Display module, preparation method thereof and display device

Abstract

The display module, the preparation method thereof and the display device are provided. The display panel comprises a cover plate, an ink layer, a first adhesive layer, a second adhesive layer and a display panel. The cover plate comprises a flat area and a curved area surrounding at least part of the flat area. The ink layer is located on one side of the cover plate and is at least partially arranged in the curved area of the cover plate. The ink layer is arranged in a circumferential direction of the cover plate and forms a cavity. The first adhesive layer fills the cavity. The second adhesive layer is located on the side of the first adhesive layer away from the cover plate and covers at least part of the ink layer. The storage modulus of the second adhesive layer is greater than or equal to 500 kPa. The display panel is located on the side of the second adhesive layer away from the cover plate. The storage modulus of the second adhesive layer is high, which can reduce the deformation of the second adhesive layer during the bonding of the display panel and the cover plate, and improve the anti-mold ability of the display module.

Description

TECHNICAL FIELD

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

[0002] Organic Light-Emitting Diode (OLED) display panel 40 has been widely used due to its high brightness, low power consumption, fast response and low driving voltage.

[0003] However, the use performance of the current OLED display product needs to be improved. SUMMARY

[0004] Therefore, the purpose of the present disclosure is to provide a display module, a preparation method thereof and a display device, which has strong resistance to moulage.

[0005] To achieve the above purpose, the present disclosure provides a display module, which comprises:

[0006] a cover plate, the cover plate comprising a flat area and a curved area surrounding at least part of the flat area;

[0007] an ink layer located on one side of the cover plate and at least partially disposed in the curved area of the cover plate, the ink layer being circumferentially disposed around the cover plate and enclosing a cavity;

[0008] a first adhesive layer, the first adhesive layer filling the cavity;

[0009] a second adhesive layer, the second adhesive layer being located on the side of the first adhesive layer away from the cover plate and covering at least part of the ink layer, the storage modulus of the second adhesive layer being greater than or equal to 500 kPa;

[0010] a display panel located on the side of the second adhesive layer away from the cover plate.

[0011] In an embodiment, the material of the first adhesive layer comprises liquid optical glue.

[0012] Preferably, the first adhesive layer is formed by curing the liquid optical glue.

[0013] In an embodiment, the storage modulus of the first adhesive layer is less than the storage modulus of the second adhesive layer.

[0014] Preferably, the storage modulus of the first adhesive layer is less than or equal to 100 kPa.

[0015] Preferably, the material of the first adhesive layer comprises solid optical glue, and the material of the second adhesive layer comprises solid optical glue.

[0016] In an embodiment, the sidewall of the first adhesive layer is attached to the sidewall of the ink layer close to the side of the flat area.

[0017] In an embodiment, the thickness of the first adhesive layer is 0.98-1.02 times the thickness of the ink layer in the direction perpendicular to the cover plate.

[0018] In an embodiment, the thickness of the second adhesive layer is less than or equal to 100 microns in the direction perpendicular to the cover plate.

[0019] Preferably, the recovery of the second adhesive layer is greater than or equal to 98%.

[0020] In an embodiment, the display module further comprises a polarizer, the polarizer is located between the second adhesive layer and the display panel, and the polarizer extends from the flat area to the curved area.

[0021] Based on the same inventive concept, the disclosure also provides a method for manufacturing a display module, comprising the following steps:

[0022] providing a cover plate, the cover plate comprising a flat area and a curved area connected to the flat area;

[0023] forming an ink layer on the cover plate, at least part of the ink layer is located in the curved area, the ink layer is arranged circumferentially around the cover plate and forms a cavity;

[0024] forming a first adhesive layer and a second adhesive layer on the cover plate, wherein the first adhesive layer fills the cavity, the second adhesive layer is located on the side of the first adhesive layer away from the cover plate, and covers at least part of the ink layer;

[0025] providing a display panel, the display panel is attached to the side of the second adhesive layer away from the cover plate.

