Display module and manufacturing method therefor, and display apparatus

Abstract

Disclosed are a display module (100) and a manufacturing method therefor, and a display apparatus. The display module comprises a display panel (10), a cover plate (20), and a first adhesive layer (30) and a second adhesive layer (40) located therebetween; the first adhesive layer (30) and the second adhesive layer (40) are at least arranged in corner sub-regions (102b) of the display module (100); the first adhesive layer (30) is in contact with the cover plate (20); the surface of the side of the second adhesive layer (40) close to the cover plate (20) is in contact with the surface of the side of the first adhesive layer (30) away from the cover plate (20); and the curing rate of the first adhesive layer (30) is greater than or equal to the curing rate of the second adhesive layer (40).

Description

Display module, manufacturing method thereof, and display device Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display module, a manufacturing method thereof, and a display device. Background Art

[0002] As electronic devices pursue the development trend of the ultimate full screen, display screens (such as mobile phones) are emerging in the market in an endless stream. In pursuit of the diversification of the appearance of display devices, the cover of the display screen has developed from double-curved surfaces on the left and right sides to curved surfaces on all sides or fully curved forms.

[0003] Curved screens include dual-curved screens, where two opposing sides of the display have a certain curvature, and quad-curved screens, where all four sides of the display have a certain curvature. Quad-curved screens are typically formed by laminating a display panel with a curved cover. The intersection of two adjacent curved edges in a quad-curved screen forms a Gaussian surface, which is prone to bubbles after lamination. SUMMARY OF THE INVENTION

[0004] The present application provides a display module and a manufacturing method thereof, and a display device to alleviate the technical problem that the Gaussian surface of the existing four-curved screen is prone to bubbles after bonding.

[0005] To solve the above problem, the technical solution provided by this application is as follows:

[0006] The present application provides a display module, comprising a planar area and a curved area located outside the planar area, wherein the curved area comprises a plurality of side sub-areas located around the planar area and a corner sub-area located between two adjacent side sub-areas. The display module comprises:

[0007] Display panel;

[0008] a cover plate, disposed on one side of the display panel; and

[0009] a first adhesive layer, located between the display panel and the cover plate, the first adhesive layer being provided at least in the corner sub-region, and the first adhesive layer being in contact with the cover plate;

[0010] a second adhesive layer, located between the display panel and the cover plate, the second adhesive layer being provided at least in the corner sub-region, and a surface of the second adhesive layer close to the cover plate being in contact with the first adhesive layer;

[0011] Wherein, the curing rate of the first adhesive layer is greater than or equal to the curing rate of the second adhesive layer.

[0012] The present application also proposes a method for manufacturing a display module, comprising a planar region and a curved region located outside the planar region, wherein the curved region comprises a plurality of side sub-regions located around the planar region and a corner sub-region located between two adjacent side sub-regions. The method for manufacturing the display module comprises:

[0013] providing a cover plate;

[0014] forming a first adhesive layer on a side of the cover plate away from the light-emitting surface of the display module, and performing a curing process on the first adhesive layer, wherein the first adhesive layer is at least provided in the corner sub-region;

[0015] Providing a display panel, forming a second adhesive layer on a side of the display panel close to the light-emitting surface of the display module, wherein the second adhesive layer is at least provided in the corner sub-region;

[0016] bringing a surface of the second adhesive layer away from the display panel into contact with a surface of the first adhesive layer away from the cover plate, and performing a curing process on the second adhesive layer;

[0017] Wherein, the curing rate of the first adhesive layer is greater than or equal to the curing rate of the second adhesive layer.

[0018] The present application also proposes a display device comprising a display module, wherein the display module comprises a planar region and a curved region located outside the planar region, wherein the curved region comprises a plurality of side sub-regions located around the planar region and a corner sub-region located between two adjacent side sub-regions.

[0019] Wherein, the display module includes:

[0020] Display panel;

[0021] a cover plate, disposed on one side of the display panel; and

[0022] a first adhesive layer, located between the display panel and the cover plate, the first adhesive layer being provided at least in the corner sub-region, and the first adhesive layer being in contact with the cover plate;

[0023] a second adhesive layer, located between the display panel and the cover plate, the second adhesive layer being provided at least in the corner sub-region, and a surface of the second adhesive layer close to the cover plate being in contact with the first adhesive layer;

[0024] Wherein, the curing rate of the first adhesive layer is greater than or equal to the curing rate of the second adhesive layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a schematic diagram of bubbles generated by the Gaussian surface of a conventional four-curved screen;

[0026] FIG2 is a first structural diagram of the display module of the present application;

[0027] FIG3 is a second structural diagram of the display module of the present application;

[0028] FIG4 is a first cross-sectional view of section MM in FIG3 ;

[0029] FIG5 is a second cross-sectional view of section MM in FIG3 ;

[0030] FIG6 is a diagram of the film layers of the display panel in the display module of the present application;

[0031] FIG7 is an exploded view of the display module of the present application;

[0032] FIG8 is a diagram showing steps of a method for manufacturing a display module according to the present application;

