Projection screen and projection system

Abstract

A projection screen and a projection system. The projection screen comprises: a display film (110), the display film (110) having a projection light receiving surface; a screen frame (120), the screen frame (120) being foldable; and a sound production unit (130), the sound production unit (130) being located on the side of the display film (110) opposite to the projection light receiving surface. Since the screen frame (120) is foldable, the volume of the projection screen for home entry can be reduced, thereby achieving convenient home entry, reducing the volume for transportation and home entry, optimizing the size of the projection screen, and improving the home entry problem of large-sized projection screens having the sound production unit (130).

Description

Projection screens and projection systems

[0001] This application claims priority to Chinese patent application No. 202410135006.3, filed on January 31, 2024, and entitled “Projection Screen and Projection System”, and priority to Chinese patent application No. 202410196470.3, filed on February 22, 2024, and entitled “Projection Screen and Projection System”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of optoelectronic technology, and in particular to a projection screen and a projection system. Background Art

[0003] As society continues to develop, people's pursuits are also constantly changing. Projection display systems are increasingly being used in people's work and daily lives. Currently, laser TV sound screens consist of a sounding plate, an exciter, a diaphragm, and a frame. The exciter vibrates the sounding plate to produce sound. However, existing sounding screens are generally large in size, making them inconvenient to transport and install in homes.

[0004] Public content

[0005] Embodiments of the present application provide a projection screen and a projection system.

[0006] In one aspect, an embodiment of the present application provides a projection screen, comprising:

[0007] A display film having a projection light-receiving surface; a screen frame, which is foldable; and a sound-generating unit located on a side of the display film opposite to the projection light-receiving surface.

[0008] On the other hand, an embodiment of the present application provides a projection system, which includes a projection device and the projection screen described in the present application, and the projection device is used to project a projection image onto the projection screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the implementation methods in the embodiments of the present application or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technology descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0010] FIG1 is a schematic structural diagram of a projection screen at a first viewing angle provided by an embodiment of the present application;

[0011] FIG2 is a schematic structural diagram of a second viewing angle of a projection screen provided by an embodiment of the present application;

[0012] FIG3 is a schematic structural diagram of a display film in a projection screen provided by an embodiment of the present application;

[0013] FIG4 is an assembly diagram of a screen frame and a sound unit in a projection screen provided by an embodiment of the present application;

[0014] FIG5 is a schematic diagram of a first state of a screen frame in a projection screen provided by an embodiment of the present application;

[0015] FIG6 is a schematic diagram of a second state of a screen frame in a projection screen provided by an embodiment of the present application;

[0016] FIG7 is a schematic structural diagram of a connecting rod in a first state of a projection screen provided by an embodiment of the present application;

[0017] FIG8 is a partial enlarged view of point I in FIG7;

[0018] FIG9 is a schematic structural diagram of a second state of a connecting rod in a projection screen provided by an embodiment of the present application;

[0019] FIG10 is a schematic diagram of a first state of a projection screen provided by an embodiment of the present application;

[0020] FIG11 is a schematic structural diagram of a projection screen in a second state at a first viewing angle according to an embodiment of the present application;

[0021] FIG12 is a schematic structural diagram of a projection screen in a second state and a second viewing angle according to an embodiment of the present application;

[0022] FIG13 is a schematic diagram of the structure of a sound-emitting unit in a projection screen provided in an embodiment of the present application;

[0023] FIG14 is a schematic structural diagram of a projection screen at a third viewing angle according to an embodiment of the present application;

[0024] FIG15 is a schematic structural diagram of a second vertical beam provided in an embodiment of the present application;

[0025] FIG16 is an assembly diagram of the second vertical beam, the sound unit, and the display diaphragm in the projection screen provided by an embodiment of the present application;

[0026] FIG17 is a schematic diagram of the structure of a sound-emitting unit in a projection screen provided in an embodiment of the present application;

[0027] FIG18 is a schematic structural diagram of a projection screen at a fourth viewing angle according to an embodiment of the present application;

[0028] FIG19 is a schematic structural diagram of a projection screen at a fifth viewing angle according to an embodiment of the present application;

[0029] FIG20 is a graph showing the relationship between the height change of the resonance cavity of the sound-emitting unit and the average sound pressure level in the projection screen provided by an embodiment of the present application;

[0030] FIG21 is a diagram showing the relationship between the change in the diameter of the sound expansion hole of the sound-emitting unit and the average sound pressure level in the projection screen provided by an embodiment of the present application;

[0031] FIG22 is a schematic diagram of the assembly of the sound unit and the support column in the projection screen according to an embodiment of the present application in a first position;

[0032] FIG23 is a schematic diagram of the assembly of the sound unit and the support column in the projection screen according to an embodiment of the present application in a second position;

[0033] FIG24 is a diagram showing the relationship between the resonant frequency change and the sound pressure of the piezoelectric speaker in the projection screen provided by an embodiment of the present application;

[0034] FIG25 is a diagram showing the relationship between the resonant frequency change and the sound pressure of the resonance cavity in the projection screen provided by an embodiment of the present application;

[0035] FIG26 is a diagram showing the relationship between the resonant frequency change and the sound pressure of the piezoelectric speaker in the projection screen provided by an embodiment of the present application;

[0036] FIG27 is a schematic structural diagram of a projection screen at a sixth viewing angle according to an embodiment of the present application;

[0037] FIG28 is a partial enlarged view of point I in FIG27;

[0038] FIG29 is a schematic diagram of the assembly of a display diaphragm and a tensioning unit in a projection screen provided by an embodiment of the present application from a first viewing angle;

[0039] FIG30 is a schematic diagram showing the assembly of the display diaphragm and the tensioning unit at a second viewing angle in the projection screen provided by an embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0041] Currently, laser TV sound screens consist of a sounding plate, an exciter, a diaphragm, and a frame. Sound is primarily produced by the exciter vibrating the sounding plate. However, existing sounding screens larger than 100 inches are limited in size, making them difficult to install in homes. Installation is time-consuming and labor-intensive, and assembly is complex and difficult, resulting in a poor user experience.

[0042] To overcome the deficiencies in the prior art, the projection screen and projection system provided by this application utilize a foldable screen frame and sound-emitting units. This allows for the foldability of multiple sound-emitting units, reducing the volume of the projection screen when it enters the home, enabling convenient home installation and reducing transportation and / or home installation volume. This optimizes the size of the projection screen, improving the problem of large-sized projection screens with sound-emitting units entering homes. Furthermore, this embodiment integrates the various structures, assembling them in the factory and then performing simple assembly at the user's home. This makes the overall installation of the projection screen more convenient and easy to operate, shortens product assembly time, significantly reduces labor intensity, increases product impact, and enhances user experience.

[0043] The contents of this application will be described in detail below with reference to the accompanying drawings so that those skilled in the art can understand the contents of this application more clearly and in detail.

[0044] As shown in Figure 1, an embodiment of the present application provides a projection screen 100, which includes: a display film 110, the display film 110 has a projection light-receiving surface; a screen frame 120, the screen frame 120 is foldable; and a sound unit 130, the sound unit 130 is located on the side of the display film 110 opposite to the projection light-receiving surface.

[0045] Through the above arrangement, since the screen frame 120 is foldable, the size of the projection screen 100 can be reduced when it is brought into the home, making it easier to bring it into the home, reducing the transportation and / or volume required for bringing it into the home, optimizing the size of the projection screen 100, and improving the problem of bringing a large projection screen 100 with a sound unit 130 into the home. Furthermore, this embodiment integrates the various structures, assembling them at the factory and then performing simple assembly at the user's home. This makes the overall installation of the projection screen 100 more convenient and easier to operate, shortens product assembly time, significantly reduces labor intensity, increases product impact, and enhances user experience.

[0046] As shown in Figure 1, in some embodiments, the screen frame 120 is a frame structure, and the screen frame 120 encloses a rectangular or square hollow area, which can be used to place the display film 110, and the screen frame 120 can surround the edge of the display film 110 to provide protection for the display film 110. The screen frame 120 and the display film 110 are connected and tensioned by a deformable or displaceable tensioning module.

