Projection equipment and low-noise temperature control method

Abstract

The embodiment of the invention provides projection equipment and a low-noise temperature control method, and the method can respond to a starting instruction to detect the laser temperature of a laser light source. When the temperature of the laser is greater than or equal to a preset temperature threshold value, acquiring the running rotating speed of the heat dissipation blades; and if the operation rotating speed is the highest rotating speed, setting the backlight value of the laser light source as a target value, so that the light emitting assembly projects projection content according to the target value. Wherein the target value is smaller than a first backlight value of the laser light source when the starting instruction is received. Receiving a backlight adjusting instruction, and analyzing a second backlight value indicated by the backlight adjusting instruction in response to the backlight adjusting instruction; if the second backlight value is smaller than or equal to the target value, the backlight value of the laser light source is set to be the second backlight value, so that the light emitting assembly projects the projection content according to the second backlight value. According to the method, the overheating and noise problems of the projection equipment can be improved, the service life of the projection equipment is prolonged, and the user experience is improved.

Description

Technical Field

[0001] The present application relates to the technical field of projection equipment, and in particular to a projection equipment and a low-noise temperature control method. Background Art

[0002] A projection device is a display device that can project images or videos onto a screen. The projection device can project laser light of a specific color onto the screen through the refraction of an optical lens assembly to form a specific image. During the projection process, it is necessary to keep a certain distance between the projection device and the screen so that the projection device can project the laser light onto the placement area of ​​the screen, thereby presenting the corresponding projection image on the screen.

[0003] Micro-projection devices are known for their compact design and high performance. The core of the micro-projection device is the laser as the light source. The laser releases coherent light by exciting particles in the medium, forming a high-brightness beam suitable for projection display. However, this process is accompanied by the generation of a large amount of heat energy, which causes the internal temperature of the device to rise. To ensure stable operation, micro-projection devices can be built-in heat dissipation devices, such as small high-speed fans. The fan drives the fan blades to rotate through the principle of electromagnetic induction, generating airflow, taking away heat from the laser and other heating components, and discharging it to the external environment through the heat dissipation holes, thereby maintaining a moderate internal temperature of the device and ensuring long-term stable operation.

[0004] However, the compact design of the micro-projection device will limit the heat dissipation space, affecting the heat dissipation effect, so the projection device is prone to overheating and automatically shutting down due to long-term operation or improper operation. At the same time, the fan used for heat dissipation in the projection device will produce obvious noise when rotating at high speed, affecting the user experience. Summary of the invention

[0005] The present application provides a projection device and a low-noise temperature control method to solve the problem of overheating and noise in the projection device.

[0006] In a first aspect, some embodiments of the present application provide a projection device, including a light emitting component, a heat sink, and a controller. The light emitting component, the heat sink, and the controller are coupled, the light emitting component includes a laser light source, the heat sink includes heat sink blades, the light emitting component is configured to project projection content onto a projection surface based on the laser light source, the heat sink is configured to control the rotation of the heat sink blades, the operating speed of the heat sink blades is associated with the laser temperature of the laser light source, the operating speed includes at least a first speed and a second speed, the first speed is greater than the second speed; the controller is configured to execute the following program steps:

[0007] In response to a power-on instruction, detecting a laser temperature of the laser light source;

[0008] When the temperature of the laser is greater than or equal to a preset temperature threshold, obtaining the operating speed of the heat dissipation blade;

[0009] If the operating speed is the first speed, the backlight value of the laser light source is set to a target value, so that the light output component projects the projection content according to the target value; the target value is less than the first backlight value of the laser light source when the power-on instruction is received;

[0010] receiving a backlight adjustment instruction, and parsing a first gear position of the backlight adjustment instruction in response to the backlight adjustment instruction, wherein the first gear position is used to represent a second backlight value indicated by the backlight adjustment instruction;

[0011] If the second backlight value is less than or equal to the target value, the backlight value of the laser light source is set to the second backlight value, so that the light output component projects the projection content according to the second backlight value.

[0012] The above technical solution has the following advantages or beneficial effects: the projection device discharges the heat inside the device by rotating the heat dissipation blades in the heat dissipation device to reduce the laser temperature of the projection device; when the laser temperature is greater than the preset temperature threshold and the rotation speed of the heat dissipation blades reaches the maximum speed, the projection device can lower the backlight value so that the heat generated by the laser decreases (that is, the laser temperature also decreases accordingly), and the rotation speed of the heat dissipation blades also decreases with the laser temperature. In this way, the projection device can reduce the laser temperature in time to avoid the problem of overheating of the device and accelerate the heat dissipation effect of the device; at the same time, the heat dissipation device of the laser can also reduce the rotation speed as the temperature changes, which can reduce the generation of noise and improve the user experience. After the projection device sets the backlight value, if it receives a backlight adjustment instruction input by the user, only the instruction with a backlight value less than or equal to the current target value will take effect to ensure the correct operation of the above strategy.

[0013] In some embodiments of the present application, before the controller executes the step of obtaining the operating speed of the heat dissipation blade, it is also configured to: record the initial time point when the laser temperature is greater than or equal to the preset temperature threshold; use the initial time point as the timing starting point, and detect the laser temperature after a first time period; if the laser temperature is less than the preset temperature threshold, execute the step of detecting the laser temperature of the laser light source; if the laser temperature is greater than or equal to the preset temperature threshold, execute the step of obtaining the operating speed of the heat dissipation blade.

[0014] The above technical solution has the following advantages or beneficial effects: when the controller of the projection device detects that the laser temperature is greater than or equal to the preset temperature threshold, and the laser temperature is still greater than or equal to the preset temperature threshold after a first time period, the projection device continues to execute the step of obtaining the operating speed of the heat dissipation blade, so as to adjust the backlight value of the projection device when the speed of the heat dissipation blade reaches the maximum speed; if the temperature of the laser is less than the preset temperature threshold after the first time period, it means that the heat dissipation device has effectively lowered the laser temperature. At this time, it is sufficient to continue to monitor the temperature of the laser without additional processing to reduce the consumption of system resources.

[0015] In some embodiments of the present application, the preset temperature threshold includes a first temperature threshold and a second temperature threshold, and the first temperature threshold is less than the second temperature threshold; the controller executes setting the backlight value of the laser light source to a target value, and is specifically configured as follows: if the laser temperature is greater than or equal to the first temperature threshold but less than the second temperature threshold, and the operating speed is the first speed, then the backlight value of the laser light source is set to a first target value; if the laser temperature is greater than or equal to the second temperature threshold, and the operating speed is the first speed, then the backlight value of the laser light source is set to a second target value, and the second target value is less than the first target value.

[0016] The above technical solution has the following advantages or beneficial effects: the projection device is provided with two different temperature thresholds, and the first temperature threshold is less than the second temperature threshold. The controller of the projection device can execute the corresponding backlight setting strategy by detecting and comparing the laser temperature with the first temperature threshold and the second temperature threshold. That is, when the temperature is too high, the backlight value is set to a lower value, and when the temperature is slightly higher, the backlight value is set to a slightly higher value, which can speed up the heat dissipation of the projection device while ensuring that the impact on the user's viewing effect is reduced.

[0017] In some embodiments of the present application, before the controller executes the step of receiving the backlight adjustment instruction, it is also configured to: in response to the display instruction of the backlight setting interface, control the light emitting component to project the content of the first backlight setting interface to the projection surface, the first backlight setting interface includes a selection control for setting the backlight value, different selection controls are associated with different first gears, and the option control of the first backlight interface is in an enabled state; when a selection event of the selection control is detected, generate the backlight adjustment instruction according to the first gear associated with the selection control.

[0018] The above technical solution has the following advantages or beneficial effects: the projection device can project and display a backlight setting interface for customizing the backlight value according to the user's operation. At this time, the content displayed on the backlight setting interface includes a selection control of multiple gears (i.e., the first gear), and each gear selection control corresponds to a different backlight value. The controller of the projection device can generate a backlight adjustment instruction corresponding to the selection control according to the user's selection operation on the selection control, so that the user can customize the backlight setting to meet the user's personalized needs.

