Projection equipment

Abstract

The present application discloses a projection device and a projection screen, belonging to the field of projection technology. The projection device includes: an optical engine and a projection screen, the optical engine is used to emit a light beam, and the projection screen includes an optical film, a rollable substrate, and a control mechanism; the optical film is bonded to the rollable substrate; a plurality of reinforcing ribs are provided on the side of the rollable substrate away from the optical film, and the length direction of each reinforcing rib is not parallel to the longitudinal direction of the rollable substrate; the rollable substrate is fixedly connected to the control mechanism, and the control mechanism can tighten or retract the rollable substrate, and the rollable substrate supports the optical film in a flat state when it is unfolded. In the present application, the rollable substrate can support the optical film in a flat state, and the reinforcing ribs can enhance the strength of the rollable substrate, so that the optical film is not prone to wrinkles and deformation. In this way, the flatness of the optical film can be ensured, thereby improving the display effect of the projection screen.

Description

Technical Field

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

[0002] With the continuous advancement of technology, projection equipment is increasingly being used in people's work and daily lives. Currently, projection equipment mainly consists of an optical engine and a projection screen. The projection screen consists of an optical film, a backplane, and a fixed frame. The optical film is bonded to the backplane, and the fixed frame wraps around the optical film and backplane. The optical engine is primarily responsible for emitting a light beam to the optical film, while the optical film receives the light beam emitted by the optical engine to display the image.

[0003] However, the large backplane surface is prone to deformation, such as bulging, during processing. This can lead to uneven surfaces on the optical film bonded to the backplane, thus affecting the display quality of the projection screen. Furthermore, the backplane significantly increases the weight of the projection screen, making it difficult to transport and hang, and it takes up a lot of space. Summary of the Invention

[0004] This application provides a projection device and a projection screen that can solve the problem of optical films in projection screens being prone to wrinkling and deformation. The technical solution is as follows:

[0005] A projection device, comprising:

[0006] an optical engine, the optical engine being used to emit a light beam;

[0007] A projection screen comprising an optical film, a rollable substrate, and a control mechanism;

[0008] The optical film is bonded to the rollable substrate, and is used to reflect the light beam emitted by the optical engine to display an image;

[0009] A plurality of reinforcing ribs are provided on a side of the rollable substrate away from the optical film, wherein the length direction of each reinforcing rib is not parallel to the longitudinal direction of the rollable substrate;

[0010] The rollable substrate is fixedly connected to the control mechanism. The control mechanism can be tightened to unfold the rollable substrate, or rolled to retract the rollable substrate. When the rollable substrate is unfolded, it supports the optical film in a flat state.

[0011] Optionally, the rollable substrate and the plurality of reinforcing ribs are formed integrally.

[0012] Optionally, the plurality of reinforcing ribs are adhered to the rollable substrate, or the plurality of reinforcing ribs are fixed to the rollable substrate by screws.

[0013] Optionally, the plurality of reinforcing ribs are connected by at least two flexible hinges.

[0014] Optionally, each flexible hinge passes through the plurality of reinforcing ribs in a direction perpendicular to the thickness of the reinforcing ribs, and the at least two flexible hinges are parallel to or cross each other.

[0015] Optionally, each reinforcement rib is parallel to each other along the length direction and parallel to the transverse direction of the rollable substrate.

[0016] Optionally, the length of each reinforcing rib is equal to the length of a side of the rollable substrate along the transverse direction.

[0017] Optionally, a protective coating is provided on a side of the rollable substrate away from the optical film.

[0018] Optionally, the rollable substrate has a hardness between 60 and 70 Rockwell hardness.

[0019] Optionally, the projection screen further comprises a flexible carrier;

[0020] The side of the rollable substrate away from the optical film is adhered to the flexible carrier, and the opposite first side and second side of the flexible carrier are fixedly connected to the control mechanism. The control mechanism can be tightened based on the first side and second side of the flexible carrier to unfold the flexible carrier, or curled to retract the flexible carrier. When the flexible carrier is unfolded, it supports the rollable substrate in a flat state.

[0021] Optionally, the control mechanism includes a curling assembly, a lifting assembly and a fixed support;

[0022] The curling assembly is fixed on the fixed support, the first side of the rollable substrate is fixedly connected to the curling assembly, and the curling assembly can control the optical film and the rollable substrate to curl on the curling assembly;

[0023] The first end of the lifting assembly is fixedly connected to the fixed support, and the second end of the lifting assembly is fixedly connected to the second side of the rollable substrate corresponding to the first side, and the lifting assembly is capable of controlling the rollable substrate to unfold;

[0024] Optionally, the projection device includes a base, the base is used to accommodate the optical engine and the projection screen, and when the projection screen is in an unfolded state, the optical engine and the projection screen have a fixed preset distance.

