Display module, preparation method thereof and display device

Abstract

The application provides a display module, a preparation method thereof and a display device. The display module comprises a display panel, a first optical adhesive layer, a polarizer, a second optical adhesive layer and a cover plate. The first optical adhesive layer is arranged on the light-out surface of the display panel. The polarizer is arranged on the side surface of the first optical adhesive layer away from the light-out surface. The second optical adhesive layer is arranged on the side surface of the polarizer away from the first optical adhesive layer. The cover plate is bonded to the side surface of the polarizer away from the first optical adhesive layer through the second optical adhesive layer. The orthographic projection of the polarizer on the display panel is located within the orthographic projection of the first optical adhesive layer on the display panel, and the orthographic projection of the polarizer on the display panel is located within the orthographic projection of the second optical adhesive layer on the display panel. In the reliability process such as the sweat test, the display module can avoid the problem that the side wall surface of the polarizer contacts sweat to cause discoloration failure, thereby being beneficial to improving the display effect and reliability of the display module.

Description

Technical Field

[0001] This application relates to the field of display module technology, and in particular to a display module, its manufacturing method, and a display device. Background Technology

[0002] OLED (Organic Light-Emitting Diode) display panels possess a range of advantages, including self-illumination, wide viewing angles, light weight, thinness, high brightness, low power consumption, and fast response. Therefore, OLED display panels have become very popular display devices both domestically and internationally, with broad application prospects. Typically, optical elements such as polarizers are placed on the light-emitting side of the display panel to form a display module, thereby ensuring that the display module meets optical display requirements.

[0003] When conducting environmental and other reliability tests, display modules in related technologies often exhibit display abnormalities. Summary of the Invention

[0004] This application provides a display module, its manufacturing method, and a display device to solve the problem of display abnormalities occurring in display modules during reliability tests in related technologies.

[0005] In a first aspect, embodiments of this application provide a display module, including: a display panel, a first optical adhesive layer, a polarizer, a second optical adhesive layer, and a cover plate. The first optical adhesive layer is disposed on the light-emitting surface of the display panel; the polarizer is disposed on a side surface of the first optical adhesive layer opposite to the light-emitting surface; the second optical adhesive layer is disposed on a side surface of the polarizer opposite to the first optical adhesive layer; the cover plate is bonded to the side surface of the polarizer opposite to the first optical adhesive layer via the second optical adhesive layer; wherein the orthographic projection of the polarizer on the display panel is located within the orthographic projection of the first optical adhesive layer on the display panel, and the orthographic projection of the polarizer on the display panel is located within the orthographic projection of the second optical adhesive layer on the display panel.

[0006] In some embodiments, the polarizer includes a sidewall surface, the plane of which intersects the plane of which the light-emitting surface is located, wherein: the orthographic projection area of ​​the polarizer on the display panel is smaller than the orthographic projection area of ​​the first optical adhesive layer on the display panel, and / or, the orthographic projection area of ​​the polarizer on the display panel is smaller than the orthographic projection area of ​​the second optical adhesive layer on the display panel, so that the sidewall surface and at least one of the first optical adhesive layer and the second optical adhesive layer form an avoidance space.

[0007] In some embodiments, the orthographic projection area of ​​the polarizer on the display panel is smaller than the orthographic projection area of ​​the first optical adhesive layer on the display panel, and the orthographic projection area of ​​the polarizer on the display panel is smaller than the orthographic projection area of ​​the second optical adhesive layer on the display panel. The orthographic projections of the first optical adhesive layer and the second optical adhesive layer on the display panel completely overlap, so as to form the clearance space between the outer side of the polarizer and the first and second optical adhesive layers.

[0008] In some embodiments, the display module further includes a third optical adhesive layer disposed on the sidewall surface, wherein the third optical adhesive layer is located at least in the clearance space.

[0009] In some embodiments, the third optical adhesive layer is annular and surrounds the sidewall surface;

[0010] Preferably, the first optical adhesive layer includes a first outer surface, the second optical adhesive layer includes a second outer surface, and the third optical adhesive layer includes a third outer surface away from the sidewall. Any one of the plane containing the first outer surface, the plane containing the second outer surface, and the plane containing the third outer surface intersects the plane containing the light-emitting surface, wherein the third outer surface is flush with the first outer surface and the third outer surface is flush with the second outer surface.

[0011] In some embodiments, the width of the third optical adhesive layer is equal to the thickness of the polarizer, and the width of the third optical adhesive layer is the dimension of the third optical adhesive layer in the thickness direction of the display panel;

[0012] Preferably, the thickness of the third optical adhesive layer is 0.1 mm to 0.4 mm, and the thickness of the third optical adhesive layer is the dimension of the third optical adhesive layer in the direction perpendicular to the thickness direction of the display panel.

[0013] In some embodiments, the display panel includes a substrate, wherein the orthographic projection of the first optical adhesive layer on the substrate lies within the orthographic projection of the light-emitting surface on the substrate;

[0014] Preferably, the orthographic projection of the third optical adhesive layer on the substrate is located within the substrate;

[0015] Preferably, the light-receiving surface of the display panel is provided with a carrier layer and a functional layer, the carrier layer is located between the display panel and the functional layer, and the orthographic projection of the functional layer on the display panel is located within the orthographic projection of the carrier layer on the display panel;

[0016] Preferably, the orthographic projection of the third optical adhesive layer on the display panel is located within the orthographic projection of the carrier layer on the display panel, and the orthographic projection of the third optical adhesive layer on the display surface is located outside the orthographic projection of the functional layer on the display panel.

[0017] In some embodiments, the thickness of the first optical adhesive layer is less than or equal to the thickness of the second optical adhesive layer;

[0018] Preferably, the thickness of the first optical adhesive layer is 50 μm to 150 μm;

[0019] Preferably, the thickness of the second optical adhesive layer is 100μm to 220μm.

