Display module, preparation method thereof and display device

Abstract

The application provides a display module, a preparation method thereof and a display device, relates to the technical field of display, and aims to improve the warping problem of the display module. The display module comprises a display panel, an optical adhesive layer, an internal stress energy storage structure and a cover plate. The optical adhesive layer is arranged on the display panel, the internal stress energy storage structure is embedded in the optical adhesive layer, and the cover plate is arranged on the side of the optical adhesive layer away from the display panel. The shape of the internal stress energy storage structure is arc-shaped, and the arc top of the internal stress energy storage structure is concave in the direction close to the display panel. The internal stress energy storage structure is used for absorbing the internal stress of the optical adhesive layer, so that the warping problem is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display module, a preparation method thereof and a display device. BACKGROUND

[0002] At present, the display module usually has the problem of warping. Since the size of the medium and large size products is limited, the requirements of the customers for the warping problem of the display module are more stringent. The warping problem still needs to be further improved to meet the more stringent product requirements. SUMMARY

[0003] The present application provides a display module, a preparation method thereof and a display device, which aims to improve the warping problem of the display module.

[0004] To achieve the above-mentioned purpose, the embodiments of the present application provide the following technical solutions:

[0005] In one aspect, a display module is provided, comprising a display panel, an optical adhesive layer, an internal stress energy storage structure and a cover plate.

[0006] The optical adhesive layer is arranged on the display panel, the internal stress energy storage structure is embedded in the optical adhesive layer, and the cover plate is arranged on the side of the optical adhesive layer away from the display panel. The shape of the internal stress energy storage structure is arc-shaped, and the arc top of the internal stress energy storage structure is concave towards the direction close to the display panel.

[0007] In the present application, the arc-shaped internal stress energy storage structure is added, the internal stress energy storage structure is embedded in the optical adhesive layer, and the arc top of the internal stress energy storage structure is concave towards the direction close to the display panel.

[0008] In the process of preparing the above structure, optical adhesive is coated on the upper and lower surfaces of the internal stress energy storage structure, then the structure is used to paste the cover plate on the display panel, and then the optical adhesive is cured. The process of curing the optical adhesive will generate internal stress. The side of the optical adhesive close to the cover plate exerts pressure on the internal stress energy storage structure, and the side of the optical adhesive close to the display panel exerts tension on the internal stress energy storage structure. The pressure and tension received by the internal stress energy storage structure can be decomposed along its arc surface, and finally they are all "absorbed" by the internal stress energy storage structure, avoiding the internal stress acting on the display panel to make the display panel bend, thereby improving the warping problem of the display module.

[0009] In some embodiments, the internal stress energy storage structure comprises a plurality of through holes, and the plurality of through holes are arranged at the edges of the internal stress energy storage structure.

[0010] In some embodiments, the plurality of through holes are arranged at the four edges of the internal stress energy storage structure, and / or the plurality of through holes are arranged at the four corners of the internal stress energy storage structure.

[0011] In some embodiments, the opening shape of the through hole is a rhombus, a dumbbell shape, a capsule shape, an olive shape or an oval shape.

[0012] In some embodiments, the radius of curvature of the internal stress energy storage structure is greater than or equal to 200 mm.

[0013] In some embodiments, the modulus of the internal stress energy storage structure is in the range of 3Gpa-5Gpa.

[0014] In some embodiments, the optical adhesive layer includes a first part and a second part, the modulus of the first part is less than the modulus of the second part, and the first part covers at least the corner area of the display panel.

[0015] In some embodiments, the first part also covers the edge area of the display panel.

[0016] In some embodiments, the optical adhesive layer includes a plurality of first parts and a plurality of second parts, and the first parts and the second parts are alternately arranged around.

[0017] In some embodiments, the optical adhesive layer includes a plurality of first parts and a plurality of second parts, and the first parts and the second parts are alternately arranged around.

[0018] In some embodiments, the optical adhesive layer includes a plurality of first parts and a plurality of second parts, and the first parts and the second parts are alternately arranged around.

[0019] In some embodiments, the optical adhesive layer includes a plurality of first parts and a plurality of second parts, and the first parts and the second parts are alternately arranged around.

[0020] In some embodiments, the optical adhesive layer includes a plurality of first parts and a plurality of second parts, and the first parts and the second parts are alternately arranged around.

[0021] In some embodiments, the optical adhesive layer includes a plurality of first parts and a plurality of second parts, and the first parts and the second parts are alternately arranged around.