[0025] The beneficial effects of the technical solution provided by this application may include at least:

[0026] The rollable substrate is equipped with multiple reinforcing ribs on the side facing away from the optical film. The length of each rib is non-parallel to the longitudinal direction of the rollable substrate. These ribs enhance the strength of the rollable substrate while facilitating its curling. When the rollable substrate is flat, they also ensure uniform lateral force, making it less susceptible to ripples and wrinkles. Because the optical film is bonded to the rollable substrate, it is less susceptible to wrinkling and deformation, thereby improving the display quality of the projection screen. Because the control mechanism can be rolled up to retract the rollable substrate, the space occupied by the projection screen can be further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 This is a schematic structural diagram of a projection device provided in an embodiment of the present application;

[0029] Figure 2 This is a schematic diagram of the front structure of a projection screen provided in an embodiment of the present application;

[0030] Figure 3 This is a schematic diagram of the rear view structure of a projection screen provided in an embodiment of the present application;

[0031] Figure 4 1 is a schematic structural diagram of a rollable substrate provided in an embodiment of the present application;

[0032] Figure 5 This is a front structural diagram of another projection screen provided in an embodiment of the present application;

[0033] Figure 6 It is a structural schematic diagram of another projection device provided in an embodiment of the present application.

[0034] Reference numerals:

[0035] 1: Optical engine; 2: Projection screen; 3: Base

[0036] 21: Optical film; 22: Rollable substrate; 23: Flexible carrier; 24: Control mechanism; 25: Reinforcement rib;

[0037] 241: Curling assembly; 242: Lifting assembly; 243: Fixed support. DETAILED DESCRIPTION

[0038] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0039] Figure 1 A schematic diagram illustrating the structure of a projection device according to an embodiment of the present application is shown. Figure 2 A schematic diagram illustrating the front structure of a projection screen according to an embodiment of the present application is shown. Figure 3 The following is a schematic diagram illustrating the rear view structure of a projection screen according to an embodiment of the present application. Figure 4 The structural diagram of a rollable substrate provided by the embodiment of the application is illustrated. Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the projection device includes: an optical engine 1 and a projection screen 2, the optical engine 1 is used to emit a light beam; the projection screen 2 includes an optical film 21, a rollable substrate 22 and a control mechanism 24; the optical film 21 is bonded to the rollable substrate 22, and the optical film 21 is used to reflect the light beam emitted by the optical engine 1 to display a picture; a plurality of reinforcing ribs 25 are provided on the side of the rollable substrate 22 away from the optical film 21, and the length direction of each reinforcing rib 25 is not parallel to the longitudinal direction of the rollable substrate 22; the rollable substrate 22 is fixedly connected to the control mechanism 24, and the control mechanism 24 can be tightened to unfold the rollable substrate 22, or curled to retract the rollable substrate 22, and the rollable substrate 22 supports the optical film 21 in a flat state when it is unfolded.

[0040] In the embodiment of the present application, a plurality of reinforcing ribs 25 are provided on the side of the rollable substrate 22 away from the optical film 21, and the length direction of each reinforcing rib 25 is not parallel to the longitudinal direction of the rollable substrate 22. Therefore, the plurality of reinforcing ribs 25 can enhance the strength of the rollable substrate 22, while facilitating the curling of the rollable substrate 22. When the rollable substrate 22 is in a flat state, the rollable substrate 22 is subjected to uniform force in the lateral direction, making it less prone to ripples and wrinkles. Because the optical film 21 is bonded to the rollable substrate 22, the optical film 21 is less prone to wrinkles and deformation, thereby improving the display effect of the projection screen 2. Because the control mechanism 24 can be curled to retract the rollable substrate 22, the space occupied by the projection screen 2 can be further reduced.

[0041] The optical engine 1 may be an ultra-short-focus optical engine. Of course, the optical engine 1 may also be a short-focus optical engine or a long-focus optical engine.

[0042] The optical engine 1 may include a light source, an optical mechanical system, a lens, a DMD (Digital Micromirror Device) chip, a control circuit board, an audio processing system, speakers, a heat dissipation system, and a radiator. The light source and the lens are fixedly connected to the optical mechanical system. The DMD chip is arranged in the optical mechanical system. The DMD chip, the audio processing system, and the heat dissipation system are electrically connected to the control circuit board respectively. The audio processing system is also electrically connected to the speakers, and the heat dissipation system is also electrically connected to the radiator.

[0043] In this way, the light beam emitted by the light source reaches the DMD chip within the optical machine system. The control circuit board controls the DMD chip to modulate the light beam emitted to the DMD chip. The modulated light beam carries the image information output by the control circuit board and is emitted to the lens. The light beam is then emitted through the lens to the optical film 21 included in the projection screen 2 for display. In addition, the control circuit board controls the audio processing system to process the audio information output by the control circuit board and plays the processed audio information outward through the speakers. When displaying image information and playing audio information outward, the control circuit board can control the heat dissipation system to drive the radiator to dissipate heat to prevent high temperatures from affecting the functions of various components.

[0044] Among them, the longitudinal direction of the rollable substrate 22 is the direction parallel to the vertical direction on the rollable substrate 22, and the transverse direction of the rollable substrate 22 is the direction parallel to the horizontal direction on the rollable substrate 22. The optical film 21 can be a thin film, a Fresnel optical film, a black screen, a white plastic screen, etc. When the optical film 21 is a thin film, the material of the optical film 21 can be PET (Polyethylene Terephthalate). PET has strong corrosion resistance, high tensile strength and tear strength, excellent high temperature resistance, friction resistance and dimensional stability, and thus can ensure a long service life of the optical film 21. Of course, the material of the optical film 21 can also be other materials. For example, when the optical film 21 is a Fresnel optical film, its material can be a synthetic resin, which is not limited in the embodiments of the present application.