[0033] 9a to 9c are process flow charts of the manufacturing method of the display module of the present application. Modes for Carrying Out the Invention

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0035] In the current four-curved screen, the display panel and the cover plate are bonded together by transparent optical adhesive, which includes OCA adhesive and the like. There are horizontal and vertical curved overlapping areas at the four top corners of the four-curved screen. When the display panel and the cover plate are bonded and enter the curved overlapping area, they will be compressed. The curved overlapping area is called the Gaussian angle area, and the curved surface of the curved overlapping area is called the Gaussian surface. When the display panel completely enters the Gaussian angle area, the Gaussian surface of the Gaussian angle area can be displayed, and a four-curved screen with a high screen-to-body ratio can be achieved. However, as the area of ​​the display panel entering the Gaussian angle area increases, the back panel and the display panel are subjected to greater compression. The greater the compression, the more likely the Gaussian surface of the display panel will be prone to obvious wrinkles when it is bonded to the cover plate, and the metal wiring and inorganic layer inside the display panel will be more prone to failure problems such as breakage.

[0036] Please refer to Figure 1, which is a schematic diagram of bubbles generated on the Gaussian surface of an existing four-curved screen. After the display panel 10 and the cover plate 20 are bonded together, the back plate and the display panel 10 are subjected to a large amount of compression in the Gaussian angle area. The back plate, as a support body of the display panel 10, has a high elastic modulus, which causes the back plate to generate a large rebound force F. When the rebound force F is greater than the adhesion force of the transparent optical glue between the display panel 10 and the cover plate 20, the display panel 10 and the cover plate 20 will separate in the Gaussian angle area, thereby causing rebound bubbles to appear on the Gaussian surface GS.

[0037] In response to the above technical problems, this application proposes the following technical solutions.

[0038] Please refer to Figures 2 and 3. The present application provides a display module 100, which includes a flat area 101 and a curved area 102 located outside the flat area 101, and the curved area 102 includes a plurality of side sub-areas 102a located around the flat area 101 and a corner sub-area 102b located between two adjacent side sub-areas 102a; for example, in the structure of Figure 3, the display module 100 includes 4 side sub-areas 102a and 4 corner sub-areas 102b, and the curved surface within the corner sub-area 102b is the Gaussian surface of the present application.

[0039] Please refer to FIG. 4 and FIG. 5 , FIG. 4 is a first cross-sectional view of section MM in FIG. 3 , and FIG. 5 is a second cross-sectional view of section MM in FIG. 3 .

[0040] In this embodiment, the display module 100 includes a display panel 10, a cover plate 20, and a first adhesive layer 30 and a second adhesive layer 40 located between the display panel 10 and the cover plate 20. The first adhesive layer 30 and the second adhesive layer 40 are arranged between the display panel 10 and the cover plate 20, and the first adhesive layer 30 is arranged close to the cover plate 20, and the second adhesive layer 40 is arranged away from the cover plate 20.

[0041] In this embodiment, the first adhesive layer 30 is at least provided in the corner sub-area 102b, and the first adhesive layer 30 contacts the cover plate 20. The second adhesive layer 40 is at least provided in the corner sub-area 102b, and the surface of the second adhesive layer 40 close to the cover plate 20 contacts the first adhesive layer 30.

[0042] In this embodiment, the curing rate of the first adhesive layer 30 is greater than or equal to the curing rate of the second adhesive layer 40 .

[0043] The present application increases the strength of the first adhesive layer 30 by arranging a first adhesive layer 30 and a second adhesive layer 40 between the display panel 10 and the cover plate 20, and makes the curing rate of the first adhesive layer in contact with the cover plate 20 greater than or equal to the curing rate of the second adhesive layer away from the cover plate 20, so as to increase the resilience of the first adhesive layer 30 against the rebound force exerted by the module structure in the corner sub-area 102b, thereby alleviating the problem of bubbles easily appearing on the Gaussian surface of the existing four-curved screen after bonding.

[0044] It should be noted that the curing rate of the present application is the degree of curing inside the first adhesive layer 30 and the second adhesive layer 40. The greater the curing rate, the greater the cohesive force of the material itself, that is, the increase in the internal strength of the first adhesive layer 30, which increases the ability of the first adhesive layer 30 to resist the rebound force exerted by the module structure in the corner sub-area 102b, thereby avoiding the technical problem of bubbles appearing between the first adhesive layer 30 and the cover plate 20.

[0045] It should be noted that the curing rate of the first adhesive layer 30 and the second adhesive layer 40 of the present application is also positively correlated with the modulus. The higher the curing rate, the greater the modulus. That is, the present application can increase the modulus of the first adhesive layer 30, so that the first adhesive layer 30 can resist the rebound force exerted by the module structure in the corner sub-area 102b, thereby avoiding the technical problem of bubbles appearing between the first adhesive layer 30 and the cover plate 20; the modulus of the present application can be Young's modulus or storage modulus.

