Projection screen

Abstract

The present application discloses a projection screen, which belongs to the field of projection technology. The projection screen includes: a fixed frame, a curtain and a frame, the edge of the curtain wraps the fixed frame and is tightened and fixed on the fixed frame; the frame includes at least two sub-frames, the first end of each sub-frame is provided with a first plug-in structure and a second plug-in structure, and the second end of each sub-frame is provided with a third plug-in structure and a fourth plug-in structure. In the embodiment of the present application, the first plug-in structure and the second plug-in structure of the first sub-frame are abutted and fixed with the third plug-in structure and the fourth plug-in structure of the second sub-frame in the long side direction, the wide side direction and the thickness direction, which ensures the stability of the frame, avoids the distortion and deformation that may occur under the action of external force, and further avoids the possibility of distortion and deformation of the curtain, improves the picture display effect of the curtain, that is, improves the picture display effect of the projection screen.

Description

Technical Field

[0001] The present application relates to the field of projection technology, and in particular to a projection screen. Background Art

[0002] With the continuous development of science and technology, projection equipment is increasingly used in people's work and life. At present, projection equipment mainly includes an optical engine and a projection screen. Among them, the light outlet of the optical engine faces the projection screen to emit a light beam to the projection screen, and the projection screen is used to reflect the light beam to realize the display of the picture.

[0003] In the related art, the projection screen includes a screen, a fixed frame and a frame, wherein the screen is fixed on the fixed frame to fix the screen, and the frame is buckled on the edges of the screen and the fixed frame and is fixedly connected to the fixed frame. The frame includes four sub-frames with a U-shaped cross section, and the four sub-frames are fixedly connected end to end in sequence to obtain a rectangular frame.

[0004] However, in the related art, the ends of the four sub-frames are mainly fixedly connected by fixing members, and when the sub-frames are connected by fixing members, there will be installation gaps at the connection points, so that the frames are easily distorted under the action of external forces, thereby causing the screen to be distorted, etc. In this way, the picture displayed on the screen is distorted, which reduces the display effect of the projection screen. Summary of the invention

[0005] The present application provides a projection screen, which can prevent the frame in the projection screen from being distorted and deformed, thereby causing the screen to be distorted. The technical solution is as follows:

[0006] A projection screen, comprising:

[0007] Fixed frame;

[0008] A curtain, the edge of which wraps around the fixed frame and is tightened and fixed on the fixed frame, and the curtain is used to receive the light beam emitted by the optical engine to display a picture;

[0009] A frame, wherein the frame comprises at least two sub-frames, a first end portion of each sub-frame is provided with a first plug-in structure and a second plug-in structure, a second end portion of each sub-frame is provided with a third plug-in structure and a fourth plug-in structure, and the at least two sub-frames are plugged in sequence end to end based on the first plug-in structure, the second plug-in structure, the third plug-in structure and the fourth plug-in structure;

[0010] The first plug-in structure of the first sub-frame and the third plug-in structure of the second sub-frame are abutted and fixed in the long side direction and the wide side direction of the curtain, the second plug-in structure of the first sub-frame and the fourth plug-in structure of the second sub-frame are abutted and fixed in the thickness direction of the curtain, and the first sub-frame and the second sub-frame refer to any two sub-frames to be plugged in among the at least two sub-frames.

[0011] Optionally, each sub-frame includes a connecting plate and a side plate, the side plate is fixedly connected to the connecting plate, and the connecting plate surrounds the edge of the fixed frame, and the side plate is stacked on the fixed frame;

[0012] The first end of the connecting plate is formed with the first plug-in structure, the second end of the connecting plate is formed with the third plug-in structure, the first end of the side plate is formed with the second plug-in structure, and the second end of the side plate is formed with the fourth plug-in structure.

