Display module and display device

Abstract

The invention discloses a display module and a display device, and belongs to the technical field of display, and the display module comprises a cover plate which is provided with a bending part; at least the area, corresponding to the bending part, of the display panel is flexible; the laminating glue is arranged between the cover plate and the display panel; wherein the bonding glue is at least distributed in at least partial area, corresponding to the bending part, of the display panel, so that the possibility of generating bubbles or wrinkles after the display panel and the glass cover plate are bonded is reduced, and the adverse effects of the bubbles or the wrinkles on the display effect and the manufacturing yield of a finished product are reduced.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display module and display device. Background Technology

[0002] In recent years, as smartphones and other electronic devices have developed towards higher screen-to-body ratios and immersive visual experiences, displays have gradually evolved from traditional flat shapes to curved shapes. Curved screens, due to their advantages in visual continuity and appearance design, have been gradually applied to mid-to-high-end electronic devices.

[0003] In the manufacturing process of curved screens, it is usually necessary to bond the display panel to a glass cover plate with a curved structure. However, in related technologies, bonding defects such as bubbles and wrinkles may still occur after the display panel and the curved glass cover plate are bonded, which will adversely affect the display effect and manufacturing yield of the finished product. Summary of the Invention

[0004] This application provides a display module and display device that can reduce the probability of bubbles or wrinkles appearing after the display panel and glass cover are bonded together, thereby at least partially solving the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a display module is provided, comprising:

[0006] Cover plate, the cover plate having a curved portion; The display panel is flexible, at least in the area corresponding to the curved portion; An adhesive is applied between the cover plate and the display panel; The adhesive is distributed at least in a portion of the display panel corresponding to the curved portion.

[0007] In some embodiments, when the cover plate has a four-curved surface structure, the adhesive is disposed in at least a portion of the area opposite the corners of the display panel and the cover plate.

[0008] In some embodiments, the adhesive is arranged in a fan-shaped ring.

[0009] In some embodiments, the absolute value of the difference between the refractive index of the adhesive and the refractive index of the cover plate does not exceed 0.1.

[0010] In some embodiments, the adhesive is configured to reduce the curvature when the display panel is bonded to the curved portion.

[0011] In some embodiments, the adhesive is configured to cover at least a portion of the display panel opposite the bend before the display panel is bonded to the cover plate.

[0012] In some embodiments, the adhesive is an optically transparent resin.

[0013] In some embodiments, the elastic modulus of the adhesive is 1 GPa to 10 GPa.

[0014] In some embodiments, the linear coefficient of thermal expansion of the adhesive is 8 × 10⁻⁶. -7 / ℃~80×10 -7 / ℃.

[0015] In some embodiments, the refractive index of the adhesive is 1.49 to 1.53.

[0016] In some embodiments, the adhesive has a transmittance of >90%.

[0017] In some embodiments, the adhesive has a dielectric constant of 6.5 to 7.5 at 54 MHz.

[0018] In some embodiments, the viscosity of the adhesive is 1000 cps to 5000 cps.

[0019] In some embodiments, the display module further includes a support body, which is at least partially disposed on the side of the display panel away from the cover plate, connected to the display panel and / or the cover plate, and covers at least a portion of the display panel corresponding to the curved portion.

[0020] In some embodiments, the support covers the entire area of ​​the display panel corresponding to the curved portion.

[0021] In some embodiments, the cover plate has a flat portion connected to the curved portion, and the support also covers at least a portion of the display panel corresponding to the flat portion.

[0022] In some embodiments, the elastic modulus of the support is greater than that of the display panel.

[0023] In some embodiments, when the cover plate has a four-curved surface structure, the support covers the area corresponding to the corner of the display panel and the cover plate.

[0024] In some embodiments, the support body has a uniform thickness on the side of the display panel opposite to the cover plate.

[0025] In some embodiments, the support is an adhesive, a resin-based composite material, or a metal.

[0026] In some embodiments, the support body has a non-uniform thickness on the side of the display panel away from the cover plate, and the thickness of the support body at the center of the curved area of ​​the curved portion is greater than the thickness of the curved area near the edge.

[0027] According to a second aspect of this application, a display device is provided, comprising the display module described in the above technical solution.

[0028] In the display module of this application embodiment, by providing an adhesive between the display panel and the cover plate, and distributing the adhesive at least in at least a portion of the display panel corresponding to the curved portion, the adhesive forms a transition layer structure of a certain thickness in the curved area. This transition layer participates in the construction of the curved shape of the display panel during the bonding process, so that the display panel no longer completely adheres to the original curvature of the cover plate at the curved portion, but forms an adjusted curved shape under the filling and support of the adhesive. This helps to reduce the local curvature when the display panel and cover plate are bonded. Due to the reduced local curvature, the degree of deformation in the curved area of ​​the display panel tends to be milder, thereby reducing the magnitude of the springback tendency in the curved area and reducing the risk of adhesive cohesive failure or interface separation. This reduces the possibility of bubbles or wrinkles forming after the display panel and glass cover plate are bonded, and helps to reduce the adverse effects of bubbles or wrinkles on the finished product's display effect and manufacturing yield.

