CN219417977U - Curlable projection screen and projection device - Google Patents

Abstract

The application discloses but projection screen and projection arrangement curl relates to projection display technical field for solve current projection screen curl and expand the relatively poor problem of back roughness again. The rollable projection screen includes a plurality of functional layers. The multiple functional layers are stacked. Wherein the multi-layer functional layer comprises at least one shape memory functional layer. The shape memory functional layer has an initial shape, and the initial shape is a flat layered structure. The shape memory functional layer is used for curling to a temporary shape under external conditions and is also used for recovering to an original shape from the temporary shape under the action of the external conditions. The rollable projection screen is used to display a projection screen.

Description

Curlable projection screen and projection device

Technical Field

The present application relates to the field of projection display technologies, and in particular, to a rollable projection screen and a projection 5 device.

Background

In the field of projection display technology, projectors are commonly used with projection screens. The light emitted by the projector is projected onto the projection screen, and then reflected by the projection screen, reaches eyes of a viewer, and the viewer can observe an image formed by the light on the surface of the projection screen.

To ensure flatness of the projection screen, the projection screen may include an optical film and a support back plate,

the optical film is arranged on the supporting backboard, and the flatness of the projection screen is ensured through the supporting backboard. Meanwhile, in order to facilitate transportation of the projection screen, the optical film and the support back plate are made of a curled material. Therefore, in the transportation process, the projection screen can be curled, so that the transportation space is saved, and the transportation is more convenient.

However, after the existing support back plate is curled and then unfolded, the flatness is poor, so that the flatness of the optical film is poor, and the projection effect of the optical film is poor.

Disclosure of Invention

The application provides a crimpable projection screen and projection device for solve current projection screen crimp and expand the relatively poor problem of back roughness again.

In order to achieve the above purpose, the present application adopts the following technical scheme:

in one aspect, embodiments of the present application provide a rollable projection screen including a plurality of functional layers.

The multiple functional layers are stacked. Wherein the multi-layer functional layer comprises at least one shape memory functional layer.

The shape memory functional layer has an initial shape, and the initial shape is a flat layered structure. Shape memory function

The energy layer is used for curling to a temporary shape under external conditions and is also used for recovering from the temporary shape to an initial shape under the action of external conditions.

The application provides a rollable projection screen, including shape memory shape functional layer, in the transportation of rollable projection screen, can make shape memory functional layer to curl to temporary shape through applying certain external condition to shape memory functional layer to reduce rollable projection screen

The transportation space of curtain improves transportation efficiency, and the transportation is more convenient. At 0 hours of use of the rollable projection screen, the shape memory function layer can be restored to its original shape by applying certain external conditions to the shape memory function layer. Because the initial shape is a smooth layered structure, the problem of curling and warping does not exist, and the stacked multi-layer functional layers have better flatness, so that the whole curled projection screen has better flatness, the display effect of a projection picture is ensured, and the use experience of audiences is improved.

In some embodiments, the multi-layer functional layer further includes a reflective layer and a fresnel lens layer. The reflecting layer is used for reflecting light rays. The Fresnel lens layer is arranged on one side of the reflecting layer, and one side of the Fresnel lens layer, which is close to the reflecting layer, is provided with a Fresnel microstructure. The shape memory functional layer is positioned on one side of the reflecting layer far away from the Fresnel lens layer and is attached to the surface of one side of the reflecting layer far away from the Fresnel lens layer.

In some embodiments, the shape memory functional layer is annular. The shape memory functional layer is disposed around the periphery of the surface of the reflective layer on the side remote from the Fresnel lens layer.

In some embodiments, the thickness of the shape memory functional layer is 0.5mm to 2mm in a direction perpendicular to the surface of the fresnel lens layer on the side remote from the reflective layer.

In some embodiments, the multi-layer functional layer further includes a reflective layer and a fresnel lens layer. The reflecting layer is used for reflecting light rays. The Fresnel lens layer is arranged on one side of the reflecting layer, and one side of the Fresnel lens layer, which is close to the reflecting layer, is provided with a Fresnel microstructure. Wherein the shape memory functional layer is positioned on one side of the Fresnel lens layer away from the reflecting layer.

In some embodiments, the shape memory functional layer is a shape memory polymer functional layer.

In some embodiments, the shape memory polymer functional layer is one of a radiation crosslinked polyethylene functional layer, a polynorbornene functional layer, a trans-polyisoprene functional layer, a polyurethane functional layer, and a polyester functional layer.

