Display modules and mobile terminals

Abstract

This application discloses a display module and a mobile terminal. The display module includes a display panel, a cover plate, and a protective layer. The display panel includes a first body, a bending portion, and a second body. The protective layer includes a first protective portion, a second protective portion, and a bending protective portion continuously disposed thereon. The first protective portion covers a portion of the first body, the second protective portion covers a portion of the second body, and the bending protective portion covers the bending portion. The bending stiffness of the bending protective portion near the first protective portion is less than that of the bending protective portion near the second protective portion. In this application, the reduced bending stiffness of the bending protective portion near the first protective portion makes the bending portion in that area easier to bend. The increased bending stiffness of the bending protective portion near the second protective portion improves the support force of the bending portion in that area, which helps to make the arc angle of the bending portion tend to be rounded, alleviates the abnormal shape of the bending portion near the cover plate, improves the uniformity of the stress on the bending portion, and reduces the risk of circuit breakage in the display panel.

Description

Technical Field

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

[0002] With the trend of electronic devices pursuing the ultimate full-screen design, displays (such as mobile phones) are emerging in the market. In order to pursue the diversification of the appearance of display devices, the cover glass of the display has evolved from double-curved surfaces on the left and right sides to curved surfaces on all four sides or full-curved shapes.

[0003] In the curvature bonding of a full-curved display, the higher the curvature, the greater the tensile stress on the bent part of the display, especially in the bending areas on both sides of the screen. In this area, there are two bending forces perpendicular to each other along the bending axis, which makes the bending radius of the bending area near the cover plate smaller. This irregular bending can cause the internal circuitry of the panel to break, resulting in abnormal display. Summary of the Invention

[0004] This application provides a display module and a mobile terminal to solve the technical problem of irregular bending in the bending area on both sides of the existing full-curve display module.

[0005] To address the above issues, the technical solution provided in this application is as follows:

[0006] This application provides a display module, which includes:

[0007] The display panel includes a first body, a second body, and a bent portion disposed between the first body and the second body, wherein the second body is disposed on the side opposite to the light-emitting surface of the display panel;

[0008] A cover plate, disposed on the display panel, includes a first curved portion corresponding to the bent portion. The first curved portion includes a first curved segment and second curved segments located on both sides of the first curved segment. The minimum curvature of the first curved segment is less than or equal to the maximum curvature of the second curved segment, and the curvature of the second curved segment is greater than 0.

[0009] A protective layer is disposed on the surface of the display panel. The protective layer includes a first protective portion, a second protective portion, and a bending protective portion that are continuously disposed thereon. The first protective portion covers a portion of the first body, the second protective portion covers a portion of the second body, and the bending protective portion covers the bending portion.

[0010] The bending stiffness of the bending protection part closer to the first protection part is less than that of the bending protection part closer to the second protection part.

[0011] In the display module of this application, the thickness of the first protective part gradually decreases in the direction from the first protective part to the second protective part, and the thickness of the bending protective part is equal at any position on the side close to the first protective part.

[0012] In the display module of this application, the display panel further includes a polarizer disposed on the display panel, and the side of the first protective portion away from the bending protective portion contacts the polarizer;

[0013] The thickness of the first protective part on the side away from the bending protective part is greater than the thickness of the polarizer.

[0014] In the display module of this application, the display module further includes a first back plate disposed on the side of the first body away from the light-emitting surface;

[0015] The bending protection includes a first end near the first protective part, the thickness of the first end is equal at any position, and the orthographic projection of the first end on the first back plate is located inside the first back plate.

[0016] In the display module of this application, the interface between the polarizer and the first protective part is the first interface, and the distance between the first interface and the first end is greater than or equal to 250um and less than or equal to 500um.

[0017] In the display module of this application, the display module further includes an optical adhesive layer disposed between the polarizer and the cover plate, the optical adhesive layer covering the polarizer and extending between the protective layer and the cover plate;

[0018] The thickness of the optical adhesive layer corresponding to the polarizer is greater than the thickness of the optical adhesive layer corresponding to the protective layer.

[0019] In the display module of this application, the display module further includes an adhesive layer located on the side of the second body away from the light-emitting surface, and the side of the second protective portion away from the bending protective portion is in contact with the adhesive layer;

[0020] The display module further includes a first back plate and a second back plate disposed between the first body and the second body. The first back plate is disposed close to the first body, and the second back plate is disposed close to the second body. The second back plate includes a back plate end face close to the bent portion. The contact surface between the adhesive layer and the second protective portion is a third interface. The distance between the third interface corresponding to the second bent section and the back plate end face is less than the distance between the third interface corresponding to the first bent section and the back plate end face.

[0021] In the display module of this application, the distance between the third interface and the end face of the back plate gradually increases in the direction from the second curved section to the first curved section.

[0022] In the display module of this application, the thickness of the second protective part near the adhesive layer is negatively correlated with the distance between the third interface and the end face of the back plate.

[0023] In the display module of this application, the thickness of the second protective part near the adhesive layer is less than the thickness of the adhesive layer.

