Laser projection equipment, control method thereof and computer readable storage medium

Abstract

The invention discloses laser projection equipment, a control method thereof and a computer readable storage medium, and belongs to the technical field of photoelectricity. The laser projection equipment comprises a detection assembly, a control assembly and a laser projection assembly. The detection assembly is used for acquiring an infrared detection signal and sending the infrared detection signal to the control assembly; the control assembly is used for sending a first control signal to the laser projection assembly under the condition that the infrared detection signal meets the starting condition of the human eye protection function, the starting condition comprises that a signal parameter of the infrared detection signal is not smaller than a parameter threshold value, and the signal parameter comprises at least one of signal intensity, intensity change rate, signal energy and energy change rate; and the laser projection assembly is used for stopping projecting the display content under the condition that the first control signal is received. According to the scheme, the projection of the display content does not need to be stopped after waiting for the preset duration, but the projection of the display content is stopped immediately under the condition that the signal parameter meets the starting condition, so that the harm to human eyes can be reduced as much as possible.

Description

Laser projection device, control method thereof, and computer-readable storage medium

[0001] This application claims priority to Chinese patent application No. 202310903807.5 filed on July 21, 2023, entitled “Human Eye Protection Method for Laser Equipment, Laser Equipment”, priority to Chinese patent application No. 202311463395.4 filed on November 6, 2023, entitled “Laser Projection Equipment and Control Method for Laser Projection Equipment”, and priority to Chinese patent application No. 202311852100.2 filed on December 28, 2023, entitled “Laser Projection Equipment and Human Eye Protection Method”, all of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of optoelectronic technology, and in particular to a laser projection device, a control method thereof, and a computer-readable storage medium. Background Art

[0003] A laser projection device is a device that uses lasers to project images or videos onto projection media such as screens and curtains for display. Normally, a certain projection distance is reserved between the laser projection device and the projection medium to achieve a better projection size and experience. The reserved projection distance provides the possibility for users to enter or pass through the laser projection area (that is, the area between the laser projection device and the projection medium). During the operation of the laser projection device, if the user enters the laser projection area, the laser projected by the laser projection device is likely to irradiate the user's eyes, causing damage to the human eyes. Based on this, it is necessary to control the laser projection device to reduce laser damage to the eyes.

[0004] Summary of the Invention

[0005] This application provides a laser projection device, a control method thereof, and a computer-readable storage medium, which can be used to reduce damage to human eyes caused by laser projection devices. The technical solution is as follows:

[0006] In a first aspect, a laser projection device is provided, comprising: a detection component, a control component, and a laser projection component;

[0007] The detection component is used to obtain infrared detection signals within a detection range and send the infrared detection signals to the control component, wherein the detection range includes the laser projection area;

[0008] The control component is configured to send a first control signal to the laser projection component when the infrared detection signal meets a condition for enabling a human eye protection function, wherein the condition for enabling the function includes a signal parameter of the infrared detection signal being not less than a parameter threshold, and the signal parameter includes at least one of signal intensity, intensity change rate, signal energy, and energy change rate;

[0009] The laser projection component is configured to stop projecting display content upon receiving the first control signal.

[0010] In a second aspect, a control method for a laser projection device is provided, the method comprising:

[0011] Acquiring an infrared detection signal within a detection range, wherein the detection range includes a laser projection area;

[0012] When the infrared detection signal meets the activation conditions of the human eye protection function, the projection of the display content is stopped. The activation conditions include that the signal parameter of the infrared detection signal is not less than the parameter threshold, and the signal parameter includes at least one of signal intensity, intensity change rate, signal energy, and energy change rate.

[0013] In a third aspect, a control device for a laser projection device is provided, the control device comprising:

[0014] an acquisition module, configured to acquire infrared detection signals within a detection range, wherein the detection range includes a laser projection area;

[0015] A stop module is used to stop projecting and displaying content when the infrared detection signal meets the activation conditions of the human eye protection function, wherein the activation conditions include that the signal parameter of the infrared detection signal is not less than the parameter threshold, and the signal parameter includes at least one of signal strength, intensity change rate, signal energy, and energy change rate.