[0022] In some embodiments, the optical adhesive layer includes a plurality of first parts and a plurality of second parts, and the first parts and the second parts are alternately arranged around.

[0023] In the present application, the first part of the optical adhesive layer covers at least the corner area of the display panel, the modulus of the first part is less than that of the second part, the internal stress is transferred from the second part to the first part in the area where the first part and the second part contact, and the internal stress reaches internal balance in the stress storage area, thereby avoiding the internal stress from affecting the display panel and causing the display panel to bend, thereby improving the warping problem of the display module.

[0024] In some embodiments, the first part also covers the edge area of the display panel.

[0025] In some embodiments, the optical adhesive layer includes a plurality of first parts and a plurality of second parts, and the first parts and the second parts are alternately arranged around.

[0026] In the fourth aspect, the present application also provides another method for manufacturing a display module, including steps S21-S23:

[0027] Step S21: coating a first optical adhesive material and a second optical adhesive material on the display panel, and the first optical adhesive material covers at least the corner area of the display panel.

[0028] Step S22: attaching a cover plate, and the cover plate is located on the side of the first optical adhesive material and the second optical adhesive material away from the display panel.

[0029] Step S23: curing the first optical adhesive material to form a first part optical adhesive layer, and curing the second optical adhesive material to form a second part optical adhesive layer, and the modulus of the first part optical adhesive layer is less than that of the second part optical adhesive layer.

[0030] In some embodiments, the content of the photoinitiator in the first optical adhesive material is less than that in the second optical adhesive material, and / or the light intensity received by the first optical adhesive material is less than that received by the second optical adhesive material, and / or the time length of light received by the first optical adhesive material is less than that of the second optical adhesive material.

[0031] In the fifth aspect, the present application also provides a display device, which includes the display module in any of the embodiments of the first aspect and the third aspect and a housing, and the display module is located in the housing.

[0032] The display device has the same structure and beneficial technical effects as the display module provided in some embodiments described above, and will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the present application, the following will briefly introduce the drawings needed to be used in some embodiments of the present application. Obviously, the drawings described in the following description are only some drawings of the embodiments of the present application, and other drawings can also be obtained by those skilled in the art according to these drawings. In addition, the drawings in the following description can be regarded as schematic drawings, and are not the actual size of the product involved in the embodiments of the present application, or the actual flow of the method.

[0034] Figure 1 A structural schematic diagram of a display module provided by an embodiment of the present application is shown in the figure.

[0035] Figure 2 A schematic diagram of the stress situation of an internal stress energy storage structure is shown in the figure.

[0036] Figure 3 A structural schematic diagram of an internal stress energy storage structure provided by an embodiment of the present application is shown in the figure.

[0037] Figure 4 A structural schematic diagram of another display module provided by an embodiment of the present application is shown in the figure.

[0038] Figure 5 A structural schematic diagram of an optical adhesive layer provided by an embodiment of the present application is shown in the figure.

[0039] Figure 6 A structural schematic diagram of another optical adhesive layer provided by an embodiment of the present application is shown in the figure.

[0040] Figure 7 A flowchart of a preparation method of a display module provided by an embodiment of the present application is shown in the figure.

[0041] Figure 8 A structural schematic diagram of another display module provided by an embodiment of the present application is shown in the figure.

[0042] Figure 9 A flowchart of another preparation method of a display module provided by an embodiment of the present application is shown in the figure.

[0043] Figure 10 A structural schematic diagram of a display device provided by an embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0044] The technical solutions in some embodiments of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments provided by the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0045] Unless the context clearly requires otherwise, throughout the description and the claims, the word "comprise," and variations such as "comprises" or "comprising," will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integer or step. The use of the negative "not" in the context of the word "comprise" or "comprising" is intended to mean "not including" and "not containing" and "not comprising."

[0046] The terms "first", "second", and the like, as used herein do not imply either an importance or a relative importance between the named characters. The use of these terms is only to distinguish one element from another. The use of "a" or "an" herein, for example, means one or more. The use of "the" herein, for example, means the singular, a plural, both, or one or more.

[0047] In describing some embodiments, it will be understood that the terms "connected", "coupled", or "mounted" refer variously to fixed connections, detachable connections, or integrally formed connections, as well as mechanical or electrical connections, for example. In describing some embodiments, it will be understood that the terms "connected" or "coupled" can refer to either a direct connection or an indirect connection via an intermediate medium, for example. In describing some embodiments, it will be understood that the term "connected" or "coupled" can refer to either a direct physical contact or an electrical contact between two or more components.

