Display module and display device

Abstract

The present application provides a display module and a display device, comprising: a stacked flexible circuit board, a screen body, and a first supporting layer; the flexible circuit board includes a first portion covered by the screen body and a second portion located outside the screen body, and the first end of the screen body is electrically connected to the first portion; wherein the first end portion and / or the first supporting layer adjacent to the first end portion form at least one step portion, the at least one step portion rising in a direction from the screen body toward the first supporting layer and away from a boundary line between the first portion and the second portion; and the orthographic projection of at least part of the boundary line on the flexible circuit board is located at the edge of the orthographic projection of at least one step portion on the flexible circuit board; the display module also includes a sealant located on the side of the flexible circuit board facing the screen body, covering the boundary line, the portion of the flexible circuit board adjacent to the boundary line, and at least part of the step portion. In this way, the probability of intrusion of water vapor and the like can be reduced.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and specifically relates to a display module and a display device. Background Art

[0002] During the production process of the display module, a test circuit electrically connected to the finished product area is generally set up outside the finished product area of ​​the screen body; after the test circuit is used for testing and the test result is qualified, the test circuit outside the finished product area needs to be cut off and the flexible circuit board is electrically connected to the finished product area.

[0003] In order to reduce the probability of water vapor and the like invading the electrical connection position, a sealant is applied to the periphery of the electrical connection position. However, the prior art has the problem that the sealant is not fully applied, and water vapor easily intrudes. Summary of the Invention

[0004] The present application provides a display module and a display device, which can reduce the probability of intrusion of water vapor and the like.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is: providing a display module, comprising: a stacked flexible circuit board, a screen body and a first supporting layer; the flexible circuit board comprises a first part covered by the screen body and a second part located outside the screen body, and the first end of the screen body is electrically connected to the first part; wherein the first end and / or the first supporting layer adjacent to the first end forms at least one step portion, and the at least one step portion rises in the direction of the screen body pointing to the first supporting layer and away from the dividing line between the first part and the second part; and the orthographic projection of at least part of the dividing line on the flexible circuit board is located at the edge of the orthographic projection of at least one step portion on the flexible circuit board; the display module also includes a sealant, which is located on the side of the flexible circuit board facing the screen body, covering the dividing line, part of the flexible circuit board adjacent to the dividing line and at least part of the step portion.

[0006] In order to solve the above technical problems, another technical solution adopted in the present application is: providing a display device comprising the display module described in any of the above embodiments.

[0007] Different from the prior art, the beneficial effects of the present application are as follows: the display module provided by the present application includes a stacked flexible circuit board, a screen body, and a first support layer, and in the length direction of the flexible circuit board, the flexible circuit board includes a first part covered by the screen body and a second part located outside the screen body, and the first end of the screen body is electrically connected to the first part, and at the electrical connection position, the screen body and / or the first support layer form at least one step portion. At least one step portion rises in the direction of the screen body pointing to the first support layer and away from the dividing line between the first part and the second part, and the orthographic projection of at least part of the dividing line on the flexible circuit board is located at the edge of the orthographic projection of at least one step portion on the flexible circuit board. The introduction of the step portion can make the sealant better fill the step portion position, and the sealant better covers the electrical connection position of the flexible circuit board and the screen body, so as to extend the path of water vapor intrusion and ensure the reliability of the electrical connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0009] Figure 1 This is a schematic structural diagram of an embodiment of a display module of the present application;

[0010] Figure 2 for Figure 1 A schematic top view of an embodiment of a display module is shown in FIG.

[0011] Figure 3 for Figure 1 A schematic top view of another embodiment of the display module is shown in FIG.

[0012] Figure 4 This is a schematic structural diagram of another embodiment of the display module of the present application;

[0013] Figure 5 for Figure 4 A schematic top view of an embodiment of a display module is shown in FIG.

