Projection device and control method of projection device

Abstract

The application relates to a projection device and a control method of the projection device, and relates to the technical field of projection. The projection device of one embodiment comprises a light source, a lens, a first driving assembly, a second driving assembly, a distance sensor, a memory and a controller. The controller is configured to execute instructions to make the projection device: acquire a first moving position of the first driving assembly, acquire a target projection ratio corresponding to the first moving position based on a first relationship curve; generate a second relationship curve corresponding to the target projection ratio, the second relationship curve being a curve of the corresponding relationship between the distance between the lens and a projection surface and the moving position of the second driving assembly when the projection ratio is the target projection ratio; acquire a projection distance between the lens and the projection surface; obtain a second moving position corresponding to the projection distance based on the second relationship curve, and control the second driving assembly to move to the second moving position. The embodiment can improve the definition of the projection picture on the projection surface and improve the projection quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of projection technology, and in particular, to a projection device, a control method of the projection device, a computer program medium, and a computer program product. BACKGROUND

[0002] With the development of projection technology, there is a demand for intelligent projection in various scenarios. In the scenario of intelligent projection, based on the size of the projection surface and the distance between the lens of the projection device and the projection surface, optical zoom processing is usually required during intelligent projection, so that a projection picture of a corresponding size can be displayed on the projection surface. However, after such optical zoom, the definition of the projection picture projected onto the projection surface will change, and in general cases, the definition will decrease, affecting the projection quality. SUMMARY

[0003] The present application provides a projection device, a control method of the projection device, a computer program medium, and a computer program product, to improve the definition of the projection picture projected onto the projection surface, improve the projection quality, and help improve the user experience.

[0004] In a first aspect, some embodiments provide a projection device, wherein the projection device comprises:

[0005] a light source configured to provide a light beam;

[0006] a lens configured to project the light beam provided by the light source to a projection surface;

[0007] a first driving component configured to drive the lens to change a focal length, so as to adjust a size of a projection picture projected by the lens to the projection surface;

[0008] a second driving component configured to control focusing of the lens, so as to adjust a definition of the projection picture projected by the lens to the projection surface;

[0009] a distance sensor configured to detect a distance between the lens and the projection surface;

[0010] a memory storing a first relationship curve and a relationship surface, the first relationship curve being a curve of a corresponding relationship between a moving position of the first driving component and a projection ratio of the lens, and the relationship surface being a surface of a corresponding relationship between the distance between the lens and the projection surface and a moving position of the second driving component;

[0011] a controller connected with the light source, the first driving component, the second driving component, the distance sensor, and the memory;

[0012] the controller is configured to:

[0013] In response to the driving action of the first driving component, the first moving position of the first driving component is obtained, and the target projection ratio corresponding to the first moving position is obtained based on the first relationship curve;

[0014] Based on the target projection ratio and the relationship surface, a second relationship curve corresponding to the target projection ratio is generated. The second relationship curve is the curve showing the relationship between the distance between the lens and the projection surface and the moving position of the second drive component under the target projection ratio.

[0015] Obtain the projection distance between the lens and the projection surface detected by the distance sensor;

[0016] Based on the second relationship curve, a second moving position corresponding to the projection distance is obtained, and the second driving component is controlled to move to the second moving position to adjust the clarity of the projected image on the projection surface.

[0017] Based on this embodiment, after the first driving component drives the lens to change its focal length, the projection device can adjust the size of the projected image on the projection surface, which helps to ensure that the size of the projected image on the projection surface meets the requirements. After the first driving component moves to the first moving position, the target projection ratio of the projection device in this state can be obtained through the first relationship curve. Based on the target projection ratio, a second relationship curve corresponding to the target projection ratio is generated from the relationship surface. That is, the generated second relationship curve corresponds to the target projection ratio in the current state and is an accurate focusing curve that conforms to the target projection ratio. Thus, the second moving position corresponding to the projection distance between the lens and the projection surface can be obtained from the second relationship curve. This second moving position is the position that the second driving component of the lens should be in when the clarity of the projected image on the projection surface is maximized when the projection device is at the target projection ratio and the distance between the lens and the projection surface is the projection distance. Thus, the second driving component can be controlled to move to the second moving position, which can improve the clarity of the projected image on the projection surface, improve the projection quality, and achieve fast and imperceptible zooming and focusing of the projection device's lens. The focusing process is fast, imperceptible to the user, highly accurate, saves focusing time, and improves the user experience.

[0018] In some embodiments, the controller is further configured to:

[0019] When the projection ratio of the projection device is at its minimum, the movement position of the second drive component is obtained when the projected image on the projection surface has maximum clarity under different projection distances between the lens and the projection surface, and a first focus curve is obtained based on different projection distances and the corresponding movement position of the second drive component.

[0020] The second driving assembly moves to the position when the projection picture on the projection surface has the maximum definition under the condition that the projection distance between the lens and the projection surface is different, and the position of the second driving assembly when the projection picture on the projection surface has the maximum definition is obtained based on the different projection distances and the corresponding positions of the second driving assembly.

[0021] The relationship surface is generated based on the first focusing curve and the second focusing curve.

[0022] According to the embodiment, when the relationship surface is obtained, the first focusing curve between the projection distance of the lens and the position of the second driving assembly when the projection picture on the projection surface has the maximum definition under the condition that the projection ratio of the projection device is the minimum projection ratio is obtained, that is, the first focusing curve under the minimum projection ratio is obtained, and the second focusing curve between the projection distance of the lens and the position of the second driving assembly when the projection picture on the projection surface has the maximum definition under the condition that the projection ratio of the projection device is the maximum projection ratio is obtained, that is, the second focusing curve under the maximum projection ratio is obtained, and the relationship surface is generated based on the first focusing curve and the second focusing curve. Since the first focusing curve under the minimum projection ratio and the second focusing curve under the maximum projection ratio are obtained, the focusing surface generated based on the first focusing curve and the second focusing curve can contain the information of the focusing curve between the minimum projection ratio and the maximum projection ratio, the accuracy of the obtained relationship surface is improved, and the accuracy of generating the second relationship curve of different projection ratios on the relationship surface is improved based on the obtained relationship surface, and the definition of the projection picture after the second driving assembly is controlled based on the obtained second relationship curve is improved.

[0023] In some embodiments, the controller is further configured to:

[0024] The first end point of the first focusing curve and the third end point of the second focusing curve are connected, and the second end point of the first focusing curve and the fourth end point of the second focusing curve are connected to generate the relationship surface.

[0025] The first end point of the first focusing curve is the position of the second driving assembly when the projection picture on the projection surface has the maximum definition under the condition that the projection distance between the lens and the projection surface is the minimum projection distance when the projection ratio of the projection device is the minimum projection ratio; and the second end point of the first focusing curve is the position of the second driving assembly when the projection picture on the projection surface has the maximum definition under the condition that the projection distance between the lens and the projection surface is the maximum projection distance when the projection ratio of the projection device is the minimum projection ratio.

[0026] The third endpoint of the second focusing curve is the moving position of the second driving assembly when the projection picture on the projection surface has the maximum definition in the case that the projection ratio of the projection device is the maximum projection ratio and the projection distance between the lens and the projection surface is the minimum projection distance.

[0027] Based on the embodiment, when the focusing surface is obtained based on the first focusing curve and the second focusing curve, the first endpoint of the first focusing curve is connected with the third endpoint of the second focusing curve, and the second endpoint of the first focusing curve is connected with the fourth endpoint of the second focusing curve, so that the focusing surface is obtained, which is simple and convenient.

[0028] In some embodiments, the controller is further configured to:

[0029] determine a proportional position of the target projection ratio in the projection ratio interval formed by the minimum projection ratio and the maximum projection ratio;

[0030] obtain a fifth endpoint of the second relationship curve based on the proportional position and the first endpoint and the third endpoint in the relationship surface, and / or obtain a sixth endpoint of the second relationship curve based on the proportional position and the second endpoint and the fourth endpoint in the relationship surface;

[0031] generate the second relationship curve based on the fifth endpoint and / or the sixth endpoint and the relationship surface.

[0032] Based on the embodiment, by determining the proportional position of the target projection ratio in the projection ratio interval formed by the minimum projection ratio and the maximum projection ratio, the second relationship curve corresponding to the target projection ratio can be conveniently generated based on the relationship surface, which is simple and convenient, and the generated second relationship curve corresponds to the target projection ratio, improves the accuracy of the obtained second relationship curve, and helps to improve the definition of the projection picture after the second driving assembly is controlled to move based on the obtained second relationship curve.

[0033] In some embodiments, the projection device further comprises a camera device;

[0034] The controller is further configured to:

[0035] When the projection ratio of the projection device is the minimum projection ratio or the maximum projection ratio, in the process of controlling the second driving assembly to move, an image obtained by the camera device capturing the projection surface is acquired after each time the second driving assembly is controlled to move.

[0036] obtaining the sharpness of the projection picture in the image, and obtaining the sharpness of the projection picture corresponding to the position of the second driving assembly after the second driving assembly moves based on the sharpness of the projection picture in the image.

[0037] According to the embodiment, when the projection ratio of the projection device is the minimum projection ratio or the maximum projection ratio, the image obtained by the camera device capturing the projection surface is obtained after the second driving assembly moves each time in the process of controlling the second driving assembly to move, and the sharpness of the projection picture in the obtained image is analyzed, so that the sharpness of the projection picture corresponding to the position of the second driving assembly after the second driving assembly moves can be obtained through image analysis, which is convenient and easy.

[0038] In some embodiments, the controller is further configured to:

[0039] When the projection ratio of the projection device is the minimum projection ratio or the maximum projection ratio, the second driving assembly is controlled to move at a first step length, and the sharpness of the projection picture corresponding to each moving position is recorded;

[0040] When the change trend of the sharpness changes from the increasing trend to the decreasing trend, the second driving assembly is controlled to move reversely at a second step length, and the sharpness of the projection picture corresponding to each moving position is recorded, the second step length being smaller than the first step length;

[0041] When the change trend of the sharpness after the second driving assembly moves reversely changes from the increasing trend to the decreasing trend, the second driving assembly is controlled to stop moving, and the moving position of the second driving assembly when the projection picture has the maximum sharpness is the moving position before the second driving assembly stops moving.

[0042] According to the embodiment, when the projection ratio of the projection device is the minimum projection ratio or the maximum projection ratio, the second driving assembly is controlled to move at a first step length first, and then until the change trend of the sharpness changes from the increasing trend to the decreasing trend, that is, the sharpness gradually increases and then decreases, which indicates that the position with the maximum sharpness has been passed, and then the second driving assembly is controlled to move reversely at a second step length smaller than the first step length, and until the change trend of the sharpness changes from the increasing trend to the decreasing trend again, which indicates that the position with the maximum sharpness is passed again, so that the moving position of the second driving assembly when the projection picture has the maximum sharpness is the moving position before the second driving assembly stops moving, and the moving position of the second driving assembly when the sharpness is maximum can be accurately detected, and through the way of moving large steps first and then small steps reversely, the position with the maximum sharpness can be gradually approached by small steps, and the accuracy of the moving position when the sharpness is maximum is further improved.

[0043] In some embodiments, the controller is further configured to:

[0044] The movement position of the second driving assembly is error-corrected by the preset return error to obtain the movement position of the second driving assembly.

[0045] Based on the embodiment, the movement position of the second driving assembly is also error-corrected by the preset return error to obtain the movement position of the second driving assembly, so that the accuracy of the obtained movement position of the second driving assembly can be improved, and the clarity of the projection picture can be further improved.

[0046] In some embodiments, the memory is further configured to store the preset return error.

[0047] The controller is further configured to:

[0048] The second driving assembly is controlled to move to the position of the limit switch, and the limit switch outputs the first level in the case that the second driving assembly moves to the position of the limit switch.

[0049] The second driving assembly is controlled to move reversely and move by the third step length, and the single-test return error is obtained based on the third step length and the movement step number in the case that the limit switch outputs the second level, the movement step number being the number of steps that the second driving assembly moves to the position before the limit switch outputs the second level.

[0050] The preset return error is obtained by the preset number of single-test return errors, and the preset return error is stored in the memory.

[0051] Based on the embodiment, the second driving assembly is first moved to the limit switch, and then reversely moved, and the single-test return error is determined based on the change of the level signal output by the limit switch, so that the change of the single-test return error can be accurately obtained, and the preset return error can be determined based on the preset number of single-test return errors, so that the influence of the single-test deviation is reduced, the accuracy of the obtained preset return error is improved, and the accuracy of the control of the movement of the second driving assembly is improved, and the clarity of the projection picture is further improved.