[0013] Optionally, the first plugging structure is a first plugging tongue, the third plugging structure is a slot, the first plugging tongue of the first connecting plate enters the slot of the second connecting plate, the end surface of the first plugging tongue of the first connecting plate abuts against the bottom surface of the slot of the second connecting plate, and the side wall of the first plugging tongue of the first connecting plate perpendicular to the thickness direction abuts against the side wall of the slot of the second connecting plate perpendicular to the thickness direction;

[0014] The second plug-in structure includes a second plug-in tongue and a first slot, the fourth plug-in structure includes a third plug-in tongue and a second slot, the second plug-in tongue of the first side plate abuts against a side wall of the second slot of the second side plate that is perpendicular to the thickness direction, and the third plug-in tongue of the second side plate abuts against a side wall of the first slot of the first side plate that is perpendicular to the thickness direction.

[0015] Optionally, the side panel is located on a side of the fixing frame away from the curtain.

[0016] Optionally, the number of the at least two sub-frames is two, and both sub-frames are L-shaped.

[0017] Optionally, the number of the at least two sub-frames is four, and the four sub-frames are all in a straight line shape.

[0018] Optionally, the curtain includes an optical film and a flexible cloth;

[0019] The optical film is bonded to the flexible cloth, the edge of the flexible cloth is folded from the first side of the fixed frame to the second side, and the edge of the flexible cloth is fixed to the second side of the fixed frame by an elastic tensioning member, and the inner wall of the frame is in gap contact with the flexible cloth.

[0020] Optionally, the elastic tensioning member is a tension spring, a first end of the tension spring is connected to an edge hook of the flexible cloth, and a second end of the tension spring is connected to a fixed structure hook on the second side of the fixed frame.

[0021] Optionally, a positioning hole is provided on the flexible cloth, and an edge of the optical film is aligned with the positioning hole.

[0022] Optionally, the flexible cloth is a rectangular structure, and the edges and corners of the flexible cloth are all chamfered.

[0023] The beneficial effects of the technical solution provided by this application may at least include:

[0024] Since the at least two sub-frames included in the frame are plugged in end to end in sequence, and for the first sub-frame and the second sub-frame plugged in the at least two sub-frames, the first plug-in structure of the first sub-frame and the third plug-in structure of the second sub-frame are abutted and fixed in the long side direction and the wide side direction of the screen, and the second plug-in structure of the first sub-frame and the fourth plug-in structure of the second sub-frame are abutted and fixed in the thickness direction of the screen, thereby achieving abutment and fixation in three directions: the long side direction, the wide side direction and the thickness direction, ensuring the stability of the frame, avoiding the distortion and deformation that may occur under the action of external force, and further avoiding the possibility of distortion and deformation of the screen, thereby improving the picture display effect of the screen, that is, improving the picture display effect of the projection screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 is a structural schematic diagram of a projection screen provided in an embodiment of the present application;

[0027] Figure 2 yes Figure 1 A schematic diagram of the local enlarged structure of area a in the middle;

[0028] Figure 3 is a structural schematic diagram of an end portion of a first sub-frame provided in an embodiment of the present application;

[0029] Figure 4 is a structural schematic diagram of an end portion of a second sub-frame provided in an embodiment of the present application;

[0030] Figure 5 It is a structural schematic diagram of a curtain provided in an embodiment of the present application;

[0031] Figure 6 is a structural schematic diagram of a partial cross section of a projection screen after contraction provided by an embodiment of the present application;

[0032] Figure 7 is a schematic diagram of a partial cross-sectional structure of a projection screen after expansion provided by an embodiment of the present application;

[0033] Figure 8 It is a structural schematic diagram of a projection screen provided in an embodiment of the present application.

[0034] Reference numerals:

[0035] 1: Fixed frame; 2: Curtain; 3: Frame;

[0036] 21: optical film; 22: flexible cloth; 23: elastic tensioning member;

[0037] 221: positioning hole;

[0038] 31: sub-frame; 32: first plug-in structure; 33: second plug-in structure; 34: third plug-in structure; 35: fourth plug-in structure;

[0039] 311: first sub-frame; 312: second sub-frame; 313: connecting plate; 314: side plate;

[0040] 321: first inserting tongue; 331: second inserting tongue; 332: first card slot; 34: slot; 351: third inserting tongue; 352: second card slot. DETAILED DESCRIPTION

