Cover plate assembly, display module and manufacturing method of display module

Abstract

The invention relates to a cover plate assembly, a display module and a manufacturing method of the display module, the cover plate assembly is applied to the light emitting side of a display panel, the cover plate assembly is characterized by comprising a cover plate layer, the cover plate layer is shadow-free ultra-thin glass, the cover plate layer comprises a first surface and a second surface which are oppositely arranged, and the first surface and the second surface are opposite to each other. After the cover plate assembly and the display panel are assembled, the first surface is located on the side, away from the display panel, of the cover plate layer, a groove is formed in a first area, corresponding to a bending area of the display panel, of the first surface, and the edge portion of the groove is in smooth transition with the first surface where the groove is located.

Description

Technical Field

[0001] The present invention relates to the technical field of display product manufacturing, and in particular, to a cover plate assembly, a display module, and a manufacturing method of the display module. Background Art

[0002] With the rapid development of electronic devices, foldable screens have been favored by the market due to their portability and large-screen display advantages. However, existing foldable devices have some limitations in design, such as insufficient strength of the folding module, poor touch feeling, and orange peel imprints on the surface. These problems limit the performance and user experience of the devices. To address the issue of improving surface strength, there is currently a module design that uses UFG (unequal-thickness glass) to replace UTG (ultra-thin glass). The conventional solution is that the UFG grooved area faces downward, and a layer of lower modulus and tensile-resistant Polymer (resin material) is coated in the grooved area for filling.

[0003] Polymer can play a role in filling the step difference, but through the stress analysis of the module in the bent state, Polymer cannot play a role in adjusting the neutral layer, and at the same time, it will increase the stress on OCA1 (the optical adhesive layer between UFG and the display panel) and the subsequent film layers. When the thickness of Polymer is thicker, the failure risk of OCA1 and the Panel is higher. That is, the solution of setting a groove on the side of UFG facing the display panel and adding Polymer in the groove cannot make a module with a high step difference, and the folding module has insufficient strength. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a cover plate assembly, a display module, and a manufacturing method of the display module.

[0005] To achieve the above object, the technical solution adopted in the embodiment of the present invention is: A cover plate assembly is applied to the light-emitting side of a display panel, including a cover plate layer, the cover plate layer is a shadowless ultra-thin glass, the cover plate layer includes a first surface and a second surface arranged opposite to each other. After the cover plate assembly is assembled with the display panel, the first surface is located on the side of the cover plate layer away from the display panel, and a groove is provided in a first area on the first surface corresponding to the bending area of the display panel, and the edge part of the groove is smoothly transitioned with the first surface where it is located.

[0006] Optionally, in the thickness direction of the cover plate layer, the groove has a trapezoidal structure, the bottom surface of the groove is parallel to the second surface, and in the direction parallel to the first surface, the length of the bottom surface of the groove is less than the length of the open end of the groove.

[0007] Optionally, in the direction parallel to the first surface, the length of the groove is greater than or equal to 50 mm.

[0008] Optionally, the step difference between the groove and the first surface is 0.13 to 0.2 mm.

[0009] Optionally, it further includes a first coating applied to the first surface, and the first coating is made of a polymer material capable of absorbing impact resistance.

[0010] Optionally, it further includes a second coating for anti-fingerprint located on the first surface, and the second coating is located on the side of the first coating away from the cover plate layer.

[0011] An embodiment of the present invention further provides a display module, including a display panel and the above-mentioned cover plate assembly. The cover plate assembly is located on the light-emitting side of the display panel. The display panel includes a bending area and non-bending areas on opposite sides of the bending area in a first direction. A groove is provided in a first area corresponding to the bending area on the first surface of the cover plate layer, and the first direction is perpendicular to the extending direction of the bending axis of the bending area.

[0012] Optionally, in the first direction, the center line of the groove coincides with the bending axis.

[0013] Optionally, in the first direction, the length of the bottom surface of the groove is half of the length of the bending area.

[0014] Optionally, in the first direction, the length of the positive projection of the side of the groove on the display panel is 15 - 60 um.

[0015] Optionally, the thickness of the non-bending area of the cover plate layer is 150 - 600 um, and the distance between the bottom surface of the groove and the second surface of the cover plate layer is 30 - 60 um.

[0016] An embodiment of the present invention further provides a manufacturing method of a display module for manufacturing the above-mentioned display module, including the following steps:

[0017] Provide the above-mentioned cover plate assembly;

[0018] Provide a display panel;

[0019] Bond the cover plate assembly to the light-emitting side of the display panel through an auxiliary structure. The auxiliary structure includes a substrate layer and a filling layer located on the substrate layer, and the filling layer can be filled in the groove of the cover plate assembly.