[0019] In some embodiments of the present application, the controller executes setting the backlight value of the laser light source to a target value, and is specifically configured to: obtain a second gear corresponding to the backlight value; different second gears are associated with different backlight values, and the backlight values ​​associated with the second gears include the backlight values ​​indicated by the first gear, and the number of the second gears is greater than the number of the first gears; set the backlight value of the laser light source to the target value according to the second gear and a preset decreasing gradient, and the decreasing gradient is to reduce the second gear of the backlight value by 1 every second time period.

[0020] The above technical solution has the following advantages or beneficial effects: when the projection device sets the backlight value, the backlight value of the laser light source is gradually lowered according to a preset time period and a decreasing gradient, wherein, in the process of the projection device lowering the backlight value, the number of gears lowered is greater than the number of gears displayed on the user interface, and the backlight value can be processed in a refined manner. In this way, in the process of setting the backlight value, the projected content presented on the projection surface will not change drastically, so as to optimize the user's viewing experience.

[0021] In some embodiments of the present application, after the controller executes the step of detecting the laser temperature of the laser light source, it is also configured to: detect the on-state of the low noise mode; if the on-state of the low noise mode is a disabled state, execute the step of obtaining the operating speed of the heat dissipation blade when the laser temperature is greater than or equal to a preset temperature threshold; if the on-state of the low noise mode is an enabled state, obtain a third temperature threshold, and set the backlight value of the laser light source according to the third temperature threshold.

[0022] The above technical solution has the following advantages or beneficial effects: the projection device also detects in real time whether the low noise mode is turned on. If the low noise mode is enabled, the usable backlight value will not be too high, and the projection device adjusts the backlight value according to the temperature threshold corresponding to the low noise mode to adapt to different scenes.

[0023] In some embodiments of the present application, if the on-state of the low noise mode is an enabled state, the controller is further configured to: when the laser temperature is greater than or equal to the third temperature threshold, record the initial time point when the laser temperature is greater than or equal to the third temperature threshold; take the initial time point as the timing starting point, and detect the laser temperature after a third time period; if the laser temperature is less than the third temperature threshold, perform the step of detecting the laser temperature of the laser light source; if the laser temperature is greater than or equal to the third temperature threshold, set the backlight value of the laser light source to a low noise backlight value, and the low noise backlight value is less than the target value.

[0024] The above technical solution has the following advantages or beneficial effects: when the low noise mode is enabled, if the laser temperature is greater than or equal to the temperature threshold corresponding to the low noise mode, and is still greater than the temperature threshold after a third time period, the projection device can directly set the backlight value to a value lower than the target value to enhance the heat dissipation effect of the projection device.

[0025] In some embodiments of the present application, if the low noise mode is in an enabled state, the controller is further configured to: in response to a display instruction of the backlight setting interface, control the light output component to project the content of a second backlight setting interface onto the projection surface, the second backlight setting interface including a selection control for setting the backlight value, and the option control of the second backlight setting interface is in a disabled state.

[0026] The above technical solution has the following advantages or beneficial effects: in order to achieve a low noise effect, when the low noise mode is enabled, the projection device will set the option control in the backlight setting interface to a disabled state to ensure accurate operation of the low noise mode.

[0027] In some embodiments of the present application, after the controller executes the step of setting the backlight value of the laser light source to the target value, the controller is also configured to: record the first backlight value in response to a shutdown instruction, and execute a shutdown procedure of the projection device, wherein the shutdown procedure is used to shut down the projection device; receive the power-on instruction; read the recorded first backlight value in response to the power-on instruction; set the laser light source to the first backlight value, and execute the step of detecting the laser temperature of the laser light source.

[0028] The above technical solution has the following advantages or beneficial effects: after the projection device adjusts the backlight value according to the laser temperature and the operating speed, if it is turned off, the backlight value before the adjustment is remembered; after the projection device is restarted, the backlight value is set according to the backlight value before the adjustment to meet the user's personalized needs.

[0029] In a second aspect, some embodiments of the present application further provide a low-noise temperature control method, which can be applied to the projection device provided in the first aspect, wherein the projection device includes a light output component, a heat dissipation device and a controller, wherein the light output component, the heat dissipation device and the controller are coupled; the light output component includes a laser light source, and is configured to project projection content onto a projection surface based on the laser light source; the heat dissipation device includes a heat dissipation blade, and is configured to control the rotation of the heat dissipation blade, and the operating speed of the heat dissipation blade is correlated with the laser temperature of the laser light source, and the operating speed includes at least a first speed and a second speed, and the first speed is greater than the second speed; the method includes the following steps:

[0030] In response to a power-on instruction, detecting a laser temperature of the laser light source;

[0031] When the temperature of the laser is greater than or equal to a preset temperature threshold, obtaining the operating speed of the heat dissipation blade;

[0032] If the operating speed is the first speed, the backlight value of the laser light source is set to a target value, so that the light output component projects the projection content according to the target value; the target value is less than the first backlight value of the laser light source when the power-on instruction is received;

[0033] receiving a backlight adjustment instruction, and parsing a first gear position of the backlight adjustment instruction in response to the backlight adjustment instruction, wherein the first gear position is used to represent a second backlight value indicated by the backlight adjustment instruction;

[0034] If the second backlight value is less than or equal to the target value, the backlight value of the laser light source is set to the second backlight value, so that the light output component projects the projection content according to the second backlight value.

[0035] It can be seen from the above technical solutions that the projection device and low-noise temperature control method provided by some embodiments of the present application can detect the laser temperature of the laser light source in response to a power-on command. When the laser temperature is greater than or equal to the preset temperature threshold, the operating speed of the heat dissipation blade is obtained; if the operating speed is the maximum speed, the backlight value of the laser light source is set to the target value, so that the light-emitting component projects the projection content according to the target value. Among them, the target value is less than the first backlight value of the laser light source when the power-on command is received. Then receive the backlight adjustment command, and in response to the backlight adjustment command, parse the second backlight value indicated by the backlight adjustment command; if the second backlight value is less than or equal to the target value, set the backlight value of the laser light source to the second backlight value, so that the light-emitting component projects the projection content according to the second backlight value. The method can improve the overheating and noise problems of the projection device, extend the service life of the projection device, and improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] 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 or the description of the prior art 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.

[0037] Figure 1 This is a schematic diagram of the projection state of the projection device in some embodiments of the present application;

[0038] Figure 2 A schematic diagram of the structure of a projection device provided in some embodiments of the present application;

[0039] Figure 3 A schematic diagram of the optical-mechanical architecture of a projection device provided in some embodiments of the present application;

[0040] Figure 4 A schematic diagram of the optical path of a projection device provided in some embodiments of the present application;

[0041] Figure 5 A schematic diagram of the lens structure of a projection device provided in some embodiments of the present application;

[0042] Figure 6 A schematic diagram of the distance sensor and camera structure provided in some embodiments of the present application;

[0043] Figure 7 A schematic diagram of a system framework of a projection device provided in some embodiments of the present application;

[0044] Figure 8 A schematic flow chart of a low-noise temperature control method provided in some embodiments of the present application;

[0045] Fig. 9 An interactive diagram of a low-noise temperature control method provided by some embodiments of the present application;

[0046] Fig.10 A schematic diagram of a process flow of pre-slow-descent detection provided in some embodiments of the present application;

[0047] Fig.11 A schematic diagram of a process for slowly setting a backlight value provided in some embodiments of the present application;

[0048] Fig.12a A schematic diagram of the effect of the first-level interface of backlight settings provided in some embodiments of the present application;

[0049] Figure 12b A schematic diagram of the effect of setting a secondary interface for backlight provided in some embodiments of the present application;

[0050] Fig.13 A schematic diagram of a process for setting a backlight value as a target value provided in some embodiments of the present application;

[0051] Fig.14 A schematic diagram of the correspondence between backlight gears and backlight values ​​provided in some embodiments of the present application;

[0052] Fig.15 A schematic diagram of the effect of the setting interface of the low noise mode provided in some embodiments of the present application;

[0053] Fig.16 A schematic diagram of a process flow of a low noise slow-down mode provided in some embodiments of the present application;

[0054] Fig.17 A schematic diagram of the effect of the backlight setting interface in the low noise mode provided by some embodiments of the present application;

[0055] Fig.18 A schematic diagram of the software architecture provided for some embodiments of the present application. DETAILED DESCRIPTION

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] In some embodiments, the projection device 2 can also communicate data with the server through various communication methods. The projection device 2 can be allowed to communicate and connect through a local area network (LAN), a wireless local area network (WLAN) and other networks.

