Rollable projection screen and projection device

Abstract

The utility model discloses a rollable projection screen and a projection device, relates to the technical field of projection display, and is used for solving the problem that displacement is easy to occur between a diaphragm and a base material of an existing projection screen. The rollable projection screen comprises an optical film, a flexible fixing layer and a suture line. A plurality of first threading holes are formed in the periphery of the optical film at intervals in the circumferential direction. The flexible fixing layer is located on one side of the optical film, the flexible fixing layer and the optical film are arranged in a stacked mode, and a plurality of second threading holes are formed in the flexible fixing layer. And a suture line passes through the plurality of first threading holes and the plurality of second threading holes to mutually suture the optical film and the flexible fixing layer. The rollable projection screen is used for displaying a projection picture.

Description

Technical Field

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

[0002] In the field of projection display technology, a projector and a projection screen are required to be used together. The projection screen generally includes a diaphragm and a substrate. The diaphragm is used to reflect the light projected by the projector into the eyes of the audience, so that the audience can see the image formed by the light from the surface of the diaphragm. The substrate is used to mount the diaphragm on the frame.

[0003] In order to make the film and the substrate fit together, in the related art, a gluing method is generally used to stick the film and the substrate together.

[0004] Although this can make the film and the substrate stick together, the adhesive projection screen will cause the position of the film and the substrate to shift when it is rolled and unfolded, resulting in uneven adhesion between the film and the substrate, affecting the audience's viewing experience. Utility Model Content

[0005] The present application provides a rollable projection screen and a projection device, which are used to solve the problem that the existing projection screen film and substrate are prone to displacement.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] On the one hand, an embodiment of the present application provides a rollable projection screen, comprising an optical film, a flexible fixing layer and a suture. The periphery of the optical film is provided with a plurality of first threading holes arranged at intervals along the circumferential direction. The flexible fixing layer is located on one side of the optical film, is stacked with the optical film, and is provided with a plurality of second threading holes. The suture passes through the plurality of first threading holes and the plurality of second threading holes to sew the optical film and the flexible fixing layer to each other.

[0008] In the rollable projection screen provided in the embodiment of the present application, the sutures can fix the optical film and the flexible fixed layer that are bonded together by suturing. At the same time, the positions of the first threading holes are arranged at intervals along the circumferential direction of the optical film, and the sutures need to pass through the first threading holes and the second threading holes to fix the optical film and the flexible fixed layer. Thus, the sutures can sew and fix the optical film to the flexible fixed layer at the circumferential position of the optical film by passing through the plurality of first threading holes and the second threading holes. Therefore, when the rollable projection screen is rolled up and unfolded, the positions of the plurality of first threading holes and the plurality of second threading holes will not be relatively displaced under the action of the sutures, thereby preventing the positions of the optical film and the flexible fixed layer from being relatively displaced.

[0009] In some embodiments, the rollable screen further comprises a frame and a tensioning assembly. The frame is located on the peripheral side of the flexible fixing layer. The tensioning assembly is connected to the frame and the flexible fixing layer. The optical film is connected to the frame through the flexible fixing layer.

[0010] In some embodiments, the number of the flexible fixing layer is one, and the optical film is disposed on a surface of one side of the flexible fixing layer. Alternatively, the number of the flexible fixing layers is multiple, and the multiple flexible fixing layers are disposed around the circumference of the optical film.

[0011] In some embodiments, the frame has a first clamping portion. The tensioning assembly includes a tensioning member. The tensioning member has a second clamping portion, and the first clamping portion is clamped with the second clamping portion. A portion of the flexible fixing layer is clamped between the tensioning member and the frame.

[0012] In some embodiments, there are multiple flexible fixed layers, and the multiple flexible fixed layers are arranged around the circumference of the optical film. The rollable projection screen also includes a protective coating. The protective coating is stacked and arranged on one side of the optical film close to the flexible fixed layer.

[0013] In some embodiments, the flexible fixing layer is polyester cloth.

[0014] In some embodiments, the suture thread is a polyester thread.

[0015] In some embodiments, along the circumference of the optical film, the spacing between two adjacent first threading holes is 2 mm to 5 mm. Along the circumference of the optical film, the spacing between two adjacent second threading holes is 2 mm to 5 mm.

[0016] In some embodiments, the thickness of the optical film is 0.4 mm to 0.6 mm.

[0017] On the other hand, an embodiment of the present application further provides a projection device, comprising a projector and any one of the above-mentioned rollable projection screens. The projector is used to project projection light. The rollable projection screen is located on one side of the projector and is used to reflect the projection light projected by the projector.

