Protective film and preparation method thereof, display assembly and display device

Abstract

The invention provides a protective film and a preparation method thereof, a display assembly and a display device. The protective film comprises a self-repairing layer and a surface layer which are arranged in a stacked mode, and materials of the self-repairing layer and the surface layer both comprise coumarin derivatives. Wherein when the surface layer generates a crack and the crack penetrates through the surface layer, the crack is in contact with the self-repairing layer, and the self-repairing layer and the coumarin derivative of the surface layer are subjected to photopolymerization reaction under a first preset condition so as to repair the crack. By arranging the self-repairing layer and the surface layer which are prepared from the coumarin derivative, when the surface layer generates cracks penetrating through the surface layer due to impact or scratching of foreign objects, interface crosslinking can be initiated under the first preset condition, so that the self-repairing layer and the coumarin derivative of the surface layer are subjected to photopolymerization reaction, and the cracks are quickly repaired; cracks of the protective film are reduced or even eliminated, the influence of the cracks on the visual effect is reduced, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of display devices, and specifically relates to a protective film and a preparation method thereof, a display component, and a display device. Background Art

[0002] Currently, display screens in display devices typically use glass or rigid polymers as protective films to protect the display. However, these protective films are highly brittle and easily break under external impact, causing the display to lose its function. They are also sensitive to scratches, which affects the visual effect and cannot be repaired independently, requiring the entire display to be replaced, which is costly. Summary of the Invention

[0003] In view of this, the first aspect of the present application provides a protective film, which includes a self-repairing layer and a surface layer arranged in a stacked manner, and the materials of the self-repairing layer and the surface layer both include coumarin derivatives; wherein, when a crack occurs in the surface layer, the crack penetrates the surface layer, and the crack contacts the self-repairing layer, and the self-repairing layer and the coumarin derivative of the surface layer undergo a photopolymerization reaction under a first preset condition to repair the crack.

[0004] The surface layer is prepared from a first coating, and the self-repairing layer is prepared from a second coating. The materials of the first coating and the second coating both include a polymer prepolymer, a coumarin monomer, and silicon dioxide.

[0005] The mass proportion of silicon dioxide in the first coating is greater than the mass proportion of silicon dioxide in the second coating.

[0006] Wherein, in the first coating, the mass percentages of polymer prepolymer, coumarin monomer, and silicon dioxide are (70%-85%): (3%-8%): (5%-12%);

[0007] In the second coating, the mass percentages of the polymer prepolymer, the coumarin monomer, and the silicon dioxide are (70%-85%): (5%-8%): (5%-10%).

[0008] The materials of the first coating and the second coating both further include a photoinitiator, and the mass percentage of the photoinitiator in the first coating and the second coating is 3%-8%.

[0009] Wherein, the thickness ratio of the surface layer to the self-repairing layer is 1:(50-100).

[0010] The materials of the self-repairing layer and the surface layer both include cross-linked polymers containing disulfide bonds and hydrogen bonds. When cracks occur in the surface layer, the disulfide bonds and hydrogen bonds at the cracks are reconnected to repair the cracks.

[0011] The protective film further comprises an adhesive layer, which is provided on a side of the self-repairing layer away from the surface layer, and is used for bonding and connecting the display screen.

[0012] A second aspect of the present application provides a method for preparing a protective film, the method comprising:

[0013] forming a self-repairing layer, wherein the material of the self-repairing layer includes a coumarin derivative;

[0014] forming a surface layer disposed on the self-repairing layer, wherein the material of the surface layer includes a coumarin derivative;

[0015] controlling the coumarin derivative of the surface layer to undergo a photodecomposition reaction under a second preset condition;

[0016] The protective film provided in the first aspect of the present application is obtained.

[0017] A third aspect of the present application provides a display assembly, which includes a display screen and a protective film as provided in the first aspect of the present application, wherein the protective film is provided on the display screen.

[0018] The fourth aspect of the present application provides a display device, which includes a shell and a display assembly as provided in the third aspect of the present application, wherein the display screen of the display assembly is mounted on the shell, and the protective film of the display assembly is disposed on the outer surface of the display screen.

