Display module, back film and display device

Abstract

The utility model provides a display module, a back film and a display device, relates to the technical field of display, and aims to improve the durability of the display module. The display module comprises a display panel, a first bonding layer, a second bonding layer, an ultra-thin glass layer and a supporting layer. The display panel comprises a first part provided with a display area and a second part provided with a fan-out area, the first part comprises a display surface and a non-display surface which are opposite to each other, and the second part is bent to the side close to the non-display surface. The first bonding layer is connected with the non-display surface, the second bonding layer is arranged on the side, close to the first part, of the second part, and the second bonding layer is connected with the second part. The ultra-thin glass layer is arranged on the side, away from the first part, of the first bonding layer and connected with the first bonding layer, and the supporting layer is arranged on the side, close to the first part, of the second bonding layer and connected with the second bonding layer.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a display module, a back film, and a display device. Background Technology

[0002] In foldable organic light-emitting diode (OLED) screens, the display module is prone to permanent deformation (creep) after repeated bending, resulting in obvious creases on the screen and thus reducing the durability of the display panel. Utility Model Content

[0003] This application discloses a display module, a back film, and a display device, aiming to improve the durability of the display module.

[0004] To achieve the above objectives, embodiments of this application provide the following technical solutions:

[0005] On one hand, a display module is provided, comprising a display panel, a first adhesive layer, a second adhesive layer, an ultra-thin glass layer, and a support layer. The display panel includes a first portion having a display area and a second portion having a fan-out area. The first portion includes opposing display and non-display surfaces, and the second portion is bent towards the side closer to the non-display surface. The first adhesive layer is connected to the non-display surface, and the second adhesive layer is disposed on the side of the second portion closer to the first portion and connected to the second portion. The ultra-thin glass layer is disposed on the side of the first adhesive layer away from the first portion and connected to the first adhesive layer. The support layer is disposed on the side of the second adhesive layer closer to the first portion and connected to the second adhesive layer.

[0006] The display module provided in this application includes a display panel, a first adhesive layer, a second adhesive layer, an ultra-thin glass layer, and a support layer. An ultra-thin glass layer is disposed on the non-display side of the first portion of the display panel, and is connected to the non-display side via the first adhesive layer; that is, the ultra-thin glass layer is disposed on the back of the display panel. The second portion of the display panel is bent to the side closer to the non-display side, and the second adhesive layer is connected to the second portion. The support layer is disposed on the side of the second adhesive layer closer to the first portion, and is connected to the second adhesive layer; that is, the support layer is adhered to the second portion via the second adhesive layer. Because the ultra-thin glass layer has excellent bending and impact resistance, by providing an ultra-thin glass layer on the back of the display panel, creases caused by folding the display panel can be effectively reduced, and the impact resistance of the display panel can be improved, thereby increasing the durability of the display module.

[0007] In some embodiments, the first portion includes a first boundary and a second boundary opposite each other along a first direction, and a third boundary and a fourth boundary opposite each other along a second direction, the first direction intersecting the second direction, the third boundary being farther away from the second portion than the fourth boundary. The ultrathin glass layer includes a fifth boundary and a sixth boundary opposite each other along the first direction, and a seventh boundary and an eighth boundary opposite each other along the second direction, the seventh boundary being farther away from the second portion than the eighth boundary. In the first direction, the fifth boundary extends to the outside of the first boundary, and the sixth boundary extends to the outside of the second boundary. In the second direction, the seventh boundary extends to the outside of the third boundary.

[0008] In some embodiments, the junction of the first boundary and the third boundary has a first corner, and the junction of the second boundary and the third boundary has a second corner. The junction of the fifth boundary and the seventh boundary has a third corner, and the junction of the sixth boundary and the seventh boundary has a fourth corner. The outer boundary of the third corner extends beyond the outer boundary of the first corner, and the outer boundary of the fourth corner extends beyond the outer boundary of the second corner.

[0009] In some embodiments, the eighth boundary is flush with the fourth boundary in the first direction.

[0010] In some embodiments, the display panel further includes a light-transmitting hole disposed in the display area. The ultra-thin glass layer includes a through-hole, the outer boundary of which, as projected onto the display panel, extends beyond the outer boundary of the light-transmitting hole.

[0011] In some embodiments, the sum of the thicknesses of the first adhesive layer and the ultrathin glass layer is equal to the sum of the thicknesses of the second adhesive layer and the support layer.

[0012] In some embodiments, the display module further includes a folding support assembly disposed on the side of the ultrathin glass layer away from the first portion and connected to the ultrathin glass layer.

[0013] On the other hand, a back film is provided, comprising a first protective film, a first adhesive layer and a second adhesive layer, a release film, a support layer, and a second protective film. The first adhesive layer and the second adhesive layer are disposed on one side of the first protective film. The release film is disposed on the side of the first adhesive layer away from the first protective film, and the support layer is disposed on the side of the second adhesive layer away from the first protective film. The second protective film covers the release film and the support layer. The thickness of the first adhesive layer is greater than the thickness of the second adhesive layer. The first adhesive layer includes a ninth boundary near the second adhesive layer, and the release film includes a tenth boundary near the support layer, the tenth boundary extending beyond the ninth boundary.

[0014] The backing film provided in this application includes a first protective film, a first adhesive layer and a second adhesive layer, a release film and a support layer, and a second protective film. The first adhesive layer and the release film are disposed between the first protective film and the second protective film, and the second adhesive layer and the support layer. The second protective film covers the release film and the support layer to protect the surfaces of the release film and the support layer.

