Display module, display device and electronic product

Abstract

The application belongs to the technical field of electronic display products, and discloses a display module, a display device and an electronic product. The display module comprises a cover plate and a flexible screen body, the flexible screen body comprises a first extension part, a second extension part and a bending part, and a heightening layer is arranged between the first extension part and the second extension part. When the cover plate and the flexible screen body are bent, a planar area and a curved surface area are formed between the cover plate and the flexible screen body. In the planar area, the cover plate and an optical adhesive layer have a first total thickness a0, and in the curved surface area, the cover plate and the optical adhesive layer have a second total thickness a1, a1 is greater than a0. In the direction from the planar area to the bending part, the thickness of the heightening layer first decreases and then increases. The application solves the problem of edge collapse of the flexible screen body, increases the minimum distance from the edge of the flexible screen body to the edge of the cover plate, and the heightening layer can well support the flexible screen body to ensure the bending shape of the flexible screen body, thereby easily obtaining an extremely narrow frame.

Description

Technical Field

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

[0002] In the production process of hyperbolic or quad-curved electronic products, the bonding of the CG (glass cover) in the display module requires the use of a contoured PAD (template) in a vacuum environment. The contoured PAD and the CG are pressed against each other, and the panel (flexible screen) is adhered to the CG using OCA (optical adhesive), forming a hyperbolic or quad-curved display module. With the iterative updates of quad-curved mobile phones, the bezel width of the display module obtained in this way cannot meet the requirements, especially the bottom bezel, which does not meet the demand for ultra-narrow bezels. Summary of the Invention

[0003] The purpose of this invention is to provide a display module, display device, and electronic product to solve the problem that the reduced curvature of flexible screens in the curved area affects the bezel size of the display device in electronic products.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A display module includes a cover plate and a flexible screen body, wherein the cover plate and the flexible screen body are bonded together by an optical adhesive layer; the flexible screen body includes a first extension, a second extension and a curved portion connecting the first extension and the second extension, and a padding layer is provided between the first extension and the second extension.

[0006] The cover plate and the flexible screen body are bent along the thickness direction of the flexible screen body at one end facing the bending portion, forming a planar region and an arcuate region between the cover plate and the flexible screen body. In the planar region, the cover plate and the optical adhesive layer have a first total thickness a0, and in the arcuate region, the cover plate and the optical adhesive layer have a second total thickness a1. The second total thickness a1 is not less than the first total thickness a0. From the planar region to the bending portion, the thickness of the padding layer first decreases and then increases.

[0007] In some embodiments, the difference between the second total thickness a1 and the first total thickness a0 is less than or equal to 0.05 mm.

[0008] In some embodiments, in the planar region, the optical adhesive layer has a first thickness A0, and in the arcuate region, the optical adhesive layer has a second thickness A1, wherein the second thickness A1 is greater than the first thickness A0.

[0009] In some embodiments, in the arcuate region, the cover plate has a convex arcuate surface facing the optical adhesive layer on the side facing the optical adhesive layer, and the protrusion height of the convex arcuate surface is B = a1 - a0.

[0010] In some embodiments, in the arcuate region, the optical adhesive layer has a first increased thickness B1, and the cover plate has a second increased thickness B2, where B1+B2=a0-a1.

[0011] In some embodiments, the padding layer has a third thickness C0 in the section corresponding to the planar region, and the padding layer has a fourth thickness C1 in the section corresponding to the arcuate region, wherein the fourth thickness C1 is less than the third thickness C0.

[0012] In some embodiments, the fourth thickness C1 is greater than 90% of the third thickness C0.

[0013] In some embodiments, the section of the padding layer connecting the bend has a fifth thickness C2, which is greater than the third thickness C0.

[0014] In some embodiments, the fifth thickness C2 is less than 110% of the third thickness C0.

[0015] In some embodiments, the bending portion has a bending radius R1, the third thickness C0 is equal to the diameter 2R1 of the bending portion, and the maximum distance between the bending portion and the end face of the padding layer is R1.

[0016] In some embodiments, the padding layer has a section of the fourth thickness C1, and the side of the padding layer facing the cover plate has a concave arc surface.

[0017] In some embodiments, the difference between the second thickness A1 and the first thickness A0 is less than or equal to 0.05 mm.

[0018] In some embodiments, the cover plate and the flexible screen body are bent along the thickness direction of the flexible screen body at one end facing the bending portion to form a bent portion, the bent portion having a first arc length L1, the arc surface region having a second arc length L2, and the second arc length L2 being no greater than one-third of the first arc length L1.

[0019] A display device includes the display module provided by the present invention.

[0020] An electronic product includes the display device provided by the present invention.

