WO2021169575A1

WO2021169575A1 - Flexible display device and method for preparing flexible display device

Info

Publication number: WO2021169575A1
Application number: PCT/CN2020/140828
Authority: WO
Inventors: 吴露; 史世明
Original assignee: 京东方科技集团股份有限公司
Priority date: 2020-02-27
Filing date: 2020-12-29
Publication date: 2021-09-02
Also published as: CN111312782A; CN111312782B

Abstract

Proposed are a flexible display device and a method for preparing the flexible display device. The flexible display device comprises: a substrate, and a plurality of light-emitting elements located on the substrate; a thin-film packaging structure that seals the light-emitting elements on the substrate; and a cover plate, wherein the cover plate is located on the side of the packaging structure away from the substrate, at least one of the cover plate and the thin-film packaging structure has a shear thickening reinforcement, and the shear thickening reinforcement is a fiber or capsule provided with a shear thickening liquid.

Description

Flexible display device, and method of manufacturing flexible display device

Technical field

The present disclosure relates to the field of display technology, in particular, to a flexible display device, and a method of manufacturing the flexible display device.

Background technique

Organic electroluminescence (OLED) display devices have attracted wide attention because of their self-luminescence, wide viewing angle, high contrast, and flexible display, such as folding and curling of the screen. Since organic light-emitting elements contain materials that are sensitive to water and oxygen, they need to be packaged to seal and isolate the water and oxygen in the environment. Current organic display devices mostly adopt thin-film packaging structures to achieve packaging. Thin-film packaging structures are mostly multi-layered inorganic and organic layers to achieve packaging. For flexible display devices, especially folding display modules, not only is the film packaging structure required to have a good packaging effect, but the display module as a whole is also required to have good flexibility (such as bending, curling, etc.) and impact resistance. performance.

However, current flexible display devices and methods for preparing flexible display devices still need to be improved.

Application content

The present disclosure aims to alleviate or solve at least one of the above-mentioned problems to at least a certain extent.

In one aspect of the present disclosure, the present disclosure proposes a flexible display device. The flexible display device includes: a substrate, and a plurality of light-emitting elements located on the substrate; a thin-film packaging structure that seals the light-emitting elements on the substrate; a cover plate, the cover plate is located on the substrate The packaging structure is far away from the substrate, at least one of the cover plate and the film packaging structure has a shear thickening reinforcement, and the shear thickening reinforcement is a shear thickening liquid Fiber or capsule. As a result, the flexible display device has strong impact resistance, and thus has better durability and longevity.

According to an embodiment of the present disclosure, the material forming the shear thickening liquid includes at least one of silicon oxide, polystyrene, polymethyl methacrylate, polycalcium carbonate, and polypropylene. In this way, a shear thickening liquid can be easily obtained.

According to an embodiment of the present disclosure, the fiber includes at least one of Kevlar fiber and glass fiber, and the surface of the fiber is impregnated with the shear thickening liquid. Thus, the shear thickening reinforcement can be easily obtained, and the shear thickening reinforcement has better mechanical properties and transparency.

Disclosure According to an embodiment of the present disclosure, the thin film encapsulation structure includes an organic layer and at least one inorganic layer. The organic layer and the inorganic layer are alternately stacked and distributed, and the inorganic layer is in contact with the substrate. The cut thickening reinforcement is located at at least one of the following positions: inside the organic layer; inside the inorganic layer; the side of the inorganic layer away from the organic layer; and between the organic layer and the inorganic layer between. Thus, the performance of the flexible display device can be further improved.

According to an embodiment of the present disclosure, the flexible display device has a rigid area and a flexible area, the flexible display device can be bent from the flexible area, and the fibers located in the rigid area and the flexible area The following parameters of the fiber at the zone are not completely the same: the diameter of the fiber; the content of the shear thickening liquid wetted by the fiber surface; and the content of the fiber. As a result, the shear thickening characteristics of the rigid area and the flexible area can be different, which is beneficial to further improve the impact resistance and bending resistance of the flexible display device.