[0014] Figure 6 This is a schematic structural diagram of another embodiment of the display module of the present application;

[0015] Figure 7 for Figure 1 A schematic top view of another embodiment of the display module is shown in FIG.

[0016] Figure 8 This is a schematic structural diagram of another embodiment of the display module of the present application;

[0017] Figure 9 for Figure 8 A schematic structural diagram of an embodiment of the middle screen body;

[0018] Figure 10 This is a structural diagram of an embodiment of the display module of the present application. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0020] See also Figure 1 , Figure 1 Schematic diagram of the structure of an embodiment of the display module of the present application. The display module 1 includes a flexible circuit board 10, a screen body 12 and a first support layer 14 which are stacked.

[0021] Specifically, the screen 12 may be an OLED screen, a Micro-LED screen, etc. In the longitudinal direction X of the flexible circuit board 10, the flexible circuit board 10 includes a first portion 100 covered by the screen 12 and a second portion 101 located outside the screen 12. That is, the screen 12 and the flexible circuit board 10 are staggered, and the first end portion 120 of the screen 12 is electrically connected to the first portion 100 of the flexible circuit board 10.

[0022] Optionally, a plurality of first bonding terminals (not shown) are provided on the side of the first end portion 120 of the screen body 12 facing the flexible circuit board 10, and a plurality of second bonding terminals are provided on the side of the first portion 100 of the flexible circuit board 10 facing the screen body 12. The plurality of first bonding terminals and the plurality of second bonding terminals correspond to each other and are electrically connected. Preferably, the plurality of first bonding terminals and the plurality of second bonding terminals can be electrically connected via an ACF anisotropic conductive film. In addition, as Figure 1 As shown, the flexible circuit board 10 includes an insulating substrate 104, a circuit layer 106 and an insulating covering layer 108 that are stacked; wherein the circuit layer 106 includes a plurality of second bonding terminals exposed from the insulating covering layer 108, the insulating covering layer 108 is located on the side of the circuit layer 106 facing the screen body 12, and the insulating substrate 104 is located on the side of the circuit layer 106 away from the screen body 12, and in the length direction X, there is a gap (not marked) between the insulating covering layer 108 and the first end portion 120 of the screen body 12.

[0023] Further, if Figure 1 and Figure 2 As shown, Figure 2 for Figure 1The first end portion 120 and / or the first supporting layer 14 adjacent to the first end portion 120 form at least one step portion 16, which rises in the direction Y from the screen body 12 to the first supporting layer 14 and is away from the boundary line A between the first portion 100 and the second portion 101 (e.g., Figure 2 Furthermore, at least a portion of the orthographic projection of the boundary line A on the flexible circuit board 10 is located at an edge of the orthographic projection of the step portion 16 on the flexible circuit board 10 .

[0024] like Figure 1 As shown, the display module 1 further includes a sealant 18 located on the side of the flexible circuit board 10 facing the screen body 12 , covering the boundary line A, a portion of the flexible circuit board 10 adjacent to the boundary line A, and at least a portion of the step portion 16 .

[0025] The above-mentioned dividing line A can be understood as the intersection position between the screen body 12 and the flexible circuit board 10. Subsequently, water vapor may more easily invade from this position to the position where the first end portion 120 and the first portion 100 are electrically connected. The design method of the above-mentioned step portion 16 rising along the direction Y pointing from the screen body 12 to the first support layer 14 and away from the dividing line A can make the sealant 18 better spread on the surface of the dividing line A and more easily fill the position of the step portion 16; the above-mentioned setting method of at least part of the positive projection of the dividing line A on the flexible circuit board 10 is located at the edge position of the positive projection of the step portion 16 on the flexible circuit board 10, can make the sealant 18 on the surface of the step portion 16 and the sealant 18 at at least part of the position of the dividing line A connect with each other, and the sealant 18 better covers the electrical connection position of the flexible circuit board 10 and the screen body 12, so as to extend the path of water vapor invasion and ensure the reliability of the electrical connection. For example, Figure 1 As shown, compared with the existing vertical path invasion, the solution provided by this application requires water vapor to invade along the vertical path. Figure 1 The L-shaped dotted arrow shows the intrusion path. Obviously, the length of the L-shaped path is longer than the vertical path intrusion, and the L-shaped path has turns, making it difficult for water vapor to invade.