[0026] In an embodiment, the step of forming a first adhesive layer and a second adhesive layer on the cover plate comprises

[0027] The step of forming a first adhesive layer and a second adhesive layer on the cover plate comprises:

[0028] coating a liquid first adhesive glue in the cavity, and pre-solidifying the liquid first adhesive glue,

[0029] providing a second adhesive layer, attaching the second adhesive layer to the side of the pre-solidified liquid first adhesive glue away from the cover plate, and solidifying the pre-solidified liquid first adhesive glue to form the first adhesive layer, so that the second adhesive layer is attached to the cover plate, or

[0030] providing a second adhesive layer, coating a liquid first adhesive glue on the second adhesive layer, and pre-solidifying the liquid first adhesive glue;

[0031] attaching the second adhesive layer corresponding to the pre-solidified liquid first adhesive glue to the cover plate, and making the pre-solidified liquid first adhesive glue be located in the cavity, and solidifying the pre-solidified liquid first adhesive glue to form the first adhesive glue layer, so that the second adhesive layer is attached to the cover plate, or

[0032] providing a first adhesive layer, and arranging the first adhesive layer in the cavity,

[0033] providing a second adhesive layer, and attaching the second adhesive layer to a side of the first adhesive layer away from the cover plate, or

[0034] providing a second adhesive layer and a first adhesive layer, and attaching the first adhesive layer to the second adhesive layer;

[0035] attaching a side of the first adhesive glue away from the second adhesive layer to the cover plate, and making the first adhesive layer be located in the cavity.

[0036] Based on the same inventive concept, the present disclosure provides a display device comprising the display module described above.

[0037] Compared with the prior art, the display module provided by the present disclosure has a second adhesive layer with a higher storage modulus, which can reduce the deformation of the second adhesive layer during the attachment of the display panel and the cover plate, and improve the anti-mold ability of the display module. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the present disclosure or the related art, the following will briefly introduce the drawings needed to be used in the embodiments or related art descriptions. Obviously, the drawings in the following description are only embodiments of the present disclosure, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0039] Figure 1 a partial cross-sectional view of a display module in the prior art;

[0040] Figure 2 a planar structure schematic view of a display module provided by an embodiment of the present disclosure;

[0041] Figure 3 a partial cross-sectional view of a display module provided by an embodiment of the present disclosure;

[0042] Figure 4A flowchart of a manufacturing method of a display module is provided for the embodiments of the present application. DETAILED DESCRIPTION

[0043] For the purpose of making the objectives, technical solutions and advantages of the present disclosure clearer, the present disclosure is further described in detail below with reference to the embodiments and the accompanying drawings.

[0044] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood as the common meanings understood by those skilled in the art to which the present disclosure belongs. The terms "first", "second" and similar terms used in the embodiments of the present disclosure do not represent any order, quantity or importance, but are only used to distinguish different components. The terms "include", "contain" and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0045] In the process of implementing the present application, the inventors found that the related art has the following problems. Due to the design requirements of the narrow edge of the display module, the cover plate 100 is bent in the edge area, such as the commonly used 3D double-curved and four-curved display modules, as shown in the prior art. Figure 1 As shown in the prior art, the display module includes a cover plate 100, an ink layer 200, an optical adhesive (OCA) 300 and a display panel 400. The cover plate 100 has a flat area AA and a curved area FAA arranged adjacent to each other. The ink layer 200 is located on one side of the cover plate 100 and in the curved area FAA. The ink layer surrounds to form a cavity 110. The optical adhesive (OCA) 300 fills the cavity 110 and extends along the side wall of the ink layer 200 away from the cover plate 100 to the side of the ink layer 200 away from the cover plate 100. The display panel 400 is arranged on the side of the optical adhesive away from the cover plate 100. In the process of the bonding process, on the one hand, the surface of the cover plate 100 close to the display panel 400, the side wall of the ink layer 200 close to the flat area AA and the bonding layer will generate a gap, and the gap is prone to generate bonding bubbles. On the other hand, the conventional optical adhesive (OCA) is a material with low modulus before UV and thick thickness (such as 150 um). In the bonding process, the optical adhesive (OCA) is compressed and thinned with a large deformation, especially at the curved area FAA. Due to the compression and thinning of the edge thickness of the optical adhesive (OCA), the screen body has different reflection in the arc area, which causes the arc area to be imprinted. At the same time, the optical adhesive (OCA) material is thick, and the anti-imprinting performance is poor.

