Projection screens and projection display devices

Abstract

This invention discloses a projection screen and projection display device to solve the problem of uneven appearance of projection screens in related technologies. The projection screen has a first receiving cavity in its first storage section; a first opening is provided on the first wall panel of the first storage section. A rolling mechanism is disposed within the first receiving cavity and connected to a first side of the screen. A lifting mechanism includes a lifting component and a crossbeam; at least a portion of the lifting component is disposed within the first receiving cavity and is drively connected to the crossbeam; the crossbeam is connected to a second side of the screen. A first cover plate is located around the crossbeam. At least one elastic mechanism is connected to the first cover plate and the crossbeam; the elastic mechanism is used to: when the screen is unfolded, bring the first cover plate into contact with the crossbeam; when the screen is retracted, separate the first cover plate from the crossbeam and seal the first opening. The projection screen provided by this invention, under the action of the rolling mechanism and the elastic mechanism, allows the first cover plate to fit snugly against the edge of the first opening, resulting in a flat appearance for the projection screen.

Description

Technical Field

[0001] This invention relates to the field of projection display technology, and more particularly to a projection screen and projection display device. Background Technology

[0002] Laser projection display technology is an optical display technology that uses semiconductor lasers to convert electrical energy into light energy, and then projects the laser onto a screen through an optical system, a circuit system, and a lens system.

[0003] In existing technology, a common type of projection screen is the lift-up screen. When the projection display device is working, the screen can be raised and unfolded to receive the light beam from the projector for image display. When the projection display device is not working, the screen can be rolled up and stored in the storage compartment to reduce the space occupied. Therefore, the storage compartment for storing the screen has an opening for the screen to pass through, and the opening is usually designed with a cover plate structure.

[0004] The cover plate structure in the related technology uses a motor-driven linkage mechanism to rotate the cover plate to open or close the opening. The structure is relatively complex, and due to processing and assembly errors, one end of the cover plate will lift up when closing the opening, resulting in an uneven appearance of the projection screen and poor aesthetics. Summary of the Invention

[0005] The purpose of this invention is to provide a projection screen and projection display device to solve the problem of uneven appearance when the cover plate of the projection screen seals the opening in the related art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] On one hand, some embodiments of the present invention provide a projection screen, including a first storage portion, a screen, a roll-up mechanism, a lifting mechanism, a first cover plate, and at least one elastic mechanism. The first storage portion has a first receiving cavity; the first storage portion includes a first wall panel with a first opening communicating with the first receiving cavity. The screen has opposing first and second sides. The roll-up mechanism is disposed within the first receiving cavity and connected to the first side. The lifting mechanism includes a lifting assembly and a crossbeam; at least a portion of the lifting assembly is disposed within the first receiving cavity and is drively connected to the crossbeam; the crossbeam is connected to the second side; the lifting mechanism and the roll-up mechanism cooperate to allow the screen to be retracted and rolled onto the roll-up mechanism, or to pass through the first opening and unfold. The first cover plate is located around the crossbeam. At least one elastic mechanism is connected to the first cover plate and the crossbeam; the elastic mechanism is used to: when the screen is unfolded, cause the first cover plate to contact the crossbeam; when the screen is retracted, cause the first cover plate to separate from the crossbeam and seal the first opening.

[0008] In some embodiments, the crossbeam has a first surface with a mounting groove. The elastic mechanism includes a spring, one end of which is connected to the first cover plate, and the other end is located within the mounting groove and connected to the groove wall.

[0009] In some embodiments, the bottom of the mounting groove has a second opening. The crossbeam also has a second surface disposed opposite to the first surface; the second surface has a third opening that exposes the second opening. The elastic mechanism further includes: a fastener mounted at the second opening and connected to the groove wall of the mounting groove; and a spring connected to the fastener.

[0010] In some embodiments, the fastener is annular, and its outer peripheral surface abuts against the sidewall of the second opening; the outer peripheral surface of the fastener has a positioning groove. The sidewall of the second opening has a positioning hole. The elastic mechanism further includes a positioning pin, one end of which engages with the positioning groove, and the other end of which engages with the positioning hole.

[0011] In some embodiments, the crossbeam has a first guide hole. The projection screen further includes: a first guide post, one end of which is connected to a first cover plate; at least a portion of the first guide post is located within the first guide hole.

[0012] In some embodiments, the first panel has a second guide hole. The projection screen further includes a second guide post, one end of which is connected to the first cover plate; the second guide post is used to mate with the second guide hole.

[0013] In some embodiments, the sidewall of the first opening is stepped; the second guide hole is located on the stepped surface of the sidewall of the first opening. When the first cover plate seals the first opening, the first cover plate abuts against the stepped surface of the sidewall of the first opening, and the surface of the first cover plate away from the first receiving cavity is flush with the surface of the first wall plate away from the first receiving cavity.

[0014] In some embodiments, the end of the first guide post away from the first cover plate is tapered; and / or, the end of the second guide post away from the first cover plate is tapered.

[0015] In some embodiments, the crossbeam further includes opposing third and fourth surfaces, which are located on the same side of the first surface and are both in contact with it. The first cover plate includes a top plate, a first side plate, and a second side plate. The top plate is parallel to the first surface of the crossbeam; a spring is connected to the top plate. The first side plate is connected to the top plate and parallel to the third surface. The second side plate is connected to the top plate and parallel to the fourth surface; the second side plate and the first side plate are located on the same side of the top plate, and a portion of the crossbeam is located within the space enclosed by the second side plate, the first side plate, and the top plate.

[0016] In some embodiments, the projection screen further includes: two end plates, which are respectively covered at both ends of the crossbeam; the end plates include a first peripheral side, a second peripheral side and a third peripheral side connected in sequence, the first peripheral side is flush with the surface of the first side plate away from the second side plate, the third peripheral side is flush with the surface of the second side plate away from the first side plate, and the second peripheral side is flush with the first surface.