[0024] In the display module of this application, the adhesive layer is further provided with a groove facing the protective layer on the side away from the protective layer;

[0025] The display module further includes a driver chip, which is disposed within the groove.

[0026] In the display module of this application, when the radius of curvature of the cover plate is less than a threshold, the radius of curvature of the cover plate is positively correlated with the radius of curvature of the corresponding position in the third interface.

[0027] In the display module of this application, the curvature of the cover plate gradually decreases in the direction from the first curved section to the second curved section;

[0028] Alternatively, in the direction from the first curved segment to the second curved segment, the cover plate includes a continuous first interval and a second interval, wherein the curvature of the first interval is a constant value and the curvature of the second interval gradually decreases.

[0029] This application also proposes a mobile terminal, wherein the mobile terminal includes a terminal body and the aforementioned display module, and the terminal body and the display module are combined into one unit.

[0030] Beneficial effects: The reduced bending stiffness of the bending protection part near the first protection part in this application makes the bending part in this area easier to bend. The increased bending stiffness of the bending protection part near the second protection part improves the support force of the bending part in this area, which helps to make the arc angle of the bending part tend to be round, alleviates the abnormal shape of the bending part near the cover plate, improves the uniformity of the stress on the bending part, and reduces the risk of line breakage in the display panel. Attached Figure Description

[0031] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0032] Figure 1 A top view of the curved surface of an existing full-curved display screen, facing away from the light-emitting surface.

[0033] Figure 2 This is a structural diagram of the cover plate for an existing full-curved display screen;

[0034] Figure 3 A cross-sectional view of the bent section in an existing full-curve display screen;

[0035] Figure 4 This is a simplified top view of the display module structure in this application;

[0036] Figure 5 for Figure 4 The first type of cover plate curvature radius distribution diagram of the mid-section ZZ;

[0037] Figure 6 for Figure 4 The second type of cover plate curvature radius distribution diagram for the mid-section ZZ;

[0038] Figure 7 for Figure 4 Cross-sectional view of the mid-section WW;

[0039] Figure 8 This is a diagram showing the film structure of the display module in this application;

[0040] Figure 9 This is a cross-sectional view of the module when it is not bent, as shown in this application.

[0041] Figure 10 This is a first top view of the module when it is not bent, as shown in this application.

[0042] Figure 11 This application shows the thickness distribution of the second protective layer near the adhesive layer in the module;

[0043] Figure 12 for Figure 11 Cross-sectional view of mid-section MM1;

[0044] Figure 13 for Figure 11 Cross-sectional view of mid-section MM2;

[0045] Figure 14 for Figure 11 Cross-sectional view of section MM3;

[0046] Figure 15 This is a second top view of the structure of the module when it is not bent, as shown in this application. Detailed Implementation

[0047] 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 scope of protection of this application.

[0048] Figure 1 The structure shown is a top view of the curved surface of the full-curved display screen facing away from the light-emitting surface. Figure 2 The cover plate structure shown is a fully curved cover plate CG, meaning the cover plate is bent at any position. The higher the curvature, the greater the tensile stress on the bent display panel 10, especially in the bending areas on both sides of the display panel 10. In this area, there are two bending forces perpendicular to each other along the bending axis, i.e., bending forces in the X and Y directions. This causes the bending radius of the bending area closer to the cover plate to decrease. For example... Figure 3 The irregular bending structure causes the display panel 10 in region O to tilt towards the cover plate 20, which can cause the internal circuitry of the display panel 10 to break, resulting in abnormal display of the display panel 10.

[0049] Please see Figures 4 to 11 This application provides a display module 100, which may include a display panel 10, a cover plate 20 disposed on the display panel 10, and a protective layer 30 disposed on the surface of the display panel 10.

[0050] In this embodiment, the display panel 10 can be a flexible display panel 10. The display panel 10 may include a first body 110, a second body 120 and a bending portion 130 disposed between the first body 110 and the second body 120. The second body 120 is disposed on the side away from the light-emitting surface of the display panel 10.

[0051] In this embodiment, the cover plate 20 includes a first curved portion 210 corresponding to the bent portion 130. The first curved portion 210 includes a first curved segment 211 and a second curved segment 212 located on both sides of the first curved segment 211. The minimum value of the curvature of the first curved segment 211 is less than or equal to the maximum value of the curvature of the second curved segment 212, and the curvature of the second curved segment 212 is greater than 0.

[0052] In this embodiment, the protective layer 30 includes a first protective portion 310, a second protective portion 320, and a bending protective portion 330 that are continuously disposed. The first protective portion 310 covers a portion of the first body 110, the second protective portion 320 covers a portion of the second body 120, and the bending protective portion 330 covers the bending portion 130. The bending stiffness of the bending protective portion 330 near the first protective portion 310 is less than the bending stiffness of the bending protective portion 330 near the second protective portion 320.