[0046] It should be noted that, since the bubbles between the cover plate 20 and the display panel 10 only exist in the corner sub-region 102b, the first adhesive layer 30 and the second adhesive layer 40 of the present application can be set only in the corner sub-region 102b. Alternatively, the first adhesive layer 30 and the second adhesive layer 40 of the present application can be set only in the corner sub-region 102b and the side sub-region 102a; alternatively, the first adhesive layer 30 and the second adhesive layer 40 of the present application can be laid in an entire layer, and only the first adhesive layer 30 and the second adhesive layer 40 of the present application can be set in the flat area 101 and the curved area 102; the following embodiment is described by taking the example that the first adhesive layer 30 and the second adhesive layer 40 can be set in the flat area 101 and the curved area 102.

[0047] It should be noted that the material of the first adhesive layer 30 of the present application includes UV-curing optical adhesive, and the material of the second adhesive layer 40 includes one of UV-curing optical adhesive and non-UV-curing optical adhesive; for example, the materials of the first adhesive layer 30 and the second adhesive layer 40 both include UV-curing optical adhesive, then in the subsequent curing process, ultraviolet light can be used to cure the first adhesive layer 30 and the second adhesive layer 40; or, the material of the first adhesive layer 30 includes UV-curing optical adhesive, and the material of the second adhesive layer 40 includes non-UV-curing optical adhesive, such as thermal curing adhesive.

[0048] The technical solution of this application is now described in conjunction with specific embodiments.

[0049] Please refer to Figure 6, which is a schematic diagram of the display panel 10 of the present application. The display panel 10 may include a base substrate 140, a driving circuit layer 150 disposed on the base substrate 140, a pixel definition layer 160 and a light-emitting device layer 170 disposed on the driving circuit layer 150, an encapsulation layer 180 disposed on the pixel definition layer 160, and a touch layer 190 disposed on the encapsulation layer 180.

[0050] In this embodiment, the base substrate 140 supports various layers provided on the base substrate 140. When the display panel 10 is a bottom-emitting light-emitting display device or a double-sided light-emitting display device, a transparent base substrate is used. When the display panel 10 is a top-emitting light-emitting display device, a semi-transparent or opaque base substrate as well as a transparent base substrate can be used.

[0051] In this embodiment, the base substrate 140 is made of an insulating material such as glass, quartz, or polymer resin. The base substrate 140 can be a rigid substrate or a flexible substrate that can be bent, folded, rolled, etc. Examples of flexible materials for the flexible substrate include polyimide (PI), but are not limited to polyimide (PI).

[0052] In this embodiment, referring to FIG6 , the driving circuit layer 150 may include a plurality of thin film transistors, which may be of an etch barrier type, a back channel etch type, or may be divided into bottom-gate thin film transistors, top-gate thin film transistors, and other structures according to the position of the gate electrode and the active layer, without any specific limitation. For example, the thin film transistor shown in Figure 7 is a top-gate thin film transistor, which may include a shading unit 151 arranged on the substrate, a buffer layer 152 arranged on the shading unit 151, an active layer 153 arranged on the buffer layer 152, a gate insulating layer 154 arranged on the active layer 153, a gate layer 155 arranged on the gate insulating layer 154, an inter-insulating layer 156 arranged on the gate layer 155, a source-drain electrode layer 157 arranged on the inter-insulating layer 156, and a flat layer 158 arranged on the source-drain electrode layer 157; in this embodiment, the inter-insulating layer 156 can be laid out as a whole layer, or as shown in the structure in Figure 6, it can be formed in the same mask process as the gate layer 155. The structure of the thin film transistor in Figure 6 is only an example of the present application, and other types of thin film transistors are also applicable to the present application.

[0053] In this embodiment, referring to FIG6 , the light-emitting device layer 170 may further include an anode layer 171 disposed on the planar layer 158, a light-emitting layer 172 disposed on the anode layer 171, and a cathode layer 173 disposed on the light-emitting layer 172. The anode layer 171 includes a plurality of anodes, the pixel definition layer 160 includes a plurality of pixel openings corresponding one-to-one to the plurality of anodes, and each pixel opening exposes the upper surface of an anode. The light-emitting layer may include a plurality of light-emitting pixels corresponding one-to-one to the plurality of anodes.

[0054] In this embodiment, referring to FIG. 6 , the encapsulation layer 180 is covered on the pixel definition layer 160 and continuously covers a plurality of pixel openings and a plurality of light-emitting pixels; wherein the encapsulation layer 180 may include at least a first inorganic encapsulation layer 181 stacked on the pixel definition layer 160, a first organic encapsulation layer 182, and a second inorganic encapsulation layer 183.

[0055] In this embodiment, referring to FIG6 , the touch layer 190 may include a first touch metal layer and a second touch metal layer disposed on the encapsulation layer 180, and an insulating layer disposed between the first touch metal layer and the second touch metal layer. The touch layer 190 provided in this embodiment of the application may be of a mutual capacitance type or a self-capacitance type. The specific type and structure of the touch layer 190 may be selected based on actual needs.