[0046] Based on the above reasons, the display module provided by the present application has strong resistance to mold printing.

[0047] Next, the display module provided by the first aspect of the present application will be described in combination with Figures 2-3 The display module includes a cover plate 10, an ink layer 20, a first adhesive layer 31, a second adhesive layer 32, and a display panel 40. The cover plate 10 includes a flat area AA and a curved area FAA surrounding at least part of the flat area AA. The ink layer 20 is located on one side of the cover plate 10 and at least partially in the curved area FAA of the cover plate 10. The ink layer 20 is circumferentially arranged around the cover plate 10 and encloses a cavity 11. The first adhesive layer 31 fills the cavity 11. The second adhesive layer 32 is located on the side of the first adhesive layer 31 away from the cover plate 10 and covers at least part of the ink layer 20. The storage modulus of the second adhesive layer 32 is greater than or equal to 500 kPa. The display panel 40 is located on the side of the second adhesive layer 32 away from the cover plate 10. In the present application, the storage modulus of the second adhesive layer 32 is high, which can reduce the deformation of the second adhesive layer 32 during the lamination of the display panel 40 and the cover plate 10, and improve the resistance of the display module to mold printing.

[0048] In the present application, the cover plate 10 includes a double-curved cover plate 10 or a four-curved cover plate 10. The cover plate 10 can be a curved rigid cover plate 10. The cover plate 10 includes a transparent substrate, and the curved cover plate 10 includes a flat area AA and a curved area FAA surrounding at least part of the flat area AA. The curved area FAA can be arc-shaped. The flat area AA is arranged in the main display area. The curved area FAA is arranged in the curved display area. The curved area FAA can surround at least part of the flat area AA. Specifically, the curved area FAA can be arranged around the circumferential edge of the flat area AA. For example, the curved area FAA can be arranged around the circumferential edge of the flat area AA once, and form an inner recess structure together with the flat area AA. The transparent substrate is formed of glass (Glass), polymethyl methacrylate (PMMA), polycarbonate (PC), etc.

[0049] The display panel 40 includes a flexible display panel 40, which has a display surface and a back surface opposite to each other. The cover plate 10 is specifically arranged on the side of the display surface of the display panel 40. The display panel 40 is used to display a picture during work. The display panel 40 specifically includes a flat area AA and a curved area FAA surrounding at least part of the flat area AA. The flat area AA can be arranged in the main display area, and the curved part can be arranged in the curved display area. The curved part can be arc-shaped. During work, both the flat area AA and the curved part of the display panel 40 can display a picture, so as to realize 3D display of the display module.

[0050] The oil film layer 20 is arranged on one side of the cover plate 10 and in the curved area FAA of the cover plate 10, that is, the oil film layer surrounds the flat area AA of the cover plate 10 to form a ring, so as to absorb the light emitted from the display area and reflected to the edge of the cover plate 10, thereby preventing light leakage at the edge of the cover plate 10. Further, the orthographic projection of the oil film layer 20 on the cover plate 10 covers at least part of the curved area FAA of the cover plate 10.

[0051] In an embodiment, the first adhesive layer 31 comprises liquid optical glue, and the second adhesive layer 32 comprises solid optical glue. The first adhesive layer 31 is formed by curing the liquid optical glue filled in the cavity 11. In this embodiment, since the first adhesive layer 31 is in a liquid state in the initial state, the liquid optical glue with high flowability is used to absorb the topography tolerance between the cover plate 10 and the ink layer 20, thereby reducing the possibility of defects such as bonding wrinkles and cracks at the cavity 11 formed by bonding the cover plate 10 and the ink layer 20. Therefore, the liquid optical glue has good bonding with the edge of the ink layer 20, and wrinkles are not easy to occur during molding, which can effectively fill the gap between the cover plate 10 and the oil film layer.