[0020] Secondly, embodiments of this application also provide a method for manufacturing a display module, used to manufacture a display module as described in the first aspect above, the method comprising:

[0021] A first optical adhesive layer is formed on the light-emitting surface of the display panel;

[0022] A polarizer is formed on the surface of the first optical adhesive layer that is opposite to the light-emitting surface;

[0023] A second optical adhesive layer is formed on the surface of the polarizer that is opposite to the first optical adhesive layer;

[0024] A cover plate is formed on the surface of the second optical adhesive layer facing away from the polarizer to form the display module.

[0025] Thirdly, embodiments of this application also provide a display device, including a display module and an outer frame as described in the first aspect above. The display module is disposed inside the outer frame. The light-receiving surface of the display panel is provided with a carrier layer and a functional layer. The carrier layer is located between the display panel and the functional layer. The outer frame is bonded to the display panel and the carrier layer through the functional layer.

[0026] The beneficial effects of the display module provided in this application are as follows: Compared with related technologies, this application provides a first optical adhesive layer between the light-emitting surface of the display panel and the polarizer, while a second optical adhesive layer is provided on the side of the polarizer facing away from the first optical adhesive layer. In other words, one side of the polarizer in the thickness direction of the display panel is bonded to the light-emitting surface of the display panel through the first optical adhesive layer, and the other side of the polarizer is bonded to the cover plate through the second optical adhesive layer. This not only ensures a firm connection between the polarizer and the display panel and the cover plate, but also allows the first and second optical adhesive layers to deform during reliability testing of the display panel. This ensures that both sides of the polarizer in the thickness direction of the display panel are simultaneously protected by the first and second optical adhesive layers, reducing the probability of polarizer deformation failure. Furthermore, this design prevents the outer surface of the polarizer, i.e., the sidewall, from being directly exposed to the external environment, thus blocking moisture. During reliability testing such as sweat tests, this prevents the sidewall of the polarizer from contacting sweat and causing fading failure, thereby improving the display effect and reliability of the display module. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a partial structural schematic diagram of a display module provided in some embodiments of this application;

[0029] Figure 2 These are schematic diagrams of the display panel structure provided in some embodiments of this application;

[0030] Figure 3 This is a partial structural schematic diagram of a display module provided in other embodiments of this application;

[0031] Figure 4 This is a flowchart illustrating the manufacturing method of the display module in some embodiments of this application;

[0032] Figure 5 for Figure 1 The flowchart shows the fabrication method of the display module.

[0033] Figure label:

[0034] 10. Display panel; 11. Substrate; 12. Anode; 13. Hole transport layer; 14. Organic light-emitting layer; 141. Light-emitting area; 142. Non-light-emitting area; 15. Electron transport layer; 16. Cathode; 17. Encapsulation layer;

[0035] 20. First optical adhesive layer; 30. Polarizing film; 40. Second optical adhesive layer; 50. Cover plate; 60. Third optical adhesive layer; 70. Supporting layer; 80. Functional layer. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection" and "joining" should be interpreted broadly, for example, as fixed connection, detachable connection, or integral connection; those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0040] OLED (Organic Light-Emitting Diode) display panels possess a range of advantages, including self-illumination, wide viewing angles, light weight, thinness, high brightness, low power consumption, and fast response. Therefore, OLED display modules, which include OLED display panels, have become very popular display devices both domestically and internationally, with broad application prospects. Typically, a display module is formed by placing a polarizer, optical adhesive, and cover plate on the light-emitting side of the display panel, thereby ensuring that the display module meets optical display requirements.

[0041] In some manufacturing processes of display modules in related technologies, a polarizer is placed on the light-emitting side of the display panel, and then a cover plate is bonded to the polarizer using an optical adhesive layer. This combination of the optical adhesive layer and the cover plate protects both the polarizer and the display panel. However, during reliability tests, such as environmental tests, this manufacturing method can lead to cracks in the display panel or delamination between the polarizer and the display panel, resulting in display module malfunctions.

[0042] To address the aforementioned problems, embodiments of this application provide a display module, such as... Figure 1 and Figure 2 As shown, the display module includes: a display panel 10, a first optical adhesive layer 20, a polarizer 30, a second optical adhesive layer 40, and a cover plate 50. The first optical adhesive layer 20 is disposed on the light-emitting surface of the display panel 10; the polarizer 30 is disposed on the first optical adhesive layer 20 away from the light-emitting surface. Figure 1 One side surface of the upper surface of the display panel 10 ( Figure 1 The first optical adhesive layer 20 is placed on the upper surface of the polarizer 30; the second optical adhesive layer 40 is disposed on the side surface of the polarizer 30 facing away from the first optical adhesive layer 20; the cover plate 50 is bonded to the side surface of the polarizer 30 facing away from the first optical adhesive layer 20 through the second optical adhesive layer 40; that is, the display module includes, from bottom to top, a display panel 10, a first optical adhesive layer 20, a polarizer 30, a second optical adhesive layer 40 and a cover plate 50 stacked in sequence; wherein, the orthographic projection of the polarizer 30 on the display panel 10 is located within the orthographic projection of the first optical adhesive layer 20 on the display panel 10, and the orthographic projection of the polarizer 30 on the display panel 10 is located within the orthographic projection of the second optical adhesive layer 40 on the display panel 10.