[0020] The beneficial effects of the present invention are as follows: The cover plate assembly provided by the present invention is disposed on the light-emitting side of the display panel, which is a foldable display panel including a bending area and non-bending areas on opposite sides of the bending area. A groove is provided on the first surface of the cover plate layer away from the display panel. After the cover plate assembly is attached to the display panel, the orthographic projection of the groove on the display panel is located in the bending area of the display panel. The provision of the groove can reduce stress. Compared with the technical solution in the prior art where the groove is located on the side of the cover plate layer facing the display panel and a filling material is used to fill the groove, the cover plate assembly provided by the present invention improves the problem of excessive bending force on the display panel and is not limited by the thickness of the filling material filled in the groove, enabling a high step difference and further enhancing the mechanical performance of the folding module.

[0021] Moreover, in the cover plate assembly provided by the present invention, the cover plate layer is a shadowless ultra-thin glass, and the edge part of the groove provided on the cover plate layer is smoothly transitioned with the first surface where it is located. Without using a filling material to fill the groove, a break difference shadow that is invisible to the naked eye can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Showing the stress curves of each film layer at the bending center point of the UTG module in the prior art;

[0023] Figure 2 Showing the stress curves of each film layer at the bending center point of the UFG in the prior art;

[0024] Figure 3 Showing a schematic diagram of the cover plate layer in this embodiment;

[0025] Figure 4 Showing a schematic diagram of the cover plate layer in this embodiment;

[0026] Figure 5 Showing a schematic diagram of the crease of the cover plate layer in the prior art;

[0027] Figure 6 Showing a schematic diagram of the cover plate assembly in this embodiment;

[0028] Figure 7 Showing a schematic diagram of the display module in this embodiment;

[0029] Figure 8 Showing a schematic diagram of the orange peel pattern of the display module;

[0030] Figure 9 Showing relative in this embodiment Figure 8 Schematic diagram after improvement;

[0031] Figure 10 Showing a schematic diagram of the unfolded state of the display module;

[0032] Figure 11 It shows a schematic diagram of the folded state of the display module;

[0033] Figure 12 It shows a schematic diagram of the bending stress analysis of the display module;

[0034] Figure 13 It shows a schematic diagram of the state of the auxiliary structure, the auxiliary cover plate assembly and the display module being assembled;

[0035] Figure 14 Schematic diagram of the display module in the traditional technology;

[0036] Figure 15 Schematic diagram of the display module in the embodiments of the present invention. Detailed implementation manners

[0037] To make the purposes, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present disclosure.

[0038] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the ordinary meanings understood by those of ordinary skill in the art to which the present disclosure belongs. The "first", "second" and similar terms used in the present disclosure do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, the terms such as "a", "one" or "the" do not denote a quantity limitation, but mean that there is at least one. The terms such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0039] In the embodiments of the present disclosure, features such as "parallel", "perpendicular", and "identical" include the strictly defined features of "parallel", "perpendicular", "identical", etc., as well as cases with certain tolerances such as "substantially parallel", "substantially perpendicular", "substantially identical", etc. Considering measurements and tolerances related to the measurement of specific quantities (e.g., limitations of the measurement system), it means within the acceptable deviation range for a specific value determined by those of ordinary skill in the art. For example, "substantially" can mean within one or more standard deviations, or within 3% or 5% of the value.

[0040] In addition, in this text, unless otherwise defined, the terms "substantially", "essentially", "about", and "approximately" are used to describe and explain small variations. When used with an event or situation, these terms can cover the case where the event or situation occurs precisely, as well as the case where the event or situation occurs approximately. For example, when used with a numerical value, these terms can include a variation range of less than or equal to 10% of the numerical value, such as less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, less than or equal to ±0.05%. The term "substantially coplanar" can mean that two surfaces are arranged in the same plane within a micron range, for example, arranged in the same plane within 40μm, 30μm, 20μm, 10μm, or 1μm.