[0064] 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.

[0065] In some embodiments, reference Figure 1-Figure 2 A projection device provided in the present application includes a projection screen and a projection device 2. The projection screen is fixed at a first position, and the projection device 2 is placed at a second position, so that the image projected by it matches the projection screen. 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.

[0066] 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.

[0067] 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.

[0068] 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 100, at least one laser driving component 30, and at least one brightness sensor 40. The laser light source 100 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.

[0069] 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 100 , 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 .

[0070] 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.

[0071] Figure 4 A schematic structural diagram of a projection device according to an embodiment of the present application is shown.

[0072] In some embodiments, the laser light source 100 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.

[0073] 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), RAM (Random Access Memory, RAM), ROM (Read-Only Memory, ROM), a first interface to an nth interface for input / output, a communication bus (Bus), etc.

[0074] In some embodiments, the projection device 2 further includes a communicator connected to a communication bus (Bus). The communicator is a component used to communicate with an external device or server according to various communication protocol types.

[0075] 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.

[0076] When the projection device moves, its projection angle and the distance to the projection surface change, which will cause the projected image to deform, and the projected image will be displayed as a trapezoidal image or other deformed image; the controller of the projection device 2 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.

[0077] The camera can be used to capture the image displayed on the projection surface, and can be a camera. The camera can include a lens assembly, in which a photosensitive element and a lens are provided. The lens refracts light through a plurality of lenses, so that the light of the image of the scene can be irradiated on the photosensitive element. The photosensitive element can be selected based on the detection principle of a charge coupled device or a complementary metal oxide semiconductor according to the specifications of the camera, and converts the light signal into an electrical signal through a photosensitive material, and outputs the converted electrical signal into image data.

[0078] Figure 5 Schematic diagram of the lens structure of the projection device 2 in some embodiments is shown. In order to support the automatic focusing process of the projection device 2, as shown in FIG. Figure 5 As shown, the lens 300 of the projection device 2 may further include an optical component 310 and a drive motor 320. The optical component 310 is a lens group composed of one or more lenses, which can refract the light emitted by the optical machine 200 so that the light emitted by the optical machine 200 can be transmitted to the projection surface to form a transmission content image.

[0079] The optical assembly 310 may include a lens barrel and a plurality of lenses disposed in the lens barrel. Depending on whether the position of the lens can be moved, the lens in the optical assembly 310 may be divided into a movable lens 311 and a fixed lens 312. By changing the position of the movable lens 311 and adjusting the distance between the movable lens 311 and the fixed lens 312, the overall focal length of the optical assembly 310 may be changed. Therefore, the driving motor 320 may drive the movable lens 311 to move its position by connecting to the movable lens 311 in the optical assembly 310, thereby realizing an automatic focusing function.

[0080] It should be noted that the focusing process described in some embodiments of the present application refers to changing the position of the movable lens 311 by driving the motor 320, thereby adjusting the distance between the movable lens 311 and the fixed lens 312, that is, adjusting the image plane position. Therefore, the imaging principle of the lens combination in the optical component 310, the adjustment of the focal length is actually adjusting the image distance, but in terms of the overall structure of the optical component 310, adjusting the position of the movable lens 311 is equivalent to adjusting the overall focal length of the optical component 310.

[0081] When the distance between the projection device 2 and the projection surface is different, the lens of the projection device 2 needs to adjust different focal lengths to project a clear image on the projection surface. During the projection process, the distance between the projection device 2 and the projection surface will require different focal lengths due to the different placement positions of the user. Therefore, in order to adapt to different usage scenarios, the projection device 2 needs to adjust the focal length of the optical component 310.

[0082] Figure 6 FIG. 4 shows a schematic diagram of the structure of the distance sensor 600 and the camera 700 in some embodiments. Figure 6 As shown, the projection device 2 may also have a built-in or external camera 700, and the camera 700 may capture the image projected by the projection device 2 to obtain the projection content image. The projection device 2 then performs a clarity detection on the projection content image to determine whether the current lens focal length is appropriate, and adjusts the focal length if it is not appropriate. When automatically focusing based on the projection content image captured by the camera 700, the projection device 2 may continuously adjust the lens position and take pictures, and find the focusing position by comparing the clarity of the front and rear position pictures, thereby adjusting the movable lens 311 in the optical component to a suitable position. For example, the controller may first control the drive motor 320 to gradually move the focus starting position of the movable lens 311 to the focus end position, and continuously obtain the projection content image through the camera 700 during this period. Then, by performing a clarity detection on multiple projection content images, the position with the highest clarity is determined, and finally the drive motor 320 is controlled to adjust the movable lens 311 from the focus terminal to the position with the highest clarity, thereby completing the automatic focusing.

[0083] Figure 7 A schematic diagram of a system framework for realizing display control of a projection device according to an embodiment of the present application is shown.

[0084] In some embodiments, the projection device 2 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.

[0085] In some embodiments, the projection device 2 is configured with a gyroscope sensor; when the device is moving, the gyroscope sensor can sense the position movement and actively collect movement data; then the collected data is sent to the application service layer through the system framework layer to support the application data required during the user interface interaction and application interaction process. The collected data can also be used for data calls by the controller in the algorithm service implementation.

[0086] In some embodiments, the projection device 2 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.

[0087] In some embodiments, the camera 700 configured for the projection device 2 may be a binocular camera, a depth camera, or a 3D camera, etc.; the data collected by the camera 700 will be sent to the camera service, and then the camera service will send the collected image data to the process communication framework and / or the projection device correction service; the projection device correction service can receive the camera collection 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.

[0088] In some embodiments, data is interacted with the application service through the 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 2 operating system to generate control signals, and sends the control signals to the optical machine 200 control drive to control the working condition of the optical machine 200 and realize automatic correction of the displayed image.

[0089] In some embodiments, when an image correction instruction is detected, the projection device 2 can correct the projected image. For the correction of the projected image, an association relationship between the distance, the horizontal angle, and the offset angle can be created in advance. Then the controller in the projection device 2 obtains the current distance from the optical machine 200 to the projection surface, and determines the angle between the optical machine 200 and the projection surface at this moment in combination with the associated relationship to achieve projection image correction. The angle is specifically implemented as the angle between the central axis of the optical machine 200 and the projection surface.

[0090] In some embodiments, the projection device 2 automatically completes the calibration and refocuses, and the controller will detect whether the automatic focus function is turned on; when the automatic focus function is not turned on, the controller will end the automatic focus service; when the automatic focus function is turned on, the projection device 2 will obtain the detection distance of the time-of-flight sensor through the middleware for calculation.

[0091] The controller queries the preset mapping table according to the acquired distance to obtain the focal length of the projection device 2; then the middleware sets the acquired focal length to the optical machine 200 of the projection device 2; wherein the middleware is a series of applications for the focus control process. After the optical machine 200 emits laser light at the above focal length, the camera will execute the photo command; the controller determines whether the focus process of the projection device 2 is completed according to the acquired captured image and the evaluation function.

[0092] If the judgment result meets the preset completion conditions, the control of the automatic focusing process ends; if the judgment result does not meet the preset completion conditions, the middleware will fine-tune the focal length parameters of the projection device 2 optical machine 200, for example, the focal length can be gradually fine-tuned with a preset step length, and the adjusted focal length parameters will be set to the optical machine 200 again; thereby achieving repeated photo taking and clarity evaluation steps, and finally finding the optimal focal length through clarity comparison to complete automatic focusing.