According to an embodiment of the present disclosure, the fiber located at the rigid zone and the fiber located at the flexible zone satisfy at least one of the following conditions: the diameter of the fiber at the rigid zone is greater than the diameter of the The diameter of the fiber at the flexible zone; the content of the shear thickening liquid wetted by the fiber surface at the rigid zone is greater than the shear thickening fluid wetted by the fiber surface at the flexible zone Liquid content; the content of the fiber in the rigid zone is greater than the content of the fiber in the flexible zone. Therefore, it is beneficial to further improve the impact resistance and bending resistance of the flexible display device.

According to an embodiment of the present disclosure, the capsule includes a shell and the shear thickening liquid located inside the shell, and the material forming the shell includes at least one of an inorganic oxide and a polymer. As a result, the shear thickening reinforcement can be made to have a certain water resistance and oxygen resistance, so that the water resistance performance of the flexible display device can be further enhanced.

According to an embodiment of the present disclosure, the material forming the shell is an inorganic oxide, the inorganic oxide includes at least one of alumina, silica, and titania, and the shear thickening reinforcement is located at the Thin film packaging structure. As a result, the water-proof and oxygen-proof performance of the flexible display device can be further enhanced without affecting the display performance.

According to an embodiment of the present disclosure, the material forming the shell is a polymer, the polymer includes at least one of polypropylene and polyimide, and the shear thickening reinforcement is located at at least one of the following positions Place: inside the cover plate; the side of the cover plate away from the thin film packaging structure; and between the cover plate and the thin film packaging structure. Therefore, the impact resistance of the flexible display device can be further enhanced without affecting the display performance.

According to an embodiment of the present disclosure, the flexible display device further includes a polarizer, the polarizer is located between the substrate and the cover plate, and is adhered to a side of the cover plate facing the substrate through an adhesive layer. Side, the shear thickening reinforcement is located in at least one of the following positions: in the shear thickening film layer between the cover plate and the glue layer, and the shear thickening reinforcement is dispersed in In the shear thickening film layer; inside the glue layer; in the shear thickening film layer between the glue layer and the polarizer, and the shear thickening reinforcement is dispersed in the shear Cut into the thickened film layer; the cover plate is away from the inside of the hardened layer on the side of the polarizer. As a result, the performance of the flexible display device can be further improved.

In another aspect of the present disclosure, the present disclosure proposes a method of preparing the aforementioned flexible display device. The method includes: providing a substrate with a plurality of light-emitting elements; forming a thin film packaging structure on the substrate to seal the plurality of light-emitting elements on the substrate; providing a cover plate, the cover plate Located on the side of the thin film packaging structure formed on the substrate away from the substrate, and at least one of the cover plate and the thin film packaging structure is provided with a shear thickening reinforcement, the shear thickening The reinforcement is a fiber or capsule with a shear thickening liquid. Thus, the aforementioned flexible display device can be easily obtained.

According to an embodiment of the present disclosure, the flexible display device has a rigid area and a flexible area, the flexible display device can be bent from the flexible area, and the shear thickening enhancer has a shear thickening liquid The method includes: arranging the shear thickening reinforcement at the film packaging structure, and making the fiber located at the rigid zone and the fiber located at the flexible zone meet the following At least one of the conditions: the diameter of the fiber in the rigid zone is greater than the diameter of the fiber in the flexible zone; The content is greater than the content of the shear thickening liquid infiltrated by the fiber surface at the flexible zone; the content of the fiber at the rigid zone is greater than the content of the fiber at the flexible zone. As a result, the shear thickening performance of the flexible zone and the rigid zone can be different.

According to an embodiment of the present disclosure, forming a thin film encapsulation structure on a substrate includes forming an organic layer and at least one inorganic layer. The organic layer and the inorganic layer are alternately stacked and distributed, and the inorganic layer is in contact with the substrate. The shear thickening reinforcement is located at at least one of the following positions: inside the organic layer; inside the inorganic layer; the side of the inorganic layer away from the organic layer; and the organic layer and the inorganic layer Between layers. Therefore, the shear thickening reinforcement can be easily arranged at the film packaging structure.