[0019] The protective film and its preparation method, display assembly, and display device provided in the present application are provided with a self-repairing layer and a surface layer prepared from coumarin derivatives. When the surface layer is cracked due to impact or scratching by an external object, interfacial cross-linking can be initiated under a first preset condition, so that the self-repairing layer and the coumarin derivatives in the surface layer undergo a photopolymerization reaction, thereby achieving rapid repair of the cracks, reducing or even eliminating the cracks in the protective film, reducing the impact of the cracks on the visual effect, and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0021] Figure 1 A schematic structural diagram of a protective film provided in one embodiment of the present application.

[0022] Figure 2A schematic structural diagram of a protective film provided in another embodiment of the present application.

[0023] Figure 3 A schematic flow chart of a method for preparing a protective film according to one embodiment of the present application.

[0024] Figure 4 A schematic structural diagram of a display assembly provided in one embodiment of the present application.

[0025] Figure 5 A schematic structural diagram of a display device provided in one embodiment of the present application.

[0026] Explanation of reference numerals: protective film 1 , surface layer 11 , self-repairing layer 12 , adhesive layer 13 , display assembly 2 , display screen 21 , display device 3 , housing 31 . DETAILED DESCRIPTION

[0027] The following are preferred implementations of the present application. It should be noted that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

[0028] Before introducing the technical solutions of the present application, the technical problems in the related technologies are introduced in detail.

[0029] Currently, display screens in display devices typically use glass or rigid polymers as protective films to protect the display. However, these protective films are highly brittle and easily break under external impact, causing the display to lose its function. They are also sensitive to scratches, which affects the visual effect and cannot be repaired independently, requiring the entire display to be replaced, which is costly.

[0030] Currently, commonly used self-healing materials are mostly used for automotive coatings or industrial protection, such as polyurethane containing microcapsules. However, the microcapsules or fillers in these self-healing materials easily cause light scattering, making them unsuitable for use as protective films for display screens. They also have high repair requirements, requiring high temperatures or pressure to trigger, and their hardness decreases after repair, making them less resistant to secondary damage.

[0031] In view of this, in order to solve the above problems, please refer to Figure 1-Figure 2 This embodiment provides a protective film 1, which includes a self-repairing layer 12 and a surface layer 11 that are stacked together. The materials of the self-repairing layer 12 and the surface layer 11 both include coumarin derivatives. When a crack occurs in the surface layer 11 and the crack penetrates the surface layer 11, the crack contacts the self-repairing layer 12, and the self-repairing layer 12 and the coumarin derivative of the surface layer 11 undergo a photopolymerization reaction under a first preset condition to repair the crack.

[0032] The protective film 1 can be applied to a display assembly, which includes a display screen and the protective film 1. The protective film 1 can be bonded to the display screen to protect it. The display screen has a display function, capable of displaying images or text information. When the protective film 1 is applied to the display screen, the self-healing layer 12 is closer to the display screen than the surface layer 11. The surface layer 11 serves as the outer surface of the protective film 1 that contacts the external environment and the user.

[0033] The display assembly can be applied to a display device, which includes a display assembly and a housing. The display screen is mounted in the housing, and the protective film 1 is disposed on the outer surface of the display screen. In other words, the display surface of the display screen is exposed from the housing, and the protective film 1 is disposed on the display surface of the display screen. Display devices include, but are not limited to, LED display devices, miniLED display devices, or OLED display devices.

[0034] This embodiment is only schematically illustrated by applying the protective film 1 to a display device. However, this does not mean that the protective film 1 of this embodiment must be applied to a display device. The protective film 1 provided in this embodiment can also be applied to electronic devices provided with display screens, including but not limited to mobile phones, tablet computers, laptop computers, PDAs, personal computers (Personal Computer, PC), personal digital assistants (Personal Digital Assistant, PDA), portable media players (Portable Media Player, PMP), navigation devices, wearable devices, smart bracelets, pedometers and other mobile terminals, as well as fixed terminals such as digital TVs and desktop computers. This embodiment does not limit the types of electronic devices. In other embodiments, the protective film 1 can also be applied to other fields, such as the automotive field, industrial protection field, etc.

[0035] A crack is a break in the surface layer 11 caused by an impact or scratch on the surface layer 11. A crack in the surface layer 11 can also be understood as a crack that penetrates the surface layer 11 along the thickness direction. Furthermore, repairing a crack means patching the crack to restore the outer surface of the surface layer 11 to a smooth and intact state.