[0018] The technical effect produced by the projection device including any of the above-mentioned projection screens is the same as the technical effect of the above-mentioned projection screen, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the use status of the projection system provided in an embodiment of the present application;

[0020] Figure 2 One of the structural schematic diagrams of the rollable projection screen provided in the embodiment of the present application;

[0021] Figure 3The second structural schematic diagram of the rollable projection screen provided in the embodiment of the present application;

[0022] Figure 4 A side view of a rollable projection screen provided by an embodiment of the present application;

[0023] Figure 5 One of the cross-sectional views of the rollable projection screen provided in the embodiment of the present application;

[0024] Figure 6 A side view of the rollable projection screen provided by an embodiment of the present application when tensioned using a pressure rod;

[0025] Figure 7 A second cross-sectional view of the rollable projection screen provided in an embodiment of the present application;

[0026] Figure 8 A side view of a rollable projection screen provided by an embodiment of the present application when tensioned using aluminum rods and screws;

[0027] Fig. 9 One of the structural schematic diagrams of the optical film provided in the embodiment of the present application;

[0028] Fig.10 A schematic diagram of the use state of the Fresnel lens layer in the optical film provided in an embodiment of the present application;

[0029] Fig.11 The second structural schematic diagram of the optical film provided in the embodiment of the present application;

[0030] Fig.12 The third structural schematic diagram of the optical film provided in the embodiment of the present application;

[0031] Fig.13 A schematic diagram of a process for manufacturing a Fresnel lens layer provided in an embodiment of the present application;

[0032] Fig.14 A schematic diagram of the process of sewing an optical film and a flexible fixing layer provided in an embodiment of the present application.

[0033] Reference numerals:

[0034] 100-projection device; 10-projector; 20-rollable projection screen; 21-optical film; 2101-first threading hole; 211-substrate layer; 212-functional layer; 2121-surface layer; 2122-coloring layer; 2123-diffusion layer; 2124-Fresnel lens layer; 2125-reflection layer; 22-flexible fixing layer; 24-frame; 25-tensioning assembly; 251-tensioning member; 252-aluminum rod; 253-screw; 30-audience. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] In the description of the present application, it should be understood that the terms, "up", "down", "left", "right", "front", "back", "inside", "outside", "center", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0038] In the description of this application, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, "at least one" means one or more, and "multiple" means two or more.

[0039] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0040] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0041] The projection display technology has now been perfectly integrated into our lives, and projection can be seen in daily entertainment.

[0042] Projection display technology is composed of several key components, including light source, optical components, control circuit and projection screen. Among them, the light source is responsible for generating light beams. Optical components can focus, deflect and split the light beams, while projecting the image onto the screen. The control circuit controls the working state and parameters of each component according to the input signal to achieve image generation and display.

[0043] The projection screen is one of the necessary accessories for projection display. If a good projection display device wants to achieve a good projection effect, it needs a good projection screen to match it. The picture viewed by the viewer is directly displayed through the projection screen, so the projection screen and projection display device complement each other.

[0044] Generally, a projection screen may include a diaphragm, a substrate and a frame. The diaphragm is used to reflect light into the eyes of the audience. The substrate is located on one side of the diaphragm and is attached to and connected to the diaphragm. The substrate is connected to the frame, thereby driving the diaphragm to be connected to the frame.

[0045] In the prior art, the film and the substrate are usually connected by gluing. In daily use, such a projection screen will produce internal stress and deformation in the glue inside due to repeated movements of curling and unfolding, resulting in relative displacement between the film and the substrate on both sides of the glue. At the same time, external environmental factors will also cause internal stress in the glue, causing the glue to deform.

[0046] The deformation of the adhesive will cause the relative position between the diaphragm and the substrate to change, so that the diaphragm cannot remain flat, which will affect the effect of the diaphragm displaying the picture and the effect of the audience watching the picture through the projection screen.

[0047] In the prior art, the projection screens that use adhesive bonding are mainly frame-type projection screens and back-plate-type projection screens. Generally, the thickness of the frame-type projection screen is 22 mm to 30 mm, and the thickness of the back-plate-type projection screen is generally 10 mm to 15 mm. The overall thickness of these two projection screens is relatively thick, the weight is relatively heavy, and it is not easy to curl.

[0048] Based on this, Figure 1 As shown, Figure 1 The present invention provides a schematic diagram of the use state of the projection system provided in the embodiment of the present application. The embodiment of the present application provides a projection device 100, including a projector 10 and any one of the above-mentioned rollable projection screens 20. The projector 10 is used to project projection light. The rollable projection screen 20 is located on one side of the projector 10 and is used to reflect the projection light projected by the projector 10.