[0048] In addition, the use of "based on" means open and inclusive, as the process, step, calculation, or other action based on one or more recited condition or value can be based on additional condition or values beyond those recited.

[0049] It will be understood that when a layer or element is referred to as being "on" another layer or substrate, it can be directly on the other layer or substrate, or intervening layers can also be present.

[0050] Exemplary embodiments are described herein with reference to cross-sectional illustrations that are idealized illustrations. In the drawings, the thickness of layers and regions are exaggerated for illustrative clarity. Accordingly, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and / or tolerances, are to be expected. Thus, the exemplary embodiments should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region illustrated as a rectangle will typically have rounded or curved features. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region of a device and are not intended to limit the scope of the exemplary embodiments.

[0051] At present, the electronic product has the problem of display module warping. According to the verification data collection of most medium and large size projects, the display module warping is mainly obvious in the cover plate bonding section. After the curing of the optical adhesive, the modulus of the adhesive material increases, which leads to the increase of the internal stress in the optical adhesive layer, and the internal stress is fed back to the display module, which forms the phenomenon that the four corner regions of the display module warp away from the cover plate. Since the optical adhesive is an indispensable link in the process, the warping problem is also unavoidable in the related structure.

[0052] Based on this, the application provides a display module, as shown in Figure 1 Figure 1 A structural schematic diagram of a display module provided by the embodiment of the application.

[0053] The display module 10 includes a display panel 11, an optical adhesive layer 12, an internal stress energy storage structure 13 and a cover plate 14.

[0054] The optical adhesive layer 12 is arranged on the display panel 11, the internal stress energy storage structure 13 is embedded in the optical adhesive layer 12, and the cover plate 14 is arranged on the side of the optical adhesive layer 12 away from the display panel 11. The shape of the internal stress energy storage structure 13 is arc-shaped, and the arc top of the internal stress energy storage structure 13 is concave towards the direction close to the display panel 11.

[0055] As shown in Figure 1 , the "arc shape" here means that the lower surface P1 and the upper surface P2 of the internal stress energy storage structure 13 are both arc surfaces. The arc top of the internal stress energy storage structure 13 is concave towards the direction close to the display panel 11. It can be understood that the ball center corresponding to the arc surface is located on the side of the internal stress energy storage structure 13 close to the cover plate 14.

[0056] The process of curing the optical adhesive material to form the optical adhesive layer 12 will generate internal stress, which causes the optical adhesive layer 12 to deform outward. Since the modulus of the cover plate 14 is relatively high, the internal stress is difficult to change the shape of the cover plate 14, and the direction of the internal stress is from the cover plate 14 to the display panel 11.

[0057] In the application, the internal stress energy storage structure 13 is made of an elastic and high light transmittance material, and the internal stress energy storage structure 13 is designed in an arc shape. By embedding the internal stress energy storage structure 13 in the optical adhesive layer 12, the internal stress of the optical adhesive layer can be concentrated near the edge of the internal stress energy storage structure 13.

[0058] As shown in Figure 2 Figure 2 A force receiving situation diagram of the internal stress energy storage structure.

[0059] ​​An internal stress energy storage structure 13 is embedded within an optical adhesive layer 12, dividing the optical adhesive layer 12 into a lower portion B1 near the display panel 11 and an upper portion B2 near the cover plate 14. The internal stress caused by the outward deformation of the optical adhesive layer 12 results in the upper portion B2 applying pressure FB2 to the internal stress energy storage structure 13, and the lower portion B1 applying tension FB1 to the internal stress energy storage structure 13. The resultant force of various forces acting on the internal stress energy storage structure 13 can be decomposed into a component force FH1 along the arc surface and a component force FH2 along the normal to the arc surface. The component force FH2 along the normal to the arc surface points from the cover plate 14 side towards the display panel 11 side. Typically, component force FH1 is smaller than component force FH2.

[0060] By rationally designing the shape of the internal stress energy storage structure 13, the internal stress of the optical adhesive layer 12 is ultimately absorbed by the internal stress energy storage structure 13. For example, the component force FH1 causes the internal stress energy storage structure 13 to tend to deform along the arc direction, and the component force FH2 causes the internal stress energy storage structure 13 to tend to deform along the arc normal direction from the cover plate 14 side to the display panel 11 side.

[0061] Because the curved surface of the internal stress energy storage structure 13 is concave from the cover plate 14 side towards the display panel 11 side, that is, the edge of the internal stress energy storage structure 13 is closer to the cover plate 14 than its central area. Based on this shape and the direction of the tensile force FB1 and the compressive force FB2, the component forces FH1 and FH2 mainly act on the edge of the internal stress energy storage structure 13, causing the internal stress energy storage structure 13 to deform with a smaller curvature of the curved structure.