[0041] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0042] Figure 1 A schematic diagram illustrating the structure of a projection screen according to an embodiment of the present application is shown. Figure 2 An example of a partial enlarged structural diagram of area a of a projection screen is shown. Figure 3 A schematic diagram of the mechanism of a first sub-frame in an embodiment of the present application is illustrated. Figure 4 The schematic diagram of the structure of a second sub-frame of an embodiment of the present application is illustrated. Figure 1 , Figure 2 , Figure 3As shown in Figure 4, the projection screen includes: a fixed frame 1, a curtain 2 and a frame 3; the edge of the curtain 2 wraps around the fixed frame 1 and is tightened and fixed on the fixed frame 1, and the curtain 2 is used to receive the light beam emitted by the optical engine to display the picture; the frame 3 includes at least two sub-frames 31, and the first end of each sub-frame 31 is provided with a first plug-in structure 32 and a second plug-in structure 33, and the second end of each sub-frame 31 is provided with a third plug-in structure 34 and a fourth plug-in structure 35, and at least two sub-frames 31 are plugged end to end based on the first plug-in structure 32, the second plug-in structure 33, the third plug-in structure 34 and the fourth plug-in structure 35.

[0043] The first plug-in structure 32 of the first sub-frame 311 and the third plug-in structure 34 of the second sub-frame 312 are both abutted and fixed in the long side direction and the wide side direction of the curtain 2, the second plug-in structure 33 of the first sub-frame 311 and the fourth plug-in structure 35 of the second sub-frame 312 are abutted and fixed in the thickness direction of the curtain 2, and the first sub-frame 311 and the second sub-frame 312 refer to any two sub-frames 31 to be plugged in among the at least two sub-frames 31.

[0044] In the embodiment of the present application, since the at least two sub-frames 31 included in the frame 3 are plugged in end to end in sequence, and for the first sub-frame 311 and the second sub-frame 312 plugged in the at least two sub-frames 31, the first plug-in structure 32 of the first sub-frame 311 and the third plug-in structure 34 of the second sub-frame 312 are abutted and fixed in the long side direction and the wide side direction of the curtain 2, and the second plug-in structure 33 of the first sub-frame 311 and the fourth plug-in structure 35 of the second sub-frame 312 are abutted and fixed in the thickness direction of the curtain 2, thereby achieving abutment and fixation in three directions: the long side direction, the wide side direction and the thickness direction, thereby ensuring the stability of the frame 3, avoiding the distortion and deformation that may occur under the action of external force, and further avoiding the possibility of distortion and deformation of the curtain 2, thereby improving the picture display effect of the curtain 2, that is, improving the picture display effect of the projection screen.

[0045] The shape of the fixed frame 1 can be rectangular, and the fixed frame 1 can be made of metal material to improve the structural stability of the fixed frame 1. In addition, the surface where the fixed frame 1 is located can be a plane, so that after the curtain 2 is tightened and fixed on the fixed frame 1, a plane picture display effect can be achieved.

[0046] Of course, the shape of the fixed frame 1 can be other shapes, as long as it is convenient to tighten and fix the curtain 2. The fixed frame 1 can also be made of materials other than metal, as long as the structural stability of the fixed frame 1 can be guaranteed. Furthermore, the surface where the fixed frame 1 is located can also be a curved surface with a certain curvature along the length direction, so as to achieve a curved picture display effect after the curtain 2 is tightened and fixed.

[0047] In some embodiments, the number of at least two sub-frames 31 can be two, and the shapes of the two sub-frames 31 can be the same, and both are L-shaped, so that a rectangular frame 3 can be obtained by plugging two L-shaped sub-frames 31 together.

[0048] Of course, the shapes of the two sub-frames 31 can also be different, wherein the first sub-frame 311 can be in a gate-shaped structure, and the second sub-frame 312 can be in a straight line shape. At this time, in order to facilitate the plugging of the two ends of the first sub-frame 311 with the two ends of the second sub-frame 312, the sub-frame 31 can be made of a material with a certain elastic deformation, so that the distance between the two ends of the first sub-frame 311 can be expanded under the action of an external force, and then the second sub-frame 312 can be placed between the two ends of the first sub-frame 311, thereby achieving the end-to-end plugging and fixing of the first sub-frame 311 and the second sub-frame 312.

