presence of detected light and a non-color-changing state for indicating the absence of detected light. If the base coating 132 remains in a non-color-changing state after illumination, meaning its color does not change, the filling effect of the ink material in the filling layer 131 meets the process requirements, and the support structure 10 is a qualified product. If the base coating 132 changes color after illumination, it indicates that the ink material in the filling layer 131 has not completely covered the through-hole 12 or is unevenly covered, resulting in light-leaking gaps in the filling structure 13 and inability to completely block light. In this case, the support structure 10 is a defective product. The filling effect of the filling structure 13 can be improved by refilling the through-hole 12 with layer 131 material, thus bringing the support structure 10 to the qualified standard. Optionally, the detected light can be ultraviolet light.

[0056] This invention also provides a display module 1, which is a flexible OLED (Organic Light-Emitting Diode) display module 1. Figure 4As shown, the display module 1 includes a support structure and a display panel 20 stacked on one side of the support structure 10. The display panel 20 provides a display light source for the display module 1 and includes an array substrate 21, an OLED light-emitting layer 22, an encapsulation layer 23, etc. The display panel 20 has a light-emitting surface 24 through which the emitted light is emitted. The support structure 10 is located on the side of the display panel 20 opposite to its light-emitting surface 24, and the filling layer 131 in the support structure 10 is located on the side of the base coating layer 132 close to the display panel 20. The flexible display panel 20 of the flexible display module 1 can be bent or unfolded under external force as needed. As the bending radius of the display panel 20 becomes smaller, in order to facilitate bending and unfolding operations and ensure that the performance of the display panel 20 does not degrade during bending and unfolding, the thickness and weight of the display panel 20 have been greatly reduced compared to traditional display panels 20. However, as the display panel 20 becomes thinner and lighter, its physical durability (e.g., mechanical properties, resilience) inevitably decreases, making it very susceptible to damage under external impact, thus reducing the product's reliability and stability. Therefore, to increase the reliability and product stability of the flexible display panel 20, it is typically mounted on the support structure 10, which supports the display panel 20 to improve the overall structural stability of the display module 1.

[0057] To achieve more functions and ensure the overall performance of display module 1, a series of other important components are integrated into display module 1. Specifically, display module 1 may also include a touch module 30, a polarizer 40, a cover plate 50, and a support film 60, which are stacked sequentially on the light-emitting surface 24 of display panel 20. Touch module 30 enables touch control functions, thereby improving the interactive experience between the user and display module 1. Polarizer 40 is used to modulate the light emitted by display panel 20 into polarized light, so that the light has a specific polarization direction during propagation, effectively improving the contrast and color saturation of the displayed image. At the same time, polarizer 40 is also used to prevent ambient light from entering the interior of display panel 20, thereby avoiding interference from ambient light with the display light and ensuring that the display light can be emitted stably, thereby improving the display effect of display module 1 and bringing users an excellent visual experience. Cover plate 50 is used to protect the surface of display module 1, improve the surface abrasion resistance and impact resistance of display module 1, thereby improving the service life of display module 1. The support film 60 is disposed between the display panel 20 and the support structure 10. It is used to protect the flexible substrate film layer (e.g., polyimide film layer) in the display panel 20, provide support for the display panel 20 and prevent the flexible substrate film layer in the display panel 20 from being corroded by moisture.

[0058] Furthermore, the display module 1 may also include multiple adhesive layers 70. These adhesive layers 70 are used to improve the bonding strength between adjacent film layers in the display module 1, preventing problems such as bulging, peeling, and detachment of the film layers in the display module 1. Specifically, such as... Figure 4 As shown, the support structure 10 can be attached to the side of the support mold 60 away from the display panel 20 via an adhesive layer 70. The support film 60 can be attached to the back of the display panel 20 (i.e., the surface opposite to the light-emitting surface 24 of the display panel 20) via an adhesive layer 70. The polarizer 40 can be attached to the side of the touch module 30 away from the display panel 20 via an adhesive layer 70. The cover plate 50 can be attached to the side of the polarizer 40 away from the display panel 20 via an adhesive layer 70. Optionally, the material of the adhesive layer 70 includes at least one of optically clear adhesive (OCA) and pressure-sensitive adhesive (PSA). For example, the adhesive layer 70 between the support structure 10 and the support film 60 and the adhesive layer 70 between the polarizer 40 and the cover plate 50 include optical adhesive, while the adhesive layer 70 between the support film 60 and the display panel 20 and the adhesive layer 70 between the touch module 30 and the polarizer 40 include pressure-sensitive adhesive.

[0059] This invention also provides a display device, which includes a display module 1 as described above. The display module 1 is used to display images on the display device to facilitate operation. The display device can be any display device with display functionality, such as a mobile phone, laptop computer, tablet computer, or vehicle display.

[0060] In this embodiment of the invention, a filling structure is provided in the through holes of the support plate to achieve the purpose of light shielding and dust prevention. Simultaneously, the filling structure provided in this embodiment has a low Young's modulus, making it less prone to wrinkling and warping after repeated bending and folding, thus preventing it from falling off and effectively extending the service life of the support structure. Furthermore, the support structure's filling effect is monitored by adding a photochromic material, allowing for timely screening of defective products and rework, thereby improving the yield rate of the support structure.

