Coating liquid suitable for projection screen and projection screen

Abstract

The invention relates to the technical field of projection display, and provides a coating liquid suitable for a projection screen and the projection screen. The first aspect of the invention provides a coating liquid suitable for a projection screen. The coating liquid comprises 5-15 parts by weight of a reflective material, 20-50 parts by weight of self-repairing resin, 30-50 parts by weight of a solvent, 1-10 parts by weight of a curing agent and 1-10 parts by weight of an auxiliary agent. The coating liquid provided by the invention is suitable for the projection screen and is particularly used for preparing a reflecting layer, and since the coating liquid comprises the self-repairing resin, when the reflecting layer is scratched, the reflecting layer is triggered to perform self-repairing through certain conditions to recover to a state before the scratch, so that the influence of the scratch on the display effect and the service life of the projection screen is avoided; in addition, the coating liquid provided by the invention is a flexible material, does not influence curling of the projection screen, and is convenient for transportation or use of the projection screen.

Description

Technical Field

[0001] The present application relates to projection display technology, and in particular to a coating liquid suitable for a projection screen and a projection screen. Background Art

[0002] The projection screen mainly includes a surface layer, a coloring layer, a diffusion layer, a Fresnel lens layer and a reflective layer. When the light emitted by the projector is refracted by the screen surface and incident into the interior of the screen, it is reflected by the Fresnel lens layer and the reflective layer and then emitted from the screen and finally enters the human eye. At the same time, the ambient light from the ceiling and surrounding areas is reflected by the Fresnel lens layer and the reflective layer to a place where the human eye cannot see, thus avoiding the influence of ambient light on the viewing effect of the human eye.

[0003] When the reflective layer is directly exposed to the use environment, it is easy to be scratched. The scratched part will produce cracks, making it impossible to reflect light. In addition, the cracks caused by scratches are difficult to repair, which affects the display effect and service life of the projection screen. In order to reduce or avoid the problem of scratches on the reflective layer, a protective layer is set on the outer layer of the reflective layer in the art, that is, the reflective layer and the protective layer in the projection screen are bonded together through an adhesive layer. The material used for the protective layer is generally a flexible material or a rigid material with a certain strength. When the protective layer is a flexible material, the setting of the protective layer will affect the curling of the projection screen, and the curling process will slip, causing the projection screen to deform; when the protective layer is a rigid material, the projection screen cannot be curled, resulting in a large volume of the projection screen when unfolded, and high transportation and protection costs. Summary of the invention

[0004] The present application provides a coating liquid suitable for a projection screen and a projection screen, which solves the problem that scratches on the reflective layer affect the display effect and service life of the projection screen on the basis of realizing the curling function of the projection screen.

[0005] In a first aspect, the present application provides a coating liquid suitable for a projection screen, comprising 5-15 parts by weight of a reflective material, 20-50 parts by weight of a self-healing resin, 30-50 parts by weight of a solvent, 1-10 parts by weight of a curing agent and 1-10 parts by weight of an auxiliary agent.

[0006] The coating liquid provided in the present application is suitable for use in projection screens, especially for preparing reflective layers. Since it includes a self-healing resin, when the reflective layer is scratched, the reflective layer is triggered to self-repair under certain conditions and recover to the state before the scratch, thereby avoiding the impact of scratches on the display effect and service life of the projection screen. In addition, the coating liquid provided in the present application is a flexible material, which does not affect the curling of the projection screen, and is convenient for the transportation or use of the projection screen.

[0007] In some embodiments of the present application, the molecular structure of the self-healing resin includes reversible covalent bonds.

[0008] In some embodiments of the present application, the reversible covalent bond includes one or more of -SS-, -SI-O-, -C=O, and -C=C-.

[0009] In some embodiments of the present application, the molecular structure of the self-healing resin includes polar groups.

[0010] The polar groups in the self-repairing resin structure provided in the present application help to increase the bonding force between the reflective layer and the Fresnel lens layer, thereby improving the adhesion of the reflective layer.

[0011] In some embodiments of the present application, the self-healing resin is one or more of polyurethane resin, epoxy resin, disulfide bond-modified polyurethane resin, disulfide bond-modified epoxy resin, disulfide bond-modified acrylic resin, polymethylsilane, epoxy resin containing silicon-oxygen bonds, polyurethane containing silicon-oxygen bonds, and acrylic resin.