[0021] The beneficial effects of this invention are:

[0022] The display module provided by this invention, based on the characteristics of the cover plate and flexible screen forming planar and curved areas after bending, provides a cover plate and / or optical adhesive layer with increased thickness in the curved area. This can compensate for insufficient flow caused by the accumulation of the optical adhesive layer in the curved area after heating, improve the edge sagging problem of the flexible screen, avoid the problem of reduced curvature of the flexible screen during secondary bending, increase the minimum distance from the outer edge of the flexible screen to the edge of the cover plate, and facilitate the achievement of extremely narrow bezels. By setting the support pads inside the flexible screen as a structure of unequal thickness, with the thickness of the pads decreasing first and then increasing in the direction from the planar area to the curved part, the pads can effectively support the flexible screen during the overall secondary bending and bonding of the cover plate and the flexible screen to ensure the bending shape of the flexible screen and avoid interference with the mid-frame caused by changes in the shape of the flexible screen. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structural changes of a display module after a secondary bending in the prior art;

[0024] Figure 2 This is a schematic diagram of the structure of the electronic product provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the display module provided in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the optical adhesive layer thickness variation in the display module provided in Embodiment 1 of the present invention;

[0027] Figure 5 This is a comparative schematic diagram of the display module provided in Embodiment 1 of the present invention and the display module of the prior art after the flexible screen body is bent twice;

[0028] Figure 6 This is a schematic diagram of the unequal thickness structure of the padding layer in the display module provided in Embodiment 1 of the present invention;

[0029] Figure 7 This is a schematic diagram comparing the thickness of the padding layer in the display module before and after the change provided in Embodiment 1 of the present invention;

[0030] Figure 8 yes Figure 7 Enlarged structural diagram of region A in the middle;

[0031] Figure 9 This is a schematic diagram showing the positional relationship between the arc-shaped area and the bent portion in the display module provided in Embodiment 1 of the present invention;

[0032] Figure 10 This is a schematic diagram of the structure of the display module provided in Embodiment 2 of the present invention;

[0033] Figure 11This is a schematic diagram of the display module provided in Embodiment 3 of the present invention.

[0034] In the picture:

[0035] 100. Electronic products; 200. Display devices; 300. Display modules;

[0036] 1. Cover plate; 2. Flexible screen body; 21. First extension; 22. Second extension; 23. Bending part; 24. Padding layer; 3. Optical adhesive layer. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0038] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0041] To address the need for extremely narrow bottom bezels in existing dual-curved or quad-curved electronic products 100, embodiments of the present invention provide a display module 300, a display device 200, and an electronic product 100, such as... Figure 2 The diagram shows the structure of an electronic product 100, which can be a mobile phone, tablet, computer, or other product with at least one display device. Figure 2 The electronic product 100 shown uses an optical adhesive layer 3 of uniform thickness to bond the cover plate 1 and the flexible screen 2 on both sides of its display device 200, resulting in a narrow bezel structure. However, applying the same structure to the bottom or lower bezel leads to an increase in bezel width. With the iterative upgrades of existing quad-curved mobile phones, end-users are demanding deeper design features at the four corners of the display device 200, i.e., moving towards a deeper quad-curved design. Therefore, it is urgent to improve the structure of the display module 300 at the bottom or lower bezel to meet the design requirements for a narrow bezel.

[0042] like Figure 3 As shown, this embodiment of the invention provides a display module 300, including a cover plate 1 and a flexible screen 2, which are bonded together by an optical adhesive layer 3. After the flexible screen 2 is bent once, it forms a first extension 21, a second extension 22, and a curved portion 23 connecting the first extension 21 and the second extension 22. A padding layer 24 is provided between the first extension 21 and the second extension 22. The end of the cover plate 1 and the flexible screen 2 facing the curved portion 23 is bent twice along the thickness direction of the flexible screen 2, forming a planar area and an arc-shaped area between the cover plate 1 and the flexible screen 2. The cover plate 1 and the optical adhesive layer 3 have a first total thickness a0 in the planar area and a second total thickness a1 in the arc-shaped area. The second total thickness a1 is greater than the first total thickness a0. The thickness of the padding layer 24 decreases and then increases from the planar area to the curved portion 23.