[0052] In another embodiment, the first adhesive layer 31 comprises solid optical glue, and the second adhesive layer 32 comprises solid optical glue. The storage modulus of the first adhesive layer 31 is less than the storage modulus of the second adhesive layer 32. Further, the storage modulus of the first adhesive layer 31 is less than or equal to 100 kilopascals. In this embodiment, in the initial state of the first adhesive layer 31 (i.e., when the display panel 40 and the cover plate 10 are not pressed), the side surface of the first adhesive layer 31 close to the ink layer 20 is arranged obliquely, so that the side wall of the ink layer 20 close to the flat area AA, the surface of the cover plate 10 close to the display panel 40, and the first adhesive layer 31 together enclose a space. Since the first adhesive layer 31 in this embodiment is optical glue with ultra-low storage modulus, the first adhesive layer 31 will deform and fill the gap during the pressing of the cover plate 10 and the display panel 40, so that the side wall of the first adhesive layer 31 can be well bonded with the side wall of the oil film layer, avoiding the formation of a gap and solving the 3D bonding bubble problem.

[0053] In a specific embodiment, the side wall of the first adhesive layer 31 is bonded with the inner side wall of the ink layer 20. Further, in the direction perpendicular to the cover plate 10, the thickness ratio of the first adhesive layer 31 to the ink layer 20 is between 0.98 and 1.02, that is, the thickness of the first adhesive layer 31 is the same as or approximately the same as the thickness of the ink layer 20, so as to avoid the generation of a gap between the first adhesive layer 31 and the ink layer 20 and solve the 3D bonding bubble problem.

[0054] In an embodiment, the second adhesive layer 32 has a high recovery (also referred to as elastic recovery, which refers to the ability of a material to recover to its original shape after being stressed), and the recovery of the second adhesive layer 32 is greater than or equal to 98%, that is, the second adhesive layer 32 has a high cohesive force, which can reduce the deformation of the second adhesive layer 32 during the bonding process, avoid the thickness of the second adhesive layer 32 located in the curved area FAA being compressed, and reduce the thickness of the entire display module. The thickness of the second adhesive layer 32 is relatively small, which not only reduces the thickness of the entire display module, but also improves the anti-molding ability of the display module. However, the thickness of the second adhesive layer 32 cannot be too small, because if the thickness of the second adhesive layer 32 is too small, the adhesion of the second adhesive layer 32 will be affected. Therefore, the thickness of the second adhesive layer 32 is greater than or equal to 50 microns and less than or equal to 100 microns (for example, the thickness of the second adhesive layer 32 is 50 microns, 55 microns, 60 microns, 65 microns, 70 microns, 75 microns, 80 microns, 85 microns, 90 microns, 95 microns, or 100 microns).

[0055] In an embodiment, the display module further comprises a polarizer located between the second adhesive layer 32 and the display panel 40. The polarizer blocks the reflection of external light and avoids the interference of reflected light on the surface of the display panel 40, so as to ensure that the display panel 40 has a high contrast ratio. Further, the polarizer extends from the flat area AA to the curved area FAA, and the orthographic projection of the polarizer on the substrate at least covers part of the ink layer.

[0056] The second aspect of the present disclosure provides a preparation method of a display module, which specifically comprises the following steps:

[0057] A cover plate 10 is provided, which comprises a flat area AA and a curved area FAA connected to the flat area AA;

[0058] An ink layer 20 is formed on one side of the cover plate 10, and at least part of the ink layer 20 is located in the curved area FAA. The ink layer 20 is circumferentially arranged around the cover plate 10 and encloses a cavity 11;

[0059] A first adhesive layer 31 and a second adhesive layer 32 are formed on one side of the cover plate 10. The first adhesive layer 31 fills the cavity 11, and the second adhesive layer 32 is located on the side of the first adhesive layer 31 away from the cover plate 10 and covers at least part of the ink layer 20;

[0060] A display panel 40 is provided, which is bonded to the side of the second adhesive layer 32 away from the cover plate 10.