[0049] The projection system includes a rollable projection screen 20 and a projector 10. To facilitate the description of the projection system, the present application takes the rollable projection screen 20 unfolded in a vertical plane as an example for description, and defines the direction in which the audience 30 looks at the rollable projection screen 20 as the normal viewing direction.

[0050] When in use, the projector 10 can be placed in front of and below the rollable projection screen 20, and the audience 30 is located in front of the rollable projection screen 20 and looks at the rollable projection screen 20. The incident light emitted by the projector 10 is directed toward the rollable projection screen 20, and the incident light is reflected by the rollable projection screen 20 to finally form an outgoing light that is directed toward the audience 30, while forming an image on the projection screen.

[0051] Exemplarily, the projector 10 may include a laser, which may be one of a monochromatic laser, a two-color laser, and a three-color laser, wherein the three-color laser may emit three primary colors that can form almost all other colors.

[0052] Exemplarily, the three-color laser can emit red laser, green laser and blue laser. Among them, the wavelength range of the red laser emitted by the laser can be set to 610nm~650nm, the wavelength range of the emitted green laser can be set to 500nm~540nm, and the wavelength range of the emitted blue laser can be set to 430nm~460nm. Of course, the projector 10 can also be a projector 10 that emits ordinary Guangxi Love You.

[0053] In some embodiments, Figure 2 As shown, Figure 2 This is one of the structural schematic diagrams of the rollable projection screen 20 provided in an embodiment of the present application. The rollable projection screen 20 may include an optical film 21, a flexible fixing layer 22 and a suture line.

[0054] A plurality of first threading holes 2101 are provided at intervals along the circumferential direction on the periphery of the optical film 21. The flexible fixing layer 22 is located on one side of the optical film 21 and is stacked with the optical film 21, and a plurality of second threading holes are provided on the flexible fixing layer 22. Sutures are passed through the plurality of first threading holes 2101 and the plurality of second threading holes to sew the optical film 21 and the flexible fixing layer 22 to each other.

[0055] Because the optical film 21 is provided with a first threading hole 2101, the flexible fixing layer 22 is provided with a second threading hole, and the suture thread can pass through the plurality of first threading holes 2101 and the plurality of second threading holes, and the optical film 21 and the flexible fixing layer 22 are stacked, the suture thread can fix the optical film 21 and the flexible fixing layer 22 that are bonded together by suture.

[0056] At the same time, the positions of the first threading holes 2101 are arranged at circumferential intervals along the periphery of the optical film 21, and the sutures need to pass through the first threading holes 2101 and the second threading holes to fix the optical film 21 and the flexible fixing layer 22. Therefore, it can be understood that the positions of the multiple second threading holes can correspond to the multiple first threading holes 2101.

[0057] Therefore, if Figure 3 As shown, Figure 3 The second structural schematic diagram of the rollable projection screen 20 provided in the embodiment of the present application, the suture thread can sew and fix the optical film 21 to the flexible fixing layer 22 at a circumferential position around the optical film 21 by passing through a plurality of first threading holes 2101 and second threading holes.

[0058] Because the positions of the plurality of first threading holes 2101 and the plurality of second threading holes are fixed, the positions of the sutures are also fixed after passing through the plurality of first threading holes 2101 and the plurality of second threading holes. Therefore, when the rollable projection screen 20 is rolled up and unfolded, the positions of the plurality of first threading holes 2101 and the plurality of second threading holes will not be relatively displaced under the action of the sutures, thereby preventing the positions of the optical film 21 and the flexible fixing layer 22 from being relatively displaced.

[0059] Furthermore, the positions of the first threading holes 2101 and the second threading holes will not be affected by external environmental factors and will not change, so that the positions of the optical film 21 and the flexible fixing layer 22 will not be relatively displaced, thereby ensuring the image display effect of the rollable projection screen 20.

[0060] In some embodiments, Figure 4 As shown, Figure 4 The side view of the rollable projection screen 20 provided in the embodiment of the present application, the rollable screen may further include a frame 24 and a tensioning assembly 25. The frame 24 is located on the peripheral side of the flexible fixed layer 22. The tensioning assembly 25 is connected to the frame 24 and the flexible fixed layer 22. The optical film 21 is connected to the frame 24 through the flexible fixed layer 22.

[0061] The tensioning assembly 25 can be connected to the frame 24 through the peripheral side of the flexible fixing layer 22 . Since the optical film 21 and the flexible fixing layer 22 are sewn together, the optical film 21 can be connected to the frame 24 through the flexible fixing layer 22 .