[0012] In some embodiments of the present application, the reflective material is one of aluminum, silver, or a combination of aluminum and silver.

[0013] In some embodiments of the present application, the particle size of the reflective material is 5 μm-50 μm.

[0014] In some embodiments of the present application, the curing agent is one or more of polyamine, amine adduct, and polyamide.

[0015] In some embodiments of the present application, the solvent is one or more of dimethyl oxalate, xylene, methyl butyl ketone, and butyl acetate.

[0016] In some embodiments of the present application, the auxiliary agent includes one or more of a dispersant, a wetting agent, a defoaming agent, a leveling agent, and an antistatic agent.

[0017] In a second aspect, the present application provides a projection screen, comprising a reflective layer, wherein the reflective layer is prepared from any of the coating liquids described above.

[0018] The reflective layer in the projection screen provided in the present application is prepared by the coating liquid provided in the first aspect of the present application. Since it includes a self-healing resin, when the reflective layer is scratched, the reflective layer is triggered to self-repair under certain conditions and restored to the state before the scratch, thereby avoiding the impact of the scratch on the display effect and service life of the projection screen; in addition, the coating liquid provided in the present application is a flexible material, which does not affect the curling of the projection screen, and is convenient for the transportation or use of the projection screen.

[0019] In some embodiments of the present application, the reflective layer includes a first portion and a second portion, the first portion is located in a middle area of ​​the projection screen, and the second portion is located in an edge area of ​​the projection screen;

[0020] The content of the self-healing resin in the coating liquid used for coating the first part is A1, and the content of the self-healing resin in the coating liquid used for coating the second part is A2, and A1<A2.

[0021] The present application divides the areas of the reflective layer according to the possibility of scratches, and uses coating liquids with different self-repairing resin contents to coat different areas. For example, the middle area of ​​the projection screen has a lower probability of being scratched, while the edge area has a higher probability of being scratched. In this case, the coating liquid used to coat the middle area has a lower content of self-repairing resin, while the coating liquid used to coat the edge area has a higher content of self-repairing resin, which helps to take into account both the reflective effect and the self-repairing effect of the reflective layer.

[0022] In some embodiments of the present application, the coating liquid used for coating the first part includes 20-30 parts by weight of a self-healing resin;

[0023] And / or, the coating liquid used for coating the second part comprises 40-50 parts by weight of the self-healing resin.

[0024] In some embodiments of the present application, the area of ​​the first portion is 25% to 60% of the total area of ​​the projection screen, and the area of ​​the second portion is 4% to 10% of the total area of ​​the projection screen.

[0025] The coating liquid provided in the present application is suitable for use in projection screens, especially for preparing reflective layers. Since it includes a self-healing resin, when the reflective layer is scratched, the reflective layer is triggered to self-repair under certain conditions and recover to the state before the scratch, thereby avoiding the impact of scratches on the display effect and service life of the projection screen. In addition, the coating liquid provided in the present application is a flexible material, which does not affect the curling of the projection screen, and is convenient for the transportation or use of the projection screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the implementation methods in the embodiments of the present application or the related technologies, the following is a brief introduction to the drawings required for use in the embodiments or the related technology descriptions. Obviously, the drawings described below are some embodiments of the present application, and a person skilled in the art can also obtain other drawings based on these drawings.

[0027] Figure 1 A schematic diagram of the use status of the projection device provided by the prior art of this application;

[0028] Figure 2 A schematic diagram of the structure of a projection screen provided by the prior art of this application;

[0029] Figure 3 A structural schematic diagram of another projection screen provided by the prior art of this application;

[0030] Figure 4 A schematic diagram of the repair of the self-repairing resin provided in an embodiment of the present application;

[0031] Figure 5 A schematic diagram of the partitions of the projection screen provided in an embodiment of the present application;

[0032] Figure 6 A schematic diagram of partitions of another projection screen provided in an embodiment of the present application.

[0033] Description of reference numerals:

[0034] 1- Projection screen;

[0035] 11-surface layer;

[0036] 12-coloring layer;

[0037] 13- diffusion layer;

[0038] 14-Fresnel lens layer;

[0039] 15-reflection layer;

[0040] 151-Part I;

[0041] 152-Part II;

[0042] 153-Part III;

[0043] 154-Part IV;

[0044] 16- protective layer;

[0045] 2- Projector;

[0046] 3- Ambient light source. DETAILED DESCRIPTION

[0047] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0048] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0049] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components expressly listed but may include other components not expressly listed or inherent to such products or devices.

