CN218825136U - Projection screen and projection arrangement can curl - Google Patents

Abstract

The application discloses projection screen and projection arrangement can curl relates to projection display technical field for solve the problem that the surface is crooked and the unevenness appears after current projection screen curls and expandes easily. The rollable projection screen includes an optical film, a flexible support layer, and an adhesive layer. The optical film is used for reflecting light and displaying a projection picture. The flexible supporting layer is arranged on one side of the optical membrane in a laminated mode. The adhesive layer is located between the optical film and the flexible support layer. One side of the bonding layer is bonded with the optical film, and the other side of the bonding layer is bonded with the flexible supporting layer. The optical membrane and the flexible supporting layer are bonded through the bonding layer, and the bonding layer is a glue bonding layer. The rollable projection screen is used for displaying a projection picture.

Description

Projection screen and projection arrangement can curl

Technical Field

The application relates to the technical field of projection display, in particular to a projection screen capable of being curled and a projection device.

Background

In the field of projection display technology, projectors are commonly used in conjunction with projection screens. The light emitted by the projector is projected onto the projection screen, and reaches the eyes of the audience after being reflected by the projection screen, so that the audience can watch the image formed by the light on the surface of the projection screen.

To facilitate transport of the projection screen, the projection screen may be made of a flexible material, including an optical film, an adhesive layer, and a support layer. The optical film and the supporting layer are bonded by an adhesive layer.

Currently, the adhesive layer is typically a pressure sensitive adhesive tape or a foam tape. After the projection screen is rolled and then unfolded, the adhesive layer can be deformed irreversibly, so that the projection screen is easy to have the problems of surface bending and unevenness.

SUMMERY OF THE UTILITY MODEL

The application provides a projection screen and projection arrangement can curl for solve the problem that the surface is crooked and the unevenness appears after current projection screen curls and redeployes easily.

In order to achieve the purpose, the technical scheme is as follows:

in one aspect, embodiments of the present application provide a rollable projection screen including an optical film, a flexible support layer, and an adhesive layer. The optical film is used for reflecting light and displaying a projection picture. The flexible supporting layer is arranged on one side of the optical membrane in a laminated mode. The adhesive layer is located between the optical film and the flexible support layer. One side of the bonding layer is bonded with the optical film, and the other side of the bonding layer is bonded with the flexible supporting layer. The optical membrane and the flexible supporting layer are bonded through the bonding layer, and the bonding layer is a glue bonding layer.

The utility model provides a projection screen that can curl, optics diaphragm and flexible supporting layer pass through the adhesive linkage and bond, and the adhesive linkage is the glue adhesive linkage. Therefore, the bonded optical membrane, the bonding layer and the flexible supporting layer can form a whole, slippage cannot occur, the glue bonding layer has high self-recovery capability after being cured, and the glue bonding layer can be recovered to a state before curling. Therefore, after the projection screen capable of being curled is curled and then unfolded, the projection screen capable of being curled is not easy to be in a bending state, and the surface can be kept flat.

In some embodiments, the adhesive layer has a thickness of 50um to 200um.

In some embodiments, the perpendicular projection of the optical film onto the flexible support layer in a direction perpendicular to the plane of the optical film is located inside or completely coincident with the flexible support layer. The side of the adhesive layer is flush with the side of the optical film.

In some embodiments, the adhesive layer is one of a polyether polyester adhesive layer, a polyurethane adhesive layer, an epoxy adhesive layer, an acrylic adhesive layer, or a silicone adhesive layer.

In some embodiments, the rollable projection screen further includes a first coating. The first coating is positioned between the bonding layer and the optical film and coated on the surface of the optical film on the side close to the bonding layer. The first coating is one of a polyester polyether coating, a polyurethane coating, an epoxy resin coating, an acrylic coating or a silicone coating.

In some embodiments, the rollable projection screen further includes a second coating. The second coating is positioned between the bonding layer and the flexible supporting layer and coated on the surface of one side, close to the bonding layer, of the flexible supporting layer. The second coating is one of polyester polyether coating, polyurethane coating, epoxy resin coating, acrylic coating or organic silicon coating.

