Rollable projection screen

Abstract

The invention discloses a rollable projection screen, and belongs to the field of projection display, and the rollable projection screen has a rolling axis direction, and comprises a rollable screen sheet which comprises an imaging display surface; the supporting pieces are arranged on the opposite side face of the imaging display face of the curtain piece, the extending direction of the supporting pieces is consistent with the winding shaft line direction, and the supporting pieces are arranged in parallel at intervals in the direction perpendicular to the winding shaft line direction; the flexible light materials are arranged in the gaps of the supporting sheets; the flexible light materials are arranged in the gaps of the supporting sheets; the density of the flexible light material is not larger than 0.8 g / cm < 3 >, and the material density of the supporting sheet is not smaller than 1.3 g / cm < 3 >. According to the projection screen, under the common support of the support sheet and the flexible light material, the flatness of the imaging display surface of the projection screen is ensured, the overall weight and the rolling diameter of the projection screen are further reduced, and packaging, transportation and home-entry installation of the projection screen are facilitated.

Description

Technical Field

[0001] This application relates to the field of projection display, and particularly to a retractable projection screen. Background Art

[0002] In the prior art of projection display, retractable projection screens are often made of rollable sheets to achieve the rolling function. Compared with non-retractable projection screens, retractable projection screens have many advantages. First, the volume for packaging and transportation becomes smaller after being rolled up, reducing the difficulty and cost of packaging and transportation. Second, it is convenient to enter the household. It is very difficult for a 120-inch rigid flat screen to enter a home through an elevator, which makes it difficult to popularize large-size projections in homes. Third, when the retractable projection screen is not in use after installation, it can be rolled up to make the environment more beautiful.

[0003] However, in reality, there are many adverse factors when a retractable projection screen is rolled up and then unfolded. Figure 1 As a schematic diagram of the prior art retractable projection screen being rolled up and then unfolded and placed flat on a horizontal plane, it can be seen that when the retractable projection screen 1100 is rolled up and then unfolded, problems such as arching, warping, and wavy patterns occur on the retractable projection screen. The problem is more serious in the four peripheral edge areas and the retractable projection screen cannot return to a flat state by itself. Figure 2 As a schematic diagram of the prior art retractable projection screen being rolled up and then unfolded and hung on a wall, it can be seen that when the retractable projection screen 1100 is rolled up and then unfolded and hung, there are still problems of unevenness such as arching, warping, and wavy patterns due to the self-weight of the retractable projection screen. In the prior art, problems such as arching, warping, and wavy pattern deformations occur on the retractable projection screen, which will cause the overall or partial distortion of the projected image, seriously affecting the viewing effect.

[0004] One solution is to set an enhanced structure layer on the back of the rollable projection screen. The projection screen is made flat by the support of the enhanced structure layer. However, the enhanced structure layer needs to be relatively thick to have a good effect, and a relatively thick enhanced structure layer will make the rolling diameter of the projection screen larger and the overall weight heavier, which is also not conducive to packaging, transportation, and household installation. Therefore, this application provides a more effective solution to make the projection screen have a small rolling diameter and light weight when being rolled up, and a flat surface when being rolled up and then unfolded. Summary of the Invention

[0005] The present application provides a retractable projection screen, which solves the problems that the existing retractable projection screen has a large curling diameter and a heavy weight, which are not conducive to packaging, transportation and in-home installation, and the flatness after retraction is poor. The solution of the present application, through the joint support of the support sheet and the flexible lightweight material, not only ensures the flatness of the imaging display surface of the projection screen, but also reduces the overall weight and retraction diameter of the projection screen, facilitating the packaging, transportation and in-home installation of the projection screen.