[0050] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are 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.

[0051] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0052] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0054] In the field of projection display technology, especially in the field of ultra-short-throw laser projection display technology, in order to achieve better brightness and display effects, ultra-short-throw laser projectors are generally used with projection screens with microstructures. Figure 1 This is a schematic diagram of the use status of the projection device provided by the prior art of this application, Figure 2 The schematic diagram of the structure of the projection screen provided by the prior art of this application is as follows: Figure 1-2As shown, the projection screen 1 mainly includes a surface layer 11, a coloring layer 12, a diffusion layer 13, a Fresnel lens layer 14 and a reflective layer 15 along the side close to the human eye to the side far from the human eye. The light emitted by the projector 2 is refracted by the screen surface and incident into the interior of the screen, and is reflected by the Fresnel lens layer 14 and the reflective layer 15, and then emitted from the screen and finally enters the human eye. At the same time, the ambient light generated by the ambient light source 3 from the ceiling and the surroundings is reflected to a place not viewed by the human eye through the Fresnel lens layer 14 and the reflective layer 15, so as to avoid the influence of the ambient light on the viewing effect of the human eye.

[0055] In a specific embodiment, the projector 2 may include a laser, which may be one of a monochromatic laser, a two-color laser, and a three-color laser. The three-color laser may emit a blue laser, a red laser, and a green laser. The wavelength range of the blue laser emitted by the laser may be set to 430nm-460nm, the wavelength range of the green laser emitted may be set to 500nm-540nm, and the wavelength range of the red laser emitted may be set to 610nm-650nm.

[0056] When the reflective layer 15 is directly exposed to the use environment, it is easy to be scratched. The scratched part will produce cracks, which makes it impossible to reflect light. In addition, the cracks caused by scratches are difficult to repair, which affects the display effect and service life of the projection screen. In order to reduce or avoid the problem of scratches on the reflective layer, a protective layer is provided on the outer layer of the reflective layer 15 in the art, that is, the reflective layer in the projection screen is bonded to the protective layer through an adhesive layer. Figure 3 A schematic diagram of the structure of another projection screen provided by the prior art of this application is shown in FIG. Figure 3 As shown, the projection screen 1 further includes a protective layer 16 , which is bonded to the surface of the reflective layer 15 exposed to the use environment, and can play a role in protecting the reflective layer 15 .

[0057] The material used for the protective layer 16 is generally a flexible material or a rigid material with a certain strength. When the protective layer 16 includes a flexible material, the setting of the protective layer 16 will affect the curling of the projection screen 1. For example, slippage may occur during the curling process, causing the projection screen 1 to deform. When the protective layer 16 is a rigid material, the projection screen cannot be curled, resulting in a larger volume of the projection screen 1 when unfolded, affecting the transportation and protection costs of the projection screen 1.

[0058] Based on the above technical problems, in the first aspect, an embodiment of the present application provides a coating liquid suitable for a projection screen, comprising 5-15 parts by weight of a reflective material, 20-50 parts by weight of a self-healing resin, 30-50 parts by weight of a solvent, 1-10 parts by weight of a curing agent and 1-10 parts by weight of an auxiliary agent.

[0059] The weight parts provided in this application refer to the weight proportion of each component in the coating liquid. Those skilled in the art can mix the components according to the above weight parts to obtain the coating liquid.

[0060] The coating liquid provided in the present application includes a self-repairing resin, which can self-repair under certain conditions. When the reflective layer of the projection screen is scratched and cracked, the self-repairing resin is triggered under certain conditions to perform self-repair, refill the cracks, eliminate the impact of the scratches on the projection screen, and restore the projection screen to the state before the scratches; at the same time, the self-repairing resin has a three-dimensional cross-network, and the cross-linking system formed by it can wrap the reflective material inside, which can protect the reflective material and prevent the reflective material from falling off; in addition, the coating liquid provided in the present application is a flexible material, which can realize the curled shape of the projection screen, for example, curled transportation or curled storage after use, which does not affect the curling of the projection screen, thereby facilitating the transportation or use of the projection screen.