[0026] Alternatively, as Figure 1 As shown, the side of the sealant 18 facing away from the flexible circuit board 10 is arc-shaped, and the arc is convex in the direction away from the flexible circuit board 10. The shape of the sealant 18 is relatively regular and the process is easy to form. Preferably, as Figure 1 As shown, the sealant 18 further covers a portion of the insulating cover layer 108. The process of forming the sealant 18 can be as follows: the sealant 18 is formed at a distance between the insulating cover layer 108 and the screen body 12 along a direction perpendicular to the direction of the insulating cover layer 108. Figure 1 Filling is done in the middle paper direction, that is, the width direction of the flexible circuit board 10, and the sealant 18 will naturally spread to Figure 1 The shape in.

[0027] Please refer again Figure 2 The orthographic projections of all boundary lines A on the flexible circuit board 10 are located at the edge of the orthographic projection of the step portion 16 on the flexible circuit board 10. This design allows the sealant 18 on the surface of the step portion 16 to connect with the sealant 18 at all boundary lines A, thereby further improving the reliability of the electrical connection between the flexible circuit board 10 and the screen body 12.

[0028] Alternatively, as Figure 2 As shown, in the width direction Z of the flexible circuit board 10, the width D1 of the step portion 16 is greater than the width D2 of the dividing line A, but less than the width D3 of the screen body 12. This means that the first end portion of the screen body 12 is still partially covered by the first supporting layer 14. This design improves the reliability of the electrical connection between the flexible circuit board 10 and the screen body 12 while ensuring that the supporting layer 14 provides better support for the screen body 12.

[0029] Alternatively, if Figure 3 As shown, Figure 3 for Figure 1 A schematic top view of another embodiment of the display module is shown in FIG. In the width direction Z of the flexible circuit board 10, the width D1 of the step portion 16 is greater than the width D2 of the dividing line A and equal to the width D3 of the screen body 12. This design improves the reliability of the electrical connection between the flexible circuit board 10 and the screen body 12 while reducing the difficulty of forming the step portion 16.

[0030] On this basis, in one embodiment, please continue to refer to Figure 1 、 Figure 2 and Figure 3 In the longitudinal direction X, the first end portion 120 includes a first side surface 1200 adjacent to the dividing line A, and the first supporting layer 14 includes a second side surface 140 adjacent to the dividing line A. At least a portion of the second side surface 140 is recessed relative to the first side surface 1200 to form at least one step 16. In this embodiment, the step 16 is formed due to the difference in length between the first supporting layer 14 and the screen body 12 in the longitudinal direction X. This design approach is relatively simple to implement and does not significantly impact the existing structure of the screen body 12. Of course, in other embodiments, the step 16 may also be formed on the first side surface 1200 of the screen body 12, and this application is not limited thereto.

[0031] Alternatively, as Figure 1 and Figure 3 As shown, all the second side surfaces 140 are retracted relative to the first side surface 1200 to form a step portion 16. Generally speaking, the step portion 16 comprises a bottom surface 162 and a vertical surface 160 connected to each other. Figure 1As shown, the bottom surface 162 of the step portion 16 may be the area where the first end portion 120 of the screen body 12 faces the first supporting layer 14 and is exposed from the first supporting layer 14 ; the vertical surface 160 of the step portion 16 may be the inwardly retracted second side surface 140 .