[0006] The technical solution provided by the present application is as follows:

[0007] A retractable projection screen having a retraction axis direction, comprising:

[0008] A retractable screen sheet, the screen sheet including an imaging display surface;

[0009] A plurality of support sheets, the support sheets being disposed on the opposite side of the imaging display surface of the screen sheet, the extending direction of the support sheets being the same as the retraction axis direction, and the support sheets being arranged in parallel at intervals perpendicular to the retraction axis direction;

[0010] And a flexible lightweight material, the flexible lightweight material being disposed in the gaps between the support sheets;

[0011] The density of the flexible lightweight material is not greater than 0.8 g / cm 3 , and the material density of the support sheet is not less than 1.3 g / cm 3 .

[0012] In the present application, the screen sheet is retractable and includes an imaging display surface. Thus, the screen sheet itself is woundable and is used for imaging a projection image.

[0013] In the present application, the support sheets are disposed on the opposite side of the imaging display surface of the screen sheet to support the screen sheet and prevent the whole or partial warping and deformation of the screen sheet. A flexible lightweight material is disposed between the support sheets. The flexible lightweight material itself has a telescopic property and can also be curled, and can further connect the support sheets into one body, further enhancing the strength and stability of the support sheets, and thus ensuring the flatness of the screen sheet.

[0014] In the present application, by disposing a flexible lightweight material with a smaller density in the intervals between the support sheets, on the one hand, the overall weight of the support structure on the back of the screen sheet can be reduced, and thus the overall weight of the projection screen is also reduced; on the other hand, through the strengthening of the support sheets by the flexible lightweight material, while reducing the thickness of the support sheets, good support strength can still be obtained, so that the overall thickness of the projection screen is also reduced, and thus the retraction diameter of the projection screen is further reduced, facilitating packaging, transportation and in-home installation.

[0015] Further, the support sheet is a single-layer or multi-layer sheet material.

[0016] In this application, a single-layer support sheet plus a flexible lightweight material already has a good supporting and flattening effect on the screen sheet. When the support sheet is set to be multi-layered, the strength of the support sheet can be enhanced by the superposition of multi-layer sheets, thereby meeting the needs of different screen flatness supports.

[0017] Further, the support sheet includes a fiber-reinforced material, and the fiber-reinforced material is at least one of glass fiber, carbon fiber, polyethylene fiber, aramid fiber, and graphene fiber.

[0018] In this application, adding a fiber-reinforced material to the support sheet can significantly enhance the strength of the support sheet, thereby reducing the thickness dimensions of the support sheet and the flexible lightweight material, and also reducing the curling diameter of the projection screen, which is convenient for packaging, transportation, and in-home installation.

[0019] Further, the cross-sectional shape of the support sheet is rectangular, triangular, trapezoidal, or semi-circular.

[0020] In this application, setting different cross-sectional shapes of the support sheet can be used to adjust the connection force between the support sheet and the screen sheet, thereby adapting to the screen requirements of different support strengths.

[0021] Further, the material of the support sheet is polyethylene terephthalate, polymethyl methacrylate, polyethylene, polypropylene, polyvinyl chloride, or polycarbonate.

[0022] In this application, different support sheet materials have different support strengths, and the material is selected to meet the different support strength requirements of the projection screen.

[0023] Further, the height of the support sheet is not greater than 5 mm, and the spacing between adjacent support sheets is not less than 1 mm.

[0024] In this application, under the premise of meeting the support strength requirements, the smaller the height of the support sheet, the smaller the overall thickness of the projection screen, and the smaller the curling diameter after winding; the larger the spacing between adjacent support sheets, the more flexible lightweight material, and the smaller the overall weight of the projection screen, which is also convenient for the packaging, transportation, and in-home installation of the projection screen.

[0025] Further, the flexible lightweight material is a foaming material, and the foaming material is at least one of polyurethane foaming material, polyethylene foaming material, polystyrene foaming material, silicone foaming material, acrylic foaming material, and phenolic resin foaming material.

[0026] In this application, the flexible lightweight material is a foaming material, and the material density is reduced by the foaming material to reduce the weight of the support material, thereby effectively reducing the overall weight of the projection screen.

[0027] Further, the length of the support sheet is equal to the width of the screen sheet, and the space between adjacent support sheets is filled with a flexible lightweight material.

