Folding display module, manufacturing method and display device

Abstract

This application provides a foldable display module, a manufacturing method, and a display device. The foldable display module includes a display panel and a first adhesive layer, wherein the first adhesive layer is located on the light-emitting side of the display panel, and / or on the backlight side of the display panel. The first adhesive layer includes a first portion and a plurality of second portions, the first portion and the second portions being adjacent, and the modulus of the second portions being greater than the modulus of the first portions. This application aims to improve the problem of scratches easily appearing on the surface of foldable screens during use.

Description

[Technical Field]

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

[0002] Foldable screens are a type of flexible screen, offering advantages such as small size and large display size. However, existing foldable screens suffer from issues during use, including surface scratches, air bubbles at the edges, and potential delamination between some of the internal film layers at the folding point. [Summary of the Invention]

[0003] In view of this, this application provides a foldable display module to improve the problem of scratches easily appearing on the surface of foldable screens during use.

[0004] In a first aspect, embodiments of this application provide a foldable display module, comprising: a display panel and a first adhesive layer, wherein the first adhesive layer is located on the light-emitting side of the display panel, and / or, the first adhesive layer is located on the backlight side of the display panel. The first adhesive layer includes a first portion and a plurality of second portions, the first portion and the second portions being adjacent, and the modulus of the second portions being greater than the modulus of the first portions.

[0005] In one embodiment of the first aspect, the first adhesive layer includes an optical adhesive and a plurality of microparticles doped in the optical adhesive, wherein at least a portion of the microparticles in the second portion are cross-linked with the optical adhesive. At least a portion of the microparticles in the first portion are not cross-linked with the optical adhesive. The density of microparticles cross-linked with the optical adhesive in the second portion is greater than the density of microparticles cross-linked with the optical adhesive in the first portion.

[0006] In one embodiment of the first aspect, the volume of the microparticles in the first temperature range is smaller than the volume of the microparticles in the second temperature range.

[0007] In one embodiment of the first aspect, the particle size of the microparticles is 10-200 nm.

[0008] In one embodiment of the first aspect, the concentration of microparticles in the second portion is greater than the concentration of microparticles in the first portion.

[0009] In one embodiment of the first aspect, the foldable display module includes a bending region and a non-bending region, and at least a portion of the plurality of second portions is located in the non-bending region.

[0010] In one embodiment of the first aspect, the foldable display module includes a bending region and a non-bending region, and at least a portion of the plurality of second portions is located in the bending region.

[0011] In one embodiment of the first aspect, the plurality of second portions include a plurality of first sub-portions and a plurality of second sub-portions, wherein the area of ​​the first sub-portions is greater than the area of ​​the second sub-portions.

[0012] In one embodiment of the first aspect, a portion of the first sub-part is located in the non-bending region, and a portion of the first sub-part is located in the bending region.

[0013] In one embodiment of the first aspect, the bending region includes a first edge region and a first intermediate region, the first edge region being located on the side of the first intermediate region near the frame region of the foldable display module. The non-bending region includes a second edge region and a second intermediate region, the second edge region being located on the side of the second intermediate region near the frame region of the foldable display module. At least a portion of the plurality of first sub-parts is located in the first edge region, and / or at least a portion of the plurality of first sub-parts is located in the second edge region.

[0014] In one embodiment of the first aspect, the projected shape of the first sub-part is dissimilar to the projected shape of the second sub-part in a direction perpendicular to the surface of the display panel.

[0015] In one embodiment of the first aspect, the foldable display module includes a plurality of first adhesive layers, the plurality of first adhesive layers including a first sub-adhesive layer and a second sub-adhesive layer, the first sub-adhesive layer and the second sub-adhesive layer being located in different film layers, and the area of ​​a first portion within the first sub-adhesive layer being different from the area of ​​a first portion within the second sub-adhesive layer.

[0016] In one embodiment of the first aspect, the foldable display module includes a polarizer located on the light-emitting side of the display panel. The side of the polarizer facing away from the display panel is bonded to a first adhesive layer. The sum of the areas of all the second portions of the first adhesive layer is S1. ′ The area of ​​the first adhesive layer is S1, where,

[0017] In one embodiment of the first aspect, the display panel includes a polymer film located on the light-emitting side of the display panel. The side of the polymer film facing the display panel is bonded to a first adhesive layer. The sum of the areas of all the second portions of the first adhesive layer is S2. ′ The area of ​​the first adhesive layer is S2, where,

[0018] Secondly, embodiments of this application also provide a method for using the foldable display module provided in the first aspect, comprising the steps of:

[0019] The initial adhesive layer is bonded to the corresponding film layer inside the foldable display module, and the initial adhesive layer includes the target area.

[0020] Align the target area with the cutout on the light shield.

[0021] The light from the irradiation source passes through the perforated part of the light shield and irradiates the target area of ​​the initial adhesive layer, so that the initial adhesive layer undergoes a chemical reaction in the target area to generate the second part.

[0022] Thirdly, embodiments of this application also provide a display device, including the foldable display module provided in the first aspect.

