Projection equipment and projection screen calibration method

Abstract

The present invention relates to a projector correction mechanism, a projector, and a projector correction method. The projector correction mechanism includes: a housing, a slide rail being provided on the housing; a moving assembly being movably provided on the slide rail; a camera component being provided on the moving assembly, the moving assembly being capable of driving the camera component to move on the slide rail so that the camera component is located at different positions relative to the housing; the camera component being configured to capture image information of a projection screen projected by a projection device when the camera component is located at at least two different positions relative to the housing; and a controller being electrically connected to the camera component, and the controller being configured to perform trapezoidal correction on the projection screen projected by the projection device based on the image information captured by the camera component at at least two different positions. The present invention has low cost and high correction accuracy.

Description

Technical Field

[0001] The present invention relates to the field of projection display technology, and in particular to a projection device and a method for correcting a projection image. Background Art

[0002] With the continuous development of multimedia technology, smart projectors are becoming more and more popular. However, because there are many uncertain factors in the projection environment when the projector projects the image, the projected image is often distorted. For example, under normal circumstances, the image projected by the projector is rectangular, but due to factors such as the tilt of the projector position and the projection direction not being completely perpendicular to the projection surface, the projected image becomes a non-rectangular quadrilateral such as a trapezoid, which seriously affects the user's viewing experience. For this reason, the projector in the related art is generally provided with a correction mechanism, which performs trapezoidal correction by setting up multiple camera components to shoot the projected image of the projector. However, the correction mechanism of the projector in the related art has the problem of high cost. Summary of the Invention

[0003] Based on this, a projection device and a method for correcting a projection image with low cost and high correction accuracy are provided.

[0004] A first aspect of an embodiment of the present application provides a projection device, including:

[0005] a housing, wherein a slide rail is provided on the housing;

[0006] A moving assembly is movably arranged on the slide rail;

[0007] A camera component is provided on the moving assembly, and the moving assembly is capable of driving the camera component to move on the slide rail so that the camera component is located at different positions relative to the housing; the camera component is configured to capture image information of a projection screen projected by the projection device when it is located at at least two different positions relative to the housing;

[0008] The controller is electrically connected to the camera component, and is configured to perform trapezoidal correction on the projection image projected by the projection device according to image information captured by the camera component at at least two different positions.

[0009] In one embodiment, the moving assembly includes a moving part and a driving motor arranged on the moving part, a first matching portion is provided on the driving shaft of the driving motor, and the slide rail includes a base and a second matching portion provided on one side of the base. The first matching portion and the second matching portion cooperate to enable the camera component to move along the slide rail when the driving motor rotates.

[0010] In one embodiment, the first matching portion is configured as a gear, and the second matching portion is configured as a rack capable of meshing with the gear.

[0011] In one embodiment, the drive motor is connected to the surface of the moving member facing away from the slide rail, and the drive shaft of the drive motor passes through the connecting member and extends toward the slide rail, and the first matching portion is connected to the partial shaft section of the drive shaft facing the slide rail.

[0012] In one embodiment, a third mating portion is further provided on the moving part, and the slide rail also includes a fourth mating portion provided on the other side of the base. The third mating portion is in rolling contact with the side of the fourth mating portion facing away from the second mating portion, and is configured so that at least part of the structure extends into the gap between the fourth mating portion and the shell to limit the third mating portion from disengaging from the fourth mating portion.

[0013] In one embodiment, the third matching portion is configured as a sliding wheel, and a groove is provided on the wheel surface of the sliding wheel;

[0014] The fourth matching portion is configured as a convex strip extending along the length direction of the base, and the convex strip is embedded in the groove of the third matching portion so that at least part of the structure of the third matching portion extends into the gap between the fourth matching portion and the shell.

[0015] In one embodiment, the end of the moving part corresponding to the third matching part is configured as a bending structure, the bent inner side of the bending structure is wrapped around the outer side of the fourth matching part away from the second matching part, and the third matching part is rotatably supported on the bent inner side wall of the bending part.

[0016] In one embodiment, at least one of the slide rail and the housing is provided with a limit switch electrically connected to the controller;

[0017] There are two limit switches, which are arranged at intervals in the moving direction of the moving component and are used to detect the relative position information of the moving component and the limit switch;

[0018] The controller is also used to control the operation of the drive motor according to the relative position information detected by the limit switch.

