CN215932355U

CN215932355U - Projection screen

Info

Publication number: CN215932355U
Application number: CN202122472458.5U
Authority: CN
Inventors: 代琪; 逄相来; 杨长明
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2021-10-14
Filing date: 2021-10-14
Publication date: 2022-03-01
Anticipated expiration: 2031-10-14

Abstract

The application discloses projection screen belongs to projection technical field. The projection screen includes: the device comprises a first frame, a second frame, a flexible carrier and a curtain sheet. Because the second sheet structure in the second frame has the curtain protection structure on the side away from the first sheet structure, after the curtain expands due to heating, the edge part of the curtain will contact with the curtain protection structure first, and then the edge part of the curtain will slide on the curtain protection structure along the direction away from the first frame. Therefore, the side surface of the curtain sheet can not be in contact with the first frame and the second frame, and the bad phenomenon of bulging at the edge part of the curtain sheet can be effectively avoided. When the curtain sheet is cooled and shrunk, the edge part of the curtain sheet is not contacted with the first frame and the second frame, namely, the edge part of the curtain sheet can be shrunk on the flexible carrier normally. Thereby effectively avoiding the bad phenomenon of degumming at the edge part of the curtain sheet.

Description

Projection screen

Technical Field

The application relates to the technical field of projection, in particular to a projection screen.

Background

With the continuous development of science and technology, projection devices are increasingly applied to the work and life of consumers. At present, a projection device mainly comprises a projection host and a projection screen. The light outlet of the projection host faces the projection screen to emit light beams to the projection screen, and the projection screen is used for receiving the light beams to realize the display of pictures.

Projection screens generally include: a flexible curtain and a frame. Wherein, flexible curtain can include: flexible supports (e.g., synthetic sheets), curtains, and adhesive films. The curtain piece can bond in one side of flexible carrier through the glued membrane, and the edge of flexible carrier stretches out four sides of curtain piece, and the opposite side of flexible carrier can laminate in the front of frame, and the edge of flexible carrier turns over the edge of turning over in order to wrap up the frame. In this manner, the flexible curtain can be secured to the frame.

However, after the screen is bonded to the flexible carrier, the screen is easily expanded with heat and contracted with cold, which causes the edge of the screen to be easily degummed or bulged, and further causes the display effect of the projection image displayed on the projection screen in the edge area to be poor.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a projection screen. The problem that the display effect of a projection picture displayed on a projection screen in the prior art in an edge area is poor can be solved, and the technical scheme is as follows:

there is provided a projection screen comprising:

the flexible carrier comprises a first frame, a second frame, a flexible carrier and a curtain sheet;

the flexible carrier is attached to the front face of the first frame, and the edge part of the flexible carrier is folded to wrap the edge of the first frame;

the curtain sheet is connected with one surface of the flexible carrier, which is far away from the first frame;

the second frame includes: the curtain comprises a first sheet-shaped structure and a second sheet-shaped structure which are connected with each other, wherein the first sheet-shaped structure is connected with one side of the first frame, which is far away from the curtain, the second sheet-shaped structure covers the side face of a component composed of the first frame and the flexible carrier, and one side of the second sheet-shaped structure, which is far away from the first sheet-shaped structure, is provided with a curtain protection structure;

wherein after the curtain sheet expands when heated, the edge part of the curtain sheet can slide on the curtain sheet protection structure

The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:

a projection screen, comprising: the device comprises a first frame, a second frame, a flexible carrier and a curtain sheet. Because the second sheet structure in the second frame has the curtain protection structure on the side away from the first sheet structure, after the curtain expands due to heating, the edge part of the curtain will contact with the curtain protection structure first, and then the edge part of the curtain will slide on the curtain protection structure along the direction away from the first frame. Therefore, the side surface of the curtain sheet can not be in contact with the first frame and the second frame, and the bad phenomenon of bulging at the edge part of the curtain sheet can be effectively avoided. When the curtain sheet is cooled and shrunk, the edge part of the curtain sheet is not contacted with the first frame and the second frame, namely, the edge part of the curtain sheet can be shrunk on the flexible carrier normally. Thereby effectively avoiding the bad phenomenon of degumming at the edge part of the curtain sheet.