[0028] In the present application, the length of the support sheet is equal to the width of the screen sheet, which can support the full size of the screen sheet and obtain a flatter screen sheet.

[0029] Further, the flexible lightweight material fills the opposite side of the imaging display surface of the screen sheet.

[0030] In the present application, the flexible lightweight material fills the opposite side of the imaging display surface of the screen sheet, which can further enhance the support effect on the screen sheet and reduce the weight of the screen sheet.

[0031] Further, the screen sheet is a white plastic screen, a metal screen, a glass bead screen, a Fresnel screen or a line grating screen.

[0032] In the present application, the rollable screen sheet can be a screen sheet including various functional layers, and the support solution of the present application can well solve the problems of flatness, transportation, packaging and installation of the projection screen.

[0033] The present invention has the following beneficial effects:

[0034] The support sheet is arranged on the opposite side of the imaging display surface of the screen sheet to support the screen sheet and prevent the whole or partial warping and deformation of the screen sheet; a flexible lightweight material is arranged between the support sheets. The flexible lightweight material itself has the characteristics of expansion and contraction and can be curled, and can also connect the support sheets into one body, which can further strengthen the strength and stability of the support sheets, and thus ensure the flatness of the screen sheet.

[0035] By arranging a flexible lightweight material with a smaller density in the space between the support sheets, on the one hand, the support weight on the back of the screen sheet can be reduced, and the overall weight of the projection screen can be reduced; on the other hand, through the strengthening of the flexible lightweight material on the support sheets, while reducing the thickness of the support sheets, good support strength can be obtained, so that the overall thickness of the projection screen is reduced, and thus the winding diameter of the projection screen is further reduced, which is convenient for the packaging, transportation and household installation of the projection screen. Description of the Drawings

[0036] Figure 1 is a schematic diagram of the projection screen in the prior art after being unrolled on a horizontal plane;

[0037] Figure 2 is a schematic diagram of the projection screen in the prior art after being unrolled and hung on a wall surface;

[0038] Figure 3 is a schematic diagram of the structure of the projection screen according to the embodiment of the present application;

[0039] Figure 4 It is a schematic diagram of the support sheet structure of an embodiment of the present application;

[0040] Figure 5 It is a schematic diagram of the cross-sectional shape of the support sheet of an embodiment of the present application;

[0041] Figure 6 It is a schematic diagram of the support sheet dimensions of an embodiment of the present application;

[0042] Figure 7 It is a schematic diagram of the support sheet and screen sheet dimensions of an embodiment of the present application;

[0043] Figure 8 It is a schematic diagram of the arrangement of the flexible lightweight material of an embodiment of the present application;

[0044] Figure 9 It is a schematic diagram of the screen sheet structure of an embodiment of the present application;

[0045] Among them, the meanings of the reference numerals in the figure are as follows:

[0046] 1100 - projection screen; 10 - screen sheet; 110 - imaging display surface; 20 - support sheet; 30 - flexible lightweight material; X - winding axis direction; Y - direction perpendicular to the winding axis; h - height; p - spacing; L - length of the support sheet; K - width of the screen sheet. Detailed implementation manners

[0047] The terms used in the implementation part of the present application are only used to explain the specific embodiments of the present application, rather than to limit the present application.

[0048] Figure 3 It is a schematic diagram of the projection screen structure of an embodiment of the present application. A retractable projection screen has a winding axis direction X. The projection screen includes: a retractable screen sheet 10, and the screen sheet 10 includes an imaging display surface 110; a plurality of support sheets 20, the support sheets 20 are arranged on the opposite side of the imaging display surface 110 of the screen sheet 10, the extending direction of the support sheets 20 is consistent with the winding axis direction X, and the support sheets 20 are arranged in parallel at intervals in the direction Y perpendicular to the winding axis; a flexible lightweight material 30, the flexible lightweight material 30 is arranged in the gaps between the support sheets 20; the density of the flexible lightweight material 30 is not greater than 0.8 g / cm 3 , and the material density of the support sheet 20 is not less than 1.3 g / cm 3 .