[0052] In some embodiments, the controller is further configured to:

[0053] The maximum value and the minimum value of the preset number of single-test return errors are removed, and the average value of the remaining single-test return errors is calculated to obtain the preset return error.

[0054] Based on the embodiment, when the preset return error is obtained by combining multiple single test return errors, the maximum value and the minimum value of the multiple single test return errors are removed, and the mean value of the remaining single test return errors is calculated as the preset return error, thereby avoiding the influence of the maximum value and the minimum value deviating too much on the accuracy of the return error, and further improving the accuracy of the obtained preset return error. On this basis, it is also helpful to improve the accuracy of the control of moving the second driving assembly, and to further improve the clarity of the projection picture.

[0055] In a second aspect, some embodiments provide a projection device, wherein the projection device comprises:

[0056] a light source configured to provide a light beam;

[0057] a lens configured to project the light beam provided by the light source to a projection surface;

[0058] a first driving assembly configured to drive the lens to change a focal length, so as to adjust a size of a projection picture projected by the lens to the projection surface;

[0059] a second driving assembly configured to control focusing of the lens, so as to adjust a clarity of the projection picture projected by the lens to the projection surface;

[0060] a distance sensor configured to detect a distance between the lens and the projection surface;

[0061] a memory storing a first relationship curve, a first focusing curve and a second focusing curve, the first relationship curve being a curve of a corresponding relationship between a moving position of the first driving assembly and a projection ratio of the lens, the first focusing curve being a curve of a corresponding relationship between the distance between the lens and the projection surface when the projection ratio of the lens is a minimum projection ratio and a moving position of the second driving assembly, and the second focusing curve being a curve of a corresponding relationship between the distance between the lens and the projection surface when the projection ratio of the lens is a maximum projection ratio and the moving position of the second driving assembly;

[0062] a controller connected with the light source, the first driving assembly, the second driving assembly, the distance sensor and the memory;

[0063] the controller is configured to execute instructions to make the projection device:

[0064] in response to a driving action on the first driving assembly, acquire a first moving position of the first driving assembly, and based on the first relationship curve, acquire a target projection ratio corresponding to the first moving position;

[0065] based on the target projection ratio, the first focusing curve and the second focusing curve, generate a second relationship curve corresponding to the target projection ratio, the second relationship curve being a curve of a corresponding relationship between the distance between the lens and the projection surface and a moving position of the second driving assembly under the target projection ratio.

[0066] obtain a projection distance between the lens and the projection surface based on the detection result of the distance sensor;

[0067] obtain a second movement position corresponding to the projection distance based on the second relationship curve, and control the second driving assembly to move to the second movement position to adjust the definition of the projection picture on the projection surface.

[0068] According to the projection device of the embodiment, after the first driving assembly drives the lens to change the focal length, the size of the projection picture projected by the lens on the projection surface can be adjusted, which helps to make the size of the projection picture projected on the projection surface meet the requirements. After the first driving assembly moves to the first movement position, the target projection ratio of the projection device in the state can be obtained based on the first relationship curve, and based on the target projection ratio, the first focusing curve corresponding to the minimum projection ratio, and the second focusing curve corresponding to the second projection ratio, the second relationship curve corresponding to the target projection ratio is generated, that is, the generated second relationship curve is the accurate focusing curve corresponding to the target projection ratio in the current state and meeting the target projection ratio. Therefore, the second movement position corresponding to the projection distance between the lens and the projection surface can be obtained from the second relationship curve. The second movement position is the position of the second driving assembly of the lens when the definition of the projection picture on the projection surface is the largest under the condition that the projection device is in the target projection ratio and the distance between the lens and the projection surface is the projection distance. Therefore, the second driving assembly can be controlled to move to the second movement position, which can improve the definition of the projection picture on the projection surface, improve the projection quality, and realize fast and imperceptible zooming and focusing of the lens of the projection device. The focusing process is fast, imperceptible to users, precise, saves focusing time, and improves user experience.

[0069] In some embodiments, the controller is further configured to:

[0070] determine a proportional position of the target projection ratio in a projection ratio interval formed by the minimum projection ratio and the maximum projection ratio;

[0071] obtain a fifth end point of the second relationship curve based on the proportional position, a first end point of the first focusing curve, and a third end point of the second focusing curve; and / or obtain a sixth end point of the second relationship curve based on the proportional position, a second end point of the first focusing curve, and a fourth end point of the second focusing curve;

[0072] generate the second relationship curve based on the fifth end point and / or the sixth end point, and the first focusing curve or the second focusing curve;

[0073] The second end point is the moving position of the second driving assembly when the projection ratio of the lens is the minimum projection ratio, the projection distance between the lens and the projection surface is the maximum projection distance, and the projection picture on the projection surface has the maximum definition.

[0074] The third end point is the moving position of the second driving assembly when the projection ratio of the lens is the maximum projection ratio, the projection distance between the lens and the projection surface is the minimum projection distance, and the projection picture on the projection surface has the maximum definition, and the fourth end point is the moving position of the second driving assembly when the projection ratio of the lens is the maximum projection ratio, the projection distance between the lens and the projection surface is the maximum projection distance, and the projection picture on the projection surface has the maximum definition.

[0075] Based on the embodiment, by determining the proportional position of the target projection ratio in the projection ratio interval formed by the minimum projection ratio and the maximum projection ratio, the fifth end point and / or the sixth end point of the second relationship curve can be calculated, and the second relationship curve corresponding to the target projection ratio can be conveniently generated based on the first focusing curve and / or the second focusing curve, which is simple and convenient, and the generated second relationship curve corresponds to the target projection ratio, improves the accuracy of the obtained second relationship curve, and helps to improve the definition of the projection picture after the second driving assembly is controlled based on the obtained second relationship curve.

[0076] In a third aspect, some embodiments provide a control method of a projection device, wherein the projection device comprises:

[0077] a lens configured to project a modulated projection light beam to a projection surface;

[0078] a first driving assembly configured to drive the lens to change a focal length to adjust a size of a projection picture projected by the lens to the projection surface;

[0079] a second driving assembly configured to control focusing of the lens to adjust a definition of the projection picture projected by the lens to the projection surface;

[0080] a distance sensor configured to detect a distance between the lens and the projection surface;

[0081] The method comprises:

[0082] In response to a driving action on the first driving assembly, a first moving position of the first driving assembly is obtained, and a target projection ratio corresponding to the first moving position is obtained based on a first relationship curve, the first relationship curve being a curve of a corresponding relationship between a moving position of the first driving assembly and a projection ratio of the lens;

[0083] generate a second relationship curve corresponding to the target projection ratio based on the target projection ratio and a relationship surface, the second relationship curve being a curve of a correspondence between a distance between the lens and the projection surface and a second movement position of the second driving assembly at the target projection ratio, the relationship surface being a surface of the correspondence between the distance between the lens and the projection surface and the second movement position of the second driving assembly;

[0084] obtain a projection distance between the lens and the projection surface detected by the distance sensor;

[0085] obtain a second movement position corresponding to the projection distance based on the second relationship curve, and control the second driving assembly to move to the second movement position to adjust the definition of the projection picture on the projection surface.

[0086] In a fourth aspect, some embodiments provide a control method of a projection device, wherein the projection device comprises:

[0087] a lens configured to project a modulated projection light beam to a projection surface;

[0088] a first driving assembly configured to drive the lens to change a focal length to adjust a size of a projection picture projected by the lens to the projection surface;

[0089] a second driving assembly configured to control focusing of the lens to adjust a definition of the projection picture projected by the lens to the projection surface;

[0090] a distance sensor configured to detect a distance between the lens and the projection surface;

[0091] The method comprises:

[0092] obtain a first movement position of the first driving assembly in response to a driving action of the first driving assembly, and obtain a target projection ratio corresponding to the first movement position based on a first relationship curve, the first relationship curve being a curve of a correspondence between the movement position of the first driving assembly and a projection ratio of the lens;

[0093] generate a second relationship curve corresponding to the target projection ratio based on the target projection ratio, a first focusing curve and a second focusing curve, wherein the first focusing curve is a curve of a correspondence between the distance between the lens and the projection surface and the movement position of the second driving assembly when the projection ratio of the lens is a minimum projection ratio, the second focusing curve is a curve of the correspondence between the distance between the lens and the projection surface and the movement position of the second driving assembly when the projection ratio of the lens is a maximum projection ratio, and the second relationship curve is a curve of the correspondence between the distance between the lens and the projection surface and the movement position of the second driving assembly at the target projection ratio;

[0094] obtain a projection distance between the lens and the projection surface detected by the distance sensor;

[0095] The second moving position corresponding to the projection distance is obtained based on the second relationship curve, and the second driving assembly is controlled to move to the second moving position to adjust the definition of the projection picture on the projection surface.

[0096] In a fifth aspect, some embodiments provide a computer readable storage medium, having stored thereon a computer program, wherein the computer program, when executed by a processor, implements the steps of the method in any of the above embodiments.

[0097] In a sixth aspect, some embodiments provide a computer program product, comprising a computer program, wherein the computer program, when executed by a processor, implements the steps of the method in any of the above embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0098] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0099] Figure 1 The related structure schematic diagram of the projection device provided by some embodiments of the present application is shown in the following figure.

[0100] Figure 2 The partial architecture schematic diagram of the projection device provided by some embodiments of the present application is shown in the following figure.

[0101] Figure 3 The software architecture schematic diagram of the focus control of the projection device provided by some embodiments of the present application is shown in the following figure.

[0102] Figure 4 The schematic diagram of the first focus curve, the second focus curve and the relationship surface of some embodiments of the present application is shown in the following figure.

[0103] Figure 5 The flowchart of the moving position of the second driving assembly when the maximum definition is obtained in some embodiments is shown in the following figure.

[0104] Figure 6 The flowchart of obtaining the preset return error in some embodiments is shown in the following figure.

[0105] Figure 7 The schematic diagram of the projection display area of the lens projection on the projection surface in some embodiments is shown in the following figure.

[0106] Figure 8 The interaction flowchart of the mutual cooperation between the components of the projection device in the process of the focus control of the projection device in some embodiments is shown in the following figure.

[0107] Figure 9 Flowchart of a control method of a projection device for some embodiments;

[0108] Figure 10 Flowchart of a control method of a projection device for some other embodiments. DETAILED DESCRIPTION

[0109] Embodiments will be described in detail below with reference to examples thereof shown in the attached drawings. In the following description, the same numbers are used to indicate the same or similar components. The implementation described in the following embodiments does not represent all implementations consistent with the present application. Rather, they are merely examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0110] It should be noted that the brief description of terms in the present application is only for the convenience of understanding the implementation described next, and is not intended to limit the implementation of the present application. Unless otherwise specified, these terms should be understood according to their ordinary and common meanings.

[0111] The terms "first", "second", "third", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar or like objects or entities, and do not necessarily mean a specific order or sequence, unless otherwise noted. It should be understood that the terms used in this way can be interchanged under appropriate circumstances.

[0112] The terms "include" and "have" and any variations thereof are intended to cover but not exclusive inclusion, for example, a product or device including a series of components does not necessarily limit to all components clearly listed, but can include other components not clearly listed or inherent to these products or devices.

[0113] The term "module" refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware or / and software code capable of performing a function associated with that element.

[0114] In the process of intelligent projection, in order to be able to project a projection picture of the desired picture size on the projection surface, it is usually necessary to perform optical zooming on the lens to make the projection picture of the corresponding size displayed on the projection surface. However, after such optical zooming, the definition of the projection picture projected onto the projection surface will change, and in most cases the definition will decrease, affecting the projection quality and user experience.

[0115] In order to improve the clarity of the projection picture, in the related manner, the image to be projected through the lens is processed through the software program, and the clarity of the projected projection picture is improved by improving the image resolution. However, this method does not essentially change the way of lens zooming, and the problem of low clarity still exists.

[0116] It is found through research that after the optical zooming of the lens, the size of the projection picture projected by the lens onto the projection surface changes. However, during zooming, the focal point of the lens also changes, which causes the signal of the picture to be projected not to be located at the focal point of the lens, thereby causing the clarity of the projection picture projected by the lens onto the projection surface to be difficult to reach a high level of clarity. Based on this, it can be considered that after the optical zooming of the lens, the focal point of the lens can be focused by driving the lens. Accordingly, the clarity of the projection picture projected by the lens onto the projection surface is improved, and the quality of the projection picture on the projection surface is improved.