[0093] In some embodiments, the projection device 2 includes a light emitting component, which may include a laser light source 100, which may include a laser. The controller of the projection device 2 may control the laser to excite particles in the medium to release coherent light, forming a high-brightness light beam to form corresponding projection content.

[0094] In some embodiments, the projection device 2 can adjust the brightness of the projected content by setting the backlight value of the laser light source 100. The larger the backlight value, the higher the brightness of the projected content, the more heat the laser light source 100 generates, and the more heat the entire projection device 2 generates during operation.

[0095] As the heat of the projection device 2 increases during operation, the laser temperature of the laser light source 100 increases. If the laser temperature is too high, the performance of the laser light source will be affected, causing problems such as freezing or even damage. Therefore, in some embodiments, the projection device 2 is also equipped with a heat dissipation device, and the controller of the projection device 2 can accelerate the heat dissipation effect of the projection device 2 by controlling the operation of the heat dissipation device to reduce the laser temperature. For example, the heat dissipation device can be configured in the optical machine 200 of the projection device 2.

[0096] In some embodiments, the heat dissipation device may include heat dissipation blades, such as fan blades, etc. The controller of the projection device 2 may generate airflow by driving the rotation of the heat dissipation blades to discharge the internal heat of the projection device 2 to the external environment, thereby achieving a rapid heat dissipation and cooling effect of the projection device 2.

[0097] In order to speed up heat dissipation, in some embodiments, the heat dissipation device may also include components such as heat sinks and heat pipes, which can quickly discharge the heat of the projection device 2 to the external environment through heat conduction and other means to reduce the internal heat of the projection device 2 and achieve a cooling effect.

[0098] Due to different working scenarios (such as different modes, different operating states, and different user operations, etc.), the heat generated by the projection device 2 is different, and the laser temperature is also different. Therefore, in some embodiments, the operating speed of the heat dissipation blades in the heat dissipation device and the laser temperature of the laser light source 100 are correlated, and the operating speed and the laser temperature are positively correlated. Among them, the speed of the heat dissipation blades in the heat dissipation device can be divided into multiple fan gears, each fan gear corresponds to a different operating speed, and the higher the fan gear, the faster the operating speed; then the higher the laser temperature in the projection device 2, the higher the fan gear set by the heat dissipation device.

[0099] For example, the controller of the projection device 2 can detect the laser temperature of the laser light source 100 in real time, and divide the laser temperature into three temperature gears according to the acquired laser temperature and the preset temperature range. Correspondingly, the projection device 2 is also provided with three different fan gears. Among them, the laser temperature of each temperature gear corresponds to a corresponding fan gear, and the higher the temperature of the temperature gear, the higher the corresponding fan gear.

[0100] In some embodiments, the correlation between the fan gear and the backlight gear can also be set in the projection device 2. Similarly, different backlight gears correspond to different backlight values, and the higher the backlight gear, the greater the backlight value; then, the higher the backlight gear in the projection device 2, the higher the fan gear set by the heat dissipation device.

[0101] For the convenience of description and distinction, in the embodiment of the present application, the backlight level at which the user interface can be displayed is represented as the first level, and the user interface is the projection content projected by the projection device 2 onto the projection surface.

[0102] In order to facilitate the detection of laser temperature, in some embodiments, the light output component of the projection device 2 is also configured with an NTC (Negative Temperature Coefficient) temperature sensor, and the NTC temperature sensor is closely attached to the laser light source 100. When detecting the laser temperature, the projection device 2 can communicate with the NTC temperature sensor through the controller to monitor the laser temperature of the laser light source 100 in real time.

[0103] However, due to the small size of the projection device 2, such as a micro-projection device, each component will be compactly confined within the device space, resulting in a small heat dissipation space, which affects the speed of heat dissipation. In this way, if the projection device 2 is operated for a long time or the user starts a high-energy operation, the projection device 2 is prone to overheating of the mainboard, thereby causing loss or affecting performance. In addition, when the heat dissipation device of the projection device 2 controls the rotation of the heat dissipation blades to dissipate heat, it will also generate a certain amount of noise. The faster the rotation speed, the greater the noise generated. If the device continues to maintain a high temperature, the noise generated by the projection device 2 will also last for a long time, affecting the user's experience.

[0104] To this end, some embodiments of the present application provide a projection device 2, which can dynamically adjust the backlight value of the projection device 2 according to the operating speed of the heat dissipation blades in the heat dissipation device and the laser temperature of the laser light source 100, so as to alleviate the problems of excessive laser temperature and excessive noise of the heat dissipation device, thereby accelerating the heat dissipation speed of the projection device 2; and, in the process of adjusting the backlight, the projection device 2 can distinguish and respond to the user's adjustment instructions for the backlight value, ensuring that the heat dissipation acceleration will not be affected, thereby realizing intelligent management of heat dissipation and low noise.

[0105] like Figure 8-Figure 9 As shown, in some embodiments, the projection device 2 may include a light emitting component, a heat sink and a controller. The light emitting component may include a laser light source 100; the heat sink may include heat sink blades, such as fan blades; the light emitting component, the heat sink and the controller are coupled so that the controller can communicate with the light emitting component and the heat sink and control the operation of the light emitting component and the heat sink.

[0106] In some embodiments, the light emitting assembly is configured to project the projection content onto the projection surface based on the laser light source 100. The laser light source 100 may include one or more lasers, and the projection surface may be a curtain (such as a white plastic curtain, a gray plastic curtain, a glass bead curtain, etc.), a wall, a projection screen, etc.

[0107] In some embodiments, the heat dissipation device is configured to control the rotation of the heat dissipation blades to form a heat dissipation channel to discharge the heat inside the projection device 2 to the external environment. The operating speed of the heat dissipation blades is associated with the laser temperature of the laser light source. For example, the operating speed may correspond to a plurality of different fan gears, and the laser temperature may correspond to a plurality of temperature gears. The higher the fan gear, the faster the operating speed. The higher the temperature gear, the higher the laser temperature. The higher the temperature gear, the higher the fan gear associated with. That is, the laser temperature and the operating speed are positively correlated. The higher the laser temperature, the higher the operating speed of the heat dissipation blades in the heat dissipation device.

[0108] In some embodiments, the operating speed includes at least a first speed and a second speed, and the first speed is greater than the second speed. That is, the fan gear includes at least two gears, and the first speed is the speed corresponding to the highest fan gear. Based on this, for the convenience of distinction and description, in the embodiment of the present application, the first speed is used to represent the highest speed, and the second speed is used to represent the remaining speeds lower than the highest speed.

[0109] like Figure 8 As shown, in some embodiments, the controller is configured to perform the following steps:

[0110] S801: In response to a power-on instruction, detecting the laser temperature of the laser light source.

[0111] The projection device 2 can receive power-on commands input by the user based on different interaction methods. In some embodiments, the power-on commands can be input based on a control device supporting the projection device 2, or can be input by the user through a switch button configured on the projection device 2 itself, or can be input through voice operation, etc.

[0112] After receiving the power-on command input by the user, the projection device 2 can respond to the power-on command and execute the power-on program through the controller to put the projection device 2 into the running state (or power-on state). At this time, in order to prevent the projection device 2 from overheating, the controller of the projection device 2 can also detect the laser temperature of the laser light source 100 in real time to obtain the temperature information of the projection device 2.

[0113] In some embodiments, when detecting the laser temperature, the projection device 2 can read the laser temperature detected by the NTC temperature sensor through a controller. For example, the controller of the projection device 2 can read the voltage value of the thermistor in the NTC temperature sensor through an ADC (Analog-to-Digital Converter), and then convert it into a temperature value through calculation to obtain the laser temperature.

[0114] In order to reduce the consumption of system resources, in some embodiments, the projection device 2 can check the laser temperature according to a preset time period to reduce the frequency of obtaining the laser temperature and the amount of data obtained. For example, the preset time period is 5s, and after the projection device 2 enters the power-on state, the controller of the projection device 2 can detect the laser temperature every 5s.