Drawings

In order to more clearly illustrate the technical solutions in 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 based on these drawings without creative efforts.

Fig. 1 is a schematic view of a partial structure of a projection screen provided in the related art;

FIG. 2 is a diagram illustrating the effect of the phenomenon of de-bonding of the screen in the projection screen shown in FIG. 1;

FIG. 3 is a diagram illustrating the effect of the curtain from bulging in the projection screen shown in FIG. 1;

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

FIG. 5 is an enlarged partial schematic view of FIG. 4 at A';

FIG. 6 is a diagram of the effect of the projection screen shown in FIG. 4 when the screen is inflated;

FIG. 7 is a schematic diagram illustrating a partial structure of another projection screen provided in an embodiment of the present application;

FIG. 8 is an enlarged partial schematic view of FIG. 7 at B';

FIG. 9 is a diagram of the effect of the projection screen shown in FIG. 7 when the screen is inflated;

FIG. 10 is a schematic view of a partial structure of another projection screen provided in an embodiment of the present application;

FIG. 11 is an enlarged partial schematic view of FIG. 10 at C';

FIG. 12 is a schematic view of a flexible carrier and a curtain provided by an embodiment of the present application;

fig. 13 is a schematic structural diagram of a first frame according to an embodiment of the present disclosure.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

In the related art, please refer to fig. 1, in which fig. 1 is a schematic diagram illustrating a partial structure of a projection screen provided in the related art. Projection screen 00 generally includes: a flexible curtain 10, a first frame 20, and a second frame 30. The first frame 20 may be generally referred to as an inner frame, and the second frame 30 may be generally referred to as an outer frame.

The flexible curtain 10 may include: a flexible carrier 11 (e.g. a synthetic cloth), a curtain sheet 12 and an adhesive film 13. The curtain sheet 12 may be adhered to one side of the flexible carrier 11 by an adhesive film 13, and the edge of the flexible carrier 11 extends out of four sides of the curtain sheet 12. The other side of the flexible carrier 11 may be attached to the front surface of the first frame 20, and the edge portion of the flexible carrier 11 is folded to wrap the edge of the first frame 20. In this manner, the flexible curtain 10 can be secured to the first frame 20.

The second frame 30 may include: a fixing piece 31 and a shielding piece 32 connected to each other. Wherein, the fixing sheet 31 can be fixedly connected with the back surface of the first frame 20, and the shielding sheet 32 can cover the edge portion of the curtain sheet 12 in the flexible curtain 10.

However, after the screen 12 is bonded to the flexible carrier 11, the screen 12 is likely to expand with heat and contract with cold, which causes the edge of the screen to be easily degummed or bulge.

For example, referring to fig. 2, fig. 2 is a diagram illustrating the effect of the phenomenon of de-bonding of the screen in the projection screen shown in fig. 1. When the curtain sheet 12 is shrunk due to cooling, the edge portion of the curtain sheet 12 is easily separated from the shielding sheet 32 of the second frame 30. After the curtain sheet 12 is separated from the shielding sheet 32, the side surface of the curtain sheet 12 is easily contacted with the side surface of the shielding sheet 32, and at this time, if the curtain sheet 12 expands due to heat, the curtain sheet 12 does not expand into the shielding sheet 32, but expands out of the shielding sheet 32. Thus, the part of the curtain sheet 12 that is pulled out from the shielding sheet 32 cannot re-enter the shielding sheet 32 by expansion, but contacts the side of the shielding sheet 32 away from the flexible carrier 11, and the part of the curtain sheet 12 that is pulled out from the shielding sheet 32 is supported by the shielding sheet 32. Thus, the horizontal distance between the area of the curtain sheet 12 in contact with the shielding sheet 32 and the flexible carrier 11 is L1, which is much larger than the thickness of the curtain sheet 12, resulting in a large moment applied to the area of the curtain sheet 12 in contact with the shielding sheet 32, and further causing the edge of the curtain sheet 12 to be easily degummed.