[0043] It should be explained that the cover plate 1 mentioned in this embodiment is generally a glass cover plate, abbreviated as CG. The optical adhesive layer 3 is used to bond and connect the cover plate 1 and the flexible screen 2 (also called a panel). The optical adhesive layer 3 is also called the OCA layer. The cover plate 1 is curved and bonded to the flexible screen 2 under heating conditions. The flexible screen 2 itself undergoes a single bending to form a first extension 21, a second extension 22, and a bent portion 23. The planes containing the first extension 21 and the second extension 22 are parallel to the plane containing the cover plate 1. The first extension 21, the second extension 22, and the bent portion 23 are located in the lower frame area of ​​the flexible screen 2. To achieve the curved surface setting of the lower frame area, the flexible screen 2 and the cover plate 1 undergo a secondary bending to form a bent portion, which includes an R-angle portion. When the cover plate 1 and the flexible screen 2 are heated and bonded, the conformal pressing component first contacts the planar area of ​​the cover plate 1. The R-angle formed during the secondary bending is bonded through the deformation of the conformal pressing component. Ideally, as... Figure 1 As shown by the solid line, the cover plate 1, the first extension 21, and the second extension 22 at the bending section all bend during bonding. The minimum distance between the edge of the flexible screen 2 and the edge of the cover plate 1 is d01 to ensure the bonding between the display module and the mid-frame. Because the optical adhesive layer 3 becomes more fluid after heating, it accumulates within the radius (R-angle) as the cover plate 1 and the flexible screen 2 undergo secondary bending deformation. This accumulation area is called the curved surface area. The local accumulation of optical adhesive reduces the curvature of the flexible screen 2 during secondary bending, resulting in insufficient deformation. The minimum distance between the edge of the flexible screen 2 (also called the chin bending point) and the edge of the cover plate 1 decreases to d02. Since d01 > d02, the edge of the flexible screen 2 easily interferes with the mid-frame during installation, failing to meet the development requirements of ultra-narrow bezels in electronic products.

[0044] To address the aforementioned technical problems, this invention provides a cover plate 1 and / or optical adhesive layer 3 with increased thickness in the curved area. This compensates for the accumulation of the optical adhesive layer 3 in the curved area after heating. The thickened cover plate 1 and / or optical adhesive layer 3 solves the problem of reduced curvature of the flexible screen 2, increases the minimum distance from the outer edge of the flexible screen 2 (the starting point of the bending portion 23) to the edge of the cover plate 1, avoids interference between the flexible screen 2 and the mid-frame, and thus facilitates the achievement of an extremely narrow bezel. By using the padding layer 24 (… Figure 3 The shaded area is set as a structure of unequal thickness. The thickness of the padding layer 24 decreases and then increases in the direction from the planar area to the curved part 23, and has the minimum thickness in the curved area. Thus, by setting the height of the padding block, the end of the flexible screen 2 where the curved part 23 is located can be supported, preventing the flexible screen 2 from collapsing in the R-angle shape during the second bending. After the flexible screen 2 is bent twice as a whole, the padding layer 24 can ensure the second bending shape of the flexible screen 2, avoid the shape change of the flexible screen 2 causing interference with the middle frame, and thus make it easy to achieve an extremely narrow bezel.

[0045] like Figure 1 As shown, the curved area refers to the region where optical adhesive accumulates during the heat bonding process. Due to inconsistent bending errors that may occur between the cover plate 1 and the flexible screen 2 during the secondary bending bonding, the optical adhesive accumulates in certain areas during the flow process, especially in areas with large bends, such as the maximum bend at the radius of curvature (R-angle). This curved area can be measured based on experimental results. During the heat bonding of the curved surfaces of the cover plate 1 and the flexible screen 2, as shown... Figure 2 and Figure 3 The planar region is located in the XY plane. The cover plate 1 and the flexible screen 2 undergo a secondary bending downwards in the negative Z direction. That is, one end of the flexible screen 2 along the Y direction undergoes a secondary bending downwards under the action of the conformal pressing component and the cover plate 1. During the secondary bending, a bending portion (including the area where the R-angle is located) is formed between the end of the flexible screen 2 and the end of the planar region. There is an arc-shaped region within the bending portion. In this embodiment, by setting the cover plate 1 and the optical adhesive layer 3 in the arc-shaped region to have a second total thickness a1 that is greater than the first total thickness a0, the problem of reduced curvature of the flexible screen 2 caused by the accumulation of optical adhesive can be effectively avoided. The second total thickness a1 of the cover plate 1 and the optical adhesive layer 3 includes the thickness of the cover plate 1 and the thickness of the optical adhesive layer 3. The second total thickness a1 of the cover plate 1 and the optical adhesive layer 3 is greater than the first total thickness a0. It can be that the thickness of the cover plate 1 remains unchanged and only the thickness of the optical adhesive layer 3 is increased, or the thickness of the optical adhesive layer 3 remains unchanged and only the inner surface of the cover plate 1 is thickened, or the inner surface of the cover plate 1 is thickened and the optical adhesive layer 3 is thickened. The three methods will be described in detail below through specific embodiments.

[0046] Example 1: A display module 300, in the curved area, the thickness of the cover plate 1 remains unchanged, and the thickness of the optical adhesive layer 3 is increased to a first thickness A1.

