Projection screen and projection device
By setting overlapping support strips on the back of the projection screen, the problem of creases and wrinkles on the screen when it is rolled up is solved, improving the display effect and service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- QINGDAO HISENSE LASER DISPLAY CO LTD
- Filing Date
- 2023-02-13
- Publication Date
- 2026-05-05
AI Technical Summary
When existing projection screens are rolled up, the screen is easily squeezed by the support strips, resulting in creases or wrinkles and poor display quality.
By setting multiple support strips on the back of the projection screen, overlapping areas are created between different layers of support strips to avoid excessive pressure on the screen when the support strips are completely misaligned, thus improving flatness.
It effectively avoids creases and wrinkles on the screen, improves the display effect, and extends the lifespan of the projection screen.
Smart Images
Figure CN116047853B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of projection technology, and in particular to a projection screen and projection device. Background Technology
[0002] A projection screen is a device used to receive images projected by a projector.
[0003] A projection screen includes a screen and a roll. One end of the screen is connected to the roll for easy storage on the roll. Multiple support strips are provided on the back of the screen. These multiple support strips are evenly arranged on the screen in a direction away from the roll to support the screen and prevent the screen from curling.
[0004] However, when the projection screen is rolled up, the screen is easily squeezed by the support strips, resulting in creases or wrinkles, which leads to poor display quality. Summary of the Invention
[0005] This application provides a projection screen and a projection device. The technical solution is as follows:
[0006] According to a first aspect of this application, a projection screen is provided, the projection screen comprising: a projection screen, a support assembly, and a roll assembly;
[0007] One end of the projection screen is connected to the roll assembly;
[0008] The support assembly includes multiple support bars located on the back of the projection screen. When the projection screen is unfolded, the multiple support bars are arranged on the back of the projection screen in a direction away from the roll assembly. When the projection screen is wound into multiple layers on the roll assembly, the nth layer of the multi-layer projection screen has at least a first support bar, and the (n+1)th layer of the projection screen has at least a second support bar. The orthographic projections of the first support bar on the nth layer of the projection screen and the orthographic projections of the second support bar on the nth layer of the projection screen have an overlapping area, where n≥1.
[0009] Optionally, the circumferential spacing between two adjacent support strips on the nth layer projection screen is smaller than the circumferential spacing between two adjacent support strips on the (n+1)th layer projection screen.
[0010] Optionally, among the multiple support strips on the nth layer of the projection screen, the spacing between any two adjacent support strips in the circumferential direction is equal.
[0011] Optionally, the plurality of support strips have the same width in the circumferential direction, and the overlapping area of the orthographic projection of the first support strip on the nth layer projection screen and the orthographic projection of the second support strip on the nth layer projection screen has a circumferential width greater than or equal to three-quarters of the width of the support strip.
[0012] Optionally, the width of the support strip on the nth projection screen in the circumferential direction is smaller than the width of the support strip on the (n+1)th projection screen in the circumferential direction.
[0013] Optionally, the widths of the multiple support strips on the nth layer projection screen are all equal in the circumferential direction.
[0014] Optionally, the circumferential spacing between two adjacent support strips on the nth layer of the projection screen is smaller than the circumferential spacing between two adjacent support strips on the (n+1)th layer of the projection screen.
[0015] Optionally, the support strip includes a rigid material layer and a flexible material layer, the rigid material layer being located on the back of the projection screen, and the flexible material layer being stacked on the side of the rigid material layer away from the projection screen;
[0016] Alternatively, the support assembly may further include a flexible layer that covers the plurality of support strips.
[0017] Optionally, the support strip is bonded to the projection screen;
[0018] Alternatively, the support assembly may further include a plurality of fixing structures located on the projection screen, with the support strip located on the fixing structures;
[0019] Alternatively, the projection screen may further include a cover layer, with the plurality of support strips located between the cover layer and the projection screen.
[0020] According to another aspect of the embodiments of this application, a projection device is provided, the projection device including a projector and the projection screen described above.