In some embodiments, the first coating has a thickness of 1um to 10um.

In some embodiments, the second coating has a thickness of 1um to 10um.

In some embodiments, the optical film may include a fresnel lens layer, a surface layer, and a reflective layer. The surface of the Fresnel lens layer close to one side of the flexible supporting layer is provided with Fresnel microstructures. The superficial layer is range upon range of and is set up in fresnel lens layer and keep away from flexible supporting layer one side. The reflection layer is stacked on one side, close to the flexible supporting layer, of the Fresnel lens layer. The surface of the reflecting layer, which is far away from the Fresnel lens layer, is bonded with the bonding layer.

In another aspect, embodiments of the present application provide a projection device, including a projector and any one of the above-mentioned rollable projection screens. The projector is positioned on one side of the optical film of the rollable projection screen and used for emitting projection light rays towards the optical film so as to enable the optical film to display a projection picture.

Because the projection device provided by the embodiment of the application comprises any one of the rollable projection screens, the technical problem the same as that of the rollable projection screen can be solved, the same technical effect is achieved, and the details are not repeated herein.

Drawings

Fig. 1 is a schematic view of an overall structure of a projection screen according to the related art;

FIG. 2 is a schematic diagram of the overall structure of the projection screen after it is rolled and then unrolled;

fig. 3 is a schematic view illustrating a usage state of a projection apparatus according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a rollable projection screen according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of an overall structure of a rollable projection screen according to an embodiment of the present disclosure after being rolled and then unrolled;

FIG. 6 is a schematic diagram of another rollable projection screen according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram illustrating an overall structure of an optical film of a rollable projection screen according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of a fresnel lens layer according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a reflective layer provided in an embodiment of the present application;

fig. 10 is a schematic structural diagram of another reflective layer provided in an embodiment of the present application.

Reference numerals:

010-a projection screen; 011-an optical film; 012-an adhesive layer; 013-a support layer;

100-a projection device; 1-a rollable projection screen; 10-an optical film; 11-a surface layer; 111-a microlens; 12-a fresnel lens layer; 121-fresnel microstructure; 13-a reflective layer; 14-a coloured layer; 15-a diffusion layer; 16-diffusing particles; 20-a flexible support layer; 30-an adhesive layer; 40-a first coating; 50-a second coating; 2-a projector; 21-incident light; 22-outgoing rays; 3-audience members.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms, "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "center", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application.

In the embodiments of the present application, the terms "include", "include" or any other variations are intended to cover non-exclusive inclusions, so that a process, a method, an article, or an apparatus including a series of elements includes not only those elements but also other elements not explicitly listed, or further includes elements inherent to such a process, a method, an article, or an apparatus. Without further limitation, an element defined by the phrases "comprising a component of' 8230; \8230;" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element.

In the embodiments of the present application, the words "exemplary" or "such as" are used herein to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "such as" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present relevant concepts in a concrete fashion.

In the related art, as shown in fig. 1, fig. 1 is a schematic diagram of an overall structure of a projection screen 010 in the related art. Projection screen 010 may include an optical film 011, an adhesive layer 012, and a support layer 013. The optical film sheet 011 and the support layer 013 are bonded together by the adhesive layer 012.

At present, the adhesive layer 012 is generally a pressure sensitive adhesive tape or a double-sided foam adhesive, and the optical film 011, the adhesive layer 012 and the support layer 013 form a three-layer independent structure. As shown in fig. 1, after the projection screen 010 is curled, the deformation amounts are different due to different curling degrees of the three. The adhesive layer 012 is irreversibly deformed by a force, so that the adhesive layer 012 is rolled and then unfolded, and then slip occurs between the optical film 011 and the support layer 013.

