Display module and display device

Abstract

The invention discloses a display module and a display device, the display module comprises a flat area and a bending area arranged on at least one side of the flat area, and the bending area comprises at least one corner area; the display module comprises a display structure layer located in the flat area and the at least one corner area; the cover plate layer is located in the flat area and the at least one corner area and arranged on one side of the display structure layer; the bending structure layer is located in the at least one corner area and arranged between the display structure layer and the cover plate layer; the thickness of at least part of the bending structure layer is gradually reduced from the side, close to the flat area, of the bending structure layer to the side, away from the flat area, of the bending structure layer; and wrinkles of the display structure layer in the corner area are improved.

Description

Technical Field

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

[0002] Organic light-emitting diodes (OLEDs) and quantum dot light-emitting diodes (QLEDs) are active-matrix display devices with advantages such as self-illumination, wide viewing angle, high contrast, low power consumption, extremely high response speed, thinness, flexibility, and low cost. With the continuous development of display technology, flexible displays using OLEDs or QLEDs as light-emitting devices and controlled by thin-film transistors (TFTs) have become the mainstream products in the display field. Summary of the Invention

[0003] This application provides a display module and display device that improves the wrinkles in the corner area of ​​the display structure layer.

[0004] This application provides a display module, including a flat area and a bent area disposed on at least one side of the flat area, the bent area including at least one corner area; The display module includes: The display structure layer is located in the flat area and the at least one corner area; A cover plate layer is located in the flat area and the at least one corner area, and is disposed on one side of the display structure layer; A bent structural layer is located in the at least one corner region and disposed between the display structural layer and the cover plate layer; the thickness of at least a portion of the bent structural layer gradually decreases from the side of the bent structural layer closer to the flat region along the side of the bent structural layer away from the flat region.

[0005] In some embodiments, the bent structure layer includes a thickened layer, the thickened layer being an integrally formed structure, and the thickness of at least a portion of the thickened layer gradually decreases from the side of the thickened layer closer to the flat region along the side of the thickened layer away from the flat region.

[0006] In some embodiments, the material of the thickened layer includes resin.

[0007] In some embodiments, the bent structural layer includes an adhesive layer disposed between the display structural layer and the cover plate layer, wherein the surface of the adhesive layer away from the display structural layer includes n steps, where n is a natural number greater than or equal to 1, and the thickness of at least a portion of the adhesive layer gradually decreases from the side of the adhesive layer near the flat area along the side of the adhesive layer away from the flat area.

[0008] In some embodiments, the adhesive layer includes at least two adhesive layers stacked sequentially along a direction away from the display structure layer. In two adjacent adhesive layers, the edge of the adhesive layer closer to the display structure layer extends beyond the edge of the adhesive layer away from the display structure layer, forming a step. The edge of the adhesive layer refers to the edge of the adhesive layer away from the flat area.

[0009] In some embodiments, the adhesive layer includes a first adhesive layer, a second adhesive layer, and a third adhesive layer stacked sequentially along a direction away from the display structure layer, wherein the edge of the first adhesive layer extends beyond the edge of the second adhesive layer to form a first step; and the edge of the second adhesive layer extends beyond the edge of the third adhesive layer to form a second step.

[0010] In some embodiments, the distance between the edge of the first adhesive layer and the edge of the second adhesive layer is greater than or equal to 0.1 mm and less than or equal to 1 mm; the distance between the edge of the second adhesive layer and the edge of the third adhesive layer is greater than or equal to 0.1 mm and less than or equal to 1 mm.

[0011] In some embodiments, the adhesive layer is made of optical adhesive; or, the adhesive layer is made of thermosensitive adhesive, wherein the modulus of the thermosensitive adhesive is greater than or equal to 1 MPa at a temperature greater than or equal to 15 degrees and less than or equal to 25 degrees Celsius, the modulus of the thermosensitive adhesive is greater than or equal to 0.5 MPa and less than or equal to 1 MPa at a temperature greater than or equal to 50 degrees Celsius and less than or equal to 70 degrees Celsius, and the modulus of the thermosensitive adhesive is greater than or equal to 0.03 MPa and less than or equal to 0.2 MPa at a temperature greater than or equal to 120 degrees Celsius and less than or equal to 170 degrees Celsius.

[0012] In some embodiments, at least one reinforcing rib is also included, the at least one reinforcing rib being located in the at least one corner region; in a direction perpendicular to the flat region, the display structure layer includes a display layer and a cleanroom foam layer disposed on the side of the display layer away from the cover layer, the at least one reinforcing rib being located in the same film layer as the cleanroom foam layer.

[0013] In some embodiments, the thickness of the at least one reinforcing rib is greater than or equal to 0.1 mm and less than or equal to 0.5 mm, and the width of the at least one reinforcing rib is greater than or equal to 0.2 mm and less than or equal to 1 mm; the number of the at least one reinforcing rib is multiple, and the multiple reinforcing ribs are arranged at intervals along a direction away from the flat area, with the spacing between adjacent reinforcing ribs being greater than or equal to 0.5 mm and less than or equal to 3 mm.