[0062] The frame 24 can pass through the flexible fixing layer 22 to ensure that the diaphragm can be smoothly unfolded when the diaphragm is used to display an image, thereby ensuring that the projector 10 ( Figure 1 ) The pattern projected onto the diaphragm is clear and stable. At the same time, the frame 24 has a certain decorative effect and can plan a clear viewing range, which helps the audience 30 ( Figure 1) allows you to focus on what’s on the projection screen and also facilitates calibration of image size and position.

[0063] The flexible fixing layer 22 can partially extend outward along the periphery of the optical film 21 , so that when the tensioning assembly 25 and the frame 24 are connected to the flexible fixing layer 22 , they can be connected to the flexible fixing layer 22 at a position where the flexible fixing layer 22 does not overlap with the optical film 21 .

[0064] In this way, the optical film 21 can be connected to the frame 24 through the flexible fixing layer 22, and the structure of the optical film 21 itself can be not damaged, and the optical film 21 will not be blocked. Therefore, the indirect connection through the flexible fixing layer 22 can ensure the integrity of the image display as much as possible.

[0065] For example, the thickness of the frame 24 may range from 1 cm to 1.5 cm. At the same time, the width of the frame 24 may also be reduced.

[0066] In some embodiments, the number of the flexible fixing layer 22 may be one. The optical film 21 is disposed on a surface of one side of the flexible fixing layer 22 .

[0067] When there is one flexible fixing layer 22, the area of ​​the flexible fixing layer 22 is larger than the area of ​​the optical film 21 because the flexible fixing layer 22 needs to extend outwardly from the periphery of the optical film 21. A whole piece of flexible fixing layer 22 is convenient for connection with the optical film 21 and can better maintain the flatness of the optical film 21.

[0068] Exemplarily, the shape of the optical film 21 may be a rectangle.

[0069] Exemplarily, the shape of the flexible fixing layer 22 may be a rectangle, and the length, width and height of the flexible fixing layer 22 are greater than those of the optical film 21 .

[0070] Exemplarily, the flexible fixing layer 22 may be rectangular with an opening in the middle, and the flexible fixing layer 22 only needs to cover the suture line and the periphery of the optical film 21 and extend a portion beyond the periphery of the optical film 21 .

[0071] Alternatively, there may be a plurality of flexible fixing layers 22 , and the plurality of flexible fixing layers 22 are arranged around the circumference of the optical film 21 .

[0072] When there are multiple flexible fixing layers 22 , the multiple flexible fixing layers 22 can cover the sewing line and the periphery of the optical film 21 , and extend a portion beyond the periphery of the optical film 21 .

[0073] For example, the number of the flexible fixing layers 22 may be four, wherein each flexible fixing layer 22 may be in the shape of a rectangle, and the four rectangular flexible fixing layers 22 are respectively arranged at the four sides of the optical film 21 .

[0074] The four flexible fixing layers 22 may be spliced ​​with each other, but without overlapping positions. Alternatively, the four flexible fixing layers 22 may overlap each other.

[0075] Exemplarily, the width of each rectangular flexible fixing layer 22 may be 10 cm to 15 cm.

[0076] In some embodiments, Figure 5 and Figure 6 As shown, Figure 5 This is one of the cross-sectional views of the rollable projection screen 20 provided in the embodiment of the present application. Figure 6 The rollable projection screen 20 provided in the embodiment of the present application is shown in a side view when being tensioned by a pressure rod. The frame 24 may have a first clamping portion. The tensioning assembly 25 may include a tensioning member 251. The tensioning member 251 may have a second clamping portion, and the first clamping portion is clamped with the second clamping portion. A portion of the flexible fixing layer 22 is clamped between the tensioning member 251 and the frame 24.

[0077] The first clamping portion and the second clamping portion are clamped to connect the tensioning member 251 and the frame 24 , and the tensioning member 251 is connected to the flexible fixing layer 22 , so the tensioning member 251 can clamp the flexible fixing layer 22 and the frame 24 .

[0078] For example, Figure 5 and Figure 6 As shown, the tensioning member 251 may be a pressure rod. The second clamping portion on the pressure rod may be a clamping groove, and the first clamping portion on the frame 24 may be a protrusion. The protrusion may be clamped with the clamping groove, so that the pressure rod is connected to the frame 24.

[0079] At this time, the flexible fixing layer 22 is located on the side of the pressure rod away from the clamping groove, and between the pressure rod and the frame 24. Through the clamping of the pressure rod and the frame 24, the flexible fixing layer 22 is tightly connected to the frame 24. At the same time, the shape of the pressure rod can be a long strip. The long strip pressure rod can make the flexible fixing layer 22 more flat, thereby driving the optical film 21 to be more flat.

