Display module, method for manufacturing display module, and electronic device

Abstract

The display module, the method for manufacturing the display module, and the electronic device provided in the embodiments of the present application can make the adhesion tightness at the edge of the thin film encapsulation layer and the polarizer lower than that at the center by setting the adhesion layer between the thin film encapsulation layer and the polarizer to have different viscosity levels. In this way, the pulling force on the thin film encapsulation layer when the edge of the polarizer expands or contracts can be reduced, thereby reducing the possibility of damage to the thin film encapsulation layer.

Description

Technical Field

[0001] The present application relates to the field of display device manufacturing, and more specifically, to a display module, a method for manufacturing a display module, and an electronic device. Background Art

[0002] In order to prevent water vapor from corroding the organic light-emitting devices of the display module, a thin film encapsulation layer is usually used on the surface of the organic light-emitting device layer to protect the organic light-emitting devices. In addition, in order to solve the impact of reflection from metal electrodes in the screen on the display effect, a polarizer is also set on the thin film encapsulation layer.

[0003] Polarizers are prone to expansion or contraction with changes in ambient temperature and humidity, especially at the edge of the polarizer, which is more susceptible to temperature and humidity due to the presence of cutouts, causing the edge to expand and contract more than the middle area. Based on this, the film encapsulation layer attached to the polarizer is usually thin overall and is easily damaged by the stress of the polarizer. Summary of the invention

[0004] In order to overcome the technical problems mentioned in the above technical background, an embodiment of the present application provides a display module, wherein the display module comprises:

[0005] A display screen, the display screen comprising a thin film encapsulation layer;

[0006] an adhesive layer located on the thin film encapsulation layer, the adhesive layer comprising a first adhesive layer and a second adhesive layer surrounding the first adhesive layer, the adhesiveness of the second adhesive layer being weaker than the adhesiveness of the first adhesive layer;

[0007] The polarizer is located on the side of the adhesive layer away from the thin film encapsulation layer, the center of the polarizer is bonded to the center of the thin film encapsulation layer through the first adhesive layer, and the edge of the polarizer is bonded to the edge of the thin film encapsulation layer through the second adhesive layer.

[0008] In a possible implementation, the display module further includes:

[0009] A cover plate is located on a side of the polarizer away from the adhesive layer.

[0010] In a possible implementation manner, the bonding tightness between the edge of the polarizer close to the cover plate and the cover plate is greater than the bonding tightness between the edge of the polarizer close to the thin film encapsulation layer and the thin film encapsulation layer.

[0011] In a possible implementation, the first adhesive layer includes a pressure-sensitive adhesive layer, and the second adhesive layer includes transparent silica gel or light-curing adhesive.

[0012] Another object of the present application is to provide a method for manufacturing a display module, the method comprising:

[0013] Providing a display screen, the display screen comprising a thin film encapsulation layer;

[0014] The polarizer is bonded to the thin film encapsulation layer through an adhesive layer; wherein the adhesive layer includes a first adhesive layer and a second adhesive layer surrounding the first adhesive layer, the center position of the polarizer is bonded to the center position of the thin film encapsulation layer through the first adhesive layer, the edge of the polarizer is bonded to the edge of the thin film encapsulation layer through the second adhesive layer, and the viscosity of the second adhesive layer is weaker than that of the first adhesive layer.

[0015] In a possible implementation, the step of bonding the polarizer to the thin film encapsulation layer through an adhesive layer includes:

[0016] Laminating the polarizer to the cover plate;

[0017] The side of the polarizer away from the cover plate is bonded to the thin film encapsulation layer through the adhesive layer.

[0018] In a possible implementation, the step of bonding the side of the polarizer away from the cover plate to the thin film encapsulation layer through an adhesive layer includes:

[0019] Disposing the first adhesive layer at the center of the polarizer away from the cover plate;

[0020] Disposing the second adhesive layer at an edge of the polarizer away from the cover plate;

[0021] The side of the polarizer away from the cover plate is adhered to the thin film encapsulation layer through the first adhesive layer and the second adhesive layer.

[0022] In a possible implementation, the step of bonding the side of the polarizer away from the cover plate to the thin film encapsulation layer through an adhesive layer includes:

[0023] Disposing the first adhesive layer at the center of the polarizer away from the cover plate;

[0024] Disposing the second adhesive layer at the edge of the thin film encapsulation layer;

[0025] The side of the polarizer away from the cover plate is adhered to the thin film encapsulation layer through the first adhesive layer and the second adhesive layer.