[0023] In this embodiment, the modulus of the second portion of the first adhesive layer is greater than that of the first portion, meaning the hardness of the second portion of the first adhesive layer is greater than that of the first portion. Simultaneously, the first adhesive layer includes multiple second portions, which increase the hardness of the first adhesive layer, while the first portions maintain the softness and viscosity of the first adhesive layer. Therefore, the first adhesive layer possesses both hardness and tackiness. During the use of the foldable display module, the hardness of the first adhesive layer helps reduce scratches on its surface, while the tackiness helps reduce delamination between the internal film layers of the foldable display module during use. [Attached Image Description]

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a foldable display module in the prior art of this application;

[0026] Figure 2 This is a schematic diagram of a foldable display module provided in an embodiment of this application;

[0027] Figure 3 A schematic diagram of a first adhesive layer provided in an embodiment of this application;

[0028] Figure 4 For this application Figure 3 A cross-sectional view along the NN' direction;

[0029] Figure 5 For this application Figure 4 A magnified view of a portion of region A in the middle;

[0030] Figure 6 For this application Figure 4 A magnified view of a portion of region A in the middle;

[0031] Figure 7A schematic diagram of a first adhesive layer provided in an embodiment of this application;

[0032] Figure 8 A schematic diagram of a first adhesive layer provided in an embodiment of this application;

[0033] Figure 9 A schematic diagram of a first adhesive layer provided in an embodiment of this application;

[0034] Figure 10 A schematic diagram of a first adhesive layer provided in an embodiment of this application;

[0035] Figure 11 A schematic diagram of a first adhesive layer provided in an embodiment of this application;

[0036] Figure 12 A schematic diagram of a first adhesive layer provided in an embodiment of this application;

[0037] Figure 13 A schematic diagram of a first adhesive layer provided in an embodiment of this application;

[0038] Figure 14 A schematic diagram of a first adhesive layer provided in an embodiment of this application;

[0039] Figure 15 A schematic diagram of a first adhesive layer provided in an embodiment of this application;

[0040] Figure 16 A schematic diagram of a first adhesive layer provided in an embodiment of this application;

[0041] Figure 17 A schematic diagram of a first adhesive layer provided in an embodiment of this application;

[0042] Figure 18 A schematic diagram of a first adhesive layer provided in an embodiment of this application;

[0043] Figure 19 A schematic diagram of a first adhesive layer provided in an embodiment of this application;

[0044] Figure 20 A schematic diagram of a first adhesive layer provided in an embodiment of this application;

[0045] Figure 21 This application provides a schematic diagram of a process for manufacturing a foldable display module.

[0046] Figure 22 This is a schematic diagram illustrating the fabrication of a foldable display module according to an embodiment of this application;

[0047] Figure 23 A display device is provided as an embodiment of this application.

[0048] Label Explanation

[0049] 100. Foldable display module; 101. Composite functional layer; 102. Protective layer; 103. Display panel; 104. Polarizer; 105. Cover plate; 110. First adhesive layer; 110a. First sub-adhesive layer; 110b. Second sub-adhesive layer; 111. First part; 112. Second part; 1121. First sub-part; 1122. Second sub-part; 113. Optical adhesive; 114. Microparticles; 120. Bending area; 121. First edge area; 122. First intermediate area; 130. Non-bending area; 131. Second edge area; 132. Second intermediate area; 140. Initial adhesive layer; 200. Mask; 300. Illumination light source; 301. Light beam; 400. Display device.

Detailed Implementation Methods

[0050] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0051] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0052] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0053] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0054] In the description of this specification, it should be understood that the terms "substantially", "approximately", "about", "about", "generally", "largely" used in the claims and embodiments of this application refer to values ​​that can be generally agreed upon within a reasonable range of process operations or tolerances, rather than a precise value.

[0055] It should be understood that although terms such as first, second, third, etc., may be used to describe regions in the embodiments of this application, these regions should not be limited to these terms. These terms are only used to distinguish regions from each other. For example, without departing from the scope of the embodiments of this application, a first region may also be referred to as a second region, and similarly, a second region may also be referred to as a first region.

[0056] Through meticulous and in-depth research, the applicant in this case has provided a solution to the problems existing in the prior art.

[0057] Figure 1 This is a schematic diagram of a foldable display module in the prior art of this application.

[0058] Please see Figure 1 The internal film layers of the foldable display module 100 include a composite functional layer 101, a protective layer 102, a display panel 103, a polarizer 104, and a cover plate 105. The protective layer 102 is located on the backlight side of the display panel 103, the composite functional layer 101 is located on the side of the protective layer 102 opposite to the display panel 103, the polarizer 104 is located on the light-emitting side of the display panel 103, and the cover plate 105 is located on the side of the polarizer 104 opposite to the display panel 103. It should be noted that with the development of depolarizer 104 technology, the polarizer 104 can be replaced by a polymer film.

[0059] The various film layers inside the foldable display module 100 are bonded together using optical adhesive 113. During use, the surface of the foldable display module 100 is prone to scratches. When the foldable display module 100 is frequently folded, air bubbles are easily generated at the edges, and the film layers at the folded areas are prone to delamination.

[0060] The inventors discovered that the reason why the surface of the foldable display module 100 is prone to scratches is that the hardness of the optical adhesive 113 connecting at least part of the film layer inside the foldable display module 100 is insufficient, and since the cover plate 105 of the foldable display module 100 is a flexible cover plate 105, the overall strength of the surface of the foldable display module 100 is insufficient, thus making it easy to get scratches.

[0061] The reason why air bubbles appear at the edges of the foldable display module 100 or the film layers at the folded area easily delaminate during use is that the optical adhesive 113 is either too soft or too hard. When the optical adhesive 113 is too soft, it lacks fixing points on the film layers it adheres to when folded, thus easily causing displacement. When the optical adhesive 113 is too hard, it reduces its flexibility and adhesion, making it prone to breakage or insufficient adhesion during folding. Based on these reasons, macroscopically, air bubbles appear at the edges of the foldable display module 100, and the film layers inside the folded display module 100 delaminate at the folded area.

[0062] Figure 2 This is a schematic diagram of a foldable display module provided in an embodiment of this application; Figure 3 This is a schematic diagram of a first adhesive layer provided in an embodiment of this application.