[0016] In a fourth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by a processor to implement the control method of the laser projection device provided in the second aspect above.

[0017] In a fifth aspect, a computer program product is provided, wherein the computer program product includes program instructions, and when the program instructions are executed by a processor, the control method of the laser projection device provided in the second aspect is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] FIG1 is a schematic diagram of a side view of the positions of a projection screen and a laser projection device provided by an embodiment of the present application;

[0020] FIG2 is a schematic diagram of a front view of the positions of a projection screen and a laser projection device provided in an embodiment of the present application;

[0021] FIG3 is a schematic diagram of Fresnel patterns of an arc-shaped Fresnel lens provided in an embodiment of the present application;

[0022] FIG4 is a schematic diagram of the detection range of a circular arc Fresnel lens provided in an embodiment of the present application;

[0023] FIG5 is a schematic diagram of the installation position of an arc-shaped Fresnel lens according to an embodiment of the present application;

[0024] FIG6 is a schematic diagram of the installation position of another Fresnel lens provided in an embodiment of the present application;

[0025] FIG7 is a schematic diagram of an application scenario applicable to an embodiment of the present application;

[0026] FIG8 is a schematic diagram of a scene of laser projection display provided by an embodiment of the present application;

[0027] FIG9 is a schematic structural diagram of a laser projection device provided in an embodiment of the present application;

[0028] FIG10 is a schematic structural diagram of another laser projection device provided in an embodiment of the present application;

[0029] FIG11 is a schematic structural diagram of another laser projection device provided in an embodiment of the present application;

[0030] FIG12 is a waveform diagram of output signals of a detection component and a control component provided in an embodiment of the present application;

[0031] FIG13 is a schematic structural diagram of another laser projection device provided in an embodiment of the present application;

[0032] FIG14 is a schematic structural diagram of another laser projection device provided in an embodiment of the present application;

[0033] FIG15 is a schematic structural diagram of another laser projection device provided in an embodiment of the present application;

[0034] FIG16 is a schematic structural diagram of another laser projection device provided in an embodiment of the present application;

[0035] FIG17 is a schematic structural diagram of another laser projection device provided in an embodiment of the present application;

[0036] FIG18 is a schematic structural diagram of another laser projection device provided in an embodiment of the present application;

[0037] FIG19 is a schematic diagram of multiple detection elements provided in an embodiment of the present application;

[0038] FIG20 is a schematic diagram of another laser projection display scene provided by an embodiment of the present application;

[0039] FIG21 is a schematic diagram of another laser projection display scene provided by an embodiment of the present application;

[0040] FIG22 is a schematic diagram of another laser projection display scene provided by an embodiment of the present application;

[0041] FIG23 is a waveform diagram of a detection signal provided in an embodiment of the present application;

[0042] FIG24 is a schematic diagram of a binary number of a detection signal provided in an embodiment of the present application;

[0043] FIG25 is a schematic structural diagram of another laser projection device provided in an embodiment of the present application;

[0044] FIG26 is a schematic structural diagram of another laser projection device provided in an embodiment of the present application;

[0045] FIG27 is a schematic structural diagram of another laser projection device provided in an embodiment of the present application;

[0046] FIG28 is a schematic diagram of the structure of a dual-element sensitive element provided in an embodiment of the present application;

[0047] FIG29 is a schematic diagram of a first motion direction provided by an embodiment of the present application;

[0048] FIG30 is a schematic structural diagram of another laser projection device provided in an embodiment of the present application;

[0049] FIG31 is a schematic diagram of signal strength values ​​corresponding to multiple read cycles according to an embodiment of the present application;

[0050] FIG32 is a schematic diagram of children and adults within the detection range in an embodiment of the present application;

[0051] FIG33 is a schematic diagram of the signal strength corresponding to children and adults in an embodiment of the present application;

[0052] FIG34 is a schematic diagram of the structure of a planar converging lens on a laser projection device provided by an embodiment of the present application;