[0014] This application also provides a display device, including the display module described above.

[0015] The present invention discloses an embodiment in which the thickness of the bending structure layer of the display module gradually decreases from the side of the bending structure layer closer to the flat area to the side of the bending structure layer farther away from the flat area, thereby reducing the bending depth of the display structure layer in the corner area of ​​the display module and improving the wrinkles of the display structure layer in the corner area.

[0016] The embodiments disclosed herein show that the thickness of the thickened layer gradually decreases from the side of the thickened layer closer to the flat area to the side of the thickened layer farther away from the flat area, thereby reducing the bending depth of the display structure layer in the corner area of ​​the display module and improving the wrinkles of the display structure layer in the corner area.

[0017] The present invention discloses an embodiment of the display module comprising at least two adhesive layers in an adhesive layer. In two adjacent adhesive layers, the edge of the adhesive layer located near the display structure layer extends beyond the edge of the adhesive layer located away from the display structure layer, forming a step. This causes the thickness of the adhesive layer in the corner region to gradually decrease from the side near the flat region to the side away from the flat region, thereby reducing the bending depth of the display structure layer in the corner region of the display module and improving the wrinkles of the display structure layer in the corner region.

[0018] This disclosure shows that by setting at least one reinforcing rib in the corner area, the modulus of the display structure layer in the corner area is increased, thereby reducing the risk of wrinkles in the corner area of ​​the display module.

[0019] Other features and advantages of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the application. Other advantages of this application can be realized and obtained by means of the embodiments described in the description and the accompanying drawings. Attached Figure Description

[0020] The accompanying drawings are used to provide an understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0021] Figure 1 This is a schematic diagram of the unfolded form of a display module; Figure 2This is a schematic diagram of the bending shape of a display module; Figure 3 A schematic cross-sectional view of the corner area of ​​a display module; Figure 4a This is a cross-sectional structural diagram of a corner area of ​​a display module provided in an embodiment of the present disclosure; Figure 4b This is a cross-sectional structural diagram of a display module's display structure layer provided in an embodiment of the present disclosure; Figure 5a This is a schematic diagram of the simulation experiment of the relevant display module; Figure 5b This is a schematic diagram of a simulation experiment of the display module according to an embodiment of the present disclosure; Figure 6 This is a cross-sectional structural diagram of the corner area of ​​another display module provided in an embodiment of the present disclosure; Figure 7 This is a schematic diagram of another planar structure of a display module provided in an embodiment of the present disclosure; Figure 8 A cross-sectional structural diagram of the adhesive layer in the corner area of ​​another display module provided in this embodiment of the present disclosure; Figure 9 A cross-sectional structural diagram of the corner area of ​​another display module provided in this embodiment of the present disclosure; Figure 10 This is a schematic diagram of another planar structure of a display module provided in an embodiment of the present disclosure; Figure 11 This is a cross-sectional structural diagram of the corner area of ​​another display module provided in an embodiment of the present disclosure. Detailed Implementation

[0022] This application describes several embodiments, but these descriptions are exemplary and not limiting, and it will be apparent to those skilled in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with, or may replace, any feature or element of any other embodiment.

[0023] This application includes and contemplates combinations of features and elements known to those skilled in the art. The embodiments, features, and elements disclosed in this application can also be combined with any conventional features or elements to form unique inventive solutions. Any feature or element of any embodiment can also be combined with features or elements from other inventive solutions to form another unique inventive solution. Therefore, it should be understood that any feature shown and / or discussed in this application can be implemented individually or in any suitable combination. Therefore, the embodiments are not limited except by the limitations imposed by the appended claims and their equivalents. Furthermore, various modifications and changes can be made within the scope of the appended claims.

[0024] Furthermore, in describing representative embodiments, the specification may have presented methods and / or processes as a specific sequence of steps. However, the method or process should not be limited to the specific order of steps described herein, to the extent that it does not depend on such a specific order. As will be understood by those skilled in the art, other sequences of steps are also possible. Therefore, the specific order of steps set forth in the specification should not be construed as a limitation of the claims. Moreover, the claims concerning the method and / or process should not be limited to the steps performed in the written order, and those skilled in the art will readily understand that these orders can be varied and still remain within the spirit and scope of the embodiments of this application.