[0029] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0032] Figure 1 This is a schematic diagram of the structure of the display module provided in an exemplary embodiment of this disclosure; Figure 2 This is a partial structural diagram of the display module provided in an exemplary embodiment of this disclosure; Figure 3 This is a schematic diagram of another partial structure of the display module provided in an exemplary embodiment of this disclosure; Figure 4 This is a schematic diagram of another partial structure of the display module provided in an exemplary embodiment of this disclosure; Figure 5 This is a schematic diagram of another partial structure of the display module provided in an exemplary embodiment of this disclosure; Figure 6This is a schematic diagram of the structure of the cover plate provided in an exemplary embodiment of this disclosure; Figure 7 This is a schematic diagram of the structure of the display panel provided in an exemplary embodiment of this disclosure; Figure 8 This is another structural schematic diagram of the display module provided in an exemplary embodiment of this disclosure; Figure 9 This is another structural schematic diagram of the display module provided in an exemplary embodiment of this disclosure; Figure 10 This is another structural schematic diagram of the display module provided in an exemplary embodiment of this disclosure; Figure 11 This is another structural schematic diagram of the display module provided in an exemplary embodiment of this disclosure; Figure 12 This is a front view of the display module provided in an exemplary embodiment of this disclosure; Figure 13 This is another front view of the display module provided in the exemplary embodiments of this disclosure; Figure 14 This is another front view of the display module provided in the exemplary embodiments of this disclosure.

[0033] Explanation of reference numerals in the attached figures: 100. Display panel; 200. Cover plate; 210. Bending part; 220. Flat part; 230. Corner; 300. Support body; 400. Adhesive. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0035] According to the first aspect of this application, referring to Figures 1 to 14 This disclosure provides a display module, including a cover plate 200, a display panel 100, and an adhesive 400. The cover plate 200 is disposed on the display side of the display module and is used to cover and protect the display panel 100. Exemplarily, the cover plate 200 can be a glass cover plate 200, such as chemically strengthened glass, ultra-thin glass, or other transparent substrate materials suitable for use in display modules.

[0036] In some embodiments, the cover plate 200 has a curved structure, such as a hyperboloid cover plate 200, a tetraboloid cover plate 200, or other cover plate 200 structures with curved edges or corners (see reference). Figure 12 and Figure 14 The curved surface structure mentioned in this article can be understood as an arc-shaped region formed by the cover plate 200 bending in at least one direction. This arc-shaped region can be located at the edge, corner, or a combination of both of the cover plate 200.

[0037] In some embodiments, refer to Figure 1 and Figure 2 The display panel 100 is disposed on the back side of the cover plate 200 and is attached to the cover plate 200. The display panel 100 can be an organic light-emitting display panel 100, a liquid crystal display panel 100, or other types of flexible or semi-flexible display panels 100. Since the display panel 100 usually has a certain degree of rigidity in its structure, when it is attached to the cover plate 200 which has a curved structure, the display panel 100 needs to bend in the corresponding curved area, thereby generating a springback tendency caused by bending in that area.

[0038] In some embodiments, refer to Figure 1 and Figure 2 To suppress the aforementioned rebound tendency, an adhesive 400 is provided in the display module. The adhesive 400 is disposed between the cover plate 200 and the display panel 100, and is distributed at least in at least a portion of the display panel 100 corresponding to the curved portion 210. The adhesive 400 can be an optically transparent resin, and its function is to help reduce the local curvature when the display panel 100 and the cover plate 200 are bonded, thereby reducing the magnitude of the rebound tendency in the curved area of ​​the display panel 100.

[0039] The adhesive 400 can be distributed to cover the entire curved area 210, or it can cover only a portion of the curved area. In the case of the four-curved cover plate 200, the adhesive 400 can be applied to the corner area 230 (Gaussian angle) or extend to the connecting plane area 220 to enhance the bonding stability at the corner 230 and in areas with large curvature changes.

[0040] With the assistance of the adhesive 400, the local stress change at the bonding interface between the display panel 100 and the cover plate 200 is alleviated, which helps to reduce the risk of cohesive failure or interface separation of the adhesive 400, thereby reducing the possibility of bubbles or wrinkles after bonding, and improving the display effect of the finished product and increasing the manufacturing yield.

[0041] In some embodiments, refer to Figure 6 and Figure 7When the cover plate 200 has a four-curved surface structure, the adhesive 400 is disposed in at least a portion of the area opposite the corner 230 of the display panel 100 and the cover plate 200. This corner 230 area is typically a Gaussian angle region formed by the cover plate 200 bending in two or more directions, with a large curvature. When the display panel 100 is bonded to this area, it is prone to springback or local deformation. By disposing the adhesive 400 at a relative position in the corner 230 area, a uniform initial bonding force can be formed between the display panel 100 and the cover plate 200, which helps increase the bonding stability at the corner 230, reduce local stress changes, and thus reduce the risk of cohesive failure or interface separation of the adhesive 400.

