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

Abstract

The invention discloses a cover plate assembly, a manufacturing method of the cover plate assembly, a display module and a display device.The cover plate assembly comprises a center area and an edge area, the cover plate assembly further comprises a first sub-assembly, the first sub-assembly comprises a protective film layer, a first fixing part and a cover plate body which are sequentially arranged in the thickness direction, and the first fixing part and the cover plate body are located in the center area; the cover plate body is connected with the protective film layer through the first fixing part; the second sub-assembly comprises a release film layer and a second fixing part which are sequentially arranged in the thickness direction, the second fixing part is located in the edge area, the viscosity of the second fixing part is variable, and the second fixing part is arranged around the cover plate body. According to the cover plate assembly provided by the embodiment of the first aspect, the viscosity of the second fixing part is variable, and attachment and separation of the first sub-assembly and the second sub-assembly are achieved by controlling the viscosity change of the second fixing part; the first fixing parts are only distributed in the central area, so that the risk of local adhesive pulling during adhesion and separation of the edge area and the release film layer is avoided.

Description

Technical Field

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

[0002] The existing cover assembly uses a composite structure of a softer polyethylene terephthalate (PET) film layer and a harder ultra-thin glass material (UTG), and uses PET + optically clear adhesive (OCA) + UTG as an integrated material to form a protective window adhesive structure (Protective Window OCA, PWO). When the cover assembly needs to be installed, the release film on the UTG side of the PWO is torn off, and the remaining PET + OCA + UTG structure is bonded to the display panel to obtain a complete display module. However, when the existing PWO structure is torn off the release film, it is easy to have local glue pulling problems at the edge. Summary of the invention

[0003] The embodiments of the present application provide a cover plate assembly, a method for manufacturing the cover plate assembly, a display module and a display device. The cover plate assembly provided in the first aspect of the embodiment of the present application can improve the problem of local glue pulling that occurs when the release film layer is torn off.

[0004] In a first aspect, an embodiment of the present application provides a cover assembly, the cover assembly comprising a central area and an edge area surrounding the central area, the cover assembly further comprising: a first subassembly comprising a protective film layer, a first fixing portion and a cover body sequentially arranged along a thickness direction, the first fixing portion and the cover body at least partially overlapping with the central area, the cover body being connected to the protective film layer via the first fixing portion; a second subassembly comprising a release film layer and a second fixing portion sequentially arranged along a thickness direction, the second fixing portion at least partially overlapping with the edge area, the viscosity of the second fixing portion being variable, and the second fixing portion being arranged around the cover body.

[0005] Compared with the prior art, the cover plate assembly provided in the first aspect of the present application has at least the following beneficial effects:

[0006] The viscosity of the second fixing part arranged around the cover plate body in the edge area is variable. When the viscosity of the second fixing part is relatively large, the first subassembly and the second subassembly are fitted and fixed; when the viscosity of the second fixing part is relatively small, the first subassembly and the second subassembly can be separated. The fitting and separation of the first subassembly and the second subassembly can be controlled by controlling the viscosity change of the second fixing part.

[0007] The first fixing portion in the central area is used to connect the protective film layer and the cover body, and is only distributed in the central area to avoid adhesion to the release film layer in the edge area and the risk of local glue pulling when the first subassembly is separated from the second subassembly.

[0008] In a second aspect, an embodiment of the present application provides a method for manufacturing a cover plate assembly, characterized by comprising:

[0009] A first adhesive is attached to one side of the protective film layer along the thickness direction, the protective film layer includes a central area and an edge area surrounding the central area, and a portion of the first adhesive located in the edge area is removed to obtain a protective film layer subassembly;

[0010] A cover plate body is arranged on one side of the release film body along the thickness direction, and the cover plate body is located in the corresponding central area;

[0011] A second adhesive is attached to the side of the cover body away from the release film body, wherein the viscosity of the second adhesive is variable, and a portion of the second adhesive located in the corresponding central area is removed so that the surface of the cover body is exposed between the second adhesives to obtain a release film layer subassembly;

[0012] The protective film layer subassembly is bonded to the release film layer subassembly to obtain a cover plate assembly, wherein the side of the protective film layer subassembly bonded with the first adhesive is opposite to the side of the release film layer subassembly bonded with the second adhesive, the first adhesive is bonded to the cover plate body to form a first fixing portion, and the second adhesive forms a second fixing portion.