[0025] Figure 1 This is a schematic diagram of the unfolded form of a display module; Figure 2 This is a schematic diagram of the bending shape of a display module. Taking a four-curved surface display module as an example... Figure 1 and Figure 2As shown, the display module includes a flat area 100 and a curved area 200 surrounding the flat area 100. The curved area 200 bends towards the backlight side of the flat area 100 to form a curved surface. The curved area 200 includes a first side area 11, a second side area 12, a third side area 13, a fourth side area 14, and a first corner area 15, a second corner area 16, a third corner area 17, and a fourth corner area 18. The first side region 11 and the second side region 12 are located on opposite sides of the flat region 100 in the first direction X, and the third side region 13 and the fourth side region 14 are located on opposite sides of the flat region 100 in the second direction Y; the first corner region 15 is disposed between the first side region 11 and the third side region 13, the first end of the first corner region 15 is connected to the first end of the first side region 11, and the second end of the first corner region 15 is connected to the first end of the third side region 13; the second corner region 16 is disposed between the first side region 11 and the fourth side region 14, and the first end of the second corner region 16 is connected to the first side region 13. The second end of the first side region 11 is connected to the second corner region 16, and the second end of the second corner region 16 is connected to the first end of the fourth side region 14. The third corner region 17 is located between the second side region 12 and the third side region 13, with the first end of the third corner region 17 connected to the first end of the second side region 12 and the second end of the third corner region 17 connected to the second end of the third side region 13. The fourth corner region 18 is located between the second side region 12 and the fourth side region 14, with the first end of the fourth corner region 18 connected to the second end of the second side region 12 and the second end of the fourth corner region 18 connected to the second end of the fourth side region 14. In the direction perpendicular to the flat region 100, the first side region 11, the second side region 12, the third side region 13, and the fourth side region 14 all bend towards the backlight side of the flat region 100, forming four curved surfaces. The two sides of any one of the corners in the first corner region 15, the second corner region 16, the third corner region 17, and the fourth corner region 18 are bent, thus forming a double-fold region S. Within the double-fold region S, the display structure layer in the display module is subjected to significant compressive stress, which can easily lead to wrinkles and defects. The first direction X and the second direction Y intersect each other; for example, the first direction X and the second direction Y are perpendicular to each other.

[0026] Figure 3 This is a schematic cross-sectional view of a corner area of ​​a display module. Figure 3 The diagram illustrates the cross-sectional structure of the first corner area of ​​the display module. (Example) Figure 3 As shown, in the plane perpendicular to the flat area of ​​the display module, the first corner area 15' of the display module includes a display structure layer 20' and a cover plate layer 30' disposed on the display structure layer 20'.

[0027] Through research conducted by the inventors of this application, it was discovered that in the corner area of ​​the display module (e.g., the first corner area 15'), the bending depth H' of the display structure layer 20' is approximately the same as the bending depth of the cover plate layer 30'. For example, if the bending depth H' of the display structure layer 20' is greater than or equal to 0.7 mm, it results in an excessively large bending depth H', causing severe wrinkles in the display structure layer 20' and affecting the display effect of the display module. Here, the bending depth H' refers to the dimension in the corner area between the edge of the display structure layer 20' on the side away from the cover plate layer 30' that is closer to the flat area 100' and the edge on the side away from the flat area 100', in the direction perpendicular to the plane containing the flat area of ​​the display module.

[0028] This application provides a display module, including a flat area and a bent area disposed on at least one side of the flat area, the bent area including at least one corner area; The display module includes: The display structure layer is located in the flat area and the at least one corner area; A cover plate layer is located in the flat area and the at least one corner area, and is disposed on one side of the display structure layer; A bent structural layer is located in the at least one corner region and disposed between the display structural layer and the cover plate layer; the thickness of at least a portion of the bent structural layer gradually decreases from the side of the bent structural layer closer to the flat region along the side of the bent structural layer away from the flat region.

[0029] Figure 4a This is a cross-sectional structural diagram of a corner region of a display module provided in an embodiment of this disclosure. Figure 4a The diagram illustrates the cross-sectional structure of the first corner area of ​​the display module. Figure 4a It can be Figure 1 A sectional view along the A-A' direction. (Example) Figure 4aAs shown, in a plane perpendicular to the flat area of ​​the display module, the display module of this embodiment may include a display structure layer 20, a cover layer 30 disposed on the light-emitting side of the display structure layer 20, and a bent structure layer 40 disposed between the display structure layer 20 and the cover layer 30. The display structure layer 20 is located in the flat area 100 of the display module, and at least one of a first corner area 15, a second corner area 16, a third corner area 17, and a fourth corner area 18. The display structure layer 20 includes at least a light-emitting device configured to emit light. The cover layer 30 is located in the flat area 100 of the display module, and at least one of the first corner area 15, the second corner area 16, the third corner area 17, and the fourth corner area 18. The cover layer 30 is disposed on the light-emitting side of the display structure layer 20 and configured to protect the display structure layer 20. For example, the material of the cover layer 30 may include glass. The bent structural layer 40 is located at least in at least one of the first corner region 15, the second corner region 16, the third corner region 17, and the fourth corner region 18, and is disposed between the display structural layer 20 and the cover plate layer 30. The thickness h of at least a portion of the bent structural layer 40 gradually decreases from the side of the bent structural layer 40 near the flat region 100 to the side of the bent structural layer 40 away from the flat region 100. The bent structural layer 40 is configured to reduce the bending depth H of the display structural layer 20 in the corner region of the display module, thereby improving the wrinkles of the display structural layer 20 in the corner region. The bending depth H refers to the dimension of the edge of the surface of the display structural layer 20 on the side away from the cover plate layer 30 near the flat region and the edge on the side away from the flat region in the direction perpendicular to the plane of the flat region of the display module in the corner region.