[0062] The deformation trends of the internal stress energy storage structure 13 caused by the component forces FH1 and FH2 are absorbed by the internal stress energy storage structure 13. The internal stress energy storage structure 13 is used to offset the structural deformation caused by the optical adhesive layer 12, so that the surface of the optical adhesive layer 12 near the display panel 11 is relatively flat, avoiding edge or corner warping.

[0063] In other words, in this application, by setting the internal stress storage structure 13 to absorb the internal stress of the optical adhesive layer 12, the stress distribution in the optical adhesive layer 12 can be adjusted, and the internal stress of the optical adhesive layer 12 can be prevented from acting on the display panel 11 and causing the display panel 11 to bend, thereby improving the warping problem of the display module 10.

[0064] In some embodiments, such as Figure 3 As shown, Figure 3 This is a schematic diagram of an internal stress energy storage structure provided in an embodiment of this application.

[0065] like Figure 3 As shown, the internal stress energy storage structure 13 includes multiple through holes K1, which are disposed at the edge of the internal stress energy storage structure 13.

[0066] The edge here refers to a region located in the inner stress energy storage structure 13 and close to the boundary thereof, and corresponds to a region in the display module 10 where the warping problem is prone to occur.

[0067] In combination Figure 2 It can be seen that, for the resultant force of the inner stress energy storage structure 13, the component force FH1 makes the inner stress energy storage structure 13 tend to deform along the direction of the camber surface. The through hole K1 provides a deformation space for the deformation of the inner stress energy storage structure 13 along the direction of the camber surface, and the component force FH1 makes the via space of the through hole K1 be squeezed or stretched, that is, the component force FH1 can be absorbed by the through hole K1. In the case of deformation along the direction of the camber surface, the via space is squeezed or stretched, and neither the boundary of the inner stress energy storage structure 13 nor the boundary of the optical adhesive layer 12 is deformed, and the display module 10 does not deform along the surface direction of the cover plate 14.

[0068] For example, as shown in Figure 3 The plurality of through holes K1 are arranged on the four edges of the inner stress energy storage structure 13, or the plurality of through holes K1 are arranged on the four corners of the inner stress energy storage structure 13, or the plurality of through holes K1 are arranged on the four edges and the four corners of the inner stress energy storage structure 13.

[0069] The inner stress of the optical adhesive layer 12 is mainly concentrated in the edge region, that is, near the four edges and near the four corners, and the stress concentration near the four corners is more obvious, resulting in more obvious warping problem. Based on this, by arranging the through hole K1 in the corresponding region of the inner stress energy storage structure 13, the warping problem can be improved to the greatest extent, and the strength of the central region can also be ensured.

[0070] For example, as shown in

[0071] For example, as shown in Figure 3 For example, as shown in

[0072] Or, for example, the opening shape of the through hole K1 is dumbbell-shaped, capsule-shaped, olive-shaped or oval-shaped, the geometric lines are smooth, which is conducive to avoiding stress concentration, the length-width ratio is in the range of 8-10, the opening shape is center-symmetric and axis-symmetric along the width direction, and the force FH1 causes the via space of the through hole K1 to be squeezed or stretched along the width direction, which is conducive to absorbing the force FH1 and ensuring the structural stability of the internal stress energy storage structure 13.

[0073] In some embodiments, the curvature radius of the internal stress energy storage structure 13 is greater than or equal to 200 mm, for example, the curvature radius is 200 mm, 250 mm, 280 mm, 300 mm, 320 mm, etc. For example, the curvature radius of the internal stress energy storage structure 13 should not be too small, otherwise, under the condition that the size of the display module 10 is constant, the height of the internal stress energy storage structure 13 in the Z direction is large, which may cause the risk of reverse warping. For example, the height of the internal stress energy storage structure 13 in the Z direction is less than or equal to 0.5 mm, which can not only improve the warping problem of the corresponding product, but also avoid the risk of reverse warping caused by the internal stress energy storage structure 13.

[0074] In some embodiments, the thickness of the internal stress energy storage structure 13 along the normal direction of the curved surface is less than or equal to 0.15 mm, which is conducive to avoiding increasing the thickness of the display module 10 due to the setting of the internal stress energy storage structure 13, and is conducive to ensuring the lightweight design of the product.