[0013] In a third aspect, an embodiment of the present application provides a display module, comprising a central area and an edge area surrounding the central area, the display module also comprising: a first subassembly, comprising a protective film layer, a first fixing portion and a cover body arranged in sequence along the thickness direction, the first fixing portion and the cover body are located in the central area, and the cover body is connected to the protective film layer through the first fixing portion; a display panel, attached to the side of the cover body away from the protective film layer.

[0014] In a fourth aspect, an embodiment of the present application provides a display device, comprising a display module provided by any embodiment of the third aspect of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0016] Figure 1 It is a schematic diagram of the overall structure of a cover plate assembly and the cross-sectional structure along the AA direction provided by the relevant technology;

[0017] Figure 2 A schematic diagram of the overall structure of the cover plate assembly provided in the first aspect of the present application;

[0018] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along the BB direction;

[0019] Figure 4 for Figure 2 Another schematic diagram of the cross-sectional structure along the BB direction;

[0020] Figure 5 for Figure 2 Another schematic diagram of the cross-sectional structure along the BB direction;

[0021] Figure 6 for Figure 2 Another schematic diagram of the cross-sectional structure along the BB direction;

[0022] Figure 7 A schematic diagram of a process flow of a method for manufacturing a cover plate assembly provided in an embodiment of the second aspect of the present application;

[0023] Figures 8a to 8f A schematic diagram of the process steps of a method for manufacturing a cover plate assembly provided in an embodiment of the second aspect of the present application;

[0024] Fig. 9 A schematic diagram of a process flow of another method for manufacturing a cover plate assembly provided in an embodiment of the second aspect of the present application;

[0025] Figure 10a to Figure 10b A schematic diagram of the process steps of another method for manufacturing a cover plate assembly provided in an embodiment of the second aspect of the present application;

[0026] Fig.11 A schematic diagram of a cross-sectional structure of a display module provided in an embodiment of the third aspect of the present application;

[0027] Fig.12 A schematic diagram of the overall structure of a display device provided in accordance with the fourth aspect of the present application;

[0028] Reference numerals:

[0029] 100-cover plate assembly; AA-center area; NA-edge area;

[0030] 10-first subassembly; 11-first fixing portion; 12-protective film layer; 13-cover plate body;

[0031] 10'-protective film layer subassembly; 20'-release film layer subassembly; 11'-first adhesive glue; 12'-second adhesive glue; 212'-cushion layer;

[0032] 20-second subassembly; 21-release film layer; 211-release film body; 212-gasket portion; 22-second fixing portion;

[0033] 30-display panel;

[0034] 200-display module;

[0035] 300-display device;

[0036] Z-thickness direction.

[0037] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0038] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least part of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0039] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the cover assembly, display module and display device of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0040] Figure 1 The overall structure of a cover plate assembly provided by the related art and the cross-sectional structure along the AA direction are shown.

[0041] See also Figure 1 In the related art, the cover assembly (Cover) on the flexible display panel of the folding screen device usually adopts a composite structure formed by stacking a PET film layer and a UTG layer for the purpose of protecting the display panel and durability requirements. Among them, since the UTG is relatively thin, the side of the UTG is prone to edge collapse and cracking. Therefore, the size of the PET film layer is larger than that of the UTG film layer. The PET film layer needs to completely cover the UTG, and the UTG is retracted inwardly into the PET film layer.

[0042] At the same time, OCA glue is used to fix the PET film layer and the UTG material, and the material is supplied as a PWO structure. The OCA glue itself at least completely covers the surface of the UTG material, and the OCA glue may be exposed between the PET film layer and the UTG material.

[0043] When the PWO structure is supplied as an integrated material, a single PWO structure is provided with a release film (Releasing Layer, RL) attached to one side of the UTG. A barrier film (Barrier Film, BF) and a polyethylene film (Polyethylene, PE) or a silicone oil layer (Silicone Oil, SO) are also provided between the release film RL and the PWO structure. The PE film or silicone oil layer SO is used to achieve the glue-repelling function, so that the release film RL, the barrier film BF and the PE film or silicone oil layer SO can be torn off together when the PWO structure is installed on one side of the display panel. However, it is currently found that when the release film RL, the barrier film BF and the PE film or silicone oil layer SO are torn off together, a local glue pulling problem occurs at the edge of the PWO structure.

[0044] Specifically, there is a problem of glue pulling between the barrier film BF and the OCA glue at the edge between the PET film layer and the UTG material, with an area accounting for about 5%.