[0041] The display module includes a display panel, and a cover plate layer is connected to the light-emitting side of the display panel through an optical adhesive layer. In the traditional technology, the cover plate layer can be made of UTG ultra-thin glass. To improve the strength, the UTG ultra-thin glass can be replaced with UFG unequal-thickness glass. A plurality of film layers such as a back film (U-film) and a support structure (SUS) are stacked on the backlight side of the display panel. Figure 1 It is the force curve of each film layer at the bending center point of the UTG module in the traditional technology. Figure 2 It is the force curve of each film layer at the bending center point of the UFG in the traditional technology. Figure 1 and Figure 2 In, taking the bending center point of the light-emitting surface of the display module as the zero point, the abscissa represents the distance of each film layer from the origin, and the ordinate represents the stress value. Figure 1 and Figure 2In contrast, after using UFG to replace UTG, a groove is formed on the side of UFG facing the display panel, and Polymer is filled in the grooved area. Polymer cannot play a role in adjusting the stress on the neutral layer (i.e., the middle area of each film layer. The edge areas on the opposite sides of the middle area of each film layer in the light-emitting direction of the display panel will be subjected to tensile stress and compressive stress, and the force on the middle area is the smallest), and at the same time, it will increase the stress on OCA1 (the optical adhesive layer between the display panel and UFG) and the subsequent film layers. When the thickness of Polymer is thicker, the failure risk of OCA1 and the Panel is higher. That is, the solution of forming a groove on the side of UFG facing the display panel 2 and adding Polymer in the grooved area cannot be used for modules with high step differences. Currently, the thickness of UFG that can meet the folding requirements can only be about 100um, that is, the thickness is limited, and the effect of strength improvement is not obvious.

[0042] Reference Figure 3 and Figure 7 In view of the above problems, this embodiment provides a cover plate assembly, which is applied to the light-emitting side of the display panel 2 and includes a cover plate layer 1. The cover plate layer 1 is a shadowless ultra-thin glass. The cover plate layer 1 includes a first surface 11 and a second surface 12 that are oppositely arranged. After the cover plate assembly is assembled with the display panel 2, the first surface 11 is located on the side of the cover plate layer 1 away from the display panel 2. A groove 101 is provided in a first area of the first surface 11 corresponding to the bending area 100 of the display panel 2. The edge part of the groove 101 is smoothly transitioned with the first surface 11 where it is located.

[0043] A groove 101 is provided on the first surface 11 of the cover plate layer 1 away from the display panel 2. After the cover plate assembly is attached to the display panel 2, the orthographic projection of the groove 101 on the display panel 2 is located in the bending area 100 of the display panel 2. The setting of the groove 101 can reduce stress. Compared with the prior art in which the groove 101 is located on the side of the cover plate layer 1 facing the display panel 2 and a filling material is used to fill the groove 101, the cover plate assembly provided by the present invention improves the problem of excessive bending stress on the display panel 2 and is not limited by the thickness of the filling material filled in the groove 101, reaching more than 200um, avoiding the problem of neutral layer shift caused by the Polymer filled in the groove on the side of the cover plate layer 1 facing the display panel 2 in the prior art, and being able to achieve a high step difference, further improving the mechanical performance of the folding module.

[0044] It should be noted that Figure 1 and Figure 2They are the stress conditions of each film layer in the traditional UTG and UFG solutions. The abscissa is the thickness, and the ordinate is the stress. The negative direction of the ordinate is the compressive stress, and the positive direction is the tensile stress. When the stress of the film layer is 0, the thickness of the corresponding abscissa is the position of the neutral layer. Generally, the neutral layer is the middle thickness position of each film layer. The function of the OCA film layer (the optical adhesive layer between the cover plate and the display panel) in the UTG solution and the OCA1 film layer (the optical adhesive layer between the cover plate and the display panel) in the UFG solution is to redistribute the neutral layer of each film layer and reduce the maximum stress of the acting film layer. It can be seen from the UTG solution that the side of the UTG layer in contact with the right OCA film layer is subjected to tensile stress, and the OCA film layer is responsible for reducing the tensile stress of the UTG layer, so that the subsequent film layer (panel) is as close as possible to the neutral layer (Y = 0). However, the entire Polymer layer in the UFG solution is subjected to tensile stress, which will cause the stress initially received by the OCA1 film layer to be greater, unable to effectively reduce the stress of the subsequent film layer, and will also cause the OCA1 itself to fail.

[0045] Moreover, in the cover plate assembly provided by the present invention, the cover plate layer 1 is a shadowless ultra-thin glass, and the edge part of the groove 101 provided on the cover plate layer 1 is smoothly transitioned with the first surface 11 where it is located. The groove 101 does not need to be filled with a filling material. UFG uses a shadowless process to eliminate the problem of the transition line when the glass changes from thick to thin, so that there is no shadow problem for users during use.