[0047] In some embodiments, the screen frame 120 may be a metal member, and its material may include one or more of copper, iron, aluminum, tin, and lead.

[0048] In some embodiments, the screen frame 120 may be made of plastic.

[0049] It should be noted that the embodiment of the present application does not impose any additional restrictions on the specific material of the screen frame 120 .

[0050] Of course, during manufacturing, the screen frame 120 can also be made of steel plates, plastics or synthetic materials while ensuring strength.

[0051] As shown in Figures 4 and 5, in some embodiments, the screen frame 120 includes a first frame 121 and a second frame 122; the first frame 121 and the second frame 122 are alternately arranged to surround the outer periphery of the display film 110, wherein at least one of the first frame 121 and the second frame 122 is a foldable frame and includes multiple frame segments; the sound unit 130 is connected to one of the first frame 121 and the second frame 122.

[0052] Through the above arrangement, the screen frame 120 is a frame-shaped structure formed by alternating first frames 121 and second frames 122. Moreover, since at least one of the first frames 121 and the second frames 122 is a foldable frame, the entire screen frame 120 has a foldable feature, which can reduce the volume of the projection screen 100 entering the home, realize convenient home entry, reduce the transportation and / or home entry volume, and improve the problem of entering the home of a large-sized projection screen 100 with a sound unit 130.

[0053] Among them, in order to realize the convenient home installation and quick assembly of the projection screen 100, the screen frame 120 can be composed of multiple first frames 121 and second frames 122 assembled with each other. Generally, considering the convenience of installation, it can be composed of multiple first frames 121 and second frames 122 assembled with each other. However, in practice, the size can be considered and no excessive restrictions are imposed here.

[0054] As shown in Figures 1 and 4, in some embodiments, the length of the second frame 122 is greater than the length of the first frame 121. The second frame 122 is a foldable frame and includes multiple frame segments. Through this arrangement, due to the greater length of the second frame 122, the screen frame 120 is formed into a rectangular frame, which meets the structural requirements of the projection screen 100. In addition, the second frame 122 is designed to be foldable, so the screen frame 120 can use the second frame 122 to reduce its length, making it easier to enter the home.

[0055] As shown in FIG. 1 , in some embodiments, the second frame 122 may be a long frame, the first frame 121 may be a short frame, and the first frame 121 , the second frame 122 , another first frame 121 , and another second frame 122 are connected in sequence to form a screen frame 120 .

[0056] As shown in FIG. 10 , in some embodiments, there are at least two sound emitting units 130 , and each sound emitting unit 130 is connected to the screen frame 120 .

[0057] Through the above arrangement, the sound unit 130 in the projection screen 100 is a split design, and at least two sound units 130 can be independently produced and transported, and then respectively connected to the screen frame 120, further reducing the entrance size of the sound unit 130 and the projection screen 100.

[0058] In some embodiments, the projection screen 100 has at least two folding areas, each of which corresponds to at least one sound unit 130. As shown in FIG10 , the projection screen 100 is divided into two left and right folding areas, each of which corresponds to a sound unit 130. The size of the two sound units 130 is only half that of the projection screen 100, making it very easy to transport and install.

[0059] As shown in Figures 7 and 13, in some embodiments, the sound unit 130 includes an exciter 131 and a sound plate 132; the sound plate 132 is located on the side of the display diaphragm 110 opposite to the projection light-receiving surface, and the exciter 131 is located on the side of the sound plate 132 away from the display diaphragm 110, and is used to drive the sound plate 132 to vibrate and make sound, and there is a gap between the sound plate 132 and the display diaphragm 110.

[0060] Through the above arrangement, the exciter 131 can drive the sound plate 132 to vibrate and make sound when working. Since the sound plate 132 is arranged on one side of the display membrane 110, the sound can be transmitted through the display membrane 110 to the projection light-receiving surface, and then transmitted to the user, realizing the sound of the projection screen 100.

[0061] In some embodiments, the actuator 131 is mounted on the sounding plate 132, driving the plate 132 to vibrate and produce sound, resulting in a better acoustic effect and easier integration of sound and image. In some embodiments, the actuator 131 can be any one or more of an electromagnetic actuator, a magnetostrictive actuator, and a piezoelectric actuator, providing a wide range of applications.

[0062] In some embodiments, the exciter 131 may also include a magnetic field generating unit (such as a magnet) and a vibration coil. The magnetic field generating unit is used to generate a magnetic field. By inputting a continuously changing current into the vibration coil, the force exerted by the vibration coil in the magnetic field generated by the magnetic field generating unit continuously changes, thereby generating vibration.

[0063] In some embodiments, considering the weight of the actuator 131, the actuator 131 is mounted on the sounding plate 132. This ensures sound generation while also improving the stability of the actuator 131. In some embodiments, the gap between the sounding plate 132 and the display membrane 110 ranges from 3 mm to 5 mm, and the specific value can be adjusted based on actual conditions.

[0064] As shown in Figures 1 to 6, this embodiment provides a projection screen 100, comprising: a display film 110 having a projection light-receiving surface; wherein the front surface of the display film 110 is the projection light-receiving surface; and a screen frame 120, comprising at least two first frames 121 and second frames 122, the first frames 121 and the second frames 122 being alternately arranged to surround the outer periphery of the display film 110. The second frames 122 are longer than the first frames 121, are foldable, and comprise multiple frame segments.

[0065] At least two sound-emitting units 130, each of which includes an exciter 131 and a sound-emitting plate 132. The sound-emitting plate 132 is arranged on one of the first frame 121 and the second frame 122, and is located on the side away from the projection light-receiving surface. The exciter 131 is arranged on the side of the sound-emitting plate 132 away from the display film 110, and is used to drive the sound-emitting plate 132 to vibrate and produce sound. There is a gap between the sound-emitting plate 132 and the display film 110.

[0066] By configuring the screen frame 120 and the sound unit 130, wherein the screen frame 120 is foldable, the multiple sound units 130 can be folded together, thereby reducing the volume of the projection screen 100 when entering the home, achieving convenient home entry, reducing transportation and / or home entry volume, optimizing the size of the projection screen 100, and improving the problem of entering the home with a large-sized projection screen 100 with a sound unit 130. At the same time, this embodiment integrates the various structures, assembles the various structures in the factory, and then performs simple assembly after arriving at the user's home, making the overall installation of the projection screen 100 more convenient and easy to operate, shortening the product assembly time, significantly reducing labor intensity, increasing product influence, and improving user experience.

[0067] The second frame 122 is foldable, and the sound unit 130 can be pre-attached to the screen frame 120 and folded and moved as the second frame 122 folds. This facilitates the folding of the scattered frame structure, reducing the transport and / or home volume while allowing the folded screen frame 120 to be quickly assembled, enhancing the product's impact.

[0068] In other embodiments, the first frame 121 and the second frame 122 can be folded. In this case, the sound unit 130 and the screen frame 120 are relatively independent structures. After the screen frame 120 is installed, the sound unit 130 is installed.

[0069] As shown in Figures 1 to 6, and Figures 27 to 30, in some embodiments, the projection screen 100 also includes a tensioning unit 180, which includes a pull rod 181 and a tensioning member 182. The pull rod 181 is connected to the end of the display film 110, and the tensioning member 182 is movably arranged at the end of the screen frame 120. The end of the tensioning member 182 abuts against the pull rod 181 to drive the pull rod 181 to move through the movement of the tensioning member 182.

[0070] With the above arrangement, the pull rod 181 is connected to the end of the display film 110 , and the display film 110 can be moved by pulling or pushing the pull rod 181 , thereby putting the display film 110 in a tensioned state.

[0071] In some embodiments, the display film 110 can generally be composed of a hard layer, a Fresnel structure layer, and a projection layer, etc., and has a certain strength and rigidity. In addition, it can maintain a certain verticality when in a vertical free-hanging state, so that the display film 110 appears flat. However, since the display film 110 still has a certain degree of softness, if it is unsupported or disturbed by external forces, the display film 110 still cannot achieve the required flatness for display. The uneven screen will cause the laser projection image to be distorted, blurred, uneven in brightness, or other degradation issues when displayed. In order to achieve the flatness of the display film 110, in some embodiments, the display film 110 includes a film body 111 and a synthetic fabric 112 that are bonded to each other.