Accordingly, as shown in fig. 2, fig. 2 is a schematic view of the overall structure of the projection screen 010 after being rolled and then unfolded, the projection screen 010 is easily bent after being rolled and then unfolded, both sides of the projection screen 010 are easily warped, and the surface of the projection screen 010 is uneven.

Based on this, the present application provides a projection apparatus 100, and referring to fig. 3, fig. 3 is a schematic view of a usage state of the projection apparatus 100 provided in the present application, and the projection apparatus 100 may include a rollable projection screen 1 and a projector 2. In use of projection device 100, projector 2 may be positioned under and in front of rollable projection screen 1, and audience 3 may be positioned in front of rollable projection screen 1 and looking at rollable projection screen 1. Incident light 21 emitted by the projector 2 is irradiated to the rollable projection screen 1, and the incident light 21 is reflected by the rollable projection screen 1 to finally form emergent light 22 to be irradiated to the audience 3, and images are formed in the rollable projection screen 1.

The projector 2 shown in fig. 3 may include a laser, which may be one of a monochromatic laser, a dichroic laser, and a three-color laser. The three-color laser can emit blue laser, red laser and green laser. The wavelength of blue laser light emitted from the laser may be set to 430nm-460nm, the wavelength of green laser light emitted from the laser may be set to 500nm-540nm, and the wavelength of red laser light emitted from the laser may be set to 610nm-650nm. Of course, the projector 2 may be a projector 2 that emits normal light.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a rollable projection screen 1 according to an embodiment of the present disclosure, where the rollable projection screen 1 may include an optical film 10, a flexible supporting layer 20, and an adhesive layer 30. The optical film 10 is used to reflect light and display a projection screen.

With continued reference to fig. 4, a flexible support layer 20 is laminated to one side of the optical film 10. An adhesive layer 30 is located between the optical film 10 and the flexible support layer 20. One side of the adhesive layer 30 is adhered to the optical film 10, and the other side of the optical film 10 is adhered to the flexible support layer 20. The optical film 10 and the flexible support layer 20 are bonded by an adhesive layer 30, and the adhesive layer 30 is a glue adhesive layer.

In the rollable projection screen 1 provided in the embodiment of the present application, the optical film 10 and the flexible supporting layer 20 are bonded by the bonding layer 30, and the bonding layer 30 is a glue bonding layer. Therefore, the bonded optical film 10, the bonding layer 30 and the flexible supporting layer 20 can form a whole without slippage, and the cured glue bonding layer has high self-recovery capability and can recover to the state before curling. Thus, as shown in fig. 5, fig. 5 is a schematic view of the whole structure of the rollable projection screen 1 provided in the embodiment of the present application after being rolled and then unrolled, after the rollable projection screen 1 is rolled and then unrolled, the rollable projection screen 1 is not easy to be bent, and the surface can be kept flat.

Simultaneously, because the projection screen 1 that can curl that this application embodiment provided can curl, can roll up projection screen 1 that can curl in the transportation, reduce the transportation space, improve conveying efficiency, it is more convenient to transport.

In some embodiments, the thickness of the adhesive layer 30 may be 50um to 200um. When the thickness of the adhesive layer 30 is within the above range, the adhesive layer 30 has good adhesion, and adhesion between the optical film 10 and the flexible support layer 20 can be ensured. The thickness of the adhesive layer 30 can be selected according to actual conditions. Illustratively, the adhesive layer 30 may have a thickness of 50um, 100um, 150um, or 200um.

When the thickness of the adhesive layer 30 is too small, the amount of the adhesive layer 30 between the optical film 10 and the flexible support layer 20 is small, so that the adhesion between the two is not strong enough. When the thickness of the adhesive layer 30 is too large, the overall thickness of the rollable projection screen 1 increases, and the amount of the adhesive layer 30 used increases, resulting in excessive material consumption.