[0047] like Figure 4 As shown, Embodiment 1 of the present invention provides a display module 300, including a cover plate 1 and a flexible screen 2, which are bonded together by an optical adhesive layer 3. The flexible screen 2 includes a first extension 21, a second extension 22, and a curved portion 23 connecting the first extension 21 and the second extension 22. A padding layer 24 is provided between the first extension 21 and the second extension 22. The end of the cover plate 1 and the flexible screen 2 facing the curved portion 23 is bent twice along the thickness direction of the flexible screen 2, forming a planar area and an arcuate area between the cover plate 1 and the flexible screen 2. The optical adhesive layer 3 has a first thickness A0 in the planar area and a second thickness A1 in the arcuate area. The second thickness A1 is greater than the first thickness A0. The thickness of the padding layer 24 decreases and then increases in the direction from the planar area to the curved portion 23.

[0048] The display module 300 provided by this invention solves the aforementioned problem of ultra-narrow bezel design. Based on the characteristics of the planar and curved areas formed after the cover plate 1 and flexible screen 2 are bent twice, an optical adhesive layer 3 with increased thickness is provided in the curved area. This compensates for insufficient flow caused by the accumulation of the optical adhesive layer 3 in the curved area after heating. The thickened optical adhesive layer 3 solves the problem of reduced curvature of the flexible screen 2, increases the minimum distance from the edge of the flexible screen 2 to the edge of the cover plate 1, avoids interference between the flexible screen 2 and the mid-frame, and thus facilitates the achievement of an ultra-narrow bezel. Figure 5 As shown, the dashed line represents the secondary bending shape of the conventional flexible screen 2, while the solid line represents the secondary bending shape of the flexible screen 2 in this embodiment of the invention. When the optical adhesive layer 3 of uniform thickness is used to bond the cover plate 1 and the flexible screen 2, the curvature of the secondary bending of the flexible screen 2 decreases due to the accumulation of the optical adhesive layer 3 in the curved area. The minimum distance between the outer edge of the flexible screen 2 and the outer edge of the cover plate 1 is d1, and the size of the lower frame is e1. In this embodiment of the invention, by increasing the thickness of the optical adhesive layer 3 in the curved area, the curvature of the flexible screen 2 during secondary bending increases, and the minimum distance between the outer edge of the flexible screen 2 and the cover plate 1 increases to d2, achieving an ideal bending state. This results in a lower frame with a size of e2, where e2 < e1, effectively avoiding interference between the flexible screen 2 and the middle frame, and making it easier to obtain an extremely narrow lower frame.

[0049] Because the flow of the optical adhesive layer 3 after heating is affected by the bending difference of the inner pad 24 of the cover plate 1 and the flexible screen 2, the second thickness A1 of the optical adhesive layer 3 in the arc region has a non-uniform thickness characteristic along the Y direction. That is, along the Y direction, the value of the second thickness A1 changes uniformly and continuously to adapt to the curved shape of the arc region so as to ensure good adhesion between the cover plate 1 and the flexible screen 2.

[0050] In some embodiments, the padding layer 24 has a third thickness C0 in the section corresponding to the planar region and a fourth thickness C1 in the section corresponding to the curved region, wherein the fourth thickness C1 is less than the third thickness C0.

[0051] like Figure 6 As shown, in the section corresponding to the planar area, the padding layer 24 has a uniform thickness, namely the third thickness C0; in the section corresponding to the curved area, the thickness of the padding layer 24 is appropriately reduced to the fourth thickness C1, which can reduce the bending stress during the secondary bending of the flexible screen 2. The section with the fourth thickness C1 and the section with the third thickness C0 have a smooth transition, which can reduce the stress unevenness caused by the protrusion design.

[0052] In some embodiments, the fourth thickness C1 is greater than 90% of the third thickness C0.

[0053] It is understandable that the section containing the fourth thickness C1 is directly opposite the curved area between the cover plate 1 and the flexible screen 2. Therefore, the reduction in the fourth thickness C1 compared to the third thickness C0 will not affect the supporting effect of the end of the padding layer 24 on the bent part 23. The conventional padding layer 24 structure uses padding blocks with uniform thickness, resulting in a uniform thickness padding layer 24. When the flexible screen 2 undergoes a secondary bending, the uniform thickness padding layer 24 experiences greater bending stress in the curved area, which can easily lead to inconsistent curvature between the cover plate 1 and the flexible screen 2 during the secondary bending. This results in a smaller curvature of the flexible screen 2 during the secondary bending, causing interference between the flexible screen 2 and the mid-frame. This embodiment of the invention thins a local section of the padding layer 24, making it easier for the flexible screen 2 to conform and deform during the secondary bending, meeting the curvature requirements, thereby obtaining a display module 300 that meets the requirements and facilitating the design of electronic products 100 with extremely narrow bezels.