[0053] It should be noted that, in Figure 4 In the structure, the cover plate 20 includes two second curved portions 220 located on both sides of the first curved portion 210. The second curved portions 220 do not correspond to the bent portion 130, that is, in the top view direction of the display panel 10, the bent portion 130 and the second curved portion 220 of the display panel 10 are not overlapped. The second curved portion 220 and the second curved segment 212 are continuously arranged, and the minimum value of the curvature of the second curved portion 220 is greater than the maximum value of the curvature of the second curved segment 212. Since the bent portion 130 and the second curved portion 220 are not overlapped, the bending of the second curved portion 220 in this application does not apply a force in the corresponding direction to the bent portion 130. The irregular bending of the bent portion 130 mainly comes from the change in the curvature of the second curved segment 212.

[0054] It should be noted that, Figure 4 The variation law of the radius of curvature of the cover plate 20 along section ZZ can be as follows: Figure 5 and Figure 6 As shown, the reciprocal of the radius of curvature is the curvature of the curve; the following discussion will focus on the radius of curvature. Figure 5 In the structure, the radius of curvature of the cover plate 20 is largest at point B, i.e., on the central axis of the cover plate 20, and gradually decreases in the direction from point B to the endpoints C1 and C2 of the cover plate 20; Figure 6 In the structure, the radius of curvature of the cover plate 20 is constant in the direction from point B to points D1 and D2 on both sides, and the radius of curvature at points D1 and D2 shows inflection points, gradually decreasing. Figure 5 and Figure 6 In the graph showing the change in radius of curvature, when the radius of curvature decreases to a certain value, for example... Figure 5 X1 and Figure 6 The bending force at position X2 along both the X and Y directions causes the bent portion 130 of the display panel 10 to shift toward the cover plate 20, resulting in an irregular bend. As the radius of curvature further decreases, the shift of the bent portion 130 toward the cover plate 20 becomes more severe.

[0055] Therefore, this application makes the bending stiffness of the bending protection portion 330 near the first protection portion 310 less than that of the bending protection portion 330 near the second protection portion 320. The reduction in the bending stiffness of the bending protection portion 330 near the first protection portion 310 makes the bending portion 130 in that area easier to bend. The increase in the bending stiffness of the bending protection portion 330 near the second protection portion 320 improves the support force of the bending portion 130 in that area, which helps to make the arc angle of the bending portion 130 tend to be round, alleviates the abnormal shape of the bending portion 130 near the cover plate 20, improves the uniformity of the force on the bending portion 130, and reduces the risk of line breakage in the display panel 10.

[0056] The technical solution of this application will now be described in conjunction with specific embodiments.

[0057] Please see Figure 4 The display module 100 includes a display area AA and a non-display area NA adjacent to the display area AA. Optionally, the non-display area NA surrounds the display area AA, so that the display area AA is surrounded by the non-display area NA. The display area AA is the area within the display module 100 used for display functions, and it contains multiple display units that implement its display functions. The non-display area NA may be a border area of ​​the display module 100, and it may contain functional components that assist the display units within the display area AA in displaying information.

[0058] In this embodiment, please refer to Figure 7 , Figure 7 for Figure 4 The cross-sectional view of the mid-section WW, where WW can be any cross-section of the lower frame area of ​​the display module. The display module 100 may include a display panel 10, a polarizer 40 disposed on the display panel 10, an optical adhesive layer 50 disposed on the polarizer 40, and a cover plate 20 disposed on the optical adhesive layer 50.

[0059] In this embodiment, please refer to Figure 8 The display panel 10 may include a substrate 140, a driving circuit layer 150 disposed on the substrate 140, a pixel definition layer 160 and a light-emitting device layer 170 disposed on the driving circuit layer 150, an encapsulation layer 180 disposed on the pixel definition layer 160, and a touch layer 190 disposed on the encapsulation layer 180.

[0060] In this embodiment, the substrate 140 supports various layers disposed on the substrate 140. When the display panel 10 is a bottom-emitting light-emitting display device or a double-sided light-emitting display device, a transparent substrate is used. When the display panel 10 is a top-emitting light-emitting display device, a semi-transparent or opaque substrate, as well as a transparent substrate, can be used.

[0061] In this embodiment, the substrate 140 is made of an insulating material such as glass, quartz, or polymer resin. The substrate 140 can be a rigid substrate or a flexible substrate that can be bent, folded, rolled, etc. Examples of flexible materials for flexible substrates include, but are not limited to, polyimide (PI).

[0062] In this embodiment, please refer to Figure 8 The driving circuit layer 150 may include multiple thin-film transistors (TFTs). These TFTs can be etch-block type, back-channel etch type, or classified as bottom-gate TFTs, top-gate TFTs, etc., depending on the position of the gate and the active layer; there are no specific limitations. For example, Figure 6 The thin-film transistor shown is a top-gate thin-film transistor. This thin-film transistor may include a light-shielding layer 151 disposed on a substrate, a buffer layer 152 disposed on the light-shielding layer 151, an active layer 153 disposed on the buffer layer 152, a gate insulating layer 154 disposed on the active layer 153, a gate layer 155 disposed on the gate insulating layer 154, an interlayer insulating layer 156 disposed on the gate layer 155, a source / drain layer 157 disposed on the interlayer insulating layer 156, and a planarization layer 158 disposed on the source / drain layer 157. In this embodiment, the interlayer insulating layer 156 may be an integral layer, or as shown in the figure. Figure 8 The structure in the image is formed in the same photomask process as the gate layer 155. Figure 8 The structure of the thin-film transistor is only one example of this application, and other types of thin-film transistors are also applicable to this application.