[0072] In some embodiments, the diaphragm body 111 is made of a rigid material, and the synthetic fabric 112 has the characteristics of being inelastic, ultra-thin, dense, and high-strength. In this way, when the synthetic fabric 112 and the diaphragm body 111 are bonded together, an integrated structure can be formed between the two, thereby facilitating the transmission of force and enabling the diaphragm body 111 to stretch following the deformation of the synthetic fabric 112.

[0073] In some embodiments, the synthetic fabric 112 may be a soft fabric, which can better transmit force when stretched, is relatively stable, and can adapt to a wide range of environments, for example, maintaining good flatness and reliability in ambient temperatures between -10°C and 40°C.

[0074] In some embodiments, after the screen frame 120 is assembled, when the display film 110 is assembled, a pull rod 181 with holes is inserted into the synthetic cloth 112, and the holes on the synthetic cloth 112 correspond to those on the pull rod 181. At the same time, there are threaded holes at corresponding positions on the screen frame 120. After the threaded holes of the synthetic cloth 112, the pull rod 181 and the screen frame 120 are aligned, a tensioning member 182 is installed on the screen frame 120, and the screwing depth of the tensioning member 182 in the threaded hole is adjusted so that the pull rod 181 drives the end of the synthetic cloth 112 to move different distances. The middle of the synthetic cloth 112 is tightened, and because the display film 110 and the synthetic cloth 112 are fitted together, the display film 110 can be tightened, completing the tensioning and fixation of the entire display film 110.

[0075] In this embodiment, the pull rod 181 can move relative to the screen frame 120. Therefore, when one end of the pull rod 181 is fixed to the edge of the synthetic cloth 112 and the other end is connected to the tensioning member 182 surrounded by the screen frame 120, the synthetic cloth 112 can be stretched by the movement of the tensioning member 182, forcing the synthetic cloth 112 to open into a flat stretched state, and then the diaphragm body 111 is in a stretched state, so that the display diaphragm 110 is flat.

[0076] As shown in Figures 1 to 6 and Figures 27 to 30, in some embodiments, the moving direction of the tensioning member 182 matches the moving direction of the pull rod 181; and / or, the moving direction of the tensioning member 182 matches the stretching direction of the display film 110.

[0077] Through the above arrangement, the tensioning member 182 drives the display film 110 to be in a stretched state, which can be divided into forward installation and reverse installation. Specifically, the tensioning member 182 is located on the front side of the display film 110 and can be configured to drive the display film 110 to stretch toward the outer edge of the screen frame 120 on the front side.

[0078] As shown in Figures 1 to 6 and Figures 27 to 30, in some embodiments, the tensioning member 182 is located on the back of the display film 110 and can be configured to move the display film 110 around the outer edge of the screen frame 120 and stretch toward the back side of the screen frame 120 to achieve reverse installation. In addition, it should be noted that whether it is installed in the right or wrong direction, as long as the tensioning member 182 can stretch the display film 110 and the screen is flat, the specific embodiment of the present application is not too restrictive.

[0079] In some embodiments, the moving direction of the tensioning member 182 is parallel to or nearly parallel to the stretching direction of the display film 110 .

[0080] This can bring two benefits: on the one hand, it can reduce the overall volume and thickness of the projection screen 100. When the tensioning member 182 moves, the direction of movement is located in the plane where the display film 110 is located, or has a small angle with the plane. Therefore, the deformation in the thickness direction of the projection screen 100 is small, which can effectively reduce the thickness of the projection screen 100. On the other hand, when the moving direction of the tensioning member 182 is parallel to the stretching direction of the display film 110, it is also easy to stretch and extend the display film 110 along the plane where it is located.

[0081] As shown in Figures 1 to 13, in some embodiments, the sound-emitting unit 130 further includes a support frame 133, which is disposed on one of the first frame 121 and the second frame 122. The sound-emitting plate 132 is disposed on the support frame 133, and the support frame 133 is used to support the sound-emitting plate 132 and the exciter 131. Through the above arrangement, the provision of the support frame 133 is primarily used to support or install the sound-emitting plate 132 and the exciter 131, making the installation of the sound-emitting plate 132 and the exciter 131 more stable. At the same time, the sound-emitting plate 132 and the exciter 131 can be integrated as a whole, providing convenience during assembly or installation.

[0082] As shown in Figures 1 to 13, in some embodiments, the support frame 133 is disposed on the first frame 121, or the support frame 133 is disposed on the second frame 122. In some embodiments, the support frame 133 is connected to one of the first frame 121 and the second frame 122 using a detachable connection or a fixed connection, for example, using bolts, snaps, or hanging connections.

[0083] In some embodiments, the material of the support frame 133 may be the same as or different from the material of the screen frame 120 , and this is not limited here.

[0084] As shown in FIG. 1 to FIG. 13 , in some embodiments, the sound unit 130 further includes a cover plate 134 , opposite ends of which are respectively connected to the support frame 133 , and the cover plate 134 is disposed on a side of the actuator 131 away from the display film 110 .

[0085] As shown in Figures 10 and 13, in some embodiments, the cover plate 134 extends along the length of the first frame 121. In this embodiment, the provision of the cover plate 134 not only helps to improve the installation stability of the exciter 131, but also improves the aesthetics of the sound unit 130.

[0086] In some embodiments, the actuator 131 and the cover plate 134 are fixedly installed by dispensing glue, and other connection methods can also be used.

[0087] As shown in Figures 1 to 13, in some embodiments, there are multiple exciters 131, and the multiple exciters 131 are spaced apart along the extension direction of the cover plate 134. In this embodiment, the provision of multiple exciters 131 can enhance the effect of vibration sound generation, resulting in a better effect. When the multiple exciters 131 are activated, the sound plate 132 vibrates and generates sound.

[0088] In some embodiments, different actuators 131 may belong to different channels, and / or, the actuators 131 of different channels may vibrate independently.

[0089] As shown in Figures 1 to 13, and Figures 27 to 30, in some embodiments, a connecting rod 150 and a slide 160 are provided on the second frame 122, the slide 160 being located in a plurality of frame segments, and the connecting rod 150 being slidably connected to the slide 160; the connecting rod 150 is constructed so that when two adjacent frame segments are folded, the connecting rod 150 is located on one of the two frame segments; when the two adjacent frame segments are unfolded, the connecting rod 150 moves in the slide 160 so that a portion of the connecting rod 150 is located on one of the two frame segments, and another portion of the connecting rod 150 is located on the other of the two frame segments. Through the above arrangement, the second frame 122, which serves as a foldable frame, can utilize the connecting rod 150 therein to be respectively inserted into the slide 160 of two adjacent frame segments to achieve the connection of the two frame segments.

[0090] FIG7 , FIG8 , and FIG9 are schematic diagrams of partial structures of the projection screen, wherein FIG8 is an enlarged view of the partial structure of FIG7 . In FIG8 , the connecting rod 150 is retracted into the chute 160 of the frame segment of the second frame 122, as a first state of the connecting rod 150 . In this first state, the screen frame 120 can be split into at least two small-sized frame structures based on different frame segments. Moreover, the connecting rod 150 is retracted into the chute 160 , further improving the transportation and installation of the small-sized frame structures. In FIG9 , a portion of the connecting rod 150 extends out of the chute 160 of the frame segment of the second frame 122 , as a second state of the connecting rod 150 . In this second state, the screen frame 120 can be connected to the chute 160 of the two frame segments by inserting a connecting rod 150 into each of the two frame segments, thereby connecting the at least two small-sized frame structures into a complete screen frame 120 . The installation operation of the screen frame 120 is simple and the connection reliability is also high.

