Projection control method and projection equipment

Abstract

The invention provides a projection control method and projection equipment, and the method comprises the steps: obtaining the distance information of a target object from a distance detection assembly according to a preset frequency, and building a first reference set based on the distance information of the target object obtained when a first projection surface is detected if the distance information of the first projection surface can be detected; considering the characteristic that the micro projection equipment can move at any time, if the micro projection equipment moves, the distance information of the first projection surface cannot be detected, but the distance information of the second projection surface is detected, the projection surface of the micro projection equipment is updated from the first projection surface to the second projection surface. At this time, a second reference set is established based on the distance information of the target object obtained when the second projection surface is detected, and then the projection brightness of the light emitting assembly is adjusted based on the second reference set. Therefore, even if the micro projection equipment moves, the reference can be reestablished when the moving position is detected, and then the projection brightness of the light emitting assembly is adjusted based on the reestablished reference.

Description

Technical Field

[0001] The present invention relates to the technical field of display devices, and in particular to a projection control method and a projection device. Background Art

[0002] The projection device projects the image content or video content corresponding to the video signal onto the screen. When the projection device projects the image content or video content onto the screen, its light emitting component emits a light beam. If the user enters the target area when the projection device is projecting the image content or video content onto the screen, the light beam emitted by the light emitting component will be projected towards the user's eyes. In order to ensure a better projection effect, the brightness of the light beam of the light emitting component will be maintained at a high level. If the light beam is projected towards the user's eyes at this time, it may cause damage to the human eye.

[0003] In the process of projecting image content or video content onto the screen, in order to reduce the probability of the light beam of the light emitting component causing damage to the user's eyes, the projection brightness of the light emitting component can be adjusted according to the detected target object. Specifically, the target area of ​​the projection device is monitored, and when an object is detected in the target area, the working state of the light emitting component is promptly controlled.

[0004] However, in actual applications, micro-projection devices (micro laser projection devices) can be moved at any time due to their portability. After the position is moved, the projection surface of the micro-projection device will change. Given the feature that the micro-projection device can be moved at any time, how to adjust the projection brightness of the light-emitting component of the micro-projection device has become an urgent problem to be solved. Summary of the invention

[0005] The present application provides a projection control method and a projection device to solve the problem of how to adjust the projection brightness of a light emitting component of a micro-projection device based on the characteristic that the position of the micro-projection device can be moved at any time.

[0006] In a first aspect, some embodiments of the present application provide a projection device, including:

[0007] A light emitting component is configured to project projection content onto a projection surface;

[0008] A distance detection component is configured to detect distance information of a target object in a target area, wherein the target object detected by the distance detection component includes at least a projection surface, and the distance information represents a straight-line distance between the target object and the projection device;

[0009] The controller is configured as:

[0010] Acquiring distance information of at least one target object from the distance detection component at a preset frequency;

[0011] When the distance information of the target object obtained from the distance detection component includes the distance information of the first projection surface, a first reference set is established based on the distance information of the target object obtained when the first projection surface is detected, so as to adjust the projection brightness of the light output component according to the first reference set;

[0012] When the distance information of the target object obtained from the distance detection component does not include the distance information of the first projection surface, and the distance information of the target object obtained from the distance detection component includes the distance information of the second projection surface, a second reference set is established based on the distance information of the target object obtained when the second projection surface is detected, so that the projection brightness of the light emitting component is adjusted according to the second reference set instead of adjusting the projection brightness of the light emitting component according to the first reference set.

[0013] In a second aspect, some embodiments of the present application provide a projection control method, which is applied to a projection device, wherein the projection device includes: a light emitting component configured to project projection content onto a projection surface; a distance detection component configured to detect distance information of a target object in a target area, wherein the target object detected by the distance detection component includes at least the projection surface, and the distance information represents a straight-line distance between the target object and the projection device, and the projection control method includes:

[0014] Acquiring distance information of at least one target object from the distance detection component at a preset frequency;

[0015] When the distance information of the target object obtained from the distance detection component includes the distance information of the first projection surface, a first reference set is established based on the distance information of the target object obtained when the first projection surface is detected, so as to adjust the projection brightness of the light output component according to the first reference set;

[0016] When the distance information of the target object obtained from the distance detection component does not include the distance information of the first projection surface, and the distance information of the target object obtained from the distance detection component includes the distance information of the second projection surface, a second reference set is established based on the distance information of the target object obtained when the second projection surface is detected, so that the projection brightness of the light emitting component is adjusted according to the second reference set instead of adjusting the projection brightness of the light emitting component according to the first reference set.

[0017] It can be seen from the above technical solutions that the projection control method and projection device provided in the above embodiments obtain the distance information of at least one target object from the distance detection component at a preset frequency. If the distance information of the target object obtained from the distance detection component includes the distance information of the first projection surface, a first reference set is established based on the distance information of the target object obtained when the first projection surface is detected, so that the projection brightness of the light-emitting component can be adjusted according to the first reference. Considering the movable characteristics of the micro-projection device at any time, if the micro-projection device moves, the distance information of the target object obtained from the distance detection component does not include the distance information of the first projection surface, but includes the distance information of the second projection surface, indicating that the projection surface of the micro-projection device is updated from the first projection surface to the second projection surface. At this time, a second reference set is established based on the distance information of the target object obtained when the second projection surface is detected, and then the projection brightness of the light-emitting component is adjusted based on the second reference set. In this way, even if the micro-projection device moves, the reference can be re-established when the moved position is detected, and then the projection brightness of the light-emitting component is adjusted based on the re-established reference. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the projection state of the projection device in the embodiment of the present application;

[0020] Figure 2 This is a schematic diagram of the structure of a projection device in an embodiment of the present application;

[0021] Figure 3 This is a schematic diagram of the optical-mechanical architecture of a projection device in an embodiment of the present application;

[0022] Figure 4 This is a schematic diagram of the optical path of the projection device in the embodiment of the present application;

[0023] Figure 5 This is a schematic diagram of the system framework of the projection device in the embodiment of the present application;

[0024] Figure 6 This is a schematic diagram of the TOF sensor ranging principle in the embodiment of the present application;

[0025] Figure 7 This is a schematic diagram of the principle of the anti-eye function of the projection device in the embodiment of the present application;

[0026] Figure 8This is a schematic diagram of the principle of the anti-eye function of another projection device in an embodiment of the present application;

[0027] Fig. 9 This is a schematic diagram of the principle of the anti-eye function of another projection device in an embodiment of the present application;

[0028] Fig.10 This is a schematic diagram of the principle of the anti-eye function of another projection device in an embodiment of the present application;

[0029] Fig.11 A schematic diagram of a projection control method process for a projection device provided in an embodiment of the present application;

[0030] Fig.12 A schematic diagram of a projection control method scenario provided in an embodiment of the present application;

[0031] Fig.13 A schematic diagram of another projection control scenario provided in an embodiment of the present application;

[0032] Fig.14 A schematic diagram of another projection control scenario provided in an embodiment of the present application;

[0033] Fig.15 A schematic diagram of another projection control scenario provided in an embodiment of the present application;

[0034] Fig.16 A schematic diagram of another projection control scenario provided in an embodiment of the present application;

[0035] Fig.17 A schematic diagram of another projection control scenario provided in an embodiment of the present application;

[0036] Fig.18 A schematic diagram of another projection control scenario provided in an embodiment of the present application;

[0037] Fig.19 A schematic diagram of a mapping relationship between distance information and first projection brightness provided in an embodiment of the present application;

[0038] Fig. 20 A schematic diagram of another projection control scenario provided in an embodiment of the present application;

[0039] Fig.21 A schematic diagram of a projection control method process for another projection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to make the purpose and implementation method of the present application clearer, the exemplary implementation method of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0041] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0042] The terms "first", "second", "third", etc. in the specification and claims of this application and the above drawings are used to distinguish similar or similar objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise noted. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances.