[0042] The adhesive 400 can be distributed in a continuous layered structure or a partially distributed block structure in the corner 230 area. Its thickness can be optimized according to the flexibility of the display panel 100 and the curvature of the cover plate 200 to balance support and optical transmittance. This adhesive 400 setting helps reduce the possibility of wrinkles or bubbles forming in the display panel 100 in the corner 230 area, and helps improve the finished product display effect and increase manufacturing yield.

[0043] In some embodiments, refer to Figure 2 and Figure 3 The adhesive 400 is arranged in a fan-shaped ring. The adhesive 400 is distributed along the circumferential or corner area of ​​the curved portion 210 of the cover plate 200, forming a ring-shaped or fan-shaped layout. This facilitates uniform adhesion between the display panel 100 and the cover plate 200, and provides support and cushioning for the curved area. (Refer to...) Figure 4 and Figure 5 The fan-shaped layout can cover the entire curved section 210 or only a part of the curved section 210, and is optimized according to the flexibility of the display panel 100 and the curvature of the cover plate 200.

[0044] The use of the fan-shaped adhesive ring 400 helps reduce the springback of the display panel 100 in curved areas, decreases local stress variations at the bonding interface, thereby reducing the generation of bubbles or wrinkles and improving the finished product's display effect and manufacturing yield. Simultaneously, this layout also ensures good optical performance, maintaining good transmittance and uniformity in the display area.

[0045] In some embodiments, the absolute value of the difference between the refractive index of the adhesive 400 and the refractive index of the cover plate 200 does not exceed 0.1. The refractive index characterizes the degree to which a material affects the speed of light propagation, and its value is related to the light reflection and transmission behavior at the interface. The cover plate 200 is typically formed of glass or transparent ceramic material. The adhesive 400 is located between the display panel 100 and the cover plate 200. As light exits from the display panel 100 and passes through the adhesive 400 into the cover plate 200, it will continuously cross multiple interfaces of different media.

[0046] When the refractive index difference between the adhesive 400 and the cover plate 200 is controlled within 0.1, their optical properties are relatively similar, and the reflection ratio of light at the interface between the adhesive 400 and the cover plate 200 is relatively low. Based on the principles of interface optics, the interface reflectivity is related to the refractive index difference between the two media; the smaller the refractive index difference, the smaller the reflected light component at the interface. Therefore, controlling the refractive index difference within the aforementioned range helps reduce interface reflection light and increases the effective proportion of light emitted to the outside, thereby helping to maintain the brightness consistency and visual uniformity of the display area.

[0047] In quadruple-curved or Gaussian-angle structures, the adhesive 400 is typically distributed in the region corresponding to the bend 210 or corner 230, where curvature changes naturally occur. If a large refractive index difference and curvature change exist simultaneously at the interface, more complex optical path deflection may form locally. When the refractive index difference is confined to a smaller range, even within the curved region, the reflection changes caused by light incident at different angles are relatively gradual, which helps to reduce optical interference in the edge region and makes the optical transition between the curved and planar regions more natural.

[0048] In some embodiments, the refractive index of the adhesive 400 can be further close to that of the cover plate 200. For example, when the cover plate 200 is soda-lime glass or high-alumina glass, its refractive index is typically in the range of 1.48 to 1.55. The refractive index of the adhesive 400 can be adjusted by formulating it to be in the same or adjacent range, so that the refractive indices of the two materials are essentially the same. From the perspective of optical interface matching, when the refractive indices of the two materials tend to be the same, the reflection at the interface theoretically tends to be at a lower level. Therefore, this matching relationship is beneficial for further optimizing the light transmission path.

[0049] For example, the absolute value of the difference between the refractive index of the adhesive 400 and the refractive index of the cover plate 200 may not exceed 0.08, not exceed 0.05, or be controlled within 0.02, in order to adapt to display products with higher optical performance requirements.

[0050] By limiting the refractive index difference between the adhesive 400 and the cover plate 200, the adhesive 400 can perform the function of adjusting the shape of the curved area while taking into account the optical matching relationship. From the perspective of structural configuration, this is conducive to optimizing the shape of the curved area without changing the specifications of the cover plate 200, and maintaining the overall optical performance stability of the display module. This provides a basis for matching material parameters for high-specification quad-curved display modules.

[0051] In some embodiments, the adhesive 400 is configured to reduce the curvature when the display panel 100 is bonded to the curved portion 210. By providing the adhesive 400 between the display panel 100 and the curved portion 210 of the cover plate 200, the radius of the curved area can be increased after the display panel 100 is bonded, thereby relatively reducing the curvature of the display panel 100. This helps to reduce stress concentration in the curved area, reduce the local rebound amplitude of the display panel 100, and thus reduce the possibility of wrinkles or bubbles forming at the bonding interface.