[0043] The aforementioned display panel 10 can be a rigid display panel or a flexible display panel. The display panel 10 can be, but is not limited to, an organic light-emitting diode (OLED) display panel. An OLED display panel 10 consists of a thin, transparent indium tin oxide (ITO) substrate with semiconductor properties, connected to a positive electrode, and another metal cathode, forming a sandwich-like structure. Specifically, as... Figure 2 As shown, the OLED display panel includes a substrate 11, an anode 12, a hole transport layer 13 (HTL), an organic light-emitting layer 14 (EL), an electron transport layer 15 (ETL), a cathode 16, and an encapsulation layer 17, arranged sequentially from bottom to top. The organic light-emitting layer 14 includes light-emitting regions 141 and non-light-emitting regions 142, which are arranged alternately.

[0044] The aforementioned cover plate 50 serves to protect the polarizer 30, which helps improve the overall reliability of the display module. The cover plate 50 can be, but is not limited to, cover glass.

[0045] The aforementioned polarizer 30 is an optical thin film that can convert natural light (unpolarized light) into linearly polarized light, and is widely used in display modules, eyeglasses, photographic filters, optical instruments and other fields.

[0046] The polarizer 30 is typically composed of multiple layers of materials, with key components including: a polarizing layer, a protective layer, an adhesive, and a phase compensation film. The core material of the polarizing layer (such as iodine-containing polyvinyl alcohol PVA) is stretched and dyed to orient the molecules and form polarization characteristics. The protective layer has triacetate cellulose (TAC) films bonded to both sides of the PVA to prevent moisture or damage. The adhesive is used to bond the polarizer 30 to other components (such as the display panel 10). The phase compensation film improves viewing angle or color performance and can be selected or omitted depending on the actual situation.

[0047] The first optical adhesive layer 20 not only bonds the polarizer 30 and the cover plate 50, but also protects the polarizer 30. During reliability tests on the display module, such as airtightness tests, the first optical adhesive layer 20 deforms, reducing the lateral force on the bonding surface between the polarizer 30 and the cover plate 50, and lowering the probability of appearance defects caused by air bubbles between the polarizer 30 and the cover plate 50.

[0048] The second optical adhesive layer 40 not only bonds the display panel 10 and the polarizer 30, but also protects the polarizer 30. During reliability tests on the display module, such as airtightness tests, the second optical adhesive layer 40 deforms, reducing the lateral force on the surface where the polarizer 30 is bonded to the display panel 10, and lowering the probability of appearance defects caused by air bubbles between the polarizer 30 and the display panel 10.

[0049] The aforementioned orthographic projection refers to the projection along the thickness direction of the display panel 10. The orthographic projection of the polarizer 30 on the display panel 10 lies within the orthographic projection of the first optical adhesive layer 20 on the display panel 10. This includes the complete overlap between the orthographic projection of the first optical adhesive layer 20 on the display panel 10 and the orthographic projection of the polarizer 30 on the display panel 10 (the two orthographic projections are identical, i.e., equal in area and relatively overlapping), and the fact that the area of ​​the orthographic projection of the first optical adhesive layer 20 on the display panel 10 is larger than the area of ​​the orthographic projection of the polarizer 30 on the display panel 10, so that the orthographic projection of the first optical adhesive layer 20 on the display panel 10 can completely cover the orthographic projection of the polarizer 30 on the display panel 10. The orthographic projection of the polarizer 30 on the display panel 10 is located within the orthographic projection of the second optical adhesive layer 40 on the display panel 10. This includes the complete overlap between the orthographic projection of the second optical adhesive layer 40 on the display panel 10 and the orthographic projection of the polarizer 30 on the display panel 10 (the two orthographic projections are identical, have equal areas, and are relatively overlapping). The area of ​​the orthographic projection of the second optical adhesive layer 40 on the display panel 10 is larger than the area of ​​the orthographic projection of the polarizer 30 on the display panel 10, so that the orthographic projection of the second optical adhesive layer 40 on the display panel 10 can completely cover the orthographic projection of the polarizer 30 on the display panel 10. Therefore, the orthographic projection of the polarizer 30 on the display panel 10 lies within the orthographic projection of the first optical adhesive layer 20 on the display panel 10, and the orthographic projection of the polarizer 30 on the display panel 10 lies within the orthographic projection of the second optical adhesive layer 40 on the display panel 10. This means that the combination of the above situations ultimately ensures that the orthographic projection of the first optical adhesive layer 20 on the display panel 10 completely covers the orthographic projection of the polarizer 30 on the display panel 10, and the orthographic projection of the second optical adhesive layer 40 on the display panel 10 completely covers the orthographic projection of the polarizer 30 on the display panel 10. In this way, the outer surface of the polarizer 30, i.e., the sidewall, is not directly exposed to the external environment, which can block moisture and prevent fading failure caused by contact with sweat during reliability tests such as sweat tests.

[0050] Both the first optical adhesive layer 20 and the second optical adhesive layer 40 can be referred to as optical adhesive layers. The materials used in the first optical adhesive layer 20 and the second optical adhesive layer 40 can be the same or different. This simplifies the manufacturing process of the first optical adhesive layer 20 and the second optical adhesive layer 40, and helps to reduce the cost of the first optical adhesive layer 20 and the second optical adhesive layer 40.

[0051] In this embodiment, the material used in the first optical adhesive layer 20 and the material used in the second optical adhesive layer 40 are the same, and both are referred to as optical adhesive layers, for the purpose of explanation.

[0052] In display modules, the aforementioned optically clear adhesive (OCA) layer is a key material, primarily used to bond different optical layers (such as touchscreens, display panels 10, cover plates 50, etc.) while ensuring high light transmittance, low haze, and reducing interface reflection. Depending on the application scenario, this optical adhesive layer may be selected from optically clear adhesive (OCA), optically clear liquid adhesive (OCR), or pressure-sensitive adhesive (PSA).

[0053] The aforementioned optically clear adhesive (OCA) is a solid adhesive film that is laminated using a lamination process and is commonly used for bonding touch screens to display panels 10.