[0043] The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to all the components expressly listed but may include other components not expressly listed or inherent to such product or device.

[0044] The term "module" refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and / or software code that is capable of performing the functions associated with that element.

[0045] The embodiments of the present application can be applied to various types of projection devices. The following will take a projector as an example to explain the projection device and the automatic focusing method.

[0046] A projector is a device that can project images or videos onto a screen. It can be connected to computers, broadcasting networks, the Internet, VCD (Video Compact Disc), DVD (Digital Versatile Disc Recordable), game consoles, DV, etc. through different interfaces to play corresponding video signals. Projectors are widely used in homes, offices, schools, and entertainment venues.

[0047] Figure 1 The figure shows a schematic diagram of the placement of a projection device according to an embodiment of the present application. Figure 2 A schematic diagram of the optical path of a projection device according to an embodiment of the present application is shown.

[0048] In some embodiments, reference Figure 1-2A projection device provided in the present application includes a projection screen 1 and a projection device 2. The projection screen 1 is fixed at a first position, and the projection device 2 is placed at a second position, so that the image projected by it coincides with the projection screen 1. The projection device includes a laser light source 100, an optical machine 200, a lens 300, and a projection surface 400. Among them, the laser light source 100 provides illumination for the optical machine 200, the optical machine 200 modulates the light source beam, and outputs it to the lens 300 for imaging, and projects it onto the projection surface 400 to form a projection image. Since the laser light source 100, the optical machine 200, and the lens 300 are used together to emit projection light to project a projection image, in some embodiments of the present application, the laser light source 100, the optical machine 200, and the lens 300 are collectively referred to as a light output component.

[0049] In some embodiments, the laser light source 100 of the projection device includes a laser assembly and an optical lens assembly, and the light beam emitted by the laser assembly can pass through the optical lens assembly to provide lighting for the optical machine. For example, the optical lens assembly requires a higher level of environmental cleanliness and airtightness; while the chamber in which the laser assembly is installed can be sealed with a lower level of dustproofness to reduce the sealing cost.

[0050] In some embodiments, the optical engine 200 of the projection device may be implemented as a blue optical engine, a green optical engine, a red optical engine, and may also include a heat dissipation system, a circuit control system, etc. It should be noted that in some embodiments, the light emitting component of the projector may also be implemented by an LED light source.

[0051] Figure 3 A schematic diagram of the circuit architecture of a projection device according to an embodiment of the present application is shown. In some embodiments, the projection device may include a display control circuit 10, a laser light source 20, at least one laser driving component 30, and at least one brightness sensor 40. The laser light source 20 may include at least one laser corresponding to the at least one laser driving component 30. The at least one refers to one or more, and the multiple refers to two or more.

[0052] Based on the circuit architecture, the projection device can achieve adaptive adjustment. For example, by setting a brightness sensor 40 in the light output path of the laser light source 20, the brightness sensor 40 can detect a first brightness value of the laser light source and send the first brightness value to the display control circuit 10.

[0053] The display control circuit 10 can obtain the second brightness value corresponding to the driving current of each laser, and when it is determined that the difference between the second brightness value of the laser and the first brightness value of the laser is greater than the difference threshold, it is determined that a COD fault occurs in the laser; the display control circuit can adjust the current control signal of the laser driving component corresponding to the laser until the difference is less than or equal to the difference threshold, thereby eliminating the COD fault of the blue laser; the projection device can eliminate the COD fault of the laser in time, reduce the damage rate of the laser, and improve the image display effect of the projection device.

[0054] Figure 4 A schematic structural diagram of a projection device according to an embodiment of the present application is shown.

[0055] In some embodiments, the laser light source 20 in the projection device may include independently arranged blue laser 201, red laser 202 and green laser 203. The projection device may also be called a three-color projection device. The blue laser 201, the red laser 202 and the green laser 203 are all modular lightweight (Mirai Console Loader, MCL) packaged lasers, which are small in size and conducive to the compact arrangement of the optical path.

[0056] In some embodiments, the controller includes at least one of a central processing unit (CPU), a video processor, an audio processor, a graphics processing unit (GPU), a RAM Random Access Memory (RAM), a ROM (Read-Only Memory, ROM), a first interface to an nth interface for input / output, a communication bus (Bus), etc.

[0057] In some embodiments, the projection device may be configured with a camera for cooperating with the projection device to achieve adjustment and control of the projection process. For example, the camera configured with the projection device may be specifically implemented as a 3D camera or a binocular camera; when the camera is implemented as a binocular camera, it specifically includes a left camera and a right camera; the binocular camera may obtain the image and playback content presented by the screen corresponding to the projection device, that is, the projection surface, and the image or playback content is projected by the built-in optical machine of the projection device.

[0058] When the projection device moves, its projection angle and distance to the projection surface change, which will cause the projected image to deform. The projected image will appear as a trapezoidal image or other deformed image. The projection device controller can achieve automatic trapezoidal correction based on the image taken by the camera by coupling the angle between the optical and mechanical projection surfaces and the correct display of the projection image.

[0059] Figure 5A schematic diagram of a system framework for realizing display control of a projection device according to an embodiment of the present application is shown.

[0060] In some embodiments, the projection device has the characteristics of a telephoto micro-projector, and its controller can control the display of the projection light image through a preset algorithm to achieve functions such as automatic trapezoidal correction of the display screen, automatic screen entry, automatic obstacle avoidance, automatic focusing, and anti-eye-shooting.

[0061] In some embodiments, the projection device is configured with a gyroscope sensor; when the device is moving, the gyroscope sensor can sense the position movement and actively collect movement data; the collected data is then sent to the application service layer through the system framework layer to support the application data required during user interface interaction and application interaction. The collected data can also be used for data calls by the controller in the algorithm service implementation.

[0062] In some embodiments, the projection device is configured with a time-of-flight sensor. After the time-of-flight sensor collects corresponding data, the data will be sent to the corresponding time-of-flight service of the service layer; after the above-mentioned time-of-flight service obtains the data, it will send the collected data to the application service layer through the process communication framework, and the data will be used for interactive use such as controller data calls, user interfaces, and program applications.

[0063] In some embodiments, the projection device is configured with a camera for capturing images, and the camera can be implemented as a binocular camera, a depth camera, a 3D camera, etc.; the camera capture data will be sent to the camera service, and then the camera service will send the captured image data to the process communication framework, and / or the projection device correction service; the projection device correction service can receive the camera capture data sent by the camera service, and the controller can call the corresponding control algorithm in the algorithm library according to the different functions to be implemented.

