Projection Screen

Abstract

The utility model discloses a projection screen, which relates to the field of projection display technology. The projection screen includes: a substrate layer; a grating prism structure layer, an array is arranged on one side of the substrate layer; reflective particles are evenly arranged in the grating prism structure layer; and light-absorbing particles are arranged in the grating prism structure layer; wherein the light-absorbing particles are located away from the substrate layer and gathered on one side surface of the grating prism structure layer; or, the light-absorbing particles are located away from the substrate layer and gathered on the other side surface of the grating prism structure layer, so that the projection screen has both light-absorbing and light-reflecting functions. The utility model solves the problem in the prior art that the black grid screen still has complex alignment and bonding, requires micron-level precise alignment, and alignment deviation leads to poor consistency in mass production and thus poor visual effects. In addition, due to multiple composite processes, it leads to high production costs.

Description

Technical Field

[0001] The utility model relates to the technical field of projection display, in particular to a projection screen. Background Art

[0002] Existing laser projection display technology has been increasingly used because of its low cost in ultra-large-size displays (such as ≥100 inches). However, due to its unique display method, it needs to be used with an anti-ambient light curtain to improve the display contrast to obtain sufficient picture clarity. Otherwise, the curtains and indoor lights need to be closed to achieve better results.

[0003] Currently, the mainstream anti-glare screens include Fresnel anti-ambient light screens and black grid screens. Fresnel screens have a relatively high cost due to the complex processing of their large-scale arc-shaped microstructures. Therefore, black grid screens are becoming more and more popular due to their low cost and excellent anti-ambient light effect.

[0004] However, in the prior art, the alignment of black grille cloth is still complicated, requiring micron-level precise alignment. Alignment deviation leads to poor consistency in mass production and poor visual effects. In addition, due to multiple composite processes, the production cost is high. No effective solution has been proposed for the above problems. Utility Model Content

[0005] Purpose of the utility model: to provide a projection screen and a method for preparing the same, so as to at least solve one of the problems existing in the above-mentioned prior art.

[0006] Technical solution: A projection screen comprises: a substrate layer; a grating prism structure layer, an array of which is arranged on one side of the substrate layer; reflective particles, which are evenly arranged in the grating prism structure layer; and light-absorbing particles, which are arranged in the grating prism structure layer; wherein the light-absorbing particles are located away from the substrate layer and gathered on one side surface of the grating prism structure layer; or, the light-absorbing particles are located away from the substrate layer and gathered on the other side surface of the grating prism structure layer, so that the projection screen has both light-absorbing and light-reflecting functions.

[0007] Preferably, the light-absorbing particles are micrometer- or nanometer-scale magnetic microbeads of dark metal or metal oxide.

[0008] Preferably, the substrate layer is one or more of a PET film, a PVC film, an EVA film, a TPU film, a PU film, a PP film, a PMMA film, a PC film or a PS film.

[0009] Preferably, the reflective particles are one or more of silver paste, glass beads, and titanium oxide.

[0010] Preferably, the cross-section of the grating prism structure layer has at least two surfaces.

[0011] Preferably, the cross section is a semicircular surface or an approximately tangent surface.

[0012] Preferably, the bottom length of the cross section is 5-5000 μm, and the height is 0.05-1 times of the bottom length.

[0013] Preferably, the light absorbing particles are spherical or columnar in shape, and have a size range of 10-10000 nm.

[0014] In order to achieve the above objective, according to another aspect of the present application, a method for preparing a projection screen is also provided.

[0015] The projection screen preparation method according to the present application comprises the following steps:

[0016] Step 1: preparing a mold having a grating prism structure;

[0017] Step 2: Obtain light-absorbing material and light-reflecting material; wherein the light-absorbing material is black or similar color metal or metal oxide micrometer or nanometer magnetic microbeads; the light-reflecting material is one or more of silver paste, glass microbeads, and titanium oxide;

[0018] Step 3: Fully stir and evenly mix the light-curing material with the light-absorbing material and the light-reflecting material in a preset ratio to obtain a light-curing coating mixture for embossing the projection screen microstructure;

[0019] Step 4: coating the light-curing coating mixture on the substrate layer;

[0020] Step 5: Use the mold prefabricated in step 1 to emboss the photocurable coating mixture on the substrate layer to form a grating prism structure; at the same time, use heat, electricity or magnetism to apply heat conduction, electric field or magnetic field force on one or both sides of the mold and the substrate layer according to preset requirements, so as to directionally move the light-absorbing material to a preset side surface of the grating prism structure;

[0021] Step 6: After the imprinting, heat conduction, electric field or magnetic field force is applied, and before the mold is released, the photocuring adhesive is cured by heating, ultraviolet light or electron beam curing to obtain the desired grating prism structure layer shape, and the light-absorbing material and the light-reflecting material in the photocuring adhesive are fixed at the specified position in the grating prism structure;

[0022] Step 7: Separate the mold from the light-curing adhesive to obtain a black grid curtain.