In some embodiments, as shown in fig. 4, the perpendicular projection of the optical film 10 onto the flexible support layer 20 along a direction perpendicular to the plane of the optical film 10 (i.e., up and down in fig. 4) is located inside the flexible support layer 20 or completely coincident with the flexible support layer 20. In this way, the size of the flexible support layer 20 is equal to or larger than the size of the optical film 10, so that the whole optical film 10 can be bonded to the surface of one side of the flexible support layer 20. Illustratively, as shown in fig. 4, the side edges of the flexible support layer 20 may be flush with the side edges of the optical film 10.

With continued reference to fig. 4, the side edges of the adhesive layer 30 may be flush with the side edges of the optical film 10. Therefore, the edge positions of the optical film 10 are all bonded with the flexible support layer 20 through the bonding layer 30, and after the rollable projection screen 1 is rolled and then unfolded, the edge positions of the optical film 10 are bonded with the flexible support layer 20, so that the edge of the optical film 10 is prevented from warping.

When the optical film 10 and the flexible supporting layer 20 are bonded, a roll coating or spray coating method may be adopted, in which a material of the bonding layer 30 is coated on the surface of the flexible supporting layer 20 or the optical film 10, then the surfaces of the flexible supporting layer 20 and the optical film 10 are bonded to each other, and finally the bonding layer 30 is cured to complete the bonding between the flexible supporting layer 20 and the optical film 10.

In some embodiments, the adhesive layer 30 may be one of a polyester polyether adhesive layer, a polyurethane adhesive layer, an epoxy adhesive layer, an acrylic adhesive layer, or a silicone adhesive layer. The glue bonding layers have good bonding performance, so that the optical film 10 and the flexible supporting layer 20 can be firmly bonded. Meanwhile, the glue bonding layers have good recovery capability after being cured, and can be recovered to a flat state, so that the flat of the curled projection screen 1 is ensured. Of course, the adhesive layer 30 may be other glue adhesive layers with better recovery capability.

Illustratively, the adhesive layer 30 may be a polyester polyether adhesive layer. The polyester-polyether bonding layer may be a bonding layer 30 formed of a polyester-polyether block copolymer or a polyether-polyester copolymer. The molecular chain of the copolymer has a rigid segment and a flexible segment. The rigidity section can guarantee the hardness and the deflection of adhesive linkage 30, and flexible section makes adhesive linkage 30 have better elasticity, takes place the reconversion that can be better after the deformation. The ratio of the rigid segment to the flexible segment in the molecular chain may be different, for example, the ratio of the rigid segment to the flexible segment may be 5: 5. 6:4 or 4:6.

further, the specific type of the above-mentioned copolymer can be selected according to the actual situation. Illustratively, the polyester-polyether bonding layer may be made of polybutylene terephthalate (PB T) and polytetramethylene glycol (PTMG) to form a PBT-PTMG bonding layer, or may be made of Thermoplastic polyurethane elastomer rubber (TPU) and polyethylene glycol (PEG) to form a TPU-PEG bonding layer, or may be a PBT-PEG bonding layer or a TPU-PTMG bonding layer.

In order to make the bonding between the bonding layer 30 and the optical film 10 stronger, in some embodiments, as shown in fig. 6, fig. 6 is a schematic structural diagram of another rollable projection screen 1 provided in the embodiments of the present application, and the rollable projection screen 1 may further include a first coating layer 40. The first coating layer 40 is located between the adhesive layer 30 and the optical film 10, and is coated on the surface of the optical film 10 close to the adhesive layer 30. The first coating 40 is one of a polyester polyether coating, a polyurethane coating, an epoxy coating, an acrylic coating, or a silicone coating.

Since the first coating layer 40 is coated on the optical film 10, it can be seen from the principle of similarity and compatibility that when the properties of the first coating layer 40 and the adhesive layer 30 are similar, the two layers can be better bonded together, so that the optical film 10 and the adhesive layer 30 can be more firmly bonded. Since the first coating 40 is one of a polyurethane coating, an epoxy coating, an acrylic coating, or a silicone coating. The material of the first coating layer 40 may be the same as the material of the adhesive layer 30, so that the adhesive layer 30 and the first coating layer 40 can be tightly bonded.