[0063] Please see Figures 2 to 3 This application provides a foldable display module, which includes a display panel 103 and a first adhesive layer 110. The first adhesive layer 110 is located on the light-emitting side of the display panel 103, and / or on the backlight side of the display panel 103. The first adhesive layer 110 includes a first portion 111 and a plurality of second portions 112, with the first portion 111 adjacent to the second portions 112. The modulus of the second portions 112 is greater than the modulus of the first portions 111. For example, the modulus of the second portions 112 is 1.5-2 times the modulus of the first portions 111.

[0064] In this embodiment, the modulus of the second portion 112 of the first adhesive layer 110 is greater than that of the first portion 111, meaning the hardness of the second portion 112 of the first adhesive layer 110 is greater than that of the first portion 111. Simultaneously, the first adhesive layer 110 includes multiple second portions 112, which increase the hardness of the first adhesive layer 110, while the first portion 111 ensures the softness and viscosity of the first adhesive layer 110. The inclusion of both the first portion 111 and multiple second portions 112 in the first adhesive layer 110 allows it to possess both hardness and softness / adhesion. During the use of the foldable display module 100, the hardness of the first adhesive layer 110 helps reduce scratches on its surface, while the softness / adhesion of the first adhesive layer 110 helps reduce delamination between the internal film layers of the foldable display module 100 during use.

[0065] It should be noted that the first adhesive layer 110 in the embodiments of this application can be Figure 1 Any optical adhesive in it. For example, such as Figure 2As shown, the first adhesive layer 110 is located on the side of the polarizer 104 facing away from the display panel 103, and is an optical adhesive 113 used to bond the polarizer 104 and the cover plate 105; for example, as Figure 3 As shown, the first adhesive layer 110 is located on the backlight side of the display panel 103 and is an optical adhesive 113 used to bond the display panel 103 and the protective layer 102.

[0066] Figure 4 For this application Figure 3 A cross-sectional view along the NN' direction; Figure 5 For this application Figure 4 A magnified view of a portion of region A in the middle; Figure 6 For this application Figure 4 A magnified view of a portion of region A in the middle.

[0067] Please see Figures 4 to 6 In one embodiment of this application, the first adhesive layer 110 includes an optical adhesive 113 and a plurality of microparticles 114 doped in the optical adhesive 113, and at least some of the microparticles 114 in the second portion 112 are cross-linked with the optical adhesive 113. For example, Figure 5 In the second portion 112 shown, some of the microparticles 114 are cross-linked with the optical adhesive 113, meaning that some of the microparticles 114 in the second portion 112 serve as cross-linking points. For example, Figure 6 The microparticles 114 in the second part 112 shown are all cross-linked with the optical adhesive 113, that is, each microparticle 114 in the second part 112 serves as a cross-linking point.

[0068] The reason why the microparticles 114 in the second part 112 can serve as crosslinking points is that the surface of each microparticle 114 in the second part 112 is modified with UV-active groups, which can undergo polymerization (i.e. crosslinking) under specific light conditions. The crosslinking of the microparticles 114 in the second part 112 with the optical adhesive 113 can improve the modulus of the second part 112.

[0069] At least some of the microparticles 114 in the first part 111 are not cross-linked with the optical adhesive 113. And the density of the microparticles 114 that are cross-linked with the optical adhesive 113 in the second part 112 is greater than the density of the microparticles 114 that are cross-linked with the optical adhesive 113 in the first part 111.

[0070] The density of microparticles 114 cross-linked with optical adhesive 113 refers to the number of microparticles 114 cross-linked with optical adhesive 113 per unit volume. The density of microparticles 114 cross-linked with optical adhesive 113 in the second part 112 is greater than that in the first part 111, resulting in a greater modulus in the second part 112 than in the first part 111, meaning the hardness of the second part 112 is greater than that of the first part 111. This ultimately achieves both hardness and soft adhesion in the first adhesive layer 110.

[0071] Please see Figure 5 and Figure 6 In one implementation of this embodiment, the density of the microparticles 114 cross-linked with the optical adhesive 113 in the first part 111 is zero. This can be understood as the microparticles 114 in the first part 111 not being cross-linked with the optical adhesive 113, meaning each microparticle 114 in the first part 111 is in a free state. The fact that the microparticles 114 in the first part 111 do not cross-link with the optical adhesive 113 maximizes the soft adhesion of the optical adhesive 113.

[0072] In one embodiment of this application, the volume of the microparticles 114 in a first temperature range is smaller than the volume of the microparticles 114 in a second temperature range. The upper limit of the first temperature range may be smaller than the lower limit of the second temperature range, wherein the upper limit refers to the maximum value within its temperature range, and the lower limit refers to the minimum value within its temperature range.

[0073] For example, the first upper temperature limit can be 10 degrees Celsius, and the second lower temperature limit can be 40 degrees Celsius. When the temperature is above 40 degrees Celsius, the microparticles 114 slowly expand, compressing the space for the polymer chains within the first adhesive layer, thus adjusting the modulus to increase slowly (expansion of approximately 300% at 80 degrees Celsius); when the temperature is below 10 degrees Celsius, the microparticles 114 slowly contract, releasing the space for the polymer chains to move, thus reducing the modulus (shrinking to 50% at -10 degrees Celsius). Therefore, the presence of the microparticles 114 helps stabilize the modulus of the display module during use from low to high temperatures. The volume of the microparticles 114 exhibits thermal expansion and contraction characteristics, which can increase the applicable temperature of the first adhesive layer 110, allowing the first adhesive layer 110 to maintain its application characteristics well at both high and low temperatures.