[0030] In some embodiments, the bent structural layer 40 may include a thickened layer 41, which is a one-piece molded structure and is formed in an arc shape, bent towards the backlight side of the display module. The material of the thickened layer 41 may include a resin, for example, at least one of polymethyl methacrylate (PMMA) and polyethylene terephthalate (PET). The thickened layer 41 has a transmittance of more than 95% for visible light.

[0031] In some embodiments, the structure of the corner region of the display module is illustrated using the first corner region 15 as an example. In the direction perpendicular to the flat region 100 of the display module, and in the first corner region 15 of the display module, a thickening layer 41 is provided between the display structure layer 20 and the cover layer 30. The thickening layer 41 includes at least a curved portion 41-1. The curved portion 41-1 includes a first arc surface 41-1-1 and a second arc surface 41-1-2 disposed opposite to each other. The first arc surface 41-1-1 is located on the side of the thickening layer 41 near the cover layer 30 and is connected to the cover layer 30. The second arc surface 41-1-2 is located on the side of the thickening layer 41 near the display structure layer 20 and is connected to the display structure layer 20. Both the first arc surface 41-1-1 and the second arc surface 41-1-2 are curved towards the backlight side of the display module, and the end of the first arc surface 41-1-1-1 away from the flat region 100 is connected to the end of the second arc surface 41-1-2 away from the flat region 100.

[0032] In some embodiments, the thickness h of the curved portion 41-1 gradually decreases from the side of the curved portion 41-1 near the flat region 100 towards the side of the curved portion 41-1 away from the flat region 100, thereby reducing the bending depth H of the display structure layer 20 in the first corner region 15 and improving the wrinkles of the display structure layer 20 in the first corner region 15. Here, the thickness h of the curved portion 41-1 refers to the dimension between the first arc surface 41-1-1 and the corresponding second arc surface 41-1-2 of the curved portion 41-1.

[0033] The bonding process of the thickened layer 41 in the display module according to this embodiment includes: in the corner area of ​​the display module, for example, the first corner area 15, a thickened layer 41 is first formed on the light-emitting side of the display structure layer 20 by injection molding or compression molding; subsequently, the thickened layer 41 is bonded to the cover layer 30 by a thermal bonding process. The bonding temperature between the thickened layer 41 and the cover layer 30 is higher than the glass transition temperature of the thickened layer 41, thereby increasing the bonding strength between the thickened layer 41 and the cover layer 30. This completes the bonding process of the thickened layer 41 in the display module.

[0034] Figure 4b This is a cross-sectional structural diagram of a display structure layer of a display module provided in an embodiment of this disclosure. Figure 4b The display structure layer shown can be Figure 4a The structure layers are displayed in the middle. For example... Figure 4bAs shown, in a plane perpendicular to the flat area of ​​the display module, the display structure layer 20 of the display module in this embodiment may include a display layer 20-1, a polarizer 20-2 disposed on the side of the display layer 20-1 near the cover layer 30, a back film 20-3 disposed on the side of the display layer 20-1 away from the cover layer 30, and a clean foam layer 20-4 disposed on the side of the back film 20-3 away from the cover layer 30. The display layer 20-1 is configured to emit light, and a thickening layer 41 is disposed between the polarizer 20-2 and the cover layer 30 of the display structure layer 20.

[0035] Figure 5a This is a schematic diagram of the simulation experiment of the relevant display module; Figure 5b This is a schematic diagram of a simulation experiment of the display module according to an embodiment of this disclosure. Figure 3 The relevant display modules shown were subjected to wrinkle simulation experiments, and the simulation results are as follows: Figure 5a As shown; for Figure 4a The disclosed display module was subjected to a wrinkle simulation experiment, and the simulation results are as follows: Figure 5b As shown. Figure 5a and Figure 5b As shown, a large number of wrinkles appear in the corner area of ​​the display structure layer 20' of the relevant display module. In this embodiment of the present disclosure, the wrinkles in the display structure layer 20 in the display module are reduced. The display module in this embodiment of the present disclosure improves the wrinkles in the corner area of ​​the display structure layer 20 by thickening the layer 41.