Depending on the type of adhesive layer 30 selected, the first coating layer 40 may be selected to be of a material composition having properties similar to those of the adhesive layer 30. Illustratively, the adhesive layer 30 is a polyurethane adhesive layer and the first coating 40 is a polyurethane coating. Alternatively, the adhesive layer 30 is an epoxy adhesive layer, and the first coating layer 40 is an epoxy coating layer. Thus, the same material is selected for the first coating layer 40 and the adhesive layer 30, so that the adhesive property between the two layers is better, and the adhesive layer 30 and the first coating layer 40 are ensured not to have chemical reaction.

It is understood that the first coating 40 may be formed in different ways. Illustratively, the first coating 40 may be formed by spraying. When the optical film 10 is bonded, the material of the first coating layer 40 may be sprayed on the surface of the optical film 10 to be bonded, so that the first coating layer 40 is formed on the surface of the optical film 10, and then the optical film may be bonded by the first coating layer 40.

In some embodiments, the thickness of the first coating 40 may be 1um to 10um. As described above, the first coating layer 40 is for better adhesion of the adhesive layer 30 to the optical film 10. Therefore, it is sufficient to coat a thin film on the surface of the optical film 10 so that the first coating layer 40 can cover the surface of the optical film 10. Therefore, the first coating layer 40 with a small thickness is selected to tightly bond the adhesive layer 30 and the optical film 10. Meanwhile, when the thickness of the first coating 40 is thin, the material of the first coating 40 can be saved, and the consumption of the material can be reduced. Illustratively, the thickness of the first coating 40 may be 1um, 5um, or 10um.

Similarly, as shown in fig. 6, in some embodiments, rollable projection screen 1 can also include a second coating 50. A second coating 50 is disposed between the adhesive layer 30 and the flexible support layer 20 and is applied to the surface of the flexible support layer 20 on the side adjacent to the adhesive layer 30. The second coating 50 is one of a polyester polyether coating, a polyurethane coating, an epoxy coating, an acrylic coating, or a silicone coating.

Similarly, the second coating 50 is coated on the flexible support layer 20, and the second coating 50 is one of a polyurethane coating, an epoxy coating, an acrylic coating, or a silicone coating. The material selected for the second coating layer 50 may be the same as the material of the adhesive layer 30. Thus, according to the principle of similar compatibility, the second coating layer 50 and the adhesive layer 30 can be tightly bonded, so that the bonding between the flexible support layer 20 and the adhesive layer 30 is more secure.

Likewise, the second coating layer 50 may be selected to have a material composition similar in nature to the adhesive layer 30, depending on the type of adhesive layer 30 selected. Illustratively, the adhesive layer 30 is a polyurethane adhesive layer, and the second coating layer 50 may also be a polyurethane coating layer. Alternatively, the adhesive layer 30 is an epoxy adhesive layer, and the second coating layer 50 is also an epoxy coating layer. Thus, the same material is selected for the second coating layer 50 and the adhesive layer 30, so that the adhesive property between the two layers is better, and the adhesive layer 30 and the second coating layer 50 are ensured not to have chemical reaction.

In some embodiments, the thickness of the second coating 50 can also be 1um to 10um. Similarly, the second coating 50 is provided to enable the adhesive layer 30 to adhere better to the flexible support layer 20. Therefore, it is sufficient to coat the surface of the flexible support layer 20 with a thin film so that the second coating layer 50 can cover the surface of the flexible support layer 20. Therefore, the second coating layer 50 with a smaller thickness is selected to tightly bond the adhesive layer 30 and the flexible support layer 20. Meanwhile, when the thickness of the second coating layer 50 is small, the effect of reducing the consumption of materials can be achieved. Illustratively, the thickness of the second coating 50 may also be 1um, 5um, or 10um.

It will be appreciated that the flexible support layer 20 and the adhesive layer 30 are bonded by the second coating 50. In this way, the material of the flexible support layer 20 can be selected to have flexibility regardless of the adhesion with the adhesive layer 30. Illustratively, the flexible support layer 20 may be a polyester support layer or a polyamide support layer.