In some embodiments, the shape memory polymer functional layer is a photoinduced shape memory polymer functional layer. The photopaper-ture memory polymer functional layer is used to enable the photopaper-ture memory polymer functional layer to curl to a temporary shape under light conditions and to enable the photopaper-ture memory polymer functional layer to revert to the original shape.

In some embodiments, the thickness of the shape memory functional layer is 50um to 150um in a direction perpendicular to the surface of the fresnel lens layer on the side remote from the reflective layer.

In another aspect, embodiments of the present application provide a projection device including a projector and any one of the above rollable projection screens.

Because the projection device provided in the embodiment of the present application includes any one of the above-mentioned rollable projection screens, the projection device can solve the same problem as the above-mentioned rollable projection screen, and achieve the same technical effects, and will not be described here again.

Drawings

Fig. 1 is a schematic view of a usage state of a projection device according to an embodiment of the present application;

FIG. 2 is a schematic diagram of the overall structure of a rollable projection screen according to an embodiment of the present disclosure;

FIG. 3 is a schematic view of the overall structure of another rollable projection screen according to an embodiment of the present application;

FIG. 4 is a schematic perspective view of a rollable projection screen according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of the overall structure of the rollable projection screen shown in FIG. 4 in a rolled state;

FIG. 6 is an enlarged view of a portion of the end of the rollable projection screen of FIG. 5;

FIG. 7 is a schematic perspective view of a side of a rollable projection screen with a support back plate according to an embodiment of the present disclosure;

FIG. 8 is a schematic perspective view of a side of a support back plate of another rollable projection screen according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a reflective layer according to an embodiment of the present disclosure;

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

Reference numerals:

100-projection means; 1-a rollable projection screen; 11-a functional layer; 12-a shape memory functional layer; 13-a reflective layer; 14-a fresnel lens layer; 141-fresnel microstructure; 15-a diffusion layer; 151-diffusing particles; 16-surface layer; 2-a projector; 20-an optical film; 21-incident light; 22-outgoing light; 3-audience; 30-supporting the back plate.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

In the description of the present application, it should 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 illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present application.

In the present embodiments, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In the technical field of projection display, especially in the technical field of ultra-short focal projection display, strict requirements are placed on the flatness of a projection screen. When the flatness of the projection screen is poor, the projection picture displayed on the projection screen can be obviously deformed, and the watching effect is affected.

Based on this, the embodiment of the present application provides a projection device, referring to fig. 1, fig. 1 is a schematic view of a usage state of a projection device 100 provided in the embodiment of the present application, where the projection device 100 may include a rollable projection screen 1 and a projector 2. The projector 2 is located at one side of the rollable projection screen 1 for projecting projection light toward the rollable projection screen 1.

As shown in fig. 1, in use of the projection device 100, the projector 2 may be placed under the front of the rollable projection screen 1 with the viewer 3 in front of the rollable projection screen 1 and looking at the rollable projection screen 1. The incident light ray 21 emitted from the projector 2 irradiates the rollable projection screen 1, and the incident light ray 21 is reflected by the rollable projection screen 1 to finally form an emergent light ray 22, which irradiates the audience 3, and is imaged in the rollable projection screen 1.

The projector 2 shown in fig. 1 may include a laser, which may be one of a single-color laser, a double-color laser, and a three-color laser. Wherein, the trichromatic laser can emit blue laser light, red laser light and green laser light. The wavelength range of the blue laser light emitted from the laser may be set to 430nm to 460nm, the wavelength range of the green laser light emitted may be set to 500nm to 540nm, and the wavelength range of the red laser light emitted may be set to 610nm to 650nm. Of course, the projector 2 may be the projector 2 that emits normal light.

The description of the rollable projection screen 1 provided in the embodiments of the present application follows. As shown in fig. 2, fig. 2 is a schematic diagram of the overall structure of a rollable projection screen 1 according to an embodiment of the present application, where the rollable projection screen 1 may include multiple functional layers 11. The plurality of functional layers 11 are stacked. Wherein the functional layers 11 may function differently, so that the rollable projection screen 1 has good performance.

The multi-functional layer 11 may include at least one shape memory functional layer 12. The shape memory functional layer 12 has an initial shape, and the initial shape is a flat layered structure. The shape memory functional layer 12 may be used to curl to a temporary shape under external conditions and may also be used to recover from the temporary shape to an original shape under external conditions.