[0046] Moreover, using the new high-step UFG can improve the overall stiffness of the folding module, and making the UFG the outermost layer allows consumers to feel the glass texture like that of a straight mobile phone;

[0047] In an exemplary embodiment, in the thickness direction of the cover plate layer 1, the groove 101 has a trapezoidal structure, the bottom surface of the groove 101 is parallel to the second surface, and in the direction parallel to the first surface 11, the length of the bottom surface of the groove 101 is less than the length of the open end of the groove 101.

[0048] In an exemplary embodiment, in the direction from the bending area 100 to the non-bending area 200, the bottom surface of the groove 101 is parallel to the second surface 12, and the center line of the groove 101 coincides with the bending axis of the bending area 100, improving the stress uniformity when the display module is folded.

[0049] In an exemplary embodiment, in the direction parallel to the first surface 11, the length of the groove 101 is greater than or equal to 50 mm.

[0050] Although the groove 101 on the cover plate layer 1 is located on the first surface 11 and appears to have a step, the actual step is only 0.13 - 0.2 mm, and this step is evenly distributed within a width range of 50 mm. In the prior art, the crease of a folding screen is 0.2 mm and is distributed within a range of 10 mm. In comparison Figure 4 and Figure 5 , in the present embodiment, the groove 101 of the cover plate layer 1 is located on the side away from the display panel 2, and the opening of the groove 101 is arranged facing away from the display panel 2, so it will be much lighter, to the extent that it is invisible to the naked eye.

[0051] In an exemplary embodiment, the step between the groove 101 and the first surface 11 is 0.13 - 0.2 mm.

[0052] Reference Figure 6 , in an exemplary embodiment, the cover plate assembly further includes a first coating 1001 coated on the first surface 11, and the first coating 1001 is made of a polymer material capable of absorbing impact resistance.

[0053] In the prior art, like the UTG solution, the UFG solution has an OCA + PET (an optical adhesive layer and a protective film layer stacked on the side of the cover plate layer 1 away from the display panel 2) attached to the side of the cover plate layer 1 away from the display panel 2, and there is a problem of orange peel imprinting (refer to Figure 8 , Figure 8 where there are many light spots), because there are minute deformations on the surface of the PET protective film layer, and the modulus of the optical adhesive layer OCA between the protective film layer and the cover plate layer 1 is low (~30 Kpa), and after lamination, the PET squeezes the OCA to deform and causes the orange peel imprinting problem.

[0054] To improve the surface touch of the folding module and solve the orange peel imprinting problem, it is necessary to increase the thickness of the UFG and use a structure with a high modulus and low deformability on the surface layer of the module. However, in the prior art, the resin material filled in the groove 101 limits the overall thickness of the cover plate layer 1. In the present embodiment, a groove 101 is provided on the first surface 11 of the cover plate layer 1 to achieve a high-step UFG, which can improve the overall stiffness of the display module, and the cover plate layer 1 is made the outermost layer, that is, compared with the prior art, the optical adhesive layer and the protective film layer attached to the light-emitting side of the cover plate layer 1 are removed, enabling consumers to feel the glass texture like that of a straight phone. In the present embodiment, a high-modulus polymer material is coated on the first surface 11 of the cover plate layer 1 to improve the orange peel imprinting problem. Refer to Figure 9 , comparing Figure 9 and Figure 8 , obviously, Figure 9The picture in it is smoother, almost without light spots. At the same time, it can also improve the mechanical properties of the thinning area, enabling the ball-drop and pen-drop to reach the same level as that of laminating OCA + PET, and synchronously reducing the thickness of the module.

[0055] Exemplarily, the first coating 1001 is made of a polymer material capable of absorbing impact resistance, a multi-chain network polymer, which has the property of shear thickening. Its modulus at room temperature is between 2 GPa and 5 GPa, and it has a high transmittance, with a light transmittance of 92%.

[0056] Exemplarily, the first coating 1001 is uniformly coated on the cover plate layer 1, and the thickness e of the first coating 1001 ≥ 40 μm. Verification and comparison show that when the thickness of the first coating 1001 is greater than 40 μm, the test results of ball-drop and pen-drop in the middle area of the display module are comparable to those of the traditional technology of laminating OCA + PET on the light-emitting side of the cover plate layer 1.

[0057] In an exemplary embodiment, the first coating 1001 includes a first part on the light-emitting surface of the cover plate layer 1 and a second part around the periphery of the cover plate layer 1, that is, the first coating 1001 covers the outside of the cover plate layer 1 to effectively protect the cover plate layer 1 and play a role in preventing breakage and explosion.