[0017] On the other hand, some embodiments of the present invention provide a projection display device, including: a projection screen, a second storage portion, and a projection host as described in any of the above embodiments. The second storage portion is connected to the first storage portion and has a second receiving cavity; the second storage portion also has a light emission port. The projection host is disposed in the second receiving cavity. The light emission port is used to transmit light beams emitted from the projection host; when the projection screen is unfolded, it receives the light beams from the projection host to display an image.

[0018] The projection screen and projection display device provided by this invention have the following beneficial effects:

[0019] In summary, the projection screen provided by the present invention, by having a first receiving part with a first receiving cavity, the first receiving part including a first wall panel with a first opening, and a rolling mechanism disposed within the first receiving cavity and connected to a first side of the screen, allows the screen to be rolled up onto the rolling mechanism when it is folded into the first receiving cavity; by disposing at least a portion of the lifting component of the lifting mechanism within the first receiving cavity and being drivenly connected to a crossbeam, and the crossbeam being connected to a second side of the screen, the lifting component can drive the crossbeam to move closer to the first receiving cavity when the rolling mechanism rotates to fold up the screen, so that the screen can be rolled up onto the rolling mechanism. When the screen is released, the lifting assembly can drive the crossbeam to move away from the first receiving cavity so that the screen can pass through the first opening and unfold. By setting the first cover plate on the periphery of the crossbeam, the elastic mechanism is connected to the first cover plate and the crossbeam, so that when the screen is unfolded, the first cover plate can contact the crossbeam, thereby making the first cover plate and the crossbeam visually integrated. When the screen is retracted, under the pulling force of the rolling mechanism, the first cover plate can separate from the crossbeam and seal the first opening, thereby making the first cover plate fit against the edge of the first opening on the first wall panel, preventing one end of the first cover plate from lifting due to processing and assembly errors, which would result in an uneven appearance and poor aesthetics of the projection screen.

[0020] Furthermore, the projection screen provided by this invention can achieve the sealing of the first opening by the first cover plate without the need for a motor and transmission structure, and does not require motion coupling control with the rolling mechanism and the lifting mechanism. Therefore, it is simple to design, process and assemble, low in cost and high in reliability.

[0021] The beneficial technical effects of the projection display device provided by the present invention are the same as those of the projection screen provided in the embodiments of the present invention, and will not be repeated here. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a laser projection display device in the prior art;

[0024] Figure 2 This is a three-dimensional schematic diagram of a projection display device according to some embodiments of the present invention;

[0025] Figure 3 This is a schematic diagram of a projection host according to some embodiments of the present invention;

[0026] Figure 4 This is a three-dimensional schematic diagram from another perspective of a projection display device according to some embodiments of the present invention;

[0027] Figure 5 This is a partial structural diagram of a projection screen according to some embodiments of the present invention;

[0028] Figure 6 This is a partial structural schematic diagram of a projection screen according to some other embodiments of the present invention (the second cover is in contact with the crossbeam);

[0029] Figure 7 This is a partial structural schematic diagram of a projection screen according to some other embodiments of the present invention (the second cover is separated from the crossbeam);

[0030] Figure 8 This is a three-dimensional schematic diagram of a portion of the structure of a projection screen according to some embodiments of the present invention (with the first cover plate sealing the first opening).

[0031] Figure 9 This is a three-dimensional schematic diagram of a portion of the structure of a projection screen according to some other embodiments of the present invention (the first cover plate is in contact with the crossbeam);

[0032] Figure 10 This is an exploded view of a partial structure of an elastic mechanism according to some embodiments of the present invention;

[0033] Figure 11 This is a partial structural appearance diagram of a projection screen according to some embodiments of the present invention;

[0034] Figure 12 for Figure 6 Sectional view at point AA.

[0035] Reference numerals: 100-Projection screen; 1-First storage section; 101-First receiving cavity; 102-First wall panel; 1021-First opening; 1022-Second guide hole; 1023-Wall panel body; 1024-Support plate; 103-Second left side panel; 104-Second right side panel; 105-Rear side panel; 106-Second bottom plate; 2-Screen; 201-First side; 202-Second side; 3-Rolling mechanism; 301-Roller; 4-Lifting mechanism; 40 1-Lifting assembly; 4011-Drive assembly; 40111-Second motor; 40112-Lead screw; 40113-Nut seat; 4012-Lifting frame; 40121-First drive rod; 40122-Second drive rod; 40123-First support rod; 40124-Second support rod; 402-Crossbeam; 4021-First surface; 4022-Mounting slot; 40221-Second opening; 40222-Positioning hole; 4023-Second surface; Third opening 40231-First guide hole; 4024-Third surface; 4025-Fourth surface; 4026-Fourth surface; 5-First cover plate; 501-Top plate; 502-First side plate; 503-Second side plate; 6-Elastic mechanism; 601-Spring; 602-Fixing component; 6021-Positioning groove; 6022-Semi-circular ring; 6023-Connecting beam; 603-Positioning pin; 7-First guide post; 8-Second guide post; 9-End plate; 901-First circumferential side; 902-Second circumferential side; 903 - Third side; 904 - Fourth side; 905 - Fifth side; 906 - Flat panel; 907 - Connecting part; 200 - Second storage part; 210 - Second receiving cavity; 220 - Light outlet; 230 - Top cover; 240 - First left side plate; 250 - First right side plate; 260 - First base plate; 300 - Projector host; 310 - Light source; 320 - Optical engine; 330 - Lens; 340 - Circuit board; 400 - Projection display device. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection", and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0041] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0042] Laser projection display technology is an optical display technology that uses a semiconductor laser to convert electrical energy into light energy, and then projects the laser onto a screen using an optical path system, a circuit system, and a lens system. It typically requires a projector host 200 to work with a projection screen 100, such as... Figure 1As shown, the projector 200 can emit a laser beam to the projection screen 100, and the screen of the projection screen 100 reflects the beam to display the image.