[0023] Preferably, the components of the photocurable coating mixture include: 50%-70% by weight of acrylic monomer, 10%-50% by weight of iron oxide microbeads, 5%-20% by weight of reflective material, 1-5% by weight of photoinitiator, and 0.1%-1% by weight of leveling and lubricating agent; wherein the reflective material is glass microbeads, titanium oxide or silver paste.

[0024] Beneficial effect: In the embodiment of the present application, by means of preset light-absorbing particles and light-reflecting particles, the light-absorbing particles are located on the side away from the substrate layer and gathered on one side surface of the grating prism structure layer; or the light-absorbing particles are located on the side away from the substrate layer and gathered on the other side surface of the grating prism structure layer, so that the projection screen has both light-absorbing and light-reflecting functions, and the purpose of achieving light-absorbing and light-reflecting on the upper and lower sides of the grating prism structure layer respectively is achieved, thereby achieving the technical effect of the projection screen's resistance to ambient light, thereby solving the problem in the prior art that the black grid screen still has complex alignment and bonding, requires micron-level precise alignment, and alignment deviation leads to poor mass production consistency and thus poor visual effects. In addition, due to multiple composite processes, the production cost is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the planar structure of the projection screen of the utility model;

[0026] Figure 2 The cross section of the projection screen of the utility model is a schematic diagram of the long upper side plane structure;

[0027] Figure 3 It is a schematic diagram of the cross section of another projection screen of the utility model, which is a long upper side plane structure;

[0028] Figure 4 The cross section of the projection screen of the utility model is a schematic diagram of the short upper side plane structure;

[0029] Figure 5 It is a schematic diagram of a short upper side plane structure of another projection screen of the utility model;

[0030] Figure 6 It is a schematic diagram of the structure of the projection screen of the utility model, the cross section of which is a hemispherical plane; and

[0031] Figure 7 It is a schematic diagram of the magnetic field movement of the projection screen plane of the utility model.

[0032] The accompanying drawings are marked as follows:

[0033] 10. Base material layer;

[0034] 20, grating prism structure layer; 201, upper side surface; 202, lower side surface;

[0035] 30. Reflective particles;

[0036] 40. Light-absorbing particles. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are 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 should fall within the scope of protection of the present application.

[0038] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0040] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] In order to better understand the present application, it is necessary to know that when the projector is in use, ambient light such as external sunlight or lighting entering the projection screen from above is absorbed by the black light-absorbing layer of the screen microstructure, while the projected image entering the projection screen from below is reflected to the viewer's eyes through the reflective layer of the screen microstructure, achieving a better viewing effect.

[0042] The present application relates to a projection screen and a method for preparing the same. Figure 1-6As shown, the projection screen includes: a substrate layer 10; the substrate layer 10; the substrate layer 10 refers to a basic material layer, which can achieve a good supporting effect; at the same time, it can also cooperate with other components to achieve multiple functional effects.

[0043] Preferably, the substrate layer 10 is one or more of PET film, PVC film, EVA film, TPU film, PU film, PP film, PMMA film, PC film or PS film. The above materials have excellent mechanical properties, transparency and heat resistance, and as the main substrate layer 10 in the projection screen, they provide strength and stability while maintaining the transparency of the material; and can also achieve the effect of multiple materials to choose from, thereby achieving the effect of flexible use.

[0044] Furthermore, the substrate layer 10 is formed of a light-transmitting material or an opaque material. The desired substrate layer 10 can be selected according to the actual use requirements. For example, light-transmitting materials include but are not limited to: polyester film (PET), PET film has good optical transparency and mechanical strength, and is suitable as the substrate layer 10. Polycarbonate (PC), PC material has excellent heat resistance and impact resistance, and is also commonly used in applications that require light transmittance. Polymethyl methacrylate (PMMA): PMMA is a common organic glass with good light transmittance and is widely used in the optical field.

[0045] The substrate layer 10 of the opaque material includes but is not limited to: polyvinyl chloride (PVC): PVC material has good flexibility and barrier properties and is often used to manufacture opaque curtain substrates. polypropylene (PP): PP material is also used in some applications that require opaque properties.