[0045] The rollable substrate 22 can be configured as a thin plate to facilitate rolling and reduce the thickness of the projection screen 2, making the projection screen 2 more aesthetically pleasing. The rollable substrate 22 can be made of metal, PP (polypropylene), PC (polycarbonate), PI (polyimide), or other materials, and is not limited in this embodiment.

[0046] The hardness of the rollable substrate 22 can be set to a hardness that is easy to roll. For example, the hardness of the rollable substrate 22 can be between 60-70 Rockwell hardness, which can facilitate the rollable substrate 22 to be rolled and tightened at any time, so as to drive the rollability and tightening of the optical film 21.

[0047] It should be noted that the rollable substrate 22 can be manufactured by die rolling, extrusion, etc. Of course, it can also be manufactured by other methods, which is not limited in the embodiment of the present application.

[0048] It should also be noted that the surface of the rollable substrate 22 on the side close to the optical film 21 can be flat to ensure the flatness of the optical film 21 bonded to the rollable substrate 22. The surface of the rollable substrate 22 on the side away from the optical film 21 can be flat or uneven depending on the actual situation, which is not limited in this embodiment of the application.

[0049] The optical film 21 and the rollable substrate 22 may be bonded together by double-sided tape or adhesive film, or by other methods, which is not limited in the present embodiment.

[0050] It should be noted that the side length of the optical film 21 can be equal to the corresponding side length on the rollable substrate 22. Of course, the side length of the optical film 21 can also be smaller than the corresponding side length on the rollable substrate 22, as long as it can be ensured that the optical film 21 can be completely attached to the rollable substrate 22. The embodiment of the present application does not limit this.

[0051] Each reinforcing rib 25 can be a strip-shaped structure, or other shapes, which are not limited in this embodiment of the present application. The material of the reinforcing rib 25 can be metal, PP (Polypropylene), PC (Polycarbonate), PI (Polyimide), etc., or other materials, which are not limited in this embodiment of the present application. The reinforcing rib 25 can be a long strip-shaped reinforcing rib 25 with a rectangular or trapezoidal cross-section, or other shapes, which are not limited in this embodiment of the present application.

[0052] It should be noted that the material of the reinforcing ribs 25 can be the same as or different from the material of the rollable substrate 22. For example, when the material of the reinforcing ribs 25 is the same as the material of the rollable substrate 22, both the reinforcing ribs 25 and the rollable substrate 22 can be made of polypropylene (PP). When the material of the reinforcing ribs 25 is different from the material of the rollable substrate 22, the rollable substrate 22 can be made of PP, and the material of the multiple reinforcing ribs 25 can all be metal. A rollable substrate 22 made of PP is easier to bend than a rollable substrate 22 made of metal, and metal reinforcing ribs 25 are stronger than PP reinforcing ribs 25. Thus, a rollable substrate 22 provided with reinforcing ribs 25 is not only easier to bend but also stronger.

[0053] It should also be noted that parameters such as the thickness and width of each reinforcing rib 25, as well as the spacing between adjacent reinforcing ribs 25, can be set based on parameters such as the curling diameter and curling tightening force of the rollable substrate 22. When the curling diameter and curling tightening force of the rollable substrate 22 are large, the thickness and width of each reinforcing rib 25, as well as the spacing between adjacent reinforcing ribs 25, can be appropriately increased, although this embodiment of the present application is not limited thereto.

[0054] In some embodiments, as Figure 4 As shown, each rib 25 is parallel to each other along its length and parallel to the transverse direction of the rollable substrate 22. Thus, when the rollable substrate 22 is flat, the parallel ribs 25 ensure more uniform force distribution across all locations on the rollable substrate 22 in both the transverse and longitudinal directions, reducing the likelihood of V-shaped ripples and wrinkles caused by uneven force distribution, thereby enhancing the flatness and stability of the rollable substrate 22. Furthermore, each rib 25 is parallel to the transverse direction of the rollable substrate 22 along its length, further enhancing the uniform force distribution along the transverse direction of the rollable substrate 22. The ribs 25 can further improve the flatness and stability of the rollable substrate 22.

[0055] In some embodiments, the plurality of reinforcing ribs 25 may be bonded to the rollable substrate 22 or may be fixed to the rollable substrate 22 by screws. Of course, the plurality of reinforcing ribs 25 may also be fixed to the rollable substrate 22 by riveting, ultrasonic welding, hot melt, etc., which is not limited in this embodiment of the present application.

[0056] In other embodiments, the rollable substrate 22 can be integrally formed with the plurality of reinforcing ribs 25. Specifically, the rollable substrate 22 and the plurality of reinforcing ribs 25 can be integrally formed by die rolling, extrusion, or other methods. Of course, the rollable substrate 22 with the plurality of reinforcing ribs 25 can also be manufactured by cutting or other methods, and this embodiment of the present application is not limited thereto.