[0045] After careful research, the inventors found that in the preparation process of the cover plate assembly, there are the following process steps: a barrier film BF and a PE film or a silicone oil layer SO are first attached to one side of the release film RL, and then a space for accommodating the UTG material is cut on the barrier film and the PE film or the silicone oil layer SO. Since the lower knife angle of the die cutting cannot be completely perpendicular to the barrier film BF, the PE film or the silicone oil layer SO on the barrier film BF is squeezed to both sides of the knife seam, resulting in the barrier film BF being directly exposed under the PE film or the silicone oil layer SO at the edge of the knife seam.

[0046] Then, the UTG material needs to be placed in the space reserved by cutting in the middle of the barrier film, and the surface of the UTG material in the middle of the barrier film is treated with a plasma cleaning process. Plasma cleaning mainly cleans the UTG surface, making it easier to bond the UTG surface to the OCA glue on the PET side in the subsequent process.

[0047] During plasma cleaning, the exposed part of the barrier film BF by the PE film or the silicone oil layer SO will also be directly treated by plasma, causing the barrier film BF to fail and forming an incomplete morphology with multiple pits. When the OCA glue on one side of the PET film is attached to the UTG, the OCA glue will also directly contact the exposed part of the barrier film BF and be difficult to tear off, causing the barrier film BF and OCA glue to partially pull when the release film RL is torn off.

[0048] Figure 2 The overall structure of the cover plate assembly 100 provided in the first embodiment of the present application is shown. Figure 3 Shows Figure 2 Cross-sectional structure along BB direction.

[0049] See also Figure 2 and Figure 3 In a first aspect, an embodiment of the present application provides a cover assembly 100 , including a central area AA and an edge area NA surrounding the central area AA. The cover assembly 100 also includes a first subassembly 10 and a second subassembly 20 .

[0050] The first subassembly 10 includes a protective film layer 12 , a first fixing portion 11 and a cover body 13 arranged in sequence along the thickness direction. The first fixing portion 11 and the cover body 13 at least partially overlap the central area AA. The cover body 13 is connected to the protective film layer 12 through the first fixing portion 11 .

[0051] The second subassembly 20 includes a release film layer 21 and a second fixing portion 22 sequentially arranged along the thickness direction. The second fixing portion 22 at least partially overlaps with the edge area NA, and the viscosity of the second fixing portion 22 is variable. The second fixing portion 22 is arranged around the cover body 13.

[0052] The cover plate assembly 100 provided in the first aspect of the present application has at least the following beneficial effects compared with the prior art:

[0053] The second fixing portion 22 disposed around the cover plate body 13 in the edge area NA has a variable viscosity. When the viscosity of the second fixing portion 22 is relatively high, the first subassembly 10 and the second subassembly 20 are fitted and fixed; when the viscosity of the second fixing portion 22 is relatively low, the first subassembly 10 and the second subassembly 20 can be separated. The fitting and separation of the first subassembly 10 and the second subassembly 20 can be controlled by controlling the viscosity change of the second fixing portion 22.

[0054] The first fixing portion 11 in the central area AA is used to connect the protective film layer 12 and the cover body 13, and does not extend to the edge area NA, so as to avoid adhesion to the release film layer 21 in the edge area NA and the risk of local glue pulling when the first subassembly 10 and the second subassembly 20 are separated.

[0055] The cover assembly 100 is divided into a central area AA and an edge area NA in consideration of the cover body 13 needing to be retracted into the protective film layer 12 .

[0056] Exemplarily, the central area AA in the cover assembly 100 coincides with the size of the display area of ​​the display panel 30 , and the edge area NA coincides with the size of the non-display area of ​​the display panel 30 .

[0057] Exemplarily, the cover assembly 100 is rectangular, the central area AA is a rectangular area in which the shape of the cover assembly 100 is scaled according to a certain ratio, and the edge area NA is a rectangular frame surrounding the central area AA.

[0058] Optionally, the cover assembly 100 includes but is not limited to a circle, an ellipse or an irregular trapezoid, the central area AA is a circle, an ellipse or an irregular trapezoid obtained by scaling the shape of the cover assembly 100 according to a certain proportion, and the edge area NA is a frame surrounding the central area AA.

[0059] The protective film layer 12, the first fixing part 11 and the cover body 13 in the first subassembly 10, and the release film layer 21 and the second fixing part 22 in the second subassembly 20 are arranged in sequence along the thickness direction Z. The arrangement in sequence along the thickness direction Z mentioned here refers to: the protective film layer 12, the first fixing part 11 and the cover body 13, or the release film layer 21 and the second fixing part 22 are arranged in a stacked manner along the thickness direction Z.