[0080] In other embodiments, the tensioning method may be other types. The tensioning assembly 25 may include an elastic member. One end of the elastic member is connected to the frame 24, and the other end is connected to the flexible fixing layer 22. In this way, the flexible fixing layer 22 and the frame 24 can be connected.

[0081] Using elastic members to tension the flexible fixing layer 22 can ensure that the flexible fixing layer 22 can maintain a flat state regardless of any deformation it undergoes.

[0082] Exemplarily, the elastic member may be a spring.

[0083] In other embodiments, the tensioning method may be other types. Figure 7 and Figure 8 As shown, Figure 7 The second cross-sectional view of the rollable projection screen 20 provided in the embodiment of the present application is as follows: Figure 8 The side view of the rollable projection screen 20 provided in the embodiment of the present application when being tensioned using the aluminum rod 252 and the screw 253, the tensioning assembly 25 may include the aluminum rod 252 and the screw 253. The aluminum rod 252 and the screw 253 are both located on the side of the frame 24 close to the flexible fixing layer 22. The screw 253 passes through the aluminum rod 252 and is threadedly connected to the frame 24, so that the aluminum rod 252 is tightly connected to the frame 24.

[0084] The flexible fixing layer 22 is located between the aluminum rod 252 and the frame 24 , and is tightly connected to the frame 24 through the aluminum rod 252 , so that the flexible fixing layer 22 is also tightly connected to the frame 24 , thereby making the optical film 21 tightly connected to the frame 24 .

[0085] Meanwhile, the aluminum rod 252 may also be in the shape of a long strip. The long strip-shaped aluminum rod 252 can make the flexible fixing layer 22 smoother, thereby driving the optical film 21 to be smoother.

[0086] In other embodiments, the tensioning method may also be magnetic attraction. The tensioning assembly 25 may include a magnetic attraction member. The flexible fixing layer 22 is located between the magnetic attraction member and the frame 24, and the magnetic attraction member is magnetically attracted to the frame 24 to firmly attach the flexible fixing layer 22 to the frame 24.

[0087] Exemplarily, the tensioning method may also be other types as long as it can tightly connect the flexible fixing layer 22 and the frame 24 .

[0088] In some embodiments, the number of the flexible fixed layers 22 can be multiple, and the multiple flexible fixed layers 22 are arranged around the circumference of the optical film 21. The rollable projection screen 20 also includes a protective coating. The protective coating is stacked on one side of the optical film 21 close to the flexible fixed layer 22.

[0089] When there are multiple flexible fixed layers 22, or when an opening is provided on the flexible fixed layer 22, some positions on the optical film 21 cannot be completely covered by the flexible fixed layer 22, which makes it impossible to fully protect the positions on the optical film 21 that cannot be completely covered by the flexible fixed layer 22.

[0090] At this time, a protective coating can be added on one side of the optical film 21 close to the flexible fixing layer 22 to protect the optical film 21 that is not completely protected, so that all positions of the optical film 21 are protected. This can make the quality of the display image of the rollable projection screen 20 better.

[0091] For example, the protective coating may be an ink protective coating. The ink protective layer can significantly increase the wear resistance and moisture resistance of the film, thereby increasing the service life of the optical film 21.

[0092] In some embodiments, the flexible fixing layer 22 may be made of polyester cloth.

[0093] Polyester is a widely used synthetic fiber material. Polyester fiber has high strength and elastic recovery ability, which means it can withstand large external forces without being easily damaged. Even after multiple stretching, it can quickly return to its original shape and is not prone to wrinkles.

[0094] Therefore, the flexible fixing layer 22 made of polyester cloth can quickly return to its original state after repeated curling and unfolding, without causing displacement and gap between the optical film 21, thereby ensuring the flatness of the rollable projection screen 20 itself.

[0095] Moreover, polyester has good resistance to a variety of chemical substances, including acid, alkali, oxidant, etc., is not easily corroded, and is not afraid of mold and insects. This enables the flexible fixing layer 22 made of polyester cloth to have a longer service life.

[0096] Exemplarily, the polyester fabric may be a coated polyester fabric or an uncoated polyester fabric.

[0097] The coated polyester cloth can provide further protection for itself and the optical film 21. The uncoated polyester cloth is thinner and is more conducive to the bending and folding of the rollable projection screen 20.

[0098] In other embodiments, the flexible fixing layer 22 may also be other types of films such as PU film and PVC film, as long as the flexible fixing layer 22 can be firmly sewn to the optical film 21 and stably connected to the frame 24 .

[0099] There may be different combinations of the configuration of the flexible fixing layer 22 and the configuration of the tensioning assembly 25 .