[0026] In a possible implementation, the step of bonding the side of the polarizer away from the cover plate to the thin film encapsulation layer through an adhesive layer includes:

[0027] Disposing the first adhesive layer at the center of the polarizer away from the cover plate;

[0028] Adhere the side of the polarizer away from the cover plate to the thin film encapsulation layer through the first adhesive layer;

[0029] Adhesive is injected into the edges of the polarizer and the thin film encapsulation layer to form the second adhesive layer.

[0030] Another object of the present application is to provide an electronic device, which includes the display module provided in the present application.

[0031] The display module, the method for manufacturing the display module, and the electronic device provided in the embodiments of the present application can make the adhesion tightness at the edge of the thin film encapsulation layer and the polarizer lower than that at the center by setting the adhesion layer between the thin film encapsulation layer and the polarizer to have different viscosity levels. In this way, the pulling force on the thin film encapsulation layer when the edge of the polarizer expands or contracts can be reduced, thereby reducing the possibility of damage to the thin film encapsulation layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 One of the schematic diagrams of the display module provided in the embodiment of the present application;

[0034] Figure 2 A schematic diagram of an adhesive layer provided in an embodiment of the present application;

[0035] Figure 3 A second schematic diagram of a display module provided in an embodiment of the present application;

[0036] Figure 4 A schematic diagram of the steps of a method for manufacturing a display module provided in an embodiment of the present application;

[0037] Figure 5 One of the schematic diagrams of the manufacturing process of the display module provided in the embodiment of the present application;

[0038] Figure 6 A second schematic diagram of the manufacturing process of the display module provided in the embodiment of the present application;

[0039] Figure 7The third schematic diagram of the manufacturing process of the display module provided in the embodiment of the present application;

[0040] Figure 8 This is a fourth schematic diagram of the manufacturing process of the display module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution 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 part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0044] In the description of this application, it should be noted that the terms "upper", "lower", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0045] It should be noted that, in the absence of conflict, different features in the embodiments of the present application may be combined with each other.

[0046] See also Figure 1 , Figure 1 This is a schematic diagram of a display module provided in this embodiment. The display module may include a display screen 100 , an adhesive layer 200 and a polarizer 300 .

[0047] The display screen 100 may include a light emitting device layer 101 and a thin film encapsulation layer 102 located on the light emitting device layer 101. The light emitting device layer 101 may include an anode layer, an electroluminescent material layer, a cathode layer, etc. The thin film encapsulation layer 102 may be formed by stacking an inorganic sealing layer and an organic buffer layer layer by layer, and the overall thickness of the thin film encapsulation layer 102 may be approximately about 10 um. It is understood that the display screen 100 may also include other components such as an array substrate located on a side of the light emitting device layer 101 away from the thin film encapsulation layer 102.

[0048] The adhesive layer 200 is located on a side of the thin film encapsulation layer 102 away from the light emitting device layer 101. Figure 2 The adhesive layer 200 includes a first adhesive layer 201 and a second adhesive layer 202 surrounding the first adhesive layer 201 .

[0049] The viscosity of the second adhesive layer 202 is weaker than that of the first adhesive layer 201. The first adhesive layer 201 and the second adhesive layer 202 may both be formed of transparent materials. Preferably, the refractive indexes of the first adhesive layer 201 and the second adhesive layer 202 may be substantially similar.

[0050] The first adhesive layer 201 can be used to provide sufficient adhesion to ensure that the polarizer 300 and the display panel are firmly attached. The second adhesive layer 202 can fill the gap to avoid the display effect at the edge of the display module being inconsistent with the display effect at the middle position. At the same time, the second adhesive layer 202 does not have a strong adhesion force, so when the polarizer 300 expands or contracts, the pulling on the thin film encapsulation layer 102 can be reduced.

[0051] In a possible implementation, the first adhesive layer 201 may include a pressure-sensitive adhesive, and the second adhesive layer 202 may include a transparent silicone or a light-curing adhesive.

[0052] The polarizer 300 may be located on a side of the adhesive layer 200 away from the thin film encapsulation layer 102, and the polarizer 300 is bonded to the thin film encapsulation layer 102 through the adhesive layer 200. The center of the polarizer 300 is bonded to the center of the thin film encapsulation layer 102 through the first adhesive layer 201, and the edge of the polarizer 300 is bonded to the edge of the thin film encapsulation layer 102 through the second adhesive layer 202.

[0053] In some possible implementations, the orthographic projection of the thin film encapsulation layer 102 on the display screen 100 may be located within the orthographic projection of the polarizer 300 on the display screen 100. Preferably, the distance between the edge of the orthographic projection of the polarizer 300 on the display screen 100 and the edge of the orthographic projection of the thin film encapsulation layer 102 on the display screen 100 may be 0.05 mm to 0.15 mm.