[0115] In some embodiments, after the controller of the projection device 2 detects the laser temperature of the laser light source 100, it also controls the heat dissipation device to control the rotation of the heat dissipation blades according to the corresponding operating speed according to the laser temperature. For example, the heat dissipation fan includes two heat dissipation gears, namely the first fan gear and the second fan gear. The operating speed of the heat dissipation blades in the first fan gear is the first speed, and the operating speed of the heat dissipation blades in the second fan gear is the second speed; the temperature gear of the laser temperature also includes two temperature gears, namely the first temperature gear and the second temperature gear. The minimum value of the temperature interval corresponding to the first temperature gear is greater than the maximum value of the temperature interval corresponding to the second temperature gear. When the laser temperature is at the first temperature gear, the controller of the projection device 2 controls the heat dissipation device to control the rotation of the heat dissipation blades at the first speed; when the laser temperature is at the second temperature gear, the controller of the projection device 2 controls the heat dissipation device to control the rotation of the heat dissipation blades at the second speed.

[0116] It should be noted that the fan position of the above-mentioned heat dissipation device and the temperature position of the laser temperature are only exemplary descriptions and are not intended to be limiting. The fan position and temperature position of the embodiment of the present application may also be more positions.

[0117] After the controller of the projection device 2 controls the heat dissipation device to rotate and dissipate heat according to the temperature of the laser, part of the heat of the projection device 2 is discharged to the external environment, which can accelerate the heat dissipation speed of the projection device 2. However, due to the diversity of the operation scenarios of the projection device 2, the heat dissipation device may not be able to achieve heat dissipation and cooling in a timely and rapid manner.

[0118] Therefore, in some embodiments, the projection device 2 may be provided with a temperature threshold, i.e., a preset temperature threshold. The controller of the projection device 2 may determine whether there is a need for accelerated heat dissipation of the current projection device 2 by comparing the preset temperature threshold with the laser temperature. In the embodiment of the present application, the function of accelerating heat dissipation is represented as a current slow-down function, i.e., whether the current slow-down function is activated or not is determined by the preset temperature threshold and the laser temperature.

[0119] In some embodiments, the projection device 2 may have multiple preset temperature thresholds. The projection device 2 may determine a specific processing strategy for the current ramp-down function by comparing the relationship between the laser temperature and each preset temperature threshold. For example, the preset temperature threshold may include a first temperature threshold and a second temperature threshold, the first temperature threshold being 54° C., and the second temperature threshold being 56° C.

[0120] S802: When the laser temperature is greater than or equal to a preset temperature threshold, the operating rotation speed of the heat dissipation blade is obtained.

[0121] When the projection device 2 detects that the laser temperature is greater than or equal to the preset temperature threshold, the operating speed of the heat dissipation blades can be obtained to determine whether the heat dissipation device is currently at the highest speed.

[0122] like Fig.10 As shown, in order to reduce unnecessary resource consumption, in some embodiments, before obtaining the movement speed of the heat dissipation blade, the projection device 2 also records the initial time point when the laser temperature is greater than or equal to the preset temperature threshold through the controller (S1001). Then, taking the initial time point as the timing starting point, the laser temperature is detected again after the first time period (S1002). If the laser temperature is less than the preset temperature threshold, the controller of the projection device 2 executes the step of detecting the laser temperature of the laser light source (i.e., S801); if the laser temperature is still greater than or equal to the preset temperature threshold, the controller of the projection device 2 executes the step of obtaining the operation speed of the heat dissipation blade (i.e., S802).

[0123] That is to say, when the projection device 2 detects that the laser temperature exceeds the preset temperature threshold, it starts timing with the current time point as the timing starting point; after the preset first time period, the laser temperature is detected again, and the laser temperature is compared with the preset temperature threshold. If the laser temperature detected again still exceeds the preset temperature threshold, the projection device 2 determines whether the operation is at the highest speed; if the laser temperature does not exceed the preset temperature threshold, it means that the projection device 2 has effectively improved the problem of excessive heat through the heat dissipation device, and there is no need to trigger the current ramp-down function additionally, and the laser temperature can continue to be monitored.

[0124] For example, the preset temperature threshold is 54°C, and the first time period is 10s. When the controller of the projection device 2 detects that the laser temperature is ≥54°C, and the laser temperature is ≥54°C after 10s, the controller of the projection device 2 detects the current operating speed of the heat dissipation device to determine whether the operating speed reaches the maximum speed; otherwise, the controller of the projection device 2 does not perform processing and continues to monitor the laser temperature.

[0125] S803: If the operating speed is the first speed, the backlight value of the laser light source is set to a target value so that the light output component projects the projection content according to the target value; the target value is smaller than the first backlight value of the laser light source when the power-on command is received.

[0126] When the projection device 2 obtains the operating speed as the first speed, it means that the operating speed of the heat dissipation device has reached the maximum speed at this time, and the laser temperature has continued to exceed the preset temperature threshold for a certain period of time. The projection device 2 can trigger the current ramp-down function through the controller to reduce heat generation and accelerate the heat dissipation speed of the projection device 2.

[0127] Therefore, in some embodiments, when the projection device 2 triggers the current ramp-down function, the backlight value of the laser light source 100 is lowered, so that the light-emitting component projects the projection content according to the lowered backlight value, thereby reducing the heat generated by the laser light source 100 in the projection device 2, thereby accelerating the heat dissipation speed of the projection device 2.

[0128] In some embodiments, when the projection device 2 adjusts the backlight value of the laser light source 100 to a lower value, the backlight value of the laser light source 100 is set to a target value. The target value is less than the backlight value (i.e., the first backlight value) when the projection device 2 receives the power-on command. In this way, by adjusting the backlight value of the laser light source 100 to a lower value, the heat output in the projection device 2 is reduced.

[0129] In the case where there are multiple preset temperature thresholds, in some embodiments, the preset temperature threshold configured by the projection device 2 includes a first temperature threshold and a second temperature threshold, and the first temperature threshold is less than the second temperature threshold. Accordingly, for different temperature thresholds, the target value to be set by the projection device 2 is also different.

[0130] like Fig.11 As shown, in some embodiments, if the laser temperature is greater than or equal to the first temperature threshold but less than the second temperature threshold, and the operating speed is the first speed, the backlight value of the laser light source 100 is set to the first target value (S1101); if the laser temperature is greater than or equal to the second temperature threshold, and the operating speed is the first speed, the backlight value of the laser light source 100 is set to the second target value (S1102). The second target value is less than the first target value.

[0131] For example, the first temperature threshold is 54°C, the second temperature threshold is 56°C, the fan gear includes 9 gears, namely 1-9, and 9 is the highest fan gear, and its corresponding operating speed is the highest speed (i.e., the first speed); the backlight gear (first gear) that can be displayed on the UI interface corresponding to the backlight value includes 1-10, and the backlight value gradually increases from 1-10; the laser temperature is Tm. When the projection device 2 detects that Tm ≥ 54°C, and Tm ≥ 54°C after 10s and the fan gear is at gear 9, the backlight of the laser light source 100 is slowly reduced to gear 7; and when it detects that Tm ≥ 56°C, and Tm ≥ 56°C after 10s and the fan gear is at gear 9, the backlight of the laser light source 100 is slowly reduced to gear 5.

[0132] The first gear is a gear that can be displayed on the UI interface for setting the backlight value. In some embodiments, in order to facilitate user operation and control, the controller of the projection device 2 can generate a backlight setting interface, and project the projection content of the backlight setting interface onto the projection surface through the light emitting component, so as to display the content of the backlight setting interface to the user through the projection surface. Among them, the backlight setting interface includes a selection control corresponding to the first gear.

[0133] That is, in some embodiments, the controller of the projection device 2 can control the light output component to project the content of the first backlight setting interface to the projection surface in response to the display instruction of the backlight setting interface. The first backlight setting interface includes a selection control for setting the backlight value, different selection controls are associated with different first gears, and the option control of the first backlight interface is enabled. When the controller of the projection device 2 detects the selection event of the selection control, the corresponding backlight adjustment instruction is generated according to the first gear associated with the selection control.