[0058] When forming the first coating 1001, to ensure that the first coating completely covers the light-emitting surface of the cover plate layer 1, the coating range of the first coating 1001 will be larger than the surface area of the cover plate layer 1. After curing and forming, cutting is carried out. When cutting, the cutting line is outside the periphery of the cover plate layer 1 and has a gap with the edge of the cover plate layer 1 to avoid cutting the cover plate layer 1.

[0059] Exemplarily, the polymer material can be polyurethane epoxy resin, modified acrylic acid, etc.

[0060] The following table shows the comparison results of the mechanical properties of the cover plate assembly provided in this embodiment and the cover plate assembly in the traditional technology (including the cover plate in the cover plate assembly using ultra-thin glass UTG (i.e., the 30UTG solution with a thickness of 30um in the table) and the cover plate of the cover plate assembly using UFG, with a groove on the side of the cover plate facing the display panel 2 and a filling material filled in the grooved area (i.e., the conventional UFG solution in the table)) for pen-down creases. It can be seen from the comparison that the new UFG solution (i.e., the cover plate assembly provided in this embodiment) can reach the level of the conventional UFG solution (the cover plate in the traditional cover plate assembly uses unequal-thickness ultra-thin glass UFG, and the light-emitting layer of the cover plate is laminated with OCA + PET) in terms of pen-down performance. The thickness of the non-breaking pen-down in the bending area 100 is ≧160mm, and the thickness of the non-breaking pen-down in the non-bending area 200 is greater than 800mm. Moreover, the surface hardness of the cover plate assembly provided in this embodiment is increased because a first coating 1001 with a high modulus is coated. The surface hardness of the conventional UFG solution is not broken with a 2B pencil, and the new UFG solution is not broken with a 1H pencil for pen-down. The OCA + PET film layer provided in the conventional UFG solution is reduced, and the creep wrinkles of OCA and PET caused by bending are also reduced synchronously. Therefore, the creases of the new UFG solution are the slightest.

[0061]

[0062] Reference Figure 6 , in an exemplary embodiment, the cover plate assembly further includes a second coating 1003 (AF coating) located on the first surface 11 for anti-fingerprint, and the second coating 1003 is located on the side of the first coating 1001 away from the cover plate layer 1.

[0063] Reference Figure 6 , in an exemplary embodiment, a strengthening coating HC coating 1002 is further coated between the first coating 1001 and the second coating 1003 to protect the cover plate layer 1.

[0064] The thickness a` of the cover plate layer 1 in the traditional technology is about 100um, because the filling material filled in the grooved area of the cover plate layer 1 makes it difficult to thicken the thickness a` of the cover plate layer 1. The thickness a of the cover plate layer 1 provided in this embodiment can reach 150um, and even the thickness of the cover plate layer 1 provided in this embodiment can be more than 300um, effectively enhancing the strength of the display module. In some embodiments, the thickness of the cover plate layer 1 provided in this embodiment is 150 - 600um, but it is not limited thereto.

[0065] In this embodiment, the thinning area c value of the cover plate layer 1 is generally 1 / 2 of the length L of the bending area 100 of the entire folding display module. Figure 10 It is a schematic diagram of the display module in the unfolded state. Figure 11It is a schematic diagram showing the display module in a folded state. Figure 12 It is a schematic diagram for analyzing the bending force of the display module. Figure 12 The origin o in Figure 11 is the bending center point 0 in Figure 12 The total coordinate in Figure 11 is the stress value, and the abscissa is the distance between the test point along the arrow direction in Figure 12 and the origin o. According to the actual force analysis in Figure 3 , Figure 10 and Figure 11 , Figure 11 in the direction perpendicular to the bending axis of the bending area 100, the length of the thinning area (i.e., the length of the bottom surface of the groove 101 of the cover plate layer 1 in the direction perpendicular to the bending axis of the bending area 100) C (refer to

[0066] The relationship between the length L of the bending area 100 and the length of the thinning area C` = L in the traditional technology. Relatively speaking, the reduced length of the thinning area of the cover plate layer 1 in this embodiment can be converted into an increased length d of the transition area, which helps to improve the overall light and shadow effect of the first surface 11 of the cover plate layer 1 and reduce the physical step difference seen due to the groove 101 being located on the first surface 11 (i.e., on the side away from the display panel 2).

[0067] Exemplarily, the length L of the bending area is 15 - 40 mm, and the length d of the transition area in the direction perpendicular to the bending axis of the bending area is 15 - 60 mm, but it is not limited thereto.