[0060] After the protective film layer 12, the first fixing portion 11 and the cover body 13 in the first subassembly 10 and the release film layer 21 and the second fixing portion 22 in the second subassembly 20 are arranged in sequence along the thickness direction Z, the first subassembly 10 and the second subassembly 20 are combined so that the second fixing portion 22, the cover body 13 and the first fixing portion 11 are arranged in the same layer in a horizontal plane perpendicular to the thickness direction Z, thereby realizing that the second fixing portion 22 is arranged around the cover body 13.

[0061] For example, the thickness direction Z of the entire cover assembly 100 is generally consistent with the thickness direction Z of the first subassembly 10 and the second subassembly 20 themselves. Therefore, for the convenience of expression, the thickness direction Z of the cover assembly 100 or the thickness direction Z of the first subassembly 10 and the second subassembly 20 mentioned later in the embodiments of the present application are all shown in the same direction.

[0062] The first fixing portion 11 and the cover plate body 13 in the first subassembly 10 at least partially overlap with the central area AA, and the second fixing portion 22 in the second subassembly 20 at least partially overlaps with the edge area NA. The at least partial overlap mentioned here should be understood as that the first fixing portion 11 is located in the central area AA, and the orthographic projection of the first fixing portion 11 on the side of the protective film layer 12 at least covers part of the central area AA; and the second fixing portion 22 is located in the edge area NA, and the orthographic projection of the second fixing portion 22 on the side of the release film layer 21 at least covers part of the edge area NA.

[0063] The variable viscosity of the second fixing portion 22 means that the first subassembly 10 and the second subassembly 20 can be attached and separated by controlling the viscosity of the second fixing portion 22. When the viscosity of the second fixing portion 22 in the second subassembly 20 is relatively low, the first subassembly 10 including a complete PWO structure can be directly torn off from the release film layer 21 of the second subassembly 20, and when the viscosity of the second fixing portion 22 of the second subassembly 20 is relatively high, the first subassembly 10 can be fixed to the release film layer 21 of the second subassembly 20.

[0064] Since the viscosity of the second fixing part 22 is variable, the second fixing part 22 can be directly taken away when the release film layer 21 is torn off, and the contact between the second fixing part 22 and the first subassembly 10 is easily separated, avoiding the problem of glue pulling. Alternatively, the release film layer 21 is torn off first, and then the second fixing part 22 is cleaned and removed. Since the viscosity of the second fixing part 22 is relatively low, it is relatively easy to clean it and it is not easy to leave glue marks.

[0065] Secondly, the size of the first fixing portion 11 is reduced, and the first fixing portion 11 is only provided in the central area AA, so as to realize the connection between the cover body 13 and the protective film layer 12 while avoiding the risk of the first fixing portion 11 extending to the edge area NA and interfering with the second subassembly 20, and further avoiding the problem of glue pulling.

[0066] Figure 4 Shows Figure 2 Another cross-sectional structure along the BB direction.

[0067] See also Figure 4 In some embodiments, the release film layer 21 also includes a release film body 211 and a gasket portion 212. The gasket portion 212 at least partially overlaps with the edge area NA and is arranged between the release film body 211 and the second fixing portion 22. The gasket portion 212 is arranged around the cover plate body 13. The gasket portion 212 is connected to the protective film layer 12 through the second fixing portion 22, and the first subassembly 10 is bonded to the second subassembly 20.

[0068] In these embodiments, in addition to the release film body 211, the release film layer 21 also includes a gasket portion 212 arranged between the second fixing portion 22 and the release film body 211 along the edge area NA, providing a more suitable contact carrier for the connection between the second fixing portion 22 and the release film layer 21 and the protective film layer 12, so that the connection effect is better. At the same time, the gasket portion 212 has a certain size in the thickness direction Z, so that the amount and size of the second fixing portion 22 can be further limited, thereby saving costs.

[0069] The gasket portion 212 also at least partially overlaps with the edge area NA. At the same time, the gasket portion 212 is arranged between the release film body 211 and the second fixing portion 22, so that the gasket portion 212 and the cover body 13, or the cover body 13 and the first fixing portion 11 are arranged in the same layer in a horizontal plane perpendicular to the thickness direction Z, thereby realizing the gasket portion 212 being arranged around the cover body 13.