[0015] Furthermore, the back film is bonded to the target panel via a first adhesive layer and a second adhesive layer. Since the first adhesive layer is thicker than the second adhesive layer, there is a risk of the first adhesive layer overflowing during the back film bonding process. To address this, the ninth boundary (inner boundary) of the release film is set to extend outward relative to the tenth boundary (inner boundary) of the first adhesive layer. Due to the capillary effect of the first adhesive layer, during the back film bonding process, the first adhesive layer will preferentially extend inward along the outward-extending ninth boundary of the release film, thereby preventing overflow of the first adhesive layer during bonding and improving the quality and efficiency of the back film bonding process.

[0016] In some embodiments, the peel force between the first protective film and the first adhesive layer is less than the peel force between the release film and the first adhesive layer. Furthermore, the peel force between the first protective film and the second adhesive layer is less than the peel force between the support layer and the second adhesive layer.

[0017] In another aspect, a display device is provided, which includes the display module in the above embodiments and a controller electrically connected to the display module.

[0018] The above-described display device has the same structure and beneficial technical effects as the display module provided in some of the above embodiments, and will not be described again here. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in some embodiments of this application will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not the actual dimensions of the products involved in the embodiments of this application.

[0020] Figure 1 A structural diagram of the display device provided in the embodiments of this application;

[0021] Figure 2 for Figure 1 A partial sectional view of the display device along section line AA';

[0022] Figure 3 for Figure 1 A magnified view of a portion of the film layer of the display module at point M;

[0023] Figure 4 A structural diagram of the backsheet provided for an embodiment of this application;

[0024] Figure 5 for Figure 4 A top view of part of the back membrane in the middle;

[0025] Figure 6 A flowchart illustrating a method for manufacturing a display module provided in this application;

[0026] Figures 7-18 for Figure 6 The preparation method shown in the diagrams illustrates each step.

[0027] Figure 19 for Figure 6 A step diagram illustrating step S4 of pasting an ultra-thin glass layer;

[0028] Figure 20 for Figure 6 Another step diagram for pasting the ultrathin glass layer in step S4;

[0029] Figure 21 for Figure 6 Another step diagram for pasting the ultrathin glass layer in step S4;

[0030] Figure 22 Flowchart of another method for manufacturing the display module provided in this application;

[0031] Figures 23-24 for Figure 22 The preparation method shown in the diagrams illustrates each step.

[0032] Figure 25 for Figure 22 A step diagram illustrating step S4 of pasting an ultra-thin glass layer;

[0033] Figure 26 for Figure 22 Another step diagram for pasting the ultrathin glass layer in step S4;

[0034] Figure 27 for Figure 22 Another step diagram for pasting the ultrathin glass layer in step S4;

[0035] Figure 28 for Figure 22 Another step diagram for step S4 of the process is shown below, showing how to paste the ultra-thin glass layer. Detailed Implementation

[0036] The technical solutions in some embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application are within the scope of protection of this application.

[0037] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open and encompassing, that is, "including, but not limited to".

[0038] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this application, unless otherwise stated, "a plurality of" means two or more.

[0039] In describing some embodiments, the term "connection" and its derivative expressions may be used. The term "connection" should be interpreted broadly; for example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. For example, in describing some embodiments, the term "connection" may be used to indicate that two or more components have direct physical or electrical contact with each other.

[0040] In addition, the use of “based on” implies openness and inclusivity, because processes, steps, calculations or other actions “based on” one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0041] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can mean that the layer or element is directly on the other layer or substrate, or that there is an intermediate layer between the layer or element and the other layer or substrate.

[0042] This document describes exemplary embodiments with reference to cross-sectional views, which are intended as idealized exemplary drawings. In the drawings, the thickness of the layers and the area of ​​the regions are enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Thus, exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include shape deviations caused, for example, by manufacturing processes. For example, etched areas shown as rectangular would typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the areas of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0043] Embodiments of this application provide a display device 100, Figure 1 This is a structural diagram of a display device provided in an embodiment of this application.

[0044] See Figure 1 The display device 100 includes a display module 10 and a controller 200 electrically connected to the display module. The controller 200 can be located on the non-display side of the display module 10 and is used to control the display panel in the display module 10 to display images.

[0045] The aforementioned display device can be any device that displays images, whether moving (e.g., video) or fixed (e.g., still images), and whether it contains text or images. More specifically, the embodiments described are contemplated to be implemented in or associated with a variety of electronic devices, such as (but not limited to) mobile phones, wireless devices, personal data assistants (PDAs), handheld or portable computers, GPS receivers / navigators, cameras, MP4 video players, camcorders, game consoles, watches, clocks, calculators, television monitors, flat panel displays, computer monitors, automotive displays (e.g., odometer displays, etc.), navigators, cockpit controllers and / or displays, displays of camera views (e.g., displays of rearview cameras in vehicles), electronic photographs, electronic billboards or signs, projectors, architectural structures, packaging and aesthetic structures (e.g., displays of images of a piece of jewelry), etc.

[0046] Embodiments of this application also provide a display module. Figure 2 for Figure 1 A partial sectional view of the display device along section line AA'.

[0047] See Figure 2 The display module 10 includes a display panel 1, a first adhesive layer 21 and a second adhesive layer 22, an ultra-thin glass (UTG) layer 3, and a support layer 4. The display module 10 also includes an optically clear adhesive (OCA) layer 20 disposed on the side of the display panel 1 away from the ultra-thin glass layer 3, and a cover glass layer 5 disposed on the side of the optically clear adhesive layer 20 away from the display panel 1.