[0068] Refer to Figure 7 , this embodiment of the present invention also provides a display module, including a display panel 2 and the above-mentioned cover plate assembly. The cover plate assembly is located on the light-emitting side of the display panel 2. The display panel 2 includes a bending area 100 and non-bending areas 200 located on opposite sides of the bending area 100 in a first direction. The groove 101 is provided in a first area corresponding to the bending area 100 on the first surface 11 of the cover plate layer 1, and the first direction is perpendicular to the extending direction of the bending axis of the bending area 100.

[0069] Exemplarily, in the first direction, the center line of the groove 101 coincides with the bending axis.

[0070] Exemplarily, in the first direction, the length c of the bottom surface of the groove 101 is half of the length L of the bending area 100.

[0071] Exemplarily, in the first direction, a length d of an orthographic projection of a side edge of the groove 101 on the display panel 2 is 15-60 um.

[0072] Exemplarily, the thickness of the non-bending area 200 of the cover layer 1 is 150-600 um, and the distance between the bottom surface of the groove 101 and the second surface 12 of the cover layer 1 is 30-60 um.

[0073] The thinning area c value of the cover layer 1 provided in this embodiment is generally 1 / 2 of the length L of the bending area 100 of the entire folding display module. Figure 6 According to the actual force analysis of the cover layer 1, C = L / 2 can meet the bending performance. The thinning area C' = L of the cover layer 1 in the conventional technology. Relatively speaking, the reduced length of the thinning area of ​​the cover layer 1 in this embodiment can be converted into an increased length d of the transition area, which helps to improve the light and shadow effect of the entire first surface 11 of the cover layer 1 and reduce the physical step difference seen because the groove 101 is located on the first surface 11 (i.e., on the side away from the display panel 2).

[0074] In the conventional technology, a pressure-sensitive adhesive layer PSA, a first back film layer BF, a pressure-sensitive adhesive layer PSA, a second back film layer BF, a pressure-sensitive adhesive layer PSA, and a supporting structure BKT are sequentially stacked on the backlight side of the display panel 2. In this embodiment, in order to achieve thinning, the second back film layer BF is omitted. Specifically, a pressure-sensitive adhesive layer PSA, a first back film layer BF, a pressure-sensitive adhesive layer PSA and a supporting structure BKT are sequentially stacked on the backlight side of the display panel 2.

[0075] Exemplarily, a middle frame 10 is provided around the display panel 2 , and the middle frame 10 is used to support and fix the cover layer 1 and the display panel 2 .

[0076] The following table shows the simulation results of the conventional solution of making a groove on the side of the cover layer 1 facing the display panel 2 and filling the groove area with a filling material (coating) (conventional UFG solution) and the design solution of setting a groove 101 on the first surface 11 of the cover layer 1 away from the display panel 2 (UFG solution of this embodiment). Figure 14 In the traditional UFG solution, the display module includes a display panel 3, the light-emitting side of the display panel 3 is connected to a cover layer 1 through an OCA1 optical adhesive layer 2, an OCA optical adhesive layer 12 and a PET protective film layer 13 are sequentially arranged on the light-emitting side of the cover layer 1, and a first sub-sensitive adhesive layer 4, a first back film 5, a second sub-sensitive adhesive layer 6, a second back film 7, a third sub-sensitive adhesive layer 8 and a support structure 9 are sequentially arranged on the backlight side of the display panel 3. Reference Figure 15, in the UFG solution provided in this embodiment, the display module includes a display panel 3. The light-emitting side of the display panel 3 is connected to a cover plate layer 1 through an OCA1 optical adhesive layer 2. A first coating 1001 (the first coating can cover the outside of the cover plate layer 1, but is not limited thereto) and a strengthening coating 1002 are sequentially provided on the light-emitting side of the cover plate layer 1. A first sub-sensitized adhesive layer 4, a first back film 5, a second sub-sensitized adhesive layer 6, a second back film 7, a third sub-sensitized adhesive layer 8, and a support structure 9 are sequentially provided on the backlight side of the display panel 3. At the same thickness of the cover plate layer 1 (the structures of the display module except the cover plate layer 1 are the same), in the traditional display module, because the filling material (coating) cannot change the neutral layer of each film layer, the hydrostatic pressure of each adhesive layer after filling the filling material will be significantly increased, and the failure risk is high, so a high-step difference design cannot be carried out. However, in the display module of this embodiment, since the groove 101 of the cover plate layer 1 faces upward (provided on the first surface 11 away from the display panel 2), the simulation shows that the hydrostatic stress of each film layer is within the feasible range. Because there is no filling material between the UFG (cover plate layer 1) and the OCA1 (optical adhesive layer), the forces on each film layer in the UFG solution with the groove 101 facing upward are equivalent to those on each film layer in the display module solution using UTG (ultra-thin glass with the same thickness).