[0052] In some embodiments, refer to Figure 7 The adhesive 400 is configured to cover at least a portion of the display panel 100 opposite the curved portion 210 before the display panel 100 and the cover plate 200 are bonded. By applying the adhesive 400 before bonding, the shape of the curved area of ​​the display panel 100 after bonding can be changed, increasing the radius of the curved area and reducing the curvature, thereby limiting the local rebound amplitude of the display panel 100, which helps to reduce stress concentration at the bonding interface and reduce the probability of bubbles or wrinkles.

[0053] In some embodiments, the adhesive 400 is an optically transparent resin. Optically transparent resin can be understood as a resin-like material that has high light transmittance in the visible light band and possesses adhesive properties both before and after curing. This type of material has a certain degree of fluidity in its uncured or semi-cured state, and can spread between the display panel 100 and the cover plate 200 under external force, forming a stable adhesive layer after curing.

[0054] By using an optically transparent resin as the adhesive 400, the adhesive 400 not only serves to connect the display panel 100 and the cover plate 200 during the bonding process, but also participates in the spatial morphology construction of the bonding area. Especially in the area corresponding to the curved portion 210 of the display panel 100, the optically transparent resin can deform accordingly based on the curved surface of the cover plate 200 during bonding, thereby forming a transitional filling structure between the display panel 100 and the cover plate 200. This structure helps to change the local bending shape of the display panel 100 after bonding, making the curvature of the display panel 100 in the bending area more gradual, and technically helps to reduce stress concentration in this area.

[0055] In some embodiments, the thickness of the adhesive layer 400 formed after the optically transparent resin has cured can be designed according to the curvature of the curved portion 210. The thickness of the adhesive layer 400 can be a substantially uniform structure, or it can exhibit a gradually varying distribution along the bending direction to adapt to the spatial morphology requirements of different curved areas. In this way, the adhesive layer 400 structurally participates in adjusting the bonding relationship of the curved portion 210, which is beneficial to improving the overall stress state of the display panel 100 after bonding.

[0056] In some alternative embodiments, the optically transparent resin may include UV-curable transparent resin, thermosetting transparent resin, dual-curing transparent resin, or other resin materials with similar optical and adhesive properties. These materials can be replaced or combined according to specific bonding process conditions without altering the overall function of the bonding structure, all of which can achieve the bonding connection between the display panel 100 and the cover plate 200, as well as the shape adjustment effect of the curved area.

[0057] In some embodiments, the elastic modulus of the adhesive 400 is 1 GPa to 10 GPa. Exemplarily, the elastic modulus of the adhesive 400 is 1 GPa, 1.4 GPa, 2.1 GPa, 2.8 GPa, 3.3 GPa, 3.9 GPa, 4.5 GPa, 5.2 GPa, 5.7 GPa, 6.1 GPa, 6.6 GPa, 7.0 GPa, 7.4 GPa, 7.8 GPa, 8.1 GPa, 8.4 GPa, 8.6 GPa, 8.8 GPa, 9.0 GPa, 9.2 GPa, 9.3 GPa, 9.4 GPa, 9.5 GPa, 9.6 GPa, 9.7 GPa, 9.8 GPa, 9.85 GPa, 9.9 GPa, 9.95 GPa, or 10 GPa; however, this embodiment does not specifically limit the value of the elastic modulus.

[0058] In some embodiments, the linear coefficient of thermal expansion of the adhesive 400 is 8 × 10⁻⁶. -7 / ℃~80×10 -7 / ℃. For example, the linear coefficient of thermal expansion of adhesive 400 is 8 × 10⁻⁶. -7 / ℃, 10.3×10 -7 / ℃, 14.7×10 -7 / ℃, 18.2×10 -7 / ℃, 21.9×10 -7 / ℃, 25.5×10 -7 / ℃, 29.1×10 -7 / ℃, 32.8×10 -7 / ℃, 36.4×10 -7 / ℃, 39.7×10 -7 / ℃, 42.9×10 -7 / ℃, 46.2×10 -7 / ℃, 49.8×10 -7 / ℃, 53.1×10 -7 / ℃, 55.7×10 -7 / ℃, 58.4×10 -7 / ℃, 61.6×10 -7 / ℃, 64.2×10 -7 / ℃, 66.9×10 -7 / ℃, 69.3×10-7 / ℃, 71.5×10 -7 / ℃, 73.8×10 -7 / ℃, 75.2×10 -7 / ℃, 76.7×10 -7 / ℃, 77.9×10 -7 / ℃, 78.5×10 -7 / ℃, 79.1×10 -7 / ℃, 79.4×10 -7 / ℃, 79.7×10 -7 / ℃ or 80×10 -7 / ℃, the embodiments of this application do not specifically limit this.

[0059] In some embodiments, the refractive index of the adhesive 400 is 1.49 to 1.53. Exemplarily, the refractive index of the adhesive 400 is 1.49, 1.492, 1.495, 1.497, 1.501, 1.503, 1.506, 1.508, 1.510, 1.512, 1.514, 1.516, 1.517, 1.519, 1.520, 1.521, 1.522, 1.523, 1.524, 1.525, 1.526, 1.527, 1.528, 1.5285, 1.529, 1.5292, 1.5295, 1.5297, 1.5299, or 1.53, and this application embodiment does not specifically limit this.