In this way, in the process of transporting the rollable projection screen 1, the shape memory function layer 12 can be curled to a temporary shape by applying a certain external condition to the shape memory function layer 12, so that the transportation space of the rollable projection screen 1 is reduced, the transportation efficiency is improved, and the transportation is more convenient. When the rollable projection screen 1 is used, the shape memory function layer 12 can be restored to the original shape by applying certain external conditions to the shape memory function layer 12. Because the initial shape is a smooth layered structure, the problem of curling and warping does not exist, and the stacked multi-layer functional layer 11 has better flatness, so that the whole curled projection screen 1 has better flatness, the display effect of a projection picture is ensured, and the use experience of audiences is improved.

It will be appreciated that there are various external conditions applied to the shape memory functional layer 12, for example, when the shape memory functional layer 12 is required to be curled, the shape memory functional layer 12 may be deformed by electric, light, heat or the like, then curled and fixed to the temporary shape by external force, and then the external conditions are removed, so that the shape memory functional layer 12 can maintain the temporary shape.

When the shape memory function layer 12 is required to be restored to the original shape, conditions such as electricity, light, and heat are applied to the shape memory function layer 12 in the temporary shape so that the shape memory function layer 12 can be restored to the original shape.

To achieve a better projection effect, in some embodiments, with continued reference to fig. 2, the multi-layer functional layer 11 may further include a reflective layer 13 and a fresnel lens layer 14. The reflective layer 13 is for reflecting light. As shown in fig. 2, the light projected by the projector 2 reaches the reflective layer 13, and is reflected by the reflective layer 13 and is emitted to the viewer 3, so that the viewer 3 can view the picture on the rollable projection screen 1.

The fresnel lens layer 14 is located on one side of the reflective layer 13, and the surface of the fresnel lens layer 14 on the side close to the reflective layer 13 has a fresnel microstructure 141. As shown in fig. 2, the rollable projection screen 1 is in use with the fresnel lens layer 14 on the side of the reflective layer 13 adjacent the viewer 3.

Thus, as shown in fig. 2, the light projected by the projector 2 passes through the fresnel lens layer 14 and then reaches the reflective layer 13. When the external ambient light passes through the fresnel microstructure 141, a part of the light is reflected to an area that is not observed by human eyes, so that the rollable projection screen 1 has a certain resistance to the ambient light.

In addition, the fresnel microstructure 141 has the function of converging light, and after the light projected by the projector 2 is reflected by the reflecting layer 13, the light converges toward the center of the rollable projection screen 1, so that the image with higher brightness is watched by the viewer 3 at the position opposite to the rollable projection screen 1, and the gain of the rollable projection screen 1 is higher.

In some embodiments, with continued reference to fig. 2, the multi-layer functional layer 11 may also include a diffusion layer 15. The diffusion layer 15 may be located at a side of the fresnel lens layer 14 remote from the reflective layer 13, and diffusion particles 151 are distributed in the diffusion layer 15. After the light beam projected by the projector 2 passes through the diffusion particles 151 in the diffusion layer 15, the light beam is diffused in all directions by the diffusion particles 151. The viewing angle of the rollable projection screen 1 increases due to the diffusion of the light.

At the same time, the degree of interference of the light on the surface of the rollable projection screen 1 is reduced due to the diffusion of the light, and the severity of speckle on the surface of the rollable projection screen 1 is further reduced. The material of the diffusion particles 151 may be polymethyl methacrylate (Polymethyl Metha crylate, PMMA).

Further, with continued reference to fig. 2, the multi-layer functional layer 11 may also include a surface layer 16. The surface layer 16 may be located on the side of the fresnel lens layer 14 remote from the reflective layer 13. Surface layer 16 may be used to protect rollable projection screen 1. As shown in fig. 2, the surface layer 16 is the outermost layer of the multiple functional layers 11, and is directly in contact with the external environment, so that the surface layer 16 can protect the other functional layers 11 located on the inner side.

In some embodiments, as shown in fig. 3, fig. 3 is a schematic diagram illustrating an overall structure of another rollable projection screen 1 according to an embodiment of the present application, where the shape memory functional layer 12 may be located on a side of the reflective layer 13 away from the fresnel lens layer 14, and is attached to a surface of the reflective layer 13 on a side away from the fresnel lens layer 14. At this time, the shape memory functional layer 12 located on the side of the reflective layer 13 away from the fresnel lens layer 14 can serve as a supporting structure for supporting and fixing the functional layer 11 such as the reflective layer 13 and the fresnel lens layer 14.