[0117] Reference Figure 1 As shown in FIG. 1, a related structure schematic diagram of a projection device provided by the application embodiment is provided, the projection device 1000 comprises an optical machine 100, a controller 30, a first driving assembly 40, a second driving assembly 50, a distance sensor 60 and a memory 70. The optical machine 100 comprises a light source 10 and a lens 20, and the application scenario of the projection device 1000 also involves a projection surface 2000. Wherein:

[0118] The light source 10 is configured to provide a light beam.

[0119] The light source type of the light beam provided by the light source 10 is not limited, as long as the light beam of the light source provided by the light source can be projected onto the projection surface 2000 through the lens 20. In some embodiments, the light source 10 can be a light beam for providing a laser light beam or an LED (light emitting diode) light beam, but is not limited thereto.

[0120] It can be understood that the light beam provided by the light source 10 can be a light beam obtained by modulating the image signal to be displayed, so that the projection picture projected by the lens onto the projection surface is consistent with the content of the image signal to be displayed.

[0121] The lens 20 is configured to project the light beam provided by the light source 10 onto the projection surface 2000.

[0122] The specific form of the projection surface 2000 is not limited, which can be any type of plane, such as a wall surface, a curtain or any other form of plane provided, which is mainly used to display a projection picture consistent with the content of the image projected by the projection device 1000 on the projection surface 2000 when the light beam is projected onto the projection surface 2000 by the light source 10.

[0123] The first driving assembly 40 is configured to drive the lens 20 to change the focal length, so as to adjust the size of the projection picture projected by the lens 20 on the projection surface 2000.

[0124] The first driving assembly 40 is configured to drive the lens 20 to change the focal length, so as to adjust the size of the projection picture projected by the lens 20 on the projection surface 2000. The specific form of the first driving assembly 40 is not limited, for example, in some embodiments, the first driving assembly 40 can be a driving motor. The manner in which the first driving assembly 40 drives the lens 20 to change the focal length is not limited, as long as the zooming of the lens 20 can be realized through the driving of the first driving assembly 40, so that the size of the projection picture projected by the lens 20 on the projection surface 2000 changes.

[0125] The second driving assembly 50 is configured to control the focusing of the lens 20, so as to adjust the sharpness of the projection picture projected by the lens 20 on the projection surface 2000.

[0126] The second driving assembly 50 is configured to control the focusing of the lens 20, so as to adjust the sharpness of the projection picture projected by the lens 20 on the projection surface 2000. The specific form of the second driving assembly 50 is not limited, for example, in some embodiments, the second driving assembly 50 can be a driving motor. The manner in which the second driving assembly 50 drives the lens 20 to focus is not limited, as long as the focusing of the lens 20 can be realized through the driving of the second driving assembly 50, so as to adjust the sharpness of the projection picture projected by the lens 20 on the projection surface 2000.

[0127] The distance sensor 60 is configured to detect the distance between the lens 20 and the projection surface 2000.

[0128] The distance sensor 60 is configured to detect the distance between the lens 20 and the projection surface 2000. The type of the distance sensor 60 is not limited, as long as it can detect the distance between the lens 20 and the projection surface 2000. In the related embodiments of the present application, the distance sensor 60 can be a TOF (Time of flight) sensor. The TOF sensor can use a tiny emitter to emit infrared light or laser, and the generated light will bounce off any object and return to the sensor. According to the time difference between the emission time of the light and the time when the light reflected by the object returns to the sensor, the sensor can measure the distance between the object and the sensor, and in the embodiments of the present application, the distance between the lens 20 and the projection surface 2000 can be measured.

[0129] The storage 70 can be a storage built-in the projection device 1000, or the projection device 1000 can be provided with a storage interface, and the storage 70 is an external storage device connected with the storage interface. The specific form of the storage 70 is not limited, as long as it can store the data required to be stored by the projection device 1000 (such as the operating system, various software control programs, and the first relationship curve and the relationship surface related in the following embodiments, etc.), and read the corresponding data from the storage 70 when needed.

[0130] The type of the memory 70 is not limited and can include at least one of a non-volatile memory and a volatile memory. The non-volatile memory can include a Read-Only Memory (ROM), a magnetic tape, a floppy disk, a flash memory, an optical memory, a high-density embedded non-volatile memory, a Resistive Random Access Memory (ReRAM), a Magnetoresistive Random Access Memory (MRAM), a Ferroelectric Random Access Memory (FRAM), a Phase Change Memory (PCM), a graphene memory, etc. The volatile memory can include a Random Access Memory (RAM) or an external cache memory, etc. As an illustration but not a limitation, the RAM can be in a variety of forms, such as a Static Random Access Memory (SRAM) or a Dynamic Random Access Memory (DRAM), etc.

[0131] In some examples, the memory can include a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for running the operating system and the computer program in the non-volatile storage medium.

[0132] The controller 30 controls the operation of the projection device 1000 and responds to the user's operation through the operating system, various software control programs stored in the memory 70. The controller 30 is connected with the light source 10, the first driving assembly 40, the second driving assembly 50, the distance sensor 60, and the memory 70, and can achieve interaction and control with the light source 10, the first driving assembly 40, the second driving assembly 50, the distance sensor 60, and the memory 70. Some possible control modes of the controller 30 can be, for example: controlling the light source 10 to start and stop emitting light, controlling the light beam provided by the light source 30 based on the image signal to be displayed, controlling when the first driving assembly 40 and the second driving assembly 50 drive and the number of steps or the position to which the first driving assembly 40 and the second driving assembly 50 move to adjust the zoom and / or focus of the lens 20, controlling when the distance sensor 60 performs the distance measurement process, and performing subsequent related processing based on the distance measured by the distance sensor 60, reading data from the memory 70 and storing data to the memory 70, etc. It can be understood that the control and processing that the controller 30 can perform are not limited thereto.

[0133] With reference to the foregoing description, the projection device 1000 can be used in a variety of scenarios.Figure 1 As shown, in some embodiments, the projection device 1000 can further include a camera device 80, and the controller 30 is connected with the camera device 80. The controller 30 can control the camera device 80 to take a picture to obtain an image or a video stream. After the controller 30 obtains the image or the video stream taken by the camera device 80, the controller 30 can analyze the image or the video stream, and based on the analysis result, further processing can be performed.

[0134] The camera device 80 is a device capable of taking a picture to obtain an image or a video stream. The type of the camera device 80 is not limited. The camera device 80 can be a device capable of continuously taking a video stream, or a device capable of taking one image each time in response to a shooting instruction. The type of the camera device 1000 is not limited in the embodiments of the present application, as long as the camera device 1000 can take a picture to obtain an image on the projection surface 2000 after the first driving assembly 40 or the second driving assembly 50 moves. In some possible examples, the camera device 80 can be a camera.

[0135] It can be understood that the camera range of the camera device 80 covers all or part of the projection surface 2000. Taking the projection surface 2000 as a wall body for example, the camera range of the camera device 80 at least covers the area of the projection surface 2000 that needs to display a projection picture. In some embodiments, the lens of the camera device 80 can be set to have the same orientation as the lens 20 in the light machine 100, so as to cover the range of the area of the projection surface 2000 that displays the projection picture.

[0136] In order to perform relevant responses, processing and control, in some embodiments, the projection device 1000 can run an operating system. The operating system is a computer program used to manage and control hardware resources and software resources in the projection device 1000. The operating system can support running various application programs.

[0137] It should be noted that the operating system can be a native operating system based on a specific operating platform, a third-party operating system deeply customized based on a specific operating platform, or an independent operating system specially developed for the projection device.

[0138] The operating system can be divided into different modules or levels according to the functions implemented. For example, in some embodiments, the system is divided into four layers from top to bottom, namely, an application (Applications) layer (referred to as “application layer”), an application framework (Application Framework) layer (referred to as “framework layer”), a system library layer, and a kernel layer.

[0139] In some embodiments, the application layer is used to provide services and interfaces for applications, so that the projection device 1000 can run the applications. At least one application can run in the application layer, which can be a program provided by the operating system or an application developed by a third-party developer. In specific implementation, the application package in the application layer is not limited to the above examples.

[0140] The framework layer provides an application programming interface (API) and a programming framework for the applications. The application framework layer includes some pre-defined functions. The application framework layer is equivalent to a processing center that determines the actions of the applications in the application layer. The applications can access the resources in the system and obtain the services of the system through the API interface during execution.

[0141] In some embodiments, the system runtime library layer can provide support for the framework layer. When the framework layer is used, the operating system runs the instruction library included in the system runtime library layer, such as the C / C++ instruction library, to implement the functions of the framework layer.

[0142] In some embodiments, the kernel layer is a functional layer between the hardware and the software of the projection device 1000. The kernel layer can implement functions such as hardware abstraction, multitasking, memory management, etc. For example, the kernel layer can be configured with hardware drivers, and the kernel layer includes at least one of the following drivers: a camera driver, a WIFI driver, a USB driver, an HDMI driver, a sensor driver (such as a distance sensor, etc.), and a power supply driver, etc.

[0143] It should be noted that the above examples are only a simple division of the functions of the operating system, and do not constitute a limitation on the specific operating system form of the projection device 1000 in the embodiments of the present application. According to the functions of the projection device 1000, the type of the operating system, and other factors, the number and specific types of layers included in the operating system can be in other forms.

[0144] During the projection process, the projection device 1000 needs to control and process the zooming and focusing of the lens. Referring to FIG. 1, the projection device 1000 includes a lens 1001, a lens driving mechanism 1002, a lens driving mechanism 1003, and a lens driving mechanism 1004. Figure 2As shown, in the related architecture of the projection device 1000, the algorithm layer, the intermediate layer and the driving layer can also be divided according to the focusing control process, wherein the algorithm layer is provided with a focusing module and other related algorithms, the intermediate layer includes a driving motor, and the driving layer includes the driving of the camera and the driving of the TOF. Based on the related algorithms of the focusing module, the controller can control and drive the camera to capture images, control and drive the camera to measure the distance, and combine the results of inertial measurement, the obtained images and the distance obtained by distance measurement, and control the driving motor based on the focusing algorithm to achieve zoom and focusing of the lens or other related control.

[0145] Referring to Figure 2 As shown, the driving layer can also include the driving of the IMU (Inertial Measurement Unit), and the controller can also control and drive the IMU to perform inertial measurement based on the related algorithms of the focusing module, and combine the results of inertial measurement, the obtained images and the distance obtained by distance measurement, and control the driving motor based on the focusing algorithm to achieve zoom and focusing of the lens or other related control. The type of IMU is not limited, for example, it can include a gyroscope, etc.

[0146] Among them, when implementing zoom or focusing processing of the lens, there can be multiple different control methods. Referring to Figure 3 As shown, the focusing module or the related program of the focusing setting can be provided with programs corresponding to the related focusing algorithm, the entering algorithm and the obstacle avoidance algorithm. Among them, the focusing algorithm is an algorithm used to realize the focusing or zoom related processing, the entering algorithm is an algorithm related to the projection device and the projection surface, for example, calculating the projection distance based on the projection ratio to ensure that the projection device can accurately project the expected picture size and position on the projection surface after installation, controlling the opening and recovery of the screen in the case of the projection device being provided with a corresponding screen, and the obstacle avoidance algorithm is an algorithm that the projection device can intelligently identify the projection area obstacles to automatically avoid the related obstacles to avoid complicated manual operation. It can be understood that the focusing module can also be provided with other algorithms related to focusing control, which is not limited.

[0147] Meanwhile, referring to Figure 3 As shown, it can encapsulate these different algorithms in an encapsulated manner, and control by calling the encapsulated algorithm when needed. For example:

[0148] By calling the related algorithm of the non-inductive focusing, non-inductive focusing processing can be realized by storing the data related to the focusing (Focus) calibration in the memory;

[0149] If the non-sensing focusing does not meet the requirement or direct manual focusing / sensing focusing is needed, a service related to driving control is invoked to drive zooming or focusing of the lens;

[0150] If the image to be projected and displayed is zoomed, a service related to driving control is invoked to drive focusing or zooming so that the projected image displayed on the projection surface can be zoomed with the zooming of the image to be displayed;

[0151] If the entering or obstacle avoidance processing is needed, the entering or obstacle avoidance processing can be performed based on the parameters related to zoom calibration. If the image to be projected and displayed needs to be zoomed to meet the requirement of entering or obstacle avoidance, the image is zoomed, and then a service related to driving control is invoked to drive focusing or zooming so that the projected image displayed on the projection surface can be zoomed with the zooming of the image to be displayed;

[0152] When calibration is needed, the parameters related to zoom calibration and / or the parameters related to focus calibration can be obtained and stored in the memory to update the related parameters.