[0061] The self-healing resin has high light transmittance (transmittance is higher than 90%). When the light emitted by the projector 2 enters the projection screen and illuminates the reflective layer, it is mainly the reflective material wrapped inside that reflects the light. The self-healing resin has no effect on the optical path and will not affect the display effect.

[0062] In a specific embodiment, the self-healing resin can be a self-healing resin material such as a homopolymer or a copolymer, and its molecular structure includes reversible covalent bonds. Through environmental stimulation, the reaction equilibrium shifts and the covalent bonds are reversibly formed and broken. Figure 4 A schematic diagram of the repair of the self-repairing resin provided in the embodiment of the present application is shown in FIG. Figure 4 As shown, when the reflective layer 15 is scratched due to external force, the molecular structure of the self-repairing resin is destroyed and the covalent bonds are broken. Under certain conditions, such as heat, light and other stimulations, the broken covalent bonds are reconnected to complete the self-repair of the reflective layer 15.

[0063] Further, the reversible covalent bonds include one or more of -SS-, -SI-O-, -C=O, -C=C-. These reversible covalent bonds can be triggered by molecular changes, light changes or temperature changes, and the structure will not respond by temporary shape changes, but will permanently adjust the structure through reversible condensation or covalent bond exchange mechanisms.

[0064] In another specific embodiment, the self-healing resin may include an uncured prepolymer, such as isophorone diisocyanate (IPDI). Under certain conditions, isophorone diisocyanate (IPDI) reacts with active nucleophilic groups such as hydroxyl (-OH) and amino (-NH2) to generate a high molecular polymer to achieve self-healing.

[0065] In a specific embodiment, the molecular structure of the self-healing resin includes polar groups, such as amino, hydroxyl, carbonyl, etc. This type of self-healing resin is similar to the composition in the Fresnel lens layer 14 and is non-repellent. The polar groups in its structure help to increase the bonding force between the reflective layer 15 and the Fresnel lens layer 14 and improve the adhesion of the reflective layer 15.

[0066] In a specific embodiment, the self-healing resin is one or more of polyurethane resin, epoxy resin, disulfide bond-modified polyurethane resin, disulfide bond-modified epoxy resin, disulfide bond-modified acrylic resin, polymethylsilane, epoxy resin containing silicon oxygen bonds, polyurethane containing silicon oxygen bonds, and acrylic resin.

[0067] The molecular weight of the self-healing resin is generally small to ensure good coating and fluidity. In a specific embodiment, the molecular weight of the epoxy resin is 1000-3000, the molecular weight of the polyurethane resin is 5000-10000, and the molecular weight of the acrylic resin is 2000-20000.

[0068] The coating liquid provided in the present application includes a reflective material to realize the reflective function of the reflective layer 15. Specifically, the reflective material is one of aluminum, silver, and a combination of aluminum and silver, which is selected according to conventional technical means in the art.

[0069] Furthermore, the reflective material can be powdered aluminum powder. This is because powdered aluminum powder is more delicate and has less obvious directionality. Most of the light emitted by the projector 2 can be directionally reflected out of the projection screen according to the setting of the microstructure of the Fresnel lens layer 14, without causing the light to be reflected everywhere, thereby improving the display effect of the projection screen.

[0070] Furthermore, the aluminum powder may be one or more of flake aluminum powder, spherical aluminum powder, flaky aluminum powder, and irregular aluminum powder.

[0071] When powdered aluminum powder is used as the reflective material, the particle size of the aluminum particles can be 5μm-50μm. When the particle size of the aluminum particles is not higher than 50μm, due to the small particle size, after forming the reflective layer 15, the aluminum particles will form a dense reflective surface. When light is irradiated on the reflective surface, the light can be reflected as much as possible, thereby avoiding the waste of light energy. At the same time, when powdered aluminum powder is used as the reflective material, the reflective layer 15 can be made very thin, thereby saving aluminum consumption and saving production costs.

[0072] The coating liquid provided in the present application includes a curing agent, which can cross-link with the self-repairing resin to solidify the coating liquid. The curing agent provided in the present application can be a curing agent suitable for the self-repairing resin, for example, the curing agent is one or more of a polyamine, an amine adduct, and a polyamide.

[0073] The coating solution provided in the present application includes a solvent, and the solvent is used to disperse the reflective material, the self-healing resin and other materials, and the solvent is one or more of dimethyl oxalate, xylene, methyl butyl ketone, and butyl acetate. The solvent can be a mixture of one or more solvents, and can be selected according to the resin system in actual use.