Referring to fig. 3, fig. 3 is a diagram illustrating the effect of the curtain sheet of the projection screen shown in fig. 1 being bulged. When the curtain sheet 12 expands due to heat, the side of the curtain sheet 12 contacts the inner side of the second frame 30 facing the curtain sheet 12, which causes the edge of the curtain sheet 12 to bulge.

In the projection screen 00, the poor display effect of the projection image displayed on the screen 12 in the edge area is poor regardless of the poor phenomenon that the screen 12 is degummed or the poor phenomenon that the screen 12 is swelled.

Referring to fig. 4 and fig. 5, fig. 4 is a schematic partial structure diagram of a projection screen according to an embodiment of the present application, and fig. 5 is a schematic partial enlarged view of fig. 4 at a'. Projection screen 000 may include: a first frame 100, a second frame 200, a flexible carrier 300, and a curtain sheet 400.

The flexible carrier 300 in the projection screen 000 may be attached to the front surface of the first frame 100, and the edge portion of the flexible carrier 300 is folded to wrap the edge of the first frame 100.

The screen 400 in the projection screen 000 is connected to the side of the flexible carrier 300 away from the first frame 100. The curtain 400 may be an optical film, and the optical film is used in cooperation with a projection host. The projection host is used for emitting light beams to the optical diaphragm, and the optical diaphragm is used for receiving and reflecting the light beams to display pictures. The curtain sheet 400 may be secured to the flexible carrier 300 by means of an adhesive. For example, the curtain sheet 400 and the flexible carrier 300 may be bonded by an adhesive film. The flexible carrier 300 may be a flexible fabric such as a synthetic fabric, or may be another flexible member as long as it can be bent at will and has a certain flatness after being tensioned, which is not limited in this application. It should be noted that the projection of the flexible carrier 300 on the plane where the curtain sheet 400 is located covers the curtain sheet 400 or covers four side edges of the curtain sheet 400, so as to ensure that the edges of the flexible carrier 300 extend out of the four side edges of the curtain sheet 400, and further ensure the flatness of the curtain sheet 400 while tensioning the flexible carrier 300.

The second frame 200 in the projection screen 000 may include: a first sheet-like structure 201 and a second sheet-like structure 202 connected to each other. Wherein, the first sheet-like structure 201 can be connected with a side of the first frame 100 away from the curtain sheet 400. The second sheet structure 202 may cover side a of the component composed of the first frame 100 and the flexible carrier 300, and a side of the second sheet structure 202 away from the first sheet structure 201 may have a curtain protection structure 2021. Wherein, after the curtain sheet 400 expands due to heat, the edge portion of the curtain sheet 400 can slide on the curtain sheet protection structure 2021. It should be noted that the first sheet-like structure 201 and the second sheet-like structure 202 may be directly connected, or may be switched by the third sheet-like structure 203, that is, the first sheet-like structure 201 and the second sheet-like structure 202 may be connected by the third sheet-like structure 203.

For example, referring to fig. 6, fig. 6 is a diagram illustrating an effect when a screen in the projection screen shown in fig. 4 is expanded. Since the side of the second sheet-shaped structure 202 away from the first sheet-shaped structure 201 may have the curtain protection structure 2021, after the curtain 400 expands due to heat, the edge portion of the curtain 400 contacts the curtain protection structure 2021 first, and then the edge portion of the curtain 400 slides on the curtain protection structure 2021 along the direction away from the first frame 100. Therefore, the side surface of the curtain sheet 400 does not contact with the first frame 100 or the second frame 200, and the undesirable phenomenon of bulging at the edge portion of the curtain sheet 400 can be effectively avoided. When the curtain sheet 400 is shrunk due to cold, the edge portion of the curtain sheet 400 does not contact the first frame 100 and does not contact the second frame 200, i.e. the edge portion of the curtain sheet 400 can shrink on the flexible carrier 300 normally. Thereby effectively avoiding the poor degumming phenomenon at the edge part of the curtain sheet 400.