[0043] See Figure 2 Some embodiments of the present invention provide a projection display device 400, including a projection screen 100, a second storage unit 200, and a projection host 300.

[0044] In order to achieve the emission of a laser beam and display the image on the projection screen 100, such as Figure 3 As shown, the projector 300 may include a light source 310, an optical engine 320, and a lens 330 connected in sequence along the beam transmission direction. When the projector 300 is working, the light source 310 can provide a laser beam to the optical engine 320. The optical engine 320 can modulate the laser beam provided by the light source 310 and project the modulated laser beam onto the lens 330, so that the laser beam is emitted from the lens 330 onto the screen of the projection screen 100 and reflected on the screen of the projection screen 100 so that the user can view the image.

[0045] For example, the light source 310 described above can be a tri-color light source, comprising a red laser component, a blue laser component, a green laser component, and multiple optical lenses. These optical lenses can homogenize and converge the laser beam. Alternatively, the light source 310 can also be a non-tri-color laser light source, i.e., it can be a monochromatic or dichromatic light source. A monochromatic light source can use a blue laser component to excite phosphors to generate two other primary colors of light (such as red and green fluorescence), or generate more than two colors of fluorescence. A dichromatic light source can use a blue laser component and a red laser component, with the blue laser component exciting phosphors to generate green fluorescence (or other colors of fluorescence).

[0046] For example, the aforementioned optomechanical system 320 may include multiple lens groups, such as a total internal reflection (TIR) ​​prism and a reverse total internal reflection (RTIR) mirror, to form an illumination optical path so that the illumination beam can be incident on the core device in the optomechanical system 320, namely the optical valve. The optical valve is used to modulate the beam and cause the modulated beam to be incident on the lens group of the lens 330 for imaging. Furthermore, for example, the optical valve may be a digital micromirror device (DMD).

[0047] For example, the lens 330 described above can be an ultra-short-throw projection lens. An ultra-short-throw projection lens typically includes a refractive mirror group and a reflective mirror group, used to receive the light beam emitted after modulation by the optical engine 320 for imaging. The ultra-short-throw projection lens corrects and amplifies the imaging beam, and after reflection, it is incident on the screen of the projection screen 100 for imaging. Ultra-short-throw projection devices can achieve a smaller throw ratio (the throw ratio is the ratio of the vertical distance from the center point of the light-emitting surface of the lens 330 to the plane where the screen of the projection screen 100 is located to the width of the display area on the screen of the projection screen 100, where the width of the display area refers to the size of the display area along the horizontal direction), such as less than or equal to 0.3. Therefore, when the projector 300 projects an image, it can be closer to the screen of the projection screen 100 to reduce the overall space occupied by the projection display device 400.

[0048] For example, in order to realize laser projection display, the projector 300 may also include multiple circuit boards 340. The multiple circuit boards 340 may be centrally arranged within the projector 300.

[0049] In order to house the projector 300 and make the overall structure of the projection display device 400 more compact, the second storage part 200 is connected to the first storage part 1 of the projection screen 100. The second storage part 200 has a second receiving cavity 210, in which the projector 300 is disposed.

[0050] For example, such as Figure 2 As shown, the second storage section 200 can be rectangular in shape as a whole, and the second storage section 200 can be composed of a top cover plate 230, a first left side plate 240, and a first right side plate 250 (e.g., Figure 4 As shown), the front side panel (not shown in the figure) and the first base plate 260 are connected to form a structure. Another example is, as... Figure 4 As shown, the first storage section 1 can also be rectangular in shape. The first storage section 1 can be constructed by connecting a first wall panel 102, a second left side panel 103, a second right side panel 104, a rear side panel 105, and a second bottom panel 106. Based on this, another example is... Figure 2 As shown, the second receiving cavity 210 of the second storage section 200 and the first receiving cavity 101 of the first storage section 1 can be connected, that is, the second storage section 200 does not have a rear side plate, and the first storage section does not have a front side plate. The upper cover plate 230 of the second storage section 200 can be connected to the first wall plate 102 of the first storage section 1 (e.g., through a threaded connector) and are coplanar. The first left side plate 240 and the second left side plate 103 can be connected (e.g., through a threaded connector) and are coplanar. The first right side plate 250 and the second right side plate 104 can be connected (e.g., through a threaded connector) and are coplanar. Figure 4As shown), the first base plate 260 and the second base plate 106 can be connected (e.g., via threaded connectors) and are coplanar; or, the second storage part 200 and the first storage part 1 can share a left side plate, i.e., the first left side plate 240 and the second left side plate 103 can be two parts of the same side plate; the second storage part 200 and the first storage part 1 can also share a right side plate, i.e., the first right side plate 250 and the second right side plate 104 can be two parts of the same side plate; the second storage part 200 and the first storage part 1 can also share a base plate, i.e., the first base plate 260 and the second base plate 106 can be two parts of the same base plate. All of these are applicable. Based on this, and by another example, the projector host 300 can be directly mounted on the first base plate 260; or, as shown... Figure 2 As shown, the projector 300 can also be installed in the second receiving cavity 210 through the mounting chamber supported on the first base plate 206, and both methods are applicable.