[0077] Traditional UFG Solution UFG Solution of This Embodiment FMLOC 4.27‰ 1.94‰ CVD2 3.75‰ 1.85‰ OCA0 0.21 Mpa -- OCA1 0.64 Mpa 0.17 Mpa Ufilm 0.4 Mpa 0.28 Mpa PSA1 0.31 Mpa 0.21 Mpa PSA2 0.36 Mpa 0.18 Mpa UFG 676 Mpa 625 Mpa

[0078] It should be noted that the display panel includes a packaging layer, and the packaging layer can include at least one inorganic packaging layer and at least one organic packaging layer. Both FMLOC and CVD2 in the above table represent the inorganic packaging layer of the display panel. The data in the table represents the strain force received by the above-mentioned inorganic packaging layer. For example, when the undeformed state is represented as 1, the strain force received by the FMLOC layer after deformation in the traditional UFG solution is 4.27‰.

[0079] It should be noted that in the above table, the column of data corresponding to the traditional UFG solution corresponds to the stacked structure of the traditional display module, refer to Figure 14 . The column of data corresponding to the UFG solution of this embodiment corresponds to the stacked structure of the display module of this embodiment, refer to Figure 15 . Figure 14 and Figure 15 The numbers in each film layer of the stacked structure in represent the thickness values (unit: um) of the corresponding film layers. Among them, the thickness at the position of the groove 101 of the cover plate layer 1 is 30um, and the thickness of the non-groove 101 area is 165um. OCA0 represents the optical adhesive layer 12 on the light-emitting side of the cover plate layer 1 in the traditional UFG solution. PSA1 in the table represents the first pressure-sensitive adhesive layer 4, and PSA2 represents the second pressure-sensitive adhesive layer 8.

[0080] An embodiment of the present invention further provides a method for manufacturing a display module for manufacturing the above display module, including the following steps:

[0081] Provide the above cover plate assembly;

[0082] Provide a display panel 2;

[0083] Attach the cover plate assembly to the light-emitting side of the display panel 2 through an auxiliary structure. The auxiliary structure includes a substrate layer 1100 and a filling layer 1200 located on the substrate layer 1100. The filling layer 1200 can be filled into the groove 101 of the cover plate assembly.

[0084] In the traditional technology, a groove is formed on the surface of the cover plate layer 1 facing the display panel 2. However, when the cover plate layer 1 and the display panel 2 are attached and assembled, in order to ensure flatness and uniform stress, a filling material must be filled in the grooved area to fill the groove. Refer to Figure 13 , Figure 13 FIG. shows a schematic diagram of the state of using an auxiliary structure to assist in the assembly of the cover plate assembly and the display panel 2. Compared with the traditional technology, in this embodiment, the groove 101 corresponding to the bending area 100 of the display panel 2 on the cover plate layer 1 is formed on the first surface 11 of the cover plate layer 1. The first surface 11 is the side of the cover plate layer 1 away from the display panel 2. When the cover plate layer 1 and the display panel 2 are attached and assembled, an auxiliary structure can be used. The auxiliary structure includes a substrate layer 1100 and a filling layer 1200 located on one side of the substrate layer 1100. The filling layer 1200 can be filled into the groove 101 of the cover plate layer 1. After the filling layer 1200 is filled into the groove 101, the surface of the substrate layer 1100 facing the cover plate layer 1 contacts the first surface 11. In this way, the auxiliary structure and the cover plate layer 1 are attached to the display panel 2 as a whole. The surface of the cover plate layer 1 facing the display panel 2 is a plane, and the surface of the substrate layer 1100 away from the cover plate layer 1 is also a plane, ensuring the attachment quality between the cover plate layer 1 and the display panel 2. Since the groove 101 is located on the first surface 11 of the cover plate layer 1 away from the display panel 2, the auxiliary structure is located on the side of the cover plate layer 1 away from the display panel 2. After the assembly of the cover plate layer 1 and the display panel 2 is completed, the auxiliary structure can be removed.

[0085] Exemplarily, the filling layer 1200 is formed of materials such as PET by processes such as coating or evaporation, and is not limited herein.

[0086] This embodiment further provides a display device, and the display device includes the above display module.

