CN113805421B

CN113805421B - Projection screen and projection arrangement can curl

Info

Publication number: CN113805421B
Application number: CN202111148478.5A
Authority: CN
Inventors: 张海鹏; 侯蕊; 王超
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-12-27
Anticipated expiration: 2041-09-27
Also published as: CN113805421A

Abstract

The application discloses projection screen and projection arrangement can curl relates to projection display technical field for solve projection screen among the prior art curl and expand the back again, appear the problem of roll warpage easily. The curlable projection screen comprises a reflection layer, a Fresnel lens layer and a base material layer which are arranged in a stacking mode, and further comprises at least one coating strip, wherein the coating strip is located on one side, away from the Fresnel lens layer, of the base material layer, and/or the coating strip is located on one side, away from the Fresnel lens layer, of the reflection layer. The extending direction of the coating strip and the curling axis of the curlable projection screen form an included angle, and the elastic recovery capability of the coating strip is higher than that of the curlable projection screen. The rollable projection screen is used for displaying images projected by the projector.

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, especially in the field of ultrashort-focus laser projection display, in order to achieve better brightness and display effect, a projector is generally used in combination with a projection screen having a fresnel microstructure.

In the prior art, projection screens are made of flexible materials that can be rolled along a roll axis. The axis of the curl is generally located on one side of the projection screen, that is, the projection screen can be curled along one side of the projection screen as an axis. Therefore, in the transportation process, the occupied space of the projection screen is reduced, and the whole transportation process is more convenient. However, after the projection screen which is curled for a long time is unfolded, the projection screen is easy to curl and warp, and is not easy to restore to be flat, which brings poor experience to subsequent installation and watching.

Disclosure of Invention

The application provides a projection screen and projection arrangement that can curl for solve projection screen among the prior art and curl the problem that the warpage appears easily after expanding again.

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

in a first aspect, the present application provides a rollable projection screen, including a reflective layer, a fresnel lens layer, and a substrate layer, which are stacked; the rollable projection screen further comprises at least one coating strip, wherein the coating strip is positioned on one side of the base material layer away from the Fresnel lens layer, and/or the coating strip is positioned on one side of the reflecting layer away from the Fresnel lens layer; the extending direction of the coating strip and the curling axis of the curlable projection screen form an included angle, and the elastic recovery capability of the coating strip is higher than that of the curlable projection screen.

The utility model provides a can curl projection screen includes at least one coating strip, and the coating strip is located the substrate layer and keeps away from Fresnel lens layer side, and/or, the coating strip is located the reflection stratum and keeps away from Fresnel lens layer side. The extending direction of the coating strip and the curling axis of the curlable projection screen form an included angle, and the elastic recovery capability of the coating strip is higher than that of the curlable projection screen. Thus, when the rollable projection screen is rolled along the roll axis, the paint bar will also roll with the rollable projection screen. After the rollable projection screen is re-unfolded, the elastic recovery capability of the coating strip is higher than that of the rollable projection screen, the coating strip can apply the elastic recovery force to the rollable projection screen, and the rollable projection screen can tend to be flat under the action of the elastic recovery force, so that the risk of the rollable projection screen that the rollable projection screen is turned over and warped is reduced, and the flatness of the rollable projection screen after being curled and re-unfolded is improved.

Further, the coating strip is positioned on the side of the reflecting layer far away from the Fresnel lens layer.

Further, the number of the coating strips is multiple, and the coating strips are arranged at intervals along the extending direction of the curling axis.

Furthermore, the coating strip is positioned on one side of the base material layer away from the Fresnel lens layer; the rollable projection screen also comprises a functional layer positioned on one side of the base material layer away from the Fresnel lens layer; the coating strips are located on the side of the functional layer in the direction of extension of the axis of curling.

Further, the number of the coating strips is two, and the two coating strips are positioned on two sides of the functional layer along the extending direction of the curling axis.

Furthermore, the number of the coating strips is multiple, and the coating strips are also positioned on the side, away from the Fresnel lens layer, of the reflecting layer.

Furthermore, an included angle between the extending direction of the coating strip and a curling axis of the curlable projection screen is a right angle; both ends of the coating bar are flush with the edge of the rollable projection screen in the extension direction of the coating bar.

Further, the material of the coating strip comprises one of a high molecular copolymer, a high molecular blend and a shape memory alloy.

Further, the coating bar is made of polymer blend, and the material of the polymer blend comprises polyurethane and polyamide.

In a second aspect, the present application provides a projection device comprising a projector and a rollable projection screen of any one of the first aspects.