[0061] In a specific embodiment, the step of forming the first adhesive layer 31 and the second adhesive layer 32 on the cover plate 10 comprises:

[0062] When the first adhesive layer 31 comprises liquid optical glue, the liquid optical glue can be directly coated in the cavity 11 enclosed by the ink layer 20, the liquid optical glue is pre-cured, and then the second adhesive layer 32 is attached on the pre-cured liquid optical glue. The specific steps are as follows:

[0063] The liquid first adhesive glue (optical glue) is coated in the cavity 11, and the liquid first adhesive glue (optical glue) is pre-cured;

[0064] For example, after the liquid first adhesive glue (optical glue) is coated, a curing device such as an ultraviolet lamp (uv lamp) can be used to pre-cure the liquid first adhesive glue coated on one side of the curved display panel 40, thereby forming a semi-flowing state of the attached glue. This step can also be referred to as pre-hardening of the liquid first adhesive glue.

[0065] The second adhesive layer 32 is provided, the second adhesive layer 32 is attached on the side of the pre-cured liquid first adhesive glue away from the cover plate 10, and the pre-cured liquid first adhesive glue is cured to form the first adhesive glue layer 31, so that the second adhesive layer 31 is attached to the cover plate 10.

[0066] When the first adhesive layer 31 comprises liquid optical glue, the liquid first adhesive glue (optical glue) can be coated on the first adhesive layer 31 and pre-cured first, and then the second adhesive layer 32 and the pre-cured liquid optical glue are attached on the cover plate 10. The specific steps are as follows:

[0067] The second adhesive layer 32 is provided, the liquid first adhesive glue (optical glue) is coated on the second adhesive layer 32, and the liquid first adhesive glue (optical glue) is pre-cured;

[0068] For example, after the liquid first adhesive glue (optical glue) is coated, a curing device such as an ultraviolet lamp (uv lamp) can be used to pre-cure the liquid optical glue material coated on one side of the curved display panel 40, thereby forming a semi-flowing state of the attached glue. This step can also be referred to as pre-hardening of the liquid first adhesive glue (optical glue).

[0069] The second adhesive layer 32 is attached to the cover plate 10 corresponding to the side of the pre-cured liquid first adhesive glue, wherein the pre-cured liquid first adhesive glue is located in the cavity, and the pre-cured liquid first adhesive glue is cured to form the first adhesive glue layer 31, so that the second adhesive layer 32 is attached to the cover plate 10.

[0070] When the first adhesive layer 31 comprises a solid optical adhesive, the solid optical adhesive with low storage modulus can be directly attached in the cavity 11, and then the second adhesive layer 32 is attached on the first adhesive layer 31. The specific steps are as follows:

[0071] The first adhesive layer 31 is provided and arranged in the cavity 11,

[0072] The second adhesive layer 32 is provided and attached on the side of the first adhesive layer 31 away from the cover plate 10.

[0073] When the first adhesive layer 31 comprises a solid optical adhesive, the solid optical adhesive with low storage modulus can be first attached on the second adhesive layer 32, and then the second adhesive layer 32 and the first adhesive layer 31 (the solid optical adhesive with low storage modulus) are attached on the cover plate 10 together. The specific steps are as follows:

[0074] The first adhesive layer 31 and the second adhesive layer 32 are provided, and the first adhesive layer 31 is attached on the second adhesive layer 32;

[0075] The side of the first adhesive layer 31 away from the second adhesive layer 32 is attached to the cover plate 10, and the first adhesive layer 31 is located in the cavity 11.

[0076] The third aspect of the present disclosure provides a display device, which comprises the display module in any of the above embodiments. The display device can be a mobile phone, a computer, a television, a smart wearable display device, etc. The embodiments of the present disclosure do not make special limitations on this. The display device has the same beneficial effects as the display panel 40. Details are not repeated here.

[0077] It should be noted that the above describes some embodiments of the present disclosure. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different than the order described in the above embodiments and still achieve the desired result. In addition, the processes depicted in the figures do not necessarily require the particular order shown or sequential order to achieve the desired results. In certain implementations, multitasking and parallel processing can be advantageous or possible.

[0078] The embodiments of the present disclosure are intended to cover all such alternatives, modifications, and variations of the present disclosure falling within the broad scope of the appended claims. Accordingly, any and all such modifications, variations, omissions, and equivalents are intended to be encompassed by the present disclosure.