[0036] The materials of both the self-healing layer 12 and the surface layer 11 include coumarin derivatives. Under certain preset conditions, the self-healing layer 12 and the coumarin derivatives of the surface layer 11 undergo a [2+2] cycloaddition reaction. That is, the double bonds in the coumarin molecules undergo a cycloaddition reaction, promoting the recombination of chemical bonds at the crack interface to repair the crack. Optionally, the coumarin derivative includes a covalently grafted coumarin derivative.

[0037] The first preset condition is ultraviolet light with a wavelength of 330nm-400nm. Specifically, the wavelength of the ultraviolet light of the first preset condition can be exemplified by 330nm, 335nm, 340nm, 345nm, 350nm, 355nm, 360nm, 365nm, 370nm, 375nm, 380nm, 385nm, 390nm, 395nm, or 400nm. By irradiating the protective film 1 with ultraviolet light with a wavelength of 330nm-400nm, the self-repairing layer 12 and the coumarin derivative of the surface layer 11 are cross-linked at the interface, causing a photopolymerization reaction, thereby achieving rapid repair of cracks. For example, under irradiation with 365nm ultraviolet light, micron-sized cracks on the surface layer 11 can be repaired within 5 minutes.

[0038] Optionally, the duration of the first preset condition is 5 minutes to 15 minutes. Specifically, the duration of the first preset condition can be 5 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes, 10 minutes, 11 minutes, 12 minutes, 13 minutes, 14 minutes, 15 minutes, etc.

[0039] In summary, the protective film 1 provided in this embodiment is provided with a self-repairing layer 12 and a surface layer 11 prepared from coumarin derivatives. When the surface layer 11 is cracked due to impact or scratching by foreign objects, interfacial cross-linking can be initiated under a first preset condition, so that the self-repairing layer 12 and the coumarin derivatives of the surface layer 11 undergo a photopolymerization reaction, thereby achieving rapid repair of the cracks, reducing or even eliminating the cracks in the protective film 1, reducing the impact of the cracks on the visual effect, and reducing maintenance costs.

[0040] In one embodiment, the surface layer 11 is prepared from a first coating, and the self-repairing layer 12 is prepared from a second coating. The materials of the first coating and the second coating both include polymer prepolymer, coumarin monomer, and silicon dioxide.

[0041] The mass proportion of silicon dioxide in the first coating is greater than the mass proportion of silicon dioxide in the second coating.

[0042] The polymer prepolymer can form a polymer dynamic cross-linking network, serving as a base material for the surface layer 11 and the self-repairing layer 12. Optionally, the polymer prepolymer includes at least one of a polysiloxane prepolymer, a polyurethane acrylate prepolymer, and an epoxy resin prepolymer.

[0043] Coumarin monomers can form coumarin derivatives, which serve as repair agents for the surface layer 11 and the self-repairing layer 12. Optionally, the mass ratio of the coumarin monomer in the first coating is less than the mass ratio of the coumarin monomer in the second coating. Optionally, the mass ratio of the coumarin monomer in the first coating to the coumarin monomer in the second coating is 1:(1.5-2.5), with specific examples being 1:1.5, or 1:2, or 1:2.5, etc. In this embodiment, by limiting the mass ratio of the coumarin monomer in the second coating to a higher level, the self-repairing layer 12 contains more coumarin derivatives, thereby giving the self-repairing layer 12 a stronger repair function, which is beneficial for cooperating with the surface layer 11 to repair cracks.

[0044] Silicon dioxide can improve the hardness and scratch resistance of the surface layer 11 and the self-repairing layer 12, and serves as a reinforcing agent for the surface layer 11 and the self-repairing layer 12. The mass ratio of silicon dioxide in the first coating is greater than the mass ratio of silicon dioxide in the second coating, so the mass ratio of silicon dioxide in the surface layer 11 is greater than the mass ratio of silicon dioxide in the self-repairing layer 12. Optionally, the mass ratio of silicon dioxide in the first coating to silicon dioxide in the second coating is (1.5-2.5):1, specifically, for example, 1.5:1, or 2:1, or 2.5:1, etc.

[0045] This embodiment limits the proportion of silica in the coating to different levels, which not only makes the surface layer 11 contain more silica, so that the surface layer 11, as a high cross-linking density layer, has better scratch resistance and reduces the occurrence of cracks, but also makes the self-repairing layer 12 contain less silica, which increases the toughness of the self-repairing layer 12, which is beneficial to reducing the damage to the protective film 1 caused by external impact, and thus enables the surface layer 11 and the self-repairing layer 12 to cooperate with each other, further improving the protective ability of the protective film 1 and reducing the occurrence of cracks.