[0021] The beneficial effects of the technical solutions provided in this application include at least the following:
[0022] By configuring multiple support strips in the support assembly, when the projection screen is rolled and wound onto the roll assembly, the support strips on different layers of the multi-layer projection screen can overlap to a certain extent. This allows the support strips on different layers of the projection screen to support each other, preventing excessive pressure from being applied to the projection screen when the support strips on different layers are completely misaligned, which could cause indentations or wrinkles. This improves the flatness of the projection screen, solves the problem of poor display effect of projection screens in related technologies, and enhances the display effect of the projection screen. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is a schematic diagram of a projection screen;
[0025] Figure 2 This is a schematic diagram of another type of projection screen;
[0026] Figure 3 yes Figure 2 A schematic diagram of the projection screen wound on the roll;
[0027] Figure 4 yes Figure 3 A magnified structural diagram of a portion of the projection screen shown.
[0028] Figure 5 This is a schematic diagram of the structure of a projection screen provided in an embodiment of this application;
[0029] Figure 6 yes Figure 5 The diagram shows the projection screen in its stowed state.
[0030] Figure 7 yes Figure 6 A magnified schematic diagram of a portion of the projection screen shown;
[0031] Figure 8 This is a schematic diagram of another projection screen structure provided in an embodiment of this application;
[0032] Figure 9 yes Figure 8 A magnified schematic diagram of a portion of the projection screen shown;
[0033] Figure 10 This is a schematic diagram of another projection screen structure provided in an embodiment of this application;
[0034] Figure 11 This is a schematic diagram of another projection screen structure provided in an embodiment of this application;
[0035] Figure 12 yes Figure 11 A magnified schematic diagram of a portion of the projection screen shown;
[0036] Figure 13This is a schematic diagram of another projection screen structure provided in an embodiment of this application;
[0037] Figure 14 yes Figure 13 A magnified schematic diagram of a portion of the projection screen shown;
[0038] Figure 15 This is a schematic diagram of the structure of a projection device provided in an embodiment of this application.
[0039] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation
[0040] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.
[0041] A projection screen is a device used to receive images projected by a projector. To improve ease of use, some projection screens are now designed to be rolled up. For example... Figure 1 As shown, Figure 1 This is a schematic diagram of a projection screen, which includes a beam 11, a roller 12, and a flexible screen 13. The beam 11 is located at the upper edge of the screen 13, and the roller 12 is located at the lower edge of the screen 13. The roller 12 and the beam 11 can tighten the screen 13. The tension in all directions of the central area 131 of the screen 13 is basically equal, resulting in a high degree of flatness in the central area 131. However, the forces on the off-center areas of the screen 131 are not equal in different directions. In particular, there is no external force in the left and right edge areas 132, which leads to an imbalance of forces on the left and right sides of the edge areas 132. This imbalance can cause the screen to shrink inward, curl, and wrinkle, affecting the display effect of the projection screen.
[0042] To solve the problem of uneven edges on the screen, a projection screen can be like... Figure 2 As shown, Figure 2 This is a schematic diagram of another type of projection screen. Figure 2This is a schematic diagram of the projection screen in its unfolded state. The projection screen includes a screen 21, support strips 22, and a roll 23. One end of the screen 21 is connected to the roll 23 for easy winding and storage. Multiple support strips 22 can be evenly attached to the back of the screen 21 (the screen may include a front and a back side, with the front side being the side that carries the image) to support the screen 21, improve its flatness, and thus enhance the display effect of the projection screen. The spacing s1 between the multiple support strips 22 is equal.
[0043] Please refer to Figure 3 , Figure 3 yes Figure 2 A schematic diagram of the structure of the projection screen wound on the roll 23. Figure 4 yes Figure 3 The diagram shows an enlarged view of a portion of the projection screen. Figure 4 yes Figure 3 (See the enlarged structural diagram of region q1 in the middle region). Please refer to... Figure 3 and Figure 4 As can be seen, the screen 21 is wound into three layers on the roller 23. However, due to the different radii of the different layers of screen 21 during winding, a support strip 22a on the second layer of screen 21 and a support strip 22b on the third layer of screen 21 are completely misaligned. In this state, the support strip 22a will apply outward pressure to the third layer of screen 21, and the support strip 22b will apply inward pressure to the third layer of screen 21. These two pressures are in opposite directions and the positions of the pressures are close. This causes the support strips 22a and 22b to perform a shearing action on the second layer of screen 21 from both sides. This may cause irreparable creases and wrinkles on the screen 21, which will seriously affect the display effect of the projection screen and may even cause the screen 21 to break, resulting in a shorter lifespan for the projection screen.