[0064] In some embodiments, data is interacted with the application service through a process communication framework, and then the calculation results are fed back to the correction service through the process communication framework; the correction service sends the obtained calculation results to the projection device operating system to generate control signals, and sends the control signals to the light emitting component control driver to control the working condition of the light emitting component and realize automatic correction of the displayed image.

[0065] In some embodiments, the projection device uses an automatic focusing algorithm and its configured laser ranging to obtain the current object distance to calculate the initial focal length and the search range; then the projection device drives the camera to take pictures and uses the corresponding algorithm to evaluate the clarity.

[0066] In some embodiments, in order to protect the user's eyesight during the projection process, the projection device also includes a distance detection component. The distance detection component is used to detect whether there is a target object in the target area and measure the distance information of the target object, and the distance information represents the straight-line distance between the target object and the projection device. The target area can be the projection area of ​​the projection device. After the light output component of the projection device is turned on, the light beam emitted by the light output component is in a conical barrel shape. If the user is in front of the projection device, these conical barrel-shaped light beams may cause damage to the human eye. Therefore, the target area can be the coverage area of ​​the conical barrel-shaped light beam. The range of the target area can also be larger than the range of the projection area.

[0067] In the embodiment of the present application, during the reference establishment phase (before the light emitting component starts to project the projection content onto the projection surface), the situation where a human target enters the target area is not considered. Therefore, before the light emitting component starts to project the projection content onto the projection surface, the target objects detected by the distance detection component only include non-human targets (hereinafter referred to as obstacles). After the light emitting component projects the projection content onto the projection surface, the obstacles detected during the reference establishment phase are assumed to be immobile by default. In addition, the embodiment of the present application is to detect whether a person enters the target area when the light emitting component projects the projection content onto the projection surface. Therefore, after the light emitting component starts to project the projection content onto the projection surface, the target objects detected by the distance detection component only include human targets, and the situation where the target object detected by the distance detection component is a newly added obstacle is not considered after the light emitting component starts to project the projection content onto the projection surface. Therefore, after the light emitting component starts to project the projection content onto the projection surface, if the distance detection component detects a target object, the target object is determined to be a human target, and the projection brightness of the light emitting component is controlled according to the determination result.

[0068] In the process of target object recognition, it is necessary to use various processors of the projection device to perform the calculation process. Processors include but are not limited to NPU (Neural network Processing Unit), GPU (Graphics Processing Unit), and CPU (Central Processing Unit). Among them, the projection device is usually equipped with a CPU, which is used to control the operation of related components of the projection device and adjust the projection device according to actual working conditions. However, due to the high computing power requirements of human target recognition, the human target recognition strategy is deployed in the CPU, and the efficiency of obtaining detection results is not high, and it occupies control resources, which is easy to affect the normal operation of the projection device.

[0069] The distance detection component of the embodiment of the present application may adopt a radar distance measurement component, a TOF (Time of flight) sensor, etc. Among them, the TOF sensor may be an infrared TOF sensor or a laser TOF sensor. The TOF sensor may use a tiny transmitter to emit infrared light or laser, wherein the generated light will bounce off any object and return to the sensor. Based on the time difference between the reflection of the light and the time it returns to the sensor after being reflected by the object, the sensor can measure the distance between the object and the sensor. Figure 6 The TOF sensor distance measurement schematic diagram shown in Figure 6 In the figure, A is the infrared light transmitter in the TOF sensor, B is the infrared light receiver in the TOF sensor, and C is the object to be measured. First, the transmitter A emits infrared light and starts timing. The infrared light is reflected after encountering the object to be measured C, and then the reflected infrared light is received by B and the time is recorded. In this way, the flight time of the infrared light is measured. Since the speed of infrared light is known to be constant, the distance between the TOF sensor and the object to be measured can be calculated by the following formula = (speed of light × flight time) / 2.

[0070] If the distance detection component uses a TOF sensor, the data format obtained by the controller from the TOF sensor is as shown in the following code:

[0071] {"ret":0,"obj":"2","st0":"0","dis0":"749",

[0072] "st1":"0","dis1":"1573"

[0073] "st2": "255", "dis2": "-1",

[0074] "st3":"255","dis3":"-1"}

[0075] Among them, "ret" means the address pointed to by the return instruction; "obj" means the number of target objects whose distance is currently measured; "stX" means the confidence of the distance information of each target object (confidence means reliability, 0 means the current distance information is available, 255 means the distance information is not measured, and data of other confidence levels are all unavailable distance information); "disX" means the distance information measured for each target object.

[0076] In practical applications, the TOF sensor can be an array, through which the distance between the entire surface of the object being measured and the TOF sensor can be measured. The TOF sensor can be installed on the projection device to detect the distance between the target object and the projection device. In order to facilitate the explanation of the scheme, the embodiment of the present application abstracts the target object and the projection device into an abstract point, and the distance information of the target object is the straight-line distance between the abstract point of the target object and the abstract point of the projection device.

[0077] like Figure 7 The schematic diagram of the principle of the anti-radiation eye function of the projection device shown (the top view of the projection scene), when the human target does not enter the target area, the distance detection component measures the distance between the projection device and the projection surface as 2m, and the internal algorithm can use this distance as the reference distance information. After the human target enters the target area, the distance detection component detects a new distance (the distance between the human target and the projection device), for example, the new distance detected at this time is 1m, and the distance value changes to 1m compared with the reference distance information, and the distance change value is greater than the distance change threshold set in the algorithm (there is an error in the distance measurement of the distance detection component. If the distance change value is only 0.01m, it is very likely that the distance change is caused by the measurement error. Setting the distance change threshold can reduce the false triggering of the anti-radiation eye function caused by the measurement error), so it is judged that the human target enters the target area, triggers the anti-radiation eye function, that is, adjusts the projection brightness of the light-emitting component of the projection device. In the embodiment of the present application, the farthest distance detected by the distance detection component is used as the reference distance information by default, and the farthest distance that the distance detection component can detect is usually the distance from the projection surface to the projection device (therefore, the distance of the object behind the projection surface is not considered), and the farthest distance is the distance that can be detected stably and sustainably.

[0078] In the benchmark establishment phase, if there is an obstacle between the projection device and the projection surface, then in the projection phase of the light output component, there are three situations in which the anti-shooting eye function is triggered:

[0079] The first case (such as Figure 8 As shown), the obstacle is not within the detection range of the distance detection component. At this time, the distance detection component can only detect the projection surface but not the obstacle. If a human target enters the target area, the anti-shooting eye function can be triggered normally.

[0080] The second case (such as Fig. 9 As shown), the obstacle is within the detection range of the distance detection component. At this time, the distance detection component can detect the projection surface and the obstacle. If the distance value of the obstacle is unstable due to factors such as the hardware performance of the distance detection component or the reflectivity of the object, the farther distance will still be used as the reference distance.

[0081] For example, the TOF sensor emits infrared light once every 100ms. The TOF sensor can emit infrared light 10 times within 1s, but only receives one returned infrared light. At this time, it can be determined that the distance value of the detected obstacle is unstable. After taking the 2m distance of the projection surface as the reference distance, the existence of obstacles can still be detected. Therefore, even if no human target enters the target area, the anti-shooting eye function will be triggered, resulting in false triggering of the anti-shooting eye function.