[0051] In order for the beam emitted by the projector 300 to be projected onto the screen of the projection screen 100, such as Figure 2 As shown, the second storage section 200 has a light-emitting port 220 for transmitting light beams emitted from the projector 300. When the projection screen 100 is unfolded, it receives the light beams from the projector 300 to display an image. For example, the light-emitting port 220 can be located on the upper cover plate 230 of the second storage section 200. When a mounting chamber is supported within the second receiving cavity 210, the light-emitting port 220 can also be located on the upper cover plate of the mounting chamber; both applications are possible.

[0052] In existing technology, a commonly used projection screen 100 is a lift-up screen. When the projection display device 400 is working, the screen can be raised and unfolded to receive the light beam from the projector 300 for image display. When the projection display device 400 stops working, the screen can be rolled up and stored in the storage section to reduce the space occupied. Therefore, the storage section for storing the screen has an opening for the screen to pass through, and the opening is usually designed with a cover plate structure. In related technologies, the cover plate structure is driven by a motor-driven linkage mechanism to flip the cover plate to open or close the opening. The structure is relatively complex, and due to processing and assembly errors, one end of the cover plate will be raised when closing the opening, resulting in an uneven appearance of the projection screen 100 and poor aesthetics.

[0053] Based on this, see Figure 2 Some embodiments of the present invention provide a projection screen 100, including the aforementioned first storage part 1, screen 2, rolling mechanism 3, and lifting mechanism 4 (e.g., Figure 4 As shown), the first cover plate 5 and at least one elastic mechanism 6 (such as... Figure 5 (As shown).

[0054] The first storage section 1 has the aforementioned first receiving cavity 101. The first storage section 1 includes the aforementioned first wall panel 102, and the first wall panel 102 has a first opening 1021 communicating with the first receiving cavity 101. The possible specific structure of the first storage section 1 is as described above, and will not be repeated here. For example, the first wall panel 102 can be approximated as a flat plate.

[0055] The screen 2 has opposing first sides 201 and second sides 202. For example, the screen 2 as a whole can be rectangular.

[0056] Based on this, in order to retract the curtain 2, a rolling mechanism 3 is disposed within the first receiving cavity 101 and connected to the first side 201. For example, the rolling mechanism 3 may include a roller 301 and a first motor (not shown in the figure). The roller 301 can be connected to the second base plate 106 of the first storage part 1 via a support and extends in the left-right direction. The first motor can be mounted on the second base plate 106, and the output shaft of the first motor can be connected to the roller 301 for transmission, thereby driving the roller 301 to rotate and causing the curtain 2 to be rolled onto the roller 301. Based on this, and further for example, the first side 201 of the curtain 2 can be fixedly connected to the outer peripheral surface of the roller 301, and the first side 201 extends along the axial direction of the roller 301.

[0057] Based on this, in order to raise and unfold the curtain 2 or lower and retract it, such as Figure 4 As shown, the lifting mechanism 4 includes a lifting assembly 401 and a crossbeam 402. At least a portion of the lifting assembly 401 is disposed in the first receiving cavity 101 and is throttle-connected to the crossbeam 402. The crossbeam 402 is connected to the second side 202. The lifting mechanism 4 and the rolling mechanism 3 cooperate to allow the curtain 2 to be retracted into the first receiving cavity 101 and rolled up on the rolling mechanism 3, or to pass through the first opening 1021 and unfold.

[0058] For example, the lifting assembly 401 may include a drive assembly 4011 and two lifting frames 4012. The drive assembly 4011 is disposed in the first receiving cavity 101. The drive assembly 4011 may include a second motor 40111, two coaxially arranged lead screws 40112, and two nut seats 40113. The second motor 40111 may be a dual-output shaft motor. The two output shafts of the second motor 40111 are respectively connected to the two lead screws 40112 for transmission. The second motor 40111 can be mounted on the second base plate 106 through a support seat. The two lead screws 40112 can be mounted on the second base plate 106 through a support seat. The two nut seats 40113 are respectively sleeved on one lead screw 40112 and threadedly connected to it.

[0059] Based on this, each lifting frame 4012 may include a first drive rod 40121, a second drive rod 40122, a first support rod 40123, and a second support rod 40124. One end of the first support rod 40123 is hinged to the first base plate 106 via a hinge seat, and the other end is hinged to one end of the second support rod 40124. The end of the second support rod 40124 away from the first support rod 40123 is hinged to the crossbeam 402. One end of the first drive rod 40121 is connected to a nut. The first drive rod 40123 is hinged to the first drive rod 20121 at one end, and the second drive rod 40122 at the other end is hinged to the second support rod 40124 at the other end. The first drive rod 40121 and the first support rod 40123 are of equal length and are hinged together. A portion of the first drive rod 40121, a portion of the first support rod 40123, a portion of the second support rod 40124, and the second drive rod 40122 form a rhomboid hinged four-bar linkage. The two second support rods 40124 of the two lifting frames 4012 are hinged to the left and right ends of the crossbeam 402, respectively. Two nut seats 40113 are located between the hinged positions of the two first support rods 40123 and the first base plate 106.

[0060] In this way, the rotation of the second motor 40111 drives the two lead screws 40112 to rotate, which in turn drives the two nut seats 40113 to move towards or away from each other in the left and right directions. When the two nut seats 40113 move towards each other, the first drive rod 40121 and the second drive rod 40122 drive the first support rod 40123 and the second support rod 40124 to move the crossbeam 402 towards the direction closer to the first storage part 1. At the same time, the rolling mechanism 3 rotates, and the screen 2 descends and is rolled up on the rolling mechanism 3 until the screen 2 is completely retracted into the first receiving cavity 101. When the two nut seats 40114 move away from each other, the first drive rod 40121 and the second drive rod 40122 drive the first support rod 40123 and the second support rod 40124 to move the crossbeam 402 away from the first storage part 1. At the same time, the rolling mechanism 3 rotates to release the screen 2. The screen 2 rises and unfolds through the first opening 1021 to receive the beam of light from the projector host 300 to display the image.