[0044] This application provides a projection screen and a projection device, which can solve some problems existing in the above-mentioned related technologies.
[0045] Figure 5 This is a schematic diagram of the structure of a projection screen provided in an embodiment of this application. Figure 4 (This is a schematic diagram of the projection screen in its unfolded state.) Figure 6 yes Figure 5 The diagram shown illustrates the structure of the projection screen in its stowed state. Figure 7 yes Figure 6 The diagram shows an enlarged view of a portion of the projection screen. Figure 7 yes Figure 6 (A magnified structural diagram of region q2 in the middle region). Please refer to this diagram. Figure 5 , Figure 6 as well as Figure 7The projection screen 40 includes: a projection screen 41, a support assembly 42, and a roll assembly 43.
[0046] One end of the projection screen 41 is connected to the roll assembly 43.
[0047] The support assembly 42 includes multiple support bars t, which are located on the back of the projection screen 41. When the projection screen 41 is unfolded, the multiple support bars t are arranged on the back of the projection screen 41 in a direction f1 away from the roll assembly 43. The projection screen 41 is wound into multiple layers on the roll assembly 43. The nth layer of the multi-layer projection screen 41 is... n It has at least a first support bar t1, and an (n+1)th layer of projection screen 41 n+1 The upper part has at least a second support bar t2, and the first support bar t1 is on the nth layer of the projection screen 41. n The orthographic projection on the second support bar t2 on the nth layer projection screen 41 n The orthographic projections on the surface have overlapping regions, and n≥1.
[0048] The first support bar t1 is on the nth layer of the projection screen 41 n The orthographic projection on the second support bar t2 on the nth layer projection screen 41 n When there is an overlapping area in the orthographic projection on the nth projection screen 41, it indicates that the nth projection screen 41 n The first support bar t1 and the n+1 layers of projection screen 41 n+1 The second support bar t2 is not completely offset in the direction away from the axis z1 of the roll assembly 43. Therefore, in the retracted state, the support bars of different layers can support each other when the projection screen is compressed, avoiding the situation where... Figure 3 The support strips on different layers of the projection screen shown in the diagram address the issue of shearing the projection screen, reducing the risk of creases or wrinkles on the projection screen and protecting it.
[0049] In summary, the projection screen provided in this application embodiment, by setting multiple support strips in the support assembly, allows the support strips on different layers of the projection screen to overlap to a certain extent when the projection screen is rolled and wound onto the roll assembly. This allows the support strips on different layers of the projection screen to support each other, preventing excessive pressure from being applied to the projection screen when the support strips on different layers are completely misaligned, thus avoiding indentations or wrinkles. This improves the flatness of the projection screen, solves the problem of poor display effect in related technologies, and enhances the display quality of the projection screen.
[0050] In addition, since the support strips of different layers of the projection screen provided in this application embodiment can support each other when the projection screen is stored, the problem of the support strips on different layers of the projection screen cutting the projection screen will not occur, thereby reducing the risk of damage to the projection screen and improving the lifespan of the projection screen.
[0051] It should be noted that the projection screen provided in this application embodiment may include an unfolded state and a retracted state. The unfolded state refers to the state in which the projection screen 41 is not rolled up and wrapped around the roll assembly 43, and is unfolded outside the roll assembly 43. The retracted state refers to the state in which the projection screen 41 is rolled up and wrapped around the roll assembly 43. Of course, the projection screen 41 may also be partially rolled up and wrapped around the roll assembly 43, and this application embodiment does not impose any restrictions on this.
[0052] In the projection screen provided in this application embodiment, various structures can be used to make the orthographic projection of the first support bar on the nth layer projection screen overlap with the orthographic projection of the second support bar on the nth layer projection screen, which will be described below.