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

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic diagram illustrating a positional relationship between a projector and a rollable projection screen when a projection apparatus provided in an embodiment of the present application is in use;

fig. 2 is a schematic structural diagram of a rollable projection screen according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of a coating bar located on a side of a reflective layer away from a Fresnel lens layer according to an embodiment of the present disclosure;

FIG. 4 is a schematic view of another structure of the coating strip according to the embodiment of the present disclosure, which is located on a side of the reflective layer away from the Fresnel lens layer;

fig. 5 is a schematic structural diagram of the coating bar provided in the embodiment of the present application when the coating bar is located on the side of the substrate layer away from the fresnel lens layer;

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

FIG. 7 is a schematic structural diagram of a surface layer provided in an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of another surface layer provided in an embodiment of the present application;

FIG. 9 is a schematic structural diagram of yet another surface layer provided in an embodiment of the present application;

FIG. 10 is a schematic diagram of a rollable projection screen according to an embodiment of the present disclosure;

fig. 11 is a schematic structural diagram of a lens layer provided in an embodiment of the present application;

FIG. 12 is a schematic diagram illustrating the path of light passing through the light-transmitting protrusion of FIG. 11;

FIG. 13 is a schematic diagram of a rollable projection screen according to an embodiment of the present disclosure;

fig. 14 is a schematic structural diagram of another rollable projection screen according to an embodiment of the present application;

fig. 15 is a schematic structural diagram of a fresnel lens layer according to an embodiment of the present disclosure;

fig. 16 is a schematic structural diagram of another fresnel lens layer provided in the embodiments of the present application;

fig. 17 is a schematic structural diagram of a reflective layer according to an embodiment of the present disclosure;

fig. 18 is a schematic structural diagram of another reflective layer provided in an embodiment of the present application.

Reference numerals:

100-a projection device; 1-a rollable projection screen; 11-a reflective layer; 12-a fresnel lens layer; 121-a reflective surface; 13-a substrate layer; 14-coating strips; 15-a surface layer; 151-microlenses; 16-a functional layer; 17-diffusing particles; 18-a lens layer; 181-light-transmitting bumps; 19-glue layer; 20-a coloured layer; 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 clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

In the description of the present application, it is to be understood that the terms, "upper," "lower," "front," "inner," and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specified.

It should be noted that in practical applications, due to the limitation of the precision of the device or the installation error, the absolute parallel or perpendicular effect is difficult to achieve. In the present application, the description about vertical, parallel or same direction is not an absolute limiting condition, but means that the vertical or parallel structural arrangement can be realized within a preset error range, and a corresponding preset effect is achieved, so that the technical effect of limiting the features can be maximally realized, the corresponding technical scheme is convenient to implement, and the feasibility is high.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be understood in a broad sense, e.g. fixedly, detachably or integrally connected. They may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the embodiments of the present application, 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 a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," 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.

The embodiment of the application provides a projection device, which is used for projecting and playing pictures, images and the like.

Referring to fig. 1, in use of projection device 100, projector 2 may be placed in front of and below rollable projection screen 1, and audience 3 is 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.

Therein, the projector 2 comprises a laser, which may be one of a monochromatic laser, a dichroic laser or a tricolor laser. In general, the wavelength of the blue laser light emitted by the laser can be set to 430-460nm, the wavelength of the green laser light emitted can be set to 500-540nm, and the wavelength of the red laser light emitted can be set to 610-650 nm.

Next, the rollable projection screen 1 in the projection apparatus 100 will be further described.

Referring to fig. 2 and 3, a rollable projection screen 1 provided in an embodiment of the present disclosure includes a reflective layer 11, a fresnel lens layer 12, and a substrate layer 13, which are stacked. Rollable projection screen 1 also includes at least one coating strip 14. Coating stripes 14 are located on the side of substrate layer 13 away from fresnel lens layer 12, and/or coating stripes 14 are located on the side of reflective layer 11 away from fresnel lens layer 12. The extension direction of the coating stripes 14 is at an angle to the curling axis of the rollable projection screen 1 and the elastic recovery of the coating stripes 14 is higher than the elastic recovery of the rollable projection screen 1.

The rollable projection screen 1 provided in the embodiment of the present application includes at least one coating bar 14, where the coating bar 14 is located on a side of the substrate layer 13 away from the fresnel lens layer 12, and/or the coating bar 14 is located on a side of the reflective layer 11 away from the fresnel lens layer 12. Wherein the extending direction of the coating strip 14 forms an angle with the curling axis of the rollable projection screen 1, and the elastic recovery capability of the coating strip 14 is higher than that of the rollable projection screen 1. Thus, when the rollable projection screen 1 is rolled along the roll axis, the paint stripes 14 also roll with the rollable projection screen 1. After the rollable projection screen 1 is re-unfolded, because the elastic recovery capability of the coating strip 14 is higher than that of the rollable projection screen 1, the coating strip 14 can apply the elastic recovery force to the rollable projection screen 1, and the rollable projection screen 1 can tend to be flat under the action of the elastic recovery force, so that the risk of the rollable projection screen 1 that is turned and warped is reduced, and the flatness of the rollable projection screen 1 after being rolled and re-unfolded is improved.