[0048] The display panel 1 includes a first part 11 having an active area (AA) and a second part 12 having a fanout area, the second part 12 being located on one side of the first part 11. The first part 11 includes opposing display surfaces 101 and non-display surfaces 102, and the second part 12 is bent to the side closer to the non-display surface 102 of the first part 11.

[0049] The first adhesive layer 21 is connected to the non-display surface 102. The ultra-thin glass layer 3 is disposed on the side of the first adhesive layer 21 away from the first part 11, and the ultra-thin glass layer 3 is connected to the first adhesive layer 21. For example, the material of the first adhesive layer 21 can be pressure-sensitive adhesive (PSA). The ultra-thin glass layer 3 is attached to the non-display surface 102 through the first adhesive layer 21.

[0050] See also Figure 2 The second adhesive layer 22 is disposed on the side of the second part 12 closest to the first part 11, and the second adhesive layer 22 is connected to the second part 12. The support layer 4 is disposed on the side of the second adhesive layer 22 closest to the first part 11, and the support layer 4 is connected to the second adhesive layer 22. For example, the material of the second adhesive layer 22 can be PSA, and the material of the support layer 4 can be polyimide (PI). It is understood that the support layer 4 is adhered to the second part 12 through the second adhesive layer 22.

[0051] The cover glass layer 5 is attached to the display surface 101 of the display panel 1 by the optical adhesive layer 20. The cover glass layer 5 is used to protect the display panel 1.

[0052] The display module 10 provided in this application includes a display panel 1, a first adhesive layer 21, a second adhesive layer 22, an ultra-thin glass layer 3, and a support layer 4. An ultra-thin glass layer 3 is disposed on one side of the non-display surface 102 of the first portion 11 of the display panel 1. The ultra-thin glass layer 3 is connected to the non-display surface 102 via the first adhesive layer 21, meaning the ultra-thin glass layer 3 is disposed on the back side of the display panel 1. The second portion 12 of the display panel 1 is bent to the side near the non-display surface 102, and the second adhesive layer 22 is connected to the second portion 12. The support layer 4 is disposed on the side of the second adhesive layer 22 near the first portion 11, and is connected to the second adhesive layer 22, meaning the support layer 4 is adhered to the second portion 12 via the second adhesive layer 22. Because the ultra-thin glass layer 3 has excellent bending performance and impact resistance, by providing an ultra-thin glass layer 3 on the back side of the display panel 1, creases caused by folding the display panel 1 can be effectively reduced, and the impact resistance of the display panel 1 can be improved, thereby increasing the durability of the display module 10.

[0053] In some embodiments, see Figure 2 The display module 10 also includes a folding support assembly 6, which is disposed on the side of the ultra-thin glass layer 3 away from the first part 11 and connected to the ultra-thin glass layer 3. The folding support assembly 6 and the ultra-thin glass layer 3 together support the first part 11 to improve the impact resistance of the display panel 1. Furthermore, the folding support assembly 6 also has good bending performance, enabling the display module 10 to achieve a folding function.

[0054] In some embodiments, see Figure 2 The sum of the thicknesses d1 of the first adhesive layer 21 and the ultra-thin glass layer 3 is equal to the sum of the thicknesses d2 of the second adhesive layer 22 and the support layer 4. Before the second part 12 is bent, the stacked film layers of the first adhesive layer 21 and the ultra-thin glass layer 3 and the stacked film layers of the second adhesive layer 22 and the support layer 4 need to be synchronously bonded to the back of the display panel 1. By setting d1=d2, the thicknesses of the two stacked film layers are made consistent, thereby ensuring the flatness of the film layer bonding.

[0055] For example, d1 and d2 can be set to 65 μm, wherein the thickness of the first adhesive layer 21 is 35 μm, the thickness of the ultrathin glass layer 3 is 30 μm, the thickness of the second adhesive layer 22 is 15 μm, and the thickness of the support layer 4 is 50 μm.

[0056] Figure 3 for Figure 1 The image shows a magnified view of a portion of the film layer of the display module at point M.

[0057] In some embodiments, see Figure 1 and Figure 3 The first part 11 of the display panel 1 includes a first boundary (left boundary) A1 and a second boundary (right boundary) A2 opposite each other along a first direction X, and a third boundary A3 and a fourth boundary A4 opposite each other along a second direction Y. The first direction X intersects the second direction Y, and exemplarily, the first direction X is perpendicular to the second direction Y. The third boundary A3 is farther away from the second part 12 than the fourth boundary A4, that is, along the direction Y, the third boundary A3 (upper boundary) is above the fourth boundary (lower boundary) A4.

[0058] The ultrathin glass layer 3 includes a fifth boundary (left boundary) A5 and a sixth boundary (right boundary) A6 opposite each other along the first direction X, and a seventh boundary A7 and an eighth boundary A8 opposite each other along the second direction Y. The seventh boundary A7 is farther away from the second part 22 than the eighth boundary A8, that is, along the direction Y, the seventh boundary (upper boundary) A7 is above the eighth boundary (lower boundary) A8.

[0059] See also Figure 1 and Figure 3 In the first direction X, the fifth boundary A5 extends beyond the outside of the first boundary A1, and the sixth boundary A6 extends beyond the outside of the second boundary A2, meaning that the left and right boundaries of the ultrathin glass layer 3 both extend beyond the left and right boundaries of the first part 11. In the second direction Y, the seventh boundary A7 extends beyond the outside of the third boundary A3, meaning that the upper boundary of the ultrathin glass layer 3 extends beyond the upper boundary of the first part 11. For example, the left, right, and upper boundaries of the ultrathin glass layer 3 extend beyond the left, right, and upper boundaries of the first part 11 by at least 0.1 mm, respectively.