[0049] In other embodiments, the number of at least two sub-frames 31 is four, in which case the four sub-frames 31 are all in a straight line shape, and there are a first pair of sub-frames 31 and a second pair of sub-frames 31 of equal length among the four sub-frames 31, so that a frame 3 with a rectangular structure can be obtained by plugging the first pair of sub-frames 31 and the second pair of sub-frames 31.

[0050] It should be noted that each sub-frame 31 can undergo elastic deformation under the action of external force, so that after three sub-frames 31 are plugged in and fixed, the distance between the two ends to be plugged in can be expanded under the action of external force to facilitate the plugging of the last sub-frame.

[0051] In some embodiments, Figure 2 As shown, each sub-frame 31 may include a connecting plate 313 and a side plate 314, the side plate 314 is fixedly connected to the connecting plate 313, and the connecting plate 313 surrounds the edge of the fixed frame 1, and the side plate 314 is stacked on the fixed frame 1; the first end of the connecting plate 313 forms a first plug-in structure 32, the second end of the connecting plate 313 forms a third plug-in structure 34, the first end of the side plate 314 forms a second plug-in structure 33, and the second end of the side plate 314 forms a fourth plug-in structure 35.

[0052] Among them, since a plug-in structure needs to be provided at the end of the side panel 314, the side panel 314 has a certain width. At this time, in order to avoid affecting the overall appearance of the projection screen, the side panel 314 can be located on the side of the fixed frame 1 away from the curtain 2, that is, the side panel 314 can be arranged on the back side of the curtain 2 to ensure the aesthetics of the projection screen.

[0053] It should be noted that a bent plate is formed on the edge of the connecting plate 313 away from the side plate 314, that is, the edges of the fixed frame 1 and the curtain 2 are clamped between the bent plate and the side plate 314, so that the frame 3 is integrally fixed to the fixed frame 1 and the curtain 2 through the side plate 314 and the bent plate.

[0054] In some embodiments, see Figure 3 and Figure 4 The first plug-in structure 32 may be a first plug-in tongue 321, and the third plug-in structure may be a slot 34. The first plug-in tongue 321 of the first connecting plate 313 enters the slot 34 of the second connecting plate 313, and the end surface of the first plug-in tongue 321 of the first connecting plate 313 abuts against the bottom surface of the slot 34 of the second connecting plate 313, and the side wall of the first plug-in tongue 321 of the first connecting plate 313 perpendicular to the thickness direction abuts against the side wall of the slot 34 of the second connecting plate 313 perpendicular to the thickness direction.

[0055] The first connecting plate 313 refers to the connecting plate 313 included in the first sub-frame, and the second connecting plate 313 refers to the connecting plate 313 included in the second sub-frame 312. Since the end surface of the first plug tongue 321 of the first connecting plate 313 abuts against the bottom surface of the slot 34 of the second connecting plate 313, the frame 3 can be fixed in the extension direction of the first plug tongue 321; since the side wall of the first plug tongue 321 of the first connecting plate 313 perpendicular to the thickness direction abuts against the side wall of the slot 34 of the second connecting plate 313 perpendicular to the thickness direction, the frame 3 can be fixed in the direction perpendicular to the extension direction of the first plug tongue 321 in the plane where the frame 3 is located, thereby realizing the fixation in two directions perpendicular to each other in the plane where the frame 3 is located.

[0056] It should be noted that the side wall on the first plug tongue 321 of the first connecting plate 313 that is perpendicular to the thickness direction may refer to the side wall away from the center, or may refer to the side wall close to the center, as long as the frame 3 can be fixed in a direction perpendicular to the extension direction of the first plug tongue 321 within the plane where the frame 3 is located, and the embodiment of the present application does not limit this.