[0082] The third case (such as Fig.10 As shown in the figure, the obstacle is within the detection range of the distance detection component and a stable distance value can be detected. At this time, the distance of the closer obstacle is used as the reference distance. After the reference distance is established, the light-emitting component projects the projection content onto the projection surface. At this time, if the human target enters the target area between the obstacle and the projection surface (for example Fig.10 In this case, the distance between the human target and the projection device is greater than the reference distance, so the anti-shooting eye function will not be triggered. If the human target enters the target area between the projection device and the obstacle (for example Fig.10 In the figure, the distance between the human target and the projection device is less than the reference distance, so the anti-shooting eye function will be triggered normally.

[0083] It can be seen from the above three situations that during the benchmark establishment stage, if there are obstacles in the target area, the anti-shooting eye function may be triggered incorrectly, or, during the projection stage of the light-emitting component, if a human target enters the target area, the anti-shooting eye function may not be triggered normally.

[0084] In view of the above problems, the present application provides some embodiments of a projection device, including a light emitting component, a distance detection component and a controller. The light emitting component is configured to project projection content onto a projection surface. The distance detection component is configured to detect distance information of a target object in a target area. Fig.11 As shown, the controller is configured to execute a projection control method, including the following contents:

[0085] Step S201: acquiring distance information of at least one target object from the distance detection component at a preset frequency, and generating a first distance information set according to the distance information of at least one target object.

[0086] The startup instruction includes an instruction for starting the projection device input by the user through a remote control, voice command, control panel, gesture, etc. After the projection device is powered on, it is in a waiting state. In the waiting state, the controller of the projection device can receive the startup instruction input by the user, and execute the startup process after receiving the startup instruction. After the controller receives the startup instruction input by the user, in response to the startup instruction, it controls the distance detection component to start detecting the distance information of the target object in the target area. Among them, the projection control method process executed by the controller of the embodiment of the present application is divided into: establishing a reference stage and a projection stage. In the establishment of the reference stage, the distance detection component establishes a reference distance based on the detected distance information, and uses the established reference distance for the process of determining whether a human target enters the target area in the projection stage.

[0087] The duration of the benchmark establishment phase can be set, for example, the duration of the benchmark establishment phase can be set to 5S, that is, the benchmark establishment phase is within 5S after the projection device is started, wherein the benchmark establishment phase defaults to no human target entering the target area (that is, the target object detected in the benchmark establishment phase will not disappear from the target area after the benchmark establishment phase, and the location of the target object, if detected again in the projection phase, will still be the target object, not the human target). In the benchmark establishment phase, the light output component is not turned on, so that the entire projection device is equivalent to being in the process of creating a judgment benchmark within the 5S period after startup, and does not project content onto the projection surface.

[0088] In some embodiments, during the benchmark establishment phase, the distance detection component may detect the distance information of the target object in the target area at a preset frequency. Therefore, based on the distance detection component detecting the distance information of the target object in the target area at a preset frequency, the controller may also obtain the distance information of at least one target object from the distance detection component at the preset frequency, and then periodically record the distance information at the preset frequency, and generate a first distance information set based on the recorded distance information.

[0089] For example, in the benchmark establishment phase, if the TOF sensor sends infrared light or laser to the target area every 100 ms, it generates a distance information signal after receiving the infrared light or laser reflected by the target object. The TOF sensor can report the distance information signal to the controller every 100 ms, that is, the controller can also obtain the distance information from the TOF sensor at a frequency of 100 ms, and record the distance information after receiving the distance information, and generate a first distance information set.

[0090] Even if the distance information of target object A is detected in the previous 100ms cycle, due to the influence of TOF hardware performance or the reflectivity of the object surface, when the distance information of target object A is not detected in the current 100ms cycle, the distance information of target object A can still be recorded. In other words, regardless of whether the distance information of the obstacle can be stably detected during the benchmark establishment phase, it will be recorded and added to the first distance information set, thereby ensuring that all obstacles in the target area can be recorded during the benchmark establishment phase, improving the accuracy of obstacle detection and the accuracy of triggering the anti-shooting eye function.

[0091] It should be noted that the target object that can be detected by the distance detection component in the embodiment of the present application is a projection surface, wherein the projection surface is in the shape of a rectangular parallelepiped, and the distance between the projection surface and the projection device detected by the distance detection component is actually the straight-line distance between the projection device and the center point of the projection surface. Therefore, in the stage of establishing a reference, the controller can obtain the distance information of at least one target object from the distance detection component, that is, the distance information of the projection surface. That is, the first distance information set at least includes the distance information of the projection surface. If there are other obstacles in the target area, the controller can also obtain the distance information of other obstacles from the distance detection component, and the first distance information set may also include the distance information of other obstacles.

[0092] For example, Fig.12 As shown in the scene diagram shown, in the benchmark establishment stage, if there are no other obstacles in the target area except the projection surface, the distance detection component can only detect the projection surface, and the controller can only obtain the distance information of the projection surface from the distance detection component. The first distance information set generated can be {2m}, where 2m is the straight-line distance between the projection surface and the projection device. Fig.13 As shown in the scene diagram shown, in the benchmark establishment stage, if there is an obstacle Z in addition to the projection surface in the target area, the distance detection component can detect not only the projection surface but also the obstacle Z. The controller can obtain the distance information of the projection surface and the distance information of the obstacle Z from the distance detection component, and the generated first distance information set can be {2m, 0.5m}, where 0.5m is the straight-line distance between the obstacle and the projection device.

[0093] Step S202, controlling the light emitting component to turn on, and in the process of the light emitting component projecting the projection content onto the projection surface, obtaining the distance information of at least one target object from the distance detection component again, and generating a second distance information set according to the distance information of at least one target object obtained again;

[0094] Step S203, if the number of distance information in the second distance information set is greater than the number of distance information in the first distance information set, controlling the light emitting component to reduce projection brightness;

[0095] Step S204: if the number of distance information in the second distance information set is equal to the number of distance information in the first distance information set, the light emitting component is not controlled to reduce the projection brightness.

[0096] Step S201 is the benchmark establishment stage, and steps S202 to S203 are the projection stage, that is, during the process of the light-emitting component projecting the projection content onto the projection surface, it is necessary to determine whether a human target has entered the target area. In this stage, the light-emitting component is turned on, so if a human target is detected entering the target area, the projection brightness of the light-emitting component needs to be reduced to prevent the light beam of the light-emitting component from being too bright and causing damage to the human eye. In this stage, if no human target is detected entering the target area, there is no need to reduce the projection brightness of the light-emitting component.

[0097] During the projection phase, when the light emitting component projects the projection content onto the projection surface, the controller again obtains the distance information of at least one target object from the distance detection component, and then generates a second distance information set based on the distance information of at least one target object obtained again. During the projection phase, the distance detection component may also detect the distance information of the target object in the target area at a preset frequency. Based on the distance detection component detecting the distance information of the target object in the target area at a preset frequency, the controller may also obtain the distance information of at least one target object from the distance detection component again at the preset frequency, and then periodically record the distance information at the preset frequency, and generate a second distance information set based on the recorded distance information.