It is to be understood that the thicknesses of the optical film sheet 10, the adhesive layer 30, and the flexible support layer 20 shown in fig. 4, and the thicknesses of the optical film sheet 10, the flexible support layer 20, the adhesive layer 30, the first coating layer 40, and the second coating layer 50 shown in fig. 6 are examples and do not represent the actual thicknesses of the respective layers.

Of course, in other embodiments, as shown in fig. 4, the optical film 10 may be directly bonded to the adhesive layer 30, that is, one side of the optical film 10 is directly bonded to the flexible support layer 20 through the adhesive layer 30. In order to make the adhesion performance better, the surface of the optical film 10 on the side close to the flexible support layer 20 may be a flat surface, and the flatness may be less than 50um. Thus, the surface of the optical film 10 is relatively flat, so that the adhesive layer 30 can be in better contact with the surface of the optical film 10, and the adhesive effect is improved.

Similarly, the flexible support layer 20 may be directly bonded to the adhesive layer 30, i.e., one side of the flexible support layer 20 is directly bonded by the adhesive layer 30. Similarly, for better adhesion, the surface of the flexible supporting layer 20 close to the optical film 10 may be a flat surface, and the flatness may be less than 50um. In this way, the adhesive layer 30 can better contact with the surface of the flexible supporting layer 20, and the adhesion effect is improved.

It is understood that the optical film 10 in the rollable projection screen 1 provided in the embodiments of the present application may have different structures, and the optical film 10 in the rollable projection screen 1 provided in the embodiments of the present application will be further described with reference to the drawings.

As shown in fig. 7, fig. 7 is a schematic view of an overall structure of an optical film 10 of a rollable projection screen 1 provided in an embodiment of the present application, where the optical film 10 may include a surface layer 11, a fresnel lens layer 12, and a reflective layer 13. The surface layer 11 is stacked on the fresnel lens layer 12 far from the flexible support layer 20, and the surface layer 11 can be used to protect the rollable projection screen 1.

The surface of the fresnel lens layer 12 on the side close to the flexible support layer 20 has fresnel microstructures 121. The reflective layer 13 is stacked on the fresnel lens layer 12 on the side closer to the flexible support layer 20. The surface of the reflective layer 13 on the side away from the fresnel lens layer 12 may be bonded to the adhesive layer 30.

The reflective layer 13 typically comprises a reflective material, which is typically mixed in an organic solvent to make the reflective layer 13. When the reflective layer 13 is directly bonded to the adhesive layer 30, the organic solvent of the reflective layer 13 may be the same as or similar to the material of the adhesive layer 30, so that the reflective layer 13 and the adhesive layer 30 can be well bonded together.

As shown in fig. 7, the projector 2 is located on one side of the rollable projection screen 1 where the optical film 10 is located, and is used for emitting projection light toward the optical film 10 so that the optical film 10 displays a projection picture.

Since optical film 10 includes fresnel lens layer 12, ambient light is reflected to a region not visible to the human eye when passing through fresnel microstructure 121, so that rollable projection screen 1 has a certain resistance to ambient light.

Meanwhile, the fresnel microstructure 121 can also play a role in converging light, so that the gain of the rollable projection screen 1 is higher. The viewer 3 can see an image with high brightness at a position facing the rollable projection screen 1. Of course, in other embodiments, the optical film 10 may not include the fresnel lens layer 12. In this case, the optical film 10 is a normal film, and the gain of the rollable projection screen 1 is relatively low.

In some embodiments, the fresnel microstructure 121 may be a circular arc fresnel microstructure, as shown in fig. 8, where fig. 8 is a schematic structural diagram of the fresnel lens layer 12 provided in this embodiment of the present application, and the fresnel microstructure 121 is a concentric circular arc.