[0074] Please see Figure 5 or Figure 6In one implementation of this embodiment, the microparticles 114 are hollow particles. The hollow interior is filled with gas, giving the microparticles 114 excellent elasticity, thus improving the recovery ability of the first adhesive layer along the direction perpendicular to the surface of the display panel. Furthermore, the gas has good thermal expansion and contraction properties, allowing the volume of the microparticles 114 to change through the thermal expansion and contraction of the gas within the hollow interior. This enhances the linkage effect of the cross-linked microspheres with temperature changes. The microparticles 114 can be hollow spheres. The shell of the microparticles 114 can be made of acrylic esters, or a mixture of transparent materials such as polyurethane and silicone.

[0075] The table below compares the performance guidelines of the first adhesive layer provided in the embodiments of this application with those of existing optical adhesives.

[0076] Table 1 shows that the maximum width of the second part 112 is 25 μm (for example, the second part can be a cylinder with a diameter of 25 μm), the distance between two adjacent second parts 112 is 1 mm, and the modulus of the second part 112 is twice that of the first part 111. From the comparison results in Table 1, it can be seen that compared with optical adhesives in the prior art, the first adhesive layer provided in this embodiment has increased internal stress and reduced edge dislocations. This increase in internal stress and reduction in edge dislocations can effectively reduce the probability of bubbles appearing at the edges of the foldable display module and the probability of scratches appearing on the surface of the foldable display module. Furthermore, there is considerable room for modification in the size of the second part 112, the distance between the second parts, and the modulus ratio of the second part 112 to the first part 112. It also does not significantly affect the stress decoupling ability of the adhesive layer.

[0077] Stress (MPa) Marginal dislocation deformation Existing technology 0.777 0.2234 This application 0.793 0.2197 Change 2.06％ 1.65％

[0078] Table 1

[0079] In one embodiment of this application, the microparticles 114 have a particle size of 10-200 nm. This particle size of microparticles 114 ensures that the hardness of the second part 112 is not too hard after cross-linking with the optical adhesive 113, while retaining its softness and toughness.

[0080] Please see Figure 5 or Figure 6In one embodiment of this application, the concentration of microparticles 114 in the second portion 112 is greater than the concentration of microparticles 114 in the first portion 111. The concentration of microparticles 114 in the first portion 111 / second portion 112 refers to the number of microparticles 114 per unit volume. A higher concentration of microparticles 114 in the second portion 112 is beneficial for both increasing the modulus of the second portion 112 and maintaining the softness and stickiness of the first portion 111. In one implementation of this embodiment, the doping amount of microparticles 114 in the second portion 112 is 0.1-1%. The microparticles 114 can be doped during the application of optical adhesive.

[0081] Figure 7 This is a schematic diagram of a first adhesive layer provided in an embodiment of this application.

[0082] Please see Figure 3 or Figure 7 In one embodiment of this application, the foldable display module includes a bending area 120 and a non-bending area 130, which are adjacent to each other. The foldable display module is bent or folded in the bending area 120. It can be understood that during the folding process, the area where the folding occurs is the bending area 120, and the area where no bending occurs is the non-bending area 130.

[0083] At least some of the second portions 112 are located in the non-bending area 130, that is, there are second portions 112 in the non-bending area 130, which can effectively increase the modulus of the first adhesive layer 110 located in the non-bending area 130, and effectively reduce the probability of scratches on the surface of the folding display module 100 in this area and bubbles or delamination between the internal film layers of the folding display module 100 in the non-bending area 130.

[0084] Please see Figure 7 In one implementation of this embodiment, all of the second portions 112 are located in the non-bending area 130. That is, the first adhesive layer 110 in the bending area 120 includes only the first portion 111 and does not include the second portion 112. The first adhesive layer 110 in the bending area 120 includes only the first portion 111, which can maximize the softness and stickiness of the bending area 120.

[0085] Please see Figure 7 In one implementation of this embodiment, all of the second portions 112 are uniformly distributed in the non-bending region 130. The uniform distribution of all the second portions 112 in the non-bending region 130 helps to improve the uniformity of the modulus of the first adhesive layer 110 within the non-bending region 130.

[0086] Figure 8 This is a schematic diagram of a first adhesive layer provided in an embodiment of this application.

[0087] Please see Figure 3 or Figure 8 In one implementation of this application, some of the multiple second portions 112 are located in the non-bending region 130, and some of the multiple second portions 112 are located in the bending region 120. This can be understood as the first adhesive layer 110 including both the first portion 111 and the second portion 112 in both the bending region 120 and the non-bending region 130. Therefore, the modulus and softness / adhesion of the first adhesive layer 110 can be balanced in both the bending region 120 and the non-bending region 130.

[0088] Please see Figure 3 The multiple second parts 112 are not evenly distributed in the bending area 120 or the non-bending area 130.

[0089] Please see Figure 8 In one implementation of this application, a portion of the plurality of second portions 112 are uniformly distributed in the non-bending region 130, and a portion of the plurality of second portions 112 are uniformly distributed in the bending region 120. The modulus and softness / adhesion of the first adhesive layer 110 in both the bending region 120 and the non-bending region 130 can be balanced, and it is beneficial to improve the uniformity of the modulus of the first adhesive layer 110 in the bending region 120 or the non-bending region 130.

[0090] Figure 9 This is a schematic diagram of a first adhesive layer provided in an embodiment of this application.