It will be appreciated that the rollable projection screen 1 is generally rectangular. When the projection screen 1 is curled, the curling axis may be located on a long side or a short side of the projection screen 1, and the projection screen 1 may be curled along the long side or the short side of the projection screen as the curling axis. Referring to fig. 3, the rollable projection screen 1 is rolled along one of its short sides, which is parallel to the first direction X, as a rolling axis. In this way, after the rollable projection screen 1 is unrolled again, two sides of the rollable projection screen 1 in the second direction Y are easily curled and warped. Of course, the rollable projection screen 1 may also be rolled along one of its long sides, which is parallel to the second direction Y, as the rolling axis. In this way, after the rollable projection screen 1 is unrolled again, two sides of the rollable projection screen 1 along the first direction X are easily curled and warped.

For the different curling manners, the coating strip 14 can be correspondingly adjusted, so that the extending direction of the coating strip 14 always forms an included angle with the curling axis. Like this, can curl projection screen 1 when curling, scribble strip 14 and also can be corresponding curly, can curl projection screen 1 when expandeing again, scribble strip 14 can provide elastic restoring force, can curl projection screen 1 under the effect of this elastic restoring force, can keep better roughness.

Further, referring to fig. 2, the rollable projection screen 1 further comprises a surface layer 15, the surface layer 15 being used to protect the rollable projection screen 1 from scratching the surface of the rollable projection screen 1.

Illustratively, referring to FIG. 3, the coating strips 14 are located on the side of the reflective layer 11 away from the Fresnel lens layer (not shown in FIG. 3).

The reflective layer 11 serves to reflect light entering the rollable projection screen 1. Referring to fig. 2, light entering the rollable projection screen 1 sequentially passes through the surface layer 15, the base layer 13, and the fresnel lens layer 12, reaches the reflective layer 11, is then reflected by the reflective layer 11, and finally exits from the surface layer 15. Will scribble strip 14 and set up and keep away from fresnel lens layer 12 one side at reflection stratum 11, can avoid scribbling strip 14 and lead to the fact the influence to getting into the light that can curl in projection screen 1, guarantee that can curl projection screen 1's optical property is not influenced, guarantee that can curl projection screen 1 inside light can normal reflection and transmission. Furthermore, in general, reflective layer 11 is the outermost structure of rollable projection screen 1, and the side thereof away from fresnel lens layer 12 has no other structure, which makes it more convenient to provide coating strips 14.

Wherein, the coating strip 14 can be coated on the surface of the reflective layer 11 on the side far from the fresnel lens layer 12. Illustratively, the coating 14 may be applied to the surface by knife coating, spraying, roll coating, electroplating, or the like.

In some embodiments, the coating 14 may also cover the surface of the reflective layer 11 on the side away from the fresnel lens layer 12. I.e. the length and width of the coating stripes 14 are equal to the length and width of the reflective layer 11, respectively. In this case, the coating bar 14 may also be referred to as a coating. The whole surface coating operation is simpler, and the coating process is easier.

In other embodiments, referring to fig. 3 and 4, the number of coating slips 14 is plural, and the plural coating slips 14 are spaced apart in the direction of the curling axis.

By adopting the scheme that the plurality of coating strips 14 are arranged at intervals along the direction of the curling axis, the coating strips 14 can provide elastic restoring force for the curled projection screen 1 after the curled projection screen 1 is curled and then unfolded, so that the curled projection screen 1 is kept flat after being unfolded again. Meanwhile, the mode of arranging the plurality of coating strips 14 at intervals can reduce the consumption of the material of the coating strips 14, and further save the manufacturing cost of the rollable projection screen 1.

Illustratively, referring to fig. 3, the surface of the reflective layer 11 on the side away from the fresnel lens layer (not shown in fig. 3) is provided with two coating stripes 14, and the two coating stripes 14 are respectively located on two sides of the reflective layer 11 along the first direction X. When the scheme is adopted, after the rollable projection screen 1 is rolled and then unfolded, the elastic restoring force of the two coating strips 14 on the two sides is received, and the elastic restoring force received by the whole rollable projection screen 1 is uniform, so that the whole rollable projection screen 1 keeps good flatness after being unfolded again.

Of course, referring to fig. 4, in order to increase the elastic restoring force provided by the coating bar 14, a plurality of coating bars 14 may be uniformly spaced along the first direction X. Thus, the rollable projection screen 1 is subjected to a stronger elastic restoring force after being unrolled again, and is less likely to be warped due to the rolling.

The arrangement of the coating bar 14 shown in fig. 3 and 4 is premised on the rollable projection screen 1 being rolled with one of its short sides as a rolling axis. The axis of the curling of the rollable projection screen 1 is parallel to the first direction X.