[0075] In some embodiments, the modulus of the internal stress energy storage structure 13 is in the range of 3Gpa-5Gpa, for example, 3Gpa, 3.2Gpa, 3.5Gpa, 3.8Gpa, 4Gpa……5Gpa. For example, the modulus of the internal stress energy storage structure 13 is greater than that of the optical adhesive layer 12, the internal stress energy storage structure 13 is embedded in the optical adhesive layer 12, the internal stress of the optical adhesive layer 12 is concentrated near the edge of the internal stress energy storage structure 13, and the internal stress energy storage structure 13 absorbs the internal stress of the optical adhesive layer 12, thereby optimizing the stress distribution in the optical adhesive layer 12 and improving the warping problem of the display module 10.

[0076] In combination with Figure 2As shown, the component force FH2 makes the inner stress energy storage structure 13 have a deformation trend of reducing the curvature of the arc structure, and the energy storage capacity of the inner stress energy storage structure 13 is related to the curvature (radius of curvature) of the arc structure, the thickness of the inner stress energy storage structure 13, the modulus of the inner stress energy storage structure 13, and the like. By reasonably designing the above parameters, the warping problem can be greatly improved, and the product quality and thin design of the display module 10 can be ensured. For example, the radius of curvature of the inner stress energy storage structure 13 is positively correlated with the thickness of the inner stress energy storage structure 13. When the thickness of the inner stress energy storage structure 13 along the normal direction of the arc surface is 100 μm, the radius of curvature is designed to be greater than or equal to 250 mm. When the thickness of the inner stress energy storage structure 13 along the normal direction of the arc surface is 150 μm, the radius of curvature is designed to be greater than or equal to 200 mm.

[0077] In some embodiments, as Figures 4-6 shown, Figure 4 another structural schematic diagram of a display module provided by an embodiment of the present application, Figure 5 a structural schematic diagram of an optical adhesive layer provided by an embodiment of the present application, Figure 6 another structural schematic diagram of an optical adhesive layer provided by an embodiment of the present application.

[0078] As Figures 4-6 shown, the optical adhesive layer 12 includes a first part 121 and a second part 122. The modulus of the first part 121 is less than the modulus of the second part 122, and the first part 121 covers at least the corner region of the display panel 11.

[0079] Because the modulus of the first part 121 is less than the modulus of the second part 122, an inner stress buffering region is formed in the optical adhesive layer 12 at the part where the first part 121 and the second part 122 contact. The inner stress is transferred from the second part 122 to the first part 121, and internal balance is achieved in the stress buffering region, so that the inner stress can be prevented from acting on the inner stress energy storage structure 13, or the magnitude of the pulling force FB1 and the pressure FB2 applied to the inner stress energy storage structure 13 can be reduced, which is beneficial to relieving the energy storage pressure of the inner stress energy storage structure 13. That is, by utilizing the modulus distribution characteristics of the optical adhesive layer 12, the inner stress distribution is optimized, and the warping problem is improved.

[0080] For example, as Figure 5 shown, the first part 121 and the second part 122 are arranged in close contact in an “X” shape, and the arrangement pattern has symmetry. The inner stress of the second part 122 is transferred to the first part 121, internal balance is achieved in the stress buffering region, and the inner stress is more uniformly distributed in the optical adhesive layer 12, which is beneficial to improving the warping problem.

[0081] In some embodiments, as Figure 6As shown, the first part 121 also covers the edge area of ​​the display panel 11. The edge area here can be understood as the area near the boundary of the orthographic projection of the display panel 11.

[0082] As can be seen from the previous analysis, the four sides and four corners of the display panel 11 are prone to warping.

[0083] In this application, the first part 121 covers its edge and corner areas. The portion where the first part 121 and the second part 122 contact each other forms an internal stress buffer area. The internal stress is transferred from the second part 122 to the first part 121, achieving an internal balance effect in the stress buffer area. That is, it reduces the distribution of internal stress in the edge and corner areas, avoids the concentration of internal stress in the edge and corner areas, and helps to improve the warping problem.

[0084] For example, such as Figure 6 As shown, the optical adhesive layer 12 includes a plurality of first portions 121 and a plurality of second portions 122, which are alternately arranged around each other. Correspondingly, a plurality of annular internal stress buffer regions are formed in the optical adhesive layer 12, which is beneficial to further optimize the internal stress distribution, avoid internal stress concentration, and improve the warping problem.

[0085] Secondly, this application also provides a method for manufacturing a display module, such as... Figure 7 As shown, Figure 7 This is a flowchart illustrating a method for manufacturing a display module according to an embodiment of this application.