[0063] In this embodiment, please refer to Figure 8 The light-emitting device layer 170 may further include an anode layer 171 disposed on the planarization layer 158, a light-emitting layer 172 disposed on the anode layer 171, and a cathode layer 173 disposed on the light-emitting layer 172. The anode layer 171 includes a plurality of anodes, the pixel definition layer 160 includes a plurality of pixel openings corresponding one-to-one with the plurality of anodes, and each pixel opening exposes the upper surface of an anode. The light-emitting layer may include a plurality of light-emitting pixels corresponding one-to-one with the plurality of anodes.

[0064] In this embodiment, please refer to Figure 8 The encapsulation layer 180 covers the pixel definition layer 160 and continuously covers multiple pixel openings and multiple light-emitting pixels; wherein, the encapsulation layer 180 may include at least a first inorganic encapsulation layer 181, a first organic encapsulation layer 182 and a second inorganic encapsulation layer 183 stacked on the pixel definition layer 160.

[0065] In this embodiment, please refer to Figure 8 The touch layer 190 may include a first touch metal layer and a second touch metal layer disposed on the encapsulation layer 180, and an insulating layer disposed between the first touch metal layer and the second touch metal layer. The touch layer 190 provided in this application embodiment may be mutually capacitive or self-capacitive, and the specific type and structure of the touch layer 190 may be selected according to actual needs.

[0066] In this embodiment, the polarizer 40 can be disposed above the touch layer 190, and there are no specific limitations.

[0067] In this embodiment, please refer to Figure 7The display module 100 also includes a back panel layer 60, which includes a first back panel 610 and a second back panel 620 that are separately disposed. The first back panel 610 and the second back panel 620 are disposed between the first body 110 and the second body 120. The first back panel 610 is located on the side of the first body 110 away from the light-emitting surface and is bonded to the first body 110 by an adhesive layer. The second back panel 620 is located on the side of the second body 120 close to the light-emitting surface and is bonded to the second body 120 by an adhesive layer. That is, the first back panel 610 and the second back panel 620 are located between the first body 110 and the second body 120.

[0068] In this embodiment, please refer to Figure 7 The display module 100 also includes a first support layer 70 and a second support layer 80 disposed between the first back plate 610 and the second back plate 620. The first support layer 70 and the first back plate 610 are bonded together by an adhesive layer, and the second support layer 80 and the second back plate 620 are bonded together by an adhesive layer. The material of the first support layer 70 can be stainless steel, and the material of the second support layer 80 can be foam or polyethylene terephthalate (PET), etc.

[0069] In this embodiment, please refer to Figure 7 The display module 100 may also include a protective layer 30 disposed on the display panel 10. The protective layer 30 covers the bending portion 130 and a portion of the first body 110 and the second body 120. The first protective portion 310 covers a portion of the first body 110, the second protective portion 320 covers a portion of the second body 120, and the bending protective portion 330 covers the bending portion 130.

[0070] The protective layer 30 is mainly used to protect the metal lines on the display panel 10 so that the metal lines are isolated from water and oxygen. However, in the prior art, more protective layer 30 material is coated in the area adjacent to the polarizer 40 so that the protective layer 30 can be set close to the polarizer 40. This setting may cause the protective layer 30 material on the bending part 130 near the first body 110 to be more than the protective layer 30 material on the bending part 130 far away from the first body 110. This increases the bending stiffness of the bending protection part 330 near the first protection part 310, increases the bending strength of the bending part 130 corresponding to the bending protection part 330, and makes the bending radius of the bending part 130 near the cover plate 20 in this area smaller, so as to form an abnormal bend.

[0071] In the display module 100 of this application, the thickness of the first protective part 310 gradually decreases in the direction from the first protective part 310 to the second protective part 320, and the thickness of the bending protective part 330 is equal at any position on the side close to the first protective part 310.

[0072] In this embodiment, please refer to Figure 7 and Figure 9 In the direction away from the polarizer 40, the thickness of the first protective portion 310 gradually decreases, and the thickness of the bent protective portion 330 on the side closest to the first protective portion 310 is equal, or as... Figure 7 In the structure, the thickness of any position in the bending protection part 330 is equal, and in the region near the bending part 130, the thickness of the first protection part 310 can be equal to the thickness of the bending protection part 330; at the same time, since the first protection part 310 is in contact with the polarizer 40, the thickness of the protective layer 30 material of the first protection part 310 near the polarizer 40 is the greatest.