[0046] Optionally, the silicon dioxide is silicon dioxide particles. Further, optionally, the particle size of the silicon dioxide particles is ≤20 nm. Specific examples of the particle size of the silicon dioxide particles include 20 nm, 18 nm, 15 nm, 13 nm, 10 nm, 8 nm, 5 nm, or 3 nm. In this embodiment, the use of silicon dioxide particles can also reduce light scattering, thereby reducing the impact of the protective film 1 on the display effect of the display screen.

[0047] Wherein, in the first coating, the mass percentages of the polymer prepolymer, the coumarin monomer, and the silicon dioxide are (70%-85%): (3%-8%): (5%-12%).

[0048] In the first coating, the mass percentage of the polymer prepolymer can be specifically exemplified by 70%, 75%, 80%, 85%, etc.; the mass percentage of the coumarin monomer can be specifically exemplified by 3%, 4%, 5%, 6%, 7%, 8%, etc.; the mass percentage of silica can be specifically exemplified by 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, etc.

[0049] In the second coating, the mass percentages of the polymer prepolymer, the coumarin monomer, and the silicon dioxide are (70%-85%): (5%-8%): (5%-10%).

[0050] In the second coating, the mass percentage of the polymer prepolymer can be specifically exemplified by 70%, 75%, 80%, 85%, etc.; the mass percentage of the coumarin monomer can be specifically exemplified by 5%, 6%, 7%, 8%, etc.; the mass percentage of silica can be specifically exemplified by 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, etc.

[0051] In one embodiment, the materials of the first coating and the second coating further include a photoinitiator, and the mass percentage of the photoinitiator in the first coating and the second coating is 3%-8%.

[0052] The photoinitiator can make the surface layer 11 and the self-repairing layer 12 sensitive to light, initiating a reaction in the material under the action of light, further increasing the reaction rate of the coumarin derivative of the self-repairing layer 12 and the surface layer 11 under the first preset conditions, thereby improving the efficiency of crack repair. Optionally, the photoinitiator includes but is not limited to benzoin ether initiators, acetophenone initiators, acylphosphine oxide initiators, etc.

[0053] In the first coating, the mass percentage of the photoinitiator can be specifically exemplified as 3%, 4%, 5%, 6%, 7%, or 8%.

[0054] In the second coating, the mass percentage of the photoinitiator can be specifically exemplified as 3%, 4%, 5%, 6%, 7%, 8%, etc.

[0055] Please refer to Figure 1 In one embodiment, the thickness ratio of the surface layer 11 to the self-repairing layer 12 is 1:(50-100).

[0056] The thickness ratio of the surface layer 11 to the self-repairing layer 12 can be 1:50, 1:60, 1:70, 1:80, 1:90, 1:100, etc. The thickness of the surface layer 11 is as follows: Figure 1 As shown in L1, the thickness of the self-repairing layer 12 is as follows Figure 1As shown in L2.

[0057] Optionally, the thickness of the surface layer 11 is 1 μm to 5 μm, and the thickness of the self-repairing layer 12 is 50 μm to 100 μm. The thickness of the surface layer 11 can be 1 μm, 2 μm, 3 μm, 4 μm, or 5 μm, and the thickness of the self-repairing layer 12 can be 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, or 100 μm, etc.

[0058] Therefore, this embodiment limits the thickness ratio of the surface layer 11 to the self-repairing layer 12, which not only makes the thickness of the surface layer 11 thinner, so that after cracks are generated in the surface layer 11, the cracks can more easily contact with the self-repairing layer 12 to repair the cracks, but also makes the thickness of the self-repairing layer 12 thicker, which can improve the overall protective performance of the protective layer, and also enables the self-repairing layer 12 to store enough repair agent to repair cracks multiple times.

[0059] In one embodiment, the materials of the self-repairing layer 12 and the surface layer 11 both include cross-linked polymers containing disulfide bonds and hydrogen bonds; wherein, when cracks are generated in the surface layer 11, the disulfide bonds and hydrogen bonds at the cracks are reconnected to repair the cracks.

[0060] The polymer can form a dynamic cross-linked network, serving as a basis for the surface layer 11 and the self-repairing layer 12. Optionally, the polymer includes at least one of polysiloxane, polyurethane acrylate, and epoxy resin.