[0074] The coating liquid provided in the present application includes an auxiliary agent to improve the comprehensive performance of the reflective layer. In a specific embodiment, the auxiliary agent includes one or more of a dispersant, a wetting agent, a defoaming agent, a leveling agent, and an antistatic agent.

[0075] Furthermore, the dispersant is specifically selected from one or more of polyethylene glycol, polyethylene derivatives, and polydimethylsiloxane.

[0076] The wetting agent is specifically selected from one or both of sodium alkylnaphthalene sulfonate and sodium dodecyl sulfonate.

[0077] The defoaming agent is specifically selected from one or more of higher fatty acids, polypropylene glycol, and isopropanol.

[0078] The leveling agent is selected from one or two of polyacrylic acid and polyfluorinated polyolefin.

[0079] The antistatic agent is selected from one or more of polyvinyl pyrrolidone, polyvinyl formal, and polyethylene glycol ether.

[0080] When the auxiliary agent includes multiple materials, the present application does not limit the ratio between each auxiliary agent, and the specific ratio can be set according to needs.

[0081] It should be noted that since the self-healing resin and the curing agent need to be stored separately to prevent the self-healing resin from undergoing a curing reaction, the weight fractions of the self-healing resin and the curing agent in the coating liquid provided in the present application are based on the weight fractions of the two in a mixed state. When the self-healing resin and the curing agent are not mixed, the present application does not limit the weight fractions of the self-healing resin and the curing agent in the first system including the self-healing resin and the second system including the curing agent, respectively.

[0082] In a second aspect, an embodiment of the present application provides a projection screen, comprising a reflective layer, wherein the reflective layer is prepared from the coating liquid provided in the first aspect of the present application.

[0083] Based on the coating liquid provided in the first aspect of the present application, the reflective layer made therefrom can also achieve a self-repairing effect. When the reflective layer is scratched, the reflective layer is triggered to self-repair under certain conditions and restored to the state before the scratch, thereby avoiding the impact of the scratch on the display effect and service life of the projection screen; in addition, the coating liquid provided in the present application is a flexible material, which does not affect the curling of the projection screen and is convenient for the transportation or use of the projection screen. Those skilled in the art can attach the coating liquid to the Fresnel lens layer according to conventional preparation processes such as spraying, printing, and evaporation, and obtain the reflective layer after curing into a film.

[0084] In a specific embodiment, the components are mixed evenly in a certain ratio to obtain a coating liquid, and the coating liquid is coated on the Fresnel lens layer 14, and after curing into a film, the reflective layer 15 is obtained. Based on the composition of the coating liquid, the reflective layer obtained after the coating liquid is cured into a film can be attached to the Fresnel lens layer 14, but will not react with the Fresnel lens layer 14, and has no effect on the projection screen.

[0085] In a specific embodiment, according to the actual use scenario, the edge area of ​​the projection screen is easily scratched and needs multiple self-repairs, while the middle area is not easily scratched and does not need multiple self-repairs. Therefore, the projection screen can be divided into regions, and coating liquids with different self-repair resin contents are used in different regions. Specifically, the reflective layer includes a first part and a second part, the first part is located in the middle area of ​​the projection screen, and the second part is located in the edge area of ​​the projection screen;

[0086] The content of the self-healing resin in the coating liquid used for coating the first part is A1, and the content of the self-healing resin in the coating liquid used for coating the second part is A2, and A1<A2.

[0087] It can be understood that the edge area of ​​the projection screen is easily scratched. When a coating liquid with a higher content of self-repairing resin is used, multiple self-repairs can be achieved. The middle area of ​​the projection screen is not easily scratched. When a coating liquid with a lower content of self-repairing resin is used, it helps to increase the content of reflective materials, increase the reflectivity of the middle area, and improve the viewing effect.

[0088] The present application does not limit the specific shapes of the first part and the second part. The two parts can be rectangular, quadrilateral, triangle, etc., as long as the middle part and the edge part are distinguished.

[0089] In a specific embodiment, the coating liquid used for coating the first part includes 20-30 parts by weight of a self-healing resin;

[0090] And / or, the coating liquid used for coating the second part comprises 40-50 parts by weight of the self-healing resin.