[0054] Specifically, the fourth thickness C1 cannot be too small, otherwise it will affect the support effect of the padding layer 24 on the flexible screen 2, causing peeling. In a preferred embodiment, the thickness difference (C0-C1) between the minimum values ​​of the third thickness C0 and the fourth thickness C1 is no greater than 10% of the third thickness C0. It can be understood that the fourth thickness C1 is along the length direction of the padding layer 24 (i.e.,...). Figure 6 The value of the fourth thickness (in the Y direction) varies uniformly and has a smooth surface transition with the thickness of the two end regions to reduce stress unevenness caused by the protrusion design. The minimum value of the fourth thickness C1 is located at the maximum curvature of the arc region, which corresponds to the position of the maximum value of the second thickness A1. From the maximum curvature along both sides of the Y direction, the fourth thickness C1 gradually increases, which is reflected in the gradual change of the overall thickness of the pad layer 24. That is, from the plane region to the curved part 23, the thickness of the pad layer 24 first decreases and then increases.

[0055] In some embodiments, the section of the pad height 24 connected to the bend 23 has a fifth thickness C2, which is greater than the third thickness C0.

[0056] For example Figure 6After the flexible screen 2 undergoes a single bend, it forms a double-layer structure consisting of a first extension 21 and a second extension 22. Ideally, the bent portion 23 connecting the first extension 21 and the second extension 22 is a semi-circular structure. Under bending stress, the padding layer 24 may separate from the flexible screen 2 at both ends of the bent portion 23, affecting the support effect of the padding layer 24. To solve this problem, in this embodiment of the invention, the thickness of the padding layer 24 at both ends of the bent portion 23 is increased to a fifth thickness C2, that is, the fifth thickness C2 is increased relative to the third thickness C0. The increased thickness of the padding layer 24 can better support the flexible screen 2, prevent the flexible screen 2 from deforming and collapsing after a second bend, ensure the bending deformation shape of the flexible screen 2 during the second bend, and avoid large deformation of the bent portion 23 under bending stress. This helps to ensure that the curvature and shape of the flexible screen 2 meet the design requirements. It is understood that the end of the padding layer 24 has a fifth thickness C2, which makes the bending part 23 change from a semi-circular structure to a semi-elliptical structure. The bending part 23 can fit well with the padding layer 24 during the first and second bending processes. The support of the padding layer 24 for the bending part 23 avoids the problem of end collapse of the flexible screen 2 during the second bending, thereby ensuring that the flexible screen 2 has the curvature that meets the design requirements.

[0057] In some embodiments, the fifth thickness C2 is less than 110% of the third thickness C0.

[0058] like Figure 6 The section containing the fifth thickness C2 is used to support the two ends of the curved part 23, solving the problem of the two ends of the curved part 23 separating from the padding layer 24 due to bending stress. Therefore, the thickness is appropriately increased to the fifth thickness C2 based on the third thickness C0. If the value of the fifth thickness is too large, it will affect the bonding and support effect of the section containing the fourth thickness C1. Therefore, it is necessary to comprehensively consider the thickness of different sections of the padding layer 24. In this embodiment, the increase value of the fifth thickness C2 does not exceed 10% of the third thickness C0, that is, the fifth thickness C2 is less than 110% of the third thickness C0 and greater than the third thickness C0. Within this range, the fifth thickness C2 is beneficial to improve the edge collapse of the flexible screen 2, avoid the problem of the minimum distance between the outer edge of the flexible screen 2 and the edge of the cover plate 1 being reduced due to the shape deformation of the curved part 23 during the secondary bending process, and thus avoid interference with the middle frame, achieving an extremely narrow bottom bezel. In the section where the fifth thickness C2 is located, the padding layer 24 can have a uniform thickness cross section along the Y direction. This section is located between the end of the curved portion 23 and the end of the optical adhesive layer 3. The section with the fifth thickness C2 and the section with the fourth thickness C1 are smoothly connected.

[0059] In some embodiments, the bending portion 23 has a bending radius R1, the third thickness C0 is equal to the diameter 2R1 of the bending portion 23, and the maximum distance between the bending portion 23 and the end face of the padding layer 24 is R1.

[0060] In the existing conventional display module 300 structure, at the starting point of the pad bending (also known as the flexible screen bending device), during the secondary bending of the flexible screen body 2, the bending radius of the bending part will change shape due to the bending stress. The shape of the bending part 23 will change under the action of bending stress, that is, the distance between the two ends of the bending part 23 is greater than the diameter 2R1 of the bending part 23. Figure 6 In this embodiment, during the design phase, the curved portion 23 is optimized from a standard circle to an ellipse, i.e., R1 < 1 / 2C2, ensuring that the actual dimension in the X direction does not increase after bending and improving the R-angle shape. Here, R1 is the maximum distance between the end face of the curved portion 23 and the padding layer 24, which is also the bending radius of the flexible screen 2 during a conventional first bending. In this embodiment, the padding layer 24 is set to have a fifth thickness C2 to support both ends of the curved portion 23, making the fifth thickness C2 greater than the diameter 2R1 of the curved portion 23. This effectively supports the curved portion 23 that undergoes stress deformation, preventing the curved portion 23 from collapsing after a second bending and ensuring the deformation shape of the flexible screen 2.