[0091] Please see Figure 3 , Figure 8 or Figure 9 In one embodiment of this application, the foldable display module includes a bending area 120 and a non-bending area 130, and at least a portion of the plurality of second portions 112 are located in the bending area 120. The fact that at least a portion of the second portions 112 are located in the bending area 120, i.e., there are second portions 112 within the bending area 120, can effectively increase the modulus of the first adhesive layer 110 located in the bending area 120, and effectively reduce the probability of scratches on the surface of the foldable display module 100 in this area and the generation of bubbles or delamination between the internal film layers of the foldable display module 100 in the bending area 120.

[0092] Please see Figure 8 In one implementation of this embodiment, some of the multiple second portions 112 are located in the bending region 120, and some of the multiple second portions 112 are located in the non-bending region.

[0093] Please see Figure 9In one implementation of this embodiment, all of the second portions 112 are located in the bending region 120. This can be understood as the second portions 112 being located only in the bending region 120. The fact that the second portions 112 are located only in the bending region 120 increases the strength and toughness of the bending region 120. Therefore, the fact that the second portions 112 are located only in the bending region 120 ensures that the first adhesive layer 110 will not shift or break when the bending region 120 is repeatedly bent.

[0094] Figure 10 This is a schematic diagram of a first adhesive layer provided in an embodiment of this application.

[0095] Please see Figure 10 In one embodiment of this application, the plurality of second portions 112 include a plurality of first sub-parts 1121 and a plurality of second sub-parts 1122, wherein the area of ​​the first sub-parts 1121 is larger than the area of ​​the second sub-parts 1122. The area of ​​the first sub-parts 1121 refers to their surface area, and the area of ​​the second sub-parts 1122 refers to their surface area. The plurality of second portions 112 are designed differently, which allows the modulus of the first adhesive layer 110 to be diversified in different regions, so as to meet the different modulus requirements of the first adhesive layer 110 in different regions. For example, the junction of the bending region 120 and the non-bending region 130 is the part where the bending amplitude is the largest. Therefore, the modulus requirement of the first adhesive layer 110 at the junction of the bending region 120 and the non-bending region 130 is different from that of the bending region 120 or the non-bending region 130.

[0096] In one embodiment of this application, the plurality of second portions 112 include a plurality of first sub-parts 1121 and a plurality of second sub-parts 1122, wherein the modulus of the first sub-parts 1121 is greater than the modulus of the second sub-parts 1122. The plurality of second portions are designed differently, enabling the modulus of the first adhesive layer 110 to vary in different regions, thereby meeting the different modulus requirements of the first adhesive layer 110 in different regions. For example, the boundary between the bending region 120 and the non-bending region 130 is the location where the bending amplitude is greatest; therefore, the modulus requirement of the first adhesive layer 110 at the boundary between the bending region 120 and the non-bending region 130 differs from that of either the bending region 120 or the non-bending region 130.

[0097] Figure 11 A schematic diagram of a first adhesive layer provided in an embodiment of this application; Figure 12 A schematic diagram of a first adhesive layer provided in an embodiment of this application; Figure 13 This is a schematic diagram of a first adhesive layer provided in an embodiment of this application.

[0098] Please see Figures 11 to 13In one embodiment of this application, at least a portion of the plurality of first sub-parts 1121 are located in the non-bending region 130 near the bending region 120, and / or, at least a portion of the plurality of first sub-parts 1121 are located in the bending region 120 near the non-bending region 130. The first sub-parts 1121 are positioned near the boundary between the non-bending region 130 and the bending region 120 to increase the modulus of the first adhesive layer 110 located near the boundary between the non-bending region 130 and the bending region 120, thereby improving the toughness of the first adhesive layer 110 in this region and reducing the probability of the first adhesive layer 110 breaking and delaminating when repeatedly bent.

[0099] like Figure 11 As shown, the multiple first sub-parts 1121 set in the area adjacent to the boundary between the non-bending area 130 and the bending area 120 are all located within the non-bending area 130 and close to the bending area 120.

[0100] like Figure 12 As shown, the multiple first sub-parts 1121 set in the area adjacent to the boundary between the non-bending area 130 and the bending area 120 are all located within the bending area 120 and close to the non-bending area 130.

[0101] like Figure 13 As shown, a plurality of first sub-parts 1121 are provided in the area adjacent to the boundary between the non-bending area 130 and the bending area 120, some of which are located in the non-bending area 130 and close to the bending area 120, and others are located in the bending area 120 and close to the non-bending area 130.

[0102] Figure 14 A schematic diagram of a first adhesive layer provided in an embodiment of this application; Figure 15 This is a schematic diagram of a first adhesive layer provided in an embodiment of this application.

[0103] Please see Figure 14 or Figure 15 In one embodiment of this application, a portion of the first sub-part 1121 is located in the non-bending region 130, and a portion of the first sub-part 1121 is located in the bending region 120. This can be understood as follows: within at least a portion of the first sub-part 1121, a portion of the same first sub-part 1121 is located in the non-bending region 130, and a portion is located in the bending region 120. The same first sub-part 1121 is located both in the bending region 120 and the non-bending region 130, meaning the first sub-part 1121 is located at the boundary between the bending region 120 and the non-bending region 130.

[0104] in, Figure 14 The middle bend area is provided with a second sub-section 1122. Figure 15No second sub-part 1122 is provided within the bending zone. The modulus (or area) of the first sub-part 1121 is greater than that of the second sub-part 1122, resulting in high strength and good toughness at the boundary between the bending zone 120 and the non-bending zone 130. Therefore, by providing the first sub-part 1121 at the junction of the non-bending zone 130 and the bending zone 120, the first adhesive layer 110 can be effectively prevented from breaking at that location.