In summary, the projection screen provided in the embodiment of the present application includes: the device comprises a first frame, a second frame, a flexible carrier and a curtain sheet. Because the second sheet structure in the second frame has the curtain protection structure on the side away from the first sheet structure, after the curtain expands due to heating, the edge part of the curtain will contact with the curtain protection structure first, and then the edge part of the curtain will slide on the curtain protection structure along the direction away from the first frame. Therefore, the side surface of the curtain sheet can not be in contact with the first frame and the second frame, and the bad phenomenon of bulging at the edge part of the curtain sheet can be effectively avoided. When the curtain sheet is cooled and shrunk, the edge part of the curtain sheet is not contacted with the first frame and the second frame, namely, the edge part of the curtain sheet can be shrunk on the flexible carrier normally. Thereby effectively avoiding the bad phenomenon of degumming at the edge part of the curtain sheet.

In the embodiment of the present application, there are various positional relationships between the end surface B of the curtain protection structure 2021 away from the second sheet-like structure 202 and the bottom surface C of the curtain 400, and the structure of the curtain protection structure 2021 under different positional relationships is also different, and for this reason, the following two alternative implementations are schematically illustrated in the embodiment of the present application. The bottom surface C of the curtain sheet 400 is a surface of the curtain sheet 400 close to the flexible carrier 300, that is, a surface of the curtain sheet 400 for connecting with the flexible carrier 300.

Referring to fig. 7 and 8, fig. 7 is a partial structural schematic view of another projection screen provided in an embodiment of the present application, and fig. 8 is a partial enlarged schematic view of fig. 7 at B'. In the direction perpendicular to the curtain sheet 400 in the projection screen 000, the curtain sheet protection structure 2021 faces away from the end face B of the second sheet structure 202, and faces away from the first frame 100 in the projection screen 000 relative to the bottom face C of the curtain sheet 400.

For example, when the curtain sheet 400 expands due to heat, the edge portion of the bottom surface C of the curtain sheet 400 contacts the curtain protection structure 2021 first, and then the edge portion of the curtain sheet 400 slides on the curtain protection structure 2021 in a direction away from the first frame 100. Thus, it can be ensured that the edge portion of the curtain sheet 400 will contact the curtain sheet protection structure 2021 in the second frame 200 first, thereby reducing the probability that the side surface of the curtain sheet 400 contacts the region outside the curtain sheet protection structure 2021 in the second sheet-like structure 202, and further reducing the undesirable phenomenon of bulge at the edge portion of the curtain sheet 400.

In the embodiment of the present application, please refer to fig. 9, and fig. 9 is a diagram illustrating an effect of the projection screen shown in fig. 7 when the curtain sheet is expanded. The side of the curtain protection structure 201 close to the curtain 400 in the second sheet structure 202 may have a slope B1. The width of at least a portion of the curtain protection structure 2021 in the direction perpendicular to the curtain 400 gradually increases along the direction perpendicular to the first sheet-like structure 201 and away from the curtain 400. When the curtain sheet 400 expands due to heat, the edge of the curtain sheet 400 contacts the side of the inclined plane B1 first; then, the edge portion of the curtain sheet 400 slides on the slope B1 in a direction away from the first frame 100. Therefore, the side of the curtain sheet 400 does not contact the first frame 100, nor the second frame 200. In addition, the horizontal distance between the flexible carrier 200 and the contact area of the edge portion of the curtain sheet 400 with the slope B1 is L2, and the value of L2 is significantly smaller than that of L1. As such, the moment at the contact area of the edge portion of the curtain sheet 400 with the slope B1 is made smaller. Thus, the occurrence of the defect of the debonding at the edge portion of the curtain sheet 400 can be effectively prevented.