[0153] Based on the projection device 1000 as described above, in some embodiments of the present application:

[0154] The memory 70 stores a first relationship curve and a relationship surface, the first relationship curve being a curve of the corresponding relationship between the moving position of the first driving assembly 40 and the projection ratio of the lens 20, and the relationship surface being a surface of the corresponding relationship between the distance between the lens 20 and the projection surface 2000 and the moving position of the second driving assembly 50.

[0155] The controller 30 is configured to:

[0156] In response to the driving action of the first driving assembly 40, the first moving position of the first driving assembly 40 is obtained, and the target projection ratio corresponding to the first moving position is obtained based on the first relationship curve;

[0157] Based on the target projection ratio, a second relationship curve corresponding to the target projection ratio is generated from the relationship surface, the second relationship curve being a curve of the corresponding relationship between the distance between the lens 20 and the projection surface 2000 and the moving position of the second driving assembly 50 when the projection ratio is the target projection ratio;

[0158] The projection distance between the lens 20 and the projection surface 2000 detected by the distance sensor 60 is obtained;

[0159] The second moving position corresponding to the projection distance is obtained based on the second relationship curve, and the second driving assembly 70 is controlled to move based on the second moving position to adjust the clarity of the projected image on the projection surface.

[0160] The first movement position of the first driving assembly 40 can be obtained in various ways. For example, the first movement position of the first driving assembly 40 can be calculated based on the position of the first driving assembly 40 before movement, the movement step, the movement direction and the movement times of the first driving assembly 40. For another example, the first movement position of the first driving assembly 40 can be detected by a detection device after movement of the first driving assembly 40. For another example, the first movement position of the first driving assembly 40 can be determined by the controller 30 based on the signals received from the detection device after movement of the first driving assembly 40. It can be understood that the first movement position of the first driving assembly 40 can also be obtained in other ways.

[0161] The first relationship curve is also referred to as a projection ratio curve or a Zoom curve, which represents the corresponding relationship between the movement position of the first driving assembly 40 and the projection ratio of the lens 30. Therefore, after obtaining the first movement position of the first driving assembly 40, the projection ratio corresponding to the first movement position can be obtained from the first relationship curve, and the projection ratio is taken as the target projection ratio. The first relationship curve can be provided by the manufacturer and built in the memory of the projection device when the lens is manufactured.

[0162] The projection ratio can be the ratio of the distance between the lens and the screen to the size of the picture. When the height of the picture is constant, the projection ratio can also be the ratio of the distance between the lens and the screen to the width of the picture. The projection ratio range of the projection device is determined when the projection device is manufactured, and therefore, the size range of the image picture that can be projected on the screen by the projection device at a certain distance between the projection device and the screen can be determined according to the projection ratio and the distance between the projection device and the screen.

[0163] The relationship surface is a surface representing the corresponding relationship between the distance between the lens 20 and the projection surface 2000 and the movement position of the second driving assembly 50. In essence, the relationship surface is the relationship between the distance between the lens 20 and the projection surface 2000 and the focusing position of the second driving assembly 50 (i.e., the movement position of the second driving assembly 50). The relationship surface can be generated based on the focusing curves at different projection ratios, but is not limited thereto.

[0164] After the target projection ratio is obtained, a second relationship curve corresponding to the target projection ratio can be generated based on the curved surface of the distance between the lens 20 and the projection surface 2000 and the corresponding relationship between the moving position of the second driving assembly 50, that is, the second relationship curve is a curve of the distance between the lens 20 and the projection surface 2000 and the corresponding relationship between the moving position of the second driving assembly 50 when the projection ratio of the projection device is the target projection ratio, that is, the second relationship curve is the focusing curve of the lens when the projection ratio of the lens is the target projection ratio.

[0165] After the second relationship curve is obtained, the second moving position corresponding to the projection distance between the lens 20 and the projection surface 2000 can be determined based on the second relationship curve, that is, the clarity of the projection picture on the projection surface 2000 is the highest when the lens 20 is located at the second moving position, so that the second driving assembly 70 can be controlled to move based on the second moving position to adjust the clarity of the projection picture on the projection surface.

[0166] The manner in which the second driving assembly 70 is controlled to move to the second moving position is not limited, and in some embodiments, the second driving assembly 70 can be moved to the initial position point and then moved to the second moving position. In other embodiments, the moving direction and moving distance (such as moving step and moving times) of the second driving assembly 70 can be determined based on the current position of the second driving assembly 70 and the second moving position, and then the second driving assembly 70 can be controlled to move to the second moving position based on the determined moving direction and moving distance. It can be understood that in other embodiments, the second driving assembly 70 can also be controlled to move to the second moving position in other manners.

[0167] The projection device based on this embodiment can adjust the size of the projection picture projected by the lens onto the projection surface after the first driving assembly drives the lens to change the focal length, which helps to make the size of the projection picture projected onto the projection surface meet the requirements. After the first driving assembly moves to the first moving position, the target projection ratio of the projection device in this state can be obtained through the first relationship curve, and the second relationship curve corresponding to the target projection ratio can be generated based on the target projection ratio from the second relationship curved surface, that is, the second relationship curve is the accurate focusing curve that meets the target projection ratio, which corresponds to the target projection ratio in the current state. Therefore, the second moving position corresponding to the projection distance between the lens and the projection surface can be obtained from the second relationship curve, that is, the second driving assembly of the lens should be located at the position when the clarity of the projection picture on the projection surface is the highest under the condition that the projection ratio of the projection device is the target projection ratio and the distance between the lens and the projection surface is the projection distance. Therefore, the second driving assembly can be controlled to move to the second moving position, which can improve the clarity of the projection picture on the projection surface and improve the projection quality, and helps to improve the user experience.

[0168] In some embodiments, the memory 70 stores a first relationship curve, a first focus curve and a second focus curve, the first relationship curve being a curve of a corresponding relationship between a moving position of the first driving assembly and a projection ratio of the lens, the first focus curve being a curve of a corresponding relationship between a distance between the lens and a projection surface when the projection ratio of the lens is a minimum projection ratio and a moving position of the second driving assembly, and the second focus curve being a curve of a corresponding relationship between the distance between the lens and the projection surface when the projection ratio of the lens is a maximum projection ratio and the moving position of the second driving assembly;

[0169] The controller 30 is configured to:

[0170] In response to a driving action on the first driving assembly, obtain a first moving position of the first driving assembly, and obtain a target projection ratio corresponding to the first moving position based on the first relationship curve;

[0171] Based on the target projection ratio, the first focus curve and the second focus curve, generate a second relationship curve corresponding to the target projection ratio, the second relationship curve being a curve of a corresponding relationship between the distance between the lens and the projection surface when the projection ratio is the target projection ratio and the moving position of the second driving assembly;

[0172] Obtain a projection distance between the lens and the projection surface detected by the distance sensor;

[0173] Obtain a second moving position corresponding to the projection distance based on the second relationship curve, and control the second driving assembly to move to the second moving position to adjust the definition of the projected image on the projection surface.

[0174] Based on the projection device of the embodiment, after the first driving assembly drives the lens to change the focal length, the size of the projection picture projected by the lens on the projection surface can be adjusted, which helps to make the size of the projection picture projected on the projection surface meet the demand. After the first driving assembly moves to the first moving position, the target projection ratio of the projection device in this state can be obtained through the first relationship curve. Based on the target projection ratio, in combination with the first focusing curve corresponding to the minimum projection ratio and the second focusing curve corresponding to the second projection ratio, the second relationship curve corresponding to the target projection ratio is generated, that is, the generated second relationship curve is the accurate focusing curve corresponding to the target projection ratio in the current state and meeting the target projection ratio. Therefore, the second moving position corresponding to the projection distance between the lens and the projection surface can be obtained from the second relationship curve. The second moving position is the position of the second driving assembly of the lens when the definition of the projection picture on the projection surface is the largest under the condition that the projection ratio of the projection device is the target projection ratio and the distance between the lens and the projection surface is the projection distance. Therefore, the second driving assembly can be controlled to move to the second moving position, which can improve the definition of the projection picture on the projection surface, improve the projection quality, and realize fast and imperceptible zooming and focusing of the lens of the projection device. The focusing process is fast, imperceptible to users, high in precision, saves focusing time, and improves user experience.

[0175] In some embodiments, the controller 30 is further configured to:

[0176] When the projection ratio of the projection device 1000 is the minimum projection ratio, the moving position of the second driving assembly 50 when the projection picture on the projection surface 2000 has the maximum definition under the condition that the distance between the lens 20 and the projection surface 2000 has different projection distances is obtained, and based on the different projection distances and the corresponding moving positions of the second driving assembly 50, the first focusing curve is obtained.

[0177] When the projection ratio of the projection device 1000 is the maximum projection ratio, the moving position of the second driving assembly 50 when the projection picture on the projection surface 2000 has the maximum definition under the condition that the distance between the lens 20 and the projection surface 2000 has different projection distances is obtained, and based on the different projection distances and the corresponding moving positions of the second driving assembly 50, the second focusing curve is obtained.

[0178] The relationship surface is generated based on the first focusing curve and the second focusing curve.

[0179] The range of the minimum projection ratio and the maximum projection ratio of the projection device 1000 is a characteristic parameter set when the projection device 1000 is manufactured. The manner of controlling the projection ratio of the projection device 1000 to be the minimum projection ratio and the maximum projection ratio is not limited. For example, by locating the first driving assembly 40 of the projection device 1000 at the minimum stroke position or the maximum stroke position in the stroke range of the first driving assembly 40, respectively, the projection ratio of the projection device 1000 can be controlled to be the minimum projection ratio and the maximum projection ratio. The minimum stroke position is a position corresponding to the minimum stroke in the stroke range of the first driving assembly 30, and the maximum stroke position is a position corresponding to the maximum stroke in the stroke range of the first driving assembly 30.

[0180] Based on this embodiment, when obtaining the relationship surface, the first focusing curve between the projection distance of the lens and the movement position of the second driving assembly when the projection ratio of the projection device is the minimum projection ratio and the projection picture has the maximum definition is obtained, that is, the first focusing curve when the minimum projection ratio is obtained, and the second focusing curve between the projection distance of the lens and the movement position of the second driving assembly when the projection ratio of the projection device is the maximum projection ratio and the projection picture has the maximum definition is obtained, that is, the second focusing curve when the maximum projection ratio is obtained, and the relationship surface is generated by combining the first focusing curve and the second focusing curve. Since the first focusing curve of the minimum projection ratio and the second focusing curve of the maximum projection ratio have been obtained, the focusing surface generated on this basis can contain the information of the focusing curve between the minimum projection ratio and the maximum projection ratio, improve the accuracy of the obtained relationship surface, and help to improve the accuracy of the focusing curve of different projection ratios generated on the relationship surface on this basis, and help to improve the definition of the projection picture after the movement of the second driving assembly controlled on the basis of the obtained focusing curve.

[0181] After obtaining the first focusing curve and the second focusing curve, the manner of generating the focusing surface based on the first focusing curve and the second focusing curve is not limited.

[0182] In some embodiments, the controller is further configured to:

[0183] connecting the first end point of the first focusing curve and the third end point of the second focusing curve, and connecting the second end point of the first focusing curve and the fourth end point of the second focusing curve to generate the relationship surface;

[0184] The first endpoint of the first focusing curve is a moving position of the second driving assembly when the projection picture on the projection surface has the maximum definition in the case that the projection ratio of the projection device is the minimum projection ratio and the projection distance between the lens and the projection surface is the minimum projection distance; and the second endpoint of the first focusing curve is a moving position of the second driving assembly when the projection picture on the projection surface has the maximum definition in the case that the projection ratio of the projection device is the minimum projection ratio and the projection distance between the lens and the projection surface is the maximum projection distance.

[0185] The third endpoint of the second focusing curve is a moving position of the second driving assembly when the projection picture on the projection surface has the maximum definition in the case that the projection ratio of the projection device is the maximum projection ratio and the projection distance between the lens and the projection surface is the minimum projection distance; and the fourth endpoint of the second focusing curve is a moving position of the second driving assembly when the projection picture on the projection surface has the maximum definition in the case that the projection ratio of the projection device is the maximum projection ratio and the projection distance between the lens and the projection surface is the maximum projection distance.