[0053] Figure 8 This is a schematic diagram of another projection screen structure provided in an embodiment of this application. Figure 8 The diagram shown is a structural schematic of the projection screen in its stowed state. Figure 9 yes Figure 8 The diagram shows an enlarged view of a portion of the projection screen. Figure 9 yes Figure 8 (See the enlarged structural diagram of region q3 in the projection screen shown). Please refer to... Figure 8 and Figure 9 Among them, the nth layer projection screen is 41 n The circumferential spacing d1 between two adjacent support bars t is less than 41 of the (n+1)th layer of the projection screen. n+1 The circumferential distance d2 between two adjacent support strips t. That is, when the projection screen is rolled up and wound on the roll assembly, the spacing between the support strips on the projection screen is positively correlated with the number of layers of the projection screen. On this basis, the spacing between the support strips on the outermost layers of the projection screen is larger.
[0054] In one exemplary embodiment, when the central angle n of different layers of projection screens is the same (the central angle can be defined as the angle between the position of the support strip on the projection screen and the vertical direction), the support strips t on different layers of projection screens can overlap. In this projection screen, the position of the axis z1 of the roll assembly 43 can be regarded as the center of the overall structure. Please refer to the formula for the central angle:
[0055] n = (180 × d) / (π × r);
[0056] Where n is the central angle, d is the distance between two adjacent support strips on the same layer of the projection screen (this distance is equal to the arc length), and r is the radius of the support strip. Since the radii of the support strips on different layers of the projection screen are different (the distance from z1 is different, and the difference in radius can be due to factors such as the thickness of the support strip and the thickness of the projection screen), if the distance d between the support strips on different layers of the projection screen is equal, and the width of the support strips is also equal, then according to the above formula for the central angle, the central angle n of the support strips on different layers of the projection screen will necessarily be different. Therefore, the support strips on different layers of the projection screen may have the following characteristics: Figure 4 The completely misaligned arrangement shown in the image caused problems such as creases and wrinkles on the projection screen.
[0057] In the projection screen provided in this embodiment, by making the nth layer projection screen 41 n The circumferential spacing d1 between two adjacent support bars t is less than 41 of the (n+1)th layer of the projection screen. n+1 The circumferential spacing d2 between the two adjacent support bars t is used to compensate for the (n+1)th layer of projection screen 41. n+1 The radius of the upper support bar and the nth layer of the projection screen 41 n The difference in radius of the support strip t allows the support strips on different layers of a multi-layer projection screen to overlap to a certain extent. Among them, the nth layer projection screen 41 n The circumferential spacing d1 between two adjacent support bars t is specifically greater than that of the (n+1)th layer of projection screen 41. n+1 How much smaller is the circumferential spacing d2 between the two adjacent support bars t? This can be based on actual parameters (e.g., based on the projection screen being in the retracted state, the n+1th layer of the projection screen 41). n+1 The radius of the upper support strip and the nth layer of the projection screen 41 n The difference between the radii of the support strips t is used to calculate the difference between the spacing d1 and d2. This calculation is performed using the difference between the radii of the support strips t. The specific details of this application will not be repeated here.
[0058] Figure 10 This is a schematic diagram of another projection screen structure provided in an embodiment of this application. Figure 10 yes Figure 8 (The diagram shown is a structural schematic of the projection screen in its unfolded state. Please refer to it.) Figure 9 as well as Figure 10 Among them, the nth layer projection screen is 41 nIn a projection screen with multiple support strips t, the circumferential spacing s2 between any two adjacent support strips is equal. That is, in a projection screen with multiple support strips, the circumferential spacing between any two adjacent support strips is equal. Of course, the circumferential spacing between any two adjacent support strips in the same projection screen may not be equal, and this embodiment does not impose any restrictions on this.
[0059] In one exemplary embodiment, the multiple support strips t have the same width in the circumferential direction, and the overlapping area of the orthographic projection of the first support strip t1 on the nth layer projection screen and the orthographic projection of the second support strip on the nth layer projection screen has a width in the circumferential direction that is greater than or equal to three-quarters of the width of the support strip. Figure 9 The diagram shows the overlapping area of the orthographic projection of the first support bar t1 on the nth layer of the projection screen and the orthographic projection of the second support bar on the nth layer of the projection screen, where the circumferential width is equal to the width of the support bar. However, this embodiment does not impose limitations on this. It should be noted that when the projection screen provided in this embodiment is in the unfolded state, the dimensions of the multiple support bars t in the direction f1 away from the roll assembly 43 (this dimension can be called the width of the support bar t (this width can be the actual width of the support bar)) can be the same, and consequently, the circumferential widths of these multiple support bars will also be the same. In an exemplary embodiment, the multiple support bars in the projection screen provided in this embodiment can be the same support bar.