As shown in fig. 8, the centers O of the multiple fresnel microstructures 121 may be located outside the fresnel lens layer 12, and in this case, the fresnel lens layer 12 is an eccentric fresnel lens. As shown in fig. 7, the cross section of the fresnel microstructure 121 is saw-toothed. Of course, in other embodiments, the fresnel microstructure 121 may also be a linear fresnel microstructure 121, that is, the fresnel microstructure 121 is an elongated strip.

To further improve the resistance of the optical film 10 to ambient light, in some embodiments, the optical film 10 may further include a colored layer 14, and the colored layer 14 may be located between the fresnel lens layer 12 and the surface layer 11, as shown in fig. 7. The colored layer 14 is added with a dark dye, and the dark dye can absorb external ambient light, thereby improving the contrast of the optical film 10. The dark color dye may be azo dye, phthalocyanine dye, or the like. The coloured layer 14 may be made of an Ultra Violet (UV) glue material.

To enlarge the viewing angle of the optical film 10, in some embodiments, as shown in fig. 7, the optical film 10 may further include a diffusion layer 15. The diffusion layer 15 may be located between the surface layer 11 and the fresnel lens layer 12. Diffusion particles 16 are distributed in the diffusion layer 15. Light entering the optical film 10 first passes through the diffusion layer 15 and is diffused in all directions by the diffusion particles 16.

The viewing angle of the optical film 10 is increased due to the diffusion of the light. Meanwhile, the coherence of the diffused light rays is weak, so that the interference degree of the light rays on the surface of the optical diaphragm 10 is reduced, and the severity of speckles appearing on the surface of the optical diaphragm 10 is further weakened. The material of the diffusion particles 16 may be Polymethyl Methacrylate (PMMA).

The diffusion layer 15 may be made of a flexible material, for example, the diffusion layer 15 may be made of a Polyethylene terephthalate (PET) material. The PET material is flexible, which in turn allows the diffusion layer 15 to be flexible and capable of being rolled. Of course, the diffuser layer 15 may be made of other flexible materials, for example, the diffuser layer 15 may be made of thermoplastic polyurethane elastomer (TPU) material, which has elasticity and can achieve curling. Alternatively, the diffusion layer 15 may also be made of a Styrenic Block Copol ymeters (SBC) flexible material.

Based on the optical film 10 shown in fig. 7, the diffusion layer 15 may serve as a substrate for making the fresnel lens layer 12. The fresnel lens layer 12 may be cured with UV glue, which makes the fresnel lens layer 12 rollable because of its elasticity. When preparation fresnel lens layer 12, with the coating of UV glue on diffusion layer 15's surface, then impress fresnel lens layer 12 with dedicated mould for fresnel lens layer 12 shaping, then reuse UV light source lamp solidifies UV glue, and the preparation on fresnel lens layer 12 can be accomplished in the drawing of patterns at last. Of course, in other embodiments, the fresnel lens layer 12 may be made of heat-cured glue.

In some embodiments, the surface of the surface layer 11 on the side away from the fresnel lens layer 12 is distributed with microlenses 111. By providing the microlenses 111, the viewing angle of the projection screen can be increased as well, while the effect of reducing the surface reflectivity is achieved. Among them, the shape of the microlens 111 may be a hemisphere.

As described above, the reflective layer 13 can reflect light. The reflective material in the reflective layer 13 may also be aluminum, silver, or a combination of silver and aluminum in order to achieve the reflective function of the reflective layer 13. For better reflection of light, different shapes of materials may be selected as the material of the reflective layer 13. Several different reflective layers 13 provided in the embodiments of the present application will be described below by taking an example of selecting aluminum as a reflective material, and referring to the drawings.

In some embodiments, as shown in fig. 9, fig. 9 is a schematic structural diagram of a reflective layer 13 provided in this embodiment of the present application, in order to improve the gain of the rollable projection screen 1, powdered aluminum powder may be selected and coated on the fresnel lens layer 12 by spray printing or evaporation. Therefore, because the powdered aluminum powder is finer and more delicate and has insignificant directivity, most of the light emitted by the projector can be reflected out of the projection screen directionally according to the arrangement of the microstructure of the fresnel lens layer 12, and the light cannot be reflected around randomly, so that the gain of the projection screen is higher.