Description of the drawings

The above and/or additional aspects and advantages of the present disclosure will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

Fig. 1 shows a schematic structural diagram of a flexible display device according to an embodiment of the present disclosure;

Figure 2 shows a schematic structural diagram of a capsule according to an embodiment of the present disclosure;

Fig. 3 shows a schematic structural diagram of a flexible display device according to an embodiment of the present disclosure;

FIG. 4 shows a schematic structural diagram of a flexible display device according to another embodiment of the present disclosure;

FIG. 5 shows a schematic structural diagram of a flexible display device according to another embodiment of the present disclosure;

FIG. 6 shows a schematic structural diagram of a flexible display device according to another embodiment of the present disclosure;

FIG. 7 shows a schematic structural diagram of a flexible display device according to another embodiment of the present disclosure;

FIG. 8 shows a schematic structural diagram of a flexible display device according to another embodiment of the present disclosure;

FIG. 9 shows a schematic structural diagram of a flexible display device according to another embodiment of the present disclosure;

FIG. 10 shows a schematic structural diagram of a flexible display device according to another embodiment of the present disclosure;

FIG. 11 shows a schematic structural diagram of a flexible display device according to another embodiment of the present disclosure;

FIG. 12 shows a schematic structural diagram of a flexible display device according to another embodiment of the present disclosure;

FIG. 13 shows a schematic structural diagram of a flexible display device according to another embodiment of the present disclosure; and

FIG. 14 shows a schematic flowchart of a method for preparing a flexible display device according to an embodiment of the present disclosure.

Description of reference signs:

100: substrate; 110: light-emitting element; 120: rigid area; 130: flexible area; 200: thin film packaging structure; 210: inorganic layer; 220: organic layer; 10: shear thickening reinforcement; 11: shell; 12 : Shear thickening liquid; 300: cover plate; 400: polarizer; 500: shear thickening film layer; 600: glue layer; 700: hardened layer; 1000: flexible display device.

Detailed ways

The embodiments of the present disclosure are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary, and are only used to explain the present disclosure, and cannot be understood as a limitation to the present disclosure.

In one aspect of the present disclosure, the present disclosure proposes a flexible display device. Referring to FIG. 1, the flexible display device 1000 includes a substrate 100 and a plurality of light-emitting elements 110 on the substrate 100. The thin film packaging structure 200 seals the light emitting element on the substrate. The cover plate 300 is located on a side of the packaging structure 200 away from the substrate 100, and at least one of the cover plate 300 and the thin film packaging structure 200 has a shear thickening reinforcement 10. The shear thickening reinforcement is a fiber or capsule with a shear thickening liquid. In the present disclosure, the specific types of the substrate 100 and the light-emitting element 110 are not particularly limited. Those skilled in the art can select familiar materials to form the substrate 100 and the light-emitting element 110 of the flexible display device according to actual needs. For example, the substrate 100 may be a flexible substrate, and the light-emitting element 110 may be an organic light-emitting diode. As a result, the flexible display device has strong impact resistance, and thus has better durability and longevity.

In other embodiments, a shear thickening reinforcement may be provided above the thin film packaging structure, that is, between the thin film packaging structure and the cover plate. Therefore, in the present disclosure, the “at least one” of the shear thickening reinforcement 10 provided in at least one of the cover plate 300 and the thin film packaging structure 200 includes being provided inside the cover plate 300 and/or the thin film packaging structure 200, and also It includes a surface provided on the cover plate 300 and/or the thin film packaging structure 200. That is, the shear thickening reinforcement 10 can be located inside the cover plate 300 or the thin film packaging structure 200, or both the thin film packaging structure 200 and the cover plate 300 have the shear thickening reinforcement 10. The shear thickening reinforcement 10 can also be located on the surface of the cover plate 300 or on the surface of the thin film packaging structure 200, or both the surface of the thin film packaging structure 200 and the cover plate 300 have the shear thickening reinforcement 10.

It should be particularly noted that the flexible display device may also have a structure including, but not limited to, a polarizer and the like between the film packaging structure 200 and the cover plate 300. In other embodiments, color films and black matrices can be used instead of polarizers to reduce reflectivity in flexible display devices. For simplicity of description, other structures such as polarizers are not shown in FIG. 1.