[0086] like Figure 7 As shown, the preparation method includes the following steps S11 to S13:

[0087] Step S11: Combining Figure 1 and Figure 4 Optical adhesive layers 12 are formed on opposite sides of the internal stress energy storage structure 13, and the internal stress energy storage structure 13 is arc-shaped.

[0088] Step S12: Combining Figure 1 and Figure 4 The internal stress energy storage structure 13 is attached to the display panel 11 through the optical adhesive layer 12, and the arc top of the internal stress energy storage structure 13 is concave inward toward the display panel 11.

[0089] Step S13: Combining Figure 1 and Figure 4 The cover plate 14 is attached to the display panel 11 through the optical adhesive layer 12. The cover plate 14 is located on the side of the internal stress energy storage structure 13 away from the display panel 11.

[0090] By the above preparation method, the internal stress energy storage structure 13 can be embedded in the optical adhesive layer 12, so that after the cover plate 14 is attached, the internal stress energy storage structure 13 absorbs the internal stress of the optical adhesive layer 12, offsets the structural deformation caused by the optical adhesive layer 12, and makes the surface of the optical adhesive layer 12 close to the display panel 11 relatively flat, avoiding edge or corner warping.

[0091] Generally, the optical adhesive layer 12 is formed by curing the raw material under light. Under the same light intensity and light duration, the lower the content of the photoinitiator in the raw material, the lower the curing degree after the curing process, that is, the smaller the modulus of the optical adhesive layer 12 finally formed. Similarly, under the same raw material and light intensity, the shorter the light duration, the smaller the modulus of the optical adhesive layer 12 finally formed. Under the same raw material and light duration, the lower the light intensity, the smaller the modulus of the optical adhesive layer 12 finally formed.

[0092] In some embodiments, the internal stress energy storage structure 13 includes a first region and a second region, the first region corresponds to the corner region of the display panel 11, and the optical adhesive layer 12 includes a first part 121 and a second part 122. It can be understood that the first region of the internal stress energy storage structure 13 corresponds to the first part 121 of the optical adhesive layer 12, and the second region of the internal stress energy storage structure 13 corresponds to the second part 122 of the optical adhesive layer 12.

[0093] The method for forming the optical adhesive layer 12 in step S11 includes: forming the first part 121 in the first region, and forming the second part 122 in the second region. The content of the photoinitiator in the first part 121 is less than the content of the photoinitiator in the second part 122. Here, the content of the photoinitiator refers to the content of the photoinitiator in the raw material used to form the first part 121 or the second part 122.

[0094] For example, different raw materials are respectively filled into different syringes, and an inkjet printing method is used to spray the raw material of the first part 121 in the first region, and at the same time, the raw material of the second part 122 is sprayed in the second region.

[0095] By setting the content of the photoinitiator in the raw material used for the first part 121 to be less than the content of the photoinitiator in the raw material used for the second part 122, the modulus of the first part 121 formed after the curing process can be made smaller than the modulus of the second part 122.

[0096] Similarly, by setting the light intensity received by the first part 121 to be less than the light intensity received by the second part 122, the modulus of the first part 121 formed after the curing process can also be made smaller than the modulus of the second part 122.

[0097] By setting the length of time that the first part 121 receives light to be less than the length of time that the second part 122 receives light, the modulus of the first part 121 formed after the curing process can also be made to be less than the modulus of the second part 122.

[0098] It can be understood that the above solutions can be used at the same time. In the optical adhesive layer 12 finally formed, the internal stress of the second part 122 is transferred to the first part 121, the stress is distributed near the boundary of the second part 122, and internal balance is achieved in the internal stress buffering area, thereby avoiding the internal stress from acting on the display panel 11, and thus the warping problem is improved.

[0099] In a third aspect, the present application also provides another display module, as shown in Figure 8 Figure 8 FIG. 6 is a structural schematic diagram of another display module provided by the embodiments of the present application.

[0100] As shown in Figure 8 , the display module 10 includes a display panel 11, an optical adhesive layer 12, and a cover plate 14. The optical adhesive layer 12 is arranged on the display panel 11, and the cover plate 14 is arranged on the side of the optical adhesive layer 12 away from the display panel 11. The optical adhesive layer 12 includes a first part 121 and a second part 122, the modulus of the first part 121 is less than the modulus of the second part 122, and the first part 121 at least covers the corner area of the display panel 11.