Meanwhile, since the shape memory functional layer 12 is located at the side of the reflecting layer 13 far away from the fresnel lens layer 14, when light reaches the reflecting layer 13, the light is reflected by the reflecting layer 13 and re-emitted from the side of the fresnel lens layer 14, and the light does not pass through the shape memory functional layer 12, so that the influence of the shape memory functional layer 12 on the light projected by the projector 2 can be avoided.

When the shape memory function layer 12 is disposed on the side of the reflective layer 13 away from the fresnel lens layer 14, as shown in fig. 4, fig. 4 is a schematic perspective view of a rollable projection screen 1 according to an embodiment of the present application, the rollable projection screen 1 may be divided into two parts, namely an optical film 20 and a supporting back plate 30, and the optical film 20 is disposed on one side of the supporting back plate 30.

It is understood that the support back plate 30 is the shape memory functional layer 12 shown in fig. 3, and the optical film 20 is the remaining multi-layer functional layer 11 shown in fig. 3. In this way, when manufacturing the rollable projection screen 1, the support back plate 30 may be manufactured separately, and then the optical film 20 may be bonded to the support back plate 30 after the manufacturing is completed.

During transportation of the rollable projection screen 1, the supporting back plate 30 is allowed to be rolled by applying external conditions to the supporting back plate 30, thereby enabling the rollable projection screen 1 to be rolled up as a whole. At this time, as shown in fig. 5, fig. 5 is a schematic view of the whole structure of the rollable projection screen 1 shown in fig. 4 in a rolled state, and the rollable projection screen 1 can be rolled into a columnar structure as a whole, which occupies a smaller space and is more convenient to transport.

It will be appreciated that when rolled, the support backplate 30 may be rolled in a direction toward the optical film 20. Thus, as shown in fig. 6, fig. 6 is an enlarged view of a portion of the end of the rollable projection screen 1 of fig. 5, where the support back plate 30 can encapsulate the optical film 20 inside to avoid damage to the optical film 20 during shipping.

In some embodiments, the shape memory functional layer 12 may be annular, with the shape memory functional layer 12 disposed around the perimeter of the surface of the reflective layer 13 on the side remote from the fresnel lens layer 14. Fig. 7 is a schematic perspective view of a side of a support back plate 30 in a rollable projection screen 1 according to an embodiment of the present disclosure, where the support back plate 30 is disposed around a periphery of an optical film 20.

Because the periphery of the optical film 20 is attached to the support back plate 30, when the support back plate 30 is kept flat, the optical film 20 can be kept in a flat state, and the flatness is good. Meanwhile, since the support back plate 30 is provided only around the circumference of the optical film 20, the consumption of material can be reduced and the weight of the rollable projection screen 1 can be reduced.

Of course, the shape memory functional layer 12 may be a complete layered structure. As shown in fig. 8, fig. 8 is a schematic perspective view of a side of a support back plate 30 in another rollable projection screen 1 according to an embodiment of the present application, where the outer contour shape of the optical film 20 is rectangular, and the outer contour shape of the support back plate 30 may be rectangular.

In some embodiments, as shown in fig. 3, the sides of the shape memory functional layer 12 may be flush with the sides of the reflective layer 13. That is, as shown in fig. 3, both sides of the shape memory function layer 12 are flush with the sides of the reflection layer 13 in the up-down direction shown in fig. 3. In this way, the side edge of the shape memory functional layer 12 is attached to the side edge of the reflecting layer 13, so that the side edge of the rollable projection screen 1 is not warped, and the flatness of the rollable projection screen 1 is ensured.

In some embodiments, with continued reference to FIG. 3, the thickness of the shape memory functional layer 12 may be 0.5mm to 2mm in a direction perpendicular to the surface of the Fresnel lens layer 14 on the side remote from the reflective layer 13 (i.e., the left-right direction in FIG. 3). Illustratively, the thickness of the shape memory functional layer 12 may be 0.5mm, 1mm, 1.5mm, or 2mm, and may be specifically set according to practical situations, which are only examples herein.