[0073] In this embodiment, the present application controls the distance between the edge of the polarizer 40 near the bending portion 130 and the edge of the first back plate 610 near the bending portion 130, so that the material of the protective layer 30 flows smoothly within the distance, thereby retaining the uneven thickness area of ​​the protective layer 30 in the first protective portion 310, and making the thickness of the first protective portion 310 near the bending protective portion 330 equal to the thickness of the bending protective portion 330, so that the thickness at any position on the bending protective portion 330 is equal, reducing the bending stiffness of the bending protective portion 330 near the first protective portion 310, making the bending portion 130 corresponding to the bending protective portion 330 easier to bend, which is conducive to making the arc angle of the bending portion 130 tend to be round, alleviating the abnormal shape of the bending portion 130 near the cover plate 20, improving the uniformity of the stress on the bending portion 130, and reducing the risk of line breakage in the display panel 10.

[0074] In the display module 100 of this application, please refer to Figure 7 and Figure 9 The thickness of the first protective portion 310 on the side away from the bending protective portion 330 can be greater than the thickness of the polarizer 40. In order to allow the protective layer 30 to be disposed close to the polarizer 40 and to retain as much of the material of the protective layer 30 as possible on the first body 110, the thickness of the first protective portion 310 on the side close to the polarizer 40 is the largest. At the same time, in order to avoid the side of the polarizer 40 being exposed, the thickness of the first protective portion 310 needs to be greater than the thickness of the polarizer 40 so that the first protective portion 310 completely covers the side of the polarizer 40.

[0075] In the display module 100 of this application, please refer to Figure 7 and Figure 9 The display module 100 also includes an optical adhesive layer 50 disposed between the polarizer 40 and the cover plate 20. The optical adhesive layer 50 covers the polarizer 40 and extends between the protective layer 30 and the cover plate 20. The optical adhesive layer 50 is used to bond the polarizer 40 and the cover plate 20.

[0076] In this embodiment, the thickness of the optical adhesive layer 50 corresponding to the polarizer 40 can be greater than the thickness of the optical adhesive layer 50 corresponding to the protective layer 30. Since the thickness of the first protective portion 310 needs to be greater than the thickness of the polarizer 40 to avoid exposing the sides of the polarizer 40, the first protective portion 310 completely covers the sides of the polarizer 40. To avoid excessive unsupported area between the cover plate 20 and the protective layer 30, which would cause the cover plate 20 to press down towards the display panel 10, the optical adhesive layer 50 extends between the protective layer 30 and the cover plate 20, covering a portion of the first protective portion 310.

[0077] In the display module 100 of this application, please refer to Figure 7 and Figure 9 The bending protection portion 330 includes a first end portion 302 near the first protection portion 310, the thickness of the first end portion 302 is equal at any position, and the orthographic projection of the first end portion 302 on the back plate layer 60 is located within the first back plate 610.

[0078] In this embodiment, since the starting position of the bending of the display panel 10 is determined according to the end face position of the first back plate 610, and in order to ensure that the thickness of the protective layer 30 on the bending portion 130 is evenly distributed, the first end 302 of the first protective portion 310 and the bending protective portion 330 needs to be recessed inward towards the display area AA compared with the end face of the first back plate 610. That is, the orthographic projection of the first end 302 of the first protective portion 310 and the bending protective portion 330 on the back plate layer 60 is located inside the first back plate 610, so that at least part of the bending protective portion 330 and the first back plate 610 overlap, so that the thickness of the protective layer 30 on the bending portion 130 is evenly distributed.

[0079] In the display module 100 of this application, please refer to Figure 9 The distance L1 between the first interface 301 and the first end 302 can be greater than or equal to 250um and less than or equal to 500um.

[0080] In this embodiment, since the distance L1 between the first interface 301 and the first end 302 ranges from 250um to 500um, the distance between the first interface 301 and the end face of the first back plate 610 needs to be greater than the distance L1 between the first interface 301 and the first end 302.

[0081] In this embodiment, since the thickness of the first protective part 310 gradually decreases in the direction from the first protective part 310 to the second protective part 320, and the material of the protective layer 30 has a certain leveling distance, if the distance between the edge of the polarizer 40 and the edge of the first back plate 610 is too small, the leveling distance will enter the bending part 130, causing uneven thickness in the bending protective part 330. Therefore, this application controls the distance between the first interface 301 and the end face of the first back plate 610 to ensure a smooth transition from the first protective part 310 to the bending protective part 330, while avoiding the risk of material from the first protective part 310 flowing into the bending protective part 330. At the same time, the maximum value of the distance L1 between the first interface 301 and the first end 302 is 500um. Although increasing the distance can ensure a smooth transition from the first protective part 310 to the bending protective part 330, it increases the width of the non-display area NA of the display panel 10, which is not conducive to narrow bezel design.

[0082] In the display module 100 of this application, please refer to Figures 10 to 15 The display module 100 also includes an adhesive layer 90 that contacts the surface of the second body 120 away from the light-emitting surface, and the side of the second protective part 320 away from the bending protective part 330 contacts the adhesive layer 90.

[0083] In this embodiment, the contact surface between the adhesive layer 90 and the second protective part 320 is the third interface 303. The second back plate 620 includes a back plate end face 304 near the bent part 130. The distance P2 between the third interface 303 corresponding to the second bent section 212 and the back plate end face 304 is smaller than the distance P1 between the third interface 303 corresponding to the first bent section 211 and the back plate end face 304.