[0036] Through research, the inventors of this application discovered that in existing display modules, optical adhesive (OCA) is placed between the display structure layer 20 and the cover plate layer 30 to bond the display structure layer 20 and the cover plate layer 30 together. The optical adhesive (OCA) is generally applied in a single layer, and the thickness of the optical adhesive (OCA) is roughly the same, resulting in severe wrinkles in the corner areas of the display structure layer 20.

[0037] Figure 6 This is a cross-sectional structural diagram of the corner area of ​​another display module provided in an embodiment of the present disclosure; Figure 7 This is a schematic diagram of a planar structure of another display module provided in an embodiment of this disclosure. Figure 6 It can be Figure 7 A sectional view along the B-B' direction. (Example) Figure 6 and Figure 7As shown, the display module of this embodiment includes a display structure layer 20, a cover plate layer 30, and an adhesive layer 42 disposed between the display structure layer 20 and the cover plate layer 30. The adhesive layer 42 is configured to bond the display structure layer 20 and the cover plate layer 30 together. On a plane parallel to the flat region 100, the adhesive layer 42 is located in at least one corner region of the display module and the flat region 100. For example, the adhesive layer 42 is located in the flat region 100 of the display module and a first corner region, a second corner region, a third corner region, and a fourth corner region.

[0038] In some embodiments, in at least one corner region, such as the first corner region 15, the adhesive layer 42 is bent toward the backlight side of the display module. The surface of the adhesive layer 42 away from the display structure layer 20 is arc-shaped and includes n steps, where n is a natural number greater than or equal to 1. The n steps cause the thickness h of the adhesive layer 42 in the first corner region 15 to gradually decrease from the side near the flat region 100 to the side away from the flat region 100, thereby reducing the bending depth of the display structure layer 20 in the corner region of the display module and improving the wrinkles of the display structure layer 20 in the corner region.

[0039] In some implementations, n is a natural number greater than or equal to 2, for example, n is a natural number such as 2, 3, 4, 5, etc. The nth step in the adhesive layer 42 is located on the side away from the flat area 100 of the (n+1)th step, so that the thickness h of the adhesive layer 42 gradually decreases from the side close to the flat area 100 to the side away from the flat area 100.

[0040] In some embodiments, the adhesive layer 42 comprises at least two adhesive layers, both disposed between the display structure layer 20 and the cover plate layer 30, and stacked sequentially along a direction away from the display structure layer 20. In adjacent adhesive layers, the edge of the adhesive layer closer to the display structure layer 20 extends beyond the edge of the adhesive layer away from the display structure layer 20, forming a step. This causes the thickness h of the adhesive layer 42 in the first corner region 15 to gradually decrease from the side closer to the flat region 100 along the side away from the flat region 100. The edge of the adhesive layer refers to the edge of the adhesive layer away from the flat region.

[0041] Figure 8 This is a cross-sectional structural diagram of the adhesive layer in the corner region of another display module provided in an embodiment of this disclosure. Figure 8 The adhesive layer shown can be Figure 6 The diagram shows a cross-sectional structure of the adhesive layer in the module. In some embodiments, such as... Figure 7 and Figure 8As shown, the adhesive layer 42 includes a first adhesive layer 42-1, a second adhesive layer 42-2, and a third adhesive layer 42-3 sequentially stacked along a direction away from the display structure layer 20. The first adhesive layer 42-1, the second adhesive layer 42-2, and the third adhesive layer 42-3 are all located in the flat area 100 of the display module and at least one corner area. In at least one corner area of ​​the display module, such as the first corner area 15, the edge of the first adhesive layer 42-1 extends beyond the edge of the second adhesive layer 42-2, forming a first-level step, which is arc-shaped. The edge of the second adhesive layer 42-2 extends beyond the edge of the third adhesive layer 42-3, forming a second-level step, which is also arc-shaped. The second-level step is located on the side of the first-level step closer to the flat area 100, and the two are connected to each other.

[0042] In some embodiments, the distance d1 between the edge of the first adhesive layer 42-1 and the edge of the second adhesive layer 42-2 is greater than or equal to 0.1 mm and less than or equal to 1 mm; the distance d2 between the edge of the second adhesive layer 42-2 and the edge of the third adhesive layer 42-3 is greater than or equal to 0.1 mm and less than or equal to 1 mm.

[0043] This embodiment of the display module shows that the edge of the first adhesive layer 42-1 extends beyond the edge of the second adhesive layer 42-2 to form a first step, and the edge of the second adhesive layer 42-2 extends beyond the edge of the third adhesive layer 42-3 to form a second step. This causes the thickness h of the adhesive layer 42 in the corner region to gradually decrease from the side closer to the flat region 100 to the side farther away from the flat region 100, thereby reducing the bending depth of the display structure layer 20 in the corner region of the display module and improving the wrinkles of the display structure layer 20 in the corner region.