Claims

1. A display module, characterized by The display module comprises: a cover plate, the cover plate comprising a flat area and a curved area surrounding at least part of the flat area; an ink layer, located on one side of the cover plate, and at least partially disposed in the curved area of the cover plate, the ink layer being circumferentially disposed around the cover plate and enclosing a cavity; a first adhesive layer, the first adhesive layer filling the cavity; a second adhesive layer, the second adhesive layer being located on the side of the first adhesive layer away from the cover plate and covering at least part of the ink layer, the second adhesive layer having a storage modulus greater than or equal to 500 kPa; the material of the first adhesive layer comprising liquid optical glue, and the first adhesive layer being formed by curing the liquid optical glue, or the material of the first adhesive layer comprising solid optical glue, the first adhesive layer having a storage modulus less than that of the second adhesive layer; a display panel, located on the side of the second adhesive layer away from the cover plate.

2. The display module of claim 1, wherein: the material of the second adhesive layer comprises solid optical glue, and the first adhesive layer has a storage modulus less than or equal to 100 kPa.

3. The display module of claim 1, wherein: the side wall of the first adhesive layer is in contact with the inner side wall of the ink layer.

4. The display module of claim 1, wherein: in the direction perpendicular to the cover plate, the thickness ratio of the first adhesive layer to the ink layer is between 0.98 and 1.

02.

5. The display module of claim 1, wherein: in the direction perpendicular to the cover plate, the thickness of the second adhesive layer is less than or equal to 100 microns.

6. The display module of claim 1, wherein: the recovery of the second adhesive layer is greater than or equal to 98%.

7. The display module of claim 1, further comprising a polarizer, the polarizer being located between the second adhesive layer and the display panel, the polarizer extending from the flat area to the curved area. The display module comprises the following steps:

8. A manufacturing method of a display module, characterized by comprising: providing a cover plate, the cover plate comprising a flat area and a curved area connected to the flat area; forming an ink layer on the cover plate, at least part of the ink layer being located in the curved area, the ink layer being circumferentially disposed around the cover plate and enclosing a cavity; forming a first adhesive layer and a second adhesive layer on the cover plate, wherein the first adhesive layer fills the cavity, the second adhesive layer being located on the side of the first adhesive layer away from the cover plate and covering at least part of the ink layer, the material of the first adhesive layer comprising liquid optical glue, and the first adhesive layer being formed by curing the liquid optical glue, or the material of the first adhesive layer comprising solid optical glue, the first adhesive layer having a storage modulus less than that of the second adhesive layer; providing a display panel, the display panel being in contact with the side of the second adhesive layer away from the cover plate.

9. The manufacturing method of claim 8, wherein: the step of forming a first adhesive layer and a second adhesive layer on the cover plate comprises: applying liquid first adhesive glue in the cavity, and pre-curing the liquid first adhesive glue, ​ providing a second adhesive layer, and adhering the second adhesive layer to a side of the pre-solidified liquid first adhesive away from the cover plate, and solidifying the pre-solidified liquid first adhesive to form the first adhesive layer, so that the second adhesive layer is adhered to the cover plate, or providing a second adhesive layer, and coating the second adhesive layer with a liquid first adhesive, and pre-solidifying the liquid first adhesive; adhering a side of the second adhesive layer corresponding to the pre-solidified liquid first adhesive to the cover plate, and positioning the pre-solidified liquid first adhesive in the cavity, and solidifying the pre-solidified liquid first adhesive to form the first adhesive layer, so that the second adhesive layer is adhered to the cover plate, or providing a first adhesive layer, and positioning the first adhesive layer in the cavity, providing a second adhesive layer, and adhering the second adhesive layer to a side of the first adhesive layer away from the cover plate, or providing a second adhesive layer and a first adhesive layer, and adhering the first adhesive layer to the second adhesive layer; adhering a side of the first adhesive layer away from the second adhesive layer to the cover plate, and positioning the first adhesive layer in the cavity.

10. A display device, characterized by comprising: The display device comprises the display module according to any one of claims 1-7.

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