[0061] In some embodiments, the padding layer 24 has a section with a fourth thickness C1, and the side of the padding layer 24 facing the cover plate 1 has a concave arc surface.

[0062] like Figure 7 The dashed lines indicate the edge of the uniform thickness pad 24. In this embodiment, a section of the pad 24 with a fourth thickness C1 is obtained by concavening the edge of the pad 24 facing the cover plate 1, while the edge of the pad 24 facing away from the cover plate 1 remains unchanged. The thickness of the pad 24 corresponding to the maximum concavity point of this concave arc surface is the fourth thickness C1. From the maximum concavity point towards both ends, the fourth thickness C1 gradually increases to the fifth thickness C2 and the third thickness C0. It can be understood that in the section corresponding to the arc surface region, the fourth thickness C1 is a variable value.

[0063] Similarly, such as Figure 8 As shown, the dashed lines represent the edges of the uniform thickness padding layer 24, while the solid lines represent the actual edges of the unequal thickness padding layer 24 in this embodiment. It can be seen that the section of the padding layer 24 with a fifth thickness C2 has a protruding structure on the surface facing the cover plate 1, forming a locally thickened padding layer 24. The surface of the padding layer 24 facing the cover plate 1 has a smooth transition surface to avoid stress abrupt changes caused by protrusions. It should be noted that the padding layer 24 with a fifth thickness C2 can be achieved by simultaneously increasing the same thickness on both sides along the Z direction, or by increasing the thickness only on the side facing the optical adhesive layer 3.

[0064] In this embodiment of the invention, the shim is an integral shim block, which is easy to process and manufacture and provides good support.

[0065] In some embodiments, the difference between the second thickness A1 and the first thickness A0 is less than or equal to 0.05 mm. That is, the difference between the second total thickness a1 and the first total thickness a0 is less than or equal to 0.05 mm.

[0066] In the design of the hyperbolic or quadrature flexible screen 2, the first thickness A0 of the optical adhesive layer 3 is conventionally selected as 0.15mm. The second thickness A1 is obtained by thickening the optical adhesive layer 3 in the curved area. It can also be considered as adding an optical adhesive layer 3 in the curved area to obtain an optical adhesive layer 3 with a second thickness A1. Preferably, the maximum value of A1-A0 is 0.05mm, that is, the second thickness A1 is greater than 0.15mm and less than 0.15mm+0.05mm. This can increase the support for the inner area of ​​the R-angle of the secondary bending of the flexible screen 2 and reduce the extension of the outer edge of the flexible screen 2 towards the outer edge of the cover plate 1 caused by the collapse deformation of the flexible screen 2 towards the inner concave surface of the cover plate 1. It should be noted that the parameters 0.15mm and 0.05mm in this embodiment are the dimensions after the cover plate 1 and the curved surface of the flexible screen 2 are bonded together.

[0067] In some embodiments, the end of the cover plate 1 and the flexible screen 2 facing the bending portion 23 is bent along the thickness direction of the flexible screen 2 to form a bending portion. The bending portion has a first arc length L1, and the arc surface region has a second arc length L2. The second arc length L2 is not greater than one-third of the first arc length L1.

[0068] like Figure 9 As shown, along the positive Y-direction, the cover plate 1 and the flexible screen 2 undergo secondary bending and heating bonding under the action of the contouring PAD. After the secondary bending, the cover plate 1 and the flexible screen 2 form a bent portion. The R-angle region is located within the bent portion. From the connection between the planar region and the bent portion to the edge of the flexible screen 2, the arc surface of the flexible screen 2 facing the cover plate 1 has a first arc length L1 along the Y-direction, and the arc surface region has a second arc length L2. The second arc length L2 is not greater than the first arc length L1, and preferably the second arc length L2 is equal to one-third of the first arc length L1. The center of the arc surface region is the center of the R-angle formed by the bending of the cover plate 1. Thus, the problem of reduced curvature of the flexible screen 2 caused by the accumulation of optical adhesive between the inner surface of the bent R-angle of the cover plate 1 and the outer surface of the flexible screen 2 can be avoided.

[0069] Example 2: A display module in which the thickness of the optical adhesive layer 3 remains constant in the curved area, and the inner wall of the cover plate 1 has a protrusion height B, where B = a1 - a0.