[0057] In some embodiments, the plurality of reinforcing ribs 25 may be connected by at least two flexible hinges. The flexible hinges may be chain-like structures formed by hingedly connecting multiple short sections. This provides high mechanical strength, ease of bending, and high flexibility, making it difficult for the reinforcing ribs 25 connected to the flexible hinges to fall off.

[0058] In some embodiments, each flexible hinge can extend through the plurality of reinforcing ribs 25 in a direction perpendicular to the thickness of the ribs 25, and at least two flexible hinges can be parallel to or cross each other. In this way, the flexible hinges can more effectively secure the plurality of reinforcing ribs 25 and make the force applied to the plurality of reinforcing ribs 25 more uniform.

[0059] It should be noted that when multiple reinforcing ribs 25 are connected by at least two flexible hinges, the spacing between adjacent reinforcing ribs 25 can be reduced based on the actual curling conditions. For example, the spacing between adjacent reinforcing ribs 25 can be set to 2 mm or 3 mm. In this way, the multiple reinforcing ribs 25 and the at least two flexible hinges can be combined to form a rollable curtain-like reinforcing plate. The spacing between adjacent reinforcing ribs 25 is small, resulting in a relatively flat surface. Consequently, the rollable substrate 22 can be removed, and the optical film 21 can be directly bonded to the curtain-like reinforcing plate, thereby reducing the thickness of the projection screen 2. In other words, the projection screen 2 can include only the optical film 21, the curtain-like reinforcing plate composed of multiple reinforcing ribs 25 and at least two flexible hinges, and the control mechanism 24.

[0060] It should also be noted that rounded corners may be provided at all side edges of the reinforcing ribs 25 to accommodate changes in the angle between two adjacent reinforcing ribs 25 , thereby enhancing the flexibility of the curtain-like reinforcing plate when curling.

[0061] In some embodiments, as Figure 4 As shown, the length of each reinforcing rib 25 is equal to the length of the side along the transverse direction of the rollable substrate 22. In this way, each reinforcing rib 25 can more fully reinforce the rollable substrate 22.

[0062] Of course, the length of each reinforcing rib 25 can also be slightly adjusted according to actual conditions, and this embodiment of the present application does not limit this. For example, multiple reinforcing ribs 25 can also be arranged into a square matrix of reinforcing ribs 25 with multiple rows and columns, and the length direction of each reinforcing rib 25 can be parallel to the transverse direction of the rollable substrate 22. In this way, the sum of the lengths of multiple reinforcing ribs 25 located on the same straight line along the transverse direction of the rollable substrate 22 can be equal to the length of the side of the rollable substrate 22 along the transverse direction, and of course can be slightly less than the length of the side of the rollable substrate 22 along the transverse direction, and this embodiment of the present application does not limit this.

[0063] In some embodiments, a protective coating may be provided on the side of the rollable substrate 22 away from the optical film 21. In this way, the protective coating can prevent the side of the rollable substrate 22 away from the optical film 21 from direct contact with the optical film 21 when the rollable substrate 22 is in a rolled state, thereby preventing the surface of the rollable substrate 22 from scratching the optical film 21 due to reasons such as roughness, thereby extending the service life of the optical film 21. The protective coating may be a coating composed of flexible particles or a colloidal coating, which is not limited in the embodiments of the present application. The protective coating may be made of nanomaterials, which have good toughness, impact resistance, and thermal stability. After the protective coating contacts the optical film 21, it may also improve the flatness, wind resistance, and stability of the optical film 21, and may extend the service life of the optical film 21.

[0064] In some embodiments, as Figure 3 As shown, the control mechanism 24 may include a curling component 241, a lifting component 242 and a fixed support 243; the curling component 241 is fixed on the fixed support 243, and the first side of the curling substrate 22 is fixedly connected to the curling component 241, and the curling component 241 can control the optical film 21 and the curling substrate 22 to curl on the curling component 241; the first end of the lifting component 242 is fixedly connected to the fixed support 243, and the second end of the lifting component 242 is fixedly connected to the second side of the curling substrate 22 corresponding to the first side, and the lifting component 242 can control the unfolding of the curling substrate 22.

[0065] The fixing support 243 can be fixedly connected to the installation surface to fix the projection screen 2. The installation surface can be the support surface of the fixing bracket or the wall surface of the wall, etc., as long as the fixed support of the projection screen 2 can be achieved.

[0066] In some embodiments, the winding assembly 241 may include a winding controller, a winding motor, and a reel. The winding controller is electrically connected to the winding motor, which may be fixed to a fixed support 243. The output shaft of the winding motor is fixedly connected to the end of the reel, and the first side of the rollable substrate 22 is fixedly connected to the reel. The winding controller can control the start and stop of the winding motor, and when the winding motor is started, it can drive the reel to rotate. In this way, when the winding controller controls the rotation of the reel, it can control the optical film 21 and the rollable substrate 22 to be rolled on the reel.

[0067] The curling controller can control the curling motor to rotate forward or reverse upon receiving a control signal from a remote controller connected thereto. The curling controller can also be electrically connected to a control button, in which case a control signal can be sent to the curling controller via the control button to control the curling motor to rotate forward or reverse. The curling controller can include a single-chip microcomputer and a signal receiver, the single-chip microcomputer being electrically connected to the signal receiver and the curling motor, respectively. Upon receiving the control signal, the signal receiver transmits the control signal to the single-chip microcomputer, which then controls the curling motor to rotate forward or reverse based on the control signal.