[0032] Of course, in other embodiments, such as Figure 4 and Figure 5 As shown, Figure 4 This is a structural diagram of another embodiment of the display module of this application. Figure 5 for Figure 4 The schematic top view of one embodiment of the module is shown in FIG. All second side surfaces 140 are retracted relative to the first side surface 1200 to form at least two step portions 16. For example, Figure 4 As shown, the first supporting layer 14 includes a first sub-supporting layer 142 and a second sub-supporting layer 144 stacked together. The sub-side surfaces of the first sub-supporting layer 142 and the second sub-supporting layer 144 adjacent to the first end 120 together constitute the second side surface 140; wherein the sub-side surface of the first sub-supporting layer 142 is retracted relative to the first side surface 1200 to form a first step portion 16. In this case, the bottom surface 162 of the first step portion 16 can be the side of the first end 120 of the screen body 12 facing the first sub-supporting layer 142 and exposed from the first sub-supporting layer 142; the vertical surface 160 of the first step portion 16 can be the retracted sub-side surface of the first sub-supporting layer 142. Furthermore, the sub-side surface of the second sub-support layer 144 is retracted relative to the sub-side surface of the first sub-support layer 142 to form a second step portion 16. At this time, the bottom surface 162 of the second step portion 16 can be the side of the first sub-support layer 142 facing the second sub-support layer 144 and the area exposed from the second sub-support layer 144; the vertical surface 160 of the second step portion 16 can be the sub-side surface of the retracted second sub-support layer 144.

[0033] Optionally, the first sub-support layer 142 and the second sub-support layer 144 can be integrally formed. The step portion 16 can be formed in a relatively simple manner, for example, by simple laser cutting. The design of the multiple step portions 16 can enhance the bonding strength between the sealant 18 and the second side surface 140 of the first support layer 14, while also further reducing the probability of moisture intrusion from the interface between the sealant 18 and the second side surface 140 of the first support layer 14.

[0034] Alternatively, if Figure 6 As shown, Figure 6This is a structural diagram of another embodiment of the display module of the present application. In the direction Y from the screen body 12 to the first supporting layer 14, the second side surface 140 of the first supporting layer 14 away from the screen body 12 is retracted relative to the first side surface 1200 to form a step portion 16. It can be considered that the step portion 16 is a groove formed on the side of the first supporting layer 14 away from the screen body 12, and the depth of the groove is less than the thickness of the first supporting layer 14. That is, in this embodiment, the step portion 16 does not pass through the first supporting layer 14. This design method can ensure the supporting effect of the first supporting layer 14 on the screen body 12 and reduce the impact on the screen body 12 during the formation of the step portion 16. At this time, the bottom surface 162 of the step portion 16 is the bottom of the groove formed on the side of the first supporting layer 14 away from the screen body 12, and the vertical surface 160 of the step portion 16 is the side wall of the groove formed on the side of the first supporting layer 14 away from the screen body 12 (that is, the retracted second side surface 140).

[0035] See also Figure 7 , Figure 7 for Figure 1 : A top view schematic diagram of another embodiment of the display module. The first side surface 1200 located at the position of the dividing line A has a first concave-convex structure (not marked). Optionally, all first side surfaces 1200 have the first concave-convex structure. The small grooves in the first concave-convex structure can form a capillary effect, and the sealant 18 can penetrate into the small grooves under the capillary action, so that the bonding force between the sealant 18 and the first side surface 1200 at the position of the dividing line A is greater, and the probability of forming a gap between the two is lower, so as to reduce the probability of water vapor intrusion. Of course, in other embodiments, only the first side surface 1200 located at the dividing line A may have the first concave-convex structure, and the first side surface 1200 located outside the dividing line A may be a plane.

[0036] Optionally, the orthographic projection of the first concave-convex structure on the flexible circuit board 10 includes at least one of a sawtooth shape and a wave shape. The first concave-convex structure is relatively simple and can be easily prepared and formed.

[0037] Please continue reading Figure 1 and Figure 7 The stepped portion 16 includes a bottom surface 162 and a vertical surface 160 that are interconnected. The second side surface 140 that forms the vertical surface 160 has a second concave-convex structure (not shown). The small grooves in this second concave-convex structure can create a capillary effect, allowing the sealant 18 to penetrate deeply into the small grooves, thereby increasing the contact force between the sealant 18 and the vertical surface 160 and reducing the probability of a gap forming between the two.