In order to facilitate understanding, the following briefly describes the principle that the flexible display device can achieve the above-mentioned beneficial effects:

The substrate of the flexible display module is generally formed of polymer materials such as PET, PC, and PI. Due to the thin film thickness and the characteristics of the polymer material itself, the impact resistance is usually poor. The shear thickening liquid contained in the shear thickening reinforcement 10 according to the embodiment of the present disclosure has a shear thickening effect, which is also called swelling property, which means that the system viscosity of the material increases with the shear rate or shear Non-Newtonian fluid behavior that increases with increasing stress. Shear thickening material refers to a material with shear thickening properties. When it is loaded by an instantaneous violent external force, the molecules of the material are locked with each other, and the hardness increases, thereby improving its ability to resist the instantaneous external force. And the above process is reversible, and the conversion time is extremely short, for example, it can reach the millisecond level. Therefore, the shear thickening enhancer 10 can have certain flexibility when the display screen is in normal use, and does not affect the normal use of the display screen. When the display screen is impacted by a sudden external force, the shear thickening liquid is firm. , Which can provide sufficient rigidity for the display screen, reduce the possibility of damage to the screen body due to excessive deformation, and improve the display effect of the display screen. In addition, arranging the above-mentioned shear thickening reinforcement on the cover plate or the thin-film packaging structure is also beneficial to simplify the preparation of the flexible display device, and since the light-emitting elements such as organic light-emitting diodes are sealed on the substrate 100 by the thin-film packaging structure Therefore, the added shear thickening reinforcement will not affect the display of light-emitting elements such as organic light-emitting diodes.

According to specific embodiments of the present disclosure, the material for forming the shear thickening liquid is not particularly limited, and those skilled in the art can select familiar materials according to actual needs to form a shear thickening liquid with a shear thickening effect. Specifically, the material forming the shear thickening liquid may include at least one of silicon oxide, polystyrene, polymethyl methacrylate, polycalcium carbonate, and polypropylene. In this way, a shear thickening liquid can be easily obtained.

According to the embodiments of the present disclosure, the specific shape of the shear thickening reinforcement is not particularly limited, for example, it may be fibrous or capsule-shaped. Compared with directly setting the shear thickening liquid, the fibers or capsules with the shear thickening liquid are beneficial to simplify the preparation process, for example, it can be conveniently arranged in positions between multiple layered structures of the film encapsulation structure. In addition, the fiber and the shell structure of the capsule can also improve the mechanical performance of the shear thickening reinforcement, and the function of the shear thickening reinforcement 10 can be increased by selecting the specific forming materials of the fiber and the capsule shell. For example, it has functions such as waterproof and oxygen.

Specifically, the aforementioned shear thickening reinforcement 10 may be a fiber whose surface is impregnated with a shear thickening liquid. For example, the fiber may be a transparent fiber with a certain degree of bendability, and it may specifically include at least one of Kevlar fiber and glass fiber. Thus, the shear thickening reinforcement can be easily obtained, and the shear thickening reinforcement has better mechanical properties and transparency. According to other embodiments of the present disclosure, referring to FIG. 2, the aforementioned shear thickening reinforcement 10 may also be a capsule containing a shear thickening liquid 12 inside. The material forming the shell 11 of the capsule may include at least one of an inorganic oxide and a polymer. Specifically, the casing 11 made of inorganic oxide can make the shear thickening reinforcement member have a certain water resistance to oxygen, thereby further enhancing the water resistance of the flexible display device. The shell 11 formed by polymer can make the shear thickening reinforcement 10 have better transparency, so that it can be added at the cover plate.