[0056] In this embodiment, please refer to Figure 7, which is a decomposition diagram of the display module 100 of the present application. The display module 100 also includes a polarizer 50. The polarizer 50 can be arranged between the display panel 10 and the second adhesive layer 40. For example, the polarizer 50 can be arranged above the touch layer 190 in the display panel 10, and there is no specific limitation.

[0057] In this embodiment, referring to FIG. 7 , the display module 100 further includes a backplane layer 60 disposed on a side of the display panel 10 away from the cover plate 20. The backplane layer is disposed on the non-light-emitting side of the display module 100 and is used to support the display panel 10. The material of the backplane layer 60 may include polyethylene terephthalate (PET), for example.

[0058] In this embodiment, referring to Figures 4, 5, and 7, the display module 100 further includes a support function layer 70 disposed on the side of the back plate away from the cover plate 20. The support function layer 70 is used to cooperate with the back plate layer 60 to support the display panel 10 and to dissipate heat from the display panel 10. The support function layer 70 may include multiple stacked sublayers, such as a buffer layer, a heat dissipation layer, and a metal layer. The buffer layer may be made of foam or polyethylene terephthalate with relatively large elastic deformation properties, the heat dissipation layer may be made of a material such as graphite with excellent thermal conductivity or heat dissipation, and the metal layer may be made of copper foil, etc.

[0059] In this embodiment, referring to Figures 4, 5 and 7, the cover plate 20 is a glass cover plate 20, the cover plate 20 has a first surface and a second surface, the first surface is a light emitting surface, the second surface is a backlight surface, and the first adhesive layer 30 is in contact with the second surface of the cover plate 20.

[0060] In this embodiment, referring to Figures 4, 5 and 7, the display module 100 further includes a light-shielding layer 80 disposed at the edge of the cover plate 20. The light-shielding layer 80 is disposed between the cover plate 20 and the first adhesive layer 30. The light-shielding layer 80 is used to shield the edge non-display area to prevent light leakage in the edge area. In addition to being located between the cover plate 20 and the first adhesive layer 30, the light-shielding layer 80 in this embodiment also extends from the edge of the second surface of the cover plate 20 to the side surface between the first surface and the second surface of the cover plate 20. The material of the light-shielding layer 80 can be ink.

[0061] It should be noted that since a light-shielding layer 80 is provided at the edge of the cover plate 20, when the first adhesive layer 30 of the present application is cured by ultraviolet light, the ultraviolet light cannot irradiate the area of ​​the first adhesive layer 30 blocked by the light-shielding layer 80, and the area is not completely cured, that is, the curing rate of the adhesive in the area is low, resulting in poor cohesion of the first adhesive layer 30 in the edge area, and bubbles are easily formed between the cover plate 20 and the display panel 10.

[0062] In the present application, after the first adhesive layer 30 is bonded to the cover plate 20, ultraviolet light is directly irradiated on the surface of the first adhesive layer 30 away from the cover plate 20 to complete the curing process of the first adhesive layer 30, thereby avoiding the technical problem of poor cohesion of the first adhesive layer 30 in the edge area; secondly, the second adhesive layer 40 is bonded to the surface of the display panel 10 facing the cover plate 20, and the surface of the second adhesive layer 40 away from the display panel 10 is bonded to the first adhesive layer 30 to complete the bonding of the display panel 10 and the cover plate 20, and finally the second adhesive layer 40 is subjected to a curing process.

[0063] In this embodiment, when the material of the second adhesive layer 40 is a non-UV light-curing optical adhesive, the second adhesive layer 40 can be cured using a thermal curing process, so that the first adhesive layer 30 and the second adhesive layer 40 are both completely cured. The curing rates of the first adhesive layer 30 and the second adhesive layer 40 are equal, that is, the cohesive forces of the first adhesive layer 30 and the second adhesive layer 40 can be equal.

[0064] Please refer to Figures 4 and 5. When the material of the second adhesive layer 40 is UV-curing optical adhesive, the first adhesive layer 30 includes a first sub-section 310 and a second sub-section 320, and the second adhesive layer 40 includes a third sub-section 410 and a fourth sub-section 420. The orthographic projections of the first sub-section 310 and the third sub-section 410 on the light-shielding layer 80 are located within the light-shielding layer 80, and the orthographic projections of the second sub-section 320 and the fourth sub-section 420 on the plane where the cover plate 20 in the plane area 101 is located do not overlap with the light-shielding layer 80, that is, in the top view direction of the display module, the first sub-section 310 and the third sub-section 410 both overlap with the light-shielding layer 80, and the second sub-section 320 and the fourth sub-section 420 both do not overlap with the light-shielding layer 80.

[0065] In this embodiment, the curing rates of the first sub-section 310 , the second sub-section 320 and the third sub-section 410 are equal, and the curing rate of the fourth sub-section 420 is less than or equal to the curing rate of the third sub-section 410 .