[0070] Exemplarily, the maximum dimension of the gasket portion 212 along the thickness direction Z is consistent with the dimension of the cover body 13 along the thickness direction, and the dimensions of the first fixing portion 11 and the second fixing portion 22 along the thickness direction Z are consistent, so that the gasket portion 212 and the cover body 13, the first fixing portion 11 and the second fixing portion 22 are arranged in the same layer in a horizontal plane perpendicular to the thickness direction Z, so that the cover body 13 is embedded between the gasket portion 212, and the first fixing portion 11 is embedded in the second fixing portion 22, further avoiding direct contact between the first fixing portion 11 and the cover body 13.

[0071] Please continue reading Figure 4 In some embodiments, the viscosity of the second fixing portion 22 decreases under ultraviolet light or mercury lamp irradiation, the gasket portion 212 is separated from the protective film layer 12 , and the first subassembly 10 is separated from the second subassembly 20 .

[0072] In these embodiments, the viscosity of the second fixing portion 22 can be reduced under ultraviolet irradiation or mercury lamp irradiation, thereby achieving separation of the first subassembly 10 and the second subassembly 20 and avoiding the problem of glue pulling.

[0073] Exemplarily, the ultraviolet rays or the light emitted by the mercury lamp can irradiate and enter the second fixing part 22 at least from the side of the second fixing part 22 in the plane direction perpendicular to the thickness direction Z, and act inside the second fixing part 22 to reduce the viscosity of the second fixing part 22.

[0074] After the viscosity of the second fixing part 22 decreases, the gasket part 212 can be separated from the protective film layer 12, and the first fixing part 11 is isolated from the gasket part 212. The viscosity of the second fixing part 22 is relatively small, and the problem of glue pulling can be avoided.

[0075] Figure 5 Shows Figure 2 Another cross-sectional structure along the BB direction.

[0076] See also Figure 5 In some embodiments, the orthographic projection area of ​​the second fixing portion 22 on the release film layer 21 is larger than the orthographic projection area of ​​the gasket portion 212 on the release film layer 21 .

[0077] In these embodiments, the second fixing portion 22 extends to the side of the gasket portion 212 along the planar direction perpendicular to the thickness direction Z, so that the contact area between the second fixing portion 22 and the gasket portion 212 is further increased. When the viscosity of the second fixing portion 22 decreases, the second fixing portion 22 overflows and flows along the surface of the gasket portion 212 from the top of the gasket portion 212 to the side faster, so that the gasket portion 212 can be exposed from the second fixing portion 22 faster, further realizing the improvement of production efficiency.

[0078] The orthographic projection area of ​​the second fixing portion 22 on the release film layer 21 is larger than the orthographic projection area of ​​the gasket portion 212 on the release film layer 21. It should be understood that the second fixing portion 22 is partially disposed beyond the gasket portion 212, and the contact area between the second fixing portion 22 and the gasket portion 212 is larger than the plane area of ​​the edge area NA.

[0079] The contact area between the second fixing portion 22 and the gasket portion 212 is further increased, which can further increase the surface tension between the second fixing portion 22 and the gasket portion 212 . When the viscosity of the second fixing portion 22 decreases, the flow speed of the second fixing portion 22 is faster.

[0080] Exemplarily, the second fixing portion 22 extends to the side of the gasket portion 212 away from the cover body 13. When the viscosity of the second fixing portion 22 decreases, the second fixing portion 22 located on the side of the gasket portion 212 drives the second fixing portion 22 located on the top of the gasket portion 212 to flow. The second fixing portion 22 located on the side of the gasket portion 212 is further accelerated due to gravity, so that the gasket portion 212 can be exposed from the second fixing portion 22 faster, thereby further improving the separation efficiency of the first subassembly 10 and the second subassembly 20, and further improving production efficiency.

[0081] Figure 6 Shows Figure 2 Another cross-sectional structure along the BB direction.

[0082] See also Figure 6 In some embodiments, the dimension of the gasket portion 212 along the thickness direction is greater than or equal to the dimension of the cover body 13 along the thickness direction.

[0083] In these embodiments, the dimension of the gasket portion 212 along the thickness direction is greater than or equal to the dimension of the cover plate body 13 along the thickness direction. When the adhesive first covers the entire surface of the release film body 211 and the gasket portion 212, the adhesive with lower viscosity can first flow in the direction toward the center area AA, and gradually fill from the center area AA to the surrounding edge area NA until it overflows from the side of the gasket portion 212 away from the center area AA, thereby achieving complete coverage of the release film layer 21, avoiding the occurrence of voids caused by incomplete filling of the adhesive, and resulting in structural defects in the second fixing portion 22 finally formed.