According to an embodiment of the present disclosure, referring to FIGS. 3-6, the thin film encapsulation structure may include an organic layer 220 and at least one inorganic layer 210 (210A and 210B as shown in the figure), the organic layer and the inorganic layer are alternately stacked and distributed, and The inorganic layer is in contact with the substrate 100. For simplicity of description, the light-emitting element 110 is not shown in the figure. The shear thickening reinforcement 10 may be located inside the organic layer 220, inside the inorganic layer, on the side of the inorganic layer away from the organic layer, or between the organic layer and the inorganic layer. Alternatively, according to other embodiments of the present disclosure, the shear thickening reinforcement 10 may also be located at at least one of the above-mentioned positions. As a result, the performance of the flexible display device can be further improved. At this time, the specific form of the shear thickening reinforcement is not particularly limited, and it may be fibrous or capsule. The figure only shows the case where the shear thickening reinforcement 10 is fibrous, but it cannot be understood as a restriction on the shape of the shear thickening reinforcement 10. In particular, when the shear thickening reinforcement 10 is in the shape of a capsule, and the shell of the capsule is composed of an inorganic oxide capable of waterproofing oxygen, it can be further provided that the shear thickening reinforcement 10 is arranged at the film encapsulation structure. Enhance the waterproof and oxygen ability of the film packaging structure. For example, specifically, referring to FIG. 3, the thin-film encapsulation structure may include a first inorganic layer 210A, an organic layer 220 and a second inorganic layer 210B, wherein the first inorganic layer 210A is disposed close to the side of the substrate 100. The shear thickening reinforcement 10 may be located inside the second inorganic layer 210B, that is, the shear thickening reinforcement 10 is provided when the second inorganic layer 210B is formed. As a result, the shear thickening reinforcement 10 can be closer to the side of the flexible display device that is impacted by an external force during use. Alternatively, referring to FIG. 4, the shear thickening reinforcement 10 may also be located inside the first inorganic layer 210A. Similarly, referring to FIG. 5, the shear thickening reinforcement 10 may also be located inside the organic layer 220, that is, when the organic layer 220 is formed, the shear thickening reinforcement 10 is disposed inside the organic layer 220 and used to form the organic layer 220. The material covers the shear thickening reinforcement 10. When the shear thickening reinforcement 10 is located inside the organic layer or the inorganic layer, it is only necessary to disperse the shear thickening reinforcement 10 on the material forming the organic layer or the inorganic layer. Alternatively, referring to FIGS. 6 and 7, the shear thickening reinforcement 10 may also be located between the inorganic layer and the organic layer, or located on the side of the second inorganic layer 210B away from the substrate 100. At this time, the shear thickening reinforcement 10 may be a single layered structure. For example, after finishing the inorganic layer or organic layer, the shear thickening reinforcement 10 can be dispersed on the prepared inorganic layer or organic layer.

According to an embodiment of the present disclosure, referring to FIG. 7, the flexible display device may have a rigid area 120 and a flexible area 130, and the flexible display device may bend from the flexible area 130. The shear thickening reinforcement 10 located in the flexible zone and the shear thickening reinforcement 10 located in the rigid zone may not be completely the same, for example, the content of the shear thickening reinforcement 10 is different, and the size or size of the shear thickening reinforcement 10 is different. Or the size is different. As mentioned above, the shear thickening reinforcement 10 can play a role in alleviating the impact when it is impacted by an external force. Therefore, appropriately increasing the shear thickening effect of the shear thickening reinforcement 10 at the rigid zone 120 is beneficial to improve The impact resistance and bending resistance of the flexible display device. Taking the shear thickening reinforcement 10 located in the rigid zone as an example of fiber, the following parameters of the fiber in the flexible zone and in the rigid zone may not be exactly the same: the diameter of the fiber, the shear thickening of the fiber surface infiltration Liquid content and fiber content. As a result, the shear thickening characteristics of the rigid area and the flexible area can be different, which is beneficial to further improve the impact resistance and bending resistance of the flexible display device.

According to the embodiments of the present disclosure, specifically, the fibers located in the rigid zone and the fibers located in the flexible zone can meet at least one of the following conditions: the diameter of the fiber in the rigid zone is greater than the diameter of the fiber in the flexible zone; the rigid zone The content of the shear thickening fluid infiltrated on the fiber surface is greater than the content of the shear thickening fluid infiltrated on the fiber surface at the flexible zone; the content of the fiber in the rigid zone is greater than the content of the fiber in the flexible zone. Therefore, it is beneficial to further improve the impact resistance and bending resistance of the flexible display device.