When the thickness of the shape memory functional layer 12 is within the above range, the shape memory functional layer 12 can better play a supporting role, so that the other functional layers 11 can be kept flat, and the flatness of the rollable projection screen 1 is ensured. When the thickness of the shape memory functional layer 12 is thin, the shape memory functional layer 12 is easily deformed and lifted by the force of the other functional layers 11. When the thickness of the shape memory functional layer 12 is thicker, the weight of the shape memory functional layer 12 increases accordingly, so that the weight of the entire rollable projection screen 1 increases.

In other embodiments, as shown in FIG. 2, the shape memory functional layer 12 may also be located on the side of the Fresnel lens layer 14 remote from the reflective layer 13. At this time, the shape memory functional layer 12 may serve as a manufacturing substrate for the rollable projection screen 1. The shape memory functional layer 12 may be used as a base for the fabrication of the other functional layer 11 when fabricating the rollable projection screen 1, and the other functional layer 11 may be fabricated using the surface of the shape memory functional layer 12.

Taking the rollable projection screen 1 shown in fig. 2 as an example, the shape memory functional layer 12 shown in fig. 2 can be used as a fabrication substrate for fabricating the surface layer 16 and the diffusion layer 15. By way of example, surface layer 16 may be made of a UV gel material. In the process of manufacturing the surface layer 16, a UV glue may be coated on the surface of the shape memory function layer 12, and then the UV glue may be cured by using a UV light source lamp, thereby completing the manufacturing of the surface layer 16. Similarly, the diffusion layer 15 may be made of a UV glue material, and the manufacturing process thereof may refer to the manufacturing process of the surface layer 16, which is not further described herein.

As shown in fig. 2, since the shape memory functional layer 12 is located on the side of the fresnel lens layer 14 remote from the reflective layer 13, the shape memory functional layer 12 and the other functional layers 11 can together form the optical film 20 shown in fig. 4. Based on the solution shown in fig. 2, since the shape memory functional layer 12 can play a certain supporting role, so that the rollable projection screen 1 is kept flat, the rollable projection screen 1 may comprise only the optical film 20 shown in fig. 4.

Of course, in other embodiments, the number of the shape memory functional layers 12 may be plural. The side of the fresnel lens layer 14 remote from the reflective layer 13 and the side of the reflective layer 13 remote from the fresnel lens layer 14 are each provided with a shape memory functional layer 12. The shape memory functional layer 12 located on the side of the reflective layer 13 away from the fresnel lens layer 14 is the support back plate 30 shown in fig. 4.

As shown in fig. 2, when the fresnel lens layer 14 is provided with the shape memory function layer 12 on a side away from the reflective layer 13, light projected by the projector 2 passes through the shape memory function layer 12. Thus, to reduce the effect of the shape memory functional layer 12 on the light projected by the projector, in some embodiments, the shape memory functional layer 12 may be a shape memory polymer functional layer.

It is known that shape memory polymers have relatively good light transmission properties. Therefore, when the light projected by the projector 2 passes through the shape memory polymer functional layer, the light can better penetrate through the shape memory polymer functional layer, so that the light projected by the projector 2 can be reflected into human eyes, and the display effect of the curled projection screen 1 is ensured.

In addition, as shown in fig. 2, the shape memory polymer functional layer (i.e., the shape memory functional layer 12) is generally semitransparent, and when the external ambient light passes through the shape memory polymer functional layer, part of the ambient light can be absorbed by the shape memory polymer functional layer, so that the shape memory polymer functional layer can play a role in resisting the ambient light.

Referring to FIG. 3, when the shape memory functional layer 12 is disposed on the reflective layer 13 away from the Fresnel lens layer 1

4, since the light projected by the projector 2 does not pass through the shape memory function layer 12, the light will not be projected to the side

The light projected by the camera is affected. At this time, the shape memory functional layer 12 may be made of other materials. 5 for example, the material of the shape memory functional layer 12 may comprise a shape memory alloy, a shape memory ceramic, or a shape memory polymer, to form a shape memory alloy functional layer, a shape memory ceramic functional layer, or a shape memory polymer functional layer.

Based on the scheme shown in fig. 2, in some embodiments, the thickness of the shape memory functional layer 12 is 50um to 150um in a direction perpendicular to the surface of the fresnel lens layer 14 on the side away from the reflective layer 13. Exemplary, the shape memory functional layer 12 may have a thickness of 50um, 100um, or 15

0um. And may be specifically set according to practical situations, and is only used as an example herein.