Illustratively, the projection of the coating bar 14 on the reflective surface may be rectangular, although other shapes are possible. The coating strip 14 may have a thickness of 0.1mm to 0.5mm and a width of 3cm to 5cm.

In other embodiments, referring to FIG. 5, the rollable projection screen further includes a functional layer 16. The coating stripes 14 are located on the side of the substrate layer 13 away from the fresnel lens layer 12. The coating strips 14 are located on the sides of the functional layer 16 in the direction of extension of the axis of curling.

Coating stripes 14 are arranged on the side of the substrate layer 13 away from the fresnel lens layer 12, that is, the coating stripes 14 are arranged inside the rollable projection screen 1, so that the coating stripes 14 are not easily damaged, and the coating stripes 14 are protected. Also, by positioning the coating strips 14 laterally of the functional layer 16, the coating strips 14 are positioned close to the edges of the overall rollable projection screen 1, and generally, less light passes therethrough, which reduces the effect of the coating strips 14 on the light incident on the interior of the rollable projection screen 1. Referring to fig. 5, the side edge of the functional layer 16 refers to the periphery of one side edge of the functional layer 16.

Of course, the coating stripes 14 may be disposed at other positions on the functional layer 16, and in this case, the coating stripes 14 are made of a material having a high light transmittance in consideration of the influence of the coating stripes 14 on the light inside the rollable projection screen 1.

Referring to fig. 5, diffusion particles 17 may be added in the functional layer 16, and the diffusion particles 17 can diffuse light entering the functional layer 16 so that the light is diffused in different directions. The material of the diffusion particles 17 may be methyl methacrylate (PMMA).

Of course, dark dyes may also be added to the functional layer 16, which may increase the contrast of the rollable projection screen 1. Referring to fig. 2, the functional layer 16 shown in fig. 2 is added with both the diffusion particles 17 and the dark dye, and therefore, the thickness of the functional layer 16 is thicker than the thickness of the functional layer 16 to which the diffusion particles 17 or the dark dye is added alone.

Illustratively, referring to fig. 5, when the coating stripes 14 are located on the side of the substrate layer 13 away from the fresnel lens layer 12, the number of the coating stripes 14 may be two, and two coating stripes 14 are located on both sides of the functional layer 16 along the extending direction of the curling axis.

With scribble the strip 14 setting and keep away from fresnel lens layer 12 in reflector layer 11 when the same, set up one respectively in the both sides of functional layer 16 and scribble the strip 14 for can curl projection screen 1 after expanding again, the elastic restoring force that receives is more even, and whole projection screen 1 that can curl can both receive the effect of elastic restoring force, makes whole projection screen 1 that can curl keep leveling, reduces the risk that the volume of turning over warpage appears. Of course, the coating stripes 14 may be single coating stripes 14, and the single coating stripes 14 may be applied to the surface of the substrate layer 13 away from the fresnel lens layer 12 around the functional layer 16. Thus, the rollable projection screen 1 can receive the elastic restoring force provided by the coating bar 14 with the long side or the short side thereof as the axis of the rolling.

It should be noted that, when the coating bar 14 is disposed on the side of the substrate layer 13 away from the fresnel lens layer 12, the thickness of the coating bar 14 may be smaller than or equal to the thickness of the functional layer 16, so as to avoid the problem that the surface of the rollable projection screen 1 is raised when the thickness of the coating bar 14 is too large.

In some embodiments, the number of the coating stripes 14 is plural, and when the coating stripes 14 are disposed on the side of the substrate layer 13 away from the fresnel lens layer 12, the coating stripes 14 may also be located on the side of the reflective layer 11 away from the fresnel lens layer 12.

In order to keep the rollable projection screen 1 flat after being rolled and unrolled, the coating strips 14 may be provided on both the side of the substrate layer 13 facing away from the fresnel lens layer 12 and the side of the reflective layer 11 facing away from the fresnel lens layer 12. Thus, after the rollable projection screen 1 is rolled and then unrolled, the plurality of coating bars 14 collectively provide elastic restoring force to the rollable projection screen 1 at different positions, thereby ensuring that the rollable projection screen 1 can maintain good flatness after being rolled and then unrolled.

Illustratively, referring to fig. 4, the extending direction of the coating stripes 14 is at a right angle to the curling axis of the rollable projection screen 1. In the direction of extension of the coating strip 14, both ends of the coating strip 14 are flush with the edges of the rollable projection screen 1.