[0060] By setting the left, right, and top boundaries of the ultra-thin glass layer 3 to extend beyond the left, right, and top boundaries of the first part 11, the ultra-thin glass layer 3 effectively supports the display module 10. Furthermore, a certain margin is left in the size and position of the first part 11 of the display panel 1 to reduce the difficulty of bonding the ultra-thin glass layer 3 and the first part 11.

[0061] In some embodiments, see Figure 1 and Figure 3 The first boundary A1 and the third boundary A3 have a first corner (upper left corner) B1 at their connection; the second boundary A2 and the third boundary A4 have a second corner (upper right corner) B2 at their connection; the fifth boundary A5 and the seventh boundary A7 have a third corner (upper left corner) B3 at their connection; and the sixth boundary A6 and the seventh boundary A7 have a fourth corner (upper right corner) B4 at their connection.

[0062] For example, the first corner B1, the second corner B2, the third corner B3 and the fourth corner B4 can all be rounded corners, or they can all be right angles, or they can be other shapes. The embodiments of this application do not limit this. Figure 3 The diagram shows the case where the first corner B1, the second corner B2, the third corner B3, and the fourth corner B4 are all rounded.

[0063] The outer boundary of the third corner B3 extends beyond the outer boundary of the first corner B1, and the outer boundary of the fourth corner B4 extends beyond the outer boundary of the second corner B2. That is, the upper left and upper right corners of the ultra-thin glass layer 3 extend beyond the upper left and upper right corners of the first part 11, respectively. This corner setting of the ultra-thin glass layer 3 allows for a certain margin in the size and position setting of the first part 11 of the display panel 1, thereby improving the bonding accuracy between the ultra-thin glass layer 3 and the first part 11. For example, the outer boundaries of the upper left and upper right corners of the ultra-thin glass layer 3 extend beyond the outer boundaries of the upper left and upper right corners of the first part 11 by at least 0.1 mm, respectively.

[0064] In some embodiments, see Figure 1 and Figure 3 In the first direction (direction X), the eighth boundary A8 is flush with the fourth boundary A4, that is, the boundary of the ultra-thin glass layer 3 does not extend beyond the side of the first part 11 near the second part 12, so as to facilitate the wiring setup here, and to facilitate the second part 12 to bend to the non-display surface 102.

[0065] In some embodiments, see Figure 1 and Figure 3The display panel 1 also includes a light-transmitting hole 103 disposed in the display area. The ultra-thin glass layer 3 includes a through hole 30, the outer boundary of the orthographic projection of the through hole 30 on the display panel 1 extends beyond the outer boundary of the light-transmitting hole 103, so that the through hole 30 can completely expose the light-transmitting hole 103, and avoid the ultra-thin glass layer 3 from blocking the light.

[0066] For example, the through hole 30 and the light-transmitting hole 103 can be circular in shape, and the outer boundary of the orthographic projection of the through hole 30 on the display panel 1 extends beyond the outer boundary of the light-transmitting hole 103 by at least 0.1 mm. By setting the outer boundary of the through hole 30 to extend beyond the outer boundary of the light-transmitting hole 103, a certain margin is provided for the alignment of the through hole 30 and the light-transmitting hole 103, and the bonding difficulty between the ultra-thin glass layer 3 and the first part 11 is reduced.

[0067] On the other hand, this application also provides a backing film. Figure 4 A structural diagram of the backsheet provided for an embodiment of this application.

[0068] See Figure 4 The back film 7 includes a first protective film 71, a first adhesive layer 21, a second adhesive layer 22, a release film 70, a support layer 4, and a second protective film 72.

[0069] The first adhesive layer 21 and the second adhesive layer 22 are disposed on one side of the first protective film 71. For example, the materials of the first adhesive layer 21 and the second adhesive layer 22 can be PAS. The release film 70 is disposed on the side of the first adhesive layer 21 away from the first protective film 71, and the support layer 4 is disposed on the side of the second adhesive layer 22 away from the first protective film 71. For example, the material of the support layer 4 can be PI. The second protective film 72 covers the release film 70 and the support layer 4. The first protective film 71 and the second protective film 72 are used to protect the surfaces of the first adhesive layer 21, the second adhesive layer 22, the release film 70, and the support layer 4 from contamination or damage.

[0070] The sum of the thicknesses of the first adhesive layer 21 and the release film 70 is equal to the sum of the thicknesses of the second adhesive layer 22 and the support layer 4. This ensures the consistency of the total thickness of the stacked film layers in the back film 7, guaranteeing its flatness during lamination. To accommodate the thickness of the release film 70, the thickness of the first adhesive layer 21 is set to be greater than the thickness of the second adhesive layer 22. The back film 7 is laminated to the target panel via the first adhesive layer 21 and the second adhesive layer 22. Because the first adhesive layer 21 is thicker than the second adhesive layer 22, there is a risk of the first adhesive layer 21 overflowing during the lamination process.

[0071] See also Figure 4The first adhesive layer 21 includes a ninth boundary (inner boundary) A9 near the second adhesive layer 22, and the release film 70 includes a tenth boundary (inner boundary) A10 near the support layer 4. The tenth boundary A10 extends to the outside of the ninth boundary A9. It is understood that the inner boundary of the release film 70 extends outward relative to the inner boundary of the first adhesive layer 21.