[0066] In this embodiment, due to the provision of the light-shielding layer 80, ultraviolet light cannot irradiate the area of ​​the second adhesive layer 40 that is blocked by the light-shielding layer 80, that is, the fourth sub-section 420, and the area is not completely cured, resulting in a lower curing rate of the fourth sub-section 420; and the first adhesive layer 30 has completed the curing process of the first adhesive layer 30 before being bonded with the second adhesive layer 40, so the curing rates of the first sub-section 310 and the second sub-section 320 in the first adhesive layer 30 are the same, and at the same time, the third sub-section 410 is not blocked by the light-shielding layer 80, so the third sub-section 410 is completely cured, and the curing rate of the third sub-section 410 can be the same as the curing rates of the first sub-section 310 and the second sub-section 320.

[0067] In this embodiment, since bubbles are only easily generated in the corner sub-region 102b of the display module 100, the present application can dispose an optical adhesive with a higher curing rate in the corner sub-region 102b to improve the cohesive force of the adhesive in the corner sub-region. For example, the curing rate of the first adhesive layer 30 in the corner sub-region 102b is greater than the curing rate of the first adhesive layer 30 in the side sub-region 102a, and the curing rate of the first adhesive layer 30 in the corner sub-region 102b is greater than the curing rate of the first adhesive layer 30 in the planar region 101; or the curing rate of the first adhesive layer 30 in the corner sub-region 102b is greater than the curing rate of the first adhesive layer 30 in the side sub-region 102a, and the curing rate of the first adhesive layer 30 in the side sub-region 102a is greater than the curing rate of the first adhesive layer 30 in the planar region 101.

[0068] In this embodiment, since the material of the first adhesive layer 30 is different from the material of the cover plate 20, and the material of the first adhesive layer 30 is similar to the material of the second adhesive layer 40, the surface energy of the interface between the first adhesive layer 30 and the second adhesive layer 40 is greater than the surface energy of the interface between the cover plate 20 and the first adhesive layer 30. Therefore, after the first adhesive layer 30 and the second adhesive layer 40 are cured, the bonding force between the first adhesive layer 30 and the cover plate 20 can be smaller than the bonding force between the second adhesive layer 40 and the first adhesive layer 30.

[0069] In this embodiment, since the first adhesive layer 30 has been solidified when the first adhesive layer 30 and the second adhesive layer 40 are bonded, in order to improve the bonding strength between the display panel 10 and the cover plate 20, the present application can increase the area of ​​the second adhesive layer 40 so that the second adhesive layer 40 completely covers the first adhesive layer 30; for example, in the structure of Figure 4, the boundary of the first adhesive layer 30 is located in the curved area 102, and the boundary of the first adhesive layer 30 is retracted relative to the boundary of the second adhesive layer 40 toward the flat area 101.

[0070] The present application achieves a solution by shrinking the boundary of the first adhesive layer 30 relative to the boundary of the second adhesive layer 40, which is equivalent to increasing the area of ​​the second adhesive layer 40, thereby increasing the bonding area between the first adhesive layer 30 and the second adhesive layer 40, and improving the adhesion between the first adhesive layer 30 and the second adhesive layer 40, thereby avoiding the technical problem of separation between the display panel 10 and the cover plate 20.

[0071] In the display module 100 of the present application, the spacing L1 between the boundary of the second adhesive layer 40 and the boundary of the first adhesive layer 30 is greater than or equal to 0 and less than or equal to 0.5 microns. For example, in the structure of FIG4 , the boundaries of the second adhesive layer 40 and the first adhesive layer 30 on the same side have a spacing L1. Furthermore, because both the first adhesive layer 30 and the second adhesive layer 40 are in a curved state within the corner sub-region 102b, the spacing L1 between the boundary of the second adhesive layer 40 and the boundary of the first adhesive layer 30 in the present application can be an arc length. For example, in the cross-section shown in FIG4 , the arc length L1 between the boundary of the second adhesive layer 40 and the boundary of the first adhesive layer 30 can be greater than or equal to 0 and less than or equal to 0.5 microns.

[0072] Meanwhile, referring to FIG. 5 , the boundary of the first adhesive layer 30 is located in the curved area 102 , and the boundary of the first adhesive layer 30 is convex relative to the boundary of the second adhesive layer 40 in a direction away from the planar area 101 .

[0073] It should be noted that in order to avoid the risk of glue overflow in the first adhesive layer 30, the boundary of the first adhesive layer 30 cannot protrude too much from the boundary of the second adhesive layer 40. For example, the distance L2 between the boundary of the second adhesive layer 40 and the boundary of the first adhesive layer 30 is greater than 0 and less than or equal to 0.1 microns.

[0074] In this embodiment, since the first adhesive layer 30 and the second adhesive layer 40 are bonded, the first adhesive layer 30 will be squeezed and the outer boundary of the first adhesive layer 30 will spread to the surroundings. In order to avoid the occurrence of glue overflow, the boundary of the first adhesive layer 30 is retracted relative to the boundary of the second adhesive layer 40 during the preparation process to reserve a certain amount of glue overflow space; and in the final product, according to the reserved glue overflow space, the boundary of the first adhesive layer 30 can be retracted or convex relative to the boundary of the second adhesive layer 40. For example, in Figure 4, the boundary of the first adhesive layer 30 is retracted relative to the boundary of the second adhesive layer 40 toward the plane area 101. For example, in Figure 5, the boundary of the first adhesive layer 30 is convex relative to the boundary of the second adhesive layer 40 toward the direction away from the plane area 101.