[0070] To make the explanation clearer, this second embodiment only describes the differences from the first embodiment; the parts not described in detail are the same as in the first embodiment.

[0071] This embodiment provides a display module 300, including a cover plate 1 and a flexible screen 2, which are bonded together by an optical adhesive layer 3. The flexible screen 2 includes a first extension 21, a second extension 22, and a bent portion 23 connecting the first extension 21 and the second extension 22, and a padding layer 24 is provided between the first extension 21 and the second extension 22.

[0072] In this design, the end of the cover plate 1 and the flexible screen 2 facing the bending portion 23 is bent twice along the thickness direction of the flexible screen 2, forming a planar region and an arcuate region between the cover plate 1 and the flexible screen 2. The optical adhesive layer 3 has a uniform first thickness A0 in both the planar and arcuate regions, i.e., the thickness remains constant. In the arcuate region, the inner sidewall of the cover plate 1 facing the optical adhesive layer 3 has a convex arcuate surface facing the optical adhesive layer 3, and the protrusion height B of the convex arcuate surface is a1-a0. From the planar region to the bending portion 23, the thickness of the padding layer 24 first decreases and then increases.

[0073] In this embodiment of the invention, the increased thickness of the cover plate 1 in the curved area can compensate for insufficient flow caused by the accumulation of optical adhesive in the curved area of ​​the cover plate 1 during secondary bending. By thickening the inner side of the cover plate 1 towards the optical adhesive layer 3, the inner side of the R-angle is partially compensated, which can solve the problem of reduced curvature of the flexible screen 2, increase the minimum distance from the bending point (outer edge) of the flexible screen 2 to the edge of the cover plate 1, avoid interference between the flexible screen 2 and the middle frame, and thus facilitate the achievement of an extremely narrow bezel. By setting the padding height 24 as a structure of unequal thickness, the thickness of the padding height 24 first decreases and then increases in the direction from the planar area to the curved part 23. Thus, by setting the height of the padding block, the end where the curved part 23 of the flexible screen 2 is located can be supported, preventing the R-angle shape of the flexible screen 2 from collapsing during secondary bending. After the entire flexible screen 2 undergoes secondary bending, the padding height 24 can ensure the secondary bending shape of the flexible screen 2, avoid shape changes of the flexible screen 2, and facilitate the achievement of an extremely narrow bezel.

[0074] Example 3: A display module in which the thickness of the cover plate and the optical adhesive layer are increased simultaneously in the curved area, and the sum of the increased thicknesses is B, where B = a1 - a0.

[0075] To make the explanation clearer, this embodiment three only describes the differences from embodiment one or embodiment two, while the parts not described in detail are the same as those in embodiment one or embodiment two.

[0076] like Figure 11This embodiment provides a display module 300, including a cover plate 1 and a flexible screen 2. The cover plate 1 and the flexible screen 2 are bonded together by an optical adhesive layer 3. The flexible screen 2 includes a first extension 21, a second extension 22 formed by bending once, and a bent portion 23 connecting the first extension 21 and the second extension 22. A padding layer 24 is provided between the first extension 21 and the second extension 22.

[0077] In this process, the end of the cover plate 1 and the flexible screen 2 facing the bending portion 23 is bent twice along the thickness direction of the flexible screen 2, forming a planar region and an arc-shaped region between the cover plate 1 and the flexible screen 2. In the planar region, the thickness of the cover plate 1 and the optical adhesive layer 3 remains unchanged, with a first total thickness a0, and the optical adhesive layer 3 has a first thickness A0. In the arc-shaped region, the side of the cover plate 1 facing the optical adhesive layer 3 has a convex arc surface facing the optical adhesive layer 3, and the protrusion height of the convex arc surface is a first increased thickness B1. The optical adhesive layer 3 has a second increased thickness B2 relative to the first thickness A0, B1+B2=B=a1-a0. From the planar region to the bending portion 23, the thickness of the padding layer 24 first decreases and then increases.

[0078] In this embodiment of the invention, the increased thickness of the cover plate 1 and the optical adhesive layer 3 in the curved area can compensate for the cumulative loss of the optical adhesive in the curved area of ​​the cover plate 1 during the secondary bending. The increased thickness of the inner side of the cover plate 1 protruding towards the optical adhesive layer 3, along with the increased thickness of the optical adhesive layer 3, partially compensates for the inner side of the R-angle, thus solving the problem of reduced curvature of the flexible screen 2. This increases the minimum distance from the bending point of the flexible screen 2 to the edge of the cover plate 1, avoiding interference between the flexible screen 2 and the mid-frame, and thus facilitating the achievement of an extremely narrow bezel. By setting the padding height 24 to an unequal thickness structure, the thickness of the padding height 24 first decreases and then increases in the direction from the planar area to the bent portion 23. This allows for support of the end of the flexible screen 2 where the bent portion 23 is located by setting the height of the padding block, preventing the R-angle shape of the flexible screen 2 from collapsing during the secondary bending. After the entire flexible screen 2 undergoes a secondary bending, the padding height 24 ensures the secondary bending shape of the flexible screen 2, avoiding shape changes and facilitating the achievement of an extremely narrow bezel. The thickened portion of the cover plate 1 is located only on the inner side of the cover plate 1 facing the optical adhesive layer 3, while the thickened portion of the optical adhesive layer 3 can be located on both sides or any side of the optical adhesive layer 3.