[0084] When the dimension of the gasket portion 212 along the thickness direction is greater than or equal to the dimension of the cover body 13 along the thickness direction, the beneficial effects of the process steps for preparing the second fixing portion 22 will be further described in detail in the preparation method of the cover assembly 100 provided in other embodiments.

[0085] In some embodiments, the second fixing portion 22 is an ultraviolet curing type viscosity reducing adhesive or a mercury lamp curing type viscosity reducing adhesive, and the gasket portion 212 and the release film body 211 are made of transparent materials.

[0086] In these embodiments, the ultraviolet rays or the light emitted by the mercury lamp can also enter the second fixing portion 22 from one side of the gasket portion 212 to achieve viscosity control of the second fixing portion 22 and improve work efficiency.

[0087] The release film body 211 and the gasket portion 212 are made of transparent materials, which can further help the second fixing portion 22 absorb ultraviolet rays or light emitted by the mercury lamp not only on the side but also on one side of the release film layer 21 to control the viscosity of the second fixing portion 22.

[0088] When the operator performs the viscosity reduction operation, he only needs to irradiate the edge area NA of the cover plate assembly 100 on one side of the release film layer 21 with an ultraviolet lamp or a mercury lamp for a certain period of time.

[0089] In some embodiments, the first fixing portion 11 is optically transparent adhesive.

[0090] In these embodiments, the first fixing portion 11 is an OCA. The first fixing portion 11 realizes the connection between the cover plate body 13 and the protective film layer 12 and does not block the light when installed on the light emitting side of the display panel 30 .

[0091] In some embodiments, the material of the protective film layer 12 is polyethylene terephthalate.

[0092] In some embodiments, the release film layer 21 is made of polyethylene terephthalate or polyethylene.

[0093] Exemplarily, the material of the release film layer 21 is PE or PET, and the size of the release film layer 21 along the thickness direction Z is between 80 micrometers and 90 micrometers.

[0094] In some embodiments, the cover body 13 is made of ultra-thin glass.

[0095] Exemplarily, the cover body 13 is UTG, and the dimensions of the cover body 13 and the gasket portion 212 disposed around the cover body 13 along the thickness direction Z are between 28 microns and 32 microns.

[0096] Figure 7 The process flow of the method for manufacturing the cover plate assembly 100 provided in the second aspect of the present application is shown. Figures 8a to 8f The process steps of the method for manufacturing the cover plate assembly 100 provided in the second embodiment of the present application are shown.

[0097] See also Figure 7 and Figures 8a to 8f In a second aspect, an embodiment of the present application provides a method for manufacturing a cover plate assembly 100, comprising:

[0098] Step S10, attaching a first adhesive 11' to one side of the protective film layer 12 along the thickness direction;

[0099] Step S20, the protective film layer 12 includes a central area AA and an edge area NA surrounding the central area AA, and a portion of the first adhesive 11' located in the edge area NA is removed to obtain a protective film layer subassembly 10';

[0100] Step S30, disposing a cover plate body 13 on one side of the release film body 211 along the thickness direction, wherein the cover plate body 13 is located in the corresponding central area AA;

[0101] Step S40, attaching a second adhesive 12' to the side of the cover body 13 away from the release film body 211, wherein the viscosity of the second adhesive 12' is variable;

[0102] Step S50, removing a portion of the second adhesive 12' located in the corresponding central area AA, so that the surface of the cover body 13 is exposed between the second adhesive 12', and obtaining a release film layer subassembly 20';

[0103] Step S60, the protective film layer subassembly 10' and the release film layer subassembly 20' are bonded to obtain the cover assembly 100, the side of the protective film layer subassembly 10' attached with the first adhesive 11' is opposite to the side of the release film layer subassembly 20' attached with the second adhesive 12', the first adhesive 11' is bonded to the cover body 13 and forms the first fixing part 11, and the second adhesive 12' forms the second fixing part 22.

[0104] The method for manufacturing the cover plate assembly 100 provided in the second aspect embodiment of the present application is used to form the cover plate assembly 100 provided in the first aspect embodiment of the present application. Therefore, the method for manufacturing the cover plate assembly 100 provided in the second aspect embodiment of the present application has the beneficial effects possessed by the cover plate assembly 100 provided in any first aspect embodiment of the present application, and will not be repeated here.