Alternatively, the side of the inclined surface B1 of the curtain protection structure 2021 near the curtain 400 away from the first frame 100 may have a rounded corner D. Thus, when the curtain sheet 400 expands, the edge portion of the curtain sheet 400 slides on the slope B1 in a direction away from the first frame 100. The bottom surface C of the edge portion of the curtain sheet 400 contacts the rounded corner D on the side of the inclined surface B1 away from the first frame 100. In this way, the probability that the bottom surface C of the edge portion of the curtain sheet 400 is scratched by the side edge of the inclined plane B1 away from the first frame 100 can be effectively reduced by the rounded corner D.

In the embodiment of the present application, referring to fig. 8, an included angle α between the inclined surface B1 of the curtain protection structure 2021 of the second sheet-like structure 202 near the curtain 400 and the target plane may range from 15 degrees to 30 degrees. Wherein the target plane may be a plane parallel to the curtain sheet 400. Thus, when the curtain sheet 400 expands due to heat and the edge portion of the curtain sheet 400 contacts the inclined surface B1, the supporting force of the inclined surface B1 on the curtain sheet 400 is small. Thus, the defect of degumming at the edge part of the curtain sheet 400 can be effectively prevented.

Referring to fig. 8, 10 and 11, fig. 10 is a schematic partial structure diagram of another projection screen provided in an embodiment of the present application, and fig. 11 is a schematic partial enlarged view of fig. 10 at C'. The end surface B2 of the curtain protection structure 2021 facing away from the second sheet structure 202 in the second sheet structure 202 may be coplanar with the bottom surface C of the curtain 400. For example, after the curtain sheet 400 expands due to heat, since the bottom surface C of the curtain sheet 400 is in coplanar contact with the end surface B2 of the curtain sheet protection structure 2021, the edge portion of the curtain sheet 400 slides on the curtain sheet protection structure 2021 in a direction away from the first frame 100. Therefore, the side surface of the curtain sheet 400 does not contact with the first frame 100 or the second frame 200, and the undesirable phenomenon of bulging at the edge portion of the curtain sheet 400 can be effectively avoided. When the curtain sheet 400 is shrunk due to cold, the edge portion of the curtain sheet 400 does not contact the first frame 100 and does not contact the second frame 200, i.e. the edge portion of the curtain sheet 400 can shrink on the flexible carrier 300 normally. Thereby effectively avoiding the poor degumming phenomenon at the edge part of the curtain sheet 400. In addition, the curtain protection structure 2021 can support the edge portion of the curtain 400, thereby ensuring the flatness of the edge portion of the curtain 400.

In the embodiment of the present application, a side of the curtain protection structure 2021 away from the second sheet structure 202 may have a convex circular arc surface B3. In this case, when the curtain sheet 300 expands due to heat, the edge portion of the curtain sheet 400 slides on the convex arc surface B3 of the curtain sheet protection structure 2021 more easily in a direction away from the first frame 100.

Alternatively, the orthographic projection of the curtain protection structure 2021 on the target plane may be within the orthographic projection of the curtain 400 on the target plane. Wherein the target plane may be a plane parallel to the curtain sheet 400. In this way, the edge portion of the curtain sheet 400 can shield the second frame 200, and thus can perform a function of modifying the front surfaces of the first frame 100 and the second frame 200.

In the embodiment of the present application, the arc degree of the arc surface C2 on the side of the curtain protection structure 2021 away from the second sheet-like structure 202 ranges from 120 degrees to 180 degrees. In the present application, as shown in fig. 11, fig. 11 shows that the arc degree of the arc surface B3 on the side of the curtain protection structure 2021 away from the second sheet-like structure 202 is 180 degrees. Thus, even if the edge portion of the curtain sheet 400 is bent, when the edge portion of the curtain sheet 400 slides on the convex arc surface B3 of the curtain sheet protection structure 2021, the probability that the side of the curtain sheet protection structure 2021 away from the second sheet structure 202 scratches the bottom surface C of the curtain sheet 400 can be effectively reduced.