[0054] The aforementioned optically transparent liquid adhesive (OCR) is a liquid-curing adhesive that is cured by UV or heat and is suitable for curved or irregularly shaped structures (such as flexible screens).

[0055] The pressure-sensitive adhesive (PSA) mentioned above has instant tack and is used for temporary fixation or low-requirement bonding scenarios.

[0056] The beneficial effects of the display module provided in this application are as follows: Compared with related technologies, this application provides a first optical adhesive layer 20 between the light-emitting surface of the display panel 10 and the polarizer 30, while a second optical adhesive layer 40 is provided on the side of the polarizer 30 facing away from the first optical adhesive layer 20. In other words, one side of the polarizer 30 in the thickness direction of the display panel 10 is bonded to the light-emitting surface of the display panel 10 through the first optical adhesive layer 20, and the other side of the polarizer 30 is bonded to the cover plate 50 through the second optical adhesive layer 40. This not only ensures a firm connection between the polarizer 30 and the display panel 10 and the cover plate 50, but also... During reliability testing of the display panel 10, the first optical adhesive layer 20 and the second optical adhesive layer 40 can deform, so that both sides of the polarizer 30 in the thickness direction of the display panel 10 are simultaneously protected by the first optical adhesive layer 20 and the second optical adhesive layer 40, reducing the probability of polarizer 30 deformation failure. At the same time, through the above setting, the side wall of the polarizer 30 is prevented from being directly exposed to the external environment, which can block moisture. During reliability testing such as sweat testing, the side wall of the polarizer 30 is prevented from contacting sweat and causing fading failure, thereby improving the display effect and reliability of the display module.

[0057] During the display module design process, the orthographic projection of the first optical adhesive layer 20 on the substrate 11 is located within the orthographic projection of the light-emitting surface on the substrate. In other words, when the first optical adhesive layer 20 is installed, it cannot protrude beyond the display panel 10, specifically, it cannot protrude beyond the substrate 11.

[0058] In the display module design process, the shape and size of the orthographic projection of the first optical adhesive layer 20 and the second optical adhesive layer 40 on the display panel 10 are quite important.

[0059] The shape of the orthographic projection of the first optical adhesive layer 20 on the display panel 10 is the same as the shape of the orthographic projection of the second optical adhesive layer 40 on the display panel 10. The orthographic projection areas of the first optical adhesive layer 20 and the second optical adhesive layer 40 on the display panel 10 may be the same or different, as long as they can completely cover the orthographic projection of the polarizer 30 on the display panel 10.

[0060] In the following text, assuming that the display panel 10 is square, the shapes of the orthographic projections of the polarizer 30, the first optical adhesive layer 20, and the second optical adhesive layer on the display panel 10 are all square, will be used as examples for explanation.

[0061] like Figure 1 As shown, in some embodiments, when the shape of the orthographic projection of the first optical adhesive layer 20 on the display panel 10 and the shape of the orthographic projection of the second optical adhesive layer 40 on the display panel 10 are the same, the orthographic projection of the first optical adhesive layer 20 on the display panel 10 and the orthographic projection of the second optical adhesive layer 40 on the display panel 10 completely coincide, that is, the outer surface of the second optical adhesive layer 40 is flush with or coplanar with the outer surface of the first optical adhesive layer 20.

[0062] like Figure 1 As shown, in this embodiment, the polarizer 30 includes a sidewall surface, which refers to the outer surface of the polarizer 30 near the edge area of ​​the display panel 10. Typically, the sidewall surface of the polarizer 30 intersects with the light-emitting surface of the display panel 10. Furthermore, the sidewall surface is perpendicular to the light-emitting surface of the display panel 10. The following description uses the example of the sidewall surface being perpendicular to the light-emitting surface of the display panel 10.

[0063] The projected area of ​​the polarizer 30 on the display panel 10 is smaller than the projected area of ​​the first optical adhesive layer 20 on the display panel 10. This projected area is a simplified term for the projected area of ​​the polarizer. This results in a clearance space formed between the sidewall of the polarizer 30 and the first and second optical adhesive layers 40.

[0064] With the above configuration, the polarizer 30 is recessed and sandwiched between the first optical adhesive layer 20 and the second optical adhesive layer 40. In this way, in laboratory settings such as the display module, the distance between the polarizer 30 and external substances such as water vapor is increased, reducing the probability of polarizer 30 failure and thus improving the reliability of polarizer 30, thereby improving the display effect of the display module.

[0065] In the display module design process, the thickness of the first optical adhesive layer 20 and the thickness of the second optical adhesive layer 40 are important parameters. Since the function of the second optical adhesive layer 40 is to connect the polarizer 30 and the cover plate 50, the thickness of the second optical adhesive layer 40 cannot be too thin, otherwise it will affect the firmness of the connection between the polarizer 30 and the cover plate 50. At the same time, although the first optical adhesive layer 20 also serves to connect the polarizer 30 and the display panel 10, since the polarizer 30 can be directly bonded to the display panel 10, in this application, the main function of the first optical adhesive layer 20, in addition to bonding the polarizer 30 and the display panel 10, is to protect the polarizer 30. Therefore, the thickness of the first optical adhesive layer 20 can be reduced accordingly compared to the thickness of the second optical adhesive layer 40. Through multiple tests, it was found that the thickness of the first optical adhesive layer 20 in this embodiment can be 50μm, 60μm, 70μm, 80μm, ..., 100μm, 110μm, ..., 150μm, satisfying the range of 50μm to 150μm; the thickness of the second optical adhesive layer 40 can be 100μm, 110μm, 120μm, 130μm, ..., 150μm, 160μm, ..., 190μm, 200μm, 210μm, 220μm, satisfying the range of 100μm to 220μm. When determining the thickness of the first optical adhesive layer 20 and the second optical adhesive layer 40, it can be ensured that the thickness of the first optical adhesive layer 20 is less than that of the second optical adhesive layer 40. This allows the display module to meet optical requirements while facilitating a thinner and lighter overall design. Of course, if the thickness requirement of the display module is not high, the thickness of the first optical adhesive layer 20 can also be equal to the thickness of the second optical adhesive layer 40, and can be selected within the above-mentioned corresponding thickness range, without specific limitations here.