[0075] In this embodiment, the boundary of the first adhesive layer 30 and the boundary of the second adhesive layer 40 may be located in the same plane, that is, the boundary of the first adhesive layer 30 and the boundary of the second adhesive layer 40 may be flush.

[0076] Since the cohesion of a material is related to its thickness in addition to its own properties, the thickness of the material is positively correlated with the cohesion of the material. For example, the thickness of the first adhesive layer 30 is greater than or equal to the thickness of the second adhesive layer 40.

[0077] The present application increases the thickness of the first adhesive layer 30 to increase the cohesive force of the first adhesive layer 30, thereby increasing the strength of the first adhesive layer 30, so that the first adhesive layer 30 can resist the rebound force applied by the module structure in the corner sub-area 102b, thereby alleviating the problem of bubbles easily appearing on the Gaussian surface of the existing four-curved screen after bonding.

[0078] In this embodiment, the thickness of the first adhesive layer 30 is in a range of 25 micrometers to 200 micrometers, and the thickness of the second adhesive layer 40 is in a range of 25 micrometers to 200 micrometers.

[0079] Please refer to Figure 4. Since the second adhesive layer 40 is first formed on the side of the display panel 10 close to the cover plate 20 before curing, and the coating area of ​​the adhesive layer cannot be precisely controlled, the present application applies the second adhesive layer 40 on the surface of the display panel 10 facing the cover plate 20 before cutting the display panel 10 and the back plate, and then cuts the second adhesive layer 40, the display panel 10 and the back plate together. Therefore, the boundaries of the second adhesive layer 40, the display panel 10 and the back plate of the present application can be located in the same plane.

[0080] In this embodiment, referring to FIG. 4 , since the polarizer 50 is typically disposed between the second adhesive layer 40 and the display panel 10 , the boundaries of the polarizer 50 , the second adhesive layer 40 , the display panel 10 , and the backplane of the present application may be located in the same plane.

[0081] Referring to FIG. 8 , the present application further proposes a method for manufacturing a display module 100 . The display module 100 includes a planar region 101 and a curved region 102 located outside the planar region 101 . The curved region 102 includes a plurality of side sub-regions 102 a located around the planar region 101 and a corner sub-region 102 b located between two adjacent side sub-regions 102 a . The method includes:

[0082] S10, providing a cover plate 20;

[0083] 9 a and FIG. 4 , the cover plate 20 is a glass cover plate 20 , and the cover plate 20 has a first surface and a second surface. The first surface is a light emitting surface, and the second surface is a backlight surface.

[0084] In the structure of Figure 9a, a light-shielding layer 80 is further provided at the edge of the cover plate 20, and the light-shielding layer 80 is used to block the non-display area of ​​the edge to prevent light leakage in the edge area; the light-shielding layer 80 also extends from the edge of the second surface of the cover plate 20 to the side between the first surface and the second surface of the cover plate 20; the material of the light-shielding layer 80 can be ink.

[0085] S20, forming a first adhesive layer 30 on a side of the cover plate 20 away from the light-emitting surface of the display module 100, and performing a curing process on the first adhesive layer 30, wherein the first adhesive layer 30 is provided at least in the corner sub-region 102b;

[0086] Please refer to FIG. 9 a . The material of the first adhesive layer 30 of the present application may include a UV-curable optical adhesive. That is, the first adhesive layer 30 may be cured by UV light.

[0087] In this embodiment, due to the presence of the light-shielding layer 80, when ultraviolet light is irradiated from the first surface of the cover plate 20 to the first adhesive layer 30, the ultraviolet light cannot enter the first adhesive layer 30 covered by the light-shielding layer 80, resulting in incomplete curing of the first adhesive layer 30; therefore, the present application can directly irradiate the surface of the first adhesive layer 30 away from the cover plate 20 with ultraviolet light after the first adhesive layer 30 is bonded to the cover plate 20, so as to complete the curing process of the first adhesive layer 30, thereby avoiding the technical problem of a low curing rate of the first adhesive layer 30 in the edge area.

[0088] S30 , providing a display panel 10 , and forming a second adhesive layer 40 on a side of the display panel 10 close to the light emitting surface of the display module 100 , wherein the second adhesive layer 40 is at least disposed in the corner sub-region 102 b ;

[0089] Please refer to FIG. 9 b , the material of the second adhesive layer 40 includes one of a UV-curable optical adhesive and a non-UV-curable optical adhesive.

[0090] In this embodiment, the display module 100 further includes a backplane layer 60 disposed on a side of the display panel 10 away from the cover plate 20 , and a polarizer 50 disposed between the second adhesive layer 40 and the display panel 10 .