[0091] It can be understood that the reflective layer provided in the present application may also include other parts located between the first part and the second part. The present application does not limit the number of other parts. For example, Figure 5 A schematic diagram of the partitions of the projection screen provided in the embodiment of the present application, such as Figure 5 As shown, the reflective layer 15 is divided into three parts, the first part 151 is located in the central area of ​​the projection screen, the second part 152 is located in the edge area of ​​the projection screen, and the third part 153 is located between the first part 151 and the second part 152; for another example, Figure 6 A schematic diagram of partitions of another projection screen provided in an embodiment of the present application, such as Figure 6 As shown, the reflective layer 15 is divided into four parts, and a third part 153 and a fourth part 154 are distributed between the first part 151 and the second part 152 . The specific number can be set according to needs.

[0092] When the reflective layer 15 includes other parts besides the first part 151 and the second part 152, the weight fraction of the self-healing resin in the coating liquid used for the other parts can be between A1 and A2, and the closer the distance to the edge of the projection screen, the higher the content of the self-healing resin in the coating liquid used for the part.

[0093] In a specific implementation, the area of ​​the first portion is 25% to 60% of the total area of ​​the projection screen, and the area of ​​the second portion is 4% to 10% of the total area of ​​the projection screen.

[0094] Continue to refer Figure 5 The length and width of the first part 151 are both 1 / 2-3 / 4 of the total length and total width of the projection screen, the length and width of the second part 152 are both 3 / 4-4 / 5 of the total length and total width of the projection screen, and the length and width of the third part 153 are equal to the total length and total width of the projection screen.

[0095] When the projection screen is scratched, according to the characteristics of the self-repairing resin, thermal triggering, light triggering and other methods are used to induce the self-repairing resin to self-repair; for example, the temperature of thermal triggering can be 45-60°C, and the insulation time can be 6-10h; light triggering can use 800nm ​​infrared light to irradiate the crack to induce self-repair; or, chemical reaction can be used to make the uncured prepolymer in the self-repairing resin react to complete the crack repair.

[0096] In summary, the coating liquid provided in the present application can be used to prepare the reflective layer of the projection screen, and the reflective layer material is a flexible material, which does not affect the curling of the projection screen and facilitates the transportation or use of the projection screen.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0098] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A coating liquid suitable for a projection screen, characterized in that: The invention comprises 5-15 parts by weight of a reflective material, 20-50 parts by weight of a self-repairing resin, 30-50 parts by weight of a solvent, 1-10 parts by weight of a curing agent and 1-10 parts by weight of an auxiliary agent.

2. The coating solution according to claim 1, characterized in that The self-healing resin includes reversible covalent bonds in its molecular structure.

3. The coating solution according to claim 2, characterized in that The reversible covalent bond includes one or more of -SS-, -SI-O-, -C=O, and -C=C-.

4. The coating solution according to claim 1, characterized in that The molecular structure of the self-repairing resin includes polar groups.

5. The coating solution according to any one of claims 1 to 4, characterized in that: The self-healing resin is one or more of polyurethane resin, epoxy resin, disulfide bond-modified polyurethane resin, disulfide bond-modified epoxy resin, disulfide bond-modified acrylic resin, polymethylsilane, epoxy resin containing silicon oxygen bond, polyurethane containing silicon oxygen bond, and acrylic resin.

6. The coating solution according to any one of claims 1 to 5, characterized in that: The reflective material is one of aluminum, silver, and a combination of aluminum and silver.

7. A projection screen, characterized in that: It comprises a reflective layer, and the reflective layer is prepared from the coating liquid according to any one of claims 1 to 6.

8. The projection screen according to claim 7, characterized in that: The reflective layer comprises a first portion and a second portion, the first portion is located in a middle area of ​​the projection screen, and the second portion is located in an edge area of ​​the projection screen; The content of the self-healing resin in the coating liquid used for coating the first part is A1, and the content of the self-healing resin in the coating liquid used for coating the second part is A2, and A1<A2.

9. The projection screen according to claim 8, characterized in that The coating liquid used for coating the first part includes 20-30 parts by weight of a self-healing resin; And / or, the coating liquid used for coating the second part comprises 40-50 parts by weight of the self-healing resin.

10. The projection screen according to claim 8 or 9, characterized in that: The area of ​​the first part is 25% to 60% of the total area of ​​the projection screen, and the area of ​​the second part is 4% to 10% of the total area of ​​the projection screen.

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