[0091] As shown in Figures 1 to 13, and Figures 27 to 30, in some embodiments, a connecting rod 150 and a chute 160 are provided on the second frame 122, the chute 160 being located within a plurality of frame segments, the connecting rod 150 matching the chute 160 and moving within the chute 160; the connecting rod 150 is configured so that when two adjacent frame segments are folded, the connecting rod 150 is located on one of the two frame segments, and when the two adjacent frame segments are unfolded, the connecting rod 150 moves within the chute 160 so that part of the connecting rod 150 is located on one of the two frame segments and the other part of the connecting rod 150 is located on the other of the two frame segments. By matching the connecting rod 150 and the chute 160, when the second frame 122 is unfolded, the connecting rod 150 connects the unfolded second frame 122, thereby improving the stability of the unfolded screen frame 120 and preventing it from bending again. For ease of explanation, the second frame 122 can have multiple frame segments, wherein the multiple frame segments form a complete second frame 122 after unfolding.

[0092] In some embodiments, two frame segments are used as an example for description. The connecting rod 150 is disposed on one of the two frame segments. When the two frame segments are folded, the connecting rod 150 moves along with the one of the two frame segments toward the middle of the second frame 122 until it is adjacent to the second frame 122 or is accommodated within the second frame 122.

[0093] When the two frame segments are being assembled, that is, when the second frame 122 is unfolded, the two frame segments are gradually straightened from the middle of the second frame 122 until the entire second frame 122 is straightened. At this time, in order to stabilize the stability of the assembly of the two frame segments, the connecting rod 150 slides to the other frame segment through one end of the slide groove 160. At this time, the connecting rod 150 spans the two frame segments and is locked using the fasteners or screws on the connecting rod 150 to connect and fix the two frame segments, thereby fixing the second frame 122.

[0094] As shown in Figures 5 and 6, in some embodiments, the projection screen 100 also includes a hinge unit 170, and the hinge unit 170 includes a first hinge unit 171; the screen frame 120 also includes a plurality of first vertical beams 123, and the plurality of first vertical beams 123 are located in the middle of the display film 110, and the first hinge unit 171 is located between two adjacent first vertical beams 123, so that the two adjacent first vertical beams 123 can be folded.

[0095] Through the above arrangement, the first hinge unit 171 can be used to rotate and fold the part of the screen frame 120 where the two first vertical beams 123 are located together, thereby reducing the size of the entire screen frame 120, and the different parts of the screen frame 120 can also be connected into a whole using the first hinge unit 171, which is conducive to the transportation and installation of the folded screen frame 120.

[0096] As shown in Figures 5 and 6, in some embodiments, the projection screen 100 also includes a hinge unit 170, and the hinge unit 170 includes a second hinge unit 172; when at least one of the first frame 121 and the second frame 122 includes multiple frame segments, the second hinge unit 172 is located between the two frame segments to make at least one of the first frame 121 and the second frame 122 foldable.

[0097] Through the above arrangement, multiple frame segments in the first frame 121 and / or the second frame 122 can be rotatably connected using the second hinge unit 172, and different frame segments can be folded and overlapped, thereby reducing the volume of the screen frame 120. The second hinge unit 172 can be located on the first frame 121, the second frame 122, or both.

[0098] In some embodiments, the screen frame 120 has at least one of a first hinge unit 171 and a second hinge unit 172. When the screen frame 120 has the first hinge unit 171, the first vertical beam 123 is rotatably connected using the first hinge unit 171. The first vertical beam 123 is respectively connected to the opposite frame segments, which are then connected to the first frame 121. The first frame 121, the two frame segments, and the first vertical beam 123 form a smaller frame structure (as shown in FIG6). The two frame structures rotate along the first hinge unit 171 and can be spliced ​​together to form a complete rectangular screen frame 120. When the screen frame 120 has the second hinge unit 172, the two adjacent frame segments of the second frame 122 are rotatably connected using the second hinge structure 172. The two opposite frame segments are then connected to the first frame 121. The two frame segments and the first frame 121 form a concave frame structure. The two concave frame structures rotate along the second hinge structure 172 and can be spliced ​​together to form a complete rectangular and closed screen frame 120.

[0099] As shown in Figures 5 and 6, in some embodiments, when the hinge unit 170 includes a first hinge unit 171 and a second hinge unit 172, the rotation axis of the first hinge unit 171 and the rotation axis of the second hinge unit 172 coincide with each other, thereby ensuring that the screen frame 120 can be rotated and folded using the first hinge unit 171 and the second hinge unit 172 at the same time.

[0100] As shown in FIG. 1 to FIG. 17 , in some embodiments, a hinge unit 170 is further included, at least two sound-emitting units 130 are located on opposite sides of the hinge unit 170 , and the hinge unit 170 includes a first hinge unit 171 and a second hinge unit 172 .

[0101] The screen frame 120 also includes a plurality of first vertical beams 123, which are located in the middle of the display film 110. The first hinge unit 171 is located between the plurality of first vertical beams 123 so that two adjacent first vertical beams 123 can be folded. The second hinge unit 172 is located between the two frame segments so that the second frame 122 can be folded. The rotation axis of the first hinge unit 171 and the rotation axis of the second hinge unit 172 coincide with each other.

[0102] In this embodiment, the first hinge unit 171 can be set on the first vertical beam 123, the second hinge unit 172 can be set in the middle of the second frame 122, and the first vertical beam 123 can be located in the middle of the second frame 122. When folded, it means that the first hinge unit 171 and the second hinge unit 172 both begin to fold. At this time, the first vertical beam 123 and the second frame 122 are respectively in a folded state, and at least two sound-emitting units 130 located on both sides of the first vertical beam 123 gradually approach until they are close to each other. At this time, the entire projection screen 100 is in a folded state, which reduces the volume of the screen entering the home, realizes convenient entry into the home, and reduces the transportation and or entry volume.

[0103] When the entry is completed and assembly is required, it is only necessary to rotate the first hinge unit 171 and the second hinge unit 172, that is, the first hinge unit 171 and the second hinge unit 172 are both in the unfolded state, and then the first vertical beam 123 and the second frame 122 are respectively in the unfolded state, and the unfolded second frame 122 is fixed by the connecting rod 150, and at least two sound units 130 on both sides of the first vertical beam 123 gradually move away from each other. At this time, the entire screen frame 120 and the sound unit 130 are in the unfolded state.

[0104] After completing the assembly of the screen frame 120, the display film 110 is assembled and assembled to the screen frame 120. The display film 110 is tensioned by the tensioning unit 180 to improve the efficiency of folding and assembling the entire screen frame 120 and the sound unit 130.

[0105] In some embodiments, the structures of the second hinge unit 172 and the first hinge unit 171 may be the same or different.

[0106] As shown in FIG10 , in some embodiments, when the projection screen 100 includes a hinge unit 170, at least one sound-emitting unit 130 is provided on opposite sides of the hinge unit 170. With this arrangement, when the screen frame 120 can be folded using the hinge unit 170, the hinge unit 170 can divide the screen frame 120 into two opposing folding areas, each of which can be provided with at least one sound-emitting unit 130. Different sound-emitting units 130 can be folded together with their corresponding folding areas, thereby reducing the size of the entire projection screen 100.

[0107] The projection screen provided by the embodiment of the present application includes: a display film, the display film has a projection light-receiving surface; a screen frame, the screen frame includes at least two first frames and a second frame, the first frames and the second frames are alternately arranged to surround the outer periphery of the display film, wherein the length of the second frame is greater than the length of the first frame, and the second frame is a foldable frame, and the second frame includes multiple frame segments; at least two sound-emitting units, the sound-emitting unit includes an exciter and a sound-emitting plate, the sound-emitting plate is arranged on one of the first frame and the second frame, and is located on the side away from the projection light-receiving surface, the exciter is arranged on the side of the sound-emitting plate away from the display film, and is used to drive the sound-emitting plate to vibrate and produce sound, and there is a gap between the sound-emitting plate and the display film.

[0108] By arranging the screen frame and the sound-emitting units, the screen frame is foldable, and thus multiple sound-emitting units can be folded together, which can reduce the size of the projection screen when it is brought into the home, making it easier to bring it into the home, reducing transportation and the size of the projection screen, and improving the size of the projection screen. This embodiment also integrates the various structures, assembling them in the factory and then performing simple assembly at the user's home. This makes the overall installation of the projection screen more convenient and easier to operate, shortens the product assembly time, significantly reduces labor intensity, increases product influence, and enhances the user experience.