[0049] In the embodiment of the present application, the imaging display surface 110 of the retractable screen sheet 10 is used to image the projection image; the screen sheet 10 itself is rollable, which is beneficial to the winding of the projection screen and ensures the overall display effect after winding and unfolding.

[0050] In the embodiment of the present application, the support sheet 20 is disposed on the opposite side of the imaging display surface 110 of the screen sheet 10 to support the screen sheet 10 and prevent the screen sheet 10 from warping and deforming as a whole or locally. Moreover, a flexible lightweight material 30 is disposed between the support sheets 20. The flexible lightweight material 30 itself has the characteristics of expansion and contraction and can also be curled, and can connect the support sheets 20 into one body, further enhancing the strength and stability of the support sheets 20, thereby ensuring the flatness of the screen sheet 10.

[0051] In the embodiment of the present application, by disposing the flexible lightweight material 30 with a smaller density within the intervals of the support sheets 20, on the one hand, the overall weight of the support structure on the back surface of the screen sheet can be reduced, and thus the overall weight of the projection screen is also reduced; on the other hand, through the strengthening of the support sheets 20 by the flexible lightweight material 30, good support strength can be obtained while reducing the thickness of the support sheets 20, so that the overall thickness of the projection screen is also reduced, further reducing the winding diameter of the projection screen and facilitating the packaging, transportation and in-home installation of the projection screen.

[0052] Further explanation is that the support sheet can be disposed on the opposite side of the imaging display surface 110 of the screen sheet 10 by means of pasting, magnetic attraction, etc. Preferably, the support sheet 20 is pasted on the opposite side of the imaging display surface 110 of the screen sheet 10 by an adhesive.

[0053] Specifically, the adhesive has certain shrinkage and extension characteristics. During the winding process of the projection screen, the stress / tension between the screen sheet 10 and the support sheet 20 is relieved, avoiding damage to the bonding structure between the support sheet 20 and the screen sheet 10.

[0054] More specifically, the adhesive can be polyacrylic acid elastic glue, epoxy resin elastic glue, polyurethane elastic glue, silicone rubber elastic glue, ethylene-vinyl acetate copolymer (EVA) hot melt glue, polyamide hot melt glue, polyester hot melt glue, polyolefin hot melt glue, polyvinyl chloride plastic, polyvinyl acetate or chloroprene rubber, etc., which have strong adhesiveness and strong elastic expansion and contraction characteristics after curing to ensure the shrinkage and extension characteristics of the adhesive.

[0055] Further explanation is that the flexible lightweight material 30 can be disposed in the gaps between the support sheets 20 by means of pasting, clamping, etc. Preferably, the flexible lightweight material 30 is pasted in the gaps between the support sheets 20 by an adhesive, and the characteristics of this adhesive are the same as those of the adhesive of the support sheet 20.

[0056] Specifically, a support sheet 20 can be first pasted on the side opposite to the imaging display surface of the screen sheet 10 through an adhesive, and then pasted one by one on the side opposite to the imaging display surface of the screen sheet 10, and then the flexible lightweight material is bonded in the gaps of the support sheet 20; alternatively, a plurality of support sheets 20 and the flexible lightweight material 30 can be adhesively bonded at intervals to form a whole, and then pasted on the side opposite to the imaging display surface of the screen sheet 10.

[0057] Further explanation is as follows. The extension direction of the support sheet 20 is set to be consistent with the winding axis direction X, and the support sheets 20 are arranged in parallel at intervals in the direction Y perpendicular to the winding axis, so that it is easier to wind the projection screen into a cylindrical shape along the winding axis direction X, and the projection screen will also be more flat when unfolded. When the extension direction of the support sheet 20 is not consistent with the winding axis direction X, the support sheet 20 will resist the winding of the projection screen, making it difficult to wind the projection screen; when the support sheets 20 are not arranged in parallel at intervals in the direction Y perpendicular to the winding axis, the supporting force of the support sheet 20 on the screen sheet 10 is uneven on the screen surface, resulting in inconsistent flatness of the projection screen after winding and unfolding, affecting the overall flatness of the screen surface.