[0053] FIG35 is a schematic diagram of a Fresnel lens including incomplete planar Fresnel patterns provided in an embodiment of the present application;

[0054] FIG36 is a schematic diagram showing the positional relationship between a lens and a converging lens provided in an embodiment of the present application;

[0055] FIG37 is a schematic diagram showing the positional relationship between another lens and a converging lens provided in an embodiment of the present application;

[0056] FIG38 is a schematic diagram of a detection range in a side view provided in an embodiment of the present application;

[0057] FIG39 is a schematic diagram of a detection range under a normal view provided in an embodiment of the present application;

[0058] FIG40 is a schematic structural diagram of another laser projection device provided in an embodiment of the present application;

[0059] FIG41 is a schematic structural diagram of another laser projection device provided in an embodiment of the present application;

[0060] FIG42 is a flow chart of a method for controlling a laser projection device according to an embodiment of the present application;

[0061] FIG43 is a flowchart of another method for controlling a laser projection device provided in an embodiment of the present application;

[0062] FIG44 is a flowchart of another method for controlling a laser projection device provided in an embodiment of the present application;

[0063] FIG45 is a flowchart of another method for controlling a laser projection device provided in an embodiment of the present application;

[0064] FIG46 is a flowchart of another method for controlling a laser projection device provided in an embodiment of the present application;

[0065] Figure 47 is a flowchart of another control method for a laser projection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0066] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode 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, not all of the embodiments.

[0067] All other embodiments derived by persons of ordinary skill in the art based on the exemplary embodiments described herein without inventive effort are within the scope of protection of the claims appended hereto. Furthermore, although the disclosure herein is presented based on one or more exemplary embodiments, it should be understood that each aspect of the disclosure may constitute a complete embodiment on its own.

[0068] It should be noted that the brief descriptions of terms in this application are only for the purpose of facilitating the understanding of the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their ordinary and usual meanings.

[0069] In the specification, claims, and drawings of this application, the terms "first," "second," "third," and the like are used to distinguish similar or similar objects or entities, and are not necessarily intended to limit a particular order or precedence, unless otherwise indicated. It should be understood that such terms are interchangeable where appropriate, e.g., they can be implemented in an order other than that shown or described in the drawings or descriptions of the embodiments of this application.

[0070] In addition, the terms "comprises" and "comprising" 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 those components expressly listed but may include other components not expressly listed or inherent to such product or device.

[0071] To facilitate understanding, the background knowledge involved in the embodiments of this application is first introduced.

[0072] A laser projection device uses laser light to project images or videos onto a screen, curtain, or other projection medium. Laser projection devices can also be referred to as projection devices, laser devices, or display devices. Currently, laser projection devices such as laser projection TVs and laser projectors are widely used in homes, offices, schools, and entertainment venues.

[0073] Current laser projection systems include short-throw and long-throw devices. Examples of short-throw devices include ultra-short-throw projectors, ultra-short-throw TVs, and ultra-short-throw devices. The terms "short-throw" and "long-throw" describe the distance between the laser projector and the projection medium. Short-throw devices are typically placed closer to the projection medium, such as on a TV stand. Long-throw devices, on the other hand, are typically placed farther from the projection medium, such as on a tabletop or mounted on the ceiling.

[0074] For long-distance projection equipment, the reserved projection distance between the laser projector and the projection medium is relatively large, and the user must stand between the laser projector and the projection medium to view the projected image. During operation, if the user enters the laser projection area (between the laser projector and the projection medium) of the laser projector, the laser projected by the laser projector is likely to shine into the user's eyes, causing damage.

[0075] For short-throw projection equipment, the reserved projection distance between the laser projection equipment and the projection medium is relatively small, but the laser projection area includes the area directly in front of the laser projection equipment, the area to the left, and the area to the right of the projection medium. Although the possibility of the laser irradiating the human eye is relatively small when the user stands in the area directly in front of the laser projection equipment with his back to the projection medium, if the user walks to the above-mentioned left or right area, the laser is still likely to irradiate the user's eyes.