After the rollable projection screen 1 is rolled and then unrolled, the edge positions of both sides of the rollable projection screen 1 are more likely to be rolled and warped in a direction perpendicular to the rolling axis. Therefore, the two ends of the coating strip 14 are flush with the edge of the rollable projection screen 1, and the edge position of the rollable projection screen 1, which is easy to curl, can be subjected to elastic restoring force, so that the better flatness is maintained, and the rolling and warping are not easy to occur. The direction of extension of the coated strands 14 is parallel to the axis of curl, and when there are multiple coated strands 14, the coating is more regular and the elastic recovery forces experienced throughout are more even. In the arrangement shown in fig. 4, the plurality of coating strips 14 are arranged perpendicular to the axis of curling, and the elastic restoring force experienced by the rollable projection screen 1 is relatively average throughout. In the rollable projection screen 1 shown in fig. 4, the rolling axis is a short side of the rollable projection screen, that is, the rolling axis is parallel to the first direction X, and the two ends of the rollable projection screen 1 are prone to rolling and warping along the second direction Y.

Of course, referring to fig. 3, the two ends of the coating bar 14 may not be flush with the edge of the rollable projection screen 1 in the extending direction of the coating bar 14.

Illustratively, the material of the coating bar 14 includes one of a polymer copolymer, a polymer blend, and a shape memory alloy.

The materials of the polymer copolymer and the polymer blend may include one or more of polyethylene, polypropylene, polyvinyl chloride, polystyrene, ABS, polyamide, polyurethane, cellulose acetate, polycarbonate, polyoxymethylene, polyphenylene oxide, thermoplastic polyester, polyimide, polyphenylene sulfide, and polysulfone.

The materials of the polymer copolymer and the polymer blend are not limited to the above-mentioned materials, and any materials may be used as the materials for forming the coating bar 14 as long as the formed coating bar 14 has a certain elasticity, can be bent, has a certain rigidity, and can limit the curling and warping after the rollable projection screen 1 is rolled and then unrolled.

The memory alloy material may include Au-Cd, ag-Cd, cu-Zn-Al, cu-Zn-Sn, cu-Zn-Si, cu-Sn, cu-Zn-Ga, in-Ti, au-Cu-Zn, niAl, fe-Pt, ti-Ni-Pd, ti-Nb, U-Nb, fe-Mn-Si, and the like. Since the shape memory alloy has good ability to recover deformation, it can also be used as a material for making the coating bar 14.

For example, the coating bar 14 provided in the embodiments of the present application may be made of a polymer blend, and the material of the polymer blend includes polyurethane and polyamide.

Because of the good elasticity of the polyurethane, it is ensured that the coating strips 14 can be bent without affecting the curling of the rollable projection screen 1. Meanwhile, because the polyamide has certain rigidity, after the rollable projection screen 1 is rolled and then unfolded, the rigidity of the rollable projection screen 1 can be utilized, so that the rollable projection screen 1 is kept in a tensioned and tense state, and better flatness is kept.

Wherein, the proportion of the polyurethane and the polyamide in the polymer blend can be set according to actual conditions, and the polymer blend is ensured to have certain elasticity and rigidity. Illustratively, the ratio between polyamide and polyurethane may be between (99.5. In the proportion range, the proportion of the polyamide is higher than that of the polyurethane, and the rigidity of the formed polymer blend is higher, so that the curlable projection screen can be kept in a tensioned and tense state well, and the good flatness is kept.

In some embodiments, referring to fig. 5, the rollable projection screen further includes a substrate layer 13, where the substrate layer 13 is located between the face layer 15 and the functional layer 16, and may serve as a base for the face layer 15. Meanwhile, the substrate layer 13 located between the functional layer 16 and the fresnel lens layer 12 may be used as a base for manufacturing the fresnel lens layer 12. Of course, the rollable projection screen 1 may also have only one substrate layer 13, and the number of the substrate layers 13 may be set according to actual requirements.

It will be appreciated that the substrate layer 13 in the rollable projection screen 1 is made of a flexible material. For example, the substrate layer 13 may be made of Polyethylene terephthalate (PET) material. The PET has flexibility such that the substrate layer 13 has flexibility, thereby achieving curling of the rollable projection screen 1.

Of course, in other embodiments, the substrate layer 13 may be made of other flexible materials, for example, a TPU flexible substrate layer may be made of a TPU material, and the TPU has elasticity and can achieve curling. The TPU flexible substrate layer is made of TPU, so that the substrate layer 13 can also have flexibility to realize curling. Alternatively, the substrate layer 13 may be made of a flexible material such as SBC (styrene Block Copolymers), and the substrate layer 13 may be flexible and rollable.

Alternatively, the substrate layer 13 may be made of polyvinyl chloride, polypropylene or polyethylene material. Wherein, the polyvinyl chloride has the advantages of good size stability, good weather resistance and low cost, and the hardness can be adjusted by using a plasticizer. The polypropylene has the advantages of easy dyeing, light weight, good toughness, high temperature resistance, good chemical resistance and the like. Polyethylene has the advantages of excellent low temperature resistance and good chemical stability.

The production of the fresnel lens layer 12 and the surface layer 15 will be briefly described below, taking as an example the rollable projection screen 1 shown in fig. 5.

The surface layer 15 is made of a flexible material. As an example, the surface layer 15 may be made of UV glue cured, which enables the surface layer 15 to be curled because the UV glue has elasticity.