[0068] The winding motor and the end of the reel can be relatively limited in the circumferential direction, so that the reel can rotate synchronously with the winding motor. In addition, the reel can move axially relative to the winding motor, thereby realizing the detachability of the reel.

[0069] When realizing the connection between the winding motor and the reel, in some embodiments, a wedge groove can be provided on the inner wall of the reel along the axial direction, and a wedge block can be provided on the motor shaft of the winding motor. The wedge block can be clamped in the wedge groove along the circumferential direction of the reel, thereby realizing the fixation of the motor shaft of the winding motor and the reel along the circumferential direction, and then the reel and the motor shaft of the winding motor can realize synchronous rotation.

[0070] The cross-section of the wedge groove provided on the inner wall of the drum may be rectangular or trapezoidal, or of course may be other shapes, as long as the torque of the winding motor can be transmitted. This embodiment of the present application does not limit this.

[0071] The number of wedge grooves provided on the inner wall of the reel can be one or more. When there are multiple wedge grooves, the multiple wedge grooves can be distributed along the circumference of the reel. The specific number of wedge grooves is set based on the torque transmitted by the winding motor. As long as the torque of the winding motor can be transmitted to the reel and the reel has a certain service life, this embodiment of the application is not limited to this.

[0072] It should be noted that the winding motor can be a stepper motor, which can facilitate the control of the winding motor by the winding controller. For example, the winding controller can send a control signal to the stepper motor to control the forward and reverse rotation of the stepper motor, thereby driving the reel to rotate forward and reverse.

[0073] Of course, the curling motor can also be other motors, such as a DC reduction motor, etc., as long as it can be easily controlled by the curling controller. The embodiment of the present application does not limit this.

[0074] In other embodiments, the curling motor may include a motor body and a roller, the motor body is electrically connected to the curling controller, the motor shaft of the motor body is fixedly connected to the roller, a groove is provided on the circumferential surface of the roller along the axial direction, and a boss matching the groove is provided on the inner wall of the reel, and the boss can be limited in the groove.

[0075] In this way, the roller fixed on the motor shaft of the motor body is inserted into the inner cavity of the reel so that the groove on the roller cooperates with the boss in the inner cavity of the reel, and the torque on the motor shaft of the motor body is transmitted to the reel through the roller, thereby realizing the synchronous rotation of the reel and the motor shaft of the motor body, and then realizing the synchronous rotation of the reel and the winding motor.

[0076] The cross-section of the boss provided on the inner wall of the drum may be rectangular or trapezoidal, or of course may be other shapes, as long as the torque of the winding motor can be transmitted. This embodiment of the present application does not limit this.

[0077] The number of bosses provided on the inner wall of the drum may be one or more. When there are multiple bosses, the bosses may be arranged along the circumference of the drum. The specific number of bosses is determined based on the torque transmitted by the motor body. As long as the torque of the motor body can be transmitted to the drum and the drum has a certain service life, this embodiment of the application does not impose any limitation on this.

[0078] It should be noted that the motor body can be a stepper motor, which can facilitate the control of the curling motor by the curling controller. Of course, the motor body can also be other motors as long as they can be easily controlled by the curling controller, and this embodiment of the application does not limit this.

[0079] It should also be noted that in addition to the above two embodiments that can achieve synchronous rotation of the motor shaft of the winding motor and the reel, other structures can also be used to achieve synchronous rotation of the motor shaft of the winding motor and the reel, which is not limited in the embodiments of the present application.

[0080] When achieving the fixation of the rollable substrate 22 and the reel, in some embodiments, a card slot may be provided on the outer wall of the reel along the axial direction, and a card strip matching the card slot may be provided on the first side edge of the rollable substrate 22. The card strip can be limited in the card slot along the radial direction of the reel, thereby achieving the limitation of the first side edge of the rollable substrate 22 along the circumferential direction of the reel.

[0081] In this way, when the roll-up drum rotates, the first side of the rollable substrate 22 can be synchronously rolled up with the roll-up drum by limiting the position of the clamping strip, thereby allowing the roll-up drum 22 to be rolled up. In addition, due to the limiting position of the clamping strip, the roll-up drum can apply a certain pulling force to the first side of the rollable substrate 22. This pulling force can cooperate with the action of the second side of the rollable substrate 22 when it is unfolded, making the rollable substrate 22 more flat, thereby improving the display effect of the optical film 21 disposed on the rollable substrate 22.

[0082] Among them, the cross-section of the card slot and the cross-section of the card strip can both be an inverted T-shaped structure. In this way, when the card slot and the card strip are fixedly connected, the card strip can be directly inserted into the card slot along the length direction of the card slot, so as to limit the card strip through the card slot and realize the fixed connection between the card strip and the card slot, so that the first side edge of the rollable substrate 22 can be fixed on the reel conveniently and quickly.

[0083] It should be noted that, in addition to being in an inverted T-shape, the cross-section of the card slot and the cross-section of the card strip can also be square. Of course, they can also be other shapes, as long as the card slot can limit the card strip along the circumferential direction of the reel. The embodiment of the present application does not limit this.