[0084] That is, when the display panel 10 is not bent, in the direction from the first protective portion 310 to the second protective portion 320, the distance between the third interface 303 corresponding to the second bent segment 212 and the first protective portion 310 is less than the distance between the third interface 303 corresponding to the first bent segment 211 and the first protective portion 310; please refer to Figure 10 , Figure 10 This application shows a first top view of the module 100 when it is not bent, that is, the distance L2 between the third interface 303 corresponding to the second bent segment 212 and the first interface 301 is less than the distance L3 between the third interface 303 corresponding to the first bent segment 211 and the first interface 301.

[0085] In this embodiment, for Figure 5 and Figure 6Due to the significant change in the radius of curvature of the cover plate 20 in the second bending section 212, the bending of the second bending section 212 causes the bent portion 130 of the display panel 10 to be subjected to bending forces in both the X and Y directions. This causes the bent portion 130 of the display panel 10 to shift towards the cover plate 20, forming an irregular bend. (See also...) Figure 10 The adhesive layer 90 in this application ensures that the distance between the third interface 303 in the area where the second curved segment 212 is located and the first protective part 310 is smaller than the distance between the third interface 303 in the area where the first curved segment 211 is located and the first protective part 310. Since the protective layer 30 material has a certain leveling distance, the adhesive layer 90 obstructs the flow of the protective layer 30 material, causing the protective layer 30 material to accumulate near the adhesive layer 90, increasing the thickness of the second protective part 320. Furthermore, the third interface 303 in the area where the second curved segment 212 is located... The smaller distance between the protective layer 3 and the first protective part 310 allows the leveling distance of the protective layer 30 material to enter the bending part 130, thereby increasing the thickness of the bending protective part 330 near the second protective part 320 and increasing the bending stiffness of the bending protective part 330 near the second protective part 320. This, in turn, improves the support force of the bending part 130 in this area, which helps to make the arc angle of the bending part 130 tend to be round, alleviates the abnormal shape of the bending part 130 near the cover plate 20, improves the uniformity of the force on the bending part 130, and reduces the risk of line breakage in the display panel 10.

[0086] In the display module 100 of this application, please refer to Figures 10 to 15 In the direction from the second curved segment 212 to the first curved segment 211, the distance between the third interface 303 and the back plate end face 304 can gradually increase. For example... Figure 12 and Figure 14 The distance P2 between the third interface 303 and the back plate end face 304 is less than Figure 13 The distance P1 between the third interface 303 and the back plate end face 304 is described in the figure.

[0087] Please refer to the details. Figure 10 When the display panel 10 is not bent, the distance between the third interface 303 and the first protective part 310 gradually increases in the direction from the second bending segment 212 to the first bending segment 211, i.e., the X direction. For Figure 5 Because the radius of curvature gradually decreases in the direction from point B to the endpoints C1 and C2 of the cover plate 20, the bending force on the display panel 10 gradually increases in both directions. Therefore, in order to cope with this change, this application designs the adhesive layer 90 with an irregular shape on the side close to the second protective part 320 according to the change in the radius of curvature of the cover plate 20.

[0088] In this embodiment, since the total amount of material coated on the protective layer 30 is the same in any region, the change in the distance between the third interface 303 and the first protective part 310 causes the thickness of the second protective part 320 near the adhesive layer 90 to change simultaneously.

[0089] In this embodiment, the thickness of the second protective portion 320 near the adhesive layer 90 can be negatively correlated with the distance between the third interface 303 and the back plate end face 304. Please refer to [link / reference] for details. Figure 11 The curve diagram shows that the material of the protective layer 30 has a certain leveling distance, and the spacing between the third interface 303 and the first protective part 310 is set to determine whether the leveling of the material of the protective layer 30 enters the bending part 130.

[0090] For example, in this embodiment, please refer to Figures 12 to 14 , Figures 12 to 14 respectively Figure 10 Cross-sectional views of mid-sections MM1, MM2, and MM3. MM1 and MM3 can be arranged symmetrically with respect to MM2.

[0091] exist Figure 12 and Figure 14 In this process, since both cross sections MM1 and MM3 correspond to the areas of the second bending segment 212, the curvature of the cover plate 20 is relatively large, and the display panel 10 is subjected to large bending forces in two directions. The adhesive layer 90 has a larger dimension in the first direction, that is, the distance between the third interface 303 and the first protective part 310 is smaller. The flow of the protective layer 30 material into the bending part increases the thickness of the bending protective part 330 near the second protective part 320, thereby increasing the bending stiffness of the bending protective part 330 near the second protective part 320 and improving the support force of the bending part 130 in this area. This is beneficial to make the arc angle of the bending part 130 tend to be round. At the same time, there is more material in the second protective layer 30 accumulated on the adhesive layer 90, that is, the thickness of the second protective part 320 near the adhesive layer 90 is relatively thick.