[0098] For example, during the projection stage, the TOF sensor can also send infrared light or laser to the target area every 100ms. After receiving the infrared light or laser reflected by the target object, it generates a distance information signal. The TOF sensor can report the distance information signal to the controller every 100ms, which means that the controller can also obtain distance information from the TOF sensor at a frequency of 100ms.

[0099] Unlike the reference establishment phase, in the projection phase, the projection brightness of the light-emitting component needs to be adjusted in a timely manner according to the detected distance information to timely reduce the damage of the light beam to the human eye. Therefore, in the projection phase, the duration of a single projection phase can be set. For example, the total duration of the reference establishment phase is 5s, so the first distance information set is actually an information set generated based on 50 distance information signals. The duration of the projection phase can be set to 2s, so the second distance information set is actually an information set generated based on 20 distance information signals.

[0100] In the projection stage, the target object that the distance detection component can also detect is the projection surface. Therefore, in the projection stage, the controller can obtain the distance information of at least one target object from the distance detection component, that is, the distance information of the projection surface. That is, the second distance information set at least includes the distance information of the projection surface. If there are other obstacles in the target area at this time, the controller can also obtain the distance information of other obstacles from the distance detection component, and the second distance information set can also include the distance information of other obstacles. Among them, if the number of distance information in the second distance information set is greater than the number of distance information in the first distance information set, it means that there is a human target entering the target area at present, so it is necessary to control the light emitting component to reduce the projection brightness, so as to reduce the damage of the light beam of the light emitting component to the human eye; if the number of distance information in the second distance information set is equal to the number of distance information in the first distance information set, it means that there is no human target entering the target area at present, so it is not necessary to control the light emitting component to reduce the projection brightness.

[0101] For example, Fig.12 As shown in the scene diagram shown, in the benchmark establishment stage, the first distance information set generated is {2m}, where 2m is the straight-line distance between the projection surface and the projection device. If the second distance information set generated in the projection stage is still {2m}, by comparing the second distance information set with the first distance information set, it can be determined that the number of distance information in the second distance information set is equal to the number of distance information in the first distance information set, indicating that no human target enters the target area in the projection stage, so there is no need to control the light-emitting component to reduce the projection brightness.

[0102] like Fig.12 As shown in the scene diagram, in the projection stage, if human target A enters the target area, and the distance information between human target A and the projection device is detected to be 1m, the second distance information set generated in the projection stage is {2m, 1m}. After comparing the second distance information set {2m, 1m} with the first distance information set {2m}, it can be determined that the number of distance information in the second distance information set is greater than the number of distance information in the first distance information set. Therefore, it can be determined that there is a human target entering the target area in the projection stage, so it is necessary to control the light-emitting component to reduce the projection brightness.

[0103] like Fig.13As shown in the scene diagram, in the benchmark establishment stage, if there is an obstacle Z in the target area in addition to the projection surface, the distance detection component can detect not only the projection surface but also the obstacle Z, and the generated first distance information set is {2m, 0.5m}, where 0.5m is the distance information between the obstacle Z and the projection device. If the second distance information set generated in the projection stage is still {2m, 0.5m}, the second distance information set is compared with the first distance information set to determine that the number of distance information in the second distance information set is equal to the number of distance information in the first distance information set, indicating that no human target enters the target area in the projection stage, so there is no need to control the light-emitting component to reduce the projection brightness.

[0104] like Fig.13 As shown in the scene diagram, in the projection stage, if human target A enters the target area, and the distance information between human target A and the projection device is detected to be 1m, the second distance information set generated in the projection stage is {2m, 0.5m, 1m}. After comparing the second distance information set {2m, 0.5m, 1m} with the first distance information set {2m, 0.5m}, it can be determined that the number of distance information in the second distance information set is greater than the number of distance information in the first distance information set. Therefore, it can be determined that there is a human target entering the target area in the projection stage, so it is necessary to control the light-emitting component to reduce the projection brightness.

[0105] It should be noted that in the solution of the embodiment of the present application, in the baseline establishment stage, it is assumed that all target objects detected in the target area are non-human targets. Therefore, the situation where these non-human targets are removed is not considered in the projection stage. Therefore, there is no situation where the number of distance information in the second distance information set is less than the number of distance information in the first distance information set.

[0106] In some embodiments, since the light beam projected by the light emitting component to the target area is in the shape of a cone barrel, two identical distance information may appear in the second distance information set. However, since the present application uses the increase in the number of distance information as the basis for judging whether there is a human target entering the target area, even if two identical distance information appear in the second distance information set, if the number of distance information in the second distance information set is greater than the number of distance information in the first distance information set, it is possible to accurately judge whether there is a human target entering the target area, thereby accurately adjusting the projection brightness of the light emitting component.

[0107] For example, Fig.14As shown in the scene diagram shown, in the benchmark establishment stage, if there is an obstacle Z in the target area in addition to the projection surface, the distance detection component can detect not only the projection surface but also the obstacle Z, and the generated first distance information set is {2m, 0.5m}. In the projection stage, if a human target A enters the target area, and the distance information between the human target A and the projection device is detected to be 0.5m, the second distance information set generated in the projection stage is {2m, 0.5m, 0.5m}. After comparing the second distance information set {2m, 0.5m, 0.5m} with the first distance information set {2m, 0.5m}, it can be determined that the number of distance information in the second distance information set is greater than the number of distance information in the first distance information set. Therefore, it can still be determined that there is a human target entering the target area in the projection stage, so it is necessary to control the light-emitting component to reduce the projection brightness.

[0108] It can be seen from the above technical solution that in the projection control method provided by the above embodiment, if the user inputs a startup command to start the projection device, the controller of the projection device responds to start establishing a reference phase: controlling the distance detection component to detect the distance information of the target object in the target area, obtaining the distance information of at least one target object from the distance detection component, and generating a first distance information set based on the distance information of at least one target object.

[0109] Then turn on the light emitting component and enter the light emitting component projection phase: in the process of the light emitting component projecting the projection content to the projection surface, the distance information of at least one target object is obtained again from the distance detection component, and a second distance information set is generated based on the distance information of at least one target object obtained again.

[0110] If the number of distance information in the second distance information set is greater than the number of distance information in the first distance information set, it indicates that a human target has entered the target area, and the light-emitting component is controlled to reduce the projection brightness. If the number of distance information in the second distance information set is equal to the number of distance information in the first distance information set, it indicates that no human target has entered the target area, and the light-emitting component is not controlled to reduce the projection brightness. In this way, even if there are non-human targets, that is, obstacles in the target area during the benchmark establishment stage, the anti-shooting eye function will not be triggered. In the projection stage, it is also possible to accurately determine whether a human target has entered the target area, thereby accurately determining whether the anti-shooting eye function is triggered.

[0111] In some embodiments, the farthest distance between the projection surface and the projection device is determined as a limit distance, and the second distance information set is generated according to distance information whose value is less than or equal to the value of the limit distance.

[0112] For example, in the benchmark establishment phase, it is detected that the distance between the projection surface and the projection device is 2m, and the distance between the projection surface and the projection device is the farthest distance, and 2m is determined as the limit distance, so 2m is the maximum distance that the current distance detection component can detect. The target area can be a fan-shaped area with the projection device as the center and a radius of 2m. Then in the projection stage of the light output component, due to the error in the detection range of the equipment, the distance detection component may detect obstacles or human targets exceeding 2m, which will mistakenly trigger the anti-radiation eye function. Therefore, at this time, the distance information with a value exceeding 2m may not be added to the second distance information set, so that if the target area does not detect a human target at this time, even if a human target is detected outside the target area, the number of distance information in the second distance information set is still equal to the number of distance information in the first distance information set, thereby avoiding the false triggering of the radiation eye function.