[0072] The backing film 7 provided in this application includes a first protective film 71, a first adhesive layer 21 and a second adhesive layer 22, a release film 70, a support layer 4, and a second protective film 72. The first adhesive layer 21 and the release film 70 are disposed between the first protective film 71 and the second protective film 72, along with the second adhesive layer 22 and the support layer 4. The second protective film 72 covers the release film 70 and the support layer 4 to protect the surfaces of the release film 70 and the support layer 4.

[0073] Furthermore, the back film 7 is bonded to the target panel via the first adhesive layer 21 and the second adhesive layer 22. Since the thickness of the first adhesive layer 21 is greater than that of the second adhesive layer 22, there is a risk of the first adhesive layer 21 overflowing during the bonding process of the back film 7. The ninth boundary (inner boundary) A9 of the release film 70 is set to extend outward relative to the tenth boundary (inner boundary) A10 of the first adhesive layer 21. Due to the capillary effect of the first adhesive layer 21, during the bonding process of the back film 7, the first adhesive layer 21 will preferentially extend inward along the outwardly extending ninth boundary A9 of the release film 70, thereby preventing the first adhesive layer 21 from overflowing during the bonding process, and thus improving the quality and efficiency of the back film 7 bonding process.

[0074] For example, during the use of the back film 7, after the release film 70 is removed, a support material such as UTG can be set at the location where the release film 70 is set to enhance the support and impact resistance of the back film 7. The thickness of the release film 70 is different from the thickness of the support layer 4, which can better adapt to the thickness of the UTG.

[0075] Figure 5 for Figure 4 A top view of part of the back membrane in the image.

[0076] For example, see Figure 4 and Figure 5 The release film 70 includes alignment marks 700, which are disposed around the perimeter of the release film 70. For example, the alignment marks 700 can be disposed at the four corners of the release film 70. During the bonding process between the back film 7 and the target panel, the alignment marks 700 are gripped to achieve precise bonding between the back film 7 and the target panel, avoiding direct contact between the gripping device and the first adhesive layer 21, thereby reducing the risk of difficulty in edge gripping.

[0077] Furthermore, due to the outward expansion of the inner boundary (ninth boundary) A9 of the release film 70, the overflow of the first adhesive layer 21 during the bonding process is avoided, thereby preventing contamination of the feature points of the target panel and improving the accuracy of the bonding equipment in recognizing and aligning the aforementioned feature points.

[0078] In some embodiments, see Figure 4 The peel force between the first protective film 71 and the first adhesive layer 21 is less than the peel force between the release film 70 and the first adhesive layer 21. For example, the peel force between the first protective film 71 and the first adhesive layer 21 can be 0-2 gf / inch ("gf / inch" is the unit of peel force, which is "grams per inch"), and the peel force between the release film 70 and the first adhesive layer 21 can be 2-4 gf / inch. Furthermore, the peel force between the first protective film 71 and the second adhesive layer 22 is less than the peel force between the support layer 4 and the second adhesive layer 22. For example, the peel force between the first protective film 71 and the second adhesive layer 22 can be 0-2 gf / inch, and the peel force between the support layer 4 and the second adhesive layer 22 can be 1000 gf / inch.

[0079] During the bonding process of the back film 7, the first protective film 71 needs to be removed first, followed by the second protective film 22 and the release film 70. By setting the peel force between the release film 70 and the first adhesive layer 21 to be greater than that between the first protective film 71 and the first adhesive layer 21, the problem of reverse release will not occur during the process of removing the first protective film 71, that is, the release film 70 will not be accidentally lifted, thereby ensuring the smooth progress of the bonding process.

[0080] On the other hand, embodiments of this application also provide a method for manufacturing a display module. Figure 6 A flowchart illustrating a method for manufacturing a display module provided in this application; Figures 7-18 for Figure 6 The preparation method is illustrated with diagrams of each step. Among them, Figure 8 , Figure 10 , Figure 12 , Figure 14 , Figure 16 , Figure 18 They are respectively Figure 7 , Figure 9 , Figure 11 , Figure 13 , Figure 15 , Figure 17 The display module is shown in a partial sectional view along section line BB'.

[0081] See Figure 6 The preparation method includes the following steps S1 to S5:

[0082] Step S1: See Figure 7 and Figure 8The display panel 1 is provided, which includes a first surface 101 and a second surface 102 opposite to each other. The display panel 1 also includes a first part 11 with a display area and a second part 12 with a fan-out area.

[0083] Step S2: See Figure 9 and Figure 10 The back film 7 is attached to the second surface 102. The back film 7 includes a first adhesive layer 21 connected to the first part 11, a second adhesive layer 22 connected to the second part 12, a release film 70 disposed on the first adhesive layer 21 away from the first part 11, a support layer 4 disposed on the second adhesive layer 22 away from the second part 12, and a second protective film 72 covering the release film 70 and the support layer 4.

[0084] For example, before attaching the backing film 7, the above preparation method further includes the following steps S201 to S202:

[0085] Step S201: See Figure 4 A back film 7 is provided. The back film 7 includes a first protective film 71, a first adhesive layer 21 and a second adhesive layer 22, a release film 70, a support layer 4, and a second protective film 72. The peel force between the first protective film 71 and the first adhesive layer 21 is less than the peel force between the release film 70 and the first adhesive layer 21, and the peel force between the first protective film 71 and the second adhesive layer 22 is less than the peel force between the support layer 4 and the second adhesive layer 22.