In the production of the surface layer 15, the UV paste is applied to the substrate layer 13 (left substrate layer 13 in fig. 5) closest to the surface layer 15, and then the UV paste is cured by a UV light source lamp, thereby completing the production of the surface layer 15. Of course, in other embodiments, the surface layer 15 can be heat-cured on the substrate layer 13 by using a heat-curing glue, and the same can be used.

The fresnel lens layer 12 may also be made of UV glue cured, and the fresnel lens layer 12 may be curled because the UV glue has elasticity. One side of the fresnel lens layer 12, which is far away from the substrate layer 13 (the right substrate layer 13 in fig. 5), is provided with a plurality of reflection surfaces 121 arranged in the up-down direction, each reflection surface 121 is a plane inclined from top to bottom, an included angle θ between each reflection surface 121 and the plane perpendicular to the up-down direction can be gradually increased from top to bottom, and the included angle θ takes a value within a range of 5 degrees to 85 degrees.

When preparation fresnel lens layer 12, glue the coating with the UV and glue on the substrate layer 13 (right side substrate layer 13 in fig. 5) nearest fresnel lens layer 12, then carry out the impression to fresnel lens layer 12 with special mould for fresnel lens layer 12 shaping, reuse UV light source lamp to glue the UV and solidify, then the preparation of fresnel lens layer 12 can be accomplished in the drawing of patterns. Of course, in other embodiments, the fresnel lens layer 12 may be made of a thermosetting adhesive, and the same can be used.

The embodiment of the application also provides several different curlable projection screens, and the coating strips can be arranged on one sides, far away from the Fresnel lens layer, of the reflection layers in the several different curlable projection screens.

Referring to fig. 6, the rollable projection screen 1 in fig. 6 includes a reflection layer 11, a fresnel lens layer 12, a base material layer 13, and a surface layer 15. The function of each layer is the same as the function of the corresponding layer in the rollable projection screen 1 provided in the above-described embodiment, and will not be further described here.

With continued reference to fig. 6, in order to reduce the proportion of the light rays that are specularly reflected at the surface of the surface layer 15 on the side away from the substrate layer 13, the haze value of the surface layer 15 on the side away from the substrate layer 13 is set to be in the range of 12% to 20%. For example, the haze value may be set at 12%, 15%, 18%, or 20%. When the haze value on the surface of the surface layer 15 far away from the substrate layer 13 is in the range, the probability that the light irradiates on the surface of the surface layer 15 far away from the substrate layer 13 is low, so that the probability that the light generates a clear image in other places (such as a ceiling) can be reduced, and the watching experience of a user is improved.

Setting the haze value of the surface layer 15 on the side away from the substrate layer 13 can be achieved by at least the following two ways: 1. performing anti-glare treatment (i.e., AG treatment) on the surface layer 15 on the side away from the substrate layer 13; 2. the surface of the surface layer 15 far from the substrate layer 13 is embossed with a pattern engaging path by a mold.

Of course, in some embodiments, providing a haze value of greater than 20% on the surface of the surface layer 15 on the side away from the substrate layer 13 can also reduce the proportion of light that is specularly reflected at the surface of the surface layer 15 on the side away from the substrate layer 13.

In addition, in order to obtain high definition, the surface of the surface layer 15 on the side away from the substrate layer 13 may be a smooth surface. In this way, the diffusion of light at the surface of the surface layer 15 away from the substrate layer 13 can be reduced, and the definition of the rollable projection screen 1 can be improved.

Further, with continued reference to FIG. 6, a dark dye may also be added to the reflective layer 11, which may increase the contrast of the rollable projection screen 1. The dark color dye is generally an organic dye, and azo dyes, phthalocyanine dyes and the like can be selected.

Referring to fig. 7, 8 and 9, several different configurations of the surface layer 15 provided in the embodiments of the present application can be applied to the rollable projection screen provided in the embodiments of the present application.

Referring to fig. 7, a plurality of microlenses 151 are provided on the surface of the surface layer 15 side, and the microlenses 151 can improve the viewing angle of the rollable projection screen 1. Meanwhile, the probability of mirror reflection on the surface can be reduced, images are prevented from being formed at other places of light, and the viewing experience of image audiences is avoided.

Wherein the microlenses 151 are convex away from the surface layer 15. Illustratively, the microlens 151 may have a hemispherical shape, but may have other shapes.

Referring to fig. 8, the surface layer 15 is provided with the microlenses 151, and the microlenses 151 are provided with a haze value, thereby further reducing the probability of specular reflection of light on the surface and preventing formation of an image elsewhere.