[0105] Compared with the prior art, the manufacturing method of the cover assembly 100 provided in the second aspect embodiment of the present application has at least the following beneficial effects: the second adhesive 12' is used to connect the release film body 211 in the release film layer subassembly 20' with the protective film layer 12 in the protective film layer subassembly 10' to form a second fixing portion 22, and the first adhesive 11' is only distributed in the central area AA to connect the protective film layer 12 with the cover body 13 to form a first fixing portion 11, thereby avoiding the first fixing portion 11 directly contacting other components in the release film layer subassembly 20' except the cover body 13 to cause glue pulling problems.

[0106] When it is needed, only the second fixing part 22 needs to be subjected to a debonding operation, and the release film body 211 and the second fixing part 22 in the release film layer subassembly 20' will be separated from the PWO structure composed of the protective film layer 12, the first fixing part 11 and the cover plate body 13, and the PWO structure can be further attached to the light-emitting side of the display panel 30 to obtain the display module 200.

[0107] Fig. 9 The process flow of another method for manufacturing a cover plate assembly 100 provided in the second aspect of the present application is shown. Figures 10a to 10b The process steps of another method for manufacturing a cover plate assembly 100 provided in an embodiment of the second aspect of the present application are shown.

[0108] See also Fig. 9 and Figures 10a to 10b In some embodiments, before step S30, the method further includes:

[0109] Step S70, a cushion layer 212' is disposed on one side of the release film body 211 along the thickness direction;

[0110] Step S71 , cutting and removing a portion of the pad layer 212 ′ corresponding to the central area AA to obtain a pad portion 212 disposed around the central area AA.

[0111] In these embodiments, the provision of the gasket portion 212 can further reduce the distance between the release film body 211 and the protective film layer 12 along the thickness direction Z, further reduce the amount of the second adhesive 12 ′, and reduce the cost.

[0112] Optionally, the dimensions of the cushion layer 212' and the gasket portion 212 along the thickness direction Z are greater than or equal to the dimensions of the cover body 13 along the thickness direction Z. When the second adhesive 12' is attached to the surface of the gasket portion 212 and the cover body 13, the second adhesive 12' can flow from the edge area NA toward the center area AA, and completely cover the surface of the gasket portion 212 and the cover body 13 from the center area AA to the edge area NA in sequence, thereby preventing the second adhesive 12' from forming holes on the surface due to insufficient filling in the process of forming the second fixing portion 22, thereby causing structural defects when forming the second fixing portion 22.

[0113] In some embodiments, step S50 also includes that the process of removing the second adhesive 12 ′ is a plasma cleaning process.

[0114] In these embodiments, plasma bombardment is used to remove the second adhesive 12 ′ covering the central area AA on the surface of the cover body 13 , and to clean the surface of the cover body 13 to facilitate subsequent bonding with the first adhesive 11 ′.

[0115] Fig.11 The cross-sectional structure of the display module 200 provided in the third embodiment of the present application is shown.

[0116] See also Fig.11 In a third aspect, an embodiment of the present application provides a display module 200 , including a central area AA and an edge area NA surrounding the central area AA. The display module 200 also includes a first subassembly 10 and a display panel 30 .

[0117] The first subassembly 10 includes a protective film layer 12 , a first fixing portion 11 and a cover body 13 arranged in sequence along the thickness direction. The first fixing portion 11 and the cover body 13 are located in the central area AA. The cover body 13 is connected to the protective film layer 12 through the first fixing portion 11 .

[0118] The display panel 30 is attached to a side of the cover body 13 away from the protection film layer 12 .

[0119] In the display module 200 provided in the third aspect of the present application, since the first fixing portion 11 is only distributed in the central area AA, the first fixing portion 11 is avoided from extending to the edge area NA, which may cause glue pulling when the release film is torn off and attached to one side of the display panel 30.

[0120] Fig.12 The overall structure of the display device 300 provided in the fourth embodiment of the present application is shown.

[0121] See also Fig.12In a fourth aspect, an embodiment of the present application provides a display device 300, comprising a display module 200 provided in any embodiment of the third aspect of the present application.

[0122] The display device 300 provided in the fourth embodiment of the present application includes the display module 200 provided in the third embodiment of the present application, and therefore has the beneficial effects possessed by the display module 200 provided in any third embodiment of the present application.