[0109] In addition, as shown in Figures 1 to 13 and Figures 27 to 30, an embodiment of the present application further provides a projection screen 100, including: a display diaphragm 110, the display diaphragm 110 having a projection light-receiving surface; a screen frame 120, the screen frame 120 is foldable; a sound unit 130, the sound unit 130 includes an exciter 131 and a sound plate 132, the sound plate 132 is arranged on the screen frame 120, and the exciter 131 is arranged on the side of the sound plate 132 away from the display diaphragm 110, for driving the sound plate 132 to vibrate and produce sound.

[0110] The projection screen provided in the embodiment of the present application, through the arrangement of the screen frame and the sound-emitting unit, is foldable. Since the screen frame is foldable, multiple sound-emitting units can be folded together. This can reduce the volume of the projection screen when it is brought into the home, making it easier to bring it into the home, reducing the transportation and / or volume required for bringing it into the home, optimizing the size of the projection screen, and improving the problem of bringing large-sized projection screens with sound-emitting units into the home. Furthermore, this embodiment integrates the various structures, assembling them in the factory and then performing simple assembly at the user's home. This makes the overall installation of the projection screen more convenient and easier to operate, shortens the product assembly time, significantly reduces labor intensity, increases product influence, and enhances user experience.

[0111] Furthermore, in related art, laser TV sound screens consist of a sound plate, an exciter, a diaphragm, and a frame. Sound is primarily produced by the exciter vibrating the sound plate, which requires a frame and screws to secure the exciter. However, after installation, the heavy exciter can cause deformation of the diaphragm's display layer. This vibration during sound generation can cause screen jitter, impacting viewing experience.

[0112] In order to overcome the defects in the prior art, the projection screen provided in the embodiment of the present application can be installed by matching the sound unit with the vertical beam. Compared with traditional speakers, the piezoelectric speaker in the sound unit has the advantages of being light, thin, and efficient. Therefore, the piezoelectric speaker can be combined with the screen frame to improve the installation strength of the piezoelectric speaker. Since the piezoelectric speaker is installed in the cavity of the vertical beam, the vertical beam can protect the piezoelectric speaker to avoid damage. At the same time, while ensuring sound, the piezoelectric speaker can be prevented from directly contacting the display diaphragm, thereby affecting the projection effect of the display diaphragm. In addition, the piezoelectric speaker and the coordination with the sound board ensure that the sound unit makes sound, which makes it easy to achieve the unity of sound and picture, improves the sound pressure value of the ultra-thin frame-type sounding projection screen, has high sound transmission efficiency and low loss, improves the acoustic effect of the sounding projection screen, improves the product influence, and improves the user experience.

[0113] As shown in Figures 14, 15 and 16, in some embodiments, the screen frame 120 includes a second vertical beam 124, the second vertical beam 124 has a cavity 140; a sound unit 130, the sound unit 130 is located in the cavity 140, a resonance cavity is formed between the sound unit 130 and the second vertical beam 124, the resonance cavity is located in the cavity 140, and the end of the resonance cavity facing the display membrane 110 has a sound expansion hole 143.

[0114] Through the above arrangement, the matching installation arrangement of the sound unit 130 and the second vertical beam 124 is achieved, and the sound unit 130 is combined with the screen frame 120, which can improve the installation strength of the sound unit 130. Since the sound unit 130 is installed in the cavity 140 of the second vertical beam 124, the second vertical beam 124 can protect the sound unit 130 from damage. While ensuring normal sound, the sound unit 130 can be prevented from directly contacting the display film 110, thereby affecting the projection effect of the display film 110.

[0115] As shown in FIG. 2 and FIG. 14 to FIG. 17 , an embodiment of the present application provides a projection screen 100 , including: a display film 110 , the display film 110 having a projection light-receiving surface; it can be understood that the front side of the display film 110 is the projection light-receiving surface. The screen frame 120 includes an inner frame and a second vertical beam 124. The inner frame is arranged around the outer periphery of the display diaphragm 110. The second vertical beam 124 is arranged on the inner frame. The second vertical beam 124 has a cavity. The sound unit 130 is located in the cavity 140. A resonance cavity is formed between the sound unit 130 and the second vertical beam 124. The resonance cavity is located in the cavity 140. The end of the resonance cavity facing the display diaphragm 110 has a sound expansion hole 143. The sound unit 130 includes an exciter 131 and a sound plate 132. The sound plate 132 is arranged on the second vertical beam 124. The exciter 131 is arranged on the side of the sound plate 132 away from the display diaphragm 110, and is used to drive the sound plate 132 to vibrate and make sound. The exciter 131 is a piezoelectric speaker.

[0116] Through the above-mentioned arrangement, the sound unit 130 and the matching installation arrangement with the second vertical beam 124 are arranged. Compared with traditional speakers, the sound unit 130 uses a piezoelectric speaker as the exciter 131, which has the advantages of being light, thin, and efficient. Therefore, the exciter 131 can be combined with the screen frame 120, which can improve the installation strength of the exciter 131. Since the exciter 131 is installed in the cavity 140 of the second vertical beam 124, the second vertical beam 124 can protect the exciter 131 to prevent damage. At the same time, while ensuring sound, the exciter 131 can be prevented from directly contacting the display diaphragm 110, thereby affecting the projection effect of the display diaphragm 110. In addition, the cooperation between the exciter 131 and the sound plate 132 ensures that the sound unit 130 produces sound, which makes it easy to achieve the unity of sound and picture, improves the sound pressure value of the ultra-thin frame-type sound projection screen, has high sound transmission efficiency and low loss, improves the acoustic effect of the sound projection screen, improves product influence, and improves user experience.

[0117] In some embodiments, the inner frame is a frame-shaped structure formed by alternating first frames 121 and second frames 122 .

[0118] A piezoelectric speaker is a device that uses the piezoelectric effect to generate sound. The piezoelectric effect refers to the fact that when certain materials are subjected to mechanical pressure or deformation, they will produce an uneven distribution of electric charges, thereby generating an electric field. Conversely, when the electric field is applied, the material will also undergo mechanical deformation. This effect is widely used in devices such as sensors, vibrators, and speakers. It should be noted that the working principle of the exciter 131 using a piezoelectric speaker is to vibrate the piezoelectric material by applying an alternating electric field, thereby generating sound waves in the air. Unlike traditional magnetic speakers, it does not require magnets and electromagnetic coils, so the structure is relatively simple and the size is light and thin. Therefore, the exciter 131 can be applied to the frame-type projection screen 100, so that the frame-type projection screen 100 can achieve the integration of sound and picture while satisfying the projection effect.

[0119] In the embodiment of the present application, the sound-emitting unit 130 utilizes the inverse piezoelectric effect of the piezoelectric material, thereby making the projection screen 100 rely on the exciter 131 to emit sound. This exciter 131 has a simple structure, a small size, a high sound transmission efficiency, a small energy loss, and a good sound effect. Piezoelectric material is a material that can convert mechanical energy and electrical energy into each other. When an alternating voltage is applied to the piezoelectric material, the piezoelectric material will undergo mechanical deformation, thereby driving the air to vibrate and emit sound. The exciter 131 is set on the sound-emitting plate 132, which can drive the sound-emitting plate 132 to vibrate and emit sound, and then the sound generated inside the second vertical beam 124 pushes the air to transmit the sound to the display diaphragm 110, which has a good acoustic effect and is easy to achieve the unity of sound and picture.

[0120] In the embodiment of the present application, the display film 110 can reflect the projection light emitted by the projection device, thereby realizing the projection of the picture. In addition, the projection device can drive each actuator 131 to vibrate, thereby stimulating the sound plate 132 to vibrate together, so that the sound plate 132 can emit sound.

[0121] Because the sounding plate 132 and the exciter 131 are both fixed to the second vertical beam 124, the sounding plate 132 and the display membrane 110 are ensured to be in the same area. This allows the sound to be emitted from the screen, avoiding the situation where the screen and sound are inconsistent, and improving the projection effect of the projection system. In some embodiments, the skin material of the sounding plate 132 used in the resonance cavity is a carbon fiber glass fiber or carbon fiber reinforced material with an epoxy resin wet molded surface layer, and the honeycomb core is an aramid honeycomb core.