According to other embodiments of the present disclosure, the material forming the housing may also be a polymer, for example, the polymer includes at least one of polypropylene and polyimide. 8-13, at this time, the shear thickening reinforcement 10 can be located at at least one of the following positions: inside the cover plate; the side of the cover plate away from the thin film packaging structure and between the cover plate and the thin film packaging structure. Therefore, the impact resistance of the flexible display device can be further enhanced without affecting the display performance. According to a specific embodiment of the present disclosure, the shell of the capsule may be formed of polypropylene. Polypropylene shell capsules have higher light transmittance, and can improve the toughness of polypropylene (the capsule is filled with shear thickening liquid) while maintaining the original rigidity of polypropylene, and improve the resistance of polypropylene Heat and processing fluidity, and the shear thickener in the form of a capsule can be solidified into a solid powder phase during the preparation process, so it is more convenient for molding and processing than liquid.

According to an embodiment of the present disclosure, the flexible display device further includes a polarizer 400, which is located between the substrate 100 and the cover plate 300, and is pasted on the side of the cover plate 300 facing the substrate through an adhesive layer 600. A hardened layer 700 may also be provided on the side of the cover plate 300 away from the substrate 100. The shear thickening reinforcement 10 can be dispersed in the adhesive layer 600, the cover plate 300 or the hardened layer 700, or the shear thickening reinforcement 10 can also be dispersed in the shear thickening film layer 500. The cut thickening film layer 500 may be composed of a polymer material. The shear thickening film layer 500 may be located between the hardened layer 700 and the cover plate 300, between the cover plate 300 and the glue layer 600, or between the polarizer 400 and the glue layer 600. It should be specifically noted here that when the shear thickening reinforcement 10 is located at the cover 300 (the position shown in Figures 8-13), in order not to affect the display of the flexible display device, the shearing at this time is required The cut thickening reinforcement 10 must have a certain degree of light transmittance. For example, when the shear thickening reinforcement 10 is a capsule and the shell is made of inorganic oxide, the transparency of the shear thickening reinforcement 10 is slightly lower, and then it is preferable to arrange the shear thickening reinforcement 10 in a film package at this time. Structure Department. When the shear thickening reinforcement 10 is a capsule and the shell is formed of polymer, especially polypropylene with better transparency, the shear thickening reinforcement 10 can be arranged at the cover 300.

In another aspect of the present disclosure, the present disclosure proposes a method of preparing the foregoing flexible display device. Referring to Figure 14, the method includes:

S100: Provide a substrate with a plurality of light-emitting elements on the substrate

According to an embodiment of the present disclosure, in this step, a substrate is first provided, and a plurality of light-emitting elements are provided on the substrate to realize a display function. For example, the plurality of light-emitting elements may be a plurality of organic light-emitting diodes, or quantum dot light-emitting diodes. Regarding the specific structure of the substrate, a detailed description has been made above, and will not be repeated here.

S200: forming a thin film packaging structure on a substrate to seal a plurality of light-emitting elements on the substrate;

According to an embodiment of the present disclosure, a thin film packaging structure is formed in this step. The specific structure of the film packaging structure has been described in detail above, and will not be repeated here. It should be particularly noted that when the shear thickening reinforcement formed in the subsequent steps is located at or inside the thin film packaging structure, the step of forming the thin film packaging structure should also include the operation of setting the shear thickening reinforcement .

S300: A shear thickening reinforcement is provided at at least one of the cover plate and the film packaging structure;

According to an embodiment of the present disclosure, in this step, a shear thickening reinforcement is provided at at least one of the cover plate and the film packaging structure. For example, specifically, the shear thickening reinforcement member may be located at the thin film packaging structure, specifically at least one of the following positions: inside the organic layer; inside the inorganic layer; the side of the inorganic layer away from the organic layer; and the organic layer And the inorganic layer. The shear thickening reinforcement can also be located at the cover plate, for example, it can be located on the side of the cover plate away from the film encapsulation structure, or between the cover plate and the film encapsulation structure, can also be located inside the cover plate, or located on the cover plate away from the film Inside the hardened layer on one side of the package structure, etc. The specific location of the shear thickening reinforcement has been described in detail above, and will not be repeated here.

As mentioned above, the shear thickening reinforcement is a fiber or capsule with a shear thickening liquid. Thus, the aforementioned flexible display device can be easily obtained.

The specific morphology, specific placement position, material composition and the principle of realizing impact resistance of the shear thickening reinforcement have been described in detail above, and will not be repeated here.