Referring to fig. 9, diffusion particles 17 are distributed in the surface layer 15, and the diffusion particles 17 can diffuse light entering the surface layer 15, so that the light is diffused in different directions, thereby enlarging the viewing angle of a viewer. Meanwhile, due to the diffusion of light, the severity of speckle on the surface of the rollable projection screen can be reduced. In addition, the surface on the surface layer 15 side shown in fig. 9 was also subjected to haze value setting.

Referring to fig. 10, the rollable projection screen 1 shown in fig. 10 includes a reflection layer 11, a fresnel lens layer 12, a base material layer 13, a two-layer lens layer 18, a base material layer 13, and a surface layer 15, which are laminated. The lens layer 18 is used to diffuse the light entering the interior of the rollable projection screen 1, and to increase the viewing angle of the rollable projection screen.

Illustratively, referring to fig. 11, the lens layer 18 includes a plurality of light-transmissive protrusions 181. The light transmitting protrusion 181 may have a linear semi-cylindrical structure, that is, a cross section of the light transmitting protrusion 111 taken perpendicular to a surface thereof in a length extending direction has a semi-circular shape. The light-transmitting protrusions 111 may be press-molded by a mold when the substrate layer 13 is manufactured.

In order to simplify the shape of the die, thereby facilitating the manufacture of the die and reducing the manufacturing cost of the die. The sizes of the semicircular cross sections of the light-transmitting protrusions 181 in the length extending direction are the same, and the shapes and the sizes of the light-transmitting protrusions 181 are the same.

Illustratively, each of the light-transmitting protrusions 181 shown in fig. 11 extends in the width direction of the substrate layer 13, and is uniformly arranged in the length direction of the substrate layer 13. And the light-transmitting protrusions 181 are continuously arranged along the length direction of the substrate layer 13, that is, adjacent light-transmitting protrusions 181 are connected in sequence.

Referring to fig. 12, dotted lines and arrows in fig. 12 indicate paths of light rays incident into the air after passing through the light-transmitting protrusions 181. In the light outgoing process, the light rays can enter the air after passing through the light-transmitting protrusions 181, so that refraction occurs. Since the material of the transparent protrusion 181 is usually UV glue, which has a refractive index larger than that of air, light is diffused. Moreover, each light-transmitting protrusion 181 has an arc surface, so that light can be diffused along the length direction of the substrate layer 13, and the viewing angle of the rollable projection screen 1 in the length direction can be improved by the light-transmitting protrusion 181.

In other embodiments, the length of the light-transmitting protrusions 181 may also extend along other directions, and accordingly, light may be diffused along another set direction after passing through each light-transmitting protrusion 181 during the exiting process, so as to improve the viewing angle of the rollable projection screen 1 in the set direction.

Referring to fig. 10, the up-down direction is a width direction of the rollable projection screen 1. The plurality of light-transmitting protrusions 181 in the lens layer 18 (the lens layer 18 on the right side in fig. 10) adjacent to the fresnel lens layer 12 extend in the width direction of the base material layer 13, and the plurality of light-transmitting protrusions 181 in the lens layer 18 (the lens layer 18 on the left side in fig. 10) adjacent to the surface layer 15 extend in the length direction of the base material layer 13. Thus, the two lens layers 18 can simultaneously increase the viewing angle of the rollable projection screen 1 in the longitudinal and width directions. Wherein, OCA optical cement can be used to bond the two lens layers 18.

The transparent protrusion 181 is described as a semi-cylindrical structure, but the shape of the transparent protrusion 181 is not limited to be half of a cylindrical structure. In some cases, the area of a cross section of the light-transmitting protrusion 181 taken by a plane perpendicular to the lengthwise extension direction thereof may also be larger than the area of the corresponding semicircle or smaller than the area of the corresponding semicircle.

In other embodiments, the light-transmissive protrusion 181 may also be a protrusion with other shapes, such as a prism-shaped structure, which can also achieve the light diffusion.

Referring to fig. 13, the rollable projection screen 1 may also include only one lens layer 18, similar in shape and arrangement to the lens layer 18 on the left side of fig. 10, and will not be described further herein. The other structure of the rollable projection screen 1 is also the same as the structure shown in fig. 10 and will not be further described here.

Referring to fig. 14, the rollable projection screen 1 includes a reflection layer 11, a fresnel lens layer 12, a base material layer 13, an adhesive layer 19, a colored layer 20, an adhesive layer 19, a base material layer 13, and a surface layer 15, which are stacked. In this rollable projection screen 1, the colored layer 20 is provided separately, and both sides of the colored layer 20 are bonded to the two base material layers 13 with the adhesive layers 19, respectively. The colored layer 20 has a dark dye added therein to improve the contrast of the rollable projection screen 1. And diffusion particles 17 are distributed on the surface of the surface layer 15 on the side away from the substrate layer 13, and the diffusion particles 17 are used for improving the viewing angle of the rollable projection screen 1. The adhesive layer 19 may be an optically transparent adhesive layer, which does not allow transmission of image light in the rollable projection screen 1, for example, the adhesive layer 19 may be an OCA optical adhesive layer.