[0060] Figure 11 This is a schematic diagram of another projection screen structure provided in an embodiment of this application. Figure 12 yes Figure 11 The diagram shows an enlarged view of a portion of the projection screen. Figure 12 yes Figure 11 (A magnified structural diagram of region q4 in the middle), where the nth layer projection screen 41 n The width of the support strip t3 in the circumferential direction is less than that of the (n+1)th layer of projection screen 41. n+1 The width of the support strip t4 in the circumferential direction. That is, when the projection screen is rolled up and wound on the roll assembly, the width of the support strip on the projection screen is positively correlated with the number of layers of the projection screen. On this basis, the outermost layers of the projection screen have larger support strips.
[0061] As can be seen from the above, since the radii of the support strips on different layers of projection screens are different, if the spacing d between the support strips on different layers of projection screens is equal, and the width of the support strips is also equal, then according to the above formula for central angle, the central angle n of the support strips on different layers of projection screens will necessarily not be the same. Figure 11 and Figure 12 In the projection screen shown, by making the nth projection screen 41 nThe width of the support strip t3 in the circumferential direction is less than that of the (n+1)th layer of projection screen 41. n+1 The width of the support strip t4 in the circumferential direction is used to compensate for the (n+1)th layer of projection screen 41. n+1 The radius of the upper support strip and the nth layer of the projection screen 41 n The difference in radius of the support strip t on the screen allows the support strips on different layers of the projection screen to overlap to a certain extent.
[0062] In one exemplary embodiment, the widths of the multiple support strips on the nth projection screen layer are all equal in the circumferential direction. That is, the widths of the multiple support strips on the same projection screen layer are equal. Of course, the widths of the multiple support strips on the same projection screen layer can also be unequal, and this embodiment does not limit this.
[0063] This application provides two schemes for allowing the support strips on different layers of a multi-layer projection screen to overlap to a certain extent. The projection screen provided in this application can apply at least one of these two schemes. For example, the above... Figure 11 In the projection screen shown, the circumferential spacing between two adjacent support bars on the nth layer of the projection screen can also be smaller than the circumferential spacing between two adjacent support bars on the (n+1)th layer of the projection screen.
[0064] In the projection screen provided in the above embodiments, the support strip can be set on the back of the projection screen in a variety of ways. For example, the support strip can be glued to the projection screen; or, the support component also includes multiple fixing structures located on the projection screen (the fixing structure can be a net, hook or buckle, etc.), and the support strip is located on the fixing structure; or, the projection screen also includes a cover layer, and multiple support strips are located between the cover layer and the projection screen. The cover layer can be attached to the area on the back of the projection screen that is not covered by the support strip, so as to fix the support strip to the back of the projection screen.
[0065] Figure 13 This is a schematic diagram of another projection screen structure provided in an embodiment of this application. Figure 14 yes Figure 13 The diagram shows an enlarged view of a portion of the projection screen. Figure 14 yes Figure 13 (Enlarged structural diagram of the central region q5), wherein the support strip t includes a rigid material layer c1 and a flexible material layer c2. The rigid material layer c1 is located on the back of the projection screen 41, and the flexible material layer c2 is stacked on the side of the rigid material layer c1 away from the projection screen 41. The rigid material layer c1 provides support for the support strip t, while the flexible material layer c2 prevents the rigid material layer c1 from directly contacting the front of the projection screen 41, thus enhancing the protection of the projection screen 41.
[0066] In addition, the projection screen can be protected in other ways. For example, the support assembly also includes a flexible layer that covers multiple support strips. This can also prevent the rigid material layer c1 from directly contacting the front of the projection screen 41, thus improving the protection of the projection screen 41.
[0067] In one exemplary embodiment, the projection screen provided in this application may further include a crossbeam, which may be located at the other end of the projection screen opposite to the roll assembly and may be used to support that end of the projection screen.