According to a specific embodiment of the present disclosure, the shear thickening reinforcement may be a capsule with a shear thickening liquid. The specific method for forming the capsule is not particularly limited, and those skilled in the art can choose a familiar method for forming the capsule according to the specific circumstances such as the material of the capsule shell and the composition of the internal shear thickening liquid. For example, the capsule may be obtained by using at least one of the following methods: sol-gel method, interfacial polymerization method, emulsion polymerization method, hydrothermal method, recrystallization method, supercritical fluid drying method, self-assembly method, template polymerization method , Heterogeneous nucleation method, dispersion copolymerization method, mechanical mixing method, seed polymerization method, soap-free polymerization method and chemical co-precipitation method. In this way, a capsule with a shear thickening liquid can be easily obtained.

Similarly, when the shear thickening reinforcement is a fiber, a specific fiber (such as the Kevlar fiber and glass fiber mentioned above) can be selected, including but not limited to immersing the fiber in a shear thickening liquid The operation of obtaining a shear thickening reinforcement with a shear thickening liquid immersed on the surface.

After the shear thickening part is obtained, the specific method of setting it at the cover plate or the film packaging structure is not particularly limited. Those skilled in the art can make a selection according to the actual situation, for example, by including but not limited to spraying, The shear thickening member is arranged at the cover plate or the film packaging structure by means of coating, knife coating, etc. Alternatively, the shear thickening member can also be dispersed in the polymer solution to form a shear thickening film layer containing the shear thickening member.

According to an embodiment of the present disclosure, the flexible display device prepared by the method may have a rigid area and a flexible area, and the flexible display device may bend from the flexible area. The shear thickening effect of the shear thickening reinforcement in the flexible zone and the rigid zone can also be different. Specifically, when the shear thickening element is a fiber with a shear thickening liquid, a shear can be provided at the film packaging structure. Cut the thickening reinforcement, and make the shear thickening effect of the shear thickening reinforcement in the flexible zone weaker than the shear thickening effect of the shear thickening reinforcement in the rigid zone. For example, it can be specifically controlled that the diameter of the fiber in the rigid zone is greater than the diameter of the fiber in the flexible zone, or the content of the fiber surface infiltration shear thickening liquid in the rigid zone is greater than the shear thickening of the fiber surface infiltration in the flexible zone The content of the liquid. Or make the content of fibers in the rigid area greater than the content of fibers in the flexible area. Specifically, methods including but not limited to patterning techniques can be used. Under the premise that the fiber diameter is the same and the content of the shear thickening solution impregnated on the fiber surface is also the same, the content of the fiber in the rigid area is greater than that of the fiber in the flexible area. content. As a result, the shear thickening performance of the flexible zone and the rigid zone can be different. Therefore, the impact resistance of the flexible display device can be further improved.

In the description of this specification, the description with reference to the terms "one embodiment", "another embodiment", etc. means that the specific feature, structure, material or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present disclosure . In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples and the features of the different embodiments or examples described in this specification without contradicting each other.

Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present disclosure. Those of ordinary skill in the art can comment on the foregoing within the scope of the present disclosure. The embodiment undergoes changes, modifications, substitutions, and modifications.

Claims

A flexible display device includes:

A substrate, and a plurality of light-emitting elements located on the substrate;

A thin-film packaging structure that seals the light-emitting element on the substrate;

A cover plate located on the side of the packaging structure away from the substrate,

At least one of the cover plate and the film packaging structure is provided with a shear thickening reinforcement, and the shear thickening reinforcement is a fiber or a capsule with a shear thickening liquid.
The flexible display device according to claim 1, wherein the material forming the shear thickening liquid includes at least one of silicon oxide, polystyrene, polymethyl methacrylate, polycalcium carbonate, and polypropylene.
The flexible display device according to claim 1 or 2, wherein the fiber includes at least one of Kevlar fiber and glass fiber, and the surface of the fiber is impregnated with the shear thickening liquid.
The flexible display device according to any one of claims 1 to 3, the thin film encapsulation structure comprises an organic layer and at least one inorganic layer, the organic layer and the inorganic layer are alternately stacked and distributed, and the inorganic layer and the inorganic layer are alternately stacked and distributed. When the substrates are in contact with each other, the shear thickening reinforcement is located at at least one of the following positions:

Inside the organic layer;

Inside the inorganic layer;

The side of the inorganic layer away from the organic layer; and

Between the organic layer and the inorganic layer.
The flexible display device according to any one of claims 1 to 4, wherein the flexible display device has a rigid area and a flexible area, and the flexible display device can be bent from the flexible area and is located at the The following parameters of the fiber at the rigid zone and the fiber at the flexible zone are not exactly the same:

The diameter of the fiber;

The content of the shear thickening liquid infiltrated by the fiber surface; and

The content of the fiber.
The flexible display device according to claim 5, wherein the fiber located at the rigid area and the fiber located at the flexible area satisfy at least one of the following conditions:

The diameter of the fiber at the rigid zone is greater than the diameter of the fiber at the flexible zone;

The content of the shear thickening liquid infiltrated by the fiber surface in the rigid zone is greater than the content of the shear thickening liquid infiltrated on the fiber surface in the flexible zone;

The content of the fiber in the rigid zone is greater than the content of the fiber in the flexible zone.
The flexible display device according to claim 1, wherein the capsule comprises a shell and the shear thickening liquid located inside the shell, and the material forming the shell includes at least inorganic oxides and polymers. one.
The flexible display device according to claim 7, wherein the material forming the housing is an inorganic oxide, and the inorganic oxide includes at least one of alumina, silica, and titanium oxide, and the shear The cut thickening reinforcement is located in the thin film packaging structure.
The flexible display device according to claim 7, wherein the material forming the housing is a polymer, the polymer includes at least one of polypropylene and polyimide, and the shear thickening reinforcement is located in the following position At least one of:

Inside the cover;

The side of the cover plate away from the film packaging structure; and

Between the cover plate and the film packaging structure.
The flexible display device according to claim 9, the flexible display device further comprising a polarizer, the polarizer is located between the substrate and the cover plate, and is pasted on the cover plate facing the direction of the cover plate through an adhesive layer. On one side of the substrate, the shear thickening reinforcement is located at at least one of the following positions:

In the shear thickening film layer between the cover plate and the glue layer, and the shear thickening reinforcement is dispersed in the shear thickening film layer;

Inside the glue layer;

In the shear thickening film layer between the glue layer and the polarizer, and the shear thickening reinforcement is dispersed in the shear thickening film layer;

The cover plate is away from the inside of the hardened layer on one side of the polarizer.
A method for preparing the flexible display device according to any one of claims 1-10, comprising:

Providing a substrate with a plurality of light-emitting elements;

Forming a thin film packaging structure on the substrate to seal a plurality of the light-emitting elements on the substrate;

Providing a cover plate, the cover plate is located on the side of the thin film packaging structure formed on the substrate away from the substrate,

And at least one of the cover plate and the film packaging structure is provided with a shear thickening reinforcement member, and the shear thickening reinforcement member is a fiber or a capsule with a shear thickening liquid.
The method according to claim 11, the flexible display device has a rigid area and a flexible area, the flexible display device can be bent from the flexible area, and the shear thickening enhancer has a shear thickening For thick liquid fibers, the method includes:

The shear thickening reinforcement is provided at the film packaging structure, and the fiber located in the rigid zone and the fiber located in the flexible zone meet at least one of the following conditions:

The diameter of the fiber at the rigid zone is greater than the diameter of the fiber at the flexible zone;

The content of the shear thickening liquid infiltrated by the fiber surface in the rigid zone is greater than the content of the shear thickening liquid infiltrated on the fiber surface in the flexible zone;

The content of the fiber in the rigid zone is greater than the content of the fiber in the flexible zone.
The method of claim 11, forming a thin film packaging structure on a substrate includes forming an organic layer and at least one inorganic layer, the organic layer and the inorganic layer are alternately stacked and distributed, and the inorganic layer is in contact with the substrate , The shear thickening reinforcement is located at at least one of the following positions:

Inside the organic layer;

Inside the inorganic layer;

The side of the inorganic layer away from the organic layer; and

Between the organic layer and the inorganic layer.