[0061] The polymer contains disulfide bonds and hydrogen bonds. When cracks occur in the surface layer 11, the disulfide bonds and hydrogen bonds at the cracks will recombine at the fracture surface at room temperature, slowly repairing the cracks. The crack repair rate can reach ≥90% within 24 hours.

[0062] Therefore, this embodiment adopts a polymer containing disulfide bonds and hydrogen bonds, so that the protective film 1 has the function of self-repairing at room temperature and the function of rapid repair under the first preset conditions, which can match different repair scenarios and is suitable for different cracks.

[0063] Please refer to Figure 2 In one embodiment, the protective film 1 further includes an adhesive layer 13, which is provided on a side of the self-repairing layer 12 away from the surface layer 11, and the adhesive layer 13 is used to bond and connect the display screen.

[0064] Adhesive layer 13 and surface layer 11 are disposed on opposite sides of self-repairing layer 12. Optionally, adhesive layer 13 comprises an adhesive, such as a light-curable acrylate. Adhesive layer 13 bonds self-repairing layer 12 and the display screen, thereby bonding protective film 1 to the display screen.

[0065] Please refer to Figure 1-Figure 3 The present application also provides a method for preparing a protective film 1, the method comprising:

[0066] S100 , forming a self-repairing layer 12 , wherein the material of the self-repairing layer 12 includes a coumarin derivative.

[0067] S200 , forming a surface layer 11 on the self-repairing layer 12 , wherein the material of the surface layer 11 includes a coumarin derivative.

[0068] S300 , controlling the coumarin derivatives in the surface layer 11 to undergo a photodecomposition reaction under a second preset condition.

[0069] S400, obtaining the protective film 1 provided above in this application.

[0070] The second preset condition is ultraviolet light with a wavelength of 230nm-280nm. Specifically, the wavelength of the ultraviolet light of the first preset condition can be 230nm, 235nm, 240nm, 245nm, 250nm, 255nm, 260nm, 265nm, 270nm, 275nm, or 280nm. By irradiating the protective film 1 with ultraviolet light with a wavelength of 230nm-280nm, the self-repairing layer 12 and the coumarin derivative of the surface layer 11 undergo a photodecomposition reaction, providing a basis for the coumarin derivative of the surface layer 11 to cross-link with the coumarin derivative of the self-repairing layer 12 when cracks are subsequently generated.

[0071] Optionally, the duration of the second preset condition is 5 minutes to 15 minutes. Specifically, the duration of the second preset condition can be 5 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes, 10 minutes, 11 minutes, 12 minutes, 13 minutes, 14 minutes, 15 minutes, etc.

[0072] In one embodiment, the first coating and the second coating are prepared by dissolving a polymer prepolymer containing disulfide bonds and hydrogen bonds, a coumarin monomer, silica, and a photoinitiator in tetrahydrofuran according to the ratio of the first coating and the second coating, and ultrasonically dispersing them to obtain the first coating and the second coating.

[0073] Forming the self-repairing layer 12: The second coating is coated on the substrate and pre-cured at 60° C. to form a dynamically cross-linked self-repairing layer 12. The substrate is used to support the second coating, for example, the substrate is a PET substrate.

[0074] Forming the surface layer 11: coating the first coating on the self-repairing layer 12 and pre-curing it at 60° C. to form a dynamically cross-linked surface layer 11 .

[0075] Processing the surface layer 11: Irradiating the surface layer 11 with 254 nm ultraviolet light for 10 minutes to complete the highly cross-linked structure of the surface layer 11, thereby obtaining the protective film 1 provided above in the present application.

[0076] In summary, the preparation method of the protective film 1 provided in the present application forms a self-repairing layer 12 and a surface layer 11 prepared from coumarin derivatives. When the surface layer 11 is cracked due to impact or scratching by foreign objects, interfacial cross-linking can be initiated under a first preset condition, so that the self-repairing layer 12 and the coumarin derivatives of the surface layer 11 undergo a photopolymerization reaction, thereby achieving rapid repair of the cracks, reducing or even eliminating the cracks in the protective film 1, reducing the impact of the cracks on the visual effect, and reducing maintenance costs.

[0077] Please refer to Figures 1-4 The present application also provides a display assembly 2 , which includes a display screen 21 and a protective film 1 as provided above in the present application, wherein the protective film 1 is provided on the display screen 21 .