[0068] Furthermore, the projection screen provided in this application embodiment can be a pull-down projection screen or an pull-up projection screen. When the projection screen is a pull-down projection screen, after it is set in a preset position, the user can pull the projection screen out from the roll assembly from top to bottom. When the projection screen is a pull-up projection screen, after it is set in a preset position, the user can pull the projection screen out from the roll assembly from bottom to top. In this case, the pulled-out projection screen can be fixed in a preset position (such as a hook on the wall, or by fixing the projection screen and supporting structure layer with a bracket).
[0069] In summary, the projection screen provided in this application embodiment, by setting multiple support strips in the support assembly, allows the support strips on different layers of the projection screen to overlap to a certain extent when the projection screen is rolled and wound onto the roll assembly. This allows the support strips on different layers of the projection screen to support each other, preventing excessive pressure from being applied to the projection screen when the support strips on different layers are completely misaligned, thus avoiding indentations or wrinkles. This improves the flatness of the projection screen, solves the problem of poor display effect in related technologies, and enhances the display quality of the projection screen.
[0070] In addition, since the support strips of different layers of the projection screen provided in this application embodiment can support each other when the projection screen is stored, the problem of the support strips on different layers of the projection screen cutting the projection screen will not occur, thereby reducing the risk of damage to the projection screen and improving the lifespan of the projection screen.
[0071] like Figure 15 As shown, Figure 15 This is a schematic diagram of the structure of a projection device provided in an embodiment of this application. The projection device includes a projector 50 and any of the projection screens 40 provided in the above embodiments.
[0072] When using this projection device, the projection screen 41, which is rolled up and stored in the roll assembly 43, can be pulled out from the roll assembly 43 and fixed in place. Then, the projector 50 can be turned on, and the projector 50 can project the image onto the projection screen 41. Because the support strip t on the back of the projection screen 41 can improve the flatness of the projection screen 41, especially the flatness of the edges of the projection screen 41, it reduces the possibility of problems such as inward shrinkage, curling, and wrinkles at the edges of the projection screen 41. As a result, the image can be presented on a projection screen with higher flatness, thus improving the display effect of the image.
[0073] Furthermore, in normal application scenarios, the projection screen may be in a retracted state for extended periods, causing it to become rolled up and tangled in the roll assembly. If this is the case... Figure 3 and Figure 4 The structure of the projection screen shown indicates that the projection screen will develop obvious creases and wrinkles under the pressure of the support strips in different layers, and may even break. This will result in a poor display effect of the image projected onto the projection screen. However, the projection device provided in this application uses the projection screen provided in the above embodiment. When the rigid projection screen is rolled and wound onto the roll assembly, the support strips on different layers of the multi-layer projection screen can overlap to a certain extent. Thus, the support strips on different layers of the projection screen can support each other, so as to avoid excessive pressure being applied to the projection screen when the support strips on different layers are completely misaligned, which would cause the projection screen to have indentations or wrinkles. This improves the display effect and service life of the projection screen.
[0074] In one exemplary embodiment, the projector 40 can be an ultra-short-throw projector, which can shorten the distance between the projector 40 and the projection screen 30, making it easier to miniaturize the projection device.
[0075] In summary, the projection device provided in this application embodiment includes a projector and a projection screen. By setting multiple support strips in the support assembly, when the projection screen is rolled and wound onto the roll assembly, the support strips on different layers of the multi-layer projection screen can overlap to a certain extent. Thus, the support strips on different layers of the projection screen can support each other, avoiding excessive pressure on the projection screen when the support strips on different layers are completely misaligned, which would cause indentations or wrinkles on the projection screen. This improves the flatness of the projection screen, solves the problem of poor display effect of projection screens in related technologies, and improves the display effect of projection screens.
[0076] In addition, since the support strips of different layers of the projection screen provided in this application embodiment can support each other when the projection screen is stored, the problem of the support strips on different layers of the projection screen cutting the projection screen will not occur, thereby reducing the risk of damage to the projection screen and improving the lifespan of the projection screen.