[0079] Using the display module 300 provided in the above embodiments, this embodiment of the invention also provides a display device 200, including the display module 300 provided by this invention. The display device 200 achieves a design structure with an extremely narrow bottom bezel by fixing the display module 300 to the mid-frame.

[0080] Using the display device 200 provided in the above embodiments, this embodiment of the invention also provides an electronic product 100, which includes the display device 200 provided by this invention. The electronic product 100 has at least one display device 200, which has an extremely narrow bottom bezel design structure, thereby facilitating the obtaining of an electronic product 100 with an extremely narrow bezel.

[0081] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A display module, comprising a cover plate (1) and a flexible screen body (2), wherein the cover plate (1) and the flexible screen body (2) are bonded together by an optical adhesive layer (3); the flexible screen body (2) comprises a first extension (21), a second extension (22), and a bent portion (23) formed after a single bending, wherein the two ends of the bent portion (23) are respectively connected to the first extension (21) and the second extension (22), and a padding layer (24) is provided between the first extension (21) and the second extension (22); characterized in that: The cover plate (1) and the flexible screen (2) are bent twice along the thickness direction of the flexible screen (2) at one end facing the bending portion (23), forming a planar area and an arc-shaped area between the cover plate (1) and the flexible screen (2). In the planar area, the cover plate (1) and the optical adhesive layer (3) have a first total thickness a0. In the arc-shaped area, the cover plate (1) and the optical adhesive layer (3) have a second total thickness a1. The second total thickness a1 is greater than the first total thickness a0. In the direction from the planar region to the curved portion (23), the thickness of the padding layer (24) first decreases and then increases.

2. The display module according to claim 1, characterized in that, The difference between the second total thickness a1 and the first total thickness a0 is less than or equal to 0.05 mm.

3. The display module according to claim 1, characterized in that, In the planar region, the optical adhesive layer (3) has a first thickness A0, and in the arcuate region, the optical adhesive layer (3) has a second thickness A1, the second thickness A1 being greater than the first thickness A0.

4. The display module according to claim 1, characterized in that, In the arcuate region, the cover plate (1) has a convex arcuate surface facing the optical adhesive layer (3) on the side facing the optical adhesive layer (3), and the protrusion height of the convex arcuate surface is B = a1 - a0.

5. The display module according to claim 1, characterized in that, In the arcuate region, the optical adhesive layer (3) has a first increased thickness B1, and the cover plate (1) has a second increased thickness B2, B1+B2=a0-a1.

6. The display module according to claim 1, characterized in that, The padding layer (24) has a third thickness C0 in the section corresponding to the planar region, and the padding layer (24) has a fourth thickness C1 in the section corresponding to the arcuate region, wherein the fourth thickness C1 is less than the third thickness C0.

7. The display module according to claim 6, characterized in that, The fourth thickness C1 is greater than 90% of the third thickness C0.

8. The display module according to claim 6, characterized in that, The section of the padding layer (24) connecting to the bend (23) has a fifth thickness C2, which is greater than the third thickness C0.

9. The display module according to claim 8, characterized in that, The fifth thickness C2 is less than 110% of the third thickness C0.

10. The display module according to claim 6, characterized in that, The curved portion (23) has a bending radius R1, the third thickness C0 is equal to the diameter 2R1 of the curved portion (23), and the maximum distance between the curved portion (23) and the end face of the padding layer (24) is R1.

11. The display module according to claim 6, characterized in that, The padding layer (24) has a section with the fourth thickness C1, and the padding layer (24) has a concave arc surface on the side facing the cover plate (1).

12. The display module according to claim 1, characterized in that, The cover plate (1) and the flexible screen (2) are bent along the thickness direction of the flexible screen (23) to form a bent portion. The bent portion has a first arc length L1 and the arc surface region has a second arc length L2. The second arc length L2 is not greater than one-third of the first arc length L1.

13. A display device, characterized in that, Includes the display module (300) as described in any one of claims 1-12.

14. An electronic product, characterized in that, Includes the display device (200) as described in claim 13.

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