[0054] Based on the above design, in the display module provided by this embodiment, since the viscosity of the edge position of the adhesive layer 200 is lower than that of the center position, the adhesion density at the edge position between the thin film encapsulation layer 102 and the polarizer 300 can be lower than that at the center position. In this way, the pulling force on the thin film encapsulation layer 102 can be reduced when the edge position of the polarizer 300 expands or contracts, thereby reducing the possibility of damage to the thin film encapsulation layer 102.

[0055] In some possible implementations, the display module may further include a cover plate 400 located on a side of the polarizer 300 away from the adhesive layer 200. The polarizer 300 may be bonded to the cover plate 400 by optically clear adhesive (OCA).

[0056] Further, in this embodiment, the bonding tightness between the edge of the polarizer 300 close to the cover plate 400 and the cover plate 400 is greater than the bonding tightness between the side of the polarizer 300 close to the thin film encapsulation layer 102 and the thin film encapsulation layer 102. For example, the bonding tightness between the central area and the edge area of ​​the polarizer 300 and the cover plate 400 can be the same or similar. In this way, when the bonding tightness between the edge position of the polarizer 300 and the thin film encapsulation layer 102 is small, the bonding tightness between the edge of the polarizer 300 and the cover plate 400 is ensured, so that the edge of the polarizer 300 can be prevented from warping.

[0057] Based on the same inventive concept, this embodiment also provides a method for manufacturing a display module. Figure 4 , Figure 4 This is a schematic flow chart of the steps of the method for manufacturing the display module provided in this embodiment. Each step of the method is described in detail below.

[0058] In step S110 , a display screen 100 is provided. The display screen 100 includes a thin film encapsulation layer 102 .

[0059] Step S120, bonding the polarizer 300 to the thin film encapsulation layer 102 through the adhesive layer 200; wherein the adhesive layer 200 includes a first adhesive layer 201 and a second adhesive layer 202 surrounding the first adhesive layer 201, the center position of the polarizer 300 is bonded to the center position of the thin film encapsulation layer 102 through the first adhesive layer 201, the edge of the polarizer 300 is bonded to the edge of the thin film encapsulation layer 102 through the second adhesive layer 202, and the viscosity of the second adhesive layer 202 is weaker than that of the first adhesive layer 201.

[0060] Therefore, the inventors have found that in the conventional display module manufacturing process, after the polarizer 300 is laminated to the thin film encapsulation layer 102, the cover plate 400 needs to be laminated on the polarizer 300. Since in the solution adopted in this embodiment, the materials of the middle area and the edge area of ​​the adhesive layer 200 are different, and accordingly, the viscosity and hardness thereof are also different, if the polarizer 300 is laminated to the thin film encapsulation layer 102 first and then the cover plate 400 is laminated to the polarizer 300 in the conventional display module manufacturing process, the edge of the polarizer 300 may be warped, and bubbles may be formed between the cover plate 400 and the polarizer 300, thereby affecting the overall display effect of the display module.

[0061] Therefore, in some possible implementations of the present embodiment, when the polarizer 300 is laminated to the thin film encapsulation layer 102 through the adhesive layer 200, the polarizer 300 can be laminated to the cover plate 400 first, and then the side of the polarizer 300 away from the cover plate 400 is laminated to the thin film encapsulation layer 102 through the adhesive layer 200. In this way, the polarizer 300 is laminated to the cover plate 400 first, so that the edge of the polarizer 300 can be guaranteed not to be warped as much as possible.

[0062] Specifically, in a possible implementation, please refer to Figure 5 After the polarizer 300 is attached to the cover plate 400, the first adhesive layer 201 may be disposed at the center of the side of the polarizer 300 away from the cover plate 400, and the second adhesive layer 202 may be disposed at the edge of the side of the polarizer 300 away from the cover plate 400. Then, the side of the polarizer 300 away from the cover plate 400 is attached to the thin film encapsulation layer 102 through the first adhesive layer 201 and the second adhesive layer 202.

[0063] In another possible implementation, see Figure 6After the polarizer 300 is attached to the cover plate 400, the first adhesive layer 201 may be disposed at the center of the side of the polarizer 300 away from the cover plate 400, and the second adhesive layer 202 may be disposed at the edge of the thin film encapsulation layer 102. Then, the side of the polarizer 300 away from the cover plate 400 is attached to the thin film encapsulation layer 102 through the first adhesive layer 201 and the second adhesive layer 202.