[0076] Taking laser TV as an example, a laser TV consists of a projection screen and a laser projection device. The laser projection device projects images onto the projection screen, allowing for video playback on the projection screen. However, when watching videos, users may be close to the laser projection device, which could potentially damage their eyes.

[0077] The positions of the projection screen and the laser projection device can be seen in Figures 1 and 2. Figure 1 is a schematic diagram of a side view of the positions of a projection screen and a laser projection device provided in an embodiment of the present application. Figure 2 is a schematic diagram of a front view of the positions of a projection screen and a laser projection device provided in an embodiment of the present application.

[0078] As shown in Figures 1 and 2, a laser projection device can emit a laser beam (also referred to as a laser beam, or simply laser) toward a projection screen to play a video on the projection screen. The user's viewing direction is toward the projection screen. While the laser projection device is emitting laser light to play a video on the projection screen, if a user approaches the laser projection device and is relatively close to the laser projection device, the laser light emitted by the laser projection device may cause damage to the user's eyes.

[0079] To prevent laser projection equipment from causing eye damage, related technologies use pyroelectric sensors to detect users entering the laser projection area. Specifically, the pyroelectric sensor converts infrared light from the human body into a pulse signal. The sensor then determines whether a user has entered the laser projection area based on the number of pulses (referred to as the pulse count) within a preset duration (or unit time). If a user enters the laser projection area, the sensor turns off the laser or reduces the brightness of the laser.

[0080] Among them, the pyroelectric sensor converts the received infrared light from the human body (also known as a trigger signal) into a weak electrical signal, uses an amplifier (such as an operational amplifier, also known as a power amplifier) ​​to amplify the weak electrical signal, outputs the signal to the transistor through a comparator, and converts it into a pulse signal. The MCU (Microcontroller Unit) determines whether to trigger the human eye protection function based on the number of pulses per unit time, thereby controlling the laser to turn off or reduce the brightness of the laser emitted by the laser.

[0081] However, since the relevant technology needs to determine whether a human body has invaded the laser projection area of ​​the laser projection device based on the number of pulses of the pulse signal within a preset time length, the laser projection device is still in working condition during the preset time length when the user enters the laser projection area, and may still cause damage to the human eyes.

[0082] Based on this, embodiments of the present application provide a laser projection device and control method thereof, which can immediately stop projecting displayed content after a user enters the laser projection area, without waiting for a preset time, thereby minimizing damage to the human eye. Specific implementation methods will be described in detail later.

[0083] Furthermore, the related art relies solely on pulse signals for judgment, failing to determine signal strength or the user's direction of movement. This can easily lead to misjudgments. For example, if the number of pulses during a user's movement away from the laser device meets the conditions for triggering the eye protection function, the function is triggered and the laser is turned off. This is a misjudgment, which can affect the user's normal viewing experience. Furthermore, determining whether to trigger the eye protection function based on the number of pulses results in high detection sensitivity. This makes it more likely that the user will trigger the eye protection function when approaching or passing by the projection device at a distance, leading to lower judgment accuracy. Frequent triggering of the eye protection function can cause the screen to shut off, impacting the viewer's normal viewing experience.

[0084] Based on this, the laser projection device and control method thereof provided in the embodiment of the present application can also reduce misjudgment on the basis of minimizing damage to the human eye, that is, improve the accuracy of judgment, reduce the possibility of frequently triggering the human eye protection function and causing the screen to turn off, and improve the user's viewing experience. For example, by obtaining the detection signal of multiple consecutive reading cycles, it is possible to judge the state of the user in multiple reading cycles (far away from the laser projection device, or close to the laser projection device) based on the detection signal, and then determine whether to stop projecting the display content based on the state and the signal parameters of the detection signal (such as intensity, energy or energy change rate, etc.). The specific implementation method will be described in detail later.

[0085] Then, the judgment conditions in the relevant technology only include the number of pulses per unit time, so only the number of pulses within the preset time length can be changed to change the judgment conditions and then change the detection performance, but the judgment conditions cannot be changed according to different user needs (for example, whether the user is an adult or a child, the user's movement speed, etc.).