[0086] Step S202: See Figure 9 and Figure 10 Remove the first protective film 71 and attach the first adhesive layer 21 and the second adhesive layer 22 of the back film 7 to the second surface 102. Because the peel force between the release film 70 and the first adhesive layer 21 is greater than that between the first protective film 71 and the first adhesive layer 21, there will be no reverse release problem during the removal of the first protective film 71, that is, the release film 70 will not be accidentally lifted, thus ensuring the smooth progress of the bonding process.

[0087] For example, see Figure 11 and Figure 12 After attaching the back film 7 to the second surface 102, the above preparation method further includes forming an optical adhesive layer 20 on the first surface 101, and cutting the optical adhesive layer 20, the display panel 1, the first adhesive layer 21, the release film 70, and the second protective film 72 to obtain the following: Figure 11 and Figure 12 The stacked structure is shown in the figure. For example, the above-described cutting process can be laser cutting. In the process of cutting the display panel 1, not only is the outer contour of the display panel 1 cut, but a through-hole 103 is also cut into the display panel 1.

[0088] See Figure 13 and Figure 14 After laser cutting and stacking the film layers, the above preparation method further includes attaching the cover glass layer 5 to the side of the optical adhesive layer 20 away from the display panel 1, the orthographic projection of the cover glass layer 5 on the display panel 1 covering the first part 11, and the cover glass layer 5 being used to protect the first part 11.

[0089] Step S3: See Figure 15 and Figure 16 Remove the second protective film 72 and the release film 70.

[0090] Step S4: See Figure 17 and Figure 18 The ultrathin glass layer 3 is adhered to the side of the first adhesive layer 21 away from the first part 11. The ultrathin glass layer 3 has the same thickness as the release film 70, effectively replacing the release film 70 with the ultrathin glass layer 3. For example, the folding support assembly 6 can be adhered to the ultrathin glass layer 3 using fluorinated ethylene propylene (FEP).

[0091] For example, see Figure 17 and Figure 18 After attaching the ultra-thin glass layer 3, attach the folding support assembly 6 to the side of the ultra-thin glass layer 3 away from the first part 11, thereby improving the support of the back of the display panel 1.

[0092] In some embodiments, see Figure 17 and Figure 18 Before attaching the ultrathin glass layer 3, the above-mentioned preparation method further includes cutting and tempering the ultrathin glass (UTG) to form an ultrathin glass layer 3 with a target shape, so that the ultrathin glass layer 3 has excellent bending performance and impact resistance, thereby ensuring that the ultrathin glass layer 3 can play an effective supporting role. By pre-cutting and tempering the UTG to form the ultrathin glass layer 3, the process problem of UTG being unable to be cut at the module end is solved, reducing the process difficulty of this application.

[0093] For example, the target shape includes the following: along the Y direction, the upper boundary of the ultrathin glass layer 3 extends beyond the upper boundary of the display panel 1; along the X direction, the left and right boundaries of the ultrathin glass layer 3 extend beyond the left and right boundaries of the first part 11, so as to achieve effective support of the ultrathin glass layer 3 for the first part 11; and the size and position of the first part 11 of the display panel 1 are set with a certain margin to reduce the difficulty of bonding the ultrathin glass layer 3 and the first part 11. For example, the three side boundaries of the ultrathin glass layer 3 extend beyond the three side boundaries of the first part 11 by at least 0.1 mm.

[0094] Furthermore, along the Y direction, the lower boundary of the ultra-thin glass layer 3 is flush with the lower boundary of the display panel 1, that is, the boundary of the ultra-thin glass layer 3 does not extend beyond the side of the first part 11 near the second part 12, so as to facilitate the wiring setup here, and to facilitate the subsequent bending step of the second part 12.

[0095] The aforementioned target shape also includes forming a through-hole 30 on the ultra-thin glass layer 3. The outer boundary of the orthographic projection of the through-hole 30 on the display panel 1 extends beyond the outer boundary of the light-transmitting hole 103, allowing the through-hole 30 to fully expose the light-transmitting hole 103 and preventing the ultra-thin glass layer 3 from blocking light. For example, the through-hole 30 and the light-transmitting hole 103 can be circular, with the outer boundary of the orthographic projection of the through-hole 30 on the display panel 1 extending beyond the outer boundary of the light-transmitting hole 103 by at least 0.1 mm. By setting the outer boundary of the through-hole 30 to extend beyond the outer boundary of the light-transmitting hole 103, a certain margin is provided for the alignment of the through-hole 30 and the light-transmitting hole 103, thereby reducing the difficulty of bonding the ultra-thin glass layer 3 and the first part 11.

[0096] Step S5: See Figure 2 The second part 12 is bent to the side of the second surface 102 close to the first part 11 to form the display module 10.

[0097] The preparation method provided in this application involves attaching a back film 7 to the second surface 102 of a display panel 1. The display panel 1 includes a first portion 11 with a display area and a second portion 12 with a fan-out area. The back film 7 includes a first adhesive layer 21, a second adhesive layer 22, a release film 70, a support layer 4, and a second protective film 72. After removing the second protective film 72 and the release film 70, an ultra-thin glass layer 3 is attached to the side of the first adhesive layer 21 away from the first portion 11. The second portion 12 is then bent to the side of the second surface 102 close to the first portion 11 to form a display module 10. Because the ultra-thin glass layer 3 has excellent bending performance and impact resistance, by providing an ultra-thin glass layer 3 on the back of the first portion 11, creases caused by folding the first portion 11 can be effectively reduced, and the impact resistance of the display panel 1 can be improved, thereby improving the durability of the display module 10.