[0092] Please see Figure 13 The cross section MM2 corresponds to the area of ​​the first bending segment 211. The curvature of the cover plate 20 is small, and the display panel 10 is subjected to small bending forces in two directions. The size of the adhesive layer 90 in the first direction is small, that is, the distance between the third interface 303 and the first protective part 310 is large. The leveling of the material of the protective layer 30 does not enter the bending part 130. The thickness of the bending protective part 330 near the second protective part 320 does not change, and the bending stiffness of the bending protective part 330 near the second protective part 320 does not increase. At the same time, the material of the second protective layer 30 accumulated on the adhesive layer 90 is less, that is, the thickness of the second protective part 320 near the adhesive layer 90 is smaller.

[0093] Therefore, when the distance between the third interface 303 and the back plate end face 304 is small, the thickness of the second protective part 320 near the adhesive layer 90 is large, and the leveling of the protective layer 30 material enters the bending part, increasing the thickness of the bending protective part 330 near the second protective part 320, thus increasing the bending stiffness of the bending protective part 330 near the second protective part 320; while when the distance between the third interface 303 and the back plate end face 304 is large, the thickness of the second protective part 320 near the adhesive layer 90 is small, the leveling of the protective layer 30 material does not enter the bending part 130, the thickness of the bending protective part 330 near the second protective part 320 does not change, and the bending stiffness of the bending protective part 330 near the second protective part 320 does not increase.

[0094] In this embodiment, Figure 12 and Figure 14 The structure allows the thickness of the bending protection portion 330 near the second protection portion 320 to be greater than the thickness of the bending protection portion 330 near the first protection portion 310. That is, due to the blocking effect of the adhesive layer 90, the material of the protective layer 30 extends towards the bending protection portion 330, thereby increasing the thickness of the bending protection portion 330 near the second protection portion 320 and thus improving the bending stiffness of the bending protection portion 330 near the second protection portion 320.

[0095] for Figure 6 In this structure, because the radius of curvature of the cover plate 20 is constant from point B to points D1 and D2 on both sides, and the radius of curvature at points D1 and D2 is at an inflection point, gradually decreasing, the bent portions 130 corresponding to points D1 and D2 are subjected to large bending forces in two directions; therefore, for Figure 6 The cover plate 20 structure, the curve EH of the adhesive layer 90 near the second protective part 320 can be Figure 15 In the structure, curve EH includes line segments EF, FG, and GH. Line segment FG is a straight line segment, while line segments EF and GH are curved segments. That is, when the radius of curvature of the cover plate 20 is less than a certain value, the bending force applied by the cover plate 20 to the display panel 10 in two directions causes the bent portion 130 of the display panel 10 to be irregularly bent, for example, in... Figure 5 Point X1 and Figure 6Point X2 in the middle, and the interface of the corresponding adhesive layer 90 near the second protective part 320 can be set as a curved segment, such as curved segments EF and GH. The setting of the curved segment reduces the distance between the third interface 303 and the first protective part 310. The leveling of the protective layer 30 material enters the bending part 130, increasing the thickness of the bending protective part 330 near the second protective part 320, thereby increasing the bending stiffness of the bending protective part 330 near the second protective part 320, thereby improving the support force of the bending part 130 in this area, which is conducive to making the arc angle of the bending part 130 tend to be round, alleviating the abnormal shape of the bending part 130 near the cover plate 20, improving the uniformity of the force on the bending part 130, and reducing the risk of line breakage in the display panel 10.

[0096] Therefore, in this embodiment, when the radius of curvature of the cover plate 20 is less than a certain threshold, for example... Figure 5 Point X1 and Figure 6 When the point X2 is in the third interface 303, the radius of curvature of the cover plate 20 is positively correlated with the radius of curvature of the corresponding position in the third interface 303.

[0097] In the display module 100 of this application, in Figure 12 and Figure 14 In the structure, the thickness of the second protective part 320 near the adhesive layer 90 can be less than the thickness of the adhesive layer 90, so as to avoid the material of the protective layer 30 covering the adhesive layer 90, thereby increasing the overall thickness of the display module 100.

[0098] In this embodiment, the material of the adhesive layer 90 can be polyethylene terephthalate (PET).

[0099] In the display module 100 of this application, please refer to Figure 10 and Figure 15 The adhesive layer 90 is provided with a groove 910 facing the protective layer 30 on the side away from the protective layer 30. The display module 100 also includes a driver chip 200, which is disposed in the groove 910.

[0100] In this embodiment, since the adhesive layer 90 is provided to form a second protective part 320 of different thicknesses, in order to reduce the waste of the display panel 10 size, the adhesive layer 90 of this application has an air-proof design to form a groove that can accommodate the driver chip.

[0101] In this embodiment, an adhesive layer 90 is provided in the terminal area of ​​the display module 100, so that the adhesive layer 90 covers the terminal area, effectively preventing the devices in the terminal area from breaking.