[0066] like Figure 1 As shown, in this embodiment, the display module further includes a third optical adhesive layer 60, which is disposed on the side wall of the polarizer 30 and is located in the clearance space.

[0067] It should be noted that the space should be located in a clearing area, serving to block moisture and other foreign objects.

[0068] By setting a third optical adhesive layer 60 in the clearance space, external moisture is prevented from contacting the polarizer 30, further reducing the probability of polarizer 30 failure and thus improving the reliability of polarizer 30.

[0069] like Figure 1 As shown, in some embodiments, the third optical adhesive layer 60 is annular and surrounds the sidewall surface of the polarizer 30.

[0070] The aforementioned annular structure refers to the overall annular structure of the third optical adhesive layer 60. This third optical adhesive layer 60 can be a single, integral annular structure, or it can be composed of one or more strip-shaped structures joined together to form an annular structure; no specific limitation is made here. Specifically, the specific structure of the third optical adhesive layer 60 is determined according to the structure of the polarizer 30. For example, when the polarizer 30 is square, the third optical adhesive layer 60 is square annular; when the polarizer 30 is circular, the third optical adhesive layer 60 is circular annular. In this case, the sidewall surface of the polarizer 30 is the outer annular surface.

[0071] With the above configuration, the entire sidewall of the polarizer 30 is provided with a third optical adhesive layer 60. This prevents moisture from entering the display module from all directions and coming into contact with the polarizer 30, further reducing the probability of polarizer 30 failure and thus improving the reliability of the polarizer 30.

[0072] Of course, in other embodiments, the third optical adhesive layer 60 may be ring-shaped or may be provided only on at least one side of the polarizer 30 or in areas where moisture or other substances can easily enter; no specific limitation is made here.

[0073] The material of the third optical adhesive layer 60 can be the same as that of the first optical adhesive layer 20 and the second optical adhesive layer 40. In this way, only one material or product of optical adhesive layer needs to be prepared during the display module manufacturing process, which simplifies the display module manufacturing process and reduces costs.

[0074] like Figure 1 As shown, in some embodiments, the thickness of the third optical adhesive layer 60 is equal to the thickness of the polarizer 30.

[0075] The above configuration not only facilitates the connection between the third optical adhesive layer 60 and the polarizer 30, the first optical adhesive layer 20, and the second optical adhesive layer 40, making the display module connection firm, but also reduces the probability of gaps forming between the third optical adhesive layer 60 and the second optical adhesive layer 40, and between the third optical adhesive layer 60 and the first optical adhesive layer 20. Thus, by covering the polarizer 30 with the first optical adhesive layer 20, the third optical adhesive layer 60, and the third optical adhesive layer 60, moisture can be blocked as much as possible or even completely, improving the protection level and sealing performance of the polarizer 30, thereby improving the sealing level and waterproof level of the display module.

[0076] It should be noted that the width of the third optical adhesive layer 60 can also be greater than the thickness of the polarizer 30. The width of the third optical adhesive layer 60 refers to the dimension of the third optical adhesive layer 60 in the thickness direction of the display panel 10.

[0077] Specifically, the first optical adhesive layer 20 includes a first outer side surface, the second optical adhesive layer 40 includes a second outer side surface, and the third optical adhesive layer 60 has a third outer side surface away from the sidewall surface.

[0078] When the first outer surface of the first optical adhesive layer 20 and the second outer surface of the second optical adhesive layer 40 are not flush, the thickness of the third optical adhesive layer 60 can be equal to the sum of the thicknesses of the polarizer 30 and the first optical adhesive layer 20, or the thickness of the third optical adhesive layer 60 can be different from the sum of the thicknesses of the polarizer 30 and the second optical adhesive layer 40, as long as the third outer surface is flush with the first outer surface and the third outer surface is flush with the second outer surface. In other words, as long as the clearance space between the first optical adhesive layer 20 and the second optical adhesive layer 40 is filled, no specific limitation is made here.

[0079] Through multiple tests, it was found that the thickness of the third optical adhesive layer 60 in this embodiment can be 0.1mm, 0.2mm, 0.3mm, or 0.4mm, satisfying the range of 0.1mm to 0.4mm. The thickness of the third optical adhesive layer 60 refers to its dimension in the direction perpendicular to the thickness direction of the display panel 10. For example, when the third optical adhesive layer 60 is annular, its thickness is its radial dimension.

[0080] Of course, the material of the third optical adhesive layer 60 may also be different from that of the first optical adhesive layer 20 and the second optical adhesive layer 40, and no specific limitation is made here.