[0057] The first plug tongue 321 of the first connecting plate 313 and the slot 34 of the second connecting plate 313 may be interference fit to achieve fixation in two directions. Furthermore, an adhesive may be applied to the first plug tongue 321 of the first connecting plate 313 to improve the firmness and stability of the fixation between the first plug tongue 321 of the first connecting plate 313 and the slot 34 of the second connecting plate 313 on the basis of interference fit. The extension direction of the first plug tongue 321 on the first connecting plate 313 may be the length direction of the first connecting plate 313, and accordingly, the depth direction of the slot 34 on the second connecting plate 313 may be perpendicular to the length direction of the second connecting plate 313; of course, the extension direction of the first plug tongue 321 on the first connecting plate 313 may also be perpendicular to the length direction of the first connecting plate 313, and the depth direction of the slot 34 on the corresponding second connecting plate 313 is the length direction of the second connecting plate 313.

[0058] In some embodiments, see Figure 3 and Figure 4 The second plug-in structure 33 includes a second plug-in tongue 331 and a first slot 332, the fourth plug-in structure 35 includes a third plug-in tongue 351 and a second slot 352, the second plug-in tongue 331 of the first side plate 314 abuts against the side wall of the third plug-in tongue 351 of the second side plate 314 that is perpendicular to the thickness direction, and the first slot 332 of the second side plate 314 abuts against the side wall of the second slot 352 of the first side plate 314 that is perpendicular to the thickness direction.

[0059] The first side plate 314 refers to the side plate 314 included in the first sub-panel frame, and the second side plate 314 refers to the side plate 314 included in the second sub-frame 312. Since the second plug tongue 331 of the first side plate 314 abuts against the side wall of the third plug tongue 351 of the second side plate 314 that is perpendicular to the thickness direction, and the first clamping groove 332 of the second side plate 314 abuts against the side wall of the second clamping groove 352 of the first side plate 314 that is perpendicular to the thickness direction, the frame 3 can be fixed in the thickness direction through the dual action between the second plug tongue 331 and the third plug tongue 351, and between the first clamping groove 332 and the second clamping groove 352.

[0060] It should be noted that both ends of the first side plate 314 and both ends of the second side plate 314 can be set to 45 degrees chamfer. Of course, the first end of the first side plate 314 is set to a 30-degree chamfer, and the second end of the second side plate 314 is set to a 60-degree chamfer, that is, as long as the first end of the first side plate 314 and the second end of the second side plate 314 can fully match and achieve plug-in fixation, the embodiment of the application does not limit this.

[0061] In the embodiment of the present application, for each sub-frame 31, after the end-to-end plugging of at least two sub-frames 31 is achieved through the first plug-in mechanism, the second plug-in structure 33, the third plug-in mechanism and the fourth plug-in structure 35, in order to ensure the stability of the connection between the two plugged sub-frames 31, the frame 3 also includes a fixing member and a plurality of fixing screws corresponding to the fixing member. In this way, one end of the fixing member can be fixed to the first sub-frame 311 through at least one first fixing screw among the plurality of fixing screws, and the other end of the fixing member can be fixed to the second sub-frame 312 through at least one second fixing screw among the plurality of fixing screws, so as to achieve a further fixed connection between the first sub-frame 311 and the second sub-frame 312.

[0062] The fixing member may be an 8-shaped structure or an L-shaped structure, or other structures, as long as the first sub-frame 311 and the second sub-frame 312 can be connected simultaneously through the fixing member. The embodiment of the present application does not limit this.

[0063] Next, the structure and fixing method of the curtain 2 are introduced.

[0064] In some embodiments, Figure 5 As shown, the curtain 2 may include an optical film 21 and a flexible cloth 22; the optical film 21 is bonded to the flexible cloth 22, the edge of the flexible cloth 22 is folded from the first side of the fixed frame 1 to the second side, and the edge of the flexible cloth 22 is fixed to the second side of the fixed frame 1 by an elastic tensioning member 23, and the inner wall of the frame 3 is in contact with the gap between the flexible cloth 22.