[0186] Reference Figure 4 As shown in FIG. 1, the curve L1 is the first focusing curve, A1 and B1 are respectively the first endpoint and the second endpoint of the first focusing curve L1, the curve L2 is the second focusing curve, A2 and B2 are respectively the third endpoint and the fourth endpoint of the second focusing curve L2, and the focusing surface generated based on the first focusing curve L1 and the second focusing curve L2 can be obtained by connecting the first endpoint A1 and the third endpoint B1 and connecting the second endpoint A2 and the fourth endpoint B2.

[0187] Based on the embodiment, when the focusing surface is obtained based on the first focusing curve and the second focusing curve, the focusing surface can be obtained by connecting the first endpoint of the first focusing curve and the first endpoint of the second focusing curve and connecting the second endpoint of the first focusing curve and the second endpoint of the second focusing curve, which is simple and convenient.

[0188] In some embodiments, the controller 30 is further configured to:

[0189] In some embodiments, the controller 30 is further configured to:

[0190] determine a proportional position of the target projection ratio in the projection ratio interval formed by the minimum projection ratio and the maximum projection ratio;

[0191] obtain a fifth endpoint of the second relationship curve based on the proportional position and the first endpoint and the third endpoint in the relationship surface, and / or obtain a sixth endpoint of the second relationship curve based on the proportional position and the second endpoint and the fourth endpoint in the relationship surface;

[0192] The fifth end point and / or the sixth end point are based on, and a second relationship curve is generated based on the relationship surface.

[0193] In combination Figure 4 In the example shown, assuming that the projection ratios of the first focus curve L1 and the second focus curve L2 are 0.9 and 1.5 respectively, the target projection ratio obtained by calculation is 1.2, i.e., the target projection ratio is located in the middle of the projection ratio interval, the first end point A1 and the third end point B1 can be combined to determine the mean value of the two, and the fifth end point Ak is obtained, and the second end point B1 and the fourth end point B2 are combined to determine the mean value of the two, and the sixth end point Bk is obtained.

[0194] After obtaining the fifth end point Ak and the sixth end point Bk, since the shapes of the focus curves under different projection ratios are the same, the second relationship curve Lk can be obtained on this basis.

[0195] It can be understood that in the case where the target projection ratio is located at other positions in the projection ratio interval, similar calculation and processing can be performed, which will not be described here.

[0196] In some embodiments, when the second relationship curve is generated after the fifth end point Ak and the sixth end point Bk are obtained, the specific manner is not limited. Since the shapes of the focus curves corresponding to different projection ratios are the same, the first end point A1 of the first focus curve L1 or the second end point A2 of the second focus curve can be moved to the fifth end point Ak, or the second end point B1 of the first focus curve L1 or the fourth end point B2 of the second focus curve can be moved to the sixth end point Bk, to obtain a moved curve, which is the second relationship curve. In other embodiments, the fifth end point Ak and the sixth end point Bk can be combined, and a curve between the fifth end point Ak and the sixth end point Bk that conforms to the curve shape of the curve in the relationship surface can be directly generated based on the curve shape, to obtain the second relationship curve. It can be understood that in other embodiments, the second relationship curve can also be generated by other manners.

[0197] Based on this embodiment, by determining the proportional position of the target projection ratio in the projection ratio interval formed by the minimum projection ratio and the maximum projection ratio, the second relationship curve corresponding to the target projection ratio can be conveniently generated based on the relationship surface, which is simple and convenient, and the generated second relationship curve corresponds to the target projection ratio, improving the accuracy of the obtained second relationship curve and helping to improve the clarity of the projection picture after the second driving assembly is moved based on the obtained second relationship curve.

[0198] In some embodiments, the controller 30 is further configured to:

[0199] determine the proportional position of the target projection ratio in the projection ratio interval formed by the minimum projection ratio and the maximum projection ratio;

[0200] calculate a fifth endpoint of the second relationship curve based on the proportional position, and a first endpoint of the first focus curve, and a third endpoint of the second focus curve; and / or, calculate a sixth endpoint of the second relationship curve based on the proportional position, and a second endpoint of the first focus curve, and a fourth endpoint of the second focus curve;

[0201] generate the second relationship curve based on the fifth endpoint and / or the sixth endpoint, and the first focus curve or the second focus curve;

[0202] wherein the first endpoint is a moving position of the second driving assembly when a projection screen on the projection surface has the maximum definition in a case that the projection ratio of the lens is the minimum projection ratio and the projection distance between the lens and the projection surface is the minimum projection distance, and the second endpoint is a moving position of the second driving assembly when the projection screen on the projection surface has the maximum definition in a case that the projection ratio of the lens is the minimum projection ratio and the projection distance between the lens and the projection surface is the maximum projection distance;

[0203] the third endpoint is a moving position of the second driving assembly when the projection screen on the projection surface has the maximum definition in a case that the projection ratio of the lens is the maximum projection ratio and the projection distance between the lens and the projection surface is the minimum projection distance, and the fourth endpoint is a moving position of the second driving assembly when the projection screen on the projection surface has the maximum definition in a case that the projection ratio of the lens is the maximum projection ratio and the projection distance between the lens and the projection surface is the maximum projection distance.

[0204] In the case of generating the second relationship curve after obtaining the fifth endpoint Ak and / or the sixth endpoint Bk, the specific manner is not limited. Since the shapes of the corresponding focus curves under different projection ratios are the same, the first endpoint A1 of the first focus curve L1 or the second endpoint A2 of the second focus curve can be moved to the fifth endpoint Ak, or the second endpoint B1 of the focus curve L1 or the fourth endpoint B2 of the second focus curve can be moved to the sixth endpoint Bk, to obtain a moved curve, which is the second relationship curve.

[0205] Based on this embodiment, by determining the proportional position of the target projection ratio in the projection ratio interval formed by the minimum projection ratio and the maximum projection ratio, the fifth endpoint and / or the sixth endpoint of the second relationship curve can be calculated, and the second relationship curve corresponding to the target projection ratio can be conveniently generated based on the first focus curve and / or the second focus curve. The second relationship curve is simple and convenient, and corresponds to the target projection ratio, which improves the accuracy of the obtained second relationship curve and helps to improve the definition of the projection screen after the second driving assembly is controlled based on the obtained second relationship curve.

[0206] In the process of obtaining the first focus curve and the second focus curve, the way of obtaining the sharpness of the projection picture is not limited. In some embodiments, the controller 30 is further configured to:

[0207] When the projection ratio of the projection device 1000 is the minimum projection ratio or the maximum projection ratio, in the process of controlling the movement of the second driving assembly 50, after each movement of the second driving assembly 50, the image obtained by the camera device 80 shooting the projection surface is acquired;

[0208] The sharpness of the projection picture in the image is acquired, and the sharpness of the projection picture corresponding to the position of the second driving assembly 50 after movement is obtained based on the sharpness of the projection picture in the image.

[0209] In some embodiments, the camera device 80 can be controlled to shoot after the movement of the second driving assembly 50 to obtain the image, and in other embodiments, in the case that the camera device 80 can continuously shoot a video stream, the image can also be obtained by taking a screenshot of the video stream shot by the camera device 80 after the movement of the second driving assembly 50. It can be understood that the image after the movement of the second driving assembly 50 can also be obtained by other control methods.

[0210] After the image is obtained, the way of obtaining the sharpness of the projection picture in the image is not limited. It can be understood that the obtained image can include the projection picture and can also include the boundary area of the projection picture. In general, in order to better present the projection picture, the projection surface 2000 is usually a white plane or a plane with a pure color close to white, so the sharpness of the remaining image can be analyzed after removing the pure color part of the boundary in the image.

[0211] The way of calculating the sharpness of the obtained image is not limited, for example, the Tenengrad gradient method, the Laplacian gradient method, or the variance method can be used to calculate the sharpness of the image, and it can be understood that other methods not listed can also be used to calculate the sharpness of the obtained image.

[0212] Based on this embodiment, when the projection ratio of the projection device is the minimum projection ratio or the maximum projection ratio, in the process of controlling the movement of the second driving assembly, after each movement of the second driving assembly, the projection surface is shot by the camera device to obtain the shot image, and the sharpness of the projection picture in the obtained image is analyzed, so that the sharpness of the projection picture corresponding to the position of the second driving assembly after movement can be obtained by image analysis, which is convenient and convenient.

[0213] When the projection ratio of the projection device is the minimum projection ratio or the maximum projection ratio, in the process of controlling the second driving assembly to move to obtain the moving position of the second driving assembly at which the projection picture on the projection surface has the maximum definition, the second driving assembly can be controlled to move in a large-step first and a small-step second manner, and the moving position of the second driving assembly at which the projection picture has the maximum definition can be obtained more accurately.

[0214] Accordingly, in some embodiments, the controller 30 is further configured to:

[0215] When the projection ratio of the projection device 1000 is the minimum projection ratio, the second driving assembly 50 is controlled to move at a first step length, and the definition of the projection picture corresponding to each moving position is recorded;

[0216] When the variation trend of the definition changes from the increasing trend to the decreasing trend, the second driving assembly 50 is controlled to move reversely at a second step length, the definition of the projection picture corresponding to each moving position is recorded, and the second step length is smaller than the first step length;

[0217] When the variation trend of the definition changes from the increasing trend to the decreasing trend after the second driving assembly 50 is reversed, the second driving assembly 50 is controlled to stop moving, and the previous moving position before stopping moving is taken as the moving position of the second driving assembly 50 at which the projection picture has the maximum definition.

[0218] It can be understood that the controller 30 is further configured to:

[0219] When the projection ratio of the projection device 1000 is the maximum projection ratio, the second driving assembly 50 is controlled to move at a first step length, and the definition of the projection picture corresponding to each moving position is recorded;

[0220] When the variation trend of the definition changes from the increasing trend to the decreasing trend, the second driving assembly 50 is controlled to move reversely at a second step length, the definition of the projection picture corresponding to each moving position is recorded, and the second step length is smaller than the first step length;

[0221] When the variation trend of the definition changes from the increasing trend to the decreasing trend after the second driving assembly 50 is reversed, the second driving assembly 50 is controlled to stop moving, and the previous moving position before stopping moving is taken as the moving position of the second driving assembly 50 at which the projection picture has the maximum definition.

[0222] In the process of obtaining the first focusing curve and / or the second focusing curve, after the projection ratio of the projection device 1000 is set to the minimum projection ratio or the maximum projection ratio, the process of controlling the movement of the second driving assembly 50 can be as shown in Figure 5 .

[0223] In combination Figure 5As shown, after setting the projection ratio of the projection device 1000 to the minimum projection ratio or the maximum projection ratio, the current position of the second driving assembly 50 is taken as a starting point, an image is obtained by the camera 80, the definition of the projection image in the obtained image is analyzed, and the current position and the corresponding definition are recorded, for example, added to the first position-definition queue.

[0224] At this time, since there is only one set of position-definition data in the first position-definition queue, there is no trend of change in definition. If the second driving assembly 50 is not at the boundary position of the stroke range of the second driving assembly 50, the second driving assembly 50 is controlled to move by the first step length. If the second driving assembly 50 is at the boundary position of the stroke range of the second driving assembly 50, the second driving assembly 50 is controlled to move by the first step length in the reverse direction, or in other words, the second driving assembly 50 is controlled to move by the first step length in a direction away from the boundary position within the stroke range.

[0225] After the movement of the second driving assembly 50, an image is obtained by the camera 80, the definition of the projection image in the obtained image is analyzed, and the position after the movement and the definition corresponding to the position after the movement are recorded, for example, added to the first position-definition queue.

[0226] After each set of position-definition data is added to the first position-definition queue, it is determined whether there is a trend of first increase and then decrease in definition, that is, whether there is a trend of first increase and then decrease in definition.

[0227] If there is no trend of first increase and then decrease in definition, it is determined whether the second driving assembly 50 is currently at the boundary position of the stroke range of the second driving assembly 50. If the second driving assembly 50 is not at the boundary position of the stroke range of the second driving assembly 50, the second driving assembly 50 is controlled to move by the first step length. If the second driving assembly 50 is at the boundary position of the stroke range of the second driving assembly 50, the second driving assembly 50 is controlled to move by the first step length in the reverse direction, or in other words, the second driving assembly 50 is controlled to move by the first step length in a direction away from the boundary position within the stroke range.