[0122] In some embodiments, there is a gap between the sound expansion hole 143 and the display membrane 110 , and the size of the gap ranges from 1 mm to 3 mm.

[0123] It should be noted that there is a gap between the sound expansion hole 143 and the display diaphragm 110, which means that there is a gap between the sound unit 130 and the display diaphragm 110. In other words, the exciter 131 does not directly contact the display diaphragm 110. Generally, the display diaphragm 110 includes a diaphragm body and a synthetic fabric that are bonded to each other. Although the hardness of the diaphragm body material is higher than that of the synthetic fabric, the entire diaphragm body is relatively soft. If the sound plate 132 and the exciter 131 are directly placed on the diaphragm body or the synthetic fabric, the gravity of the sound plate 132 and the exciter 131 will cause the entire display diaphragm 110 to deform under the factor of gravity. The vibration during sound generation will cause the image to shake, affecting the viewing experience. Therefore, the sound plate 132 and the exciter 131 do not directly contact the display diaphragm 110. While ensuring sound generation, the projection effect of the display diaphragm 110 can be improved, the product's impact can be enhanced, the user experience can be improved, and ultimately the sound and picture integration effect is better.

[0124] In some embodiments, the gap between the sound expansion hole 143 of the second vertical beam 124 and the display membrane 110 is in the range of 1 mm to 3 mm.

[0125] As shown in Figures 2 and 14 to 19, in some embodiments, there are multiple second vertical beams 124, which are spaced apart along the length of the screen frame 120. The second vertical beams 124 are provided on the screen frame 120 to improve the stability of the screen frame 120.

[0126] In some embodiments, there may be multiple second vertical beams 124 , and multiple sound-emitting units 130 may be set in each second vertical beam 124 . The multiple sound-emitting units 130 may be spaced apart along the length direction of the second vertical beam 124 , wherein the length direction of the second vertical beam 124 is consistent with the width direction of the screen frame 120 .

[0127] In some embodiments, the screen frame 120 includes an inner frame formed by a first frame 121 and a second frame 122 , and a plurality of second vertical beams 124 are spaced apart along the length direction of the inner frame.

[0128] In addition, it should be noted that the provision of multiple sound units 130 can perform one-to-one matching for different areas of the display membrane 110, so that the sound effects presented by different areas of the display membrane 110 are consistent, and can also be applied to large-sized display membranes 110.

[0129] In some embodiments, the number of the second vertical beams 124 and the number of the sound generating units 130 can be adjusted according to actual conditions.

[0130] As shown in Figure 2 and Figures 14 to 19, in some embodiments, two support columns 125 are provided on the second vertical beam 124. The two support columns 125 are located on opposite sides of the sound expansion hole 143. The support columns 125 are connected to the side walls of the resonance cavity and extend toward the middle of the resonance cavity.

[0131] In some embodiments, the two support columns 125 are located on opposite sides of the sound expansion hole 143, the support column 125 on one side of the sound expansion hole 143 is connected to the side wall of one side of the sound plate 132, and the support column 125 on the other side of the sound expansion hole 143 is connected to the side wall of the other side of the sound plate 132, wherein the length direction of the sound plate 132 is consistent with the connection direction between the two support columns 125.

[0132] In some embodiments, the support column 125 and the second vertical beam 124 may be made of the same material, for example, both are metal pieces, or they may be made of different materials.

[0133] In some embodiments, the support column 125 and the second vertical beam 124 are connected in an integral manner. In other embodiments, the support column 125 and the second vertical beam 124 may be connected in other manners. Any manner that can securely connect the support column 125 and the second vertical beam 124 can achieve the purpose of this embodiment. The manner in which the support column 125 and the second vertical beam 124 are connected is not limited.

[0134] As shown in Figure 2 and Figures 14 to 19, in some embodiments, the sound unit 130 includes an exciter 131 and a sounding plate 132. The sounding plate 132 is mounted on the support column 125 so that the sounding plate 132 is suspended within the cavity 140. The exciter 131 is located on the side of the sounding plate 132 facing away from the display membrane 110 and is used to drive the sounding plate 132 to vibrate and produce sound. The exciter 131 is a piezoelectric speaker. The exciter 131 and sounding plate 132 of the sound unit 130 can be mounted using the support column 125 on the second vertical beam 124, providing high installation reliability.

[0135] In some embodiments, the actuator 131 is a piezoelectric speaker. Using a piezoelectric speaker as the actuator 131 has the advantages of simple structure, small size, high sound transmission efficiency, low energy loss, and good sound effect.

[0136] As shown in FIG2 and FIG14 to FIG19 , in some embodiments, the sounding plate 132 is disposed on the support column 125 so that the sounding plate 132 is suspended in the cavity 140. The provision of the support column 125 can provide stability for the installation of the exciter 131 and the sounding plate 132.

[0137] In some embodiments, the sounding plate 132 and the support column 125 are connected by glue dispensing, or by other connection methods.

[0138] It should be noted that to increase the sound pressure of the display diaphragm 110 below the screen frame 120, the exciter 131, the sound plate 132, and the middle second vertical beam 124 form a resonance cavity. The exciter 131 divides the cavity 140 into a front cavity and a rear cavity. The size of the front cavity, the area of ​​the sound expansion hole 143, and the connection point of the sound plate 132 are designed to improve the sound pressure of the ultra-thin projection screen 100. The cavity 140 is divided into a front cavity and a rear cavity. The front cavity mainly affects the high frequency part, while the rear cavity mainly affects the low frequency part. The addition of the sound expansion hole 143 also increases the sound pressure.

[0139] In order to obtain a higher sound pressure, the resonant frequency of the driver 131 needs to match the resonant frequency of the resonance cavity, which can effectively increase the sound pressure. The formula for calculating the resonant frequency of the resonance cavity is:

[0140] Where c is the speed of sound in air; V is the volume of the front cavity; S is the area of ​​the sound hole 143; t is the wall thickness of the sound hole; a is the radius of the sound hole 143; and λ is the correction factor, which is set to 1.3. It can be seen that the resonant frequency of the sound cavity is related to the size of the sound hole 143, the cavity volume, and the wall thickness of the second vertical beam 124.

[0141] As shown in Figures 2 and 14 to 20, in some embodiments, the front sound cavity serves as the sound-emitting unit 130, and the front cavity height h should not be too small. If it is too small, the buzzer plate of the exciter 131 will collide with the second vertical beam 124 during vibration. If it is too large, it will cause large energy loss during vibration and cause a drop in sound pressure. Different front sound cavity heights are tested under a certain area of ​​the sound expansion hole 143. When the front cavity height is 3mm<a<6mm, the sound pressure is significantly improved.

[0142] In some embodiments, the front cavity height can be 3.5 mm, 4 mm, 4.5 mm, 5 mm, or 5.5 mm, or any value therebetween.

[0143] As shown in Figures 2 and 14 to 21, the resonance chamber composed of the exciter 131 and the second vertical beam 124 has a certain resonance frequency. The sound expansion hole 143 of the second vertical beam 124 is designed at a certain resonance frequency, and different sizes of the sound expansion holes 143 are tested and the sound pressure data are compared. It can be optimized that the aperture of the sound expansion hole 143 should be 0.6mm<a<1.3mm, and the sound pressure value of the projection screen 100 will be greatly improved.

[0144] In some embodiments, the diameter of the sound expansion hole 143 can be 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, or any value in between.

[0145] As shown in FIG. 2 and FIG. 14 to FIG. 23 , in some embodiments, two support columns 125 are connected to opposite ends of the sounding plate 132 ; or, two support columns 125 are connected to the middle of the sounding plate 132 .