[0101] In the present application, the modulus of the optical adhesive layer 12 in different parts is adjusted to offset the structural deformation caused by the bonding process of the cover plate 14. For the corner part which is most prone to warping, the first part 121 of the optical adhesive layer 12 is arranged to at least cover the corner area of the display panel 11. Since the modulus of the first part 121 is less than the modulus of the second part 122, an internal stress buffering area is formed in the optical adhesive layer 12 at the part where the first part 121 and the second part 122 contact, the internal stress is transferred from the second part 122 to the first part 121, and internal balance is achieved in the stress buffering area. The internal stress can be avoided from acting on the display panel 11 to make the display panel 11 bend, thereby improving the warping problem of the display module 10.

[0102] In some embodiments, in combination with Figures 5-6 and Figure 8 As shown in FIG. 5, the first part 121 also covers the edge area of the display panel 11. The edge area here can be understood as the area close to the boundary of the orthographic projection of the display panel 11.

[0103] According to the foregoing analysis, since the internal stress of the optical adhesive layer 12 is concentrated in the edge area thereof, the four edges and the four corners of the display panel 11 are prone to warping problems.

[0104] ​In the present application, the first part 121 covers the edge area and the corner area, the part where the first part 121 and the second part 122 contact forms an internal stress buffering area, the internal stress is transferred from the second part 122 to the first part 121, and internal balance effect is achieved in the stress buffering area. That is, the distribution of internal stress in the edge area and the corner area is reduced, avoiding the concentration of internal stress in the edge area and the corner area, which is beneficial to improve the warping problem.

[0105] As shown in the example, Figure 6 The optical adhesive layer 12 includes a plurality of first parts 121 and a plurality of second parts 122, the first parts 121 and the second parts 122 are alternately arranged in a ring, and a plurality of annular internal stress buffering areas are formed in the optical adhesive layer 12, which is beneficial to further optimize the distribution of internal stress, avoid the concentration of internal stress, and improve the warping problem.

[0106] In a fourth aspect, the present application also provides another method for manufacturing a display module, as shown in the example, Figure 9 The method for manufacturing a display module provided by the present application is shown in another flowchart. Figure 9 The method for manufacturing a display module provided by the present application is shown in another flowchart.

[0107] As shown in the example, Figure 9 The method includes steps S21-S23:

[0108] Step S21: in combination Figures 5-6 And Figure 8 , a first optical adhesive material and a second optical adhesive material are coated on the display panel 11, and the first optical adhesive material covers at least the corner area of the display panel 11.

[0109] As an example, the first optical adhesive material and the second optical adhesive material are respectively filled into different syringes, and are sprayed according to a preset spraying pattern by using an inkjet printing method, so that the first optical adhesive material covers at least the corner area of the display panel 11.

[0110] Step S22: in combination Figure 8 , the cover plate 14 is attached, and the cover plate 14 is located on the side of the first optical adhesive material and the second optical adhesive material away from the display panel 11.

[0111] Step S23: in combination Figure 8 , the first optical adhesive material is cured to form a first part optical adhesive layer 121, and the second optical adhesive material is cured to form a second part optical adhesive layer 122, and the modulus of the first part optical adhesive layer 121 is less than the modulus of the second part optical adhesive layer 122.

[0112] The preparation method is simple in operation, and the first optical adhesive layer 121 and the second optical adhesive layer 122 are formed by solidification and have different moduli. For example, the modulus of the first optical adhesive layer 121 is less than or equal to 80 Kpa, and the modulus of the second optical adhesive layer 122 is greater than or equal to 150 Kpa.

[0113] Due to the different moduli, the part where the first optical adhesive layer 121 and the second optical adhesive layer 122 contact forms an internal stress buffering area, the internal stress is transferred from the second optical adhesive layer 122 to the first optical adhesive layer 121, and internal balance is achieved in the stress buffering area. That is, it is beneficial to reduce the distribution of internal stress in the edge area and the corner area, avoid the concentration of internal stress in the edge area and the corner area, and improve the warping problem.

[0114] For example, the content of the photoinitiator in the first optical adhesive material is less than the content of the photoinitiator in the second optical adhesive material, so that after solidification, the modulus of the first optical adhesive layer 121 is less than the modulus of the second optical adhesive layer 122. Similarly, the light intensity received by the first optical adhesive material is less than the light intensity received by the second optical adhesive material, which can also make the modulus of the first optical adhesive layer 121 less than the modulus of the second optical adhesive layer 122. The duration of the first optical adhesive material receiving light is less than the duration of the second optical adhesive material receiving light, which can also make the modulus of the first optical adhesive layer 121 less than the modulus of the second optical adhesive layer 122.