[0065] In this way, Figure 6 As shown, when the optical film 21 shrinks in a low temperature environment, a shrinkage force toward the center point can be generated, thereby driving the flexible cloth 22 to shrink synchronously. Since the edge of the flexible cloth 22 is connected to the second side of the fixed frame 1 through the elastic tensioning member 23, a stretching effect can be exerted on the elastic tensioning member 23. In this way, during the slow extension of the elastic tensioning member 23, it is ensured that the optical film 21 and the flexible cloth 22 shrink uniformly toward the center and remain flat at the same time, that is, the possibility of distortion and deformation of the optical film 21 due to local shrinkage is avoided. Figure 7As shown, when the optical film 21 expands in a high temperature environment, a contraction force away from the center point can be generated, thereby driving the flexible cloth 22 to expand synchronously. Since the edge of the flexible cloth 22 is connected to the second side of the fixed frame 1 through the elastic tensioning member 23, the optical film 21 and the flexible cloth 22 can be uniformly expanded in all directions under the slow tensioning action of the elastic tensioning member 23, and at the same time, a flat state can be maintained, that is, the possibility of distortion and deformation of the optical film 21 due to local expansion is avoided. In addition, when the optical film 21 and the flexible cloth 22 shrink, the elastic stretching member hinders the shrinkage of the optical film 21 and the flexible cloth 22, thereby reducing the shrinkage of the optical film 21. In this way, when the edge of the optical film 21 is wrapped by the frame 3, the width of the edge of the frame 3 on the plane where the optical film 21 is located can be appropriately reduced, that is, the width of the bent portion described above, thereby achieving the effect of removing the frame 3 of the projection screen.

[0066] It should be noted that, for the width of the bent portion on the frame 3, the maximum expansion dimension and the maximum contraction dimension within a certain temperature range can be simulated and calculated according to the linear expansion coefficient of the optical film 21 under the action of the elastic tensioning member 23, and then the width of the bent portion can be determined based on the maximum expansion dimension and the maximum contraction dimension. As long as the bent portion can cover the edge of the optical film 21 after the optical film 21 expands or contracts, the embodiments of the present application do not limit this.

[0067] The number of elastic tension members 23 can be 8, and each side of the flexible cloth 22 is correspondingly provided with two elastic tension members 23, and the two elastic tension members 23 are distributed at both ends of the corresponding side. The number of elastic tension members 23 can also be 12, and in this case, each side of the flexible cloth 22 is correspondingly provided with three elastic tension members 23, and the three elastic tension members 23 are distributed at both ends and the middle of the corresponding side. Of course, the number of elastic tension members 23 can also be other values, as long as the flexible cloth 22 can be tightened and fixed, and the embodiment of the present application does not limit this.

[0068] The optical film 21 can be made of plastic material, or other materials, as long as it can receive the light beam emitted by the optical engine and realize the display of the picture. The embodiment of the present application does not limit this. The thermal expansion coefficient of the optical film 21 is much higher than that of the fixed frame 1, so as to avoid the shrinkage of the fixed frame 1 being greater than the shrinkage of the optical film 21, resulting in wrinkles in the optical film 21.

[0069] The flexible cloth 22 can be a synthetic cloth, or a cloth made of other materials, as long as it can shrink or expand synchronously with the optical film 21. The embodiment of the present application does not limit this. The flexible cloth 22 can be a rectangular structure, and the edges and corners of the flexible cloth 22 are chamfered to avoid partial overlap of the edges of the flexible cloth 22 after being folded along the edges of the fixed frame 1, thereby increasing the overall thickness of the projection screen.

[0070] It should be noted that, in order to prevent the edge of the optical film 21 from touching the inner wall of the frame 3, when the optical film 21 is bonded to the flexible cloth 22, the size of the optical film 21 can be smaller than the size of the flexible cloth 22, so that it can be ensured that the optical film 21 is completely bonded to the area where the flexible cloth 22 is located, and a safety gap is reserved between the edge of the optical film 21 and the edge of the flexible cloth 22, that is, the minimum distance between the edge of the optical film 21 and the edge of the flexible cloth 22 is greater than the first distance value. Among them, the first distance value can be designed according to the width of the flexible cloth 22 folded from the first side of the fixed frame 1 to the second side, as long as it is ensured that the edge of the frame 3 including the optical film 21 will not contact the inner wall of the frame 3.