[0134] For example, Fig.12a The backlight setting interface shown in the figure allows users to Fig.12a The backlight setting control 1201 performs the selected operation, triggering the backlight setting interface to display Figure 12b The option control 1202 shown. The user can generate the backlight adjustment instruction corresponding to the option control 1202 by selecting the option control 1202 (e.g., if the option control of 8 levels is selected, the backlight adjustment instruction of the backlight value represented by 8 levels is generated). In other words, the user can also customize the backlight value of the projection device 2 through the backlight setting interface displayed by the projection device 2, so that the projection device 2 projects the projection content according to different backlight values, thereby forming display effects under different brightness.

[0135] like Fig.13 As shown, in some embodiments, when the controller of the projection device 2 sets the backlight value of the laser light source 100 to the target value, the second gear corresponding to the backlight value can be first obtained (S1301). Different second gears are associated with different backlight values, and the backlight values ​​associated with the second gears include the backlight values ​​indicated by the first gear, and the number of the second gears is greater than the number of the first gears. For example, Fig.14 As shown, Fig.14 is the corresponding relationship between the second gear 1402 and the backlight value. Among them, the number of the first gear 1401 is 10, the number of the second gear 1402 is 30, and the corresponding relationship between the first gear 1401 and the second gear 1402 is as follows: Fig.14 shown.

[0136] After the controller of the projection device 2 obtains the second gear corresponding to the backlight value of the current laser light source 100, the backlight value of the laser light source 100 can be set to the target value (S1302) according to the second gear and the preset decreasing gradient. The decreasing gradient is to reduce the second gear of the backlight value by 1 every second time period.

[0137] For example, the second time period is 2s, such as Fig.14As shown in the second gear 1402, the projection device 2 is in the 9th gear of the first gear (i.e. the backlight value gear displayed in the UI) when the current slow-down function is triggered, that is, the 27th gear of the second gear 1402. Triggering the slow-down function requires adjusting the backlight value to the 7th gear of the first gear 1401, that is, the 21st gear of the second gear 1402. The controller of the projection device 2 needs to set the backlight value according to the backlight value corresponding to the second gear 1402, and lower the second gear every 2s. That is, start adjusting from the backlight value of 90, set it to 82 after an interval of 2s, and set it to 81 after another interval of 2s, and so on until the backlight value is set to 70, and the projection device 2 completes the current slow-down function.

[0138] It should be noted that the backlight level of the backlight value to be adjusted when the projection device 2 triggers the current ramp-down function is not limited to a specific level and backlight value. The above target value and the corresponding backlight level can be set according to the actual application scenario and device model, and this application does not impose any restrictions on this.

[0139] S804: Receive a backlight adjustment instruction, and parse a first gear position of the backlight adjustment instruction in response to the backlight adjustment instruction, where the first gear position is used to represent a second backlight value indicated by the backlight adjustment instruction.

[0140] The controller of the projection device 2 triggers the current ramp-down function and lowers the backlight value to accelerate the heat dissipation of the projection device 2. At this time, if a backlight adjustment instruction input by the user is received, the controller of the projection device 2 responds to the backlight adjustment instruction and parses the first gear associated with the backlight adjustment instruction (i.e., the backlight gear displayed by the UI).

[0141] In order to balance the effect of the current ramp-down function and user needs, the controller of the projection device 2 parses the first gear associated with the backlight adjustment instruction, and then compares the relationship between the backlight value indicated by the first gear (i.e., the second backlight value) and the above-mentioned target value. If the second backlight value is less than or equal to the target value, it means that the user wants to adjust the backlight value to a lower level or equal to the backlight gear adjusted by the current current ramp-down function, and the projection device 2 can directly respond to the backlight adjustment instruction to make it effective, so as to achieve the purpose of reducing heat generation; and if the second backlight value is greater than the target value, it means that the user wants to adjust the backlight value to a higher level than the backlight gear adjusted by the current current ramp-down function, and the backlight adjustment instruction will affect the effect of the current ramp-down function, so the projection device 2 will ignore the backlight adjustment instruction and not respond.

[0142] S805: If the second backlight value is less than or equal to the target value, the backlight value of the laser light source is set to the second backlight value, so that the light output component projects the projection content according to the second backlight value.

[0143] That is, after the controller of the projection device 2 parses the second gear of the backlight adjustment instruction, it determines whether the backlight adjustment instruction is effective according to the relationship between the second backlight value indicated by the first gear and the target value. If the second backlight value is less than or equal to the target value, the controller of the projection device 2 directly responds to the backlight adjustment instruction, so as to accelerate the heat dissipation effect without affecting the effect of the current slow-down function.

[0144] It can be seen from the above embodiments that the projection device 2 provided in some embodiments of the present application can slowly reduce the backlight value of the projection device 2 to the backlight level corresponding to the target value when the laser temperature is higher than a certain temperature and the operating speed of the heat dissipation device reaches the highest fan level. Among them, the slowly reduced backlight level (second level) is determined according to the backlight level (first level) displayed by the UI. The projection device 2 only calls the second level when the current ramp-down function is triggered, and the backlight level projected and displayed by the projection device 2 remains at the first level. After the current ramp-down function is triggered, the backlight value of the projection device 2 maintains the target value set by the current ramp-down function. At this time, the user sets the backlight value. If the first level is raised, the actual backlight value does not change; if the first level is lowered, the actual backlight value decreases accordingly.

[0145] In some embodiments, after the projection device 2 triggers the current ramp-down function, it also responds to the shutdown command, records the first backlight value, and executes the shutdown program of the projection device 2. The shutdown program is used to shut down the projection device 2. Then, when the power-on command is received, it responds to the power-on command, reads the recorded first backlight value, sets the laser light source 100 to the first backlight value, and executes the step of detecting the laser temperature of the laser light source 100, i.e., step S801.

[0146] That is, after the projection device 2 triggers the current slow-down function, if it is shut down and restarted, the projection device 2 will set the backlight value after this startup according to the backlight value set before the last triggering of the current slow-down function. That is, each time the projection device 2 is turned on, it memorizes the backlight level when it was shut down last time, and sets the backlight level of the projection device 2 after restarting according to the memorized backlight level.

[0147] In some embodiments, after the projection device 2 triggers the current slow-down function, if the projection device 2 receives a backlight adjustment instruction with a second backlight value greater than the target value, the projection device 2 does not take effect on the backlight value indicated by the backlight adjustment instruction, but needs to update the backlight adjustment setting interface according to the backlight adjustment instruction to memorize the user's selection operation. That is, the backlight of the user interface is adjustable, the backlight gear (first gear) is increased, and the actual backlight value (brightness) does not change.

[0148] In view of the above-mentioned current ramp-down function, in some embodiments, the projection device 2 also supports a low noise mode, in which the backlight gear of the projection device 2 is limited to a certain low backlight gear range. To this end, after detecting the laser temperature, the controller of the projection device 2 also detects the on-state of the low noise mode; if the on-state of the low noise mode is a disabled state, the step of obtaining the operating speed of the heat dissipation blade when the laser temperature is greater than or equal to the preset temperature threshold is performed (i.e., step S802). If the on-state of the low noise mode is an enabled state, the controller of the projection device 2 obtains the third temperature threshold, and sets the backlight value of the laser light source 100 according to the third temperature threshold.

[0149] That is to say, when the low noise mode of the projection device 2 is not turned on, the projection device 2 can execute the above-mentioned current slow-down function strategy; when the low noise mode of the projection device 2 is turned on, the projection device 2 determines whether the backlight value needs to be adjusted according to other temperature thresholds.

[0150] For example, the projection device 2 can project onto the projection surface Fig.15 The setting interface shown includes a low noise mode tab 1501, and the low noise mode tab 1501 includes a switch control 1502 for setting the low noise mode on state. The user can enable or disable the low noise mode through the switch control 1502.