[0084] The depth of the slot can be equal to the height of the clip. In this way, when the roll rolls and the rollable substrate 22 rolls up, the rollable substrate 22 can be tightly attached to the roll roll, thereby avoiding the phenomenon that the rollable substrate 22 is sheared by the edge of the clip or the slot when the height of the clip is greater or less than the depth of the slot.

[0085] It should be noted that, in addition to limiting the first side edge of the rollable substrate 22 along the circumferential direction of the roll by cooperating with the card slot and the card strip, the first side edge of the rollable substrate 22 can also be limited along the circumferential direction of the roll by bonding the outer wall of the roll to the first side edge of the rollable substrate 22. Of course, limiting the first side edge of the rollable substrate 22 along the circumferential direction of the roll can also be achieved by other means, which will not be elaborated in the embodiments of the present application.

[0086] In some embodiments, the lifting assembly 242 may include a lifting controller, a lifting motor, a support frame, and a long rigid frame. The lifting controller is electrically connected to the lifting motor. The lifting motor and the first end of the support frame are respectively fixed to the fixed support 243, and the second end of the support frame is connected to the long rigid frame. The length direction of the long rigid frame can be consistent with the length direction of the second side of the rollable substrate 22, and the length of the long rigid frame can be equal to the length of the second side of the rollable substrate 22. In this way, the long rigid frame can be fixedly connected to the second side of the rollable substrate 22, and the long rigid frame can limit the rollable substrate 22 along the length direction, thereby ensuring the flatness of the rollable substrate 22. The lifting controller can control the start and stop of the lifting motor, and the lifting motor can adjust the distance between the second end of the support frame and the curling assembly 241. Therefore, based on the connection between the long rigid frame and the rollable substrate 22, the support frame can control the optical film 21 and the rollable substrate 22 to unfold and maintain a flat state.

[0087] In this way, after the lifting controller controls the lifting motor to start, the lifting motor can drive the second end of the support frame to rise, thereby driving the second side of the rollable substrate 22 to rise. At this time, the rollable substrate 22 can be unfolded while the rollable substrate 22 is controlled by the rolling assembly 241 to rotate in the opposite direction. In addition, when the lifting motor drives the second end of the support frame to descend, it can drive the second side of the rollable substrate 22 to descend. At this time, the rollable substrate 22 can be retracted while the rollable substrate 22 is controlled by the rolling assembly 241 to rotate in the forward direction.

[0088] The lifting controller can control the lifting motor to rotate forward or reverse when receiving a control signal from a remote controller connected thereto, thereby controlling the lifting frame to ascend or descend. Of course, the lifting controller can also be electrically connected to a control button, in which case a control signal can be sent to the lifting controller via the control button to control the lifting frame to ascend or descend by rotating the lifting motor forward or reverse.

[0089] Among them, the lifting controller may include a single-chip microcomputer and a signal receiver, and the single-chip microcomputer is electrically connected to the signal receiver and the lifting motor respectively. In this way, after the signal receiver receives the control signal, the signal receiver sends the control signal to the single-chip microcomputer, and the single-chip microcomputer controls the forward or reverse rotation of the lifting motor based on the control signal.

[0090] It should be noted that when the structure of the winding assembly 241 is as described above, the lifting controller and the winding controller can be the same controller. Thus, when the projection device is turned on, the same controller receives a start signal from a remote control connected thereto and, based on the start signal, controls the winding motor and the lifting motor to start simultaneously. At this point, the winding motor drives the reel to rotate synchronously in the reverse direction, while the lifting motor drives the second end of the support frame to rise, thereby achieving the simultaneous unfolding of the rollable substrate 22 and the optical film 21. When the projection device is turned off, the same controller receives a shutdown signal from a remote control connected thereto and, based on the shutdown signal, controls the winding motor and the lifting motor to start simultaneously. At this point, the winding motor drives the reel to rotate synchronously in the forward direction, while the lifting motor drives the second end of the support frame to descend, thereby achieving the simultaneous curling of the rollable substrate 22 and the optical film 21.

[0091] It should also be noted that when the rollable substrate 22 and the optical film 21 are jointly unfolded, the height to which the second side of the rollable substrate 22 needs to be raised can be pre-designed, and the operating time of the winding motor and the lifting motor can be pre-controlled based on this height. In other words, when the same controller receives a start signal, it can automatically control the second side of the rollable substrate 22 to rise to the required height within the operating time to achieve full unfolding of the rollable substrate 22 and the optical film 21; or when it receives a shutdown signal, it can automatically control the second side of the rollable substrate 22 to curl on the reel within the operating time to achieve full retraction of the rollable substrate 22 and the optical film 21. Of course, the same controller can also be manually controlled to achieve full unfolding or retraction of the rollable substrate 22 and the optical film 21.

[0092] The support frame may be a foldable support frame or a telescopic support frame, as long as the optical film 21 and the rollable substrate 22 can be controlled to unfold in a flat state. This embodiment of the present application does not limit this.