[0019] In one embodiment, the housing is further provided with a light-transmitting opening for the camera component to capture the projection image of the projection device. The light-transmitting opening is located on the side of the slide rail, and a light-transmitting lens is installed on the light-transmitting opening.

[0020] A second aspect of an embodiment of the present application provides a method for correcting a projection image, for performing trapezoidal correction on a projection image projected by a projection device, wherein the projection device includes a housing, a slide rail provided on the housing, and a movable assembly and a camera component connected thereto, wherein the movable assembly is movably provided on the slide rail and is capable of driving the camera component to move on the slide rail; the method for correcting the projection image includes:

[0021] Controlling the moving assembly to drive the camera component to move to at least two different positions relative to the housing, and controlling the camera component to capture image information of a projection screen projected by the projection device when the camera component is at the at least two different positions;

[0022] Acquiring image information captured by a camera component at at least two different positions;

[0023] The projection picture projected by the projection device is subjected to trapezoidal correction according to the image information captured by the camera component at at least two different positions.

[0024] Beneficial effects of the above-mentioned projection device and projection image correction method:

[0025] In the above scheme, by setting up a moving component, the moving component can drive the camera component to move on the slide rail so that the camera component is located at different positions relative to the shell, and the camera component is configured to be able to capture image information of the projection screen projected by the projection device when it is located at at least two different positions relative to the shell. In this way, only one camera component can be used to complete the capture of the projection screen at at least two different positions, which reduces the cost of the projection device compared to the scheme in which a camera component is separately equipped at each position.

[0026] In addition, since the controller is configured to perform trapezoidal correction on the projection screen projected by the projection device based on image information captured by the camera component at at least two different positions, the correction accuracy is greatly improved compared to correction based only on image information captured at one position. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the exploded structure of the projection device provided in an embodiment of the present application;

[0028] Figure 2 A cross-sectional view of a projection device provided in an embodiment of the present application;

[0029] Figure 3 This is a schematic structural diagram of the projection device provided in an embodiment of the present application as viewed from the inner side of the housing;

[0030] Figure 4 A front view of the projection device provided in an embodiment of the present application;

[0031] Figure 5 A schematic diagram of a flow chart of a method for correcting a projection image provided in an embodiment of the present application;

[0032] Figure 6 A schematic diagram of the steps of a method for correcting a projection image provided in an embodiment of the present application;

[0033] Figure 7A schematic diagram of the structure of a projection image correction device provided in an embodiment of the present application.

[0034] Description of Figure Numbers:

[0035] 100. Projection equipment;

[0036] 10. Housing; 11. Light-transmitting opening; 12. Light-transmitting lens; 13. Light-emitting notch; 131. Light-transmitting glass;

[0037] 20. Moving assembly; 21. Slide rail; 210. Base; 211. Limit switch; 2111. Detection end; 22. Moving member; 220. Drive motor; 221. First mating portion; 222. Second mating portion; 223. Third mating portion; 2230. Groove; 224. Fourth mating portion; 225. Bending structure; 2212. Sensing portion; 23. Camera component;

[0038] 200, projection image correction device; 201, movement control module; 202, camera component control module; 203, acquisition module; 204, calculation module; 205, trapezoidal correction module. DETAILED DESCRIPTION

[0039] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0041] Furthermore, 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0042] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0043] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0044] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0045] The following describes the projection device and the projection screen correction method according to the embodiments of the present application with reference to the accompanying drawings.

[0046] Figure 1 This is a schematic diagram of the exploded structure of the projection device provided in an embodiment of the present application. Figure 2 A cross-sectional view of a projection device provided in an embodiment of the present application.

[0047] Reference Figure 1 、 Figure 2In a first aspect, an embodiment of the present application provides a projection device 100 , which includes a housing 10 and a slide rail 21 provided on the housing 10 .

[0048] Furthermore, it should be understood that the structures illustrated in the embodiments of the present application do not constitute specific limitations on the projection device 100. In other embodiments of the present application, the projection device 100 may include more or fewer components than illustrated, or may combine or separate certain components, or may have different component arrangements. For example, although not illustrated, the projection device 100 may further include a functional unit such as a projection unit disposed within the housing 10, wherein the projection unit is configured to project an image onto an object such as a projection screen, a wall, or a curtain.