[0100] Exemplarily, when there are multiple flexible fixing layers 22 , the tensioning method may be a spring in combination with an inner and outer frame, or an aluminum rod 252 in combination with a screw 253 .

[0101] When the number of the flexible fixing layer 22 is one, the tensioning method may be a spring in combination with an inner and outer frame, or an aluminum rod 252 in combination with a screw 253 .

[0102] In some embodiments, the suture thread can be a polyester thread.

[0103] As can be seen from the above, polyester thread has high strength and elastic recovery ability. Therefore, using polyester thread to sew the optical film 21 and the flexible fixing layer 22 can ensure the sew strength, and during the sew process, the polyester thread can be properly tensioned to achieve a better sew effect.

[0104] At the same time, the polyester thread with good resistance can resist the erosion and influence of the external environment, thereby enhancing the strength of the connection between the two.

[0105] Exemplarily, the sewing thread may also be made of other types of materials as long as it can firmly sew the optical film 21 and the flexible fixing layer 22 together.

[0106] In some embodiments, along the circumference of the optical film 21, the spacing between two adjacent first threading holes 2101 may be 0.05mm, and along the circumference of the optical film 21, the spacing between two adjacent second threading holes may be 2mm-5mm.

[0107] The spacing between two adjacent first threading holes 2101 and the spacing between two adjacent second threading holes should not be too long or too short. When the spacing between two adjacent first threading holes 2101 and the spacing between two adjacent first threading holes 2101 are too long, the connection strength between the optical film 21 and the flexible substrate layer will be relatively weak, and relative displacement between the two is likely to occur during rolling and unfolding, thereby making the surface of the rollable projection screen 20 uneven.

[0108] When the interval between two adjacent first threading holes 2101 and the interval between two adjacent first threading holes 2101 are too small, the optical film 21 and the flexible fixing layer 22 will be relatively fragile at the seam. When the rollable projection screen 20 is rolled up and unfolded, it will be easy to break at the seam, causing damage to the rollable projection screen 20.

[0109] Therefore, the spacing between two adjacent first threading holes 2101 and the spacing between two adjacent second threading holes are controlled within 2 mm to 5 mm, which can not only stably connect the optical film 21 and the flexible fixing layer 22, but also ensure that the strength of both is not easily damaged.

[0110] In general, if Fig. 9 As shown, Fig. 9This is one of the structural schematic diagrams of the optical film 21 provided in the embodiment of the present application. The composition of the optical film 21 may include a substrate layer 211 and a functional layer 212. Among them, the functional layer 212 may specifically include a surface layer 2121, a coloring layer 2122, a diffusion layer 2123, a Fresnel lens layer 2124 and a reflective layer 2125.

[0111] Specifically, the surface layer 2121 mainly plays a protective role and is used to protect other functional layers 212. The coloring layer 2122 is mainly used to improve the contrast of the image displayed by the optical film 21 and improve the quality of the image. The diffusion layer 2123 contains diffusion particles, which are used to diffuse the light passing through to increase the refraction and reflection range of the light, thereby increasing the viewing angle range of the optical film 21. At the same time, the diffusion particles can also reduce the number of speckles and enhance the quality of the image.

[0112] like Fig.10 As shown, Fig.10 The optical film 21 ( Figure 2 ) is a schematic diagram of the use state of the Fresnel lens layer 2124 in FIG. The surface structure of the Fresnel lens layer 2124 is a concentric circular prism from large to small. Its optical principle is similar to mirror reflection, and it can simultaneously block ambient stray light from above and on both sides of the screen. However, it will also block part of the light projected by the projector 10, which results in a very small viewing angle of the Fresnel screen, which is suitable for an environment where a small number of viewers 30 watch from the front.

[0113] Therefore, the Fresnel lens layer 2124 can improve the light utilization rate through its own special structure, and can also resist the interference of ambient light on the display image, so that the quality of the image viewed by the viewer 30 is better.

[0114] In the prior art, the surface layer 2121, the coloring layer 2122, the diffusion layer 2123 and the Fresnel lens layer 2124 are commonly made of acrylic UV glue. The thickness of each functional layer 212 is in the range of 10um to 100um. The base material 211 is commonly made of transparent PET, and the thickness is in the range of 100um to 200um.

[0115] After the above materials are bonded together by acrylic UV adhesive to form a diaphragm, the formed diaphragm has a relatively high hardness and a thickness of about 1mm, which is also relatively thick. The diaphragm formed in this way is prone to internal delamination and diaphragm deformation after being subjected to force.

[0116] Therefore, in order to achieve perforation and sewing of the diaphragm and good flatness, the diaphragm can be improved. Exemplarily, the material of the substrate layer 211 can be selected as flexible PU. Flexible PU has high elasticity and flexibility and can easily return to a normal shape. When the substrate layer 211 uses flexible PU, the thickness ranges from 50um to 100um, which is reduced compared to before.