[0077] In this application, the term "at least one of A and B" merely describes the relationship between related objects, indicating that three relationships can exist. For example, "at least one of A and B" can represent: A existing alone, A and B existing simultaneously, and B existing alone. Similarly, "at least one of A, B, and C" indicates that seven relationships can exist, representing: A existing alone, B existing alone, C existing alone, A and B existing simultaneously, A and C existing simultaneously, C and B existing simultaneously, and A, B, and C existing simultaneously. Likewise, "at least one of A, B, C, and D" indicates that fifteen relationships can exist, representing: A existing alone, B existing alone, C existing alone, D existing alone, A and B existing simultaneously, A and C existing simultaneously, A and D existing simultaneously, C and B existing simultaneously, D and B existing simultaneously, C and D existing simultaneously, A, B, and C existing simultaneously, A, B, and D existing simultaneously, A, C, and D existing simultaneously, and A, B, C, and D existing simultaneously.
[0078] It should be noted that the dimensions of layers and regions may be exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Additionally, it is understood that when an element or layer is referred to as being "below" another element or layer, it can be directly below the other element, or there may be more than one intermediate layer or element. Furthermore, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Similar reference numerals throughout indicate similar elements.
[0079] In this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" means two or more, unless otherwise expressly defined.
[0080] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A projection screen, characterized in that, The projection screen includes: a projection screen, a support assembly, and a roll assembly; One end of the projection screen is connected to the roll assembly; The support assembly includes multiple support bars located on the back of the projection screen. When the projection screen is unfolded, the multiple support bars are arranged on the back of the projection screen in a direction away from the roll assembly. When the projection screen is wound into multiple layers on the roll assembly, the nth layer of the multi-layer projection screen has at least a first support bar, and the (n+1)th layer of the projection screen has at least a second support bar. The orthographic projections of the first support bar on the nth layer of the projection screen and the orthographic projections of the second support bar on the nth layer of the projection screen have an overlapping area, where n≥1. The circumferential spacing between two adjacent support strips on the nth projection screen is less than the circumferential spacing between two adjacent support strips on the (n+1)th projection screen; or, the circumferential width of the support strips on the nth projection screen is less than the circumferential width of the support strips on the (n+1)th projection screen.
2. The projection screen according to claim 1, characterized in that, If the circumferential spacing between two adjacent support strips on the nth layer of the projection screen is less than the circumferential spacing between two adjacent support strips on the (n+1)th layer of the projection screen, then any two adjacent support strips on the nth layer of the projection screen have equal circumferential spacing.
3. The projection screen according to claim 1, characterized in that, When the circumferential spacing between two adjacent support strips on the nth projection screen is less than the circumferential spacing between two adjacent support strips on the (n+1)th projection screen, the width of the plurality of support strips is the same in the circumferential direction, and the overlapping area of the orthographic projection of the first support strip on the nth projection screen and the orthographic projection of the second support strip on the nth projection screen has a circumferential width greater than or equal to three-quarters of the width of the support strip.
4. The projection screen according to claim 1, characterized in that, If the width of the support strip on the nth layer of the projection screen in the circumferential direction is less than the width of the support strip on the (n+1)th layer of the projection screen in the circumferential direction, then the widths of the multiple support strips on the nth layer of the projection screen in the circumferential direction are all equal.
5. The projection screen according to claim 1, characterized in that, If the width of the support strip on the nth projection screen in the circumferential direction is less than the width of the support strip on the (n+1)th projection screen in the circumferential direction, then the circumferential spacing between two adjacent support strips on the nth projection screen is less than the circumferential spacing between two adjacent support strips on the (n+1)th projection screen.
6. The projection screen according to any one of claims 1 to 5, characterized in that, The support strip includes a rigid material layer and a flexible material layer. The rigid material layer is located on the back of the projection screen, and the flexible material layer is stacked on the side of the rigid material layer away from the projection screen. Alternatively, the support assembly may further include a flexible layer that covers the plurality of support strips.
7. The projection screen according to any one of claims 1 to 5, characterized in that, The support strip is bonded to the projection screen; Alternatively, the support assembly may further include a plurality of fixing structures located on the projection screen, with the support strip located on the fixing structures; Alternatively, the projection screen may further include a cover layer, with the plurality of support strips located between the cover layer and the projection screen.
8. A projection device, characterized in that, The projection device includes a projector and a projection screen as described in any one of claims 1 to 7.
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JP2011013266A