[0046] Furthermore, a black light absorbing layer is coated on the side of the substrate layer 10 away from the grating prism structure layer 20, so as to enhance the light absorbing performance and contrast of the screen.

[0047] The grating prism structure layer 20 is arranged in an array on one side of the substrate layer 10. By arranging the grating prism structure layer 20 in an array on one side of the substrate layer 10, good optical performance can be obtained, thereby ensuring that the projection screen is in a good use state.

[0048] The reflective particles 30 are evenly arranged in the grating prism structure layer 20 . By evenly distributing a number of reflective particles 30 in the grating prism structure layer 20 , a uniform reflective effect can be achieved.

[0049] The light absorbing particles 40 are disposed in the grating prism structure layer 20 . By disposing the light absorbing particles 40 in the grating prism structure layer 20 , a good light absorbing effect can be achieved.

[0050] In the present application, the microbeads of the light-absorbing material contain particles that can move relative to each other under heat conduction, magnetic field, or electric field, while the reflective material has no effect on heat conduction, magnetic field, and electric field, thereby being able to control the light-absorbing material and the reflective material to be in the desired position.

[0051] The light-absorbing particles 40 are located on a side away from the substrate layer 10 and are gathered on a surface of one side of the grating prism structure layer 20; or, the light-absorbing particles 40 are located on a side away from the substrate layer 10 and are gathered on the other side of the grating prism structure layer 20, so that the projection screen has both light-absorbing and light-reflecting functions.

[0052] Specifically, by locating the light absorbing particles 40 away from the substrate layer 10 and gathering on one side surface of the grating prism structure layer 20, it is possible to achieve a good light absorbing effect on one side surface; or, the light absorbing particles 40 are located away from the substrate layer 10 and gathered on the other side surface of the grating prism structure layer 20, that is, the light absorbing particles 40 are arranged on the other side surface of the grating prism structure layer 20;

[0053] Of course, one side surface may be the upper side surface, and the other side surface may be the lower side surface, and vice versa.

[0054] By arranging a plurality of light-absorbing particles 40 at designated positions on the upper side or the lower side of the grating prism structure layer 20, it is possible to achieve a good light-absorbing effect on one side of the grating prism structure layer 20, thereby ensuring a good use effect of the projection screen. At the same time, since a plurality of light-reflecting particles 30 are evenly distributed in the grating prism structure layer 20, the function of absorbing light on one side of the grating prism structure layer 20 and reflecting light on the other side is achieved, thereby achieving the anti-ambient light effect of the black grid screen, allowing users to obtain a good viewing effect when using a projector during the day or when there is strong ambient light interference.

[0055] Furthermore, the length of the upper side of the grating prism structure layer 20 is shorter than the length of the lower side thereof or the length of the upper side of the grating prism structure layer 20 is longer than the length of the lower side thereof. This can achieve the effect of multiple shapes being available for selection, thereby being able to meet the effect of multiple usage requirements.

[0056] The utility model produces a projection screen by one-time molding. One side of the microstructure absorbs ambient light and the other side reflects ambient light. The overall anti-ambient light effect is good, the visual effect is good, no alignment and compounding are required, the cost is low, the precision is high, and it is suitable for mass production.

[0057] From the above description, it can be seen that the present application achieves the following technical effects:

[0058] In the embodiment of the present application, the light-absorbing particles 40 and the light-reflecting particles 30 are preset, and the light-absorbing particles 40 are located on the side away from the substrate layer 10 and gathered on one side surface of the grating prism structure layer 20; or, the light-absorbing particles 40 are located on the side away from the substrate layer 10 and gathered on the other side surface of the grating prism structure layer 20, so that the projection screen has both light-absorbing and light-reflecting functions, and the purpose of the upper and lower sides of the grating prism structure layer 20 being able to absorb and reflect light respectively is achieved, thereby achieving the technical effect of the projection screen resisting ambient light, thereby solving the technical problems in the prior art that the black grid screen still has complex alignment and bonding, requires micron-level precise alignment, and the alignment deviation leads to poor mass production consistency and thus poor visual effects. In addition, due to multiple composite processes, the production cost is high.

[0059] Further, the light absorbing particles 40 are dark metal or metal oxide micron or nanometer magnetic microbeads. It is understood that the light absorbing particles 40 are also light absorbing particles, which refer to micron or nanometer particles that can effectively absorb light energy, and the particles are usually composed of dark metal or metal oxide and have magnetism.