[0091] In this embodiment, since the second adhesive layer 40 is first formed on the side of the display panel 10 close to the cover plate 20 before curing, and the coating area of ​​the adhesive layer cannot be precisely controlled, the present application applies the second adhesive layer 40 on the surface of the display panel 10 facing the cover plate 20 before cutting the display panel 10 and the back plate, and then cuts the second adhesive layer 40, the display panel 10 and the back plate together. Therefore, the boundaries of the second adhesive layer 40, the boundaries of the polarizer 50, the boundaries of the display panel 10 and the boundaries of the back plate of the present application can be located in the same plane.

[0092] S40, bringing a surface of the second adhesive layer 40 away from the display panel 10 into contact with a surface of the first adhesive layer 30 away from the cover plate 20, and performing a curing process on the second adhesive layer 40;

[0093] Referring to FIG. 9 c , after the second adhesive layer 40 and the first adhesive layer 30 are bonded, the second adhesive layer 40 may be directly subjected to a curing process to complete the bonding of the display panel 10 and the cover plate 20 .

[0094] In this embodiment, when the material of the second adhesive layer 40 is a non-UV light-curing optical adhesive, the second adhesive layer 40 can be cured using a thermal curing process, so that the first adhesive layer 30 and the second adhesive layer 40 are both completely cured, and the curing rates of the first adhesive layer 30 and the second adhesive layer 40 can be equal.

[0095] In this embodiment, please refer to Figure 4. When the material of the second adhesive layer 40 is UV-curing optical adhesive, the first adhesive layer 30 includes a first sub-section 310 and a second sub-section 320, and the second adhesive layer 40 includes a third sub-section 410 and a fourth sub-section 420. The orthographic projections of the first sub-section 310 and the third sub-section 410 on the light-shielding layer 80 are located within the light-shielding layer 80, and the orthographic projections of the second sub-section 320 and the fourth sub-section 420 on the light-shielding layer 80 do not overlap with the light-shielding layer 80. The curing rates of the first sub-section 310, the second sub-section 320 and the third sub-section 410 are equal, and the curing rate of the fourth sub-section 420 is less than or equal to the curing rate of the third sub-section 410.

[0096] In this embodiment, due to the provision of the light-shielding layer 80, ultraviolet light cannot irradiate the area of ​​the second adhesive layer 40 that is blocked by the light-shielding layer 80, that is, the fourth sub-section 420. This area is not completely cured and has a low curing rate, resulting in poor cohesion of the fourth sub-section 420. The first adhesive layer 30 has completed the curing process of the first adhesive layer 30 before being bonded to the second adhesive layer 40. Therefore, the curing rates of the first sub-section 310 and the second sub-section 320 in the first adhesive layer 30 are the same. At the same time, the third sub-section 410 is not blocked by the light-shielding layer 80, so the third sub-section 410 is completely cured, and the curing rate of the third sub-section 410 can be the same as the curing rates of the first sub-section 310 and the second sub-section 320.

[0097] This application also proposes a display device comprising a terminal body and the aforementioned display module, the terminal body and display module being integrated into one body. The terminal body may comprise a device such as a circuit board bound to a display panel, and a cover plate covering the display panel. The display device may include electronic devices such as mobile phones, televisions, and laptop computers.

[0098] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0099] The above is a detailed introduction to a spliced ​​display module, a preparation method, and a display device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display module, which includes a planar region and a curved surface region located at the periphery of the planar region, and the curved surface region includes a plurality of side sub-regions located on the periphery of the planar region and corner sub-regions located between two adjacent side sub-regions: wherein, The display module includes: A display panel; A cover plate disposed on one side of the display panel; and A first adhesive layer located between the display panel and the cover plate, the first adhesive layer being disposed at least in the corner sub-region, and the first adhesive layer being in contact with the cover plate; A second adhesive layer located between the display panel and the cover plate, the second adhesive layer being disposed at least in the corner sub-region, and the surface of the second adhesive layer close to the cover plate being in contact with the first adhesive layer; Wherein, the curing rate of the first adhesive layer is greater than or equal to the curing rate of the second adhesive layer.

2. The display module according to claim 1, wherein, The adhesive force between the first adhesive layer and the cover plate is less than the adhesive force between the second adhesive layer and the first adhesive layer.

3. The display module according to claim 1, wherein, The boundary of the first adhesive layer is located in the curved surface region, and the boundary of the first adhesive layer is retracted inward in the direction towards the flat surface region relative to the boundary of the second adhesive layer.

4. The display module according to claim 3, wherein, The distance between the boundary of the second adhesive layer and the boundary of the first adhesive layer is greater than or equal to 0 and less than or equal to 0.5 micrometers.

5. The display module according to claim 1, wherein, The boundary of the first adhesive layer is located in the curved surface region, and the boundary of the first adhesive layer protrudes outward in the direction away from the flat surface region relative to the boundary of the second adhesive layer.

6. The display module according to claim 5, wherein, The distance between the boundary of the second adhesive layer and the boundary of the first adhesive layer is greater than 0 and less than or equal to 0.1 micrometers.