[0049] In an embodiment of the present application, the projection device 100 also includes: a moving component 20, which is movably arranged on the slide rail 21; a camera component 23, which is arranged on the moving component 20, and the moving component 20 can drive the camera component 23 to move on the slide rail 21 so that the camera component 23 is located at different positions relative to the shell 10; the camera component 23 is configured to be able to capture image information of the projection screen projected by the projection device 100 when it is located at at least two different positions relative to the shell 10; and a controller (not shown), which is electrically connected to the camera component 23, and the controller is configured to be able to perform trapezoidal correction on the projection screen projected by the projection device 100 according to the image information captured by the camera component 23 at at least two different positions.

[0050] In the above scheme, by setting up a moving component 20, the moving component 20 can drive the camera component 23 to move on the slide rail 21, so that the camera component 23 is located at different positions relative to the shell 10, and the camera component 23 is configured to be able to capture image information of the projection screen projected by the projection device 100 when it is located at at least two different positions relative to the shell 10. In this way, only one camera component 23 can be used to complete the capture of projection screens at at least two different positions. Compared with the scheme in which a camera component 23 is separately equipped at each position, the cost of the projection device 100 is reduced.

[0051] In addition, since the controller is configured to perform trapezoidal correction on the projection screen projected by the projection device 100 based on image information captured by the camera component 23 at at least two different positions, the correction accuracy is greatly improved compared to correction based only on image information captured at one position.

[0052] In the embodiment of the present application, the number of different positions is two as an example for explanation, that is, the mobile assembly 20 can drive the camera component 23 to move on the slide rail 21 so that the camera component 23 is located at two different positions relative to the housing 10. The camera component 23 is used to capture image information of the projection screen projected by the projection device 100 when it is located at the two different positions relative to the housing 10. Of course, during this process, the slide rail 21 guides the movement of the mobile assembly 20. The number of different positions of the camera component 23 is similar to other cases and will not be repeated here. The camera component 23 can be, for example, an image acquisition element such as a camera.

[0053] Further, continue to refer to Figure 1 The moving component 20 includes a moving part 22 and a driving motor 220 arranged on the moving part 22. A first matching portion 221 is provided on the driving shaft of the driving motor 220. The slide rail 21 includes a base 210 and a second matching portion 222 provided on one side of the base 210. The first matching portion 221 and the second matching portion 222 cooperate to enable the camera component 23 to move along the slide rail 21 when the driving motor 220 rotates.

[0054] As described above, when the drive shaft of the drive motor 220 rotates, it can drive the first engaging portion 221 to rotate. The first engaging portion 221 and the second engaging portion 222 cooperate to achieve movement of the camera component 23 relative to the slide rail 21. Thus, by providing the drive motor 220, the movement posture of the camera component 23 relative to the slide rail 21 can be controlled by controlling the start and stop of the drive motor 220, and the movement direction of the camera component 23 relative to the slide rail 21 can be controlled by controlling the forward and reverse rotation of the drive motor 220.

[0055] Furthermore, the first matching portion 221 is configured as a gear, and the second matching portion 222 is configured as a rack capable of meshing with the gear.

[0056] As described above, the first engaging portion 221 and the second engaging portion 222 are configured as a gear and a rack, respectively. The meshing engagement of the two allows for highly accurate control of the position of the camera component 23. Furthermore, when the camera component 23 moves to a certain position and needs to pause there for filming, this meshing structure also facilitates self-locking of the camera component 23 at different filming positions.

[0057] It can be understood that the setting form of the first matching part 221 and the second matching part 222 is not limited to the above. The first matching part 221 can also be configured as a roller, and the second matching part 222 can be a slide groove opened on the base 210 of the slide rail 21, wherein the slide groove and the roller can cooperate with each other, and the first matching part 221 and the second matching part 222 move relative to each other through the action of friction.

[0058] In the present application, refer to Figure 3 The moving part 22 drives the camera component 23 to move to the two end positions of the slide rail 21 along the moving direction S as the two shooting positions of the camera component 23. The situation where the shooting position of the camera component 23 is other positions is similar to this and will not be repeated here.

[0059] In the embodiment of the present application, the drive motor 220 is connected to the surface of the moving member 22 facing away from the slide rail 21, and the drive shaft of the drive motor 220 passes through the connecting member and extends toward the slide rail 21. The first mating portion 221 is connected to the portion of the drive shaft that faces the slide rail 21. This allows for efficient use of space and a more compact overall structure.