[0058] Further explanation is as follows. The distance between any adjacent support sheets can be unequal or equal. Preferably, the distance between any adjacent support sheets is equal. When the support sheets are arranged, they are equidistant and present a certain pattern, which is convenient for obtaining a uniform supporting force on the screen sheet and ensuring the flatness of the projection screen.

[0059] Further explanation is as follows. According to the material, size specification, and application scenario of the screen sheet, the specific arrangement of a plurality of support sheets can be optimized to reduce the difficulty in the production and manufacturing process of the projection screen. While ensuring the flatness and stability of the projection screen, the number of support sheets can be reduced and the weight of the projection screen can be reduced. That is to say, ensuring the flatness and stability of the projection screen is the first element, and then considerations can be made from aspects such as weight. For example, when the material of the screen sheet itself is relatively hard and the screen sheet is prone to warping and difficult to flatten after winding, the distance between the arranged support sheets needs to be small, and the number of support sheets is increased, thereby increasing the overall bending resistance strength of the support; when the material of the screen sheet itself is relatively soft, the distance between the support sheets is selected to be larger. On the basis of ensuring the overall bending resistance strength of the support, the number of support sheets is reduced, thereby reducing the weight of the projection screen, which is beneficial to packaging, transportation, and in-home installation.

[0060] Further explanation is as follows. The density of the flexible lightweight material 30 is set to be no more than 0.8 g / cm 3 , while ensuring the strength enhancement of the flexible lightweight material to the support sheet, the weight of the overall projection screen is reduced as much as possible; when the density of the flexible lightweight material is greater than 0.8 g / cm 3, although the strength can be enhanced, the weight of the material will also increase more, which is not conducive to reducing the overall weight of the projection screen.

[0061] Furthermore, the flexible lightweight material can be a foamed material, and the foamed material can be one or a combination of polyurethane foamed materials, polyethylene foamed materials, polystyrene foamed materials, silicone foamed materials, acrylic foamed materials, and phenolic resin foamed materials.

[0062] Specifically, the flexible lightweight material is a foamed material. By using the foamed material, the material density is reduced, and the weight of the support material is reduced, thereby effectively reducing the overall weight of the projection screen.

[0063] Further explanation, the material density of the support sheet 20 is not less than 1.3 g / cm 3 , which can ensure the strong strength of the support sheet and obtain a projection screen with good flatness; while the material density of the support sheet 20 is less than 1.3 g / cm 3 , the strength of the support sheet is weakened more, it is difficult to support the screen surface, and the flatness of the projection screen is poor.

[0064] Furthermore, Figure 4 is a schematic structural diagram of the support sheet according to an embodiment of the present application. The support sheet 20 can be a single-layer sheet or a multi-layer sheet.

[0065] Further explanation, a single-layer support sheet 20 plus a flexible lightweight material already has a good supporting and flattening effect on the screen sheet. When the support sheet 20 is set to be multi-layer, the strength of the support sheet can be enhanced by adjusting the superposition of multi-layer sheets, so as to meet the needs of different screen sheet flatness supports.

[0066] Furthermore, the support sheet can include a fiber-reinforced material, and the fiber-reinforced material is one or a combination of glass fiber, carbon fiber, polyethylene fiber, aramid fiber, and graphene fiber.

[0067] Further explanation, adding a fiber-reinforced material to the support sheet greatly enhances the strength of the support sheet, thereby reducing the thickness dimensions of the support sheet and the flexible lightweight material, and also reducing the curling diameter after the projection screen is curled, which is convenient for the packaging, transportation, and in-home installation of the projection screen. It can also adjust the strength of the support sheet through the fiber-reinforced material, so as to obtain support sheets with different strengths, which can meet the different support strength requirements of the projection screen.