7. The display module according to claim 1, wherein, The thickness of the first adhesive layer is greater than or equal to the thickness of the second adhesive layer.

8. The display module according to claim 7, wherein, The thickness range of the first adhesive layer is 25 micrometers to 200 micrometers, and the thickness range of the second adhesive layer is 25 micrometers to 200 micrometers.

9. The display module according to claim 1, wherein, The display module further includes a light-shielding layer located at the edge of the cover plate, and the light-shielding layer is disposed between the cover plate and the first adhesive layer; Wherein, at least a part of the first adhesive layer and the light-shielding layer are overlapped.

10. The display module according to claim 9, wherein, The first adhesive layer includes a first sub-part and a second sub-part, the second adhesive layer includes a third sub-part and a fourth sub-part, the orthographic projections of the first sub-part and the third sub-part on the light-shielding layer are located within the light-shielding layer, the orthographic projections of the second sub-part and the fourth sub-part on the plane where the cover plate is located do not overlap with the light-shielding layer, and the curing rates of the first sub-part, the second sub-part and the third sub-part are equal.

11. The display module according to claim 10, wherein, The material of the first adhesive layer is the same as the material of the first adhesive layer; Wherein, the curing rate of the fourth sub-part is less than the curing rate of the third sub-part.

12. The display module according to claim 11, wherein, The material of the first adhesive layer includes an ultraviolet-curable optical adhesive, and the material of the second adhesive layer includes an ultraviolet-curable optical adhesive.

13. The display module according to claim 10, wherein, The material of the first adhesive layer is different from the material of the first adhesive layer; Wherein, the curing rate of the fourth sub-part is equal to the curing rate of the third sub-part.

14. The display module according to claim 13, wherein, The material of the first adhesive layer includes an ultraviolet-curable optical adhesive, and the material of the second adhesive layer includes a non-ultraviolet-curable optical adhesive.

15. The display module according to claim 1, wherein, The display module further includes a back plate disposed on the side of the display panel away from the cover plate, and the boundaries of the second adhesive layer, the display panel and the back plate are located in the same plane.

16. The display module according to claim 15, wherein, The display module further includes a polarizer disposed between the display panel and the second adhesive layer, and the boundaries of the second adhesive layer, the polarizer, the display panel, and the backplane are located in the same plane.

17. A method for manufacturing a display module, which includes a planar region and a curved region located outside the planar region, and the curved region includes a plurality of side sub-regions located on the periphery of the planar region and a corner sub-region located between two adjacent side sub-regions. The method for manufacturing the display module includes: Providing a cover plate; Forming a first adhesive layer on a side of the cover plate away from the light-emitting surface of the display module, and performing a curing process on the first adhesive layer, where the first adhesive layer is disposed at least within the corner sub-region; Providing a display panel, and forming a second adhesive layer on a side of the display panel close to the light-emitting surface of the display module, where the second adhesive layer is disposed at least within the corner sub-region; Bringing a surface of the second adhesive layer away from the display panel into contact with a surface of the first adhesive layer away from the cover plate, and performing a curing process on the second adhesive layer; Wherein, the curing rate of the first adhesive layer is greater than or equal to the curing rate of the second adhesive layer.

18. A display device, which includes a display module. The display module includes a planar region and a curved region located outside the planar region, and the curved region includes a plurality of side sub-regions located on the periphery of the planar region and a corner sub-region located between two adjacent side sub-regions: Among them, The display module includes: A display panel; A cover plate disposed on one side of the display panel; and A first adhesive layer located between the display panel and the cover plate, where the first adhesive layer is disposed at least within the corner sub-region, and the first adhesive layer is in contact with the cover plate; A second adhesive layer located between the display panel and the cover plate, where the second adhesive layer is disposed at least within the corner sub-region, and a surface of the second adhesive layer close to the cover plate is in contact with the first adhesive layer; Wherein, the curing rate of the first adhesive layer is greater than or equal to the curing rate of the second adhesive layer.

19. The display device according to claim 18, wherein, The boundary of the first adhesive layer is located within the curved region, and the boundary of the first adhesive layer is retracted inward in a direction towards the planar region relative to the boundary of the second adhesive layer.

20. The display device according to claim 19, wherein The display module further includes a light-shielding layer located at the edge of the cover plate, where the light-shielding layer is disposed between the cover plate and the first adhesive layer, and at least a part of the first adhesive layer and the light-shielding layer are overlapped; Wherein, the first adhesive layer includes a first sub-part and a second sub-part, the second adhesive layer includes a third sub-part and a fourth sub-part, the orthographic projections of the first sub-part and the third sub-part on the light-shielding layer are located within the light-shielding layer, the orthographic projections of the second sub-part and the fourth sub-part on the plane where the cover plate is located do not overlap with the light-shielding layer, the curing rates of the first sub-part, the second sub-part, and the third sub-part are equal, and the curing rate of the fourth sub-part is less than the curing rate of the third sub-part.

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