[0044] In some embodiments, the material of the adhesive layer 42 may include optical adhesive (OCA). For example, the materials of the first adhesive layer 42-1, the second adhesive layer 42-2, and the third adhesive layer 42-3 of the adhesive layer 42 may all include optical adhesive (OCA). The optical adhesive (OCA) has a transmittance of visible light greater than or equal to 95%.

[0045] In some embodiments, the material of the adhesive layer 42 may include a thermosensitive adhesive. For example, the materials of the first adhesive layer 42-1, the second adhesive layer 42-2, and the third adhesive layer 42-3 of the adhesive layer 42 may all include thermosensitive adhesive. The thermosensitive adhesive has a transmittance of visible light greater than or equal to 95%. At a temperature greater than or equal to 15 degrees Celsius and less than or equal to 25 degrees Celsius, the modulus of the thermosensitive adhesive is greater than or equal to 1 MPa; at a temperature greater than or equal to 50 degrees Celsius and less than or equal to 70 degrees Celsius, the modulus of the thermosensitive adhesive is greater than or equal to 0.5 MPa and less than or equal to 1 MPa; and at a temperature greater than or equal to 120 degrees Celsius and less than or equal to 170 degrees Celsius, the modulus of the thermosensitive adhesive is greater than or equal to 0.03 MPa and less than or equal to 0.2 MPa.

[0046] Through research by the inventors of this publication, it has been discovered that one reason for wrinkles appearing in the corner areas of the display module is due to instability, according to the instability formula: Among them, E f To show the modulus of structural layer 20, E a h is the modulus of adhesive layer 42. f To show the thickness of structural layer 20, h a The thickness of the adhesive layer 42 is given.

[0047] As can be seen from the above analysis, the material of the adhesive layer 42 of the display module may include thermal adhesive, which increases the modulus of the adhesive layer 42 in the corner area of ​​the display module, thereby reducing the instability load in the corner area of ​​the display module and reducing the risk of wrinkling in the corner area.

[0048] The bonding process of the thermal adhesive in the display module according to this embodiment includes: firstly, bonding the display layer of the display structure layer 20 to the polarizer; then, bonding the thermal adhesive to the polarizer of the display structure layer 20 at a temperature of 60°C for approximately 1 to 3 seconds. Due to the short bonding time, the heat generated during the bonding process will not affect the polarizer; subsequently, bonding the cover layer 30 to the thermal adhesive on the display structure layer 20 at a temperature of 150°C to 200°C for approximately 1 to 3 seconds. Due to the short bonding time, the thermal adhesive does not melt completely; only the portion of the thermal adhesive near the cover layer 30 melts, thereby bonding the thermal adhesive to the cover layer 30 together. This prevents the heat generated during the bonding process from being transferred to the display structure layer 20, and the heat has no effect on the display structure layer 20. During the bonding process between the cover layer 30 and the thermal adhesive, the high modulus of the thermal adhesive reduces the risk of wrinkles in the corner areas.

[0049] Wrinkle simulation experiments were conducted on display modules with adhesive layer 42 comprising optical adhesive and display modules with adhesive layer 42 comprising thermal adhesive, respectively. The modulus of the optical adhesive was 0.2 MPa, and the modulus of the thermal adhesive was 5 MPa. The simulation results showed that the display module with adhesive layer 42 comprising optical adhesive exhibited wrinkles, while the display module with adhesive layer 42 comprising thermal adhesive did not exhibit wrinkles.

[0050] As can be seen from the above analysis, the material of the adhesive layer 42 of the module may include heat-sensitive adhesive, which can reduce the risk of wrinkles in the corner area.

[0051] Figure 9 This is a cross-sectional structural diagram of the corner area of ​​another display module provided in an embodiment of the present disclosure. Figure 10 This is a schematic diagram of a planar structure of another display module provided in an embodiment of the present disclosure. Figure 9 The diagram illustrates the cross-sectional structure of the first corner area of ​​the display module. Figure 9 It can be Figure 10 A sectional view along the C-C' direction. (e.g.) Figure 9 and Figure 10 As shown, the display module of this embodiment includes a display structure layer 20, a cover layer 30, and an adhesive layer 42 disposed between the display structure layer 20 and the cover layer 30. In at least one corner region of the display module, the adhesive layer 42 is bent toward the backlight side of the display module and has a substantially uniform thickness. The display structure layer 20 includes a display layer 20-1, a polarizer 20-2 disposed on the side of the display layer 20-1 near the cover layer 30, a back film 20-3 disposed on the side of the display layer 20-1 away from the cover layer 30, and a clean foam layer 20-4 disposed on the side of the back film 20-3 away from the cover layer 30. The display layer 20-1 is configured to emit light, and the adhesive layer 42 is disposed between the polarizer 20-2 and the cover layer 30 of the display structure layer 20.