[0113] In some embodiments, if the number of distance information in the second distance information set is greater than the number of distance information in the first distance information set, and the value of the newly added distance information in the second distance information set is less than the safety distance threshold, the light emitting component is controlled to be turned off; if the number of distance information in the second distance information set is greater than the number of distance information in the first distance information set, and the value of the newly added distance information in the second distance information set is greater than or equal to the safety distance threshold, the light emitting component is controlled to reduce the projection brightness while keeping the light emitting component turned on.

[0114] For example, in the benchmark establishment phase, the first distance information set generated is {2m}, where 2m is the straight-line distance between the projection surface and the projection device. In the projection phase, if human target A enters the target area, and the distance information between human target A and the projection device is detected to be 1m, the second distance information set generated in the projection phase is {2m, 1m}. Compared with the first distance information set, the value of the newly added distance information is 1m. If the safety distance threshold is 1.5m, and the distance between human target A and the projection device is 1m at this time, the distance between human target A and the projection device is less than the safety distance threshold, indicating that the distance between human target A and the projection device is too close. Even if the projection brightness of the light-emitting component is reduced, it will cause damage to the human eye. Therefore, the light-emitting component can be controlled to be turned off. In this way, when it is detected that the human eye is too close to the projection device, the light-emitting component can be directly turned off to prevent the light-emitting component from causing damage to the human eye.

[0115] In the benchmark establishment stage, the first distance information set generated is {2m}, where 2m is the straight-line distance between the projection surface and the projection device. In the projection stage, if human target A enters the target area, and the distance information between human target A and the projection device is detected to be 1.8m, the second distance information set generated in the projection stage is {2m, 1.8m}. Compared with the first distance information set, the value of the newly added distance information is 1.8m. If the safety distance threshold is 1.5m, and the distance between human target A and the projection device is 1.8m at this time, the distance between human target A and the projection device is greater than the safety distance threshold, indicating that the distance between human target A and the projection device is not too close, and the damage of the light beam to the human eye can be reduced by reducing the projection brightness of the light emitting component. Therefore, the light emitting component can be controlled to reduce the projection brightness.

[0116] In some embodiments, after controlling the light emitting component to reduce the projection brightness, the distance information of at least one target object can be acquired again from the distance detection component, and a third distance information set can be generated based on the distance information of at least one target object acquired again. If the number of distance information in the third distance information set is equal to the number of distance information in the first distance information set, the light emitting component is controlled to increase the projection brightness.

[0117] For example, in the benchmark establishment phase, the first distance information set generated is {2m}, where 2m is the straight-line distance between the projection surface and the projection device. In the projection phase, if human target A enters the target area, and the distance information between human target A and the projection device is detected to be 1m, the second distance information set generated in the projection phase is {2m, 1m}. After comparing the second distance information set {2m, 1m} with the first distance information set {2m}, it can be determined that the number of distance information in the second distance information set is greater than the number of distance information in the first distance information set. Therefore, it can be determined that there is a human target entering the target area in the projection phase, so it is necessary to control the light-emitting component to reduce the projection brightness.

[0118] After controlling the light emitting component to reduce the projection brightness, the controller again obtains the distance information of at least one target object from the distance detection component, and then generates a third distance information set based on the distance information of at least one target object obtained again. If the third distance information set is still {2m, 1m}, after comparing the third distance information set with the first distance information set {2m}, it can be determined that the number of distance information in the third distance information set is still greater than the number of distance information in the first distance information set, so it can be determined that the human target A is still located in the target area, and therefore the projection brightness of the light emitting component is maintained at the reduced projection brightness.

[0119] like Fig.15In the scene diagram shown, if the third distance information set is {2m, 1m, 0.9m}, after comparing the third distance information set with the first distance information set {2m}, it can be determined that the number of distance information in the third distance information set is still greater than the number of distance information in the first distance information set, so it can be determined that human target A is still in the target area, and there is a new human target B entering the target area, so the projection brightness of the light emitting component is maintained at the reduced projection brightness. Fig.16 As shown, if the third distance information set is {2m}, after comparing the third distance information set with the first distance information set {2m}, it can be determined that the number of distance information in the third distance information set changes to be equal to the number of distance information in the first distance information set. Therefore, it can be judged that the human target A has left the target area, and at this time, the light-emitting component can be controlled to increase the projection brightness.

[0120] In the benchmark establishment stage, if there is an obstacle Z in the target area in addition to the projection surface, the first distance information set is {2m, 0.5m}. In the projection stage, if a human target A enters the target area, the generated second distance information set is {2m, 0.5m, 1m}. After comparing the second distance information set {2m, 0.5m, 1m} with the first distance information set {2m, 0.5m}, it can be determined that the number of distance information in the second distance information set is greater than the number of distance information in the first distance information set. Therefore, it can still be determined that there is a human target entering the target area in the projection stage, so it is necessary to control the light-emitting component to reduce the projection brightness.

[0121] After controlling the light emitting component to reduce the projection brightness, the controller obtains the distance information of at least one target object from the distance detection component again, and then generates a third distance information set based on the distance information of at least one target object obtained again. If the third distance information set is still {2m, 0.5m, 1m}, after comparing the third distance information set with the first distance information set {2m, 0.5m}, it can be determined that the number of distance information in the third distance information set is still greater than the number of distance information in the first distance information set, and the projection brightness of the light emitting component is maintained at the reduced projection brightness.

[0122] like Fig.17 As shown in the scene diagram, if the third distance information set is {2m, 0.5m, 1m, 1m}, after comparing the third distance information set with the first distance information set {2m, 0.5m}, it can be determined that the number of distance information in the third distance information set is still greater than the number of distance information in the first distance information set, so it can be determined that the human target A is still in the target area, and there is a new human target B entering the target area, so the projection brightness of the light-emitting component is maintained at the reduced projection brightness. Fig.18As shown in the scene diagram, if the third distance information set is {2m, 0.5m}, after comparing the third distance information set with the first distance information set {2m, 0.5m}, it can be determined that the number of distance information in the third distance information set changes to be equal to the number of distance information in the first distance information set. Therefore, it can be judged that the human target A has left the target area, and the light-emitting component can be controlled to increase the projection brightness.

[0123] In some embodiments, if there is new distance information in the second distance information set compared to the distance information in the first distance information set, when controlling the light-emitting component to reduce the projection brightness, the first projection brightness can be searched based on the new distance information in the second distance information set, and the projection brightness of the light-emitting component can be controlled to be reduced from the current projection brightness to the first projection brightness, wherein there is a mapping relationship between the new distance information in the second distance information set and the first projection brightness.