[0081] In other embodiments, the shape of the orthographic projection of the first optical adhesive layer 20 on the display panel 10 is the same as the shape of the orthographic projection of the second optical adhesive layer 40 on the display panel 10, but the areas of the orthographic projections are different. This includes situations where the orthographic projection area of ​​the first optical adhesive layer 20 on the display panel 10 is larger than the orthographic projection area of ​​the second optical adhesive layer 40 on the display panel 10, and the orthographic projection area of ​​the second optical adhesive layer 40 on the display panel 10 is greater than or equal to the orthographic projection area of ​​the polarizer 30 on the display panel 10. Furthermore, the second optical adhesive layer 40 on the display panel 10... The orthogonal projection area on the display panel 10 is greater than the orthogonal projection area of ​​the first optical adhesive layer 20 on the display panel 10. The orthogonal projection area of ​​the first optical adhesive layer 20 on the display panel 10 is greater than or equal to the orthogonal projection area of ​​the polarizer 30 on the display panel 10. That is to say, the polarizer 30 is at least smaller than the second optical adhesive layer 40 or the first optical adhesive layer 20. In this way, a clearance space can be formed between the side wall of the polarizer 30 and the second optical adhesive layer 40, or a clearance space can be formed between the side wall of the polarizer 30 and the first optical adhesive layer 20. This is not specifically limited.

[0082] like Figure 2 and Figure 3 As shown, in this embodiment, the light-receiving surface of the display panel 10 is provided with a carrier layer 70 and a functional layer 80. The orthographic projection of the functional layer 80 onto the display panel 10 is located within the orthographic projection of the carrier layer 70 onto the display panel 10.

[0083] The carrier layer 70 serves to support the display panel 10. Specifically, the carrier layer 70 is disposed on one side surface of the light-emitting side of the display panel 10, that is, on the light-incoming surface of the display panel 10.

[0084] This facilitates the assembly and positioning of the display panel 10 during assembly, thereby improving the processing accuracy of the display module.

[0085] When the aforementioned carrier layer 70 and functional layer 80 are formed on the light-receiving surface of the display panel 10, the orthographic projections of the carrier layer 70 and functional layer 80 have a certain positional relationship with the third optical adhesive layer 60. Specifically, the orthographic projection of the third optical adhesive layer 60 on the display panel 10 is located within the orthographic projection of the carrier layer 70 on the display panel 10, and the orthographic projection of the third optical adhesive layer 60 on the display panel 10 is located outside the orthographic projection of the functional layer 80 on the display panel 10. This helps to improve the reliability of the display module.

[0086] It should be noted that when the display panel 10 includes a substrate 11, the carrier layer 70 can be omitted. This eliminates either the substrate 11 or the carrier layer 70 in the display panel 10, reducing the number of manufacturing steps in the display module and facilitating a reduction in the overall thickness of the display module, thus contributing to its thinner and lighter design. Alternatively, the carrier layer 70 and the substrate 11 can be separate components. Accordingly, the thickness of either the substrate 11 or the carrier layer 70 can be reduced, and then the two components can be joined into a single structure; no specific limitations are imposed here.

[0087] In the design and experimentation of display modules, it is usually necessary to enable the display module to have functions such as bonding or grounding. The aforementioned functional layer 80 can be directly disposed on the light-incoming surface of the display panel 10, or it can be disposed on the surface of the carrier layer 70 away from the display panel 10. In this case, the carrier layer 70 is located between the display panel 10 and the functional layer 80.

[0088] The aforementioned functional layer 80 can be any one or more of a grounding layer, an electron blocking layer, and an optical compensation layer, so that the display module as a whole has functions such as grounding and bonding.

[0089] Specifically, such as Figure 3 As shown, in this embodiment, a functional layer 80 is provided on the side surface of the carrier layer 70 facing away from the display panel 10. The functional layer 80 can be a composite tape.

[0090] In OLED display modules, composite tape, also known as multifunctional tape, is a key functional material. Its main functions include at least one or more of the following: bonding of multi-layer structures, sealing, cushioning, dust and moisture protection, heat dissipation, and optical coupling.

[0091] The aforementioned composite tape can be a double-sided tape. It is formed from a PET substrate and pressure-sensitive adhesive, serving to fix and bond flexible printed circuit boards (FPCBs / FPCs) and module frames. An FPC is a patterned printed circuit board made from a flexible substrate, consisting of an insulating substrate and a conductive layer, with an adhesive potentially between the two.

[0092] The aforementioned composite tape can be a thermally conductive tape. The composite tape is formed using ceramic / graphene fillers and serves to bond heat dissipation films or metal backplates.

[0093] The aforementioned composite tape can be an electromagnetic interference (EMI) shielding tape. The composite tape is formed by conductive fibers or metal coating, and plays the role of edge sealing and shielding against electromagnetic interference.

[0094] When the OLED display module is used in a rigid screen, the composite tape needs to be bonded to the glass cover 50 and the display layer using OCA tape, requiring high light transmittance and resistance to yellowing.

[0095] When this OLED display module is used in a flexible screen, flexible OCR adhesive or ultra-thin pressure-sensitive adhesive (such as the 3M 817x series) is required to withstand bending (>100,000 cycles).

[0096] When this OLED display module is used in a foldable screen, the composite tape must have an extremely low modulus (such as polyurethane-based) to prevent delamination at the crease.

[0097] To solve the above problems, such as Figure 4 As shown in the embodiments of this application, a method for manufacturing a display module is also provided, the method comprising:

[0098] Step S100: A first optical adhesive layer 20 is formed on the light-emitting surface of the display panel 10.

[0099] This step prepares for the subsequent setup of polarizer 30.

[0100] After step S100, step S200 is also included: forming a polarizer 30 on the side surface of the first optical adhesive layer 20 that is away from the light-emitting surface of the display panel 10.

[0101] During step S200, the polarizer 30 must not protrude from the first optical adhesive layer 20; that is, the polarizer 30 can only be formed inside the first optical adhesive layer 20. This allows for clearance when the third optical adhesive layer 60 is subsequently installed. This reduces the risk of the polarizer 30 failing during reliability testing.

[0102] After step S200, step S300 is also included: forming a second optical adhesive layer 40 on the side surface of the polarizer 30 facing away from the first optical adhesive layer 20.