Referring to fig. 15, diffusing particles 17 may be added to fresnel lens layer 12 to improve the viewing angle of the rollable projection screen. It will be appreciated that the fresnel lens layer 12 shown in fig. 15 may be used in the various rollable projection screens 1 described above.

Alternatively, referring to fig. 16, a plurality of microlenses 151 are disposed on the reflective surface 121 of the fresnel lens layer 12, and the microlenses 151 can increase the degree of diffusion of light, thereby increasing the viewing angle of the viewer. Meanwhile, the light diffusion degree is increased, and the degree of speckles appearing on the surface of the curlable projection screen can be reduced.

In some embodiments, referring to fig. 17 and 18, reflective layer 11 may be coated on reflective surface 121 of fresnel lens layer 12. After the fresnel lens layer 12 is formed, the reflective surface 121 is coated with the reflective layer 11. Wherein, the reflective material of the reflective layer 11 may be aluminum; of course, in other embodiments, the reflective material in the reflective layer 11 may also be silver, or a combination of silver and aluminum.

Taking the example of aluminum as the reflective material, referring to fig. 17, in order to increase the gain of the rollable projection screen 1, powdered aluminum may be selected and coated on the reflective surface 121 by spray printing or vapor deposition. Therefore, because the powdered aluminum powder is finer and has less obvious directivity, most of the light emitted by the projector can be reflected out of the rollable projection screen in a directional manner according to the arrangement of the reflection surface 121 on the fresnel lens layer 12, and the light cannot be reflected around in a random manner, so that the gain of the rollable projection screen is higher. In addition, when powdered aluminum powder is used as the reflective material, the thickness of the reflective layer 11 can be made thin. The thinner the reflective layer 11 is made, the less consumption of aluminum, which is a reflective material, can save costs.

Of course, referring to fig. 18, when the reflective material of the reflective layer 11 is aluminum, it is also possible to select a scale-like aluminum powder. The scale-shaped aluminum powder is sprayed on the reflecting surface 121 by a spraying printing method. Since the radius-thickness ratio of the scaly aluminum powder is large, the aluminum has a strong bonding ability and is not easily detached when sprayed on the reflecting surface 121. The ratio of the diameter to the thickness of the flaky aluminum powder may range from (40.

After the reflective layer 11 is formed, it is generally a metal layer coated on the reflective surface 121 of the fresnel lens layer 12, and the thickness is very thin, so that the whole reflective layer 11 can be curled. As described above, since the fresnel lens layer 12 is made of a flexible material and can be rolled, when the reflective layer 11 is coated on the reflective surface 121 of the fresnel lens layer 12, the fresnel lens layer 12 and the reflective layer 11 are flexible as a whole, and can be rolled.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within 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

1. A curlable projection screen is characterized by comprising a reflecting layer, a Fresnel lens layer and a base material layer which are arranged in a laminating way;

the rollable projection screen further comprises:

at least one coating strip, wherein the coating strip is positioned on one side of the base material layer far away from the Fresnel lens layer, and/or the coating strip is positioned on one side of the reflecting layer far away from the Fresnel lens layer;

the extending direction of the coating strip and the curling axis of the curlable projection screen form an included angle, and the elastic recovery capability of the coating strip is higher than that of the curlable projection screen; and the extending direction of the coating strip and the curling axis of the curlable projection screen form a right angle.

2. The rollable projection screen of claim 1, wherein the coating is located on a side of the reflective layer away from the fresnel lens layer.

3. A rollable projection screen according to claim 2, wherein the number of the coating strips is plural, and the plural coating strips are spaced apart in the extending direction of the rolling axis.

4. The rollable projection screen of claim 1, wherein the coating strips are located on a side of the substrate layer away from the fresnel lens layer; the rollable projection screen further comprises a functional layer positioned on one side of the base material layer away from the Fresnel lens layer;

the coating bar is located on the side of the functional layer along the extension direction of the curling axis.

5. A rollable projection screen according to claim 4, wherein the number of the coating strips is two, the two coating strips being located on either side of the functional layer in the extension of the rolling axis.

6. The rollable projection screen of claim 4, wherein the number of the coating strips is plural, the coating strips further being located on a side of the reflective layer away from the Fresnel lens layer.

7. A rollable projection screen according to any one of claims 1 to 6, wherein both ends of the coating strip are flush with the edges of the rollable projection screen in the extension direction of the coating strip.

8. The rollable projection screen of claim 1, wherein the material of the coating strips comprises one of a polymer copolymer, a polymer blend, and a shape memory alloy.

9. The rollable projection screen of claim 8, wherein the coating strips are made of a polymer blend, and the polymer blend material comprises polyurethane and polyamide.

10. A projection device comprising a projector and a rollable projection screen according to any one of claims 1 to 9.