[0071] In addition, since there is a gap contact between the inner wall of the frame 3 and the flexible cloth 22, when the optical film 21 drives the flexible cloth 22 to shrink or expand synchronously, the flexible cloth 22 can slide unimpeded between the outer edge of the fixed frame 1 and the inner wall of the frame 3. Among them, the distance between the inner wall of the frame 3 and the flexible cloth 22 can be greater than the second distance threshold, and the second distance threshold can be designed according to the maximum expandable distance of the flexible cloth 22 in the thickness direction. For example, when the maximum expandable distance of the flexible cloth 22 in the thickness direction is 0.02mm, the second distance threshold can be 0.025mm. That is, as long as the second distance threshold is greater than the maximum expandable distance, the embodiment of the present application does not limit this.

[0072] Furthermore, in order to reduce the relative sliding resistance between the flexible cloth 22 and the fixed frame 1, a lubricating coating may be provided on the edge of the fixed frame 1. Such a lubricating coating can not only reduce friction, but also prevent the flexible cloth 22 from being worn after multiple frictions with the fixed frame 1.

[0073] In some embodiments, the elastic tensioning member 23 may be a tension spring, a first end of which is hooked to an edge of the flexible cloth 22 , and a second end of which is hooked to a fixed structure on a second side of the fixed frame 1 .

[0074] The fixing structure may be a fixing column, so that the second end of the tension spring can be hung on the fixing column to achieve a hook connection. Figure 6 or Figure 7As shown, the fixing structure may also be a hanging groove, so that the second end of the tension spring can be hung in the hanging groove to achieve a hook connection.

[0075] It should be noted that when the first end of the tension spring is connected to the flexible cloth 22, in order to avoid excessive local force on the flexible cloth 22, that is, stress concentration and resulting in rupture, the edge of the through hole on the flexible cloth 22 and the first end of the tension spring is wrapped with an eyelet, so that the force of the tension spring on the flexible cloth 22 is evenly distributed on the edge of the through hole through the eyelet, thereby avoiding the phenomenon of stress concentration.

[0076] In some embodiments, Figure 5 or Figure 8 As shown, a positioning hole 221 is provided on the flexible cloth 22 , and the edge of the optical film 21 is aligned with the positioning hole 221 .

[0077] Among them, Figure 5 As shown, a pair of positioning holes 221 are provided at each corner position of the flexible cloth 22, so as to position the corresponding corners on the optical film 21 through the pair of positioning holes 221, thereby ensuring that the normal center line of the optical film 21 coincides with the normal center line of the flexible cloth 22, thereby ensuring the accuracy of the bonding position of the optical film 21.

[0078] In addition, after the flexible cloth 22 is bonded to the optical film 21, when the flexible cloth 22 is fixed to the fixed frame 1, as shown in FIG. Figure 8 As shown, the relative position of the flexible cloth 22 and the fixed frame 1 can be ensured based on the positioning holes 221 on the flexible cloth 22, and the normal center direction of the optical film 21 can be ensured to coincide with the normal center line of the fixed frame 1, so as to ensure that the image displayed on the entire projection screen is located in the exact center of the projection screen, thereby improving the image display effect of the projection screen. Since the normal center direction of the optical film 21 coincides with the normal center line of the fixed frame 1, the distance between the edge of the optical film 21 and the fixed frame 1 is more uniform, so that when setting the frame 3, the width of each side of the frame 3 can be ensured to be equal, so as to maximize the width of the overall smaller frame 3.

[0079] In the embodiment of the present application, for the first sub-frame and the second sub-frame to be plugged in at least two sub-frames, the first plugging structure of the first sub-frame and the third plugging structure of the second sub-frame are both abutted and fixed in the long side direction and the wide side direction of the screen, and the second plugging structure of the first sub-frame and the fourth plugging structure of the second sub-frame are abutted and fixed in the thickness direction of the screen, thereby achieving abutment and fixing in three directions: the long side direction, the wide side direction and the thickness direction, ensuring the stability of the frame, avoiding the possible distortion and deformation under the action of external force, and further avoiding the possibility of distortion and deformation of the screen, improving the picture display effect of the screen, that is, improving the picture display effect of the projection screen. In addition, because the optical film included in the screen is bonded to the flexible cloth, and the flexible cloth is elastically stretched on the fixed frame, when the optical film shrinks, the shrinking size of the optical film can be reduced by the elastic stretching member, thereby reducing the side size of the frame, achieving the effect of an ultra-narrow frame, and improving the aesthetics of the projection screen.