[0068] Figure 5 is a schematic diagram of the cross-sectional shape of the support sheet according to an embodiment of the present application. As Figure 5 shown in Figure a and Figure b, the cross-sectional shape of the support sheet can be rectangular; as Figure 5 shown in Figure c, the cross-sectional shape of the support sheet can be triangular; as Figure 5As shown in Figure d, the cross-sectional shape of the support sheet can be trapezoidal; as Figure 5 As shown in Figure e, the cross-sectional shape of the support sheet can be semi-circular. For ease of production and processing, it is preferred that the cross-sectional shape of the support sheet is rectangular, triangular or trapezoidal.

[0069] Further explanation is that setting different cross-sectional shapes of the support sheet can be used to adjust the connection force between the support sheet and the screen sheet, so as to meet the requirements of projection screens with different support strengths.

[0070] Furthermore, the material of the support sheet can be polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC) or polycarbonate (PC).

[0071] Further explanation is that different materials of the support sheet will result in different support strengths. The selection of the support sheet material is preferably based on meeting the different support strength requirements of the projection screen, and then considering factors such as economy and health. It is preferred that the material of the support sheet is polyethylene terephthalate (PET). Of course, common metal materials such as aluminum and copper can also be used as the material of the support sheet.

[0072] Flatness and Stability Test of Projection Screen

[0073] 1. Articles

[0074] Projection screen samples of the embodiments of this application.

[0075] 2. Test Method

[0076] The projection screen samples of the embodiments of this application are respectively wound and unwound 100 times, 500 times, 1000 times, 2000 times, 5000 times. One complete process of winding and unwinding is recorded as 1 time, and it is observed whether there are wavy patterns or warping; after the above-mentioned number of times of winding and unwinding, imaging is performed, and it is observed whether the displayed image is flat and clear.

[0077] 3. Test Record Table

[0078]

[0079] It can be seen from the above record table that the projection screen of the embodiments of this application is not prone to deformation such as wavy patterns and warping after being used repeatedly for many times. The displayed image is flat and clear, the stability of the displayed image is high, and the overall display effect of the projected image is guaranteed.

[0080] Upon further analysis, the projection screen of the embodiment of the present application combines a support sheet and a flexible lightweight material, obtaining good support strength, thereby being able to effectively resist deformations such as warping and wavy patterns after the projection screen is wound up, enhancing the flatness and stability of the projection screen after it is unfolded. The projection screen has a high flatness and good stability for the imaging display picture.

[0081] Figure 6 It is a schematic diagram of the size of the support sheet of the embodiment of the present application. The height h of the support sheet 20 is not greater than 5 mm, and the spacing P between adjacent support sheets is not less than 1 mm.

[0082] Specifically, when meeting the support strength requirements, the smaller the height h of the support sheet, the smaller the overall thickness of the screen and the smaller the curling diameter; the larger the spacing P between adjacent support sheets, the more flexible lightweight material, and the smaller the overall weight of the screen, which is also convenient for the packaging, transportation, and in-home installation of the screen. Therefore, when the height h of the support sheet 20 is greater than 5 mm, the curling diameter of the screen is relatively large, which is not conducive to the packaging, transportation, and in-home installation of the screen; when the spacing P between adjacent support sheets is less than 1 mm, there is less flexible lightweight material, and the overall weight of the screen is relatively large, which is also not conducive to the packaging, transportation, and in-home installation of the screen.

[0083] Figure 3 It is a schematic diagram of the structure of the projection screen of the embodiment of the present application; Figure 7 It is a schematic diagram of the size of the support sheet and the screen sheet of the embodiment of the present application. The length L of the support sheet is equal to the width K of the screen sheet, and the space between adjacent support sheets 20 is filled with a flexible lightweight material 30.

[0084] For further explanation, the length L of the support sheet is equal to the width K of the screen sheet, which supports the entire size of the screen sheet 10, and a flatter screen sheet can be obtained, better ensuring the flatness of the projection screen. If L < K, since the support sheet 20 is shorter than the screen sheet 10, it is difficult for the bending strength of the support sheet 20 to be transmitted to the entire surface of the screen sheet 10, and warping and wavy patterns are likely to occur in the area of the screen sheet 10 that is not connected to the support sheet 20.