[0086] Based on this, the laser projection device and control method provided in the embodiments of the present application can also adaptively change the judgment conditions (such as the conditions for enabling the human eye protection function) according to different user needs. The specific implementation method will be described in detail later.

[0087] As can be seen from the above, a sensor (such as a pyroelectric sensor) can be used to detect human proximity, thereby reducing laser damage to the human eye. To improve the detection effect of the sensor, the related technology adds a Fresnel lens with an arc-shaped protrusion above the sensor. The three-dimensional structure of the Fresnel lens with an arc-shaped cross-section is a spherical protrusion. In some embodiments, the Fresnel lens with an arc-shaped protrusion can be simply referred to as an arc-shaped Fresnel lens. The Fresnel lens can focus the infrared light emitted by the human body on the receiving surface of the sensor, thereby detecting the presence of a person within a certain range.

[0088] Different areas of a Fresnel lens have different refractive indices. When a heat source moves, the infrared light emitted by the heat source passes through different areas of the Fresnel lens. Due to the different refractive indices of these areas, the infrared light received by the sensor alternates, creating a grating effect. This causes the sensor's output signal level to vary, thus enabling human proximity detection based on this varying level. The different areas of the Fresnel lens are represented by Fresnel patterns. For a detailed introduction to Fresnel patterns, please refer to related literature. This article will not cover this in detail. The working principle of a Fresnel lens can also be referenced in related literature. This article will not elaborate on this in detail.

[0089] The Fresnel patterns on the arcuate Fresnel lens can be seen in Figure 3, which is a schematic diagram of the Fresnel patterns of an arcuate Fresnel lens provided in an embodiment of the present application. The Fresnel patterns of the arcuate Fresnel lens shown in Figure 3 are only one possible existing arrangement and do not constitute any limitation.

[0090] The detection range of the arc-shaped Fresnel lens can be seen in Figure 4, which is a schematic diagram of the detection range of an arc-shaped Fresnel lens provided in an embodiment of the present application. As shown in Figure 4, the detection range of the arc-shaped Fresnel lens is conical.

[0091] Taking the installation of two arc-shaped Fresnel lenses on a laser projection device as an example, the installation positions of the two arc-shaped Fresnel lenses are shown in Figure 5. Figure 5 is a schematic diagram of the installation position of an arc-shaped Fresnel lens provided in an embodiment of the present application.

[0092] As shown in FIG5 , when installing two arc-shaped Fresnel lenses, holes need to be opened on the surface of the laser projection device so that the two arc-shaped Fresnel lenses can be installed on the laser projection device. Since the arc-shaped Fresnel lenses are arc-shaped protrusions, bulges will be formed on the laser projection device, which may make the appearance of the laser projection device uneven and affect the appearance of the laser projection device.

[0093] In other implementations, the arc-shaped Fresnel lens is installed on the laser projection device in a hidden manner. Specifically, the arc-shaped Fresnel lens is sunk into the interior of the laser projection device, and an infrared filter is placed above the arc-shaped Fresnel lens. The infrared filter is flush with the outer shell of the laser projection device, resulting in a flat appearance of the laser projection device. Taking the installation of two arc-shaped Fresnel lenses on the laser projection device as an example, the hidden installation method of the two arc-shaped Fresnel lenses is shown in Figure 6. Figure 6 provides a schematic diagram of another installation position of the Fresnel lens in an embodiment of the present application.

[0094] However, in this possible implementation, the surface of the arcuate Fresnel lens acts as an infrared filter. By adding an infrared filter over the arcuate protrusion of the Fresnel lens, infrared light emitted by the human body passes through two layers of filters before reaching the sensor inside the laser projection device. This can cause the infrared light received by the sensor to attenuate, resulting in poor detection accuracy. Furthermore, sinking the arcuate Fresnel lens into the interior of the laser projection device results in it occupying a large space inside the laser projection device.