[0038] Optionally, the orthographic projection of the second concave-convex structure on the flexible circuit board 10 includes at least one of a sawtooth shape and a wave shape. The second concave-convex structure is relatively simple and can be easily prepared and formed.

[0039] In this embodiment, the first concave-convex structure and the second concave-convex structure can be formed by laser cutting or the like. Figure 1 As shown in , the second concave-convex structure can be formed after the first supporting layer 14 is disposed on the screen body 12. When forming the second concave-convex structure, the energy of the laser cutting can be controlled so that the laser does not act on the bottom surface 162 connected to the vertical surface 160. Of course, in other embodiments, the second concave-convex structure can also be formed in advance before the first supporting layer 14 is disposed on the screen body 12, and this application is not limited to this.

[0040] like Figure 8 As shown, Figure 8 This is a schematic diagram of the structure of another embodiment of the display module of the present application. A groove 164 is provided on the side of the bottom surface 162 facing the facade 160, and the orthographic projection of the second concave-convex structure on the bottom surface 162 is located within the groove 164. Optionally, the orthographic projection of the second concave-convex structure on the bottom surface 162 has the same shape as the groove 164; the depth of the groove 164 is less than the thickness of the screen 12 or support layer 14 at the corresponding position on the bottom surface 162. This design allows the sealant 18 to penetrate deeper into the groove 164 due to capillary action, thereby increasing the bonding strength between the sealant 18 and the bottom surface 162 and reducing the probability of moisture intrusion.

[0041] In a specific application scenario, such as Figure 8 As shown, at least a portion of the second side surface 140 adjacent to the dividing line (not marked) is retracted relative to the first side surface 1200 to form a step portion 16, and the side of the screen body 12 facing the first support layer 14 forms a bottom surface 162. Figure 9 , Figure 9 for Figure 8 Schematic diagram of the structure of one embodiment of the screen. The screen 12 includes a substrate layer 124, which contacts the first support layer 14. A groove 164 is located on the substrate layer 124. Generally speaking, in addition to the substrate layer 124, the screen 12 may also include an array layer 126, a light-emitting layer 128, and an encapsulation layer 121, which are sequentially stacked on one side of the substrate layer 124. The side of the substrate layer 124 facing away from the array layer 126 contacts the first support layer 14. The design of the groove 164 located on the substrate layer 124 can reduce the impact of the groove 164 on the pixel driving circuit in the array layer 126.

[0042] Optionally, the substrate layer 124 includes a shielding layer 1240, and the groove 164 ends at the shielding layer 1240. The introduction of the shielding layer 1240 can prevent the laser from passing through the shielding layer 1240 and affecting the film layer below the shielding layer 1240 during laser cutting, so as to more effectively control the depth of the groove 164.

[0043] In one embodiment, the shielding layer 1240 may be made of a laser absorbing material, such as metal, etc. The shielding layer 1240 absorbs the laser light to prevent the laser light from passing through the shielding layer 1240 and affecting the film layer below the shielding layer 1240 .

[0044] In another embodiment, the substrate layer 124 may include a first substrate sublayer and a second substrate sublayer stacked together, and the shielding layer 1240 may be located between the first and second substrate sublayers. Optionally, the first and second substrate sublayers may be made of polyimide or the like.

[0045] See also Figure 10 , Figure 10 This is a schematic diagram of the structure of one embodiment of the display module of the present application. The screen 12 includes a display portion 123, a bent portion 125, and an extension portion 127, which are sequentially connected. The display portion 123 and the extension portion 127 are opposite and spaced apart. The extension portion 127 includes a first end portion 120. The first supporting layer 14 is located on the side of the extension portion 127 facing the display portion 123, and the flexible circuit board 10 is located on the side of the extension portion 127 facing away from the display portion 123.