[0061] For example, the crossbeam 402 can be a rectangular beam with a rectangular ring cross-section; or, the crossbeam 402 can also be a square beam with a square ring cross-section, both are applicable. Based on this, for example, the second side 202 of the curtain 2 can be fixedly connected to one surface of the crossbeam 402.

[0062] In order to seal the first opening 1021 when the curtain 2 is retracted into the first receiving cavity 101, the first cover plate 5 is located around the periphery of the crossbeam 402. For example, the first cover plate 5 can be a flat plate located on the side of the crossbeam 402 away from the first receiving cavity 101; or, the first cover plate 5 can also be a channel plate wrapped around the periphery of the crossbeam 402, with at least a portion of the first cover plate 5 located on the side of the crossbeam 402 away from the first receiving cavity 101, both of which can be applied.

[0063] Therefore, in order to improve the aesthetics of the projection screen 100, such as Figure 5 As shown, the elastic mechanism 6 is connected to the first cover plate 5 and the crossbeam 402. The elastic mechanism 6 is used to: when the curtain 2 is unfolded, make at least part of the first cover plate 5 contact the crossbeam 402; and when the curtain 2 is retracted, make the first cover plate 5 disengage from the crossbeam 402 and seal the first opening 1021. For example, the elastic mechanism 6 can be located between the first cover plate 5 and the crossbeam 402, and the elastic mechanism 6 is in a stretched deformation state. Also for example, the number of elastic mechanisms 6 can be one, located at the middle position in the left-right direction of the crossbeam 402; or, the number of elastic mechanisms 6 can be two, distributed along the length direction of the crossbeam 402, respectively located near both ends of the crossbeam 402, both of which are applicable.

[0064] In summary, the projection screen 100 provided by the present invention, by having a first receiving cavity 101 in the first storage part 1, the first storage part 1 including a first wall panel 102 having a first opening 1021, and a rolling mechanism 3 disposed in the first receiving cavity 101 and connected to the first side 201 of the screen 2, allows the screen 2 to be rolled up onto the rolling mechanism 3 when it is folded into the first receiving cavity 101; by disposing at least a portion of the lifting component 401 of the lifting mechanism 4 in the first receiving cavity 101 and being drivenly connected to the crossbeam 402, the crossbeam 402 being connected to the second side 202 of the screen 2. Then, when the curling mechanism 3 rotates to retract the curtain 2, the lifting assembly 401 can drive the crossbeam 402 to move towards the first receiving cavity 101 so that the curtain 2 can be rolled up on the curling mechanism 3. When the curling mechanism 3 rotates to release the curtain 2, the lifting assembly 402 can drive the crossbeam 402 to move away from the first receiving cavity 101 so that the curtain 2 can pass through the first opening 1021 and unfold. By providing the first cover plate 5 around the crossbeam 402, the elastic mechanism 6 is connected to the first cover plate 5 and the crossbeam 402 so that when the curtain 2 is unfolded, the first cover plate 5 can contact the crossbeam 402 (e.g., when the curtain 2 is unfolded). Figure 6 As shown), this makes the first cover plate 5 and the crossbeam 402 appear as one unit. When the curtain 2 is retracted, under the pulling force of the rolling mechanism 3, the first cover plate 5 can separate from the crossbeam 402 and seal the first opening 1021, thus making the first cover plate 5 fit against the edge of the first opening 1021 on the first wall panel 102 (as shown). Figure 8 As shown in the figure, this is to prevent the first cover plate 5 from warping up due to processing and assembly errors, which would cause the projection screen 100 to have an uneven appearance and poor aesthetics.

[0065] Furthermore, the projection screen 100 provided by the present invention can achieve the sealing of the first opening 1021 by the first cover plate 5 without the need for a motor and transmission structure, and does not require motion coupling control with the curling mechanism 3 and the lifting mechanism 4. Therefore, the design, processing and assembly are simple, the cost is low and the reliability is good.

[0066] The beneficial technical effects of the projection display device 400 provided by the present invention are the same as those of the projection screen 100 provided in the embodiments of the present invention, and will not be repeated here.

[0067] As one possible implementation, see Figure 7 In some embodiments, the crossbeam 402 has a first surface 4021, and the first surface 4021 has a mounting groove 4022. The elastic mechanism 6 includes a spring 601. One end of the spring 601 is connected to the first cover plate 5, and the other end is located in the mounting groove 4022 and connected to the groove wall of the mounting groove 4022.

[0068] This design ensures that the spring 601 is always in a state of tension and deformation. When the curtain 2 is unfolded, the elastic restoring force of the spring 601 allows the first cover plate 5 to contact the crossbeam 402 (e.g., Figure 6 (As shown); When the curtain 2 is retracted, under the pulling force of the rolling mechanism 3, the deformation of the spring 601 can be further increased, so that the crossbeam 402 can be completely located within the first receiving cavity 101, thereby allowing both ends of the first cover plate 5 to fit against the edge of the first opening 1021 (as shown); Figure 8 As shown in the figure, this ensures the flatness and aesthetics of the projection screen 100.

[0069] For example, the first surface 4021 can be the surface of the beam 402 away from the first receiving cavity 101.

[0070] For example, the mounting slot 4022 can be a circular slot; or the mounting slot 4022 can also be a square slot, and this application does not limit it in this way.

[0071] For example, a hook or loop may be provided on the surface of the first cover plate 5 opposite to the first surface 4021, and the end of the spring 601 is hooked onto the hook or loop.

[0072] For example, the spring 601 can be connected to the bottom wall of the mounting groove 4022; or the spring 601 can be connected to the side wall of the mounting groove 4022, both of which are acceptable.