[0080] The above description is only an illustrative embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A projection screen, characterized in that: The projection screen comprises: Fixed frame; A curtain, the edge of which wraps around the fixed frame and is tightened and fixed on the fixed frame, and the curtain is used to receive the light beam emitted by the optical engine to display a picture; A frame, wherein the frame comprises at least two sub-frames, a first end portion of each sub-frame is provided with a first plug-in structure and a second plug-in structure, a second end portion of each sub-frame is provided with a third plug-in structure and a fourth plug-in structure, and the at least two sub-frames are plugged in sequence end to end based on the first plug-in structure, the second plug-in structure, the third plug-in structure and the fourth plug-in structure; The first plug-in structure of the first sub-frame and the third plug-in structure of the second sub-frame are both abutted and fixed in the long side direction and the wide side direction of the screen, the second plug-in structure of the first sub-frame and the fourth plug-in structure of the second sub-frame are abutted and fixed in the thickness direction of the screen, and the first sub-frame and the second sub-frame refer to any two sub-frames to be plugged in among the at least two sub-frames; Wherein, each sub-frame includes a connecting plate and a side plate, the side plate is fixedly connected to the connecting plate, and the connecting plate surrounds the edge of the fixed frame, the side plates are stacked on the fixed frame, the connecting plate included in the first sub-frame is a first connecting plate, the side plate included in the first sub-frame is a first side plate, the connecting plate included in the second sub-frame is a second connecting plate, and the side plate included in the second sub-frame is a second side plate; The first end of the connecting plate is formed with the first plug-in structure, the second end of the connecting plate is formed with the third plug-in structure, the first end of the side plate is formed with the second plug-in structure, and the second end of the side plate is formed with the fourth plug-in structure; The second plug-in structure includes a second plug-in tongue and a first slot, the fourth plug-in structure includes a third plug-in tongue and a second slot, the second plug-in tongue of the first side plate abuts against a side wall of the second slot of the second side plate that is perpendicular to the thickness direction, and the third plug-in tongue of the second side plate abuts against a side wall of the first slot of the first side plate that is perpendicular to the thickness direction, so as to fix the frame in the thickness direction.

2. The projection screen according to claim 1, characterized in that The side plate is located on a side of the fixed frame away from the curtain; The first plug-in structure is a first plug-in tongue, and the third plug-in structure is a slot. The first plug-in tongue of the first connecting plate enters the slot of the second connecting plate, and the end surface of the first plug-in tongue of the first connecting plate abuts against the bottom surface of the slot of the second connecting plate, and the side wall of the first plug-in tongue of the first connecting plate that is perpendicular to the thickness direction abuts against the side wall of the slot of the second connecting plate that is perpendicular to the thickness direction.

3. The projection screen according to claim 1, characterized in that: The number of the at least two sub-frames is two, and both sub-frames are L-shaped.

4. The projection screen according to claim 1, characterized in that: The number of the at least two sub-frames is four, and the four sub-frames are all in a straight line shape.

5. The projection screen according to any one of claims 1 to 4, characterized in that: The curtain includes an optical film and a flexible cloth; The optical film is bonded to the flexible cloth, the edge of the flexible cloth is folded from the first side of the fixed frame to the second side, and the edge of the flexible cloth is fixed to the second side of the fixed frame by an elastic tensioning member, and the inner wall of the frame is in gap contact with the flexible cloth.

6. The projection screen according to claim 5, characterized in that The elastic tensioning member is a tension spring, a first end of the tension spring is connected to an edge hook of the flexible cloth, and a second end of the tension spring is connected to a fixed structure hook on the second side of the fixed frame.

7. The projection screen according to claim 6, characterized in that The flexible cloth is provided with a positioning hole, and the edge of the optical film is aligned with the positioning hole.

8. The projection screen according to claim 5, characterized in that: The flexible cloth is a rectangular structure, and the edges and corners of the flexible cloth are all chamfered.

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