[0102] In this embodiment, Figure 10 and Figure 15 The medium structure can be applied in Figure 7In the structure, the thickness of the first protective part 310 gradually decreases in the direction away from the polarizer 40, while the thickness of any position in the bending protective part 330 is equal. This reduces the bending stiffness of the bending protective part 330 near the first protective part 310, making the bending part 130 in this area easier to bend. At the same time, an adhesive layer 90 is provided on the surface opposite to the light-emitting surface of the second body 120. For different curvatures of the cover plate 20, the adhesive layer 90 is designed with different curves on the side near the second protective part 320 to increase the bending stiffness of the bending protective part 330 near the second protective part 320. This increases the support force of this area on the bending part 130, which helps to make the arc angle of the bending part 130 tend to be rounded and alleviates the abnormal shape of the bending part 130 near the cover plate 20.

[0103] This application also proposes a mobile terminal, which includes a terminal body and the aforementioned display module, the terminal body and the display module being integrated into one unit. The terminal body can be components such as a circuit board bonded to the display panel, or a cover plate covering the display panel. The mobile terminal can include electronic devices such as mobile phones, televisions, and laptops.

[0104] 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.

[0105] The above provides a detailed description of a display module and mobile terminal provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A display module, characterized in that, include: The display panel includes a first body, a second body, and a bent portion disposed between the first body and the second body, wherein the second body is disposed on the side opposite to the light-emitting surface of the display panel; A cover plate, disposed on the display panel, includes a first curved portion corresponding to the bent portion. The first curved portion includes a first curved segment and second curved segments located on both sides of the first curved segment. The minimum curvature of the first curved segment is less than or equal to the maximum curvature of the second curved segment, and the curvature of the second curved segment is greater than 0. A protective layer is disposed on the surface of the display panel. The protective layer includes a first protective portion, a second protective portion, and a bending protective portion that are continuously disposed. The first protective portion covers a portion of the first body, the second protective portion covers a portion of the second body, and the bending protective portion covers the bending portion. The bending stiffness of the bending protective portion near the first protective portion is less than the bending stiffness of the bending protective portion near the second protective portion. An adhesive layer is located on the side of the second body away from the light-emitting surface, and the side of the second protective part away from the bending protective part is in contact with the adhesive layer; A first back plate and a second back plate are disposed between the first body and the second body. The first back plate is disposed close to the first body, and the second back plate is disposed close to the second body. The second back plate includes a back plate end face close to the bent portion. The contact surface between the adhesive layer and the second protective part is a third interface. The distance between the third interface corresponding to the second curved section and the end face of the back plate is smaller than the distance between the third interface corresponding to the first curved section and the end face of the back plate.

2. The display module according to claim 1, characterized in that, In the direction from the first protective part to the second protective part, the thickness of the first protective part gradually decreases, and the thickness of the bending protective part is equal at any position on the side close to the first protective part.

3. The display module according to claim 2, characterized in that, The display panel further includes a polarizer disposed on the display panel, and the side of the first protective portion away from the bending protective portion is in contact with the polarizer; The thickness of the first protective part on the side away from the bending protective part is greater than the thickness of the polarizer.

4. The display module according to claim 3, characterized in that, The display module also includes a first back plate disposed on the side of the first body away from the light-emitting surface; The bending protection includes a first end near the first protective part, the thickness of the first end is equal at any position, and the orthographic projection of the first end on the first back plate is located inside the first back plate.

5. The display module according to claim 4, characterized in that, The interface between the polarizer and the first protective part is the first interface, and the distance between the first interface and the first end is greater than or equal to 250 μm and less than or equal to 500 μm.

6. The display module according to claim 3, characterized in that, The display module further includes an optical adhesive layer disposed between the polarizer and the cover plate, the optical adhesive layer covering the polarizer and extending between the protective layer and the cover plate; The thickness of the optical adhesive layer corresponding to the polarizer is greater than the thickness of the optical adhesive layer corresponding to the protective layer.

7. The display module according to any one of claims 1 to 6, characterized in that, In the direction from the second curved section to the first curved section, the distance between the third interface and the end face of the back plate gradually increases.

8. The display module according to claim 7, characterized in that, The thickness of the second protective part near the adhesive layer is negatively correlated with the distance between the third interface and the end face of the back plate.

9. The display module according to any one of claims 1 to 6, characterized in that, The thickness of the second protective part near the adhesive layer is less than the thickness of the adhesive layer.

10. The display module according to any one of claims 1 to 6, characterized in that, The adhesive layer also has a groove facing the protective layer on the side away from the protective layer; The display module further includes a driver chip, which is disposed within the groove.

11. The display module according to any one of claims 1 to 6, characterized in that, When the radius of curvature of the cover plate is less than the threshold, the radius of curvature of the cover plate is positively correlated with the radius of curvature of the corresponding position in the third interface.

12. The display module according to claim 1, characterized in that, In the direction from the first bending segment to the second bending segment, the curvature of the cover plate gradually decreases; Alternatively, in the direction from the first curved segment to the second curved segment, the cover plate includes a continuous first interval and a second interval, wherein the curvature of the first interval is a constant value and the curvature of the second interval gradually decreases.

13. A mobile terminal, characterized in that, The mobile terminal includes a terminal body and a display module as described in any one of claims 1 to 12, wherein the terminal body and the display module are combined into one unit.

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