[0228] The above process is repeated until the trend of first increase and then decrease in definition appears.

[0229] The way of determining the trend of first increase and then decrease in definition is not limited, and in some embodiments, assuming that the relevant position points in the position-definition queue are p1, p2, and p3, and the corresponding definitions are s1, s2, and s3, and s1 < s2 and s2 > s3, when the second driving assembly moves to the p3 position, since it has been detected that the definition s3 of the p3 position has decreased relative to s2, it is directly determined that the trend of first increase and then decrease has appeared.

[0230] In other embodiments, to reduce the impact of single-shot errors on accuracy, a trend of first increasing and then decreasing may be determined only when the sharpness at H consecutive positions decreases. Taking the relevant positions in the queue as p11, p12, p13, and p14 in sequence as an example, assuming the corresponding sharpnesses are s11, s12, s13, and s14 respectively, and s11...<s12,s12> If s13 > s14, and H is 2, then it can be determined that a trend of first increasing and then decreasing sharpness has occurred. If H is 3, then a trend of first increasing and then decreasing sharpness can only be determined if the sharpness s5 corresponding to the next position point p5 is less than s4.

[0231] If a trend of first increasing and then decreasing resolution occurs, it indicates that the movement of the second drive component 50 has passed the position corresponding to maximum resolution. At this point, the point of descent is taken as the starting point, and the second drive component is controlled to reverse. In some embodiments, the point of descent can be the position point corresponding to the determination of the trend of first increasing and then decreasing resolution. When H is 2, and s1...<s2,s2> If, for example, when s3 > s4, a trend of first increasing and then decreasing clarity is observed, then position point p4 can be set as the initial point.

[0232] At this point, since the descent point has corresponding clarity, the second drive component 50 can be directly controlled to move a second step length after the second drive component 50 reverses, where the second step length is less than the first step length.

[0233] After the second drive component 50 moves, the image acquired by the camera device 80 is obtained, and the clarity of the projected image in the image is analyzed. The position after the movement and the clarity corresponding to the position after the movement are recorded, for example, by adding them to the second position clarity queue.

[0234] It is understandable that the first positional sharpness queue and the second positional sharpness queue can be the same queue. As long as after the initial determination that there is a trend of sharpness increasing and then decreasing and the second driving component is controlled to reverse, the position point and corresponding sharpness at the time of reversal can be combined with subsequent position-sharpness data to analyze whether there is a trend of sharpness increasing and then decreasing.

[0235] In other embodiments, when the first positional sharpness queue and the second positional sharpness queue are the same queue, after initially determining that there is a trend of sharpness increasing and then decreasing and controlling the second drive component to reverse, only the position point and corresponding sharpness at the time of reversal can be retained, while other position-sharpness data in the first positional sharpness queue can be cleared to obtain the second positional sharpness queue.

[0236] In some embodiments, the first position sharpness queue and the second position sharpness queue can also be different queues. After the first determination of the trend of the sharpness rising and then falling and the control of the second driving assembly reversing, the last set of data in the first position sharpness queue, i.e., the position point and the corresponding sharpness when reversing, can be added to the second position sharpness queue, so that the position-sharpness data of the position when reversing can be added to the second position sharpness queue without repeating the analysis of the sharpness, which can help to improve the processing efficiency.

[0237] After each set of position-sharpness data is added to the second position sharpness queue, whether there is a trend of the sharpness rising and then falling, i.e., the trend of the sharpness rising and then falling, is determined. The way of determining the trend of the sharpness rising and then falling is the same as the above way.

[0238] If there is no trend of the sharpness rising and then falling, the second driving assembly 50 is controlled to move the second step size until the trend of the sharpness rising and then falling appears. If the trend of the sharpness rising and then falling appears, the maximum sharpness position P is obtained based on the recorded position-sharpness records.

[0239] Taking the case that the trend of the sharpness rising and then falling is determined when the sharpness of the consecutive H positions all decreases as an example, assuming that the relevant position points in the queue after the second driving assembly 50 reverses are p21, p22, p23, and p24 in turn, and the corresponding sharpnesses are s21, s22, s23, and s42, respectively, and s21

[0240] After the projection ratio of the projection device 1000 is set to the minimum projection ratio, the above process can be performed after the distance between the lens 20 and the projection surface 2000 is set each time to obtain the position of the second driving assembly when the sharpness of the projection picture is the largest at the distance, so as to obtain a plurality of sets of distance-position data. In combination with the plurality of sets of data, a curve, i.e., the first focusing curve, can be fitted. The first focusing curve in one specific example is shown as the curve L1 in Figure 4 .

[0241] Similarly, after the projection ratio of the projection device 1000 is set to the maximum projection ratio, the above process can be performed after the distance between the lens 20 and the projection surface 2000 is set each time to obtain the position of the second driving assembly when the sharpness of the projection picture is the largest at the distance, so as to obtain a plurality of sets of distance-position data. In combination with the plurality of sets of data, a curve, i.e., the second focusing curve, can be fitted. The second focusing curve in one specific example is shown as the curve L2 in Figure 4 .

[0242] Based on this embodiment, after setting the projection ratio of the projection device 1000 to the minimum projection ratio or the maximum projection ratio, the second driving assembly is first controlled to move at a first step, and then until the change trend of the definition changes from the increasing trend to the decreasing trend, that is, the definition gradually increases and then decreases, indicating that the position of the maximum definition has been passed, and then the driving assembly is controlled to move in the opposite direction and at a second step smaller than the first step, and until the change trend of the definition changes from the increasing trend to the decreasing trend again, indicating that the position of the maximum definition has been passed again, so that the previous moving position of the stop moving can be taken as the moving position of the second driving assembly when the projection picture has the maximum definition, the moving position of the second driving assembly when the definition is maximum can be accurately detected, and by moving in the first large step, moving in the opposite direction, and then moving in the second small step, the moving position of the maximum definition can be gradually approached in small steps, and the accuracy of the moving position of the maximum definition obtained is further improved.

[0243] In some embodiments, the controller 30 is further configured to:

[0244] The moving position of the second driving assembly is subjected to error elimination processing by the preset backstroke error, and the moving position of the second driving assembly 50 is obtained.

[0245] The backstroke error refers to the absolute value of the difference between the values indicated by the measuring instrument in different stroke directions under the same conditions and the measured value. Since the second driving assembly 50 will have a backstroke error when turning around, the error elimination processing needs to be performed in combination with the backstroke error during the control of the movement of the second driving assembly 50, so as to improve the accuracy.

[0246] Based on this embodiment, after controlling the second driving assembly to move in the opposite direction, the moving position is subjected to error elimination processing by the preset backstroke error, so as to obtain the moving position of the second driving assembly, thereby improving the accuracy of the obtained moving position of the second driving assembly and helping to further improve the definition of the projection picture.

[0247] In some embodiments, the memory 70 is further configured to store the preset backstroke error.

[0248] Meanwhile, in combination with Figure 6 As shown in the figure, the controller 30 is further configured to:

[0249] The second driving assembly 50 is controlled to move to the position of the limit switch, and the limit switch outputs a first level when the second driving assembly 50 moves to the position of the limit switch. The type of the first level is not limited, for example, high level or low level.

[0250] The second driving assembly 50 is controlled to move reversely and at a third step length, and when the limit switch outputs a second level, a single test return difference is obtained based on the third step length and a moving step number, the moving step number being a step number of the second driving assembly when the second driving assembly moves to a position before the second driving assembly moves to the position where the limit switch outputs the second level at the third step length; the second level being a level opposite to the first level. When the first level is a high level, the second level is a low level. If the limit switch outputs the second level when the second driving assembly moves N steps, the single test return difference can be obtained based on the third step length and the moving step number N-1.

[0251] The preset return error is obtained based on the preset number of single test return differences, and the preset return error is stored in the memory.

[0252] The limit switch is an electrical switch used to limit the movement limit position of the second driving assembly 50. When the second driving assembly 50 approaches or moves to the position where the limit switch is located, the limit switch outputs a first level signal. When the second driving assembly 50 moves away from the limit switch, the limit switch outputs a second level signal. The specific implementation of the limit switch is not limited.

[0253] The specific step length range of the third step length is not limited, which can be set to be the same as or different from the second step length or the first step length.

[0254] The way of obtaining the single test return difference based on the third step length and the moving step number is not limited. Assuming that the limit switch outputs a signal changing from the first level signal to the second level signal when the second driving assembly 50 moves N steps reversely at the third step length, the single test return difference of this time is N-1 steps, or the length distance of the product of N-1 steps and the third step length.

[0255] The specific value of the preset number is not limited, which can be determined comprehensively according to the need for accuracy or the requirement for test efficiency.

[0256] Based on this embodiment, when the preset return error is obtained, the second driving assembly 50 is moved to the limit switch, and then the single test return difference is determined based on the change of the level signal output by the limit switch after the second driving assembly is reversed. The change of the level signal output by the limit switch can accurately know the change of the single return error, and the preset return error can be determined comprehensively based on the preset number of single test return differences, which reduces the influence of single test deviation and improves the accuracy of the obtained preset return error. On this basis, it is also helpful to improve the accuracy of the control of moving the second driving assembly and to further improve the clarity of the projection picture.

[0257] In some embodiments, the controller 30 is further configured to:

[0258] Remove the maximum and minimum of the preset number of single test return error, and calculate the average of the remaining single test return error to obtain the preset return error.

[0259] Based on this embodiment, when combining multiple single test return errors to obtain the preset return error, the maximum and minimum of multiple single test return errors are removed, and the average of the remaining single test return error is calculated as the preset return error, thereby avoiding the influence of the maximum and minimum deviating too much on the accuracy of the return error, further improving the accuracy of the obtained preset return error, and on this basis, also helping to improve the accuracy of the control of moving the second driving assembly, and further improving the clarity of the projection picture.

[0260] In some embodiments, the controller 30 is configured to:

[0261] determine the projection picture area in the image obtained by the camera device 80;

[0262] determine the center point of the projection picture area;

[0263] determine the distance between the lens and the center point of the projection picture area as the distance between the lens 20 and the projection surface 2000.

[0264] Wherein, the way of determining the center point of the projection picture area is not limited, in combination with Figure 7 As shown in the figure, assuming that the projection picture formed by the lens 20 on the projection surface 2000 is the projection picture area 2002 formed by J1, J2, J3, J4, and the shooting range of the camera device 80 is the area 2001, then after obtaining the image shot by the camera device 80, the projection picture area 2002 is identified from the image, or the vertices J1, J2, J3, J4 of the projection picture area 2002 are identified, and then the center point of the projection picture area 2002 is obtained. Generally, the projection picture area 2002 projected on the projection surface is usually a rectangle, so the corner points of the line connecting the vertex J1 and the vertex J3, and the line connecting the vertex J2 and the vertex J4, such as O point shown in the figure, can be taken as the center point of the projection picture area. It can be understood that in the case of other shapes of the projection picture, the center point of the projection picture area can also be obtained by other ways. Figure 7

[0265] Based on this embodiment, when determining the distance between the lens and the projection surface 2000, the distance between the center point of the projection picture area in the image obtained by shooting and the lens 20 is taken as the distance between the lens 20 and the projection surface 30, which is simple and convenient.

[0266] In some embodiments, the controller 30 is configured to:​

[0267] Determine the projected image area in the image captured by camera device 80;

[0268] Determine the boundary vertices of the projected image area;

[0269] The average distance between the lens 20 and each boundary vertex of the projected image area is determined as the distance between the lens 20 and the projection surface 2000.

[0270] Similarly combined Figure 7 Taking the example shown, after identifying the projection area 2002 from the image, or identifying the vertices J1, J2, J3, and J4 of the projection area 2002, the average of the four distances—the distance between lens 20 and vertex J1, the distance between lens 20 and vertex J1, the distance between lens 20 and vertex J1, and the distance between lens 20 and vertex J1—can be used as the distance between lens 20 and the projection surface 2000. It is understandable that if the projection image has other shapes, the average distance between lens 20 and each boundary vertex of the projection area can also be obtained through other methods.

[0271] Based on this embodiment, when determining the distance between the lens and the projection surface 2000, the average distance between the boundary vertices of the projected image area in the captured image and the lens is used as the distance between the lens and the projection surface. Since the error in the distance measurement is the same value each time, the distance measurement can be performed by calculating the average distance of multiple vertices, which can reduce the impact caused by the error to a certain extent. This method is simple and convenient.