[0073] For ease of installation of the elastic mechanism 6, see [link / reference]. Figure 9 In some embodiments, the bottom of the mounting groove 4022 has a second opening 40221. The crossbeam 402 also has a second surface 4023, which is disposed opposite to the first surface 4021; the second surface 4023 has a third opening 40231, which exposes the second opening 40221. The elastic mechanism 6 also includes a fixing member 602, which is mounted at the second opening 40221 and connected to the groove wall of the mounting groove 4022; a spring 601 is connected to the fixing member 602.

[0074] With this design, the second opening 40221 can be exposed through the third opening 40231 on the second surface 4023 of the crossbeam 402, which facilitates the connection of the fastener 602 and the spring 601 from the third opening 40231, and the fastener 602 can be installed at the second opening 40221.

[0075] For example, the second opening 40221 can be circular, and the diameter of the second opening 40221 is the same as the inner diameter of the mounting groove, which facilitates processing.

[0076] For example, the fastener 602 can be connected to the side wall or bottom wall of the mounting groove 4022 by a threaded connector; or the fastener 602 can also be connected to the side wall of the mounting groove 4022 by a limiting structure at the second opening 40221, both of which are applicable.

[0077] For example, the fastener 602 can be a fixing plate; or the fastener 602 can be a fixing ring, both of which can be used.

[0078] For example, a hook can be connected to the fastener 602, and the spring 601 is hooked onto the hook; or, a mounting beam can be connected to the fastener 602, and the spring 601 is hooked onto the mounting beam. Both are applicable.

[0079] As one possible implementation, see Figure 9 In some embodiments, the fastener 602 is annular, and its outer peripheral surface fits against the sidewall of the second opening 40221; the outer peripheral surface of the fastener 602 has a positioning groove 6021 (e.g., Figure 10 (As shown). The sidewall of the second opening 40221 has a positioning hole 40222. The elastic mechanism 6 also includes a positioning pin 603, one end of which engages with the positioning groove 6021 and the other end of which engages with the positioning hole 40222.

[0080] With this design, the outer peripheral surface of the fastener 602 fits against the inner wall of the second opening 40221, thus preventing the fastener 602 from moving radially along the second opening 40221. Furthermore, the two ends of the positioning pin 603 engage with the positioning groove 6021 and the positioning hole 40222 respectively, preventing the fastener 602 from moving axially along the second opening 40221. This design allows the fastener 602 to be fixedly installed at the second opening 40221.

[0081] For example, such as Figure 10 As shown, the fastener 602 may include two opposing semicircular rings 6022 and a connecting beam 6023. The inner ring surface of the first semicircular ring 6022 is provided with a mounting hole. One end of the connecting beam 6023 is fixedly connected to the inner ring surface of the second semicircular ring 6022, and the other end is engaged with the mounting hole of the first semicircular ring 6022. The spring 601 is hooked onto the connecting beam 6023.

[0082] For example, the number of positioning pins 603 can be one; or the number of positioning pins 603 can be multiple, arranged sequentially at intervals along the circumference of the second opening 40221. Correspondingly, the number of positioning holes 40222 can also be multiple, corresponding one-to-one with the positioning pins 603. Both can be applied.

[0083] For example, such as Figure 10 As shown, the positioning groove 6021 can be a continuous annular groove surrounding the fixing member 602; or, the positioning groove 6021 can be a groove corresponding to the positioning pin 603.

[0084] For example, an annular limiting step may be formed at the edge of the end face of the second opening 40221, and the surface of the fastener 602 facing the first cover plate 5 abuts against the step surface of the limiting step.

[0085] For example, the positioning hole 40222 can be a threaded hole that penetrates the side wall of the second opening 40221, and the positioning pin 603 has an external thread that engages with the positioning hole 40222. Alternatively, the positioning hole 40222 can be a smooth hole, and the positioning pin 603 can be either a transition fit or an interference fit with the positioning hole 40222. Both are acceptable.

[0086] To ensure the aesthetic appearance of the projection screen 100 when the screen 2 is unfolded, see [reference needed]. Figure 9In some embodiments, the crossbeam 402 has a first guide hole 4024. The projection screen 100 also includes a first guide post 7, one end of which is connected to the first cover plate 5; at least a portion of the first guide post 7 is located within the first guide hole 4024. This design prevents the first cover plate 5 from tilting towards the periphery of the crossbeam 402 or from being misaligned relative to the crossbeam 402 (i.e., the first cover plate 5 is not parallel to the crossbeam 402), which would result in a poor appearance of the projection screen 100.

[0087] For example, the first guide hole 4024 can be formed on the first surface 4021 of the crossbeam 402. When the crossbeam 402 is a hollow beam, the first guide hole 4024 can connect to the inner cavity of the crossbeam 402.

[0088] For example, such as Figure 5 As shown, the number of the first guide hole 4024 and the first guide post 7 can both be two, and they are set along the length direction of the crossbeam 402, with one-to-one correspondence between them.

[0089] For example, such as Figure 5 As shown, a first guide post 7 can be distributed around an elastic mechanism 6.

[0090] For example, the first guide post 7 can be integrally formed with the first cover plate 5.

[0091] To ensure the aesthetic appearance of the projection screen 100 when screen 2 is retracted, see [reference needed]. Figure 11 In some embodiments, the first wall panel 102 has a second guide hole 1022. The projection screen 100 also includes a second guide post 8, one end of which is connected to the first cover plate 5; the second guide post 8 is used to cooperate with the second guide hole 1022 (e.g., Figure 8 (As shown). With this design, when the screen 2 is retracted into the first receiving cavity 101 and the first cover plate 5 seals the first opening 1021, it can prevent the first cover plate 5 from being misaligned relative to the first opening 1021 under the pulling force of the rolling mechanism 3 (i.e., the extension direction of the first cover plate 5 and the first opening 1021 are not parallel), which would result in poor appearance of the projection screen 100.