[0060] Furthermore, the movable member 22 is also provided with a third matching portion 223, and the slide rail 21 also includes a fourth matching portion 224 located on the other side of the base 210. The third matching portion 223 is in rolling contact with a side of the fourth matching portion 224 that is away from the second matching portion 222, and is configured to have at least a portion of its structure extend into the gap between the fourth matching portion 224 and the housing 10, so as to limit the third matching portion 223 from disengaging from the fourth matching portion 224. In this way, the slide rail 21 and the movable member 22 are positioned with each other and will not disengage. Specifically, at least a portion of the structure of the third matching portion 223 extends into and is hooked to the gap between the fourth matching portion 224 and the housing 10, and the mutual cooperation of the second matching portion 222 and the first matching portion 221 on one side of the base 210 can prevent the movable member 22 from disengaging from the slide rail 21.

[0061] Exemplarily, the third mating portion 223 is configured as a sliding wheel, and a groove 2230 is provided on the wheel surface of the sliding wheel; the fourth mating portion 224 is configured as a convex strip extending along the length direction of the base 210, and the convex strip is embedded in the groove 2230 of the third mating portion 223, so that at least part of the structure of the third mating portion 223 extends into the gap between the fourth mating portion 224 and the shell 10.

[0062] Specifically, the third mating portion 223 can be a V-groove bearing, and the groove 2230 is a V-groove. The fourth mating portion 224 of the slide rail 21 presses into the V-groove of the third mating portion 223. As described above, when the movable member 22 tends to separate from the slide rail 21 due to external forces, the groove wall of the V-groove of the V-groove bearing abuts against the fourth mating portion 224 of the slide rail 21, thereby preventing the movable member 20 and the slide rail 21 from separating from each other.

[0063] In an embodiment of the present application, the installation method of the third matching part 223 can be that the end of the movable part 22 corresponding to the third matching part 223 is configured as a bending structure 225, the bent inner side of the bending structure 225 is wrapped around the outer side of the fourth matching part 224 facing away from the second matching part 222, and the third matching part 223 is rotatably supported on the bent inner wall of the bending structure 225.

[0064] For example, the third matching portion 223 is rotatably supported on the bent inner wall of the bent structure 225 , so that the fourth matching portion 224 of the slide rail 21 can be completely embedded in the groove 2230 .

[0065] In order to prevent the moving member 22 from getting stuck during movement, there are at least two third engaging portions 223, and the at least two third engaging portions 223 are spaced apart along the moving direction S of the moving member 22. In this way, during the movement of the moving member 22, the two third engaging portions 223 are always in contact with the slide rail 21, and the moving member 22 will not tilt.

[0066] Figure 3 This is a schematic structural diagram of the projection device provided in an embodiment of the present application as viewed from the inner side of the housing. Figure 4 This is a front view of the projection device provided in an embodiment of the present application.

[0067] In the embodiment of this application, Figure 2 、 Figure 3 、 Figure 4 A limit switch 211 electrically connected to the controller is provided on at least one of the slide rail 21 and the housing 10; there are two limit switches 211, which are spaced apart in the moving direction S of the moving component 20 and are used to detect the relative position information between the moving component 20 and the limit switch 211; the controller is also used to control the operation of the drive motor 220 according to the relative position information detected by the limit switch 211.

[0068] This can prevent the moving assembly 20 from driving the camera component 23 to move outside the two ends of the slide rail 21 and detach from the slide rail 21 .

[0069] In a specific implementation, a sensing portion 2212 is further provided at the end of the movable member 22 . The sensing portion 2212 can extend between two detection ends 2111 provided on each limit switch 211 , so that the limit switch 211 can detect the position of the movable member 22 .

[0070] In addition, combined Figure 1 、 Figure 3 、 Figure 4The housing 10 is also provided with a light-transmitting opening 11 for the camera component 23 to capture the projection image of the projection device 100. The light-transmitting opening 11 is located to the side of the slide rail 21, and a light-transmitting lens 12 is mounted on the light-transmitting opening 11. Here, the light-transmitting opening 11 can be a long strip-shaped notch extending along the movement direction S. In addition, the housing 10 is also provided with a light-emitting notch 13 for the projection unit of the projection device 100 to emit light. The light-emitting notch 13 is provided with a light-transmitting glass 131.

[0071] Figure 5 This is a flow chart of a method for correcting a projection image provided in an embodiment of the present application. Figure 6 A schematic diagram of the steps of a method for correcting a projection image provided in an embodiment of the present application.