[0098] Figure 19 for Figure 6 A step diagram illustrating step S4 of pasting an ultra-thin glass layer.

[0099] In some embodiments, see Figure 19After the first bonding process of attaching the ultrathin glass layer 3, the above preparation method further includes forming a third adhesive layer 62 on one side of the folding support assembly 61 to form the support structure 9. For example, the material of the folding support assembly 61 can be stainless steel (SUS), and the material of the third adhesive layer 62 can be FEP. Then, through a second bonding process, the support structure 9 is attached to the ultrathin glass layer 3, that is, the folding support assembly 61 is attached to the ultrathin glass layer 3 through the third adhesive layer 62.

[0100] Figure 20 for Figure 6 Another step diagram for step S4 of the process is shown below, showing how to paste the ultra-thin glass layer.

[0101] In some embodiments, see Figure 20 Before attaching the ultrathin glass layer 3, the above preparation method further includes forming a third adhesive layer 62 on the ultrathin glass layer 3 to form a support structure 9. The first bonding step is to attach the support structure 9 to the first part 11, and then a second bonding step is to attach the folding support assembly 61 to the third adhesive layer 62. For example, the material of the folding support assembly 61 can be SUS, and the material of the third adhesive layer 62 can be FEP.

[0102] Figure 21 for Figure 6 Another step diagram for step S4 of the process is shown below, showing how to paste the ultra-thin glass layer.

[0103] In some embodiments, see Figure 21 Before bonding the ultrathin glass layer 3, the above preparation method further includes forming a support structure 9. The support structure 9 includes the stacked ultrathin glass layer 3, the third adhesive layer 62, and the folded support assembly 61. That is, the support structure 9 is supplied as a single piece and can be bonded in one step. For example, the material of the folded support assembly 61 can be SUS, and the material of the third adhesive layer 62 can be FEP.

[0104] On the other hand, embodiments of this application also provide a method for manufacturing a display module. Figure 22 Flowchart of another method for manufacturing the display module provided in this application; Figures 23-24 for Figure 22 The preparation method is illustrated in the following diagrams.

[0105] See Figure 22 The preparation method includes the following steps S1 to S5:

[0106] Step S1: See Figure 7 and Figure 8The display panel 1 is provided, which includes a first surface 101 and a second surface 102 opposite to each other. The display panel 1 also includes a first part 11 with a display area and a second part 12 with a fan-out area.

[0107] Step S2: See Figure 23 The back film 7 is attached to the second surface 102. The back film 7 includes a process film 73 connected to the first part 11, a second adhesive layer 22 connected to the second part 12, a support layer 4 disposed on the second adhesive layer 22 away from the second part 12, and a second protective film 72 covering the process film 73 and the support layer 4.

[0108] For example, see Figure 23 After the back film 7 is attached, the above preparation method further includes forming an optical adhesive layer 20 on the first surface 101, and cutting the optical adhesive layer 20, the display panel 1, the first adhesive layer 21, the process film 73, and the second protective film 72 to obtain a stacked structure of the target shape. The above cutting process can be laser cutting. After laser cutting the stacked film layers, the cover glass layer 5 is attached to the side of the optical adhesive layer 20 away from the display panel 1. The orthogonal projection of the cover glass layer 5 on the display panel 1 covers the first part 11, and the cover glass layer 5 is used to protect the first part 11.

[0109] Step S3: See Figure 24 Remove the second protective film 72 and the process film 73.

[0110] Step S4: See Figure 17 and Figure 18 The ultra-thin glass layer 3 is then attached to the first part 11.

[0111] For example, before attaching the ultra-thin glass layer 3, the ultra-thin glass (UTG) is cut and tempered to form an ultra-thin glass layer 3 with a target shape, giving the ultra-thin glass layer 3 excellent bending and impact resistance, thereby ensuring that the ultra-thin glass layer 3 can play an effective supporting role. By pre-cutting and tempering the UTG to form the ultra-thin glass layer 3, the process difficulty of not being able to cut the UTG at the module end is solved, reducing the process complexity.

[0112] Step S5: See Figure 2 The second part 12 is bent to the side of the second surface 102 close to the first part 11 to form the display module 10.

[0113] Figure 25 for Figure 22 A step diagram illustrating step S4 of pasting an ultra-thin glass layer.

[0114] In some embodiments, see Figure 25Before attaching the ultrathin glass layer 3, the above preparation method further includes forming a first adhesive layer 21 on the first part 11 through a first bonding process. The folding support assembly 61 is then attached to the ultrathin glass layer 3 through a third adhesive layer 62 to form the support structure 9. For example, the material of the first adhesive layer 21 can be PSA, the material of the folding support assembly 61 can be SUS, and the material of the third adhesive layer 62 can be FEP. Then, the ultrathin glass layer 3 is attached through a second bonding process, that is, the support structure 9 is attached to the side of the first adhesive layer 21 away from the first part 11.

[0115] Figure 26 for Figure 22 Another step diagram for step S4 of the process is shown below, showing how to paste the ultra-thin glass layer.