[0093] In some embodiments, as Figure 5 As shown, the projection screen 2 may further include a flexible carrier 23; a side of the rollable substrate 22 away from the optical film 21 is adhered to the flexible carrier 23, and the first side edge and the second side edge opposite to each other on the flexible carrier 23 are fixedly connected to the control mechanism 24, and the control mechanism 24 can be tightened based on the first side edge and the second side edge of the flexible carrier 23 to unfold the flexible carrier 23, or curled to retract the flexible carrier 23, and when the flexible carrier 23 is unfolded, it supports the rollable substrate 22 in a flat state.

[0094] In this way, while the control mechanism 24 indirectly tightens the rollable substrate 22 through the flexible carrier 23, the flexible carrier 23 can bear part of the tensioning force of the control mechanism 24, making the rollable substrate and the optical film 21 less likely to be damaged, thereby further ensuring the flatness of the optical film 21.

[0095] Among them, the connection relationship between the flexible carrier 23 and the curling component 241 and the lifting component 242 included in the control mechanism 24 is the same or similar to the connection relationship between the curling substrate 22 and the curling component 241 and the lifting component 242 in the above embodiment, and will not be repeated in this embodiment of the present application.

[0096] The flexible carrier 23 can be a synthetic fabric, film, or other carrier that is easily rollable and has sufficient load-bearing strength. When the flexible carrier 23 is a synthetic fabric, the material of the flexible carrier 23 can be a synthetic material containing nylon. Because nylon has high mechanical strength, good toughness, and high tensile and compressive strength, the flexible carrier 23 is not easily deformed when tightened by the control mechanism 24 and has a smooth surface, thereby improving the flatness of the rollable substrate 22 and the optical film 21. Of course, the material of the flexible carrier 23 can also be other materials, and this embodiment of the application is not limited thereto.

[0097] The rollable substrate 22 and the flexible carrier 23 can be bonded together using double-sided tape or adhesive film, but other bonding methods are also possible and are not limited in this embodiment. A side edge of the rollable substrate 22 adjacent to the first side edge of the flexible carrier 23 can be fixedly connected to the control mechanism 24 using screws. Of course, the rollable substrate may not be directly connected to the control mechanism 24, but this is not limited in this embodiment.

[0098] It should be noted that when the control mechanism 24 includes a curling assembly 241, a side edge of the curling substrate 22 adjacent to the first side edge of the flexible carrier 23 can be fixedly connected to the curling assembly 241 via a screw. In this way, the curling substrate 22 can partially absorb the tension exerted on the flexible carrier 23, thereby making the flexible carrier 23 less likely to deform and ensuring the stability of the flexible carrier 23. This can enhance the stability of the curling substrate 22 and prevent it from shaking.

[0099] In some embodiments, as Figure 6As shown, the projection device may include a base 3 for accommodating the optical engine 1 and the projection screen 2. When the projection screen 2 is deployed, the optical engine 1 and the projection screen 2 maintain a fixed, preset distance. Thus, when the projection device is not in use, the optical engine 1 and the projection screen 2 can be stored in the base 3, saving space. When the projection device is in use, the projection screen 2 can be deployed, and the optical engine 1 can project a light beam onto the projection screen 2, causing the projection screen 2 to display an image. Furthermore, the base 3 maintains a fixed, preset distance between the optical engine 1 and the projection screen 2, thereby maintaining a preset throw ratio.

[0100] It should be noted that when the projection screen 2 includes the optical film 21, the rollable substrate 22, and the control mechanism 24, the optical film 21, the rollable substrate 22, and the control mechanism 24 can all be stored within the base 3, and the optical film 21, the rollable substrate 22, and the control mechanism 24 can also be deployed simultaneously. When the projection screen 2 includes other structures, the other structures can also be stored within the base 3 and deployed simultaneously. Furthermore, when the control mechanism 24 includes a lifting assembly 242 and a rolling assembly 241, the lifting assembly 242 and the rolling assembly 241 can also be stored within the base 3, and the lifting assembly 242 can extend from the base 3 and be deployed.

[0101] In some embodiments, the base 3 may include a first accommodating portion and a second accommodating portion. The optical engine 1 is disposed in the inner cavity of the first accommodating portion. The first accommodating portion is provided with a light-transmitting area, and the light beam emitted by the optical engine 1 can pass through the light-transmitting area. The control mechanism 24 may be disposed in the inner cavity of the second accommodating portion. The control mechanism 24 can control the optical film 21 and the rollable substrate 22 to be retracted into the second accommodating portion. The second accommodating portion is provided with an opening. The control mechanism 24 can control the optical film 21 and the rollable substrate 22 to extend out of the opening and unfold. When the control mechanism 24 includes a lifting assembly 242, the lifting assembly 242 can extend out of the opening and unfold. After unfolding, the optical film 21 can receive the light beam that has passed through the light-transmitting area.

[0102] In some embodiments, the base 3 may be in a T-shaped structure, and the volume of the first accommodating portion is smaller than the volume of the second accommodating portion.

[0103] The first accommodating portion and the second accommodating portion may be detachably connected. Of course, the first accommodating portion and the second accommodating portion may also be non-detachably connected, that is, the first accommodating portion and the second accommodating portion may be integrally connected.