Optionally, please refer to fig. 12, and fig. 12 is a schematic diagram of a flexible carrier and a curtain sheet according to an embodiment of the present application. The bottom side C of the curtain sheet 400 in the projection screen 000 may have a central region C1 connected to the flexible carrier 300 and an edge region C2 located at the periphery of the central region. The projection screen 000 may further include a protective layer 500 located in an edge region C2 at the periphery of the central region C1. For example, the protective layer 500 may be a film layer made of optical glue, acrylic glue, or the like, which is not limited in this application.

In the embodiment of the present application, please refer to fig. 7 and 10, the projection screen 000 may further include: the tensioning mechanism 600. The tensioning mechanism 600 can adjust the tension of the flexible carrier 300, and thus the tension of the curtain sheet 400. One end of the tensioning mechanism 600 may be connected to an edge portion of the flexible carrier 300 and the other end of the tensioning mechanism 600 may be connected to the first frame 100.

By way of example, the tensioning mechanism 600 may include: a first tensioning mechanism 601 and a second tensioning mechanism (not shown). Wherein the first tensioning mechanism 601 can adjust the degree of tension of the flexible carrier 300 in the short side direction (e.g., Y-axis direction) of the flexible carrier 300; the second tightening mechanism can adjust the degree of tightening of the flexible carrier 300 in the long-side direction (for example, the Z-axis direction) of the flexible carrier 300.

The first tensioning mechanism 601 may include: a first tensioning member 6011 and a first support bar 6012. One end of the first tensioning member 6011 is connected to the first support bar 6012, and the other end of the first tensioning member 6011 is connected to the first frame 100. The first support bar 6012 is connected to an edge portion of the flexible carrier 300. For example, an edge portion of the flexible carrier 300 may have the receiving pocket E, i.e., the edge portion of the flexible carrier 300 may be folded over to the back of the first frame 100 to form the receiving pocket E. The receiving pocket E may have an opening (not shown), and one end of the first straining member 6011 may be connected to the first support rod 6012 through the opening. The first support rods 6012 are disposed in the receiving pockets E at positions corresponding to the borders of the first frame 100. In this way, the edge portion of the flexible carrier 300 is integrally supported by the first support bar 6012, and then the first support bar 6012 is tensioned by the first tensioning member 6011, so that the edge portion of the flexible carrier 300 is integrally tensioned by the first tensioning member 6011. Thereby guaranteed the taut homogeneity to flexible carrier 300, avoided flexible carrier 300 to appear the phenomenon of fold because of local tautness is great, and then can avoid appearing the phenomenon of fold with the curtain piece 400 of flexible carrier 300 laminating.

In an embodiment of the present application, the second tensioning mechanism may comprise: a second tension member and a second support bar. One end of the second tension member is connected to the second support bar, and the other end of the second tension member is connected to the first frame 100. The second support bar is connected to an edge portion of the flexible carrier 300. For example, an edge portion of the flexible carrier 300 may have the receiving pocket E, i.e., the edge portion of the flexible carrier 300 may be folded over to the back of the first frame 100 to form the receiving pocket E. The receiving pocket E may have an opening (not shown), and one end of the second tension member may be connected to the second support rod through the opening. The accommodating pockets E at the positions corresponding to the frames of the first frame 100 are provided with second support rods. The structure of the second tensioning mechanism can refer to the structure of the first tensioning mechanism 601. In this way, the edge portion of the flexible carrier 300 is integrally supported by the second support rod, and then the second support rod is tensioned by the second tensioning member, so that the integral tensioning of the edge portion of the flexible carrier 300 by the second tensioning member is realized. Thereby guaranteed the taut homogeneity to flexible carrier 300, avoided flexible carrier 300 to appear the phenomenon of fold because of local tautness is great, and then can avoid appearing the phenomenon of fold with the curtain piece 400 of flexible carrier 300 laminating.