[0117] Exemplarily, the material of the substrate layer 211 may also be other materials such as flexible TPU, PVC and PET.

[0118] For example, Fig. 9 As shown, the shape of the surface layer 2121 can be a shape composed of multiple arcs. The arc-shaped surface can help the light to be further refracted.

[0119] In other embodiments, Fig.11 As shown, Fig.11 The second structural diagram of the optical film 21 provided in the embodiment of the present application, the surface layer 2121 can be an atomized surface, and diffusion particles can be distributed in the surface layer. The role played by the diffusion particles is the same as that played by the diffusion layer, which can increase the size of the rollable projection screen 20 ( Figure 1 ) viewing angle.

[0120] In other embodiments, Fig.12 As shown, Fig.12 The third structural diagram of the optical film 21 provided in the embodiment of the present application, the surface layer 2121 can also be relatively smooth, and the surface layer 2121 can evenly reflect light, thereby improving the rollable projection screen 20 ( Figure 1 )'s reflection efficiency makes the picture clearer and brighter.

[0121] Exemplarily, both the coloring layer 2122 and the diffusion layer 2123 can be made of flexible pressure-sensitive adhesive. The flexible pressure-sensitive adhesive has excellent transparency, weather resistance, chemical resistance and high temperature performance. When the coloring layer 2122 and the diffusion layer 2123 use the flexible pressure-sensitive adhesive, the single layer thickness ranges from 20um to 50um.

[0122] In some embodiments, Fig.13 As shown, Fig.13 The process diagram of manufacturing a Fresnel lens layer provided in the embodiment of the present application is as follows. The method of manufacturing a Fresnel lens layer may include the following steps:

[0123] S100~S400.

[0124] S100: Prepare materials such as acrylic UV glue, silicone, photosensitizer, diluent and additives.

[0125] S200: Customize the proportion of each material according to product requirements and performance requirements.

[0126] S300: Mix the materials evenly according to the designed proportions.

[0127] S400: Put the mixed materials into the curing equipment to cure the mixed materials.

[0128] Thus, the modification of acrylic UV adhesive is completed, and the Fresnel lens layer after the modified material has lower hardness and better flexibility, and the projection screen made of the modified material has better performance.

[0129] For example, the siloxane may be other types of siloxanes such as dimethylsiloxane, polydimethylsiloxane, and cyclic siloxane. Siloxane has stable chemical properties, is not easy to react with other substances, and can maintain the stability of other reactants.

[0130] For example, the curing device may be a light curing device, which can emit ultraviolet rays, and the ultraviolet rays can cure the UV glue. The light curing method is environmentally friendly and fast, and can quickly shape the Fresnel lens layer.

[0131] In some embodiments, the thickness of the optical film 21 may be 0.4 mm to 0.6 mm.

[0132] Compared with the films in the prior art, the modified optical film 21 has better improvements in thickness and elasticity. The overall thickness of the improved optical film 21 can range from 0.4 mm to 0.6 mm. The thinner optical film 21 can be more easily rolled and unfolded, and when the optical film 21 is sewn with the flexible fixing layer 22, the thinner optical film 21 is also easier to operate.

[0133] Exemplarily, a sewing machine can be used to sew the optical film 21 and the flexible fixing layer 22 together. At this time, the sewing thread includes an upper thread and a lower thread, and the upper thread and the lower thread cooperate with each other to sew the optical film 21 and the flexible fixing layer 22 together.

[0134] In some embodiments, Fig.14 As shown, Fig.14 The schematic diagram of the process of sewing an optical film and a flexible fixing layer provided in an embodiment of the present application, the method of sewing the optical film and the flexible fixing layer together may include the steps: S500 to S700.

[0135] S500: Fixing the flexible fixing layer on the sewing tool.

[0136] S600: The membrane is fixed on the flexible substrate by double-sided adhesive without substrate.

[0137] S700: Adjust the tension of the upper and lower threads and the pressure of the presser foot while sewing.

[0138] In this way, the optical film and the flexible fixing layer can be sewn together. When the tension of the upper and lower threads and the pressure of the presser foot are in a suitable state, the optical film and the flexible fixing layer are in a flat and attached state, and the two will not shift when curling and unfolding, and the two will not be uneven at the first threading hole and the second threading hole due to overly tight sewing.

[0139] Exemplarily, the upper thread tension can be adjusted by manipulating the upper thread tension regulator on the sewing machine. In order to achieve the best sewing effect of the optical film 21 and the flexible fixing layer 22, the upper thread tension should be moderate, not too tight or too loose.