Further, when aluminum particles are selected as the reflective material, the diameter of the aluminum particles may range from 5um to 20um. The aluminum particles within this range have a small diameter, and after the reflective layer 13 is formed, the aluminum particles form a dense reflective surface, and when light is irradiated on the reflective surface, the light can be reflected as much as possible, thereby avoiding waste of light energy. Meanwhile, when aluminum particles are selected as the reflective material, the reflective layer 13 can be made very thin, so that consumption of aluminum material can be reduced, and manufacturing cost can be saved.

In other embodiments, as shown in fig. 10, fig. 10 is a schematic structural diagram of another reflective layer 13 provided in the embodiments of the present application. When the reflective material of the reflective layer 13 is aluminum, a scaly aluminum powder may be selected. The scale-shaped aluminum powder is sprayed on the fresnel lens layer 12 by means of spray printing. The scaly aluminum powder has larger diameter-thickness ratio, so the aluminum has stronger binding capacity and is not easy to fall off. The ratio of the diameter to the thickness of the flaky aluminum powder may range from (40.

The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A rollable projection screen, comprising:

the optical film is used for reflecting light and displaying a projection picture;

the flexible supporting layer is arranged on one side of the optical membrane in a laminated mode; and the number of the first and second groups,

an adhesive layer between the optical film and the flexible support layer; one side of the bonding layer is bonded with the optical membrane, and the other side of the bonding layer is bonded with the flexible supporting layer; the optical membrane and the flexible supporting layer are bonded through the bonding layer, and the bonding layer is a glue bonding layer.

2. The rollable projection screen of claim 1, wherein the adhesive layer has a thickness of 50 to 200um.

3. A rollable projection screen according to claim 1, wherein the perpendicular projection of the optical film onto the flexible support layer is inside or completely coincident with the flexible support layer in a direction perpendicular to the plane of the optical film; the side edge of the bonding layer is flush with the side edge of the optical film.

4. The rollable projection screen of claim 1, wherein the adhesive layer is one of a polyester polyether adhesive layer, a polyurethane adhesive layer, an epoxy adhesive layer, an acrylic adhesive layer, or a silicone adhesive layer.

5. The rollable projection screen of claim 4, further comprising:

the first coating is positioned between the bonding layer and the optical film and coated on the surface of the optical film on one side close to the bonding layer; the first coating is one of a polyester polyether coating, a polyurethane coating, an epoxy resin coating, an acrylic adhesive coating or an organic silicon coating.

6. The rollable projection screen of claim 4, further comprising:

the second coating is positioned between the bonding layer and the flexible supporting layer and is coated on the surface of the flexible supporting layer close to one side of the bonding layer; the second coating is one of a polyester polyether coating, a polyurethane coating, an epoxy resin coating, an acrylic adhesive coating or an organic silicon coating.

7. A rollable projection screen according to claim 5, wherein the first coating has a thickness of 1-10 um.

8. A rollable projection screen according to claim 6, wherein the second coating has a thickness of 1-10 um.

9. A rollable projection screen according to any one of claims 1 to 8, wherein the optical film comprises:

the surface of one side, close to the flexible supporting layer, of the Fresnel lens layer is provided with a Fresnel microstructure;

the surface layer is arranged on one side, away from the flexible supporting layer, of the Fresnel lens layer in a laminated mode; and the number of the first and second groups,

the reflecting layer is arranged on one side, close to the flexible supporting layer, of the Fresnel lens layer in a laminated mode; and the surface of one side of the reflecting layer, which is far away from the Fresnel lens layer, is bonded with the bonding layer.

10. A projection device comprising a projector and a rollable projection screen according to any one of claims 1 to 9; the projector is located on one side where the optical film of the rollable projection screen is located and used for emitting projection light towards the optical film so that the optical film can display a projection picture.

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