[0060] It is important to know that dark metals or metal oxides: have high light absorption capacity and can effectively absorb visible light, ultraviolet light or infrared light.

[0061] For example: Iron oxide (such as Fe3O4, Fe2O3): Common black or dark brown magnetic materials, widely used in magnetic particles. Cobalt oxide (such as CoO, Co3O4): Dark magnetic materials with good light absorption properties.

[0062] Micron or nanometer size: Small particle size provides a large specific surface area, enhancing light absorption and reaction efficiency.

[0063] Magnetic properties: Particles are magnetic and can be manipulated in a directional manner using a magnetic field, making them easier to handle in a variety of applications.

[0064] Furthermore, the reflective particles 30 are one or more of silver paste, glass beads, and titanium oxide. It is understood that silver paste has extremely high reflectivity, especially for visible light and infrared light; glass beads reflect and refract light through their spherical surface, improving the brightness and visibility of the material; titanium oxide also has a very high refractive index, making it an excellent white pigment with high hiding power and brightness. By using the above materials as reflective particles 30, it can ensure that the projection screen has a good reflective effect.

[0065] Furthermore, the grating prism structure layer 20 is a non-isosceles prism microstructure. It is understandable that by adopting a non-isosceles prism microstructure, it is possible to absorb the sunlight coming in from the window or the light coming down from the roof, while also being able to cooperate with the human eye's observation angle. Of course, in a specific usage scenario, the grating prism structure layer 20 can also be an isosceles structure.

[0066] Furthermore, the cross section of the grating prism structure layer 20 has at least two surfaces. It can be understood that a good optical processing effect can be ensured.

[0067] Furthermore, the cross section is a semicircular or approximately tangent surface. It can be understood that good light control and guiding effects can be achieved.

[0068] Furthermore, the bottom length of the cross section is 5-5000 μm, and the height is 0.05-1 times of the bottom length. It can be understood that a good molding effect can be ensured, and at the same time, a basis for providing good optical performance can be provided. In addition, by selecting the cross-sectional size within the above range, the effect of flexible selection of multiple sizes can be achieved, thereby being able to adapt to the effects of various usage occasions.

[0069] Furthermore, the light absorbing particles 40 are spherical or columnar in shape, and have a size range of 10-10000 nm. It is understood that the light absorbing particles 40 refer to micrometer or nanometer-sized particles that can effectively absorb light energy;

[0070] Spherical light-absorbing particles 40: have a uniform surface area and high light absorption efficiency; have isotropic absorption characteristics in the optical system; are relatively simple to prepare and disperse, and are easy to achieve uniform distribution.

[0071] Columnar light-absorbing particles 40: have a large specific surface area and light absorption characteristics in a specific direction; can enhance light absorption and scattering, and are suitable for specific optical applications.

[0072] The size of the light absorbing particles 40 is set at the nanometer level (10-1000 nm): at the nanometer scale, the light absorbing particles 40 have quantum effects and surface effects, and the light absorption efficiency is significantly improved.

[0073] Micron size (1000-10000nm): Micron-sized particles have a larger volume and surface area and can absorb more light energy.

[0074] The present application also relates to a method for preparing a projection screen, comprising the following steps:

[0075] Step 1: preparing a mold having a grating prism structure;

[0076] Step 2: Obtain light-absorbing material and light-reflecting material; wherein the light-absorbing material is black or similar color metal or metal oxide micrometer or nanometer magnetic microbeads; the light-reflecting material is one or more of silver paste, glass microbeads, and titanium oxide;

[0077] Step 3: Fully stir and evenly mix the light-curing material with the light-absorbing material and the light-reflecting material in a preset ratio to obtain a light-curing coating mixture for embossing the projection screen microstructure;

[0078] Step 4: coating the photocurable coating mixture on the substrate layer 10;

[0079] Step 5: Use the mold prefabricated in step 1 to emboss the photocurable coating mixture on the substrate layer 10 to form a grating prism structure; at the same time, Figure 7 As shown, heat, electricity or magnetism is used to apply heat conduction, electric field or magnetic field force on one side or both sides of the mold and the substrate layer 10 according to preset requirements, so as to directionally move the light absorbing material to a preset side surface of the grating prism structure;

[0080] Step 6: After the imprinting and heat conduction, electric field or magnetic field force is applied, and before the mold is released, the photocurable adhesive is cured by heating, ultraviolet light or electron beam curing to obtain the desired shape of the grating prism structure layer 20, and the light-absorbing material and the light-reflecting material in the photocurable adhesive are fixed at the designated position in the grating prism structure;

[0081] Step 7: Separate the mold from the light-curing adhesive to obtain a black grid curtain.