[0105] Figure 16 A schematic diagram of a first adhesive layer provided in an embodiment of this application; Figure 17 A schematic diagram of a first adhesive layer provided in an embodiment of this application; Figure 18 A schematic diagram of a first adhesive layer provided in an embodiment of this application; Figure 19 This is a schematic diagram of a first adhesive layer provided in an embodiment of this application; Figure 20 This is a schematic diagram of a first adhesive layer provided in an embodiment of this application.

[0106] Please see Figures 16 to 20 In one embodiment of this application, the bending area 120 includes a first edge area 121 and a first middle area 122, with the first edge area 121 located on the side of the first middle area 122 near the frame area of ​​the foldable display module. The non-bending area 130 includes a second edge area 131 and a second middle area 132, with the second edge area 131 located on the side of the second middle area 132 near the frame area of ​​the foldable display module. At least a portion of the plurality of first sub-parts 1121 is located in the first edge area 121, and / or at least a portion of the plurality of first sub-parts 1121 is located in the second edge area 131. A first sub-part 1121 is provided in the first edge region 121 or the second edge region 131, which increases the modulus of the first adhesive layer 110 located in the first edge region 121 or the second edge region 131, thereby improving the toughness of the first adhesive layer 110 located in the first edge region 121 or the second edge region 131, making the first adhesive layer 110 in the edge region less prone to displacement or breakage during use.

[0107] Figure 16 As shown, all of the multiple first sub-parts 1121 are located in the first edge region 121.

[0108] like Figures 17 to 19 As shown, some of the multiple first sub-parts 1121 are located in the first edge region 121, and some of the first sub-parts 1121 are located in the second edge region 131. Wherein, Figure 17 , Figure 18 or Figure 19 The distribution areas of the first sub-part 1121 are different. Figure 17 Multiple first sub-parts 1121 are distributed in the upper and lower sides of the region. Figure 18 Multiple first sub-parts 1121 are distributed throughout the entire first edge region 121. Figure 19 In addition to being distributed throughout the entire first edge region, multiple first sub-parts 1121 are also distributed at the boundary between the bending region 120 and the non-bending region 130.

[0109] like Figure 20 As shown, all of the multiple first sub-parts 1121 are located in the second edge region 131.

[0110] Please see Figures 16 to 20 In one implementation of this embodiment, the projection shape of the first sub-part 1121 located in the first edge region 121 or the second edge region 131 along the direction of the surface where the display panel 103 is located can be rectangular. The width of the rectangle can be 50-500um, and the difference between the length of the rectangle and the length of the first edge region 121 or the second edge region 131 along the extension line of the first sub-part 1121 is 50-1000um.

[0111] Please see Figures 16 to 19 In one implementation of this embodiment, when the first edge region 121 includes multiple first sub-parts 1121, the multiple first sub-parts 1121 are arranged in rows and columns in the first edge region 121. For example, the multiple first sub-parts 1121 are arranged in two rows and one column in the first edge region 121. The arrangement of multiple first sub-parts 1121 in rows and columns in the first edge region 121 can significantly increase the modulus of the first edge region 121, which is beneficial to improving the toughness of the first adhesive layer 110 in the first edge region 121, thereby preventing the first adhesive layer 110 from generating bubbles in the first edge region 121.

[0112] Please see Figures 17 to 20 In one implementation of this embodiment, when the second edge region 131 includes a plurality of first sub-parts 1121, the plurality of first sub-parts 1121 are arranged in rows and columns in the second edge region 131. For example, the first adhesive layer 110 includes two second edge regions 131, and the plurality of first sub-parts 1121 are arranged in one row and two columns in each second edge region 131. The arrangement of the plurality of first sub-parts 1121 in rows and columns in the second edge region 131 can significantly increase the modulus of the second edge region 131, which is beneficial to improving the toughness of the first adhesive layer 110 in the second edge region 131, thereby preventing the second adhesive layer from generating bubbles in the first edge region 121.

[0113] Please see Figures 10 to 20In one embodiment of this application, the projected shape of the first sub-part 1121 is dissimilar to the projected shape of the second sub-part 1122 along a direction perpendicular to the surface of the display panel 103. This difference in projected shape between the first sub-part 1121 and the second sub-part 1122 results in a difference in modulus between the regions belonging to the first sub-part 1121 and the second sub-part 1122, thus meeting the different modulus requirements of the first adhesive layer 110 in different regions.

[0114] For example, along the direction perpendicular to the surface where the display panel 103 is located, the projection shape of the first sub-part 1121 is at least one of X-shape, cross shape, rectangle, and polygon; the projection shape of the second sub-part 1122 is at least one of circle and ellipse.

[0115] In one embodiment of this application, the maximum distance between any two points in the second sub-part 1122 is 5-25 μm. Any two points in the second sub-part 1122 refer to any two points within the same second sub-part 1122. This maximum distance of 5-25 μm ensures that the first adhesive layer 110 meets the requirements for both modulus and softness / adhesion in the region of the second sub-part 1122.

[0116] Please see Figure 19 In one embodiment of this application, the plurality of first sub-parts 1121 include at least one first sub-part 1121a and at least one first sub-part 1121b, and the projected shapes of the first sub-parts 1121a and 1121b are dissimilar. This further achieves a difference in modulus between the regions of the first adhesive layer 110 belonging to the first sub-part 1121a and the regions belonging to the first sub-part 1121b.

[0117] In one implementation of this embodiment, the first sub-part 1121a and the first sub-part 1121b are located, one of which is located in the first edge region 121 and / or the second edge region 131, and the other is located in the non-bending region 130 near the bending region 120 and / or the bending region 120 near the non-bending region 130 and / or the junction of the bending region 120 and the non-bending region 130.