[0087] The display device includes, but is not limited to, components such as a radio frequency unit, a network module, an audio output unit, an input unit, a sensor, a display unit, a user input unit, an interface unit, a memory, a processor, and a power supply. Those skilled in the art can understand that the structure of the above display device does not limit the display device. The display device may include more or fewer of the above components, or combine certain components, or have different component arrangements. In the embodiments of the present invention, the display device includes, but is not limited to, a display, a mobile phone, a tablet computer, a television, a wearable electronic device, a navigation display device, etc.

[0088] In addition, embodiments of the present disclosure provide an electronic device, including a memory, a processor, and one or more programs stored on the memory and executable on the processor. When the one or more programs are executed by the processor, the electronic device performs the wafer pick-and-place method as described above.

[0089] In one embodiment, the present disclosure further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0090] For the above computer-readable storage medium, since the computer program stored in its memory implements the steps in the above method embodiments when executed by a processor, similarly, the beneficial effects brought by the above wafer pick-and-place method can be obtained, which will not be elaborated here.

[0091] Those of ordinary skill in the art can understand that all or part of the processes of implementing the methods in the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it may include the processes of the above method embodiments. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided in the present application may include at least one of non-volatile and volatile memories. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical memory, etc. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0092] The following points need to be explained:

[0093] (1) The accompanying drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure, and other structures can refer to the general design.

[0094] (2) For clarity, in the accompanying drawings used to describe the embodiments of the present disclosure, the thickness of layers or regions is enlarged or reduced, that is, these drawings are not drawn to actual scale. It can be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, the element can be "directly" on or under the other element or there can be intervening elements.

[0095] (3) Without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0096] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. A cover plate assembly, applied to the light-emitting side of a display panel, characterized in that: It includes a cover layer, which is an ultra-thin glass without light and shadow. The cover layer includes a first surface and a second surface that are arranged opposite to each other. After the cover assembly is assembled with the display panel, the first surface is located on a side of the cover layer away from the display panel, and a groove is arranged on a first area of ​​the first surface corresponding to the bending area of ​​the display panel, and the edge of the groove smoothly transitions to the first surface where it is located.

2. The cover plate assembly according to claim 1, characterized in that: In the thickness direction of the cover layer, the groove has a trapezoidal structure, the bottom surface of the groove is parallel to the second surface, and in the direction parallel to the first surface, the length of the bottom surface of the groove is smaller than the length of the opening end of the groove.

3. The cover plate assembly according to claim 1, characterized in that: In a direction parallel to the first surface, a length of the groove is greater than or equal to 50 mm.

4. The cover plate assembly according to claim 1, characterized in that: The step difference between the groove and the first surface is 0.13-0.2 mm.

5. The cover plate assembly according to claim 1, characterized in that: It also includes a first coating layer coated on the first surface, wherein the first coating layer is made of a polymer material capable of absorbing impact resistance.

6. The cover plate assembly according to claim 5, characterized in that: The invention also includes a second coating layer for preventing fingerprints and located on the first surface. The second coating layer is located on a side of the first coating layer away from the cover layer.

7. A display module, characterized in that: It comprises a display panel and a cover plate assembly as described in any one of claims 1 to 6, wherein the cover plate assembly is located on the light emitting side of the display panel, the display panel comprises a bending zone and non-bending zones located on opposite sides of the bending zone in a first direction, the groove is arranged in a first area on the first surface of the cover plate layer corresponding to the bending zone, and the first direction is perpendicular to the extension direction of the bending axis of the bending zone.

8. The display module according to claim 7, characterized in that: In the first direction, a center line of the groove coincides with the bending axis.

9. The display module according to claim 7, characterized in that: In the first direction, the length of the bottom surface of the groove is half the length of the bending area.

10. The display module according to claim 7, characterized in that: In the first direction, the length of the orthographic projection of the side of the groove on the display panel is 15-60 um.

11. The display module according to claim 7, characterized in that: The thickness of the non-bending area of ​​the cover layer is 150-600 um, and the distance between the bottom surface of the groove and the second surface of the cover layer is 30-60 um.

12. A method for manufacturing a display module, characterized in that: The method for manufacturing the display module according to any one of claims 7 to 11 comprises the following steps: Providing a cover plate assembly according to any one of claims 1 to 6; providing a display panel; The cover plate assembly is attached to the light-emitting side of the display panel through an auxiliary structure, wherein the auxiliary structure comprises a substrate layer and a filling layer located on the substrate layer, and the filling layer can be filled in the groove of the cover plate assembly.

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