[0060] In some embodiments, the transmittance of the adhesive 400 is >90%. Here, transmittance can be understood as the proportion of incident light transmitted through the adhesive 400 in the visible light band; this parameter characterizes the degree of influence of the adhesive 400 on the display optical path. Setting the transmittance of the adhesive 400 to be greater than 90% helps to reduce the impact of the adhesive 400 on display brightness, color reproduction, and uniformity when the adhesive 400 covers a specific area between the display panel 100 and the cover plate 200.

[0061] Since the adhesive 400 is disposed between the display panel 100 and the cover plate 200, and is distributed at least in the area corresponding to the curved portion 210, the adhesive 400 participates in the light propagation path in this area. When the adhesive 400 has a high transmittance, the adhesive layer formed after bonding has relatively low absorption and scattering of display light, which is structurally beneficial for maintaining the display consistency of the display panel 100 between the curved and non-curved areas.

[0062] In some embodiments, the transmittance of the adhesive 400 can be selected according to the specific optical design of the display module, for example, set to greater than 90%, greater than 92%, greater than 95%, or in the range of 90% to 98%.

[0063] In some embodiments, the dielectric constant of the adhesive 400 at 54 MHz is 6.5 to 7.5. This dielectric constant characterizes the polarization properties of the adhesive 400 under an alternating electric field, and this parameter is related to the electrical compatibility and stability of the adhesive 400 in the display module. Selecting a dielectric constant range at 54 MHz reflects the dielectric response characteristics of the adhesive 400 in the common operating or testing frequency bands of the display module.

[0064] Since the adhesive 400 is disposed between the display panel 100 and the cover plate 200, and is distributed at least in the area corresponding to the bent portion 210, the adhesive 400 is located in the vicinity of the display panel 100, driving circuit, and cover plate 200 after bonding. When the dielectric constant of the adhesive 400 is in the range of 6.5 to 7.5, its electrical properties are well matched with the commonly used display panel 100 substrate, optical adhesive layer, and other structures in the display module, which helps to reduce local electric field concentration or electrical performance fluctuations caused by differences in dielectric properties.

[0065] From a structural fit perspective, the adhesive 400 typically has a certain thickness distribution in the bending area to adjust the shape of the display panel 100 after bonding. When the adhesive 400 meets the shape adjustment requirements while its dielectric constant is controlled within the aforementioned range, it can balance structural support and electrical stability to a certain extent, thereby helping to avoid adverse effects on display driving signals or touch signals due to mismatch in material dielectric properties.

[0066] In some alternative embodiments, the dielectric constant of the adhesive 400 at 54MHz can be set to 6.5, 6.8, 7.0, 7.2 or 7.5, or within sub-ranges such as 6.5 to 7.0 or 6.8 to 7.5.

[0067] In some embodiments, the viscosity of the adhesive 400 is 1000 cps to 5000 cps. For example, the viscosity of the adhesive 400 is 1000 cps, 1127 cps, 1359 cps, 1682 cps, 1945 cps, 2218 cps, 2471 cps, 2736 cps, 2984 cps, 3219 cps, 3457 cps, 3683 cps, 3892 cps, 4075 cps, 4238 cps, 4381 cps, 4509 cps, 4624 cps, 4728 cps, 4815 cps, 4879 cps, 4918 cps, 4943 cps, 4961 cps, 4974 cps, 4982 cps, 4988 cps, 4993 cps, 4997 cps, or 5000 cps. This application embodiment does not specifically limit this.

[0068] In some embodiments, refer to Figure 8 and Figure 9 The display module also includes a support body 300. The support body 300 is at least partially disposed on the side of the display panel 100 opposite to the cover plate 200, and covers at least a portion of the area of ​​the display panel 100 corresponding to the curved surface structure of the cover plate 200. Through the above arrangement, the support body 300 can form support in the curved surface area of ​​the display panel 100, so that the display panel 100 obtains a constraint effect from the back side when it is bent.

[0069] Specifically, since the support 300 is located inside the curvature of the display panel 100, it can provide corresponding support for the springback tendency of the display panel 100 in the curved area, thereby limiting the deformation range of the display panel 100 in the curved area. Based on this, it helps to reduce the local stress changes at the bonding interface between the display panel 100 and the cover plate 200, reducing the risk of cohesive failure or interface separation of the adhesive 400, and thus reducing the possibility of bubbles or wrinkles forming after the display panel 100 and the cover plate 200 are bonded together.