[0118] For example, the first sub-part 1121a is located in the first edge region 121, and / or, the first sub-part 1121a is located in the second edge region 131. The first sub-part 1121b is located in the non-bending region 130 near the bending region 120, and / or, the first sub-part 1121b is located in the bending region 120 near the non-bending region 130, and / or, the first sub-part 1121b is located at the junction of the bending region 120 and the non-bending region 130.

[0119] Please see Figure 1 In one embodiment of this application, the foldable display module includes multiple first adhesive layers 110, each including a first sub-adhesive layer 110a and a second sub-adhesive layer 110b. The first sub-adhesive layer 110a and the second sub-adhesive layer 110b are located in different film layers. The area of ​​a first portion 111 within the first sub-adhesive layer 110a is different from the area of ​​the first portion 111 within the second sub-adhesive layer 110b. This differentiated design between the first sub-adhesive layer 110a and the second sub-adhesive layer 110b allows for the consideration of different modulus requirements for the adhesive layers.

[0120] Please see Figure 1 In one embodiment of this application, the foldable display module includes multiple first adhesive layers 110, each including a first sub-adhesive layer 110a and a second sub-adhesive layer 110b. The first sub-adhesive layer 110a and the second sub-adhesive layer 110b are located in different film layers. The total area of ​​all the second portions 112 within the first sub-adhesive layer 110a is different from the total area of ​​all the second portions 112 within the second sub-adhesive layer 110b. This differentiated design between the first sub-adhesive layer 110a and the second sub-adhesive layer 110b allows for the consideration of different modulus requirements for the adhesive layers.

[0121] The first sub-adhesive layer 110a and the second sub-adhesive layer 110b are used to bond different film layers. For example, the first sub-adhesive layer 110a is used to connect the cover plate 105 and the polarizer 104, and the second sub-adhesive layer 110b is used to bond the display panel 103 and the polarizer 104. It should be noted that the above example is only one example of the first sub-adhesive layer 110a and the second sub-adhesive layer 110b, and is not a limitation on the first sub-adhesive layer 110a and the second sub-adhesive layer 110b.

[0122] In one embodiment of this application, the foldable display module includes a polarizer 104, which is located on the light-emitting side of the display panel 103. The side of the polarizer 104 facing away from the display panel 103 is bonded to a first adhesive layer 110. The sum of the areas of all the second portions 112 in the first adhesive layer 110 is S1. ′ The area of ​​the first adhesive layer 110 is S1, wherein, The sum of the areas of all the second portions 112 in the first adhesive layer 110 lies within this range, which can effectively meet the modulus requirements and soft adhesion requirements of the adhesive layer.

[0123] In one embodiment of this application, the display panel 103 includes a polymer film located on the light-emitting side of the display panel 103. The side of the polymer film facing the display panel 103 is bonded to a first adhesive layer 110. The sum of the areas of all the second portions 112 in the first adhesive layer 110 is S2. ′ The area of ​​the first adhesive layer 110 is S2, wherein, The sum of the areas of all the second portions 112 in the first adhesive layer 110 lies within this range, which can effectively meet the modulus requirements and soft adhesion requirements of the adhesive layer.

[0124] Figure 21 This application provides a schematic diagram of a process for manufacturing a foldable display module. Figure 22 This is a schematic diagram illustrating the fabrication of a foldable display module provided in an embodiment of this application.

[0125] Please see Figures 21 to 22 This application also provides a method for using a foldable display module in any of the foregoing embodiments, comprising the steps of:

[0126] S1. Adhere the initial adhesive layer 140 to the corresponding film layer in the foldable display module. The initial adhesive layer 140 includes the target area.

[0127] S2. Align the target area with the cutout 201 on the light shield 200.

[0128] S3. The light 301 of the irradiation light source 300 passes through the hollow part 201 of the light shield 200 and irradiates the target area of ​​the initial adhesive layer 140, so that the initial adhesive layer 140 undergoes a chemical reaction in the target area to generate the second part.

[0129] In one embodiment of this application, a perforation 201 is designed in every 0.5-2 square centimeters on the light-shielding plate 200. Light 301 from the irradiating light source 300 passes through the perforations 201 of the light-shielding plate 200, and the initial adhesive layer 140 typically completes its chemical reaction within 30-60 seconds. Due to the blocking effect of the light-shielding plate 200, the microparticles in the area not irradiated by the light source 300 have good mobility, resulting in minimal impact on the colloidal deformation capability.

[0130] The initial adhesive layer includes optical adhesive 113 and microparticles 114, with the microparticles 114 in a free state and not cross-linked with the optical adhesive 113. The irradiation light source 300 can be an ultraviolet light source.

[0131] The manufacturing method of the foldable display module provided in this application embodiment can obtain the foldable display module 100 provided in any of the foregoing embodiments. The obtained foldable display module 100 can effectively improve the problems of existing foldable display modules 100, such as easy generation of air bubbles at the edges, easy generation of scratches on the surface, and easy delamination between the internal film layers of the folded part.

[0132] The method for folding display modules also includes the following steps: repeat the above steps until all film layers in the folding display module 100 are laminated.

[0133] In one embodiment of this application, the cutout portion 201 of the light-shielding plate 200 includes a first cutout portion and a second cutout portion. An irradiation light source 300 passes through the first cutout portion and causes a chemical reaction in the initial adhesive layer on the target area, generating a first sub-part 1121. The irradiation light source 300 passes through the second cutout portion and causes a chemical reaction in the initial adhesive layer on the target area, generating a second sub-part 1122.