[0140] Adjusting the tension of the lower thread can be achieved by controlling the lower thread tension device of the sewing machine. In order to achieve the best sewing effect of the optical film 21 and the flexible fixed layer 22, the tension of the lower thread should be moderate, not too tight nor too loose.

[0141] When adjusting the upper thread tension and the lower thread tension, the upper thread tension regulator can be operated to adjust the tension to the middle value first, and the lower thread tension device can be operated to adjust the tension to the middle value as well.

[0142] Then carry out sewing operation, and judge whether the current upper thread tension and lower thread tension are appropriate from the sewing results. If not, gradually test and adjust them until the upper thread tension and lower thread tension reach the ideal effect.

[0143] For example, when the flexible fixing layer 22 is polyester cloth, the upper thread tension and the lower thread tension can be 3 to 4. When the flexible fixing layer 22 is a PVC film, the upper thread tension and the lower thread tension can be 4 to 5. When the flexible fixing layer 22 is a PU film, the upper thread tension and the lower thread tension can be 2 to 3.

[0144] The size of the presser foot pressure is related to the thickness of the sewing material. The thicker the sewing material, the greater the presser foot pressure required, and the thinner the sewing material, the smaller the presser foot pressure required. Generally, the adjustment range of the presser foot pressure is 40~80.

[0145] For example, when the overall thickness of the optical film 21 is 0.6 mm, the range of the presser foot pressure may be 60-80, and when the optical film 21 material is flexible PU, the overall thickness is 0.4 mm, and the range of the presser foot pressure may be 40-50.

[0146] Exemplarily, before the optical film 21 is sewn, it may be pre-treated by hot melting to soften the optical film 21 so as to make it easier to sew.

[0147] Through the material selection and modification of the above solution, the weight of the rollable projection screen 20 is finally reduced by 20% compared with the projection screen in the prior art.

[0148] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A rollable projection screen, characterized in that: include: An optical film, wherein a plurality of first threading holes are arranged at intervals along the circumferential direction on the periphery of the optical film; A flexible fixing layer, the flexible fixing layer is located on one side of the optical film, is stacked with the optical film, and at least a portion of the flexible fixing layer is arranged around the circumference of the optical film; a plurality of second threading holes are opened on the flexible fixing layer; as well as, A suture thread is used to sew the optical film and the flexible fixing layer together through the plurality of first threading holes and the plurality of second threading holes.

2. The rollable projection screen according to claim 1, characterized in that: The rollable projection screen also includes: a frame, the frame being located at a peripheral side of the flexible fixing layer; and A tensioning assembly, the tensioning assembly is located on a side of the frame close to the optical film; the tensioning assembly is connected to the frame and the flexible fixing layer; The optical film is tightly connected to the frame via the flexible fixing layer, so that the position of the optical film is fixed relative to the frame.

3. The rollable projection screen according to claim 1, characterized in that: The number of the flexible fixed layer is one; the optical film is arranged on the surface of one side of the flexible fixed layer; or, There are multiple flexible fixing layers, and the multiple flexible fixing layers are arranged around the circumference of the optical film.

4. The rollable projection screen according to claim 2, characterized in that: The frame is provided with a first clamping portion; The tensioning assembly comprises: A tensioning member is provided with a second clamping portion, and the first clamping portion is clamped with the second clamping portion; a portion of the flexible fixing layer is located between the tensioning member and the frame, is clamped by the tensioning member and the frame, and is tightly connected to the frame.

5. The rollable projection screen according to claim 3, characterized in that: The number of the flexible fixed layers is multiple, and the multiple flexible fixed layers are arranged around the circumference of the optical film; the rollable projection screen also includes: A protective coating layer is stacked on a side of the optical film close to the flexible fixing layer.

6. The rollable projection screen according to claim 3, characterized in that: The material used to make the flexible fixing layer is polyester cloth.

7. The rollable projection screen according to claim 1, characterized in that: The material used to make the suture thread is polyester thread.

8. The rollable projection screen according to claim 1, characterized in that: Along the circumference of the optical film, the distance between two adjacent first threading holes is 2 mm to 5 mm; along the circumference of the optical film, the distance between two adjacent second threading holes is 2 mm to 5 mm.

9. The rollable projection screen according to claim 1, characterized in that: The thickness of the optical film is 0.4 mm to 0.6 mm.

10. A projection device, characterized in that: include: A projector, wherein the projector is used to project projection light; as well as, The rollable projection screen according to any one of claims 1 to 9, wherein the rollable projection screen is located on one side of the projector and is used to reflect the projection light projected by the projector.

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