[0116] In some embodiments, see Figure 26 Before attaching the ultrathin glass layer 3, the above preparation method further includes forming a first adhesive layer 21 on the ultrathin glass layer 3 to form a support structure 9. The support structure 9 is then attached to the first part 11 through a first bonding process, that is, the ultrathin glass layer 3 is attached to the first part 11 through the first adhesive layer 21. After attaching the support structure 9, the above preparation method further includes forming a third adhesive layer 62 on one side of the folding support assembly 61, and attaching the folding support assembly 61 to the ultrathin glass layer 3 through the third adhesive layer 62 through a second bonding process. For example, the material of the first adhesive layer 21 can be PSA, the material of the folding support assembly 61 can be SUS, and the material of the third adhesive layer 62 can be FEP.

[0117] Figure 27 for Figure 22 Another step diagram for step S4 of the process is shown below, showing how to paste the ultra-thin glass layer.

[0118] In some embodiments, see Figure 27 Before attaching the ultrathin glass layer 3, the above preparation method further includes forming a first adhesive layer 21 and a third adhesive layer 62 on opposite sides of the ultrathin glass layer 3 to form a support structure 9. The support structure 9 is then attached to the first part 11 through a first bonding process. After attaching the support structure 9, the folding support assembly 61 is attached to the third adhesive layer 62 through the first bonding process. For example, the material of the first adhesive layer 21 can be PSA, the material of the folding support assembly 61 can be SUS, and the material of the third adhesive layer 62 can be FEP.

[0119] Figure 28 for Figure 22 Another step diagram for step S4 of the process is shown below, showing how to paste the ultra-thin glass layer.

[0120] In some embodiments, see Figure 28Before attaching the ultrathin glass layer 3, the above preparation method further includes forming a support structure 9. The support structure 9 includes a first adhesive layer 21, an ultrathin glass layer 3, a third adhesive layer 62, and a folded support assembly 61, all stacked together. That is, the support structure 9 is supplied as a single piece and can be bonded in one step. Attaching the ultrathin glass layer 3 involves attaching the support structure 9, including the ultrathin glass layer 3, to the first part 11 using the first adhesive layer 21. For example, the material of the first adhesive layer 21 can be PSA, the material of the folded support assembly 61 can be SUS, and the material of the third adhesive layer 62 can be FEP.

[0121] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A display module, characterized by include: The display panel includes a first part having a display area and a second part having a fan-out area. The first part includes opposing display surfaces and non-display surfaces, and the second part is bent to the side closer to the non-display surface. A first adhesive layer and a second adhesive layer, wherein the first adhesive layer is connected to the non-display surface; the second adhesive layer is disposed on the side of the second part closer to the first part, and the second adhesive layer is connected to the second part; An ultra-thin glass layer and a support layer are provided, wherein the ultra-thin glass layer is disposed on the side of the first adhesive layer away from the first part and is connected to the first adhesive layer; the support layer is disposed on the side of the second adhesive layer close to the first part and is connected to the second adhesive layer.

2. The display module according to claim 1, characterized in that, The first part includes a first boundary and a second boundary opposite each other along a first direction, and a third boundary and a fourth boundary opposite each other along a second direction, wherein the first direction intersects the second direction; the third boundary is farther away from the second part than the fourth boundary; The ultrathin glass layer includes a fifth boundary and a sixth boundary opposite to each other along the first direction, and a seventh boundary and an eighth boundary opposite to each other along the second direction, wherein the seventh boundary is farther away from the second part than the eighth boundary; In the first direction, the fifth boundary extends to the outside of the first boundary, and the sixth boundary extends to the outside of the second boundary; in the second direction, the seventh boundary extends to the outside of the third boundary.

3. The display module according to claim 2, characterized in that, The first boundary and the third boundary have a first corner at their connection, and the second boundary and the third boundary have a second corner at their connection. The fifth boundary and the seventh boundary have a third corner at their connection, and the sixth boundary and the seventh boundary have a fourth corner at their connection. The outer boundary of the third corner extends beyond the outer boundary of the first corner, and the outer boundary of the fourth corner extends beyond the outer boundary of the second corner.

4. The display module of claim 2 or 3, wherein, In the first direction, the eighth boundary is flush with the fourth boundary.

5. The display module of claim 1, wherein, The display panel also includes a light-transmitting hole disposed in the display area; The ultrathin glass layer includes through holes, and the outer boundary of the orthographic projection of the through holes on the display panel extends beyond the outer boundary of the light-transmitting holes.

6. The display module of claim 1, wherein, The sum of the thicknesses of the first adhesive layer and the ultra-thin glass layer is equal to the sum of the thicknesses of the second adhesive layer and the support layer.

7. The display module of claim 1, wherein, The display module further includes a folding support assembly, which is disposed on the side of the ultra-thin glass layer away from the first part and connected to the ultra-thin glass layer.

8. A back film characterized by, include: First protective film; The first adhesive layer and the second adhesive layer are disposed on one side of the first protective film; A release film and a support layer, wherein the release film is disposed on the side of the first adhesive layer away from the first protective film, and the support layer is disposed on the side of the second adhesive layer away from the first protective film; A second protective film covers the release film and the support layer; Wherein, the thickness of the first adhesive layer is greater than the thickness of the second adhesive layer; The first adhesive layer includes a ninth boundary near the second adhesive layer, and the release film includes a tenth boundary near the support layer, the tenth boundary extending to the outside of the ninth boundary.

9. The backsheet according to claim 8, characterized in that, The peel force between the first protective film and the first adhesive layer is less than the peel force between the release film and the first adhesive layer; and the peel force between the first protective film and the second adhesive layer is less than the peel force between the support layer and the second adhesive layer.

10. A display device, characterized in that, include: The display module as described in any one of claims 1 to 7; The controller is electrically connected to the display module.

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