[0092] For example, the number of the second guide hole 1022 and the second guide post 8 can both be two, arranged along the length direction of the crossbeam 402, with one corresponding to the other.

[0093] For example, such as Figure 11 As shown, when there are two second guide posts 8, one second guide post 8 can be located at one end of the crossbeam 402.

[0094] For example, the second guide hole 1022 and the roller 301 can be located on both sides of the screen 2. For instance, when the screen 2 is unfolded, the roller 301 can be located on the front side of the screen 2, and the second guide hole 1022 can be located on the rear side of the screen 2.

[0095] To further ensure the aesthetics of the projection screen 100 when the screen 2 is retracted, see [reference needed]. Figure 8 In some embodiments, the sidewall of the first opening 1021 is stepped; the second guide hole 1022 is located on the stepped surface of the sidewall of the first opening 1021. When the first cover plate 5 covers the first opening 1021, the first cover plate 5 abuts against the stepped surface of the sidewall of the first opening 1021, and the surface of the first cover plate 5 away from the first receiving cavity 101 is flush with the surface of the first wall panel 102 away from the first receiving cavity 101. With this design, when the projection display device 400 stops working and the first cover plate 5 covers the first opening 1021, the entire upper surface of the projection screen 100 is in the same plane, resulting in a good aesthetic appearance.

[0096] For example, the step on the sidewall of the first opening 1021 can be formed by providing a groove on the first wall plate 102 and opening a through hole on the bottom wall of the groove; or, as... Figure 8 As shown, the first wall panel 1021 may include a wall panel body 1023 and a support plate 1024. The wall panel body 1023 is flat and has a first sub-opening. The support plate 1024 can be connected to the surface of the wall panel body 1023 facing the first receiving cavity 101 and is arranged around the first sub-opening. The support plate 1024 surrounds a second sub-opening with a size smaller than the first sub-opening. The first sub-opening and the second sub-opening constitute the first opening 1021, so that the sidewall of the first opening 1021 is stepped, and both can be applied.

[0097] To ensure the guiding function of the first guide post 7, see [reference needed]. Figure 9 In some embodiments, the end of the first guide post 7 furthest from the first cover plate 5 is tapered. This design allows the crossbeam 401 to have a slight misalignment with the first cover plate 5 when the first cover plate 5 seals the first opening 1021, so that the first cover plate 5 and the first opening 1021 can fit precisely. When the screen 2 is unfolded, the tapered end of the first guide post 7 makes it easier for the first guide post 7 to be embedded in the first guide hole 4024, ensuring the overall aesthetic appearance of the projection screen 100.

[0098] To ensure the guiding function of the second guide post 8, see [reference needed]. Figure 8In some embodiments, the end of the second guide post 8 furthest from the first cover plate 5 is tapered. This design allows the tapered end of the second guide post 8 to more easily embed itself into the second guide hole 1022 to provide guidance when the crossbeam 402 moves toward the first receiving cavity 101, provided there is a slight misalignment between the axis of the second guide post 8 and the axis of the second guide hole 1022 in the vertical direction.

[0099] In some embodiments, the ends of the first guide post 7 and the second guide post 8 that are away from the first cover plate 5 can both be tapered, with the beneficial effects described above, which will not be repeated here.

[0100] As one possible implementation, see Figure 12 In some embodiments, the crossbeam 402 further includes opposing third surfaces 4025 and fourth surfaces 4026, which are located on the same side of the first surface 4021 and are both in contact with the first surface 4021. The first cover plate 5 includes a top plate 501, a first side plate 502, and a second side plate 503. The top plate 501 is parallel to the first surface 4021 of the crossbeam 402; the spring 601 is connected to the top plate 501. The first side plate 502 is connected to the top plate 501 and is parallel to the third surface 4025. The second side plate 503 is connected to the top plate 501 and is parallel to the fourth surface 4026; the second side plate 503 and the first side plate 502 are located on the same side of the top plate 501, and part of the crossbeam 402 is located within the space enclosed by the second side plate 503, the first side plate 502, and the top plate 501.

[0101] With this design, the first side plate 502 and the second side plate 503 can cover the connection structure between the crossbeam 402 and other components (such as the connection structure between the crossbeam 402 and the screen 2, the connection structure between the crossbeam 402 and the elastic mechanism 6, etc.). In addition, the first side plate 502 and the second side plate 503 can also achieve a limiting function, which can prevent the first cover plate 5 from tilting to the side of the crossbeam 402 or from being misaligned relative to the crossbeam 402 (i.e., the first cover plate 5 is not parallel to the crossbeam 402), which would result in poor appearance of the projection screen 100.

[0102] For example, both the third surface 4025 and the fourth surface 4026 are perpendicular to the first surface 4021 and are in contact with the second surface 4023. Correspondingly, the first side plate 502 and the second side plate 503 are perpendicular to the top plate 501.

[0103] For example, the lengths of the first side plate 502 and the second side plate 503 can be the same along the direction perpendicular to the top plate 501; or the lengths of the first side plate 502 and the second side plate 503 can be different, both of which can be applied.

[0104] To further ensure the aesthetics of the projection screen 100 when the screen 2 is unfolded, see [reference needed]. Figure 5 In some embodiments, the projection screen 100 further includes two end plates 9. The two end plates 9 are respectively disposed at both ends of the crossbeam 402. For example... Figure 12 As shown, the end plate 9 includes a first peripheral side 901, a second peripheral side 902, and a third peripheral side 903 connected in sequence. The first peripheral side 901 is flush with the surface of the first side plate 502 away from the second side plate 503, the third peripheral side 903 is flush with the surface of the second side plate 503 away from the first side plate 502, and the second peripheral side 902 is flush with the first surface 4021. With this design, when the screen 2 is unfolded, the end plate 9 can cover the end of the crossbeam 402 and form a complete appearance with the first cover plate 5, ensuring the aesthetics of the entire projection screen 100.