[0103] During step S300, the second optical adhesive layer 40 needs to completely cover the polarizer 30. This creates a clearance space between the sidewall of the polarizer 30, the first optical adhesive layer 20, and the second optical adhesive layer 40, thus protecting the polarizer 30.

[0104] After step S300, step S400 is further included: forming a cover plate 50 on the side surface of the second optical adhesive layer 40 opposite to the polarizer 30 to form a display module.

[0105] When performing the above step S400, the cover plate 50 needs to be covered with the second optical adhesive layer 40, so that the polarizer 30 can be firmly connected to the cover plate 50 through the second optical adhesive layer 40.

[0106] With the above settings, the cover plate 50 serves to protect the polarizer 30.

[0107] The structure of the display module obtained through steps S100 to S400 is the same as that of the display module in the above embodiment. The display module obtained by this preparation method has a first optical adhesive layer 20 disposed between the light-emitting surface of the display panel 10 and the polarizer 30, while a second optical adhesive layer 40 is disposed on the side of the polarizer 30 facing away from the first optical adhesive layer 20. In other words, one side of the polarizer 30 on the display panel 10 is bonded to the light-emitting surface of the display panel 10 through the first optical adhesive layer 20, and the other side of the polarizer 30 is bonded to the cover plate 50 through the second optical adhesive layer 40. Thus, not only is the polarizer 30 bonded to the light-emitting surface of the display panel 10, but the other side of the polarizer 30 is also bonded to the cover plate 50. The panel 10 and the cover plate 50 are firmly connected. Moreover, during reliability testing of the display panel 10, the first optical adhesive layer 20 and the second optical adhesive layer 40 can deform, so that the polarizer 30 on both sides of the display panel 10 is protected by the first optical adhesive layer 20 and the second optical adhesive layer 40 at the same time, reducing the probability of polarizer 30 deformation failure. At the same time, this display module avoids the side wall surface of the polarizer 30 being directly exposed to the external environment, which can block moisture. During reliability testing such as sweat testing, it avoids the side wall surface of the polarizer 30 coming into contact with sweat and causing fading failure, thereby improving the display effect and reliability of the display module.

[0108] like Figure 5 As shown, before step S100, the method further includes step S010: providing the display panel 10.

[0109] It should be noted that providing the display panel 10 here refers to providing a finished or semi-finished display panel 10. This simplifies the manufacturing process of the display module, thereby accelerating the manufacturing efficiency of the display panel assembly.

[0110] Of course, the display panel 10 can also be a semi-finished or finished product that is directly prepared on-site, so that it can be made before the display module preparation process, without any specific limitation here.

[0111] like Figure 5 As shown, in some embodiments, after step S200 and before step S300, the method further includes step S210: forming a third optical adhesive layer 60 on the surface of the polarizer 30 facing away from the first optical adhesive layer 20, the third optical adhesive layer 60 covering the first optical adhesive layer 20. In this embodiment, the third optical adhesive layer 60 is annular, surrounding the polarizer 30, thus effectively protecting the polarizer 30. Specifically, during step S300, the second optical adhesive layer 40 covers both the polarizer 30 and the third optical adhesive layer 60.

[0112] In this way, the polarizer 30 can be completely enclosed, further reducing the risk of polarizer 30 failure during reliability testing of the limiting module, thereby further improving the reliability of the display module.

[0113] The structure of the display module prepared by this method is the same as that of the display module in the above embodiment, and will not be described again here.

[0114] To address the aforementioned issues, this application also provides a display device (not shown in the figures), including a display module and an outer frame (not shown in the figures), with the display module disposed inside the outer frame.

[0115] In this embodiment, as Figure 3 As shown, the display module includes a functional layer 80, a carrier layer 70, a display panel 10, a first optical adhesive layer 20, a polarizer 30, a second optical adhesive layer 40, and a cover plate 50, which are stacked sequentially from bottom to top. The outer frame is bonded to the display panel 10 and the carrier layer 70 through the functional layer 80.

[0116] The display device of this application comprises a first optical adhesive layer 20 disposed between the light-emitting surface of the display panel 10 and the polarizer 30, and a second optical adhesive layer 40 disposed on the side of the polarizer 30 facing away from the first optical adhesive layer 20. In other words, one side of the polarizer 30 in the thickness direction of the display panel 10 is bonded to the light-emitting surface of the display panel 10 via the first optical adhesive layer 20, and the other side of the polarizer 30 is bonded to the cover plate 50 via the second optical adhesive layer 40. This not only ensures a firm connection between the polarizer 30 and the display panel 10 and the cover plate 50, but also allows the first and second optical adhesive layers 20 and 40 to deform during reliability testing of the display panel 10, enabling the polarizer 30 to... Both sides of the display panel 10 in the thickness direction are protected by the first optical adhesive layer 20 and the second optical adhesive layer 40, reducing the probability of polarizer 30 deformation and failure. At the same time, the above arrangement avoids the side wall of polarizer 30 from being directly exposed to the external environment, which can block moisture. During reliability tests such as sweat tests, the side wall of polarizer 30 is prevented from coming into contact with sweat and causing fading failure. This helps to improve the display effect and reliability of the display module. When the display module is installed in the housing to form a display device, the outer frame is bonded to the display panel 10 and the carrier layer 70 through the functional layer 80. In this way, the outer frame is firmly connected to the display module, improving the overall display effect and reliability of the display device.

[0117] The structure of the above-described display module is the same as that of the display module in the above embodiment, and will not be described again here.

[0118] It should be noted that the display module can be sold as a standalone product, or it can be mounted on the casing to form a display device and sold as a whole.

[0119] When the display module is an OLED display module, the display device of this application is an OLED display device. This display device can be applied in fields such as electronic products, industrial applications, and medical applications. For example, the display device can be a smartphone, followed by laptops, displays, televisions, tablets, digital cameras, etc. It is also used in ships, aircraft instruments, video phones, vehicle displays, or medical devices with displays such as medical diagnostic images and surgical screen monitoring, without specific limitations.