[0052] In some embodiments, in at least one corner area of ​​the display module, such as the first corner area 15, the display module further includes at least one reinforcing rib 43. The at least one reinforcing rib 43 is disposed on the side of the display layer 20-1 away from the cover plate layer 30. The at least one reinforcing rib 43 may be located in the same film layer as the ultra-clean foam layer 20-4. For example, at least one strip groove is provided in the ultra-clean foam layer 20-4, and at least one reinforcing rib 43 is disposed corresponding to at least one strip groove. The at least one reinforcing rib 43 is disposed in the corresponding strip groove.

[0053] In some embodiments, the structure of the reinforcing ribs 43 in the corner region is illustrated using the first corner region 15 of the display module as an example. In the first corner region 15 of the display module, the display module includes a plurality of reinforcing ribs 43. The plurality of reinforcing ribs 43 are arc-shaped and extend along the outer or inner contour of the first corner region 15. The plurality of reinforcing ribs 43 may be spaced apart along a direction away from the flat region 100 of the display module. The thickness of the plurality of reinforcing ribs 43 is greater than or equal to 0.1 mm and less than or equal to 0.5 mm, and the width of the plurality of reinforcing ribs 43 is greater than or equal to 0.2 mm and less than or equal to 1 mm; the spacing between adjacent reinforcing ribs 43 is greater than or equal to 0.5 mm and less than or equal to 3 mm. The material of the plurality of reinforcing ribs 43 may include metal, for example, stainless steel (SUS). The modulus of the plurality of reinforcing ribs 43 may be greater than or equal to 170 GPa and less than or equal to 200 GPa.

[0054] This disclosure shows that by providing at least one reinforcing rib 43 in the corner area, the modulus of the display structure layer 20 in the corner area is increased, thereby reducing the risk of wrinkles in the corner area of ​​the display module.

[0055] Figure 11This is a cross-sectional structural diagram of the corner region of another display module provided in an embodiment of this disclosure. Figure 11 The diagram illustrates the cross-sectional structure of the first corner area of ​​the display module. (Example) Figure 11 As shown in the embodiments of this disclosure, the main structure of the module is similar to... Figure 9 The main structure of the display module shown is largely the same as that of the other two, except that the display module in this embodiment includes a display structure layer 20, a bent structure layer 40 disposed on the display structure layer 20, and a cover plate layer 30 disposed on the side of the bent structure layer 40 away from the display structure layer 20. The structures of the display structure layer 20 and the cover plate layer 30 of the display module in this embodiment are similar to those of the other two. Figure 9 The display structure layer 20 and cover plate layer 30 of the display module shown have substantially the same structure. In this embodiment, the bent structure layer 40 of the display module includes an adhesive layer 42 disposed on the display structure layer 20, and a thickened layer 41 disposed on the side of the adhesive layer 42 away from the display structure layer 20.

[0056] In some embodiments, the thickened layer 41 is a one-piece molded structure, and the thickened layer 41 is formed in an arc shape, bending towards the backlight side of the display module. The material of the thickened layer 41 may include resin, for example, at least one of polymethyl methacrylate (PMMA) and polyethylene terephthalate (PET). The thickened layer 41 has a light transmittance of more than 95% for visible light. The thickened layer 41 includes at least a bent portion 41-1, which includes a first arc surface and a second arc surface disposed opposite to each other. The first arc surface is located on the side of the thickened layer 41 near the cover plate layer 30 and is connected to the cover plate layer 30. The second arc surface is located on the side of the thickened layer 41 near the display structure layer 20 and is connected to the display structure layer 20. Both the first arc surface and the second arc surface are bent towards the backlight side of the display module, and the end of the first arc surface away from the flat area 100 is connected to the end of the second arc surface away from the flat area 100. The thickness of the curved portion 41-1 gradually decreases from the side of the curved portion 41-1 close to the flat area 100 to the side of the curved portion 41-1 away from the flat area 100, thereby reducing the bending depth of the display structure layer 20 in the first corner area 15 and improving the wrinkles of the display structure layer 20 in the first corner area 15.

[0057] In some embodiments, the adhesive layer 42 is bent toward the backlight side of the display module. The surface of the adhesive layer 42 away from the display structure layer 20 is arc-shaped and includes n steps, where n is a natural number greater than or equal to 1. The n steps cause the thickness of the adhesive layer 42 in the first corner region 15 to gradually decrease from the side near the flat region 100 to the side away from the flat region 100, thereby reducing the bending depth of the display structure layer 20 in the corner region of the display module and improving the wrinkles of the display structure layer 20 in the corner region. The adhesive layer 42 includes at least two adhesive layers, both of which are disposed between the display structure layer 20 and the cover plate layer 30, and are stacked sequentially in a direction away from the display structure layer 20. In two adjacent adhesive layers, the edge of the adhesive layer located near the display structure layer 20 extends beyond the edge of the adhesive layer located away from the display structure layer 20, forming a step. For example, the adhesive layer 42 includes a first adhesive layer, a second adhesive layer, and a third adhesive layer sequentially stacked along a direction away from the display structure layer 20. The first, second, and third adhesive layers are all located in the flat area 100 and at least one corner area of ​​the display module. In at least one corner area of ​​the display module, such as the first corner area 15, the edge of the first adhesive layer extends beyond the edge of the second adhesive layer, forming a first step with an arc shape; the edge of the second adhesive layer extends beyond the edge of the third adhesive layer, forming a second step with an arc shape.