As can be seen from the above, the shape memory function layer 12 has a certain influence on the light projected by the projector 2, and when the thickness of the shape memory function layer 12 is within the above range, the shape memory can be ensured

The functional layer 12 has a good supporting function, and the shape memory functional layer 12 can have a small influence on the light projected by the projector 5 2.

When the thickness of the shape memory functional layer 12 is thin, the shape memory functional layer 12 is relatively easy to deform under the action of the other functional layers 11. When the thickness of the shape memory functional layer 12 is large, the light projected by the projector 2 passes through the shape memory functional layer 12, and the shape memory functional layer 12 is likely to interfere with the light, thereby affecting the display effect.

In some embodiments, the material of the shape memory polymer functional layer includes at least one of radiation crosslinked polyethylene, polynorbornene, trans-polyisoprene, polyurethane, and polyester. The material has good shape memory property, can keep good flatness, is convenient to curl, reduces the transportation space of the curled projection screen 1, and improves the transportation efficiency. Shape memory polymers may also include other materials having shape memory properties.

Wherein the material of the shape memory polymer functional layer may include one or more of the above materials. Illustratively, in some embodiments, the shape memory functional layer may be one of a radiation crosslinked polyethylene functional layer, a polynorbornene functional layer, a trans-polyisoprene functional layer, a polyurethane functional layer, and a polyester functional layer, with the shape memory functional layer 12 being made of a single shape memory polymer.

Alternatively, the material of the shape memory polymer functional layer may include various shape memory polymers such as radiation crosslinked polyethylene and polynorbornene, and the various shape memory polymers are formed together into the shape memory functional layer 12.

In some embodiments, the shape memory polymer functional layer may be a photoinduced shape memory polymer functional layer. The photopaper-ture memory polymer functional layer is used to enable the photopaper-ture memory functional layer to curl to a temporary shape under light conditions and to enable the photopaper-ture memory polymer functional layer to revert to the original shape.

Wherein the polymer in the photopatterned polymer functional layer can have a photochromic group. 5 the photochromic group is used for changing the molecular chain state of the shape memory polymer under the illumination condition,

to enable the shape memory functional layer 12 to curl to a temporary shape and to enable the shape memory functional layer 12 to return to an original shape. Among them, the photochromic group possessed by the shape memory polymer may be determined according to the specific kind of the shape memory polymer, and for example, the photochromic group may be cinnamic acid, azobenzene, or the like.

It will be appreciated that the photochromic group in the shape memory polymer is capable of sensing light and absorbing energy from the light, and the photochromic group after absorbing energy may change the molecular chain state of the shape memory polymer, thereby enabling the shape memory functional layer 12 to curl or the shape memory functional layer 12 to return to the original shape.

It is to be understood that the type of light required to change the molecular chain state of the polymer 5 may be different depending on the type of photochromic group. When the shape memory functional layer 12 is irradiated, an appropriate light may be selected according to the actual situation to be irradiated.

Generally, the shape memory functional layer 12 may be irradiated with ultraviolet light or infrared rays. Alternatively, the shape memory functional layer 12 is irradiated with light of a specific wavelength.

Thus, the shape memory function layer 12 is curled by irradiating the shape memory function layer 12 with external light, and after the shape memory function layer 12 is curled by the external force, the external specific light environment is removed, so that the shape memory function layer 12 can be fixed in the temporary shape. When the rollable projection screen 1 is required to be used, only a certain external light is applied to the shape memory function layer 12, the shape memory function layer 12 can be restored to the original shape under the external light environment, and the flatness of the rollable projection screen 1 after being unfolded again is ensured.

Based on the above scheme, since the shape memory polymer has a photochromic group, the shape memory functional layer 12 can be curled or restored to the original shape by using light, and the shape memory polymer has the advantages of high efficiency, low energy consumption and convenience in remote control. Of course, the shape memory functional layer 12 may also be curled or restored to its original shape by other external conditions. For example, the shape memory functional layer 12 may be activated by electricity, heat, or the like to curl or restore the original shape.

As can be seen from the 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, a material of a different shape may be selected as the material of the reflective layer 13. In the following, several different reflective layers 13 provided in the embodiments of the present application are exemplarily described with reference to the accompanying drawings, taking aluminum as an example.