[0146] It should be noted that the resonant frequency of the exciter 131 has different effects depending on the position of the support column 125 and can be designed according to the requirements of different frequency response curves. The following formula can be used as a reference:

[0147] It should be noted that, in the formula, α is the correction coefficient of the composite, and the correction coefficients corresponding to the composites composed of different piezoelectric ceramics and sound plates 132 are different; r0 is the radius of the exciter 131; t0 is the thickness of the exciter 131 (the total thickness of the exciter 131 and the sound plate 132); Y0 is the Young's modulus; ρ is the composite density of the composite; and σ is the Poisson's ratio.

[0148] As shown in Figures 2 and 14 to 24, in some embodiments, when support column 125 is connected to the center region of sounding plate 132 and the support column 125 matches the edge of driver 131, support column 125 is fixed in an annular structure approximately the same size as the diameter of the ceramic plate of driver 131. Node support has low resonance damping and is suitable for scenarios requiring high sound pressure. The frequency response curve is steep, and the maximum sound pressure is at the resonance point.

[0149] As shown in Figures 2 and 14 to 25, in some embodiments, when support column 125 is located at the outer edge of the end of sounding plate 132, that is, the outer edge of sounding plate 132 is fixed in the resonance cavity. This outer edge support provides relatively greater damping and can produce a flatter frequency response curve.

[0150] As shown in FIG. 2 and FIG. 14 to FIG. 26 , in some embodiments, when the resonant frequency of the exciter 131 matches the resonant frequency of the resonance cavity, the sound pressure can be effectively increased.

[0151] As shown in Figures 2 and 14 to 26, in some embodiments, the second vertical beam 124 includes a vertical beam body 1241 and a cover plate 1242. The vertical beam body 1241 has an opening, and the cover plate 1242 is covered on the opening to form a resonance cavity with the vertical beam body 1241; the exciter 131 faces the cover plate 1242 and has a gap between it and the cover plate 1242.

[0152] In this embodiment, the arrangement of the vertical beam body 1241 and the cover plate 1242 facilitates the installation of the sound unit 130. After the sound unit 130 is installed, the cover plate 1242 is closed on the opening to protect the exciter 131 and the sound plate 132 in the sound unit 130.

[0153] In some embodiments, the vertical beam body 1241 and the cover plate 1242 are detachably connected. It should be noted that by setting the vertical beam body 1241 and the cover plate 1242 as a detachable connection, the sound unit 130 inside the vertical beam body 1241 can be installed and removed, making it easier to use and maintain the sound unit 130.

[0154] In addition, it should be noted that the opening and the sound expansion hole 143 are arranged opposite to each other, wherein the opening and the sound expansion hole 143 are respectively located on opposite sides of the vertical beam body 1241, and the cover plate 1242 covers the opening to form a resonance cavity between the vertical beam body 1241.

[0155] As shown in Figures 16 and 17, in some embodiments, the exciter 131 divides the cavity 140 into a first cavity 141 and a second cavity 142. The first cavity 141 is a resonance cavity and has a sound expansion hole 143. The second cavity 142 wraps part of the first cavity 141.

[0156] It should be noted that the first cavity 141 is the front cavity, the second cavity 142 is the rear cavity, the first cavity 141 mainly affects the high-frequency part, the second cavity 142 mainly affects the low-frequency part, and the sound expansion hole 143 is added to increase the sound pressure.

[0157] The projection screen provided by the embodiment of the present application includes: a display diaphragm, the display diaphragm has a projection light-receiving surface; a screen frame, the screen frame includes an inner frame and vertical beams, the inner frame is arranged around the outer periphery of the display diaphragm, the vertical beams are arranged on the inner frame, and the vertical beams have a cavity; a sound-emitting unit, the sound-emitting unit is located in the cavity, a resonance cavity is formed between the sound-emitting unit and the vertical beam, the resonance cavity is located in the cavity, and the end of the resonance cavity facing the display diaphragm has a sound expansion hole, the sound-emitting unit includes a piezoelectric speaker and a sound-emitting plate, the sound-emitting plate is arranged on the vertical beam, and the piezoelectric speaker is arranged on the side of the sound-emitting plate away from the display diaphragm, for driving the sound-emitting plate to vibrate and produce sound.

[0158] By matching the sound unit with the vertical beam, the piezoelectric speaker in the sound unit has the advantages of being light, thin, and efficient compared to traditional speakers. Therefore, the piezoelectric speaker can be combined with the screen frame to improve the installation strength of the piezoelectric speaker. Since the piezoelectric speaker is installed in the cavity of the vertical beam, the vertical beam can protect the piezoelectric speaker to avoid damage. At the same time, while ensuring sound, the piezoelectric speaker can be prevented from directly contacting the display diaphragm, thereby affecting the projection effect of the display diaphragm. In addition, the piezoelectric speaker and the coordination with the sound board ensure that the sound unit produces sound, making it easy to achieve the unity of sound and picture, and improving the sound pressure value of the ultra-thin frame sound projection screen. The sound transmission efficiency is high and the loss is small, thereby improving the acoustic effect of the sound projection screen, increasing the product influence, and improving the user experience.

[0159] In addition, as shown in Figures 2 and 14 to 26, the embodiment of the present application further provides a projection screen 100, comprising: a display diaphragm 110, the display diaphragm 110 having a projection light-receiving surface; a screen frame 120, the screen frame 120 including a second vertical beam 124, the second vertical beam 124 having a cavity. A sound-emitting unit 130 is located in the cavity, and a resonance cavity is formed between the sound-emitting unit 130 and the second vertical beam 124. The end of the resonance cavity facing the display diaphragm 110 has a sound expansion hole 143. The sound-emitting unit 130 includes an exciter 131 and a sound-emitting plate 132. The exciter 131 is used to drive the sound-emitting plate 132 to vibrate and produce sound.

[0160] The projection screen provided by the embodiment of the present application has a sound unit and a matching installation setting with the vertical beam. Compared with the traditional speaker, the piezoelectric speaker in the sound unit has the advantages of being light, thin, and efficient. Therefore, the piezoelectric speaker can be combined with the screen frame to improve the installation strength of the piezoelectric speaker. Since the piezoelectric speaker is installed in the cavity of the vertical beam, the vertical beam can protect the piezoelectric speaker to avoid damage. At the same time, while ensuring sound, the piezoelectric speaker can be prevented from directly contacting the display diaphragm, thereby affecting the projection effect of the display diaphragm. In addition, the piezoelectric speaker and the coordination with the sound board ensure that the sound unit makes sound, which makes it easy to achieve the unity of sound and picture, improves the sound pressure value of the ultra-thin frame-type sounding projection screen, has high sound transmission efficiency and low loss, improves the acoustic effect of the sounding projection screen, enhances the product influence, and improves the user experience.

[0161] In addition, an embodiment of the present application further provides a projection system, comprising a projection device and the aforementioned projection screen 100, wherein the projection device is configured to project a projection image onto the projection screen 100. The projection system provided in this embodiment specifically comprises a projection device and the projection screen 100 of the aforementioned embodiment, wherein the projection device is configured to project a projection image onto the display film 110 of the projection screen 100.

[0162] Specifically, in the projection system of this embodiment, the projection device can be any existing projector, such as a laser projector, which can project a projection image onto the display film 110 of the projection screen 100, and the display film 110 can display the projection image for people to watch.

[0163] The projection system provided in this embodiment, wherein the specific structure, working principle and function of the projection screen 100 have been described in detail in the above embodiments, and will not be repeated here.

[0164] On the one hand, the arrangement of the screen frame and the sound unit allows for the foldability of the screen frame, which in turn allows for the foldability of multiple sound units. This reduces the size of the projection screen when it is brought into the home, making it easier to bring it into the home, reducing transportation and / or bringing it into the home, optimizing the size of the projection screen, and improving the problem of bringing large projection screens with sound units into the home. Furthermore, this embodiment integrates the various structures, assembling them in the factory and then performing simple assembly at the user's home. This makes the overall installation of the projection screen more convenient and easier to operate, shortens product assembly time, significantly reduces labor intensity, increases product impact, and enhances user experience.