[0134] In one implementation of this embodiment, the first hollow portion includes at least one first hollow portion a and at least one first hollow portion b. An irradiation light source passes through the first hollow portion a and causes a chemical reaction in the initial adhesive layer on the target area, generating a first sub-part 1121a. An irradiation light source passes through the first hollow portion b and causes a chemical reaction in the initial adhesive layer on the target area, generating the first sub-part 1121b.

[0135] Figure 23 A display device is provided as an embodiment of this application.

[0136] Please see Figure 23 This application also provides a display device 400, including the foldable display module provided in any of the foregoing embodiments. The display device 400 can be a mobile phone, a PDA, a computer, a smart device, etc. The modulus of the second portion 112 of the first adhesive layer 110 is greater than the modulus of the first portion 111, that is, the hardness of the second portion 112 of the first adhesive layer 110 is greater than that of the first portion 111. At the same time, the first adhesive layer 110 includes a plurality of second portions 112, which increases the hardness of the first adhesive layer 110, while the first portion 111 maintains the softness and viscosity of the first adhesive layer 110. The inclusion of the first portion 111 and a plurality of second portions 112 in the first adhesive layer 110 enables the first adhesive layer 110 to have a moderate hardness, that is, the first adhesive layer 110 has both hardness and softness and stickiness. During the use of the foldable display module 100, the hardness of the first adhesive layer 110 helps to reduce scratches on the surface of the foldable display module 100 during use, and the softness and stickiness of the first adhesive layer 110 helps to reduce the phenomenon of delamination between the film layers inside the foldable display module 100 during use.

[0137] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A foldable display module, characterized in that, include: Display panel; The first adhesive layer is located on the light-emitting side of the display panel and / or on the backlight side of the display panel; The first adhesive layer includes a first part and a plurality of second parts, wherein the first part is adjacent to the second part, and the modulus of the second part is greater than that of the first part; The first adhesive layer includes an optical adhesive and a plurality of microparticles doped in the optical adhesive, wherein at least a portion of the microparticles in the second portion are cross-linked with the optical adhesive; The volume of the microparticles in the first temperature range is smaller than the volume of the microparticles in the second temperature range, and the upper limit of the first temperature range is smaller than the lower limit of the second temperature range.

2. The foldable display module according to claim 1, characterized in that, At least a portion of the microparticles in the first part are not cross-linked with the optical adhesive; the density of the microparticles in the second part that are cross-linked with the optical adhesive is greater than the density of the microparticles in the first part that are cross-linked with the optical adhesive.

3. The foldable display module according to claim 2, characterized in that, The microparticles have a diameter of 10-200 nm.

4. The foldable display module according to claim 2, characterized in that, The concentration of the microparticles in the second part is greater than the concentration of the microparticles in the first part.

5. The foldable display module according to claim 1, characterized in that, The foldable display module includes a bending area and a non-bending area, and at least a portion of the second portions of the plurality of second portions are located in the non-bending area.

6. The foldable display module according to claim 1, characterized in that, The foldable display module includes a bending area and a non-bending area, and at least a portion of the second portions is located in the bending area.

7. The foldable display module according to claim 5 or 6, characterized in that, The plurality of second parts include a plurality of first sub-parts and a plurality of second sub-parts, wherein the area of ​​the first sub-parts is greater than the area of ​​the second sub-parts.

8. The foldable display module according to claim 7, characterized in that, A portion of the first sub-part is located in the non-bending region, and a portion of the first sub-part is located in the bending region.

9. The foldable display module according to claim 7, characterized in that, The bending area includes a first edge area and a first middle area, wherein the first edge area is located on the side of the first middle area near the frame area of ​​the foldable display module; the non-bending area includes a second edge area and a second middle area, wherein the second edge area is located on the side of the second middle area near the frame area of ​​the foldable display module. Wherein, at least a portion of the plurality of first sub-parts is located in the first edge region, and / or, at least a portion of the plurality of first sub-parts is located in the second edge region.

10. The foldable display module according to claim 7, characterized in that, Along a direction perpendicular to the surface of the display panel, the projected shape of the first sub-part is not similar to the projected shape of the second sub-part.

11. The foldable display module according to claim 1, characterized in that, The foldable display module includes multiple first adhesive layers, each first adhesive layer including a first sub-adhesive layer and a second sub-adhesive layer. The first sub-adhesive layer and the second sub-adhesive layer are located in different film layers, and the area of ​​a first portion within the first sub-adhesive layer is different from the area of ​​a first portion within the second sub-adhesive layer.

12. The foldable display module according to claim 1, characterized in that, The foldable display module includes a polarizer located on the light-emitting side of the display panel; the side of the polarizer facing away from the display panel is bonded to the first adhesive layer; the sum of the areas of all the second portions in the first adhesive layer is... The area of ​​the first adhesive layer is ,in, .

13. The foldable display module according to claim 1, characterized in that, The display panel includes a polymer film located on the light-emitting side of the display panel; the side of the polymer film facing the display panel is bonded to the first adhesive layer; the sum of the areas of all the second portions in the first adhesive layer is... The area of ​​the first adhesive layer is ,in, .

14. A method for manufacturing a foldable display module according to any one of claims 1-13, characterized in that, Including the following steps: The initial adhesive layer is bonded to the corresponding film layer within the foldable display module, wherein the initial adhesive layer includes the target area; Align the target area with the cutout portion on the light-shielding plate; Light from the irradiation source is passed through the perforated portion of the light-shielding plate and irradiates the target area of ​​the initial adhesive layer, causing the initial adhesive layer to undergo a chemical reaction in the target area to generate the second part.

15. A display device, characterized in that, Includes the foldable display module as described in any one of claims 1-13.

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