[0061] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A support structure, characterized in that, include: Support plate, the support plate including a bending area; In the bending area, the support plate is provided with a plurality of through holes, and a filling structure is provided in the through holes. The filling structure includes a base layer and a filling layer stacked together. The material of the base layer includes a photochromic material. The base coating includes a color-changing state for indicating the reception of detection light incident from the side of the filler layer away from the base coating and a non-color-changing state for indicating the absence of detection light incident from the side of the filler layer away from the base coating.

2. The support structure as described in claim 1, characterized in that, The material of the base coating also includes ink; Preferably, the ink includes at least one of polyester ink and acrylic ink; Preferably, the ink comprises a light-transmitting material; Preferably, the curing temperature of the ink is 60-100℃; Preferably, the photochromic material includes at least one of spiropyran-based photochromic materials, diarylethylene-based photochromic materials, and ursolic anhydride-based photochromic materials; Preferably, the detection light incident from the side of the filler layer away from the base coat layer includes ultraviolet light.

3. The support structure as described in claim 1, characterized in that, The filler layer is made of ink; Preferably, the ink includes at least one of polyester ink and acrylic ink; Preferably, the ink is black; Preferably, the curing temperature of the ink is 60-100℃.

4. The support structure as described in claim 2 or 3, characterized in that, The material of the filling structure includes a solvent, the solvent including a first solvent, the first solvent having a boiling point greater than 150°C; Preferably, before the filler layer cures, the content of the first solvent in the material of the filler layer is less than 5%; and / or, before the base coat layer cures, the content of the first solvent in the material of the base coat layer is less than 5%. Preferably, the content of the first solvent in the filler layer is less than 1%; and / or, the content of the first solvent in the base layer is less than 1%. Preferably, the first solvent includes at least one of diethylene glycol butyl ether, isophorone, and cyclohexanone.

5. The support structure as described in claim 1, characterized in that, The thickness of the base coating is less than 200 nanometers; Preferably, the thickness of the filling structure is less than or equal to the thickness of the support plate.

6. The support structure as described in claim 5, characterized in that, The support plate further includes at least one support area connected to the bending area, and the bending area and the support area are arranged along a first direction perpendicular to the thickness direction of the support structure; The through hole is elongated in shape in a cross section parallel to the first and second directions, and the through hole extends along the second direction; wherein the second direction is perpendicular to the first direction and the thickness direction of the support structure; Preferably, in the bending zone, the support structure can bend about a bending axis, the bending axis being parallel to the second direction; Preferably, in the support area, the support plate is provided with a plurality of through holes, and the support structure can be bent and deformed around the bending axis; Preferably, the support plate includes a first surface and a second surface disposed opposite to each other, and when the support area does not undergo bending deformation, the first surface and the second surface are parallel to the first direction and the second direction, respectively. Preferably, the plurality of through holes are arranged in an array along the first direction and the second direction, and adjacent two through holes in the first direction are staggered; Preferably, the through hole extends through the support plate along the thickness direction of the support structure.

7. The support structure as described in claim 1, characterized in that, The material of the support plate includes at least one of metal and carbon fiber; Preferably, the material of the support plate includes at least one selected from stainless steel, titanium, aluminum, magnesium, glass, and carbon fiber.

8. A method for preparing a support structure, characterized in that, include: A support plate is provided, and multiple through holes are formed in the central region of the support plate to obtain a bending area in the region where the multiple through holes are located; A base coating and a filler layer are sequentially prepared in the through-hole to form a filled structure, wherein the material of the base coating includes a photochromic material; Illuminate the filler layer with detection light on the side of the filler layer away from the base layer, and judge the filling effect of the filler layer by observing the color change of the base layer. If the base coating is in a color-changing state indicating that the detection light has been received, the filling effect of the filling layer is unqualified, and the filling layer material is refilled into the through hole; If the base coating is in a colorless state indicating that it has not received the detection light, then the filling effect of the filling layer is qualified.

9. The method for preparing the support structure as described in claim 8, characterized in that, Both the base coating and the filler layer contain ink. Preferably, the ink includes at least one of polyester ink and acrylic ink; Preferably, the ink in the filler layer is black; Preferably, the ink in the base coating comprises a light-transmitting material; Preferably, the material of the filling structure further includes a solvent, the solvent including a first solvent, the first solvent having a boiling point greater than 150°C; Preferably, the step of sequentially preparing the base coating layer and the filler layer in the through hole includes: sequentially preparing the base coating layer and the filler layer in the through hole by at least one of a printing process or a coating process; Preferably, the detection light includes ultraviolet light.

10. A display module, characterized in that, Includes the support structure as described in any one of claims 1-7; Alternatively, it may include a support structure prepared using the method for preparing a support structure as described in any one of claims 8-9; The display module includes a display panel with a light-emitting surface. The support structure is disposed on the side of the display panel away from the light-emitting surface, and the filling layer in the support structure is located on the side of the base coating layer close to the display panel.

11. A display device, characterized in that, Includes the display module as described in claim 10.

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