[0070] By providing a support 300 on the side of the display panel 100 facing away from the cover plate 200, it is beneficial to prevent bubbles or wrinkles from occurring after the display panel 100 and the cover plate 200 are bonded together. Since the curved area of ​​the display panel 100 exhibits a springback tendency due to bending when bonded to the curved cover plate 200, the support 300 provides support to this curved area to counteract the springback tendency, thereby limiting the deformation range of the display panel 100 in the curved area. Furthermore, this helps to reduce local stress changes at the bonding interface between the display panel 100 and the cover plate 200, reducing the risk of cohesive failure or interface separation of the adhesive 400, thus reducing the possibility of bubbles or wrinkles occurring after the display panel 100 and the cover plate 200 are bonded together, and also helps to minimize the adverse effects of bubbles or wrinkles on the finished product's display effect and manufacturing yield.

[0071] In some embodiments, refer to Figure 9 and Figure 10 The support 300 may only cover the arc-shaped area corresponding to the curved surface structure of the display panel 100 and the cover plate 200; in other embodiments, the support 300 may extend beyond the arc-shaped area to a portion corresponding to the planar area of ​​the cover plate 200. By adjusting the coverage area of ​​the support 300, it is beneficial to adapt the support effect of the display panel 100 under different curved surface specifications or different module structures.

[0072] Furthermore, the support 300 can be connected to the display panel 100, the cover plate 200, or both. For example, in some embodiments, the support 300 can be fixed to the back of the display panel 100 by adhesive bonding; in other embodiments, when the cover plate 200 is relatively large, a portion of the support 300 can extend to the outside of the display panel 100 and form a connection structure with the cover plate 200. These different connection methods are equivalent in achieving the technical effect of providing support.

[0073] In terms of materials, the support 300 may include optically transparent resin, adhesive, resin-based composite material, or other materials with a certain elastic modulus. In some embodiments, the elastic modulus of the support 300 is greater than that of the display panel 100, thereby providing a more stable support effect in curved areas.

[0074] In some embodiments, refer to Figure 8 and Figure 9 The cover plate 200 has a curved portion 210, which is formed at least partially on the edge or corner of the cover plate 200. The curved portion 210 is used to fit against a corresponding area of ​​the display panel 100 to form a curved display structure.

[0075] In some embodiments, the display panel 100 is flexible at least in the area corresponding to the curved portion 210. This flexible structure allows the display panel 100 to bend in accordance with the curved shape of the curved portion 210 of the cover plate 200 when it is bonded to the curved cover plate 200, thereby reducing stress concentration inside the display panel 100 or at the bonding interface caused by forced bending, which is beneficial to improving the bonding stability of the display panel 100 in the curved area.

[0076] For example, the display panel 100 may include a flexible substrate, such as a polyimide substrate, an ultrathin glass substrate, or other transparent substrate with a certain degree of bending capability. The light-emitting functional layer, electrode layer, and encapsulation layer formed on the flexible substrate are structurally matched to the flexible substrate, enabling the display panel 100 as a whole to deform with the curved surface in the corresponding area of ​​the bending portion 210. With this structural configuration, when the display panel 100 is bonded to the curved cover plate 200, the display panel 100 can gradually conform to the curvature change in the bending area, avoiding warping or springback due to excessive local rigidity.

[0077] Specifically, "flexible" can be understood as the display panel 100 being able to bend along a predetermined direction without irreversible damage under conventional bonding process conditions, and maintaining a shape that is basically consistent with the curved surface of the cover plate 200 after the external force is removed. This flexibility is not limited to being completely free to bend; it can also be a restricted flexibility achieved by reducing the local thickness, setting a stress buffer layer, or adopting a partitioned structure.

[0078] In some embodiments, refer to Figure 8 and Figure 9 The support 300 is at least partially disposed on the side of the display panel 100 away from the cover plate 200, connected to the display panel 100 and / or the cover plate 200, and covers at least a portion of the display panel 100 corresponding to the curved portion 210.

[0079] The support 300 covers at least a portion of the area corresponding to the curved portion 210 of the display panel 100, providing support for the rebound tendency of the display panel 100 in the curved area, thereby limiting the deformation range of the display panel 100 in the curved area. This support helps reduce local stress changes at the bonding interface between the display panel 100 and the cover plate 200, reducing the risk of cohesive failure or interface separation of the adhesive 400, and thus reducing the possibility of bubbles or wrinkles after bonding.

[0080] Specifically, the support 300 can be a continuous layer or a distributed block structure (see reference). Figure 13 and Figure 14 Its thickness and coverage can be adjusted according to the curved shape of the display panel 100. For example, a thicker support 300 is provided at the center of the curved area to provide stronger support, while it gradually thins out to both sides to accommodate the curvature.

[0081] In addition, the support 300 can be connected to the display panel 100 and / or the cover plate 200 by adhesive, mechanical fixation or combination. When the cover plate 200 is large, part of the support 300 can extend to the outside of the display panel 100 and directly contact the cover plate 200 to form a comprehensive support structure for the curved area.