[0104] It should be noted that when the first accommodating portion and the second accommodating portion are detachably connected, if the optical engine 1 fails, the first accommodating portion can be removed, and the first accommodating portion provided with the optical engine 1 can be sent for repair as a whole. If the curling assembly 241 included in the projection screen 2 fails, the second accommodating portion can be removed, and the second accommodating portion provided with the curling assembly 241 can be sent for repair as a whole, thereby avoiding sending the entire projection equipment for repair.

[0105] In some embodiments, the first and second accommodating portions may be connected by a telescopic rod that can be extended and retracted along its own axial direction. Specifically, as the telescopic rod is extended and retracted, the vertical distance between the center point of the light-transmitting area on the first accommodating portion and the opening on the second accommodating portion can be adjusted, thereby adjusting the projection distance between the center point of the light beam emitted by optical engine 1 and the plane on which projection screen 2 lies when deployed, thereby adjusting the size of the image displayed on projection screen 2 by the light beam emitted by optical engine 1. Furthermore, because the vertical distance between the center point of the light-transmitting area on the first accommodating portion and the opening on the second accommodating portion is adjustable, the projection device can adapt to optical engines 1 with different throw ratios while ensuring the size of the displayed image.

[0106] In an embodiment of the present application, a rollable substrate is provided with multiple reinforcing ribs on a side away from the optical film. The length of each rib is non-parallel to the longitudinal direction of the rollable substrate. Thus, the multiple ribs enhance the strength of the rollable substrate and facilitate its curling. When the rollable substrate is flat, the lateral force applied to the rollable substrate is uniform, making it less susceptible to ripples and wrinkles. Because the optical film is bonded to the rollable substrate, it is less susceptible to wrinkles and deformation, thereby improving the display quality of the projection screen. Because the control mechanism can be rolled to retract the rollable substrate, the space occupied by the projection screen can be further reduced. When the projection screen includes a flexible carrier, the rollable substrate can be bonded to the flexible carrier, and the control mechanism can tension the flexible carrier based on the first and second side edges of the flexible carrier. Therefore, while the control mechanism indirectly tensions the rollable substrate through the flexible carrier, the flexible carrier can bear a portion of the tensioning force of the control mechanism, thereby preventing damage to the rollable substrate and the optical film. This further ensures the flatness of the optical film, thereby improving the display effect of the projection screen. In addition, the base can store the optical engine and projection screen, thereby reducing the space occupied when the projection device is not in use.

[0107] The above description is merely an illustrative embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A projection device, characterized in that: The projection device comprises: an optical engine, the optical engine being used to emit a light beam; A projection screen comprising an optical film, a rollable substrate, a flexible carrier, and a control mechanism; The optical film is bonded to the rollable substrate, and is used to reflect the light beam emitted by the optical engine to display an image; A plurality of reinforcing ribs are provided on a side of the rollable substrate away from the optical film, wherein the length direction of each reinforcing rib is not parallel to the longitudinal direction of the rollable substrate; the plurality of reinforcing ribs are used to enhance the strength of the rollable substrate; the rollable substrate is made of metal, the plurality of reinforcing ribs are also made of metal, and the rollable substrate and the plurality of reinforcing ribs are formed integrally; The rollable substrate supports the optical film in a flat state when unfolded; The side of the rollable substrate away from the optical film is adhered to the flexible carrier, and the opposite first side and second side of the flexible carrier are fixedly connected to the control mechanism, and the control mechanism can be stretched based on the first side and second side of the flexible carrier to unfold the flexible carrier, or rolled up to retract the flexible carrier. When the flexible carrier is unfolded, it supports the rollable substrate in a flat state, and the control mechanism stretches the rollable substrate or rolls up the rollable substrate through the flexible carrier.

2. The projection device according to claim 1, wherein: The plurality of reinforcing ribs are connected by at least two flexible hinges.

3. The projection device according to claim 2, wherein: Each flexible hinge passes through the plurality of reinforcing ribs in a direction perpendicular to the thickness of the reinforcing ribs, and the at least two flexible hinges are parallel to or cross each other.

4. The projection device according to claim 1, wherein: Each reinforcement rib is parallel to each other along the length direction and parallel to the transverse direction of the rollable substrate.

5. The projection device according to claim 4, wherein: The length of each reinforcing rib is equal to the length of the side of the rollable substrate along the transverse direction.

6. The projection device according to claim 1, wherein: The hardness of the rollable substrate is between 60 and 70 Rockwell hardness.

7. The projection device according to claim 1, wherein: The control mechanism includes a curling assembly, a lifting assembly and a fixed support; The curling assembly is fixed on the fixed support, the first side of the flexible carrier is fixedly connected to the curling assembly, and the curling assembly can control the optical film, the rollable substrate and the flexible carrier to curl on the curling assembly; The first end of the lifting assembly is fixedly connected to the fixed support, and the second end of the lifting assembly is fixedly connected to the second side of the flexible carrier corresponding to the first side. The lifting assembly can control the flexible carrier to unfold.

8. The projection device according to claim 7, wherein: The projection device includes a base, the base is used to accommodate the optical engine and the projection screen, and when the projection screen is in an unfolded state, the optical engine and the projection screen have a fixed preset distance.

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