[0082] Specifically, step 1, mold preparation: using one or more of laser, photolithography or precision lathe processing to manufacture a grating structure mold, the so-called grating structure is a non-isosceles prism microstructure used in general projection screens;

[0083] Step 2: Obtain light-absorbing materials: black or similar colored metal or metal oxide micron or nanometer-scale magnetic microbeads, such as iron oxide or ferroferric oxide microbeads; these microbeads can react under the action of heat conduction, electric field, or magnetic field, and can move in the direction of the action;

[0084] Reflective material: one or more of silver paste, glass beads, titanium oxide, etc.

[0085] Step 3: Fully stir and evenly mix the light-curing material (UV glue) with a certain proportion of light-absorbing material and light-reflecting material to obtain a light-curing coating mixture for embossing the microstructure of the projection screen.

[0086] Step 4: coating: coating the photocurable coating mixture on the substrate layer 10;

[0087] Step 5: Grating imprinting: Use the mold prepared in step 1 to imprint the photocurable coating mixture on the substrate layer 10 into a grating prism structure; at the same time, use heat, electricity, magnetism or other methods to apply heat conduction, electric field, magnetic field or other forces on one or both sides of the mold and the substrate according to design requirements to move the light-absorbing material to the side surface required by the design of the grating structure;

[0088] Step 6, curing and molding: After the imprinting and heat conduction, or electric field, magnetic field and other forces are applied, but before the mold is released, the photocuring glue is cured by heating, ultraviolet light or electron beam curing to obtain the designed grating structure shape. At the same time, the light-absorbing material and the light-reflecting material in the photocuring glue are fixed at different positions in the grating structure. The light-absorbing material is fixed on the designed side surface, and the light-reflecting material is evenly dispersed inside the main body of the grating structure;

[0089] Step 7: Finished product: Separate the mold from the light-curing adhesive to obtain the black grid curtain; and perform subsequent processing such as lamination, backing adhesive or cutting according to the needs of the usage scenario.

[0090] Furthermore, the components of the photocurable coating mixture include: 50%-70% by weight of acrylic monomer, 10%-50% by weight of iron oxide microbeads, 5%-20% by weight of reflective material, 1-5% by weight of photoinitiator, and 0.1%-1% by weight of leveling and lubricating agent; wherein the reflective material is glass microbeads, titanium oxide or silver paste.

[0091] Specifically, the formulation components include: acrylic monomer: 50%-70% by weight, as a matrix material, providing a photocuring basis for the coating.

[0092] Common types: methyl methacrylate (MMA), butyl acrylate (BA), methacrylic acid (MAA), etc.

[0093] Iron oxide microbeads: 10%-50% by weight, as light absorbing material, providing light absorption function. Micrometer or nanometer iron oxide (such as Fe2O3 or Fe3O4) microbeads can move under the action of heat conduction, electric field or magnetic field.

[0094] Reflective material: 5%-20% by weight, improves the reflective performance of the coating and enhances the reflective effect.

[0095] Common types: silver paste, glass beads, titanium oxide.

[0096] Photoinitiator: 1%-5% by weight, initiates polymerization reaction under ultraviolet light, and quickly cures acrylic monomer.

[0097] Common types: 2-hydroxy-2-methyl-1-phenyl-1-propanone (HMPP), benzophenone (BP), etc.

[0098] Leveling and lubricating agent: 0.1%-1% by weight, improves the leveling of the coating and the surface quality of the coating film, and reduces surface defects.

[0099] Common types: polydimethylsiloxane (PDMS), fluorinated surfactants, etc.

[0100] The specific preparation steps include:

[0101] 1. Preparation: Make sure all raw materials are ready and the mixing containers and stirring equipment are clean.

[0102] 2. Addition of acrylic acid monomer: Pour the required amount of acrylic acid monomer (50%-70% by weight) into a mixing container.

[0103] 3. Add photoinitiator: Add photoinitiator according to the formula ratio (1%-5% by weight) and stir evenly.

[0104] 4. Add leveling and lubricating agent: Add leveling and lubricating agent according to the formula ratio (0.1%-1% by weight) and continue stirring until uniform.

[0105] 5. Add iron oxide microbeads: gradually add iron oxide microbeads according to the formula ratio (10%-50% by weight). After each addition, stir thoroughly to ensure uniform dispersion.