[0151] For the low noise mode, in some embodiments, if the on state of the low noise mode is the enabled state, the controller of the projection device 2 can also be configured to: when the laser temperature is greater than or equal to the third temperature threshold, record the initial time point when the laser temperature is greater than or equal to the third temperature threshold. Then, taking the initial time point as the timing starting point, detect the laser temperature after the third time period; if the laser temperature is less than the third temperature threshold, perform the step of detecting the laser temperature of the laser light source; if the laser temperature is greater than or equal to the third temperature threshold, set the backlight value of the laser light source to the low noise backlight value, wherein the third temperature threshold is less than the first temperature threshold, and the low noise backlight value is less than the target value.

[0152] For example, Fig.16 As shown, the third temperature threshold is 45°C, the third time period is 10s, the first gear corresponding to the low noise backlight value is gear 3, and the low noise mode is enabled. Fig.14 In the second gear shown in FIG. 1 , the controller of the projection device 2 detects that the laser temperature is greater than or equal to 45° C., and is still greater than 45° C. after 10 seconds, the projection device 2 is set to Fig.14 As shown in the second gear, lower the second gear by one level every 2 seconds until the second gear reaches level 9, that is, the backlight value reaches 30.

[0153] It should be noted that the embodiments of the present application can Fig.16 The process shown is represented as a low noise slow-down mode. Some embodiments of the present application can uniformly represent the current slow-down mode and the low noise slow-down mode as a slow-down mode.

[0154] In some embodiments, when the low noise mode is turned on, the projection device 2 can also control the light output component to project the content of the second backlight setting interface to the projection surface in response to the display instruction of the backlight setting interface, so as to present the second backlight setting interface on the projection surface. The second backlight setting interface includes a selection control for setting the backlight value, and the option control of the second backlight setting interface is disabled, such as grayed out. For example, Fig.17 As shown, when the low noise mode is enabled, each backlight level in the backlight setting interface is set to a disabled state, that is, the backlight level cannot be adjusted by the user at this time, and the corresponding selection control 1701 is Fig.17 The grayed-out state is shown to remind the user that the function is currently disabled.

[0155] Based on the above-mentioned projection device 2, in some embodiments, the software of the projection device 2 is divided into a UI layer (user interface layer), a middleware biz layer (middle business layer), an avmain layer (audio and video main control layer) and a chassis layer (hardware control layer). Fig.18 As shown, the UI layer is used to provide the user with a user interaction interface for the low noise mode, and can send the start status message of the low noise mode to the middleware biz layer; the middleware biz layer is used to receive the start status message of the noise mode sent by the UI; at the same time, it receives the temperature information of the laser temperature, and triggers different slow-down functions according to the different laser temperatures; then, the slow-down mode and backlight gear information are sent to the avmain layer. The Avmain layer is used to receive the slow-down mode and backlight gear information sent by the middleware biz layer, and send it to the chassis layer. The chassis layer is used to receive the slow-down mode and backlight gear information sent by the avmain layer, and gradually adjust to the backlight value required by the slow-down mode according to the current backlight value of the projection device 2.

[0156] Exemplarily, the projection device 2 can be divided into the following three modes: current slow-down mode, used to realize the above-mentioned current slow-down function; UI backlight gear, used to realize the setting of the backlight gear displayed on the above-mentioned UI interface; low noise mode, used to realize the above-mentioned low noise slow-down function.

[0157]

[0158] Take the 15th level of backlight in the slow-down mode (the same is true for the 21st level of backlight in the slow-down mode) as an example. After the Laser component obtains the temperature information, it notifies the Video component to adjust the backlight. Fig.14 The corresponding relationship shown in the figure is as follows:

[0159] The controller of projection device 2 detects the laser temperature. When the laser temperature is ≥54°C, the backlight needs to be adjusted to level 15 out of 30 levels. The laser component sends mode type 0 and backlight level value = 15 to the video component. After receiving the message, the video component Fig.14 The corresponding relationship shown in the figure is used to calculate the backlight value m_NoMcuSlowDownMode=value*100 / 30=50, and then the backlight mode and backlight gear are sent to the avmain layer->chassis layer.

[0160] After receiving the backlight mode and backlight gear, the Chassis layer converts the received backlight value 50 (m_NoMcuSlowDownMode=value*100 / 30=50) into the slow-down gear m_LaserSlowDownVal=50*30 / 100=15 gears; at the same time, the state of the slow-down mode is determined according to m_LaserSlowDownVal:

[0161] When the current mode is slow-down mode 0 and the slow-down gear is 15, determine whether the backlight value tempValue of Laser LuminanceLevel in the current user mode is greater than the slow-down gear. If so, the current slow-down function (slow-down for short) is required, and the slow-down state (m_laserSlowDownMode) is recorded as 1. Otherwise, no slow-down is required, and the slow-down state is recorded as -1. The default value of the slow-down state is 0, that is, no slow-down has been performed during this startup.

[0162] When the current mode is slow-down mode 0 and the slow-down gear is 21, determine whether the Laser LuminanceLevel backlight value tempValue in the current user mode is greater than the slow-down gear. If so, slow-down is required and the slow-down state is recorded as 1. Otherwise, slow-down is not required and the slow-down state is recorded as -1. The default value of the slow-down state is 0, that is, no slow-down has been performed during this startup.

[0163] When the current mode is slow-down mode 2 and the slow-down gear is 9, determine whether the Laser LuminanceLevel backlight value tempValue in the current user mode is greater than the low-noise mode backlight gear. If so, low-noise processing is required and the low-noise mode state is recorded as 1. Otherwise, low-noise processing is not required and the low-noise mode state is recorded as -1. The default value of the low-noise mode state is 0, which means that no low-noise processing has been performed during this startup.

[0164] The current mode is slow-down mode 2. When the slow-down gear is 0, it is necessary to immediately stop adjusting the low-noise mode backlight and record the low-noise mode state as -1.

[0165] Based on the above-mentioned mode types and processing strategies, in some embodiments, the controller of the projection device 2 can perform backlight value settings under different mode types according to the following conditions: 1. The projection device 2 adjusts the backlight value according to the slow-down state and the low-noise state. When the slow-down state or the low-noise state is 1, the backlight value needs to be reduced from the current value to the target backlight level, such as 9, 15, and 21. After the slow-down, the user is allowed to adjust the backlight level through the interactive interface Laser Luminance Level. Only the backlight level less than or equal to the slow-down level will take effect, and the backlight level greater than the slow-down level will not take effect. Only the backlight level is recorded for this startup, and it will take effect next time it is started. 2. The low-noise mode of the projection device 2 is turned on, the temperature reaches 45°C, and the low-noise slow-down mode is triggered. The backlight level needs to be adjusted from the current backlight to the 9th level required by the low-noise mode. After the low-noise slow-down mode is triggered, the user is not allowed to adjust the backlight level through the interactive interface Low Noise Mode, and the interface is grayed out. After exiting low noise mode, that is, after the user turns off low noise mode through the interactive interface Low Noise Mode, the backlight gear needs to be restored to the state before entering low noise. 3. After exiting low noise mode, if the laser temperature reaches the temperature threshold of the current slow-down mode, the current slow-down function can also be triggered.

[0166] It should be noted that the specific gears, backlight values ​​and parameters described in the above embodiments are only some exemplary descriptions and are not intended to limit them.

[0167] Based on the above-mentioned projection device 2, some embodiments of the present application further provide a low-noise temperature control method, which can be applied to the projection device 2 provided in the above-mentioned embodiment, wherein the projection device 2 includes a light output component, a heat dissipation device and a controller, wherein the light output component, the heat dissipation device and the controller are coupled; the light output component includes a laser light source 100, and is configured to project projection content onto a projection surface based on the laser light source 100; the heat dissipation device includes heat dissipation blades, and is configured to control the rotation of the heat dissipation blades, and the operating speed of the heat dissipation blades is correlated with the laser temperature of the laser light source, and the operating speed includes at least a first speed and a second speed, and the first speed is greater than the second speed; Figure 8 As shown, the method comprises the following steps:

[0168] S801: In response to a power-on instruction, detecting the laser temperature of the laser light source.