[0123] The display device 300 in the second embodiment of the present application includes but is not limited to mobile phones, personal digital assistants (PDAs), tablet computers, e-books, televisions, access control systems, smart landline phones, consoles and other devices with display functions.

[0124] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A cover plate assembly, characterized in that: The cover plate assembly includes a central area and an edge area surrounding the central area, and the cover plate assembly further includes: A first subassembly comprises a protective film layer, a first fixing portion and a cover plate body arranged in sequence along a thickness direction, wherein the first fixing portion and the cover plate body at least partially overlap with the central area, and the cover plate body is connected to the protective film layer through the first fixing portion; The second subassembly includes a release film layer and a second fixing portion sequentially arranged along the thickness direction, the second fixing portion at least partially overlaps with the edge area, and the viscosity of the second fixing portion is variable, and the second fixing portion is arranged around the cover body.

2. The cover plate assembly according to claim 1, characterized in that: The release film layer also includes a release film body and a gasket portion, the gasket portion at least partially overlaps with the edge area and is arranged between the release film body and the second fixing portion, the gasket portion is arranged around the cover plate body, the gasket portion is connected to the protective film layer through the second fixing portion, and the first subassembly is bonded to the second subassembly.

3. The cover plate assembly according to claim 2, characterized in that: The viscosity of the second fixing portion decreases under ultraviolet ray irradiation or mercury lamp irradiation, the gasket portion is separated from the protective film layer, and the first subassembly is separated from the second subassembly.

4. The cover plate assembly according to claim 2, characterized in that: An orthographic projection area of ​​the second fixing portion on the release film layer is larger than an orthographic projection area of ​​the gasket portion on the release film layer.

5. The cover plate assembly according to claim 2, characterized in that: The dimension of the gasket portion along the thickness direction is greater than or equal to the dimension of the cover plate body along the thickness direction.

6. The cover plate assembly according to claim 3, characterized in that: The second fixing part is an ultraviolet curing type viscosity reducing adhesive or a mercury lamp curing type viscosity reducing adhesive, and the gasket part and the release film body are made of transparent materials.

7. The cover plate assembly according to claim 1, characterized in that: The first fixing portion is optically transparent adhesive.

8. The cover plate assembly according to claim 1, characterized in that: The material of the protective film layer is polyethylene terephthalate.

9. The cover plate assembly according to claim 1, characterized in that: The release film layer is made of polyethylene terephthalate or polyethylene.

10. The cover plate assembly according to claim 1, characterized in that: The cover plate body is made of ultra-thin glass.

11. A method for manufacturing a cover plate assembly, characterized in that: include: A first adhesive is attached to one side of the protective film layer along the thickness direction, wherein the protective film layer includes a central area and an edge area surrounding the central area, and a portion of the first adhesive located in the edge area is removed to obtain a protective film layer subassembly; A cover plate body is arranged on one side of the release film body along the thickness direction, and the cover plate body is located corresponding to the central area; A second adhesive is attached to a side of the cover body away from the release film body, wherein the viscosity of the second adhesive is variable, and a portion of the second adhesive located in the corresponding central area is removed so that the surface of the cover body is exposed between the second adhesives to obtain a release film layer subassembly; The protective film layer subassembly is bonded to the release film layer subassembly to obtain the cover plate assembly, wherein the side of the protective film layer subassembly bonded with the first adhesive is opposite to the side of the release film layer subassembly bonded with the second adhesive, the first adhesive is bonded to the cover plate body to form a first fixing portion, and the second adhesive forms a second fixing portion.

12. The method for manufacturing the cover plate assembly according to claim 11, characterized in that: Before the step of arranging the cover plate body on one side of the release film body along the thickness direction, the step further includes: A cushion layer is arranged on one side of the release film body along the thickness direction, and a portion of the cushion layer corresponding to the central area is cut and removed to obtain a gasket portion arranged around the central area.

13. The method for manufacturing the cover plate assembly according to claim 11, characterized in that: The step of removing part of the second adhesive located in the central area also includes: The process for removing the second adhesive is a plasma cleaning process.

14. A display module, characterized in that: The display module includes a central area and an edge area surrounding the central area, and further includes: A first subassembly comprises a protective film layer, a first fixing portion and a cover plate body which are sequentially arranged along a thickness direction, wherein the first fixing portion and the cover plate body are located in the central area, and the cover plate body is connected to the protective film layer through the first fixing portion; The display panel is attached to a side of the cover body away from the protective film layer.

15. A display device, characterized in that: Comprising the display module as claimed in claim 14.

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