[0058] The present invention discloses an embodiment of the display module by bending the structural layer 40 to reduce the bending depth of the display structural layer 20 in the corner area of ​​the display module, thereby improving the wrinkles of the display structural layer 20 in the corner area.

[0059] This disclosure also provides a display device, including the display module of the foregoing embodiments. The display device can be any product or component with display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0060] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, 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, and therefore should not be construed as a limitation of this application.

[0061] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of those features.

[0062] In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

[0063] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0064] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0066] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A display module, characterized in that, It includes a flat area and a bent area disposed on at least one side of the flat area, the bent area including at least one corner area; The display module includes: The display structure layer is located in the flat area and the at least one corner area; A cover plate layer is located in the flat area and the at least one corner area, and is disposed on one side of the display structure layer; A bent structural layer is located in the at least one corner region and disposed between the display structural layer and the cover plate layer; the thickness of at least a portion of the bent structural layer gradually decreases from the side of the bent structural layer closer to the flat region along the side of the bent structural layer away from the flat region.

2. The display module according to claim 1, characterized in that, The bent structure layer includes a thickened layer, which is an integrally formed structure. The thickness of the thickened layer, at least a portion thereof, gradually decreases from the side of the thickened layer closest to the flat area along the side of the thickened layer furthest from the flat area.

3. The display module according to claim 2, characterized in that, The material of the thickened layer includes resin.

4. The display module according to claim 1, characterized in that, The bent structure layer includes an adhesive layer disposed between the display structure layer and the cover plate layer. The surface of the adhesive layer away from the display structure layer includes n steps, where n is a natural number greater than or equal to 1. The thickness of at least a portion of the adhesive layer gradually decreases from the side of the adhesive layer near the flat area along the side of the adhesive layer away from the flat area.

5. The display module according to claim 4, characterized in that, The adhesive layer includes at least two adhesive layers, which are stacked sequentially along a direction away from the display structure layer. In two adjacent adhesive layers, the edge of the adhesive layer located closer to the display structure layer extends beyond the edge of the adhesive layer located away from the display structure layer, forming a step. The edge of the adhesive layer refers to the edge of the adhesive layer located away from the flat area.

6. The display module according to claim 5, characterized in that, The adhesive layer includes a first adhesive layer, a second adhesive layer, and a third adhesive layer stacked sequentially along a direction away from the display structure layer. The edge of the first adhesive layer extends beyond the edge of the second adhesive layer to form a first step; the edge of the second adhesive layer extends beyond the edge of the third adhesive layer to form a second step.

7. The display module according to claim 6, characterized in that, The distance between the edge of the first adhesive layer and the edge of the second adhesive layer is greater than or equal to 0.1 mm and less than or equal to 1 mm; the distance between the edge of the second adhesive layer and the edge of the third adhesive layer is greater than or equal to 0.1 mm and less than or equal to 1 mm.

8. The display module according to claim 4, characterized in that, The adhesive layer is made of optical adhesive; or, the adhesive layer is made of thermosensitive adhesive, wherein the modulus of the thermosensitive adhesive is greater than or equal to 1 MPa at a temperature greater than or equal to 15 degrees and less than or equal to 25 degrees Celsius, the modulus of the thermosensitive adhesive is greater than or equal to 0.5 MPa and less than or equal to 1 MPa at a temperature greater than or equal to 50 degrees Celsius and less than or equal to 70 degrees Celsius, and the modulus of the thermosensitive adhesive is greater than or equal to 0.03 MPa and less than or equal to 0.2 MPa at a temperature greater than or equal to 120 degrees Celsius and less than or equal to 170 degrees Celsius.

9. The display module according to any one of claims 1 to 8, characterized in that, It also includes at least one reinforcing rib located in the at least one corner region; in the direction perpendicular to the flat region, the display structure layer includes a display layer and a clean foam layer disposed on the side of the display layer away from the cover plate layer, and the at least one reinforcing rib and the clean foam layer are located in the same film layer.

10. The display module according to claim 9, characterized in that, The thickness of the at least one reinforcing rib is greater than or equal to 0.1 mm and less than or equal to 0.5 mm, and the width of the at least one reinforcing rib is greater than or equal to 0.2 mm and less than or equal to 1 mm; the number of the at least one reinforcing rib is multiple, and the multiple reinforcing ribs are arranged at intervals along a direction away from the flat area, with the spacing between adjacent reinforcing ribs being greater than or equal to 0.5 mm and less than or equal to 3 mm.

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

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