[0064] In another possible implementation, please refer to Figure 7 and Figure 8 After the polarizer 300 is attached to the cover plate 400, the first adhesive layer 201 may be provided at the center of the side of the polarizer 300 away from the cover plate 400, and the side of the polarizer 300 away from the cover plate 400 is attached to the thin film encapsulation layer 102 through the first adhesive layer 201. Then, an adhesive is injected into the edges of the polarizer 300 and the thin film encapsulation layer 102 to form the second adhesive layer 202. For example, after the side of the polarizer 300 away from the cover plate 400 is attached to the thin film encapsulation layer 102 through the first adhesive layer 201, a light-curing adhesive is injected into the gap between the edges of the polarizer 300 and the thin film encapsulation layer 102, and then light-curing is performed.

[0065] In addition, the present application also provides an electronic device, which includes the display module provided in the present application.

[0066] In summary, the display module, the method for manufacturing the display module, and the electronic device provided in the embodiments of the present application set the adhesive layer between the thin film encapsulation layer and the polarizer to have different viscosities, so that the adhesive tightness at the edge of the thin film encapsulation layer and the polarizer is lower than the adhesive tightness at the center. In this way, the pulling force on the thin film encapsulation layer when the edge of the polarizer expands or contracts can be reduced, thereby reducing the possibility of damage to the thin film encapsulation layer.

[0067] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A display module, characterized in that: The display module comprises: A display screen, the display screen comprising a thin film encapsulation layer; an adhesive layer located on the thin film encapsulation layer, the adhesive layer comprising a first adhesive layer and a second adhesive layer surrounding the first adhesive layer, the adhesiveness of the second adhesive layer being weaker than the adhesiveness of the first adhesive layer; The polarizer is located on the side of the adhesive layer away from the thin film encapsulation layer, the center of the polarizer is bonded to the center of the thin film encapsulation layer through the first adhesive layer, and the edge of the polarizer is bonded to the edge of the thin film encapsulation layer through the second adhesive layer.

2. The display module according to claim 1, characterized in that: The display module also includes: A cover plate is located on a side of the polarizer away from the adhesive layer.

3. The display module according to claim 2, characterized in that: The bonding tightness between the edge of the polarizer close to the cover plate and the cover plate is greater than the bonding tightness between the edge of the polarizer close to the thin film encapsulation layer and the thin film encapsulation layer.

4. The display module according to claim 1, characterized in that: The first adhesive layer comprises a pressure-sensitive adhesive layer, and the second adhesive layer comprises transparent silica gel or light-curing adhesive.

5. A method for manufacturing a display module, characterized in that: The method comprises: Providing a display screen, the display screen comprising a thin film encapsulation layer; The polarizer is bonded to the thin film encapsulation layer through an adhesive layer; wherein the adhesive layer includes a first adhesive layer and a second adhesive layer surrounding the first adhesive layer, the center position of the polarizer is bonded to the center position of the thin film encapsulation layer through the first adhesive layer, the edge of the polarizer is bonded to the edge of the thin film encapsulation layer through the second adhesive layer, and the viscosity of the second adhesive layer is weaker than that of the first adhesive layer.

6. The method according to claim 5, characterized in that The step of laminating the polarizer to the thin film encapsulation layer through the adhesive layer comprises: Laminating the polarizer to the cover plate; The side of the polarizer away from the cover plate is bonded to the thin film encapsulation layer through the adhesive layer.

7. The method according to claim 6, characterized in that The step of bonding the side of the polarizer away from the cover plate to the thin film encapsulation layer through the adhesive layer comprises: Disposing the first adhesive layer at the center of the polarizer away from the cover plate; Disposing the second adhesive layer at an edge of the polarizer away from the cover plate; The side of the polarizer away from the cover plate is adhered to the thin film encapsulation layer through the first adhesive layer and the second adhesive layer.

8. The method according to claim 6, characterized in that The step of bonding the side of the polarizer away from the cover plate to the thin film encapsulation layer through the adhesive layer comprises: Disposing the first adhesive layer at the center of the polarizer away from the cover plate; Disposing the second adhesive layer at the edge of the thin film encapsulation layer; The side of the polarizer away from the cover plate is adhered to the thin film encapsulation layer through the first adhesive layer and the second adhesive layer.

9. The method according to claim 6, characterized in that The step of bonding the side of the polarizer away from the cover plate to the thin film encapsulation layer through the adhesive layer comprises: Disposing the first adhesive layer at the center of the polarizer away from the cover plate; Adhere the side of the polarizer away from the cover plate to the thin film encapsulation layer through the first adhesive layer; Adhesive is injected into the edges of the polarizer and the thin film encapsulation layer to form the second adhesive layer.

10. An electronic device, characterized in that: The electronic device comprises the display module according to any one of claims 1 to 4.

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