In some embodiments, as shown in fig. 9, fig. 9 is a schematic structural diagram of a reflective layer 13 provided in the embodiments of the present application, in order to improve the gain of the rollable projection screen 1, powdered aluminum powder may be selected, and the powder may be coated on the fresnel lens layer 14 by spraying, printing or vapor deposition. In this way, since the powdery aluminum powder is finer and has less obvious directivity, most of the light emitted by the projector 2 can be directionally reflected out of the projection screen according to the microstructure of the fresnel lens layer 14, and no scattered reflection of the light is caused, so that the gain of the projection screen is higher.

In addition, when aluminum particles are selected as the reflective material, the diameter of the aluminum particles may range from 5um to 20um. Because of the smaller diameter of the aluminum particles in this range, the aluminum particles form a compact reflecting surface after the reflecting layer 13 is formed, and when light irradiates on the reflecting surface, the light can be reflected as much as possible, thereby avoiding the waste of light energy. Meanwhile, when aluminum particles are selected as the reflecting material, the reflecting layer 13 can be made very thin, so that the consumption of the aluminum material can be saved, and the 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 according to an embodiment of the present application. When the reflective material of the reflective layer 13 is aluminum, a scaly aluminum powder may be selected. The scale-like aluminum powder is sprayed on the fresnel lens layer 14 by means of spray printing. Because the diameter and thickness of the scaly aluminum powder are larger, the aluminum has stronger binding capacity and is not easy to fall off. Wherein, the diameter-thickness ratio of the scaly aluminum powder can be in the range of (40:1) to (100:1).

The foregoing is merely a specific embodiment of the present application, but the protection 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 in the protection 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:

a plurality of functional layers, the plurality of functional layers being stacked;

wherein the multi-layer functional layer comprises:

at least one shape memory functional layer, wherein the shape memory functional layer has an initial shape, and the initial shape is a flat layered structure; the shape memory functional layer is used for curling to a temporary shape under the action of external conditions; the shape memory functional layer is also configured to recover from the temporary shape to the original shape under an external condition.

2. The rollable projection screen of claim 1, wherein the multi-layer functional layer further includes:

a reflective layer for reflecting light; the method comprises the steps of,

the Fresnel lens layer is arranged on one side of the reflecting layer in a layer-by-layer mode; a Fresnel microstructure is arranged on one side of the Fresnel lens layer, which is close to the reflecting layer;

the shape memory functional layer is positioned on one side of the reflecting layer far away from the Fresnel lens layer and is attached to the surface of one side of the reflecting layer far away from the Fresnel lens layer.

3. The rollable projection screen of claim 2, wherein the shape memory functional layer is annular; the shape memory functional layer is arranged around the periphery of the surface of the reflecting layer far away from one side of the Fresnel lens layer.

4. The rollable projection screen of claim 2, wherein the thickness of the shape memory functional layer is from 0.5mm to 2mm in a direction perpendicular to the surface of the fresnel lens layer on the side remote from the reflective layer.

5. The rollable projection screen of claim 1, wherein the multi-layer functional layer further includes:

a reflective layer for reflecting light; the method comprises the steps of,

the Fresnel lens layer is arranged on one side of the reflecting layer in a layer-by-layer mode; a Fresnel microstructure is arranged on one side of the Fresnel lens layer, which is close to the reflecting layer;

wherein the shape memory functional layer is positioned on one side of the Fresnel lens layer away from the reflecting layer.

6. The rollable projection screen of claim 5, wherein the shape memory functional layer is a shape memory polymer functional layer.

7. The rollable projection screen of claim 6, wherein the shape memory polymer functional layer is one of a radiation crosslinked polyethylene functional layer, a polynorbornene functional layer, a trans-polyisoprene functional layer, a polyurethane functional layer, and a polyester functional layer.

8. The rollable projection screen of claim 6, wherein the shape memory polymer functional layer is a photopatterned shape memory polymer functional layer; the photopaper-ture memory polymer functional layer is configured to enable the photopaper-ture memory polymer functional layer to curl to the temporary shape under light conditions and to enable the photopaper-ture memory polymer functional layer to revert to the original shape.

9. The rollable projection screen of claim 5, wherein the thickness of the shape memory functional layer is 50um to 150um in a direction perpendicular to a surface of the fresnel lens layer on a side away from the reflective 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 positioned on one side of the rollable projection screen and is used for projecting projection light rays towards the rollable projection screen.