[0072] Reference Figure 5 As shown, the second aspect of the embodiment of the present application provides a method for correcting a projection screen, which is used to perform trapezoidal correction on a projection screen projected by a projection device 100. The structure, function, and working principle of the projection device 100 have been described in detail and will not be repeated here.

[0073] As previously described, the projection device 100 includes a housing 10, a slide rail 21 disposed on the housing 10, and a movable assembly 20 and a camera component 23 connected thereto. The movable assembly 20 is movably disposed on the slide rail 21 and is capable of driving the camera component 23 to move on the slide rail 21. The method for correcting a projection image in an embodiment of the present application includes:

[0074] S10, controlling the moving assembly to drive the camera component to move to at least two different positions relative to the housing, and controlling the camera component to capture image information of a projection screen projected by the projection device when the camera component is at the at least two different positions;

[0075] S20, acquiring image information captured by the camera component at at least two different positions;

[0076] S30 , performing trapezoidal correction on the projection image projected by the projection device 100 according to the image information captured by the camera component at at least two different positions.

[0077] In the above scheme, the movable part 22 is controlled to drive the camera component 23 to move to at least two different positions on the slide rail 21, and the camera component 23 is controlled to capture image information of the projection screen projected by the projection device 100 at at least two different positions. In this way, the projection screen at at least two different positions can be captured by only one camera component 23. Compared with the scheme in which each position is separately equipped with a camera component 23, the cost of the projection correction mechanism is reduced.

[0078] In addition, the projection device 100 is calibrated based on the image information captured by the imaging component 23 at at least two different positions, which greatly improves the accuracy of the calibration compared to the calibration based on the image information captured at only one position.

[0079] Furthermore, in step S10, the steps of controlling the moving assembly 20 to drive the camera component 23 to move to at least two different positions relative to the housing 10 specifically include:

[0080] The drive motor 220 is controlled to drive the gears to rotate, thereby driving the camera unit 23 to move to at least two different positions relative to the slide rail 21. Thus, the camera unit 23's movement posture relative to the slide rail 21 can be controlled by controlling the start and stop of the drive motor 220, and the direction of movement of the camera unit 23 relative to the slide rail 21 can be controlled by controlling the forward and reverse rotation of the drive motor 220.

[0081] Furthermore, in the case where the limit switch 211 is provided, controlling the operation of the drive motor 220 may specifically include:

[0082] The operation of the driving motor 220 is controlled according to the relative position information detected by the limit switch 211. This can prevent the moving assembly 20 from driving the camera component 23 to move outside the two ends of the slide rail 21 and detach from the slide rail 21.

[0083] Specifically, when the moving member 22 drives the camera component 23 to move into the detection range of the limit switch 211, the limit switch 211 is triggered, and the driving motor 220 is controlled to stop running.

[0084] The following is a specific example to illustrate the correction method of the projected image. Figure 6 , the correction method of the projection image may include:

[0085] S101: After the projection device 100 is turned on, it is automatically triggered or receives a user's instruction to control the moving component 20 to drive the camera component 23 to move to the rightmost end of the slide rail 21 ( Figure 3 The right end of the middle figure) and captures the image information of the projection screen of the projection device 100 at this position;

[0086] S102: Control the moving assembly 20 to drive the camera component 23 to move to the leftmost end of the slide rail 21 ( Figure 3 The left end of the middle figure) and captures the image information of the projection screen projected by the projection device 100 at this position;

[0087] S103: Calculating the angle between the projection device 100 and the projection screen based on the image information captured in S101 and S102;

[0088] S104: Performing trapezoidal correction according to the angle information between the projection device 100 and the projection screen, for example, correcting the projection image to a 16:9 rectangle.

[0089] Figure 7 A schematic diagram of the structure of a projection image correction device provided in an embodiment of the present application.

[0090] Reference Figure 7 As shown, a third aspect of an embodiment of the present application provides a projection image correction device 200, comprising:

[0091] The movement control module 201 is used to control the movement assembly 20 to drive the camera component 23 to move to at least two different positions relative to the housing 10;

[0092] The camera control module 202 is used to control the camera 23 to capture image information of the projection screen projected by the projection device 100 at at least two different positions;

[0093] An acquisition module 203 acquires image information captured by the camera component 23 at at least two different positions;

[0094] A calculation module 204 is configured to calculate angle information between the projection device 100 and the projection screen based on image information captured by the camera component 23 at at least two different positions; and

[0095] The trapezoidal correction module 205 is configured to perform trapezoidal correction on the projection image projected by the projection device 100 according to the angle information.