[0105] For example, in a plane parallel to the cross section of the beam 402, the vertical projection of the beam 402 lies within the vertical projection of the end plate 9.

[0106] For example, the end plate 9 may also include a fourth peripheral side 904. Along a direction perpendicular to the top plate 501, when the lengths of the first side plate 502 and the second side plate 503 are the same, the fourth peripheral side 904 may be connected between the first peripheral side 901 and the third peripheral side 903, and flush with the second surface 4023 of the crossbeam 402; or, as... Figure 12 As shown, along the direction perpendicular to the top plate 501, when the length of the first side plate 502 is greater than the length of the second side plate 503, the end plate 9 may also include a fifth circumferential side plate 905. The first circumferential side plate 901, the second circumferential side plate 902, the third circumferential side plate 903, the fourth circumferential side plate 904 and the fifth circumferential side plate 905 are connected end to end in sequence, and all of them can be used.

[0107] For example, such as Figure 6 As shown, the end plate 9 may include a flat plate portion 906 and a connecting portion 907. The first peripheral side 901, the second peripheral side 902, the third peripheral side 903, the fourth peripheral side 904 and the fifth peripheral side 905 are located on the periphery of the flat plate portion 906. The connecting portion 907 is connected to a main surface of the flat plate portion 906. The outer peripheral surface of the connecting portion 907 is in contact with the inner cavity wall of the crossbeam 402. In this way, the end plate 9 can be directly fastened to the end of the crossbeam 402, which is easy to install.

[0108] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A projection screen, characterized by The projection screen comprises: a first receiving part having a first accommodating cavity; the first receiving part comprises a first wall plate having a first opening communicating with the first accommodating cavity; a curtain having opposite first and second side edges; a curling mechanism arranged in the first accommodating cavity and connected with the first side edge; a lifting mechanism comprising a lifting assembly and a crossbeam, at least a part of the lifting assembly being arranged in the first accommodating cavity and in transmission connection with the crossbeam; the crossbeam is connected with the second side edge; the lifting mechanism and the curling mechanism cooperate to enable the curtain to be rolled up on the curling mechanism or to be unfolded through the first opening; the lifting assembly comprises a driving assembly arranged in the first accommodating cavity and a lifting frame connected between the driving assembly and the crossbeam; a first cover plate located on the periphery of the crossbeam; and at least one elastic mechanism connected with the first cover plate and the crossbeam; the elastic mechanism is used to make the first cover plate contact the crossbeam when the curtain is unfolded and to make the first cover plate separate from the crossbeam and cover the first opening when the curtain is rolled up.

2. The projection screen according to claim 1, wherein the crossbeam has a first surface with a mounting groove; the elastic mechanism comprises a spring, one end of the spring being connected with the first cover plate and the other end being located in the mounting groove and connected with the groove wall of the mounting groove.

3. The projection screen according to claim 2, wherein the bottom of the mounting groove has a second opening; the crossbeam further has a second surface arranged opposite to the first surface; the second surface has a third opening exposing the second opening; the elastic mechanism further comprises a fixing member installed at the second opening and connected with the groove wall of the mounting groove; the spring is connected with the fixing member.

4. The projection screen according to claim 3, wherein the fixing member is annular, the outer circumferential surface of the fixing member being fitted with the side wall of the second opening; the outer circumferential surface of the fixing member has a positioning groove; the side wall of the second opening has a positioning hole; the elastic mechanism further comprises a positioning pin, one end of the positioning pin being matched with the positioning groove and the other end being matched with the positioning hole.

5. The projection screen according to any one of claims 1-4, wherein the crossbeam has a first guide hole; the projection screen further comprises a first guide column, one end of the first guide column being connected with the first cover plate; at least a part of the first guide column is located in the first guide hole.

6. The projection screen according to claim 5, wherein the first wall plate has a second guide hole; the projection screen further comprises a second guide column, one end of the second guide column being connected with the first cover plate; the second guide column is used to be matched with the second guide hole.

7. The projection screen according to claim 6, wherein ​ The side wall of the first opening is stepped; the second guide hole is located on the stepped surface of the side wall of the first opening; When the first cover plate covers the first opening, the first cover plate abuts against the stepped surface of the side wall of the first opening, and the surface of the first cover plate away from the first accommodating cavity is flush with the surface of the first wall plate away from the first accommodating cavity.

8. The projection screen according to claim 7, wherein, the end of the first guide column away from the first cover plate is tapered; and / or, the end of the second guide column away from the first cover plate is tapered.

9. The projection screen according to any one of claims 2-4, wherein, the cross beam further comprises opposite third and fourth surfaces, the third and fourth surfaces are located on the same side of the first surface and both abut against the first surface; the first cover plate comprises: a top plate parallel to the first surface of the cross beam; the spring is connected to the top plate; a first side plate connected to the top plate and parallel to the third surface; a second side plate connected to the top plate and parallel to the fourth surface; the second side plate and the first side plate are located on the same side of the top plate, and part of the cross beam is located in the space surrounded by the second side plate, the first side plate and the top plate.

10. A projection display device, characterized by comprising: comprises: the projection screen according to any one of claims 1-9; a second receiving part connected to the first receiving part, the second receiving part having a second accommodating cavity; the second receiving part has a light outlet; and a projection host arranged in the second accommodating cavity; wherein the light outlet is used for transmitting the light beam emitted by the projection host; when the projection screen is unfolded, the light beam from the projection host is received to display a picture.

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