[0272] Based on the example above, Figure 8 This diagram illustrates the interactive flow of various components of a projection device during focus control, serving as an example.

[0273] When the position of the first drive component 40 is adjusted by the program or by the user based on the required size of the projected image on the projection surface, the first drive component 40 drives the zoom of the adjustment lens 20 to adjust the size of the projected image on the projection surface 2000.

[0274] After the first drive component 40 adjusts its moving position, the controller 30 obtains the first moving position after the first drive component 40 adjusts its moving position, and obtains the target projection ratio corresponding to the first moving position from the stored first relationship curve (such as the zoom curve configured by the lens at the factory), and generates a second relationship curve (i.e. the focus curve corresponding to the target projection ratio) based on the stored relationship surface (i.e. the focus surface) based on the target projection ratio.

[0275] The controller 30 acquires the distance obtained by the TOF ranging sensor measurement, and obtains the second movement position corresponding to the measured distance from the second relationship curve, and controls the second driving assembly 50 to move to the second movement position to drive the lens to focus, thereby improving the definition of the projection picture projected on the projection surface.

[0276] Some embodiments of the present application also provide a control method of a projection device,

[0277] Reference Figure 9 The control method of the projection device in some embodiments includes:

[0278] Step S901: acquiring a first movement position of the first driving assembly in response to a driving action on the first driving assembly;

[0279] Step S902: acquiring a target projection ratio corresponding to the first movement position based on a first relationship curve, the first relationship curve being a curve of the corresponding relationship between the movement position of the first driving assembly and the projection ratio of the lens;

[0280] Step S903: generating a second relationship curve corresponding to the target projection ratio based on the target projection ratio and a relationship surface, the second relationship curve being a curve of the corresponding relationship between the distance between the lens and the projection surface and the movement position of the second driving assembly under the target projection ratio, and the relationship surface being a surface of the corresponding relationship between the distance between the lens and the projection surface and the movement position of the second driving assembly;

[0281] Step S904: acquiring a projection distance between the lens and the projection surface detected by a distance sensor;

[0282] Step S905: acquiring a second movement position corresponding to the projection distance based on the second relationship curve, and controlling the second driving assembly to move to the second movement position to adjust the definition of the projection picture on the projection surface.

[0283] Reference Figure 10 The control method of the projection device in some embodiments includes:

[0284] Step S1001: acquiring a first movement position of the first driving assembly in response to a driving action on the first driving assembly;

[0285] Step S1002: acquiring a target projection ratio corresponding to the first movement position based on a first relationship curve, the first relationship curve being a curve of the corresponding relationship between the movement position of the first driving assembly and the projection ratio of the lens;

[0286] Step S1003: generating a second relationship curve corresponding to the target projection ratio based on the target projection ratio, the first focus curve and the second focus curve, wherein the first focus curve is a curve of the distance between the lens and the projection surface corresponding to the moving position of the second driving assembly when the projection ratio of the lens is the minimum projection ratio, the second focus curve is a curve of the distance between the lens and the projection surface corresponding to the moving position of the second driving assembly when the projection ratio of the lens is the maximum projection ratio, and the second relationship curve is a curve of the distance between the lens and the projection surface corresponding to the moving position of the second driving assembly when the target projection ratio.

[0287] Step S1004: obtaining the projection distance between the lens and the projection surface detected by the distance sensor.

[0288] Step S1005: obtaining the second moving position corresponding to the projection distance based on the second relationship curve, and controlling the second driving assembly to move to the second moving position to adjust the definition of the projected picture on the projection surface.

[0289] In some embodiments, the control method of the projection device further includes:

[0290] obtaining the first focus curve based on the different projection distances and the corresponding moving positions of the second driving assembly when the projection device has the minimum projection ratio and the projected picture on the projection surface has the maximum definition under the condition that the distance between the lens and the projection surface has different projection distances.

[0291] obtaining the second focus curve based on the different projection distances and the corresponding moving positions of the second driving assembly when the projection device has the maximum projection ratio and the projected picture on the projection surface has the maximum definition under the condition that the distance between the lens and the projection surface has different projection distances.

[0292] generating a relationship surface based on the first focus curve and the second focus curve.

[0293] In some embodiments, the control method of the projection device further includes:

[0294] connecting the first end point of the first focus curve with the third end point of the second focus curve and connecting the second end point of the first focus curve with the fourth end point of the second focus curve to generate the relationship surface.

[0295] The first endpoint of the first focusing curve is a position of the second driving assembly when the projection screen has the maximum definition, the projection ratio of the projection device is the minimum projection ratio, and the projection distance between the lens and the projection screen is the minimum projection distance. The second endpoint of the first focusing curve is a position of the second driving assembly when the projection screen has the maximum definition, the projection ratio of the projection device is the maximum projection ratio, and the projection distance between the lens and the projection screen is the maximum projection distance.

[0296] The third endpoint of the second focusing curve is a position of the second driving assembly when the projection screen has the maximum definition, the projection ratio of the projection device is the minimum projection ratio, and the projection distance between the lens and the projection screen is the minimum projection distance. The fourth endpoint of the second focusing curve is a position of the second driving assembly when the projection screen has the maximum definition, the projection ratio of the projection device is the maximum projection ratio, and the projection distance between the lens and the projection screen is the maximum projection distance.

[0297] In some embodiments, the control method of the projection device further includes:

[0298] determining a proportional position of the target projection ratio in a projection ratio interval formed by the minimum projection ratio and the maximum projection ratio;

[0299] obtaining a fifth endpoint of the second relationship curve based on the proportional position and the first endpoint and the third endpoint in the relationship surface, and / or obtaining a sixth endpoint of the second relationship curve based on the proportional position and the second endpoint and the fourth endpoint in the relationship surface;

[0300] generating the second relationship curve based on the fifth endpoint and / or the sixth endpoint and the relationship surface.

[0301] In some embodiments, the control method of the projection device further includes:

[0302] when the projection ratio of the projection device is the minimum projection ratio or the maximum projection ratio, obtaining an image of the projection screen captured by the camera device during the control of the movement of the second driving assembly.

[0303] obtaining the definition of the projection screen in the image, and obtaining the definition of the projection screen corresponding to the position of the second driving assembly after the movement based on the definition of the projection screen in the image.

[0304] In some embodiments, the control method of the projection device further includes:

[0305] When the projection ratio of the projection device is the minimum projection ratio or the maximum projection ratio, the second driving assembly is controlled to move at a first step length, and the definition of the projection picture corresponding to each moving position is recorded;

[0306] When the change trend of the definition changes from the increasing trend to the decreasing trend, the second driving assembly is controlled to move reversely at a second step length, the definition of the projection picture corresponding to each moving position is recorded, and the second step length is smaller than the first step length;

[0307] When the change trend of the definition changes from the increasing trend to the decreasing trend after the second driving assembly is controlled to move reversely, the second driving assembly is controlled to stop moving, and the last moving position before the second driving assembly stops moving is taken as the moving position of the second driving assembly when the projection picture has the maximum definition.

[0308] In some embodiments, the control method of the projection device further includes:

[0309] The moving position of the second driving assembly is subjected to error elimination processing by a preset return error to obtain the moving position of the second driving assembly.

[0310] In some embodiments, the control method of the projection device further includes:

[0311] The second driving assembly is controlled to move to the position of the limit switch, and the limit switch outputs the first level in the case that the second driving assembly moves to the position of the limit switch;

[0312] The second driving assembly is controlled to move reversely at a third step length, and the single test return error is obtained based on the third step length and the moving step number in the case that the limit switch outputs the second level, the moving step number being the moving step number of the second driving assembly when the second driving assembly moves to the last moving position before the limit switch outputs the second level at the third step length;

[0313] The preset return error is obtained by the preset number of single test return errors, and the preset return error is stored in the memory.

[0314] In some embodiments, the control method of the projection device further includes:

[0315] The proportional position of the target projection ratio in the projection ratio interval formed by the minimum projection ratio and the maximum projection ratio is determined;

[0316] The fifth end point of the second relationship curve is calculated and obtained based on the proportional position, the first end point of the first focusing curve, and the third end point of the second focusing curve, and / or the sixth end point of the second relationship curve is calculated and obtained based on the proportional position, the second end point of the first focusing curve, and the fourth end point of the second focusing curve;

[0317] generate a second relationship curve based on the fifth end point and / or the sixth end point, and the first focusing curve or the second focusing curve;

[0318] The first end point is a moving position of the second driving assembly when a projection screen on the projection surface has the maximum definition in the case that the projection ratio of the lens is the minimum projection ratio and the projection distance between the lens and the projection surface is the minimum projection distance, and the second end point is a moving position of the second driving assembly when the projection screen on the projection surface has the maximum definition in the case that the projection ratio of the lens is the minimum projection ratio and the projection distance between the lens and the projection surface is the maximum projection distance.

[0319] The third end point is a moving position of the second driving assembly when the projection screen on the projection surface has the maximum definition in the case that the projection ratio of the lens is the maximum projection ratio and the projection distance between the lens and the projection surface is the minimum projection distance, and the fourth end point is a moving position of the second driving assembly when the projection screen on the projection surface has the maximum definition in the case that the projection ratio of the lens is the maximum projection ratio and the projection distance between the lens and the projection surface is the maximum projection distance.

[0320] It should be understood that, although each step in the flowchart involved in each embodiment as described above is shown in sequence according to the arrow, these steps are not necessarily executed in sequence according to the arrow. Unless explicitly stated herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other sequences. Moreover, at least part of the steps in the flowchart involved in each embodiment as described above can include multiple steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of these steps or stages is not necessarily sequential, but can be executed in rotation or alternation with at least part of other steps or steps or stages in other steps.

[0321] Based on the same inventive concept, the embodiments of the present application also provide a control device of a projection device for implementing the control method of the projection device as described above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, and therefore the specific limitations in one or more control device embodiments of the projection device provided below can refer to the limitations of the projection method of the projection device described above, which will not be described here again.

[0322] In one embodiment, a projection device of a projection device is provided, comprising:

[0323] The target projection ratio acquisition module is configured to acquire a first movement position of the first driving assembly in response to a driving action on the first driving assembly, and acquire a target projection ratio corresponding to the first movement position based on a first relationship curve, the first relationship curve being a curve of a corresponding relationship between movement positions of the first driving assembly and a projection ratio of the lens.

[0324] The curve generation module is configured to generate a second relationship curve corresponding to the target projection ratio based on the target projection ratio and a relationship surface, the second relationship curve being a curve of a corresponding relationship between a distance between the lens and the projection surface and a movement position of the second driving assembly under the target projection ratio, and the relationship surface being a surface of a corresponding relationship between the distance between the lens and the projection surface and the movement position of the second driving assembly.

[0325] The distance acquisition module is configured to acquire a projection distance between the lens and the projection surface detected by the distance sensor.

[0326] The movement control module is configured to acquire a second movement position corresponding to the projection distance based on the second relationship curve, and control the second driving assembly to move to the second movement position to adjust the definition of the projected image on the projection surface.

[0327] In one embodiment, a control device of a projection device is provided, comprising:

[0328] The target projection ratio acquisition module is configured to acquire a first movement position of the first driving assembly in response to a driving action on the first driving assembly, and acquire a target projection ratio corresponding to the first movement position based on a first relationship curve, the first relationship curve being a curve of a corresponding relationship between movement positions of the first driving assembly and a projection ratio of the lens.

[0329] The curve generation module is configured to generate a second relationship curve corresponding to the target projection ratio based on the target projection ratio, a first focusing curve and a second focusing curve, the first focusing curve being a curve of a corresponding relationship between the distance between the lens and the projection surface and the movement position of the second driving assembly when the projection ratio of the lens is a minimum projection ratio, the second focusing curve being a curve of a corresponding relationship between the distance between the lens and the projection surface and the movement position of the second driving assembly when the projection ratio of the lens is a maximum projection ratio, and the second relationship curve being a curve of a corresponding relationship between the distance between the lens and the projection surface and the movement position of the second driving assembly under the target projection ratio.

[0330] The distance acquisition module is configured to acquire a projection distance between the lens and the projection surface detected by the distance sensor.

[0331] The movement control module is configured to acquire a second movement position corresponding to the projection distance based on the second relationship curve, and control the second driving assembly to move to the second movement position to adjust the definition of the projected image on the projection surface.