[0096] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A projection device, characterized in that: include: a housing, wherein a slide rail is provided on the housing; A moving assembly, movably disposed on the slide rail; a camera component, disposed on the movable assembly, wherein the movable assembly is capable of driving the camera component to move on the slide rail so that the camera component is located at different positions relative to the housing; the camera component is configured to capture image information of a projection screen projected by the projection device when located at at least two of the different positions relative to the housing; a controller electrically connected to the camera component, and configured to perform trapezoidal correction on a projection image projected by the projection device according to the image information captured by the camera component at the at least two different positions; The moving assembly includes a moving part and a driving motor arranged on the moving part, a first matching part is provided on the driving shaft of the driving motor, and the slide rail includes a base and a second matching part provided on one side of the base, the first matching part and the second matching part cooperate to enable the camera component to move along the slide rail when the driving motor rotates; when the driving shaft of the driving motor rotates, it drives the first matching part to rotate, and the movement of the camera component relative to the slide rail is realized through the cooperation of the first matching part and the second matching part.

2. The projection device according to claim 1, wherein: The first matching portion is configured as a gear, and the second matching portion is configured as a rack capable of meshing with the gear.

3. The projection device according to claim 1, wherein: The drive motor is connected to the surface of the moving part facing away from the slide rail, and the drive shaft of the drive motor passes through the connecting part and extends toward the slide rail, and the first matching portion is connected to the partial shaft section of the drive shaft facing the slide rail.

4. The projection device according to claim 1, wherein: A third mating portion is also provided on the moving part, and the slide rail also includes a fourth mating portion provided on the other side of the base. The third mating portion is in rolling contact with the side of the fourth mating portion facing away from the second mating portion, and is configured so that at least part of the structure extends into the gap between the fourth mating portion and the shell to limit the third mating portion from disengaging from the fourth mating portion.

5. The projection device according to claim 4, characterized in that: The third matching portion is configured as a sliding wheel, and a groove is provided on the wheel surface of the sliding wheel; The fourth matching portion is configured as a convex strip extending along the length direction of the base, and the convex strip is embedded in the groove of the third matching portion so that at least part of the structure of the third matching portion extends into the gap between the fourth matching portion and the shell.

6. The projection device according to claim 4, characterized in that The end of the moving part corresponding to the third matching part is configured as a bending structure, the bent inner side of the bending structure is wrapped around the outer side of the fourth matching part away from the second matching part, and the third matching part is rotatably supported on the bent inner side wall of the bending structure.

7. The projection device according to claim 4, characterized in that The number of the third matching portions is at least two, and the at least two third matching portions are arranged at intervals along the moving direction of the moving member.

8. The projection device according to any one of claims 2 to 7, characterized in that: A limit switch electrically connected to the controller is provided on at least one of the slide rail and the housing; There are two limit switches, which are arranged at intervals in the moving direction of the moving component and are used to detect relative position information between the moving component and the limit switches; The controller is further configured to control the operation of the drive motor according to the relative position information detected by the limit switch.

9. The projection device according to any one of claims 1 to 7, characterized in that: The shell is also provided with a light-transmitting opening for the camera component to shoot the projection image of the projection device. The light-transmitting opening is located on the side of the slide rail, and a light-transmitting lens is installed on the light-transmitting opening.

10. A method for correcting a projection image, for performing trapezoidal correction on a projection image projected by a projection device, characterized in that: The projection device includes a housing, a slide rail provided on the housing, and a movable assembly and a camera component connected thereto. The movable assembly is movably provided on the slide rail and can drive the camera component to move on the slide rail. The projection image correction method includes: Controlling the moving assembly to drive the camera component to move to at least two different positions relative to the housing, and controlling the camera component to capture image information of the projection screen projected by the projection device when the camera component is at the at least two different positions; Acquiring the image information captured by the camera component at the at least two different positions; Performing trapezoidal correction on the projection image projected by the projection device according to the image information captured by the camera component at the at least two different positions; In which, the moving assembly includes a moving part and a driving motor arranged on the moving part, a first matching part is provided on the driving shaft of the driving motor, and the slide rail includes a base and a second matching part provided on one side of the base, and the first matching part and the second matching part cooperate to enable the camera component to move along the slide rail when the driving motor rotates; when the driving shaft of the driving motor rotates, it drives the first matching part to rotate, and the movement of the camera component relative to the slide rail is realized through the cooperation of the first matching part and the second matching part.

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