[0124] For example, Fig.19 The mapping relationship diagram between the distance information and the first projection brightness shown in the figure, if the newly added distance information is 1.9m, that is, the distance between the human target and the projection device is detected to be 1.9m, then the first projection brightness is brightness A, if the newly added distance information is 1.8m, that is, the distance between the human target and the projection device is detected to be 1.8m, then the first projection brightness is brightness B, if the newly added distance information is 1.7m, that is, the distance between the human target and the projection device is detected to be 1.7m, then the first projection brightness is brightness C... Among them, brightness A, brightness B, brightness C... gradually decrease in order of arrangement, and the brightness values ​​of brightness A, brightness B, brightness C... are all less than the brightness before reducing the projection brightness. That is to say, if the distance between the human target and the projection device is detected to be 1.9m, the projection brightness of the light-emitting component is reduced from the current brightness to brightness A, if the distance between the human target and the projection device is detected to be 1.8m, then the projection brightness of the light-emitting component is reduced from the current brightness to brightness B, if the distance between the human target and the projection device is detected to be 1.7m, then the projection brightness of the light-emitting component is reduced from the current brightness to brightness C... This can balance the relationship between protecting human eyes and screen brightness. In practical applications, the brightness can be adjusted with higher precision, for example, the corresponding brightness value can be determined with an accuracy of every 0.05m, so that the brightness of the light beam emitted by the light emitting component is more suitable for human eyes.

[0125] The process of establishing the reference distance in the above embodiments is performed after starting the projection device. In some embodiments, the reference distance can also be established before starting the projection device, that is, the process of establishing the reference distance is separated from the projection process of the projection device (the process of establishing the reference distance only needs to be applied to the distance detection component. In this embodiment, the distance detection component can have its own processor, and the processor of the distance detection component processes the distance information, so that the reference distance can be established before the projection device is started).

[0126] The above embodiment can also be applied to micro-projection devices. In practical applications, micro-projection devices (micro laser projection devices) can be moved at any time due to their portability. After the position is moved, the projection surface of the micro-projection device will change. In view of the fact that the micro-projection device can be moved at any time, how to adjust the projection brightness of the light-emitting component of the micro-projection device has become an urgent problem to be solved.

[0127] For example, Fig. 20 In the scene diagram shown, the projection device is at the initial position a, and the projection surface is the first projection surface. If the projection device moves to position b or position c, the projection surface will be changed to the second projection surface or the third projection surface. The projection range of the light emitting component and the detection range of the distance detection component will both change. Therefore, it is necessary to re-establish the benchmark and readjust the projection brightness according to the position after the movement.

[0128] In view of the above problems to be solved, if the projection device changes position frequently, the reference distance can be re-established each time the position is changed, that is, the last established reference distance is deleted each time the position is changed, and the currently established reference distance is recorded as the detection reference for the projection stage. The specific steps are as follows: Fig.21 As shown:

[0129] Step S100, obtaining distance information of at least one target object from the distance detection component according to a preset frequency;

[0130] Step S200, when the distance information of the target object obtained from the distance detection component includes the distance information of the first projection surface, a first reference set is established based on the distance information of the target object obtained when the first projection surface is detected, so as to adjust the projection brightness of the light output component according to the first reference set;

[0131] Step S300: If the distance information of the target object acquired from the distance detection component still includes the distance information of the first projection surface, the projection brightness of the light emitting component is still adjusted based on the first reference set.

[0132] Step S400, when the distance information of the target object obtained from the distance detection component does not include the distance information of the first projection surface, and the distance information of the target object obtained from the distance detection component includes the distance information of the second projection surface, a second reference set is established based on the distance information of the target object obtained when the second projection surface is detected, so that the projection brightness of the light emitting component is adjusted according to the second reference set instead of adjusting the projection brightness of the light emitting component according to the first reference set.

[0133] For example, Fig. 20 In the scene diagram shown, the projection device is at the initial position a, the projection surface is the first projection surface, and there is no obstacle in the projection range, so the first reference set is {Xa}, where Xa is the distance between the first projection surface and the projection device. Then the projection device moves from the initial position a to position b, the projection surface is the second projection surface, and there is an obstacle A in the projection range, so the second reference set is {Xb, XA}, where Xb is the distance between the second projection surface and the projection device, and XA is the distance between obstacle A and the projection device. Then the projection device moves from position b to position c, the projection surface is the third projection surface, and there is an obstacle B in the projection range, so the third reference set is {Xc, XB}, where Xc is the distance between the second projection surface and the projection device, and XB is the distance between obstacle B and the projection device.

[0134] When the projection device is at position a, the projection brightness of the light emitting component can be adjusted based on the first reference set. For example, when the projection device is always at position a, the first distance information set is obtained from the distance detection component at a preset frequency, and then the distance information in the first distance information set is compared with the distance information in the first reference set. If the number of distance information in the first distance information set is greater than the number of distance information in the first reference set, the light emitting component is controlled to reduce the projection brightness to the second projection brightness based on the first projection brightness. If the number of distance information in the first distance information set is equal to the number of distance information in the first reference set, the light emitting component is not controlled to reduce the projection brightness.

[0135] For example, when the projection device is at position a and a human target is detected, the distance information included in the first distance information set includes not only the distance information of the first projection surface, but also the distance information of the human target. At this time, the number of distance information included in the first distance information set is greater than the number of distance information in the first reference set, and the projection brightness of the light-emitting component needs to be reduced to avoid excessive brightness that damages the human eye. If no human target is detected, the distance information included in the first distance information set only includes the distance information of the first projection surface. At this time, the number of distance information in the first distance information set is equal to the number of distance information in the first reference set, and the projection brightness of the light-emitting component does not need to be reduced.

[0136] like Fig. 20 As shown, if the projection position is moved from position a to the projection device at position b (when moving the position, it is assumed that no one enters the projection range. Since the projection device is moved by a person, it is assumed that it is impossible to move the projection device to a position where there are people), only the distance information of the second projection surface can be detected, and the distance information of the first projection surface can no longer be detected. At this time, the first reference set can be deleted, and the second reference set {Xb, XA} can be established based on all the distance information obtained when the second projection surface is detected, where A is an obstacle. The projection brightness of the light output component can be adjusted based on the second reference set.

[0137] When the projection device is at position b, a human target is detected, then the distance information included in the second distance information set includes not only the distance information of the second projection surface, but also the distance information of the human target. At this time, the number of distance information included in the second distance information set is greater than the number of distance information in the second reference set, and the projection brightness of the light-emitting component needs to be reduced to avoid excessive brightness that damages the human eye. If no human target is detected, the distance information included in the second distance information set only includes the distance information of the second projection surface and the distance information of obstacle A. At this time, the number of distance information in the second distance information set is equal to the number of distance information in the second reference set, and there is no need to reduce the projection brightness of the light-emitting component.

[0138] Similarly, if the projection device moves from position b to position c, the third reference set can be re-established, and then the projection brightness of the light emitting component can be adjusted based on the third reference set. The specific process of adjusting the projection brightness of the light emitting component refers to the adjustment process at position a and position c, which will not be repeated here.

[0139] It can be seen that the reference distance can be adjusted multiple times during the movement of the projection device until the projection device no longer moves. In addition, the premise for adjusting the reference distance is that the distance detection component can stably detect the distance from the projection surface to the projection device. If the distance detection component cannot stably detect the distance from the projection surface to the projection device when the projection device is moving, the reference distance can be adjusted until the distance detection component stably detects the distance from the projection surface to the projection device. The distance detection component stably detects the distance from the projection surface to the projection device, which means that the distance detection component can detect the distance of the projection surface within a preset time period (for example, within a 1-second time period, the distance detection component emits a detection beam to the projection area every 20 milliseconds, and 50 return beams can be received within 1 second. If the distances detected 50 times are all the distances of the same projection surface, it means that the distance of the projection surface can be stably detected).