[0078] Please refer to Figure 1-Figure 5 The present application also provides a display device 3, which includes a shell 31 and a display component 2 as provided above in the present application. The display screen 21 of the display component 2 is installed in the shell 31, and the protective film 1 of the display component 2 is provided on the outer surface of the display screen 21.

[0079] The display assembly 2 and display device 3 provided in this embodiment adopt the protective film 1 provided above in this application. The protective film 1 is provided with a self-repairing layer 12 and a surface layer 11 prepared from coumarin derivatives. When the surface layer 11 is impacted or scratched by an external object and cracks penetrating the surface layer 11 are generated, interfacial cross-linking can be initiated under a first preset condition, so that the self-repairing layer 12 and the coumarin derivatives of the surface layer 11 undergo a photopolymerization reaction, thereby achieving rapid repair of the cracks, reducing or even eliminating the cracks in the protective film 1, reducing the impact of the cracks on the visual effect, and reducing maintenance costs.

[0080] Unless otherwise specified or incompatible therewith, terms and phrases used in this application shall have the following meanings:

[0081] In this application, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of the features.

[0082] In this application, "one or several" refers to any one, any two, or any two or more of the listed items. Among them, "several" refers to any two or any two or more.

[0083] In the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0084] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connections, removable connections, or integration. They may refer to mechanical connections or electrical connections. They may refer to direct connections or indirect connections through an intermediary. They may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0085] Mentioning "embodiments" and "implementation methods" in this application means that the specific features, structures or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrases in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments. In addition, it should be understood that the features, structures or characteristics described in the various embodiments of the present application can be arbitrarily combined to form another embodiment that does not deviate from the spirit and scope of the technical solution of the present application, unless there is a contradiction between them.

[0086] The above is part of the implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A protective film, characterized in that: The protective film includes a self-repairing layer and a surface layer that are stacked together, and the materials of the self-repairing layer and the surface layer both include coumarin derivatives; wherein, when a crack occurs in the surface layer and the crack penetrates the surface layer, the crack contacts the self-repairing layer, and the self-repairing layer and the coumarin derivative of the surface layer undergo a photopolymerization reaction under a first preset condition to repair the crack.

2. The protective film according to claim 1, wherein The surface layer is prepared from a first coating, and the self-repairing layer is prepared from a second coating, wherein the materials of the first coating and the second coating both include a polymer prepolymer, a coumarin monomer, and silicon dioxide; The mass proportion of silicon dioxide in the first coating is greater than the mass proportion of silicon dioxide in the second coating.

3. The protective film according to claim 2, wherein In the first coating, the mass percentages of polymer prepolymer, coumarin monomer, and silicon dioxide are (70%-85%): (3%-8%): (5%-12%); In the second coating, the mass percentages of the polymer prepolymer, the coumarin monomer, and the silicon dioxide are (70%-85%): (5%-8%): (5%-10%).

4. The protective film according to claim 2, wherein The materials of the first coating and the second coating both further include a photoinitiator, and the mass percentage of the photoinitiator in the first coating and the second coating is 3%-8%.

5. The protective film according to claim 1, wherein The thickness ratio of the surface layer to the self-repairing layer is 1:(50-100).

6. The protective film according to claim 1, wherein The materials of the self-repairing layer and the surface layer both include cross-linked polymers, and the polymers contain disulfide bonds and hydrogen bonds; wherein, when cracks are generated in the surface layer, the disulfide bonds and hydrogen bonds at the cracks are reconnected to repair the cracks.

7. The protective film according to claim 1, wherein The protective film further comprises an adhesive layer, which is arranged on a side of the self-repairing layer away from the surface layer, and is used for bonding and connecting the display screen.

8. A method for preparing a protective film, characterized in that: The preparation method comprises: forming a self-repairing layer, wherein the material of the self-repairing layer includes a coumarin derivative; forming a surface layer disposed on the self-repairing layer, wherein the material of the surface layer includes a coumarin derivative; controlling the coumarin derivative of the surface layer to undergo a photodecomposition reaction under a second preset condition; The protective film according to claim 1 is obtained.

9. A display component, characterized in that: The display assembly includes a display screen and a protective film according to any one of claims 1 to 7, wherein the protective film is provided on the display screen.

10. A display device, characterized in that: The display device includes a housing and the display assembly as claimed in claim 9, wherein the display screen of the display assembly is mounted on the housing, and the protective film of the display assembly is disposed on the outer surface of the display screen.

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