[0165] On the other hand, by matching the sound unit with the second vertical beam for installation, compared with traditional speakers, the piezoelectric speaker has the advantages of being light, thin, and efficient, and the piezoelectric speaker can be combined with the screen frame to improve the installation strength of the piezoelectric speaker. Since the piezoelectric speaker is installed in the cavity of the second vertical beam, the second vertical beam can protect the piezoelectric speaker to avoid damage. At the same time, while ensuring sound, the piezoelectric speaker can be prevented from directly contacting the display diaphragm, thereby affecting the projection effect of the display diaphragm. In addition, the piezoelectric speaker and the coordination with the sound board ensure that the sound unit makes sound, which makes it easy to achieve the unity of sound and picture, improves the sound pressure value of the ultra-thin frame sound projection screen, has high sound transmission efficiency and low loss, improves the acoustic effect of the sound projection screen, enhances the product influence, and improves the user experience.

[0166] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A projection screen (100), characterized in that: The projection screen (100) comprises: A display film (110), wherein the display film (110) has a projection light receiving surface; A screen frame (120), wherein the screen frame (120) is foldable; A sound generating unit (130), the sound generating unit (130) being located on a side of the display film (110) opposite to the projection light receiving surface.

2. The projection screen (100) according to claim 1, characterized in that The screen frame (120) comprises a first frame (121) and a second frame (122); The first frame (121) and the second frame (122) are alternately arranged to surround the outer periphery of the display film (110), wherein at least one of the first frame (121) and the second frame (122) is a foldable frame and includes a plurality of frame segments; The sound-generating unit (130) is connected to one of the first frame (121) and the second frame (122).

3. The projection screen (100) according to claim 2, characterized in that The length of the second frame (122) is greater than that of the first frame (121), the second frame (122) is a foldable frame, and the second frame (122) includes a plurality of frame segments.

4. The projection screen (100) according to claim 2 or 3, characterized in that The projection screen (100) further includes a hinge unit (170), wherein the hinge unit (170) includes a first hinge unit (171); The screen frame (120) further comprises a plurality of first vertical beams (123), wherein the plurality of first vertical beams (123) are located in the middle of the display film (110), and the first hinge unit (171) is located between two adjacent first vertical beams (123), so that the two adjacent first vertical beams (123) are foldable.

5. The projection screen (100) according to any one of claims 2 to 4, characterized in that The projection screen (100) further includes a hinge unit (170), wherein the hinge unit (170) includes a second hinge unit (172); When at least one of the first frame (121) and the second frame (122) includes a plurality of frame segments, the second hinge unit (172) is located between two of the frame segments to enable at least one of the first frame (121) and the second frame (122) to be foldable.

6. The projection screen (100) according to claim 2 or 3, characterized in that The frame segment is provided with a connecting rod (150) and a sliding groove (160); The sliding groove (160) is located in the plurality of frame segments, and the connecting rod (150) is slidably connected to the sliding groove (160); The connecting rod (150) is constructed such that when two adjacent frame segments are folded, the connecting rod (150) is located on one of the two frame segments; when the two adjacent frame segments are unfolded, the connecting rod (150) moves in the sliding groove (160) so that a portion of the connecting rod (150) is located on one of the two frame segments and another portion of the connecting rod (150) is located on the other of the two frame segments.

7. The projection screen (100) according to any one of claims 1 to 6, characterized in that The number of the sound-generating units (130) is at least two; each of the sound-generating units (130) is connected to the screen frame (120) respectively.

8. The projection screen (100) according to claim 7, characterized in that When the projection screen (100) includes a hinge unit (170), at least one sound-generating unit (130) is respectively provided on two opposite sides of the hinge unit (170).

9. The projection screen (100) according to any one of claims 1 to 8, characterized in that The sound-generating unit (130) comprises an exciter (131) and a sound-generating plate (132); the sound-generating plate (132) is located on a side of the display diaphragm (110) opposite to the projection light-receiving surface; the exciter (131) is located on a side of the sound-generating plate (132) away from the display diaphragm (110) and is used to drive the sound-generating plate (132) to vibrate and generate sound; a gap is provided between the sound-generating plate (132) and the display diaphragm (110).

10. The projection screen (100) according to claim 9, characterized in that The sound-generating unit (130) further includes a supporting frame (133), and the supporting frame (133) is arranged on the screen frame (120); The sounding plate (132) is arranged on the supporting frame (133), and the supporting frame (133) is used to support the sounding plate (132) and the exciter (131).

11. The projection screen (100) according to claim 10, characterized in that The sound-generating unit (130) further includes a cover plate (134), both ends of the cover plate (134) are respectively connected to the support frame (133), and the cover plate (134) is arranged on a side of the actuator (131) facing away from the display film (110); and / or, The cover plate (134) extends along the width direction of the screen frame (120).

12. The projection screen (100) according to claim 11, characterized in that There are a plurality of exciters (131) in each sound-generating unit (130), and the plurality of exciters (131) are arranged at intervals along the extension direction of the cover plate (134).

13. The projection screen (100) according to any one of claims 1 to 6, characterized in that The screen frame (120) includes a second vertical beam (124), and the second vertical beam (124) has a cavity (140); A sound-generating unit (130) is located in the cavity (140), a resonance cavity is formed between the sound-generating unit (130) and the second vertical beam (124), the resonance cavity is located in the cavity (140), and one end of the resonance cavity facing the display film (110) has a sound expansion hole (143).

14. The projection screen (100) according to claim 13, characterized in that There is a gap between the sound expansion hole (143) and the display membrane (110), and the size of the gap ranges from 1 mm to 3 mm.

15. The projection screen (100) according to claim 14, characterized in that There are a plurality of second vertical beams (124), and the plurality of second vertical beams (124) are arranged at intervals along the length direction of the screen frame (120).

16. The projection screen (100) according to any one of claims 13 to 15, characterized in that The second vertical beam (124) is provided with two support columns (125), and the two support columns (125) are respectively located on opposite sides of the sound expansion hole (143). The support columns (125) are connected to the side walls of the resonance cavity and extend toward the middle of the resonance cavity.

17. The projection screen (100) according to claim 16, characterized in that The sound-generating unit (130) includes an exciter (131) and a sound-generating plate (132); the sound-generating plate (132) is arranged on the support column (125), so that the sound-generating plate (132) is suspended in the cavity (140); The exciter (131) is arranged on a side of the sound-generating plate (132) away from the display membrane (110), and is used to drive the sound-generating plate (132) to vibrate and generate sound.

18. The projection screen (100) according to claim 17, characterized in that The exciter (131) is a piezoelectric speaker.

19. The projection screen (100) according to claim 17, characterized in that The two support columns (125) are connected to opposite ends of the sounding plate (132); or, the two support columns (125) are connected to the middle of the sounding plate (132).

20. The projection screen (100) according to claim 17, characterized in that The second vertical beam (124) comprises a vertical beam body (1241) and a cover plate (1242); the vertical beam body (1241) has an opening; the cover plate (1242) is arranged on the opening to form the resonance cavity with the vertical beam body (1241); The exciter (131) faces the cover plate (1242) and has a gap between the exciter (131) and the cover plate (1242).

21. The projection screen (100) according to any one of claims 13 to 20, characterized in that The sound-generating unit (130) divides the cavity (140) into a first cavity (141) and a second cavity (142); the first cavity (141) is the resonance cavity and has the sound expansion hole (143); and the second cavity (142) partially encloses the first cavity (141).

22. The projection screen (100) according to any one of claims 1 to 21, characterized in that The projection screen (100) further includes a tensioning unit (180); The tensioning unit (180) includes a pull rod (181) and a tensioning member (182), wherein the pull rod (181) is connected to the end of the display film (110), and the tensioning member (182) is movably connected to the screen frame (120). The tensioning member (182) abuts against the pull rod (181), and the movement of the tensioning member (182) can drive the pull rod (181) to move, and the pull rod (181) applies tensioning force to the end of the display film (110).

23. The projection screen (100) according to claim 22, characterized in that The moving direction of the tensioning member (182) matches the moving direction of the pull rod (181); and / or the moving direction of the tensioning member (182) matches the stretching direction of the display film (110).

24. A projection system, characterized in that: The projection system comprises a projection device and a projection screen (100) according to any one of claims 1 to 23, wherein the projection device is used to project a projection picture onto the projection screen (100).

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