[0082] In some embodiments, refer to Figure 12 and Figure 13The support 300 covers the entire area of ​​the display panel 100 corresponding to the curved portion 210. By completely covering this area, the support 300 can provide uniform support force throughout the entire curved area of ​​the display panel 100, thereby effectively suppressing the springback tendency of the display panel 100 in the curved area and limiting the deformation range of the display panel 100. This helps to reduce local stress changes at the bonding interface between the display panel 100 and the cover plate 200, reducing the risk of cohesive failure or interface separation of the adhesive 400, and thus reducing the possibility of bubbles or wrinkles after bonding.

[0083] In some embodiments, refer to Figure 10 The cover plate 200 has a flat portion 220 connected to the curved portion 210, and the support 300 also covers at least a portion of the display panel 100 corresponding to the flat portion 220. By covering the corresponding area of ​​the flat portion 220, the support 300 not only provides support for the curved portion 210, but also provides additional support for the display panel 100 in the area of ​​the flat portion 220, thereby enhancing the overall bonding stability of the display panel 100. This helps to reduce local stress changes at the bonding interface between the display panel 100 and the cover plate 200, reducing the risk of cohesive failure or interface separation of the adhesive 400, and thus reducing the possibility of bubbles or wrinkles appearing after bonding.

[0084] Specifically, the support 300 can form a continuous layer extending to the planar portion 220, and the coverage and thickness can be adjusted according to the connection structure between the planar portion 220 and the curved portion 210 (see reference). Figure 10 and Figure 11 For example, the thickness is appropriately increased near the bending portion 210 to accommodate the rebound tendency generated by the bending portion 210, while the thickness is gradually reduced towards the edge of the flat portion 220 to adapt to the overall shape of the display panel 100.

[0085] In some embodiments, the elastic modulus of the support 300 is greater than that of the display panel 100. Because the material of the support 300 has a higher elastic modulus, it is less prone to deformation relative to the display panel 100. Therefore, it can generate a supporting force on the curved area of ​​the display panel 100 that is opposite to the direction of the springback tendency, thereby limiting the deformation amplitude of the display panel 100 in the curved area. This supporting effect helps to reduce local stress changes at the bonding interface between the display panel 100 and the cover plate 200, reducing the risk of cohesive failure or interface separation of the adhesive 400, thereby reducing the possibility of bubbles or wrinkles forming after the display panel 100 and the cover plate 200 are bonded, improving bonding quality and the final display effect.

[0086] In some embodiments, refer to Figure 8 and Figure 14When the cover plate 200 has a four-curved surface structure, the support 300 covers the area corresponding to the corner 230 between the display panel 100 and the cover plate 200. By supporting the corner 230 area, the support 300 can effectively limit the rebound tendency of the display panel 100 at the corner 230 where the curvature changes significantly, reduce the local deformation amplitude in this area, thereby reducing the risk of cohesive failure or interface separation of the adhesive 400 at the corner 230, and helping to reduce the possibility of bubbles or wrinkles forming after the display panel 100 and the cover plate 200 are bonded together.

[0087] Specifically, the support 300 can form a distributed block-like or continuous layered structure, covering the entire corner 230 area or part of the corner 230 area. Its thickness and material can be designed according to the curvature at the corner 230, the flexibility of the display panel 100, and the bonding process conditions. For example, a thicker support 300 can be provided at the center of the corner 230 to enhance the support effect, while gradually thinning towards the edge of the corner 230 to adapt to the shape of the display panel 100.

[0088] The corner 230 area is typically formed by the cover plate 200 bending in multiple directions, such as the corner of a four-curved cover plate 200. Geometrically, this can be understood as a Gaussian angle, that is, a region where the curvature is not zero in two mutually perpendicular directions. Due to the large curvature of the corner 230 area, the display panel 100 is prone to springback or local deformation when it is bonded to this area. If there is a lack of support, the adhesive 400 may experience cohesive failure or interface separation, thereby increasing the risk of bubbles or wrinkles.

[0089] In some embodiments, refer to Figure 10 and Figure 11 The support 300 has a uniform thickness on the side of the display panel 100 facing away from the cover plate 200, meaning its thickness remains essentially consistent throughout the covered area. This uniformly thick support 300 provides relatively uniform support force throughout the entire covered area of ​​the display panel 100, thereby helping to limit the springback tendency of the display panel 100 in bending areas, reduce local stress changes at the bonding interface between the display panel 100 and the cover plate 200, and reduce the risk of cohesive failure or interface separation of the adhesive 400, thus reducing the possibility of bubbles or wrinkles after bonding.

[0090] In addition, the equal-thickness support 300 can be combined with the support 300 covering the curved portion 210, the flat portion 220 or the corner 230 area to form a composite support structure, thereby providing overall support for the entire back of the display panel 100, enhancing bonding stability and improving the finished product display effect and manufacturing yield.

[0091] In some embodiments, the support 300 is an adhesive, a resin-based composite material, or a metal. When an adhesive or a resin-based composite material is used, the support 300 can maintain a certain degree of rigidity and elasticity while also ensuring optical transmittance, which is beneficial for providing uniform support to the display panel 100, limiting the springback tendency of the bending area, and reducing the possibility of bubbles or wrinkles after bonding.