[0140] For example, Fig. 20In the scene diagram shown, when the projection device moves from position a to position b, if the time the projection device stays at position b is less than the preset time (such as 1 second), it means that the user does not want to move the projection device to position b, so the reference distance does not need to be adjusted when the projection device moves from position a to position b. When the projection device moves from position b to position c, if the time the projection device stays at position c is greater than the preset time, it means that the user may want to move the projection device to position c, so the reference distance needs to be adjusted when the projection device moves from position b to position c. If the projection device continues to move from position c to other positions, it is still determined whether the reference distance needs to be adjusted according to the above method. Based on the above method, it can be determined whether the projection device is in the process of moving or has been fixed. If the projection device is in the process of moving, it is not necessary to adjust the reference distance. If it is determined that it is already a fixed position, it is necessary to adjust the reference distance at the current fixed position.

[0141] The same and similar parts between the various embodiments in this specification can be referenced to each other and will not be described again here.

[0142] Those skilled in the art can clearly understand that the technology in the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform. Based on this understanding, the technical solution in the embodiments of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of various embodiments of the present invention or certain parts of the embodiments.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0144] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A projection device, characterized in that: include: A light emitting component is configured to project projection content onto a projection surface; A distance detection component is configured to detect distance information of a target object in a target area, wherein the target object detected by the distance detection component at least includes a projection surface, and the distance information represents a straight-line distance between the target object and the projection device; The controller is configured as: Acquiring distance information of at least one target object from the distance detection component at a preset frequency; When the distance information of the target object obtained from the distance detection component includes the distance information of the first projection surface, a first reference set is established based on the distance information of the target object obtained when the first projection surface is detected, so as to adjust the projection brightness of the light output component according to the first reference set; When the distance information of the target object obtained from the distance detection component does not include the distance information of the first projection surface, and the distance information of the target object obtained from the distance detection component includes the distance information of the second projection surface, a second reference set is established based on the distance information of the target object obtained when the second projection surface is detected, so that the projection brightness of the light emitting component is adjusted according to the second reference set instead of adjusting the projection brightness of the light emitting component according to the first reference set.

2. The projection device according to claim 1, characterized in that: The controller is further configured to: After establishing a first reference set based on the distance information of the target object acquired when the first projection surface is detected, the light emitting component is controlled to be turned on to a first projection brightness.

3. The projection device according to claim 2, characterized in that: The first reference set includes at least the distance information of the first projection surface, and the controller is configured to: After controlling the light emitting component to be turned on to a first projection brightness, obtaining distance information of at least one target object from the distance detection component according to the preset frequency, and generating a first distance information set according to the obtained distance information of at least one target object, wherein the first distance information set at least includes distance information of the first projection surface; If the number of distance information in the first distance information set is greater than the number of distance information in the first reference set, controlling the light emitting component to reduce the projection brightness to a second projection brightness based on the first projection brightness; If the number of distance information in the first distance information set is equal to the number of distance information in the first reference set, the light emitting component is not controlled to reduce the projection brightness.

4. The projection device according to claim 3, characterized in that: After acquiring the distance information of the second projection surface from the distance detection component, the controller is further configured to: The light emitting component is controlled to increase the brightness to the first projection brightness based on the second projection brightness.

5. The projection device according to claim 4, characterized in that: The second reference set includes at least the distance information of the second projection surface, and the controller is configured to adjust the projection brightness of the light output component according to the second reference set: After controlling the light emitting component to increase the brightness to the first projection brightness based on the second projection brightness, obtaining the distance information of at least one target object from the distance detection component according to the preset frequency, and generating a second distance information set according to the obtained distance information of at least one target object, wherein the second distance information set includes at least the distance information of the second projection surface; If the number of distance information in the second distance information set is greater than the number of distance information in the second reference set, controlling the light emitting component to reduce the projection brightness to a second projection brightness based on the first projection brightness; If the number of distance information in the second distance information set is equal to the number of distance information in the second reference set, the light emitting component is not controlled to reduce the projection brightness.

6. The projection device according to claim 3, characterized in that: If the first reference set includes only the distance information of the first projection surface, and the number of distance information in the first distance information set is greater than the number of distance information in the first reference set, the first distance information set includes at least the distance information of the first projection surface and the distance information of the first target object; If the first reference set only includes the distance information of the first projection surface, and the number of distance information in the first distance information set is equal to the number of distance information in the first reference set, the first distance information set only includes the distance information of the first projection surface.

7. The projection device according to claim 3, characterized in that: If the first reference set includes the distance information of the first projection surface and the distance information of the second target object, and the number of distance information in the first distance information set is greater than the number of distance information in the first reference set, the first distance information set includes at least the distance information of the first projection surface, the distance information of the second target object and the distance information of the third target object; If the first reference set only includes distance information of the first projection surface, and the number of distance information in the first distance information set is equal to the number of distance information in the first reference set, the first distance information set only includes distance information of the first projection surface and distance information of the second target object.

8. The projection device according to claim 2, characterized in that: If the number of distance information in the first distance information set is greater than the number of distance information in the first reference set, the controller is further configured to: If the value of the newly added distance information in the first distance information set is less than the safety distance threshold, the brightness value of the second projection brightness is zero; If the value of the newly added distance information in the second distance information set is greater than or equal to the safety distance threshold, the brightness value of the second projection brightness is not zero.

9. The projection device according to claim 3, characterized in that: After controlling the light emitting component to reduce the projection brightness to the second projection brightness based on the first projection brightness, the controller is further configured to: Acquire distance information of at least one target object again from the distance detection component, and generate a third distance information set according to the distance information of at least one target object acquired again; If the number of distance information in the third distance information set is equal to the number of distance information in the first reference set, controlling the light emitting component to increase the projection brightness to the first projection brightness based on the second projection brightness; If the number of distance information in the third distance information set is greater than the number of distance information in the first reference set, the light emitting component is not controlled to increase the projection brightness.

10. A projection control method, characterized in that: Applied to a projection device, the projection device comprises: a light emitting component configured to project projection content onto a projection surface; a distance detection component configured to detect distance information of a target object in a target area, wherein the target object detected by the distance detection component at least includes the projection surface, and the distance information represents a straight-line distance between the target object and the projection device, and the projection control method comprises: Acquiring distance information of at least one target object from the distance detection component at a preset frequency; When the distance information of the target object obtained from the distance detection component includes the distance information of the first projection surface, a first reference set is established based on the distance information of the target object obtained when the first projection surface is detected, so as to adjust the projection brightness of the light output component according to the first reference set; When the distance information of the target object obtained from the distance detection component does not include the distance information of the first projection surface, and the distance information of the target object obtained from the distance detection component includes the distance information of the second projection surface, a second reference set is established based on the distance information of the target object obtained when the second projection surface is detected, so that the projection brightness of the light emitting component is adjusted according to the second reference set instead of adjusting the projection brightness of the light emitting component according to the first reference set.

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