[0085] Figure 8 It is a schematic diagram of the setting of the flexible lightweight material of the embodiment of the present application. The flexible lightweight material 30 fills the opposite side of the imaging display surface 110 of the screen sheet 10.

[0086] For further explanation, the flexible lightweight material 30 fills the opposite side of the imaging display surface 110 of the screen sheet 10, which can further enhance the support effect on the screen sheet 10 and reduce the weight of the screen sheet 10.

[0087] Figure 9 It is a schematic diagram of the structure of the screen sheet of the embodiment of the present application. As Figure 9 shown in Figure a in Figure 9As shown in Figure b, the screen 10 is a Fresnel screen; as Figure 9 As shown in Figure c, the screen 10 is a wire grid screen.

[0088] For further explanation, the screen can be an ordinary projection screen such as a white plastic screen, a metal screen, or a glass bead screen, or it can be an optical screen such as a Fresnel screen, a wire grid screen, or a photon screen. Whether it is an ordinary screen or an optical screen, the function of the screen is to image the image light emitted by the projector. Whether these screens are a single functional structure layer (such as the diffuse reflection functional layer of a white plastic screen or the metal directional reflection layer of a metal screen), or multiple functional structure layers (such as the diffusion layer, color layer, Fresnel lens layer, and reflection layer of a Fresnel optical screen, or the reflection layer, light absorption layer, and grating structure layer of a wire grid screen), these screens will also exhibit unevenness, warping, transportation, packaging, and installation problems after being rolled up and unrolled. Therefore, the solution of this application can be applied to solve the warping problem and meet the viewing requirements of the projected image. Therefore, they all fall within the scope of protection of the projection screen of the solution of this application.

[0089] The projection screen can further include an elastic material layer, which is disposed on the side of the support sheet 20 away from the screen 10, and the elastic material layer has the functions of contraction and extension. During the process of rolling up the projection screen, when the elastic material layer is rolled up inside, the elastic material layer relies on its own shrinkability to release the curling stress; when the elastic material layer is rolled up outside, the elastic material layer relies on its own ductility to release the winding tension, thereby eliminating the resistance of the elastic material layer to the winding of the screen 10. In addition, during the process of rolling up the projection screen, the elastic material layer also acts as a protective layer function to prevent the projection screen from being scratched.

[0090] Specifically, the material of the elastic material layer can be one or a combination of flexible film materials such as polyurethane film, polyethylene film, polypropylene film, polyamide film, polypropylene film, polystyrene film, styrene film, silicone film, thermoplastic polyurethane (TPU) film, polyvinyl chloride film, chloroprene rubber film, ethylene-propylene rubber film, plasticized polyolefin film, chlorosulfonated polyethylene film, chlorinated polyethylene film, butene rubber film, thermoplastic synthetic rubber film, and chlorinated ether rubber film. That is, there are many raw materials available for making the elastic material layer, and it is not limited to certain raw materials. In actual use, some relatively inexpensive ones can be selected as much as possible to control the production and manufacturing cost of the entire projection screen.

[0091] Furthermore, the projection screen can further include a winding shaft and a counterweight rod. Both the winding shaft and the counterweight rod are parallel to the winding axis direction X and are located at two opposite edges of the screen 10. The winding shaft is located at the position where the projection screen is hung on the wall, and the counterweight rod is located at the other end.

[0092] Specifically, the take-up reel is used for manually or electrically winding / unwinding the screen sheet 10, and can also be used as a hanger for mounting a retractable projection screen; the counterweight rod itself also has a certain bending strength, which can further promote the flatness of the projection screen after installation.

[0093] Furthermore, the projection screen here can be called a lifting screen, and the projection screen can also include a take-up reel and a lifting mechanism; the take-up reel is arranged parallel to the winding axis direction X and is located at the edge of the screen sheet; the lifting structure is arranged on the side of the screen sheet close to the support sheet. The take-up reel is used for winding and unwinding the projection screen and provides a resistance to unwinding; the lifting mechanism is used for supporting and unfolding the projection screen.