[0092] When the support 300 is metal, it can be formed by 3D printing, bonding prefabricated metal parts, or stacking thin metal plates, and then attached to the back of the display panel 100 or connected to the display panel 100 and / or the cover plate 200. The metal support 300 has a high modulus, which is beneficial for providing support to the bending areas of the display panel 100, thereby limiting the tendency to spring back and reducing the risk of local stress changes at the bonding interface and failure of the adhesive 400.

[0093] In practice, the thickness, coverage area and material selection of the support 300 can be optimized according to the curvature of the curved portion 210 of the cover plate 200, the flexibility of the display panel 100 and the bonding process conditions, so as to achieve effective support without affecting the optical performance of the display panel 100.

[0094] In some embodiments, refer to Figure 8 The support 300 has a non-uniform thickness on the side of the display panel 100 away from the cover plate 200. The thickness of the support 300 at the center of the curved area of ​​the curved portion 210 is greater than the thickness near the edge of the curved area. By providing a thicker support 300 at the center of the curved area, stronger support force can be provided, effectively restraining the rebound tendency of the display panel 100 in this area, thereby limiting the local deformation of the display panel 100. The structure that gradually thins towards the edge of the curved area is beneficial for adapting to the extension of the shape of the display panel 100, while avoiding excessive local stress at the edge.

[0095] The thickness distribution of the support 300 can be optimized based on the curvature of the bend 210, the flexibility of the display panel 100, and the bonding process conditions, providing sufficient support without affecting the overall optical performance and bonding quality of the display panel 100. This non-uniform thickness structure helps reduce the risk of cohesive failure or interface separation of the adhesive 400 in the bending area, thereby reducing the possibility of bubbles or wrinkles after bonding and improving the finished product display effect and manufacturing yield.

[0096] According to a second aspect of this disclosure, a display device is provided, including the display module described in the above embodiments. This display device possesses all the beneficial effects of the aforementioned display module, which will not be elaborated further herein.

[0097] In the description of 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0098] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0099] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0100] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A display module, characterized in that, include: Cover plate (200), the cover plate (200) having a bend (210); The display panel (100) is flexible, at least in the area corresponding to the curved portion (210); and Adhesive (400) is disposed between the cover plate (200) and the display panel (100); The adhesive (400) is distributed at least in a portion of the display panel (100) and the curved portion (210).

2. The display module according to claim 1, characterized in that, When the cover plate (200) has a four-curved surface structure, the adhesive (400) is disposed in at least a portion of the area opposite the corner (230) of the display panel (100) and the cover plate (200).

3. The display module according to claim 2, characterized in that, The adhesive (400) is arranged in a fan-shaped ring.

4. The display module according to claim 1, characterized in that, The absolute value of the difference between the refractive index of the adhesive (400) and the refractive index of the cover plate (200) does not exceed 0.

1.

5. The display module according to claim 1, characterized in that, The adhesive (400) is configured to reduce the curvature when the display panel (100) is bonded to the curved portion (210); And / or, the adhesive (400) is configured to cover at least a portion of the display panel (100) opposite the bend (210) before the display panel (100) is bonded to the cover plate (200); And / or, the adhesive (400) is an optically transparent resin; And / or, the elastic modulus of the adhesive (400) is 1 GPa to 10 GPa; And / or, the linear coefficient of thermal expansion of the adhesive (400) is 8 × 10⁻⁶. -7 / ℃~80×10 -7 / ℃; And / or, the refractive index of the adhesive (400) is 1.49~1.53; And / or, the transmittance of the adhesive (400) is >90%; And / or, the dielectric constant of the adhesive (400) is 6.5 to 7.5 under 54MHz conditions; And / or, the viscosity of the adhesive (400) is 1000cps to 5000cps.

6. The display module according to any one of claims 1 to 5, characterized in that, The display module further includes a support (300), which is at least partially disposed on the side of the display panel (100) away from the cover plate (200), connected to the display panel (100) and / or the cover plate (200), and covers at least a portion of the display panel (100) corresponding to the curved portion (210).

7. The display module according to claim 6, characterized in that, The support (300) covers the entire area of ​​the display panel (100) corresponding to the curved portion (210); And / or, the cover plate (200) has a flat portion (220) connected to the curved portion (210), and the support (300) also covers at least a portion of the display panel (100) corresponding to the flat portion (220); And / or, the elastic modulus of the support (300) is greater than that of the display panel (100); And / or, when the cover plate (200) is a four-curved surface structure, the support (300) covers the area corresponding to the corner (230) of the display panel (100) and the cover plate (200).

8. The display module according to claim 6, characterized in that, The support (300) has a uniform thickness on the side of the display panel (100) away from the cover plate (200); And / or, the support (300) is an adhesive, resin-based composite material or metal.

9. The display module according to claim 6, characterized in that, The support (300) has a non-uniform thickness on the side of the display panel (100) away from the cover plate (200), and the thickness of the support (300) at the center of the curved area of ​​the curved portion (210) is greater than the thickness of the curved area near the edge.

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

Images