[0115] In the finally formed optical adhesive layer 12, the internal stress of the second part 122 is transferred to the first part 121, the stress is distributed near the boundary of the second part 122, the internal balance effect is achieved in the internal stress buffering area, and the internal stress is avoided to act on the display panel 11, thereby improving the warping problem.

[0116] In a fifth aspect, the present application also provides a display device, which comprises the display module 10 and the shell 21. Figure 10 As shown in the figure, Figure 10 The display device provided by the embodiment of the present application is a structure schematic diagram of a display device.

[0117] The display device 20 comprises the display module 10 and the shell 21 in any one of the embodiments of the first aspect and the third aspect, and the display module 10 is located in the shell 21.

[0118] The optical adhesive layer 12 of the display module 10 is embedded with the internal stress energy storage structure 13, the internal stress of the optical adhesive layer 12 is absorbed by the internal stress energy storage structure 13, the structural deformation caused by the optical adhesive layer 12 is offset by the internal stress energy storage structure 13, the surface of the optical adhesive layer 12 close to the display panel 11 is relatively flat, and the edge or corner warping is avoided.

[0119] Alternatively, the optical adhesive layer 12 of the display module 10 comprises a first part 121 and a second part 122, the modulus of the first part 121 is less than that of the second part 122, the first part 121 covers at least the corner area of the display panel 11, and an internal stress buffering area is formed at the part where the first part 121 and the second part 122 contact inside the optical adhesive layer 12, the internal stress is transferred from the second part 122 to the first part 121, and the internal stress buffering area reaches internal balance effect, avoiding the internal stress from acting on the display panel 11, thereby being beneficial to improve the warping problem.

[0120] Based on this, the warping problem of the display device 20 is also improved, which is beneficial to improve the product performance and product evaluation.

[0121] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A display module, characterized by The display panel comprises: An optical adhesive layer arranged on the display panel; An internal stress energy storage structure comprising an elastic material, which is embedded in the optical adhesive layer; The internal stress energy storage structure is arc-shaped, and the vertex of the arc-shaped internal stress energy storage structure is concave towards the display panel; The internal stress energy storage structure comprises a plurality of through holes arranged at the edges of the internal stress energy storage structure; A cover plate arranged on the side of the optical adhesive layer away from the display panel.

2. The display module of claim 1, wherein, The plurality of through holes are arranged at the four edges of the internal stress energy storage structure; and / or The plurality of through holes are arranged at the four corners of the internal stress energy storage structure.

3. The display module of claim 1, wherein, The opening shape of the through holes is rhombus, dumbbell, capsule, olive or ellipse.

4. The display module of claim 1, wherein, The radius of curvature of the internal stress energy storage structure is greater than or equal to 200 mm.

5. The display module of claim 1, wherein, The modulus of the internal stress energy storage structure is in the range of 3 Gpa-5 Gpa. 6.The display module of any one of claims 1-5, wherein, The optical adhesive layer comprises a first part and a second part, and the modulus of the first part is less than that of the second part; The first part covers at least the corner area of the display panel.

7. The display module of claim 6, wherein, The first part also covers the edge area of the display panel.

8. The display module of claim 7, wherein, The optical adhesive layer comprises a plurality of first parts and a plurality of second parts, and the first parts and the second parts are arranged alternately.

9. A method for manufacturing a display module, characterized by, The display panel comprises: An optical adhesive layer formed on the opposite sides of an internal stress energy storage structure, which comprises an elastic material and is embedded in the optical adhesive layer; The internal stress energy storage structure is arc-shaped, and the internal stress energy storage structure comprises a plurality of through holes arranged at the edges of the internal stress energy storage structure; The internal stress energy storage structure is pasted on the display panel through the optical adhesive layer, and the vertex of the arc-shaped internal stress energy storage structure is concave towards the display panel; A cover plate is pasted on the display panel through the optical adhesive layer, and the cover plate is located on the side of the internal stress energy storage structure away from the display panel.

10. The method of claim 9, wherein, The internal stress energy storage structure comprises a first area and a second area, and the first area corresponds to the corner area of the display panel; The optical adhesive layer comprises a first part and a second part, and the optical adhesive layer is formed by: Forming the first part in the first area and the second part in the second area; The content of the photoinitiator in the first part is less than that in the second part; and / or The light intensity received by the first part is less than that received by the second part; and / or The duration of light received by the first part is less than that received by the second part.

11. A display device, characterized by comprising: The display module comprises a display module and a housing according to any one of claims 1-8; The display module is located in the housing.

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