Optionally, the first tensioning member 6011 and the second tensioning member may both be tension springs. In this application, the first tensioning member 6011 and the second tensioning member may also be in other tensioning structures, which is not limited in this application. For example, when the first tensioning member 6011 is an extension spring, one end of the extension spring may be connected to the first support rod 6012 through a hook, and the other end of the extension spring is connected to the first frame 100 through a hook. When the second tension member is an extension spring, one end of the extension spring may be connected to the second support rod through a hook, and the other end of the extension spring may be connected to the first frame 100 through a hook.

In the embodiment of the present application, please refer to fig. 13, and fig. 13 is a schematic structural diagram of a first frame provided in the embodiment of the present application. The first frame 100 in the projection screen 000 may include a plurality of bezels 101. For example, the first frame 100 may include four rims 101, and ends of two adjacent rims 101 of the four rims 101 may be connected to each other. Thus, the four frames 101 can constitute a rectangular frame.

Alternatively, the end portions of the plurality of rims 101 in the first frame 100 each have a cavity F. The first frame 100 may further include: the angle iron 102, a portion of the angle iron 102 may be located in the cavity F of one frame 101 of the two adjacent frames 101, and another portion of the angle iron 102 may be located in the cavity F of the other frame 101 of the two adjacent frames 101. The angle iron 102 is of a plane structure, the angle edge of the angle iron 102 is provided with a threaded hole, the end portions of two adjacent frames 101 are provided with through holes corresponding to the threaded holes, and therefore the through holes can be penetrated through fixing screws and screwed into the corresponding threaded holes to achieve fixed connection of the two adjacent frames 101, and further fixed connection of the frames 101 in the first frame 100 is achieved.

In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

The above description is intended to be exemplary only, and not to limit the present application, and any modifications, equivalents, improvements, etc. made within the spirit and scope of the present application are intended to be included therein.

Claims

1. A projection screen, comprising: the flexible carrier comprises a first frame, a second frame, a flexible carrier and a curtain sheet;

wherein the edge portion of the curtain sheet is capable of sliding over the curtain sheet protective structure after the curtain sheet expands upon heating.

2. The projection screen of claim 1 wherein the sheet guard structure faces away from the end face of the second sheet structure and faces away from the first frame relative to the bottom face of the sheet in a direction perpendicular to the sheet.

3. The projection screen of claim 2 wherein the side of the sheet guard structure adjacent to the sheet has a slope, and the width of at least a portion of the sheet guard structure in a direction perpendicular to the sheet increases in a direction perpendicular to the first sheet structure and away from the sheet.

4. The projection screen of claim 3 wherein the angle between the inclined surface and the target plane is in the range of 15 degrees to 30 degrees, the target plane being a plane parallel to the screen.

5. The projection screen of claim 1 wherein an end surface of the sheet guard structure facing away from the second sheet structure is coplanar with a bottom surface of the sheet.

6. The projection screen of claim 5 wherein the side of the sheet guard structure distal from the second sheet structure has a convex arc.

7. The projection screen of claim 6 wherein an orthographic projection of the screen protection structure on a target plane is within an orthographic projection of the screen on the target plane, the target plane being a plane parallel to the screen.

8. The projection screen of claim 6 wherein the arc of the arc surface ranges from 120 degrees to 180 degrees.

9. A projection screen according to any one of claims 1 to 8 wherein the bottom surface of the sheet has a central region attached to the flexible carrier and an edge region located peripherally to the central region, the projection screen further comprising: a protective layer located in the edge region.

10. A projection screen according to any one of claims 1 to 8 further comprising a tensioning mechanism, one end of the tensioning mechanism being connected to an edge portion of the flexible carrier and the other end being connected to the first frame.