[0120] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A display module, characterized in that, include: Display panel (10); A first optical adhesive layer (20) is disposed on the light-emitting surface of the display panel (10); Polarizing film (30), the polarizing film (30) is disposed on the side surface of the first optical adhesive layer (20) opposite to the light-emitting surface; A second optical adhesive layer (40) is disposed on the side surface of the polarizer (30) facing away from the first optical adhesive layer (20); Cover plate (50), the cover plate (50) is bonded to the side surface of the polarizer (30) opposite to the first optical adhesive layer (20) by the second optical adhesive layer (40); Wherein, the orthographic projection of the polarizer (30) on the display panel (10) is located within the orthographic projection of the first optical adhesive layer (20) on the display panel (10), and the orthographic projection of the polarizer (30) on the display panel (10) is located within the orthographic projection of the second optical adhesive layer (40) on the display panel (10).

2. The display module according to claim 1, characterized in that, The polarizer (30) includes a sidewall surface, the plane containing the sidewall surface intersects with the plane containing the light-emitting surface, wherein: The polarizer (30) has a smaller projected area on the display panel (10) than the first optical adhesive layer (20) on the display panel (10), and / or the polarizer (30) has a smaller projected area on the display panel (10) than the second optical adhesive layer (40) on the display panel (10), so that the sidewall surface is enclosed with at least one of the first optical adhesive layer (20) and the second optical adhesive layer (40) to form a clearance space.

3. The display module according to claim 2, characterized in that, The polarizer (30) includes a sidewall surface, the plane containing the sidewall surface intersects with the plane containing the light-emitting surface, wherein: The orthographic projection area of ​​the polarizer (30) on the display panel (10) is smaller than the orthographic projection area of ​​the first optical adhesive layer (20) on the display panel (10), and the orthographic projection area of ​​the polarizer (30) on the display panel (10) is smaller than the orthographic projection area of ​​the second optical adhesive layer (40) on the display panel (10). The orthographic projection of the first optical adhesive layer (20) on the display panel (10) and the orthographic projection of the second optical adhesive layer (40) on the display panel (10) completely overlap, so that the side wall surface and the first optical adhesive layer (20) and the second optical adhesive layer (40) enclose the clearance space.

4. The display module according to claim 2 or 3, characterized in that, The display module further includes a third optical adhesive layer (60), which is disposed on the side wall surface and is located at least in the clearance space.

5. The display module according to claim 4, characterized in that, The third optical adhesive layer (60) is annular and surrounds the sidewall surface; Preferably, the first optical adhesive layer (20) includes a first outer surface, the second optical adhesive layer (40) includes a second outer surface, and the third optical adhesive layer (60) includes a third outer surface away from the sidewall surface. Any one of the plane containing the first outer surface, the plane containing the second outer surface, and the plane containing the third outer surface intersects the plane containing the light-emitting surface, wherein the third outer surface is flush with the first outer surface and the third outer surface is flush with the second outer surface.

6. The display module according to claim 4, characterized in that, The width of the third optical adhesive layer (60) is equal to the thickness of the polarizer (30), and the width of the third optical adhesive layer (60) is the dimension of the third optical adhesive layer (60) in the thickness direction of the display panel (10). Preferably, the thickness of the third optical adhesive layer (60) is 0.1 mm to 0.4 mm, and the thickness of the third optical adhesive layer (60) is the dimension of the third optical adhesive layer (60) in the direction perpendicular to the thickness direction of the display panel (10).

7. The display module according to claim 5 or 6, characterized in that, The display panel (10) includes a substrate (11), and the orthographic projection of the first optical adhesive layer (20) on the substrate (11) is located within the orthographic projection of the light-emitting surface on the substrate (11); Preferably, the orthographic projection of the third optical adhesive layer (60) on the substrate (11) is located within the substrate (11); Preferably, the light-receiving surface of the display panel (10) is provided with a carrier layer (70) and a functional layer (80), the carrier layer (70) is located between the display panel (10) and the functional layer (80), and the orthographic projection of the functional layer (80) on the display panel (10) is located within the orthographic projection of the carrier layer (70) on the display panel (10); Preferably, the third optical adhesive layer (60) is located within the orthographic projection of the carrier layer (70) on the display panel (10), and the third optical adhesive layer (60) is located outside the orthographic projection of the functional layer (80) on the display panel (10).

8. The display module according to claim 5 or 6, characterized in that, The thickness of the first optical adhesive layer (20) is less than or equal to the thickness of the second optical adhesive layer (40); Preferably, the thickness of the first optical adhesive layer (20) is 50 μm to 150 μm; Preferably, the thickness of the second optical adhesive layer (40) is 100μm to 220μm.

9. A method for manufacturing a display module, used to manufacture the display module as described in any one of claims 1 to 8, characterized in that, The preparation method includes: A first optical adhesive layer is formed on the light-emitting surface of the display panel; A polarizer is formed on the surface of the first optical adhesive layer that is opposite to the light-emitting surface; A second optical adhesive layer is formed on the surface of the polarizer that is opposite to the first optical adhesive layer; A cover plate is formed on the surface of the second optical adhesive layer facing away from the polarizer to form the display module.

10. A display device, characterized in that, The display module and the outer frame are as described in any one of claims 1-8. The display module is disposed inside the outer frame. The light-receiving surface of the display panel (10) is provided with a carrier layer (70) and a functional layer (80). The carrier layer (70) is located between the display panel (10) and the functional layer (80). The outer frame is bonded to the display panel (10) and the carrier layer (70) through the functional layer (80).

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