[0046] Optionally, the display module 1 may further include a second supporting layer 11 and a spacer block 13 ; wherein the second supporting layer 11 is stacked on the side of the display portion 123 facing the extension portion 127 ; and the spacer block 13 is stacked between the first supporting layer 14 and the second supporting layer 11 .

[0047] In addition, the present application also provides a display device, which may include the display module mentioned in any of the above embodiments. The display device may be a mobile phone, a tablet, etc.

[0048] The above description is merely an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A display module, characterized in that: include: A flexible circuit board, a screen body, and a first supporting layer are stacked; in the longitudinal direction of the flexible circuit board, the flexible circuit board includes a first portion covered by the screen body and a second portion located outside the screen body, and a first end portion of the screen body is electrically connected to the first portion; wherein the first end portion and / or the first supporting layer adjacent to the first end portion forms at least one step portion, the at least one step portion rising in a direction from the screen body toward the first supporting layer and away from a boundary line between the first portion and the second portion; and an orthographic projection of at least part of the boundary line on the flexible printed circuit board is located at an edge of an orthographic projection of the at least one step portion on the flexible printed circuit board; The display module further includes a sealant located on a side of the flexible circuit board facing the screen body, covering the dividing line, a portion of the flexible circuit board adjacent to the dividing line, and at least a portion of the step portion; Wherein, in the length direction, the first end portion includes a first side surface adjacent to the dividing line, and the first supporting layer includes a second side surface adjacent to the dividing line; wherein at least a portion of the second side surface is retracted relative to the first side surface to form at least one step portion; At the same time, the step portion includes a bottom surface and a vertical surface connected to each other, the second side surface forming the vertical surface has a second concave-convex structure, the bottom surface is provided with a groove on the side facing the vertical surface, and the orthographic projection of the second concave-convex structure on the bottom surface is located in the groove.

2. The display module according to claim 1, wherein: The orthographic projections of all the boundary lines on the flexible circuit board are located at the edge of the orthographic projection of at least one step portion on the flexible circuit board.

3. The display module according to claim 2, wherein: In the width direction of the flexible circuit board, the width of the step portion is greater than the width of the dividing line and is less than or equal to the width of the screen body.

4. The display module according to claim 1, wherein: All of the second side surfaces are retracted relative to the first side surface to form at least one step portion; Alternatively, in the direction from the screen body to the first supporting layer, the second side surface of the first supporting layer at a portion away from the screen body is retracted relative to the first side surface to form the step portion.

5. The display module according to claim 1, wherein: The first side surface at the boundary line position has a first concave-convex structure.

6. The display module according to claim 5, wherein: The orthographic projection of the first concave-convex structure on the flexible circuit board includes at least one of a sawtooth shape and a wave shape.

7. The display module according to claim 1, wherein: The orthographic projection of the second concave-convex structure on the flexible circuit board includes at least one of a sawtooth shape and a wave shape.

8. The display module according to claim 1, wherein: At least a portion of the second side surface adjacent to the dividing line is retracted relative to the first side surface to form a step portion, and the side of the screen body facing the first supporting layer forms the bottom surface; Wherein, the screen body includes a substrate layer, and the groove is located on the substrate layer.

9. The display module according to claim 8, wherein: The substrate layer includes a blocking layer, and the groove ends at the blocking layer.

10. The display module according to claim 1, wherein: The sealant has an arc shape on a side facing away from the flexible circuit board, and the arc shape is convex in a direction away from the flexible circuit board; and / or, The screen body includes a display portion, a bending portion and an extension portion connected in sequence, and the display portion and the extension portion are arranged opposite to each other and at intervals, and the extension portion includes the first end portion; the first supporting layer is located on the side of the extension portion facing the display portion, and the flexible circuit board is located on the side of the extension portion facing away from the display portion.

11. A display device, characterized in that: A display module comprising any one of claims 1-10.

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