[0332] Each of the modules in the control method of the projection device can be implemented by software, hardware, or a combination thereof, in whole or in part. Each of the modules can be embedded in or independent of a processor in a computer device in hardware form, or stored in a memory in the computer device in software form, so as to be invoked by the processor to perform the operations corresponding to each of the modules.

[0333] In some embodiments, a computer readable storage medium is provided, having stored thereon a computer program, which, when executed by a processor, implements the steps of the control method of the projection device in any of the embodiments described above.

[0334] In some embodiments, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the steps of the control method of the projection device in any of the embodiments described above.

[0335] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (Read-Only Memory, ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric memory (Ferroelectric Random Access Memory, FRAM), phase change memory (Phase Change Memory, PCM), graphene memory, etc. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0336] Any combination of the technical features of the above embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0337] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A projection device, characterized by The projection device comprises: a light source configured to provide a light beam; a lens configured to project the light beam provided by the light source to a projection surface; a first driving component configured to drive the lens to change a focal length, so as to adjust a size of a projection picture projected by the lens to the projection surface; a second driving component configured to control focusing of the lens, so as to adjust a definition of the projection picture projected by the lens to the projection surface; a distance sensor configured to detect a distance between the lens and the projection surface; a memory configured to store a first relationship curve and a relationship surface, the first relationship curve being a curve of a corresponding relationship between a moving position of the first driving component and a projection ratio of the lens, and the relationship surface being a surface of a corresponding relationship between the distance between the lens and the projection surface and a moving position of the second driving component; a controller connected with the light source, the first driving component, the second driving component, the distance sensor and the memory; the controller is configured to execute instructions to make the projection device: obtain a first moving position of the first driving component in response to a driving action of the first driving component, and obtain a target projection ratio corresponding to the first moving position based on the first relationship curve; generate a second relationship curve corresponding to the target projection ratio based on the target projection ratio and the relationship surface, the second relationship curve being a curve of a corresponding relationship between the distance between the lens and the projection surface and the moving position of the second driving component under the target projection ratio; obtain a projection distance between the lens and the projection surface detected by the distance sensor; obtain a second moving position corresponding to the projection distance based on the second relationship curve, and control the second driving component to move to the second moving position, so as to adjust the definition of the projection picture on the projection surface.

2. The projection device according to claim 1, characterized in that, the controller is further configured to: obtain a first focusing curve based on different projection distances and corresponding moving positions of the second driving component, when the projection picture on the projection surface has the maximum definition under different projection distances between the lens and the projection surface and different moving positions of the second driving component, when the projection ratio of the projection device is the minimum projection ratio; obtain a second focusing curve based on different projection distances and corresponding moving positions of the second driving component, when the projection picture on the projection surface has the maximum definition under different projection distances between the lens and the projection surface and different moving positions of the second driving component, when the projection ratio of the projection device is the maximum projection ratio; generate the relationship surface based on the first focusing curve and the second focusing curve.

3. The projection device according to claim 2, characterized in that, the controller is further configured to: connect a first end point of the first focusing curve with a third end point of the second focusing curve, and connect a second end point of the first focusing curve with a fourth end point of the second focusing curve, so as to generate the relationship surface. The first endpoint of the first focusing curve is a moving position of the second driving assembly when the projection screen has the maximum definition under the condition that the projection ratio of the projection device is the minimum projection ratio and the projection distance between the lens and the projection screen is the minimum projection distance; the second endpoint of the first focusing curve is a moving position of the second driving assembly when the projection screen has the maximum definition under the condition that the projection ratio of the projection device is the maximum projection ratio and the projection distance between the lens and the projection screen is the maximum projection distance; The third endpoint of the second focusing curve is a moving position of the second driving assembly when the projection screen has the maximum definition under the condition that the projection ratio of the projection device is the maximum projection ratio and the projection distance between the lens and the projection screen is the minimum projection distance; the fourth endpoint of the second focusing curve is a moving position of the second driving assembly when the projection screen has the maximum definition under the condition that the projection ratio of the projection device is the maximum projection ratio and the projection distance between the lens and the projection screen is the maximum projection distance.

4. The projection apparatus according to claim 3, wherein, The controller is further configured to: determine a proportional position of the target projection ratio in a projection ratio interval formed by the minimum projection ratio and the maximum projection ratio; obtain a fifth endpoint of a second relationship curve based on the proportional position and the first endpoint and the third endpoint in the relationship surface; and / or, obtain a sixth endpoint of a second relationship curve based on the proportional position and the second endpoint and the fourth endpoint in the relationship surface; generate the second relationship curve based on the fifth endpoint and / or the sixth endpoint and the relationship surface.

5. The projection apparatus according to claim 2, wherein, The projection device further comprises a camera device; The controller is further configured to: in the process of controlling the second driving assembly to move when the projection ratio of the projection device is the minimum projection ratio or the maximum projection ratio, acquire an image obtained by the camera device capturing the projection screen after each time the second driving assembly is controlled to move; acquire the definition of the projection screen in the image, and obtain the definition of the projection screen corresponding to the position of the second driving assembly after moving based on the definition of the projection screen in the image.

6. The projection apparatus according to claim 2, wherein, The controller is further configured to: control the second driving assembly to move with a first step length when the projection ratio of the projection device is the minimum projection ratio or the maximum projection ratio, and record the definition of the projection screen corresponding to each moving position; control the second driving assembly to move reversely with a second step length when the change trend of the definition changes from the increasing trend to the decreasing trend, and record the definition of the projection screen corresponding to each moving position, the second step length being smaller than the first step length; stop the second driving assembly from moving when the change trend of the definition changes from the increasing trend to the decreasing trend after the second driving assembly is controlled to move reversely, and take the moving position of the second driving assembly before stopping moving as the moving position of the second driving assembly when the projection screen has the maximum definition.

7. The projection device according to claim 6, characterized in that, The controller is further configured to: perform error elimination processing on the moving position of the second driving assembly by using a preset return error to obtain the moving position of the second driving assembly.

8. The projection apparatus according to claim 7, wherein, The memory is further configured to store the preset return error. The controller is further configured to: control the second driving assembly to move to the position of the limit switch, and in the case that the second driving assembly moves to the position of the limit switch, the limit switch outputs a first level; control the second driving assembly to move reversely and with a third step length, and in the case that the limit switch outputs a second level, obtain a single test return error based on the third step length and a moving step number, the moving step number being the number of steps that the second driving assembly moves when moving to the position of the limit switch outputting the second level from the previous moving position of the limit switch outputting the second level; obtain the preset return error by using a preset number of single test return errors, and store the preset return error to the memory.

9. A projection apparatus, characterized by comprising: The projection device comprises: a light source configured to provide a light beam; a lens configured to project the light beam provided by the light source to a projection surface; a first driving assembly configured to drive the lens to change a focal length to adjust a size of a projection picture projected by the lens to the projection surface; a second driving assembly configured to control focusing of the lens to adjust a definition of the projection picture projected by the lens to the projection surface; a distance sensor configured to detect a distance between the lens and the projection surface; a memory storing a first relationship curve, a first focusing curve and a second focusing curve, the first relationship curve being a curve of a corresponding relationship between a moving position of the first driving assembly and a projection ratio of the lens, the first focusing curve being a curve of a corresponding relationship between the distance between the lens and the projection surface and the moving position of the second driving assembly when the projection ratio of the lens is a minimum projection ratio, and the second focusing curve being a curve of a corresponding relationship between the distance between the lens and the projection surface and the moving position of the second driving assembly when the projection ratio of the lens is a maximum projection ratio; a controller connected with the light source, the first driving assembly, the second driving assembly, the distance sensor and the memory; the controller is configured to execute instructions to make the projection device: obtain a first moving position of the first driving assembly in response to a driving action on the first driving assembly, and obtain a target projection ratio corresponding to the first moving position based on the first relationship curve; generate a second relationship curve corresponding to the target projection ratio based on the target projection ratio, the first focusing curve and the second focusing curve, the second relationship curve being a curve of a corresponding relationship between the distance between the lens and the projection surface and the moving position of the second driving assembly under the target projection ratio; obtain a projection distance between the lens and the projection surface detected by the distance sensor; obtaining a second moving position corresponding to the projection distance based on the second relation curve, and controlling the second driving assembly to move to the second moving position to adjust the definition of the projection picture on the projection surface.

10. The projection apparatus according to claim 9, wherein, The controller is further configured to: determine a proportional position of the target projection ratio in a projection ratio interval formed by the minimum projection ratio and the maximum projection ratio; obtain a fifth endpoint of a second relation curve based on the proportional position, a first endpoint of the first focus curve, and a third endpoint of the second focus curve; and / or, obtain a sixth endpoint of a second relation curve based on the proportional position, a second endpoint of the first focus curve, and a fourth endpoint of the second focus curve; generate the second relation curve based on the fifth endpoint and / or the sixth endpoint and the first focus curve or the second focus curve; wherein the first endpoint is a moving position of the second driving assembly when the projection distance between the lens and the projection surface is the minimum projection distance and the projection picture on the projection surface has the maximum definition when the projection ratio of the lens is the minimum projection ratio, and the second endpoint is a moving position of the second driving assembly when the projection distance between the lens and the projection surface is the maximum projection distance and the projection picture on the projection surface has the maximum definition when the projection ratio of the lens is the minimum projection ratio; the third endpoint is a moving position of the second driving assembly when the projection distance between the lens and the projection surface is the minimum projection distance and the projection picture on the projection surface has the maximum definition when the projection ratio of the lens is the maximum projection ratio, and the fourth endpoint is a moving position of the second driving assembly when the projection distance between the lens and the projection surface is the maximum projection distance and the projection picture on the projection surface has the maximum definition when the projection ratio of the lens is the maximum projection ratio.

11. A control method of a projection apparatus, characterized by, The projection device comprises: a lens configured to project a modulated projection light beam to a projection surface; a first driving assembly for driving the lens to change focal length to adjust the size of a projection picture projected by the lens onto the projection surface; a second driving assembly for controlling the focus of the lens to adjust the definition of the projection picture projected by the lens onto the projection surface; a distance sensor configured to detect the distance between the lens and the projection surface. The method comprises: obtaining a first moving position of the first driving assembly in response to a driving action on the first driving assembly, and obtaining a target projection ratio corresponding to the first moving position based on a first relation curve, the first relation curve being a curve of the corresponding relation between the moving position of the first driving assembly and the projection ratio of the lens; generate a second relationship curve corresponding to the target projection ratio based on the target projection ratio and the relationship surface, the second relationship curve being a curve of a corresponding relationship between a distance between the lens and the projection surface and a movement position of the second driving assembly under the target projection ratio, the relationship surface being a surface of a corresponding relationship between the distance between the lens and the projection surface and the movement position of the second driving assembly; obtain a projection distance between the lens and the projection surface detected by the distance sensor; obtain a second movement position corresponding to the projection distance based on the second relationship curve, and control the second driving assembly to move to the second movement position to adjust a definition of a projection picture on the projection surface.

12. A control method of a projection apparatus, characterized by, The projection device comprises: a lens configured to project a modulated projection light beam to a projection surface; a first driving assembly configured to drive the lens to change a focal length to adjust a size of a projection picture projected by the lens to the projection surface; a second driving assembly configured to control focusing of the lens to adjust a definition of a projection picture projected by the lens to the projection surface; a distance sensor configured to detect a distance between the lens and the projection surface. The method comprises: obtain a first movement position of the first driving assembly in response to a driving action of the first driving assembly, and obtain a target projection ratio corresponding to the first movement position based on a first relationship curve, the first relationship curve being a curve of a corresponding relationship between a movement position of the first driving assembly and a projection ratio of the lens; generate a second relationship curve corresponding to the target projection ratio based on the target projection ratio, a first focusing curve and a second focusing curve, the first focusing curve being a curve of a corresponding relationship between a distance between the lens and the projection surface and the movement position of the second driving assembly when the projection ratio of the lens is a minimum projection ratio, the second focusing curve being a curve of a corresponding relationship between the distance between the lens and the projection surface and the movement position of the second driving assembly when the projection ratio of the lens is a maximum projection ratio, the second relationship curve being a curve of a corresponding relationship between the distance between the lens and the projection surface and the movement position of the second driving assembly under the target projection ratio; obtain a projection distance between the lens and the projection surface detected by the distance sensor; obtain a second movement position corresponding to the projection distance based on the second relationship curve, and control the second driving assembly to move to the second movement position to adjust a definition of a projection picture on the projection surface.

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