[0094] Specifically, when not in need of viewing, the projection screen is wound into the box by the take-up reel, and when viewing is required, the retractable projection screen is lifted from the box by the supporting force of the lifting mechanism to achieve the purpose of viewing. In addition, the projector can also be built into the box to avoid the influence of the movement of the projector on viewing.

[0095] Specifically, the lifting mechanism mainly provides a supporting force for the projection screen in the y direction, but in the x direction, the supporting force of the lifting mechanism is very small. Combined with the support sheet, it can effectively solve the problem of unevenness of the lifting screen in the prior art. The projection screen of the present application can also be applied to application scenarios such as floor-standing screens, electric screens, and bracket screens, and can effectively solve the problem of unevenness in these application scenarios of retractable projection screens.

[0096] For further explanation, the lifting mechanism can be a crank type, a column type, or a scissor type. Of course, there are also other structural types of lifting structures that can be applied to the retractable projection screen of the present application, and no further examples will be given here. The control method of the lifting mechanism of the present application can be manual control or electric control.

[0097] Furthermore, the present application also includes a projection system, which includes the aforementioned projection screen and a projector that projects image light onto the projection screen. The projection screen includes a screen sheet 10, a support sheet, and a flexible lightweight material. The imaging display surface of the screen sheet faces the projector and the viewer. The image light emitted by the projector is incident on the screen sheet for imaging, and the imaging light exits from the screen surface into the visible range of the viewer to be received by the viewer.

[0098] Specifically, the projector can be any one of a long-focus projector, a short-focus projector, and an ultra-short-focus projector; the projector light source can be a laser light source, an LED light source, and the laser light source can be a single-color laser, a two-color laser, or a three-color laser.

[0099] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A retractable projection screen having a retracting axis direction, characterized in that, Comprising: A retractable screen, the screen comprising an imaging display surface; A plurality of support sheets, the support sheets being arranged on the opposite side of the imaging display surface of the screen, the extending direction of the support sheets being consistent with the winding axis direction, and the support sheets being arranged in parallel at intervals perpendicular to the winding axis direction; And a flexible lightweight material, the flexible lightweight material being arranged in the gaps between the support sheets; The density of the flexible lightweight material is not greater than 0.8 g / cm 3 , and the density of the material of the support sheet is not less than 1.3 g / cm 3 .

2. The projection screen according to claim 1, wherein The support sheet is a single-layer or multi-layer sheet material.

3. The projection screen according to claim 2, wherein, The support sheet comprises a fiber-reinforced material, and the fiber-reinforced material is at least one of glass fiber, carbon fiber, polyethylene fiber, aramid fiber and graphene fiber.

4. The projection screen according to claim 1, characterized in that, The cross-sectional shape of the support sheet is rectangular, triangular, trapezoidal or semi-circular.

5. The projection screen according to claim 1, wherein The material of the support sheet is polyethylene terephthalate, polymethyl methacrylate, polyethylene, polypropylene, polyvinyl chloride or polycarbonate.

6. The projection screen according to claim 1, characterized in that, The height of the support sheet is not greater than 5 mm, and the spacing between adjacent support sheets is not less than 1 mm.

7. The projection screen according to claim 1, characterized in that, The flexible lightweight material is a foaming material, and the foaming material is at least one of polyurethane foaming material, polyethylene foaming material, polystyrene foaming material, silicone foaming material, acrylic foaming material and phenolic resin foaming material.

8. The projection screen according to claim 1, characterized in that, The length of the support sheet is equal to the width of the screen, and the flexible lightweight material is filled in the intervals between adjacent support sheets.

9. The projection screen according to claim 8, characterized in that, The flexible lightweight material fills the opposite side of the imaging display surface of the screen.

10. The projection screen according to claim 1, characterized in that, The screen is a white plastic screen, a metal screen, a glass bead screen, a Fresnel screen or a wire grating screen.

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