[0169] S802: When the temperature of the laser is greater than or equal to a preset temperature threshold, obtaining the operating speed of the heat dissipation blade;

[0170] S803: If the operating speed is the first speed, setting the backlight value of the laser light source to a target value, so that the light output component projects the projection content according to the target value; the target value is less than the first backlight value of the laser light source when the power-on instruction is received;

[0171] S804: receiving a backlight adjustment instruction, and parsing a first gear position of the backlight adjustment instruction in response to the backlight adjustment instruction, where the first gear position is used to represent a second backlight value indicated by the backlight adjustment instruction;

[0172] S805: If the second backlight value is less than or equal to the target value, the backlight value of the laser light source is set to the second backlight value, so that the light output component projects the projection content according to the second backlight value.

[0173] It can be seen from the above technical solutions that the projection device and low-noise temperature control method provided by some embodiments of the present application can detect the laser temperature of the laser light source 100 in response to a power-on command. When the laser temperature is greater than or equal to the preset temperature threshold, the operating speed of the heat dissipation blade is obtained; if the operating speed is the maximum speed, the backlight value of the laser light source 100 is set to the target value, so that the light-emitting component projects the projection content according to the target value. Among them, the target value is less than the first backlight value of the laser light source 100 when the power-on command is received. Then receive the backlight adjustment command, and in response to the backlight adjustment command, parse the second backlight value indicated by the backlight adjustment command; if the second backlight value is less than or equal to the target value, set the backlight value of the laser light source to the second backlight value, so that the light-emitting component projects the projection content according to the second backlight value. The method can improve the overheating and noise problems of the projection device 2, extend the service life of the projection device 2, and improve the user experience.

[0174] 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.

[0175] 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, which can be stored in a storage medium such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes 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.

[0176] 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.

[0177] 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 output component, comprising a laser light source, and configured to project projection content onto a projection surface based on the laser light source; A heat dissipation device, comprising heat dissipation blades, and configured to control the rotation of the heat dissipation blades, wherein the operating speed of the heat dissipation blades is correlated with the laser temperature of the laser light source, and the operating speed includes at least a first speed and a second speed, and the first speed is greater than the second speed; A controller is coupled to the light output component and the heat dissipation device, and is configured as follows: In response to a power-on instruction, detecting a laser temperature of the laser light source; When the temperature of the laser is greater than or equal to a preset temperature threshold, obtaining the operating speed of the heat dissipation blade; If the operating speed is the first speed, setting the backlight value of the laser light source to a target value, so that the light emitting component projects the projection content according to the target value; The target value is less than the first backlight value of the laser light source when the power-on instruction is received; receiving a backlight adjustment instruction, and parsing a first gear position of the backlight adjustment instruction in response to the backlight adjustment instruction, wherein the first gear position is used to represent a second backlight value indicated by the backlight adjustment instruction; If the second backlight value is less than or equal to the target value, the backlight value of the laser light source is set to the second backlight value, so that the light output component projects the projection content according to the second backlight value.

2. The projection device according to claim 1, characterized in that: Before the controller executes the step of obtaining the operating speed of the heat dissipation blade, the controller is further configured to: Recording the initial time point when the laser temperature is greater than or equal to the preset temperature threshold; Taking the initial time point as the timing starting point, detecting the temperature of the laser after a first time period; If the laser temperature is less than the preset temperature threshold, performing the step of detecting the laser temperature of the laser light source; If the laser temperature is greater than or equal to the preset temperature threshold, the step of obtaining the operating rotation speed of the heat dissipation blade is performed.

3. The projection device according to claim 1, characterized in that: The preset temperature threshold includes a first temperature threshold and a second temperature threshold, and the first temperature threshold is less than the second temperature threshold; the controller sets the backlight value of the laser light source to a target value, and is specifically configured as follows: If the laser temperature is greater than or equal to the first temperature threshold but less than the second temperature threshold, and the operating speed is the first speed, setting the backlight value of the laser light source to a first target value; If the laser temperature is greater than or equal to a second temperature threshold, and the operating rotation speed is the first rotation speed, the backlight value of the laser light source is set to a second target value, and the second target value is less than the first target value.

4. The projection device according to claim 1, characterized in that: Before the controller executes the step of receiving the backlight adjustment instruction, the controller is further configured to: In response to a display instruction of a backlight setting interface, controlling the light emitting component to project the content of a first backlight setting interface onto the projection surface, wherein the first backlight setting interface includes a selection control for setting the backlight value, different selection controls are associated with different first gears, and the option control of the first backlight interface is in an enabled state; When a selection event of the selection control is detected, the backlight adjustment instruction is generated according to a first gear position associated with the selection control.

5. The projection device according to claim 1, characterized in that: The controller sets the backlight value of the laser light source to a target value, and is specifically configured as follows: Acquire a second gear corresponding to the backlight value; different second gears are associated with different backlight values, and the backlight values ​​associated with the second gears include the backlight value indicated by the first gear, and the number of the second gears is greater than the number of the first gears; The backlight value of the laser light source is set to the target value according to the second level and a preset decreasing gradient, wherein the decreasing gradient is to reduce the second level of the backlight value by 1 every second time period.

6. The projection device according to claim 1, characterized in that: After the controller executes the step of detecting the laser temperature of the laser light source, the controller is further configured to: Detect whether the low noise mode is on; If the low noise mode is in a disabled state, performing a step of obtaining the operating speed of the heat dissipation blade when the laser temperature is greater than or equal to a preset temperature threshold; If the on state of the low noise mode is an enabled state, a third temperature threshold is obtained, and a backlight value of the laser light source is set according to the third temperature threshold.

7. The projection device according to claim 6, characterized in that: If the low noise mode is in an enabled state, the controller is further configured to: When the laser temperature is greater than or equal to the third temperature threshold, recording an initial time point at which the laser temperature is greater than or equal to the third temperature threshold; Taking the initial time point as the timing starting point, detecting the temperature of the laser after a third time period has passed; If the laser temperature is less than the third temperature threshold, performing the step of detecting the laser temperature of the laser light source; If the laser temperature is greater than or equal to the third temperature threshold, the backlight value of the laser light source is set to a low noise backlight value, and the low noise backlight value is less than the target value.

8. The projection device according to claim 6, characterized in that: If the low noise mode is in an enabled state, the controller is further configured to: In response to a display instruction of the backlight setting interface, the light output component is controlled to project the content of a second backlight setting interface to the projection surface, the second backlight setting interface includes a selection control for setting the backlight value, and the option control of the second backlight setting interface is in a disabled state.

9. The projection device according to claim 1, characterized in that: After the controller executes the step of setting the backlight value of the laser light source to a target value, the controller is further configured to: In response to a shutdown instruction, recording the first backlight value, and executing a shutdown procedure of the projection device, wherein the shutdown procedure is used to shut down the projection device; receiving the power-on instruction; In response to the power-on instruction, reading the first recorded backlight value; The laser light source is set to the first backlight value, and the step of detecting the laser temperature of the laser light source is performed.

10. A low-noise temperature control method, characterized in that: Applied to a projection device, the projection device comprises a light emitting component, a heat sink and a controller, wherein the light emitting component, the heat sink and the controller are coupled; the light emitting component comprises a laser light source, and is configured to project projection content onto a projection surface based on the laser light source; the heat sink comprises a heat sink blade, and is configured to control the rotation of the heat sink blade, the operating speed of the heat sink blade is associated with the laser temperature of the laser light source, the operating speed comprises at least a first speed and a second speed, and the first speed is greater than the second speed; the method comprises: In response to a power-on instruction, detecting a laser temperature of the laser light source; When the temperature of the laser is greater than or equal to a preset temperature threshold, obtaining the operating speed of the heat dissipation blade; If the operating speed is the first speed, the backlight value of the laser light source is set to a target value, so that the light output component projects the projection content according to the target value; the target value is less than the first backlight value of the laser light source when the power-on instruction is received; receiving a backlight adjustment instruction, and parsing a first gear position of the backlight adjustment instruction in response to the backlight adjustment instruction, wherein the first gear position is used to represent a second backlight value indicated by the backlight adjustment instruction; If the second backlight value is less than or equal to the target value, the backlight value of the laser light source is set to the second backlight value, so that the light output component projects the projection content according to the second backlight value.

Images