[0106] 6. Add reflective materials: gradually add reflective materials (such as silver paste, glass beads, titanium oxide) according to the formula ratio (5%-20% by weight). After each addition, stir thoroughly to ensure uniform dispersion.

[0107] 7. Mix well: Continue to stir the entire mixture to ensure that all components are evenly dispersed to form a uniform light-curing coating mixture.

[0108] The specific examples are further described below:

[0109] Example 1

[0110] A grating prism structure layer 20 is arranged on the substrate layer 10, and a plurality of light-absorbing particles 40 are arranged in the grating prism structure layer 20; wherein the light-absorbing particles 40 are nanomagnetic beads with a diameter of 100 nm, and magnets are arranged on both sides of the substrate layer 10, and a magnetic field strength of 0.01 T is used to direct the movement of the light-absorbing particles 40.

[0111] At this time, after testing, the projection screen results are: having good anti-light effect.

[0112] Example 2

[0113] The difference between Example 2 and Example 1 is that the magnetic field strength used is 1T.

[0114] At this time, after testing, the projection screen results are: it has a very good anti-light effect.

[0115] Example 3

[0116] The difference between Example 3 and Example 1 is that the diameter of the nanomagnetic beads is 1000 nm and the magnetic field strength is 1 T.

[0117] At this time, after testing, the projection screen results are: having good anti-light effect.

[0118] Example 4

[0119] The difference between Example 4 and Example 1 is that the diameter of the nanomagnetic beads is 5000 nm and the magnetic field strength is 2T.

[0120] At this time, after testing, the projection screen results are: having good anti-light effect.

[0121] Example 5

[0122] The difference between Example 5 and Example 1 is that the diameter of the nanomagnetic beads is 10000 nm, and the magnetic field strength used is 3T.

[0123] At this time, after testing, the projection screen results are: having a general anti-light effect.

[0124] Example 6

[0125] The difference between Example 6 and Example 1 is that the diameter of the nanomagnetic beads is 10 nm and the magnetic field strength is 0.001 T.

[0126] At this time, after testing, the projection screen results are: having good anti-light effect.

[0127] Comparative Example 1

[0128] The difference between Comparative Example 1 and Example 1 is that no nanomagnetic beads are added.

[0129] At this time, after testing, the projection screen result was: no anti-light effect.

[0130] Comparative Example 2

[0131] The difference between Comparative Example 2 and Example 1 is that the diameter of the nanomagnetic beads is 500 nm and no magnetic field strength is applied.

[0132] At this time, after testing, the projection screen result was: no anti-light effect.

[0133] Table 1

[0134]

[0135] From the above test results we can see that:

[0136] By adding nanomagnetic beads of different diameters and applying corresponding magnetic field strengths, the projection screen can have different degrees of anti-light effects.

[0137] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings; however, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A projection screen, characterized in that: include: A substrate layer (10); A grating prism structure layer (20), the array of which is arranged on one side of the substrate layer (10); Reflective particles (30) are evenly arranged in the grating prism structure layer (20); and Light-absorbing particles (40) are disposed in the grating prism structure layer (20); The light-absorbing particles (40) are located on a side away from the substrate layer (10) and are gathered on a surface of one side of the grating prism structure layer (20); or, the light-absorbing particles (40) are located on a side away from the substrate layer (10) and are gathered on a surface of another side opposite to the grating prism structure layer (20), so that the projection screen has both light-absorbing and light-reflecting functions.

2. The projection screen according to claim 1, characterized in that: The light-absorbing particles (40) are micrometer- or nanometer-scale magnetic microbeads of dark metal or metal oxide.

3. The projection screen according to claim 1, characterized in that: The substrate layer (10) is one or more of a PET film, a PVC film, an EVA film, a TPU film, a PU film, a PP film, a PMMA film, a PC film or a PS film.

4. The projection screen according to claim 1, characterized in that: The reflective particles (30) are one of silver paste, glass microbeads and titanium oxide.

5. The projection screen according to claim 1, characterized in that: The cross section of the grating prism structure layer (20) has at least two surfaces.

6. The projection screen according to claim 5, characterized in that: The cross section is a semicircular surface or an approximately tangent surface.

7. The projection screen according to claim 5, characterized in that: The bottom length of the cross section is 5-5000 μm, and the height is 0.05-1 times of the bottom length.

8. The projection screen according to claim 7, characterized in that: The light absorbing particles (40) are spherical or columnar in shape, and have a size range of 10-10000 nm.

Images