[0095] Based on this, an embodiment of the present application provides a laser projection device, on which a converging lens with a planar structure is installed, and the plane on which the converging lens is located is parallel to the plane on which the lens of the laser projection device is located. In this way, since the converging lens is a planar structure, no protrusion will be formed on the laser projection device, thereby improving the aesthetics of the laser projection device. Moreover, since the thickness of the converging lens with a planar structure is less than the thickness of the arc-shaped Fresnel lens, the use of a converging lens with a planar structure can reduce the internal space occupied by the laser projection device.

[0096] Next, the application scenarios to which the embodiments of the present application are applicable are described.

[0097] FIG7 is a schematic diagram of an application scenario applicable to an embodiment of the present application. As shown in FIG7 , the scene displayed by the laser projection device may include a housing 00 and a display screen 02 .

[0098] The housing 00 is used to project laser light (also referred to as an image beam) onto the display screen 02 to display a projection image on the display screen 02. It should be understood that projecting laser light is projecting display content, which can also be referred to as a display image, a display image, projected content, or a projected image.

[0099] Housing 00 includes a detection assembly, a control assembly (also referred to as a display control assembly), and a laser projection assembly (also referred to as a laser assembly) in the embodiment of the present application. The detection assembly is used to obtain the signal reflected by target object 01 and output it to the control assembly. The control assembly is used to control the laser projection assembly based on the signal output by the detection assembly. The laser projection assembly is used to turn on, off, adjust the brightness, etc. under the control of the control assembly.

[0100] The signal reflected by the target object 01 may be an infrared detection signal, and the laser projection device may determine whether to turn on the human eye protection function based on the infrared detection signal to stop projecting the display content.

[0101] It should be noted that in the embodiments of the present application, the detection component includes an infrared sensor as an example to detect the human body or other moving objects, that is, the signal obtained by the detection component is an infrared detection signal. In other embodiments, radar, time of flight (TOF) sensors, image sensors, or a combination of multiple sensors may also be used to detect the human body or other living animals. The following description of this solution uses the example of the signal obtained by the detection device being an infrared detection signal.

[0102] The state of the target object 01 shown in Figure 7 is that it is close to the laser device. At this time, since the human eye can easily enter the range of the light outlet of the shell 00, it is easy to cause damage to the human eye. Therefore, the laser projection device needs to detect the target object 01, thereby triggering the human eye protection function, that is, turning off the laser in the shell 00 to stop emitting light.

[0103] FIG8 shows a schematic diagram of a laser projection display scene in some embodiments of the present application. The laser projection display scene includes: a laser projection device 801 and a projection medium 802. In one specific implementation, it also includes at least one of a mobile terminal 803 and a control device 804. The projection of the laser projection area of ​​the laser projection device 801 is consistent with the display surface of the projection medium 802. The laser projection device 801 can be connected to a computer, a broadcasting network, the Internet, a video compact disc (VCD), a digital video disc (DVD), a game console, a digital video camera (DV), and other devices through different interfaces to receive projection content such as images, videos, and text, and project the projection content onto the projection medium 802 formed by a physical body such as a wall, a curtain, or a screen. The user can operate the laser projection device 801 through the mobile terminal 803 or the control device 804 to control the laser projection device 801, or can control the laser projection device 801 through the buttons on the laser projection device 110. The laser projection device 801 may be a host (also referred to as a housing) of a laser TV, and the projection medium 802 may be a projection screen (also referred to as a screen) of the laser TV. The mobile terminal 803 may be a mobile phone, tablet, or the like, and the control device 804 may be a remote control. Communication between the mobile terminal 803 and the control device 804 and the laser projection device 801 may include infrared protocol communication, Bluetooth protocol communication, or communication using other protocols. The mobile terminal 803 and the control device 804 control the laser projection device 801 wirelessly or through other wired means. The user may input user commands through physical buttons, voice input, a control panel, or the like on the mobile terminal 803 or the control device 804, and control the laser projection device 801 through user commands.

[0104] FIG9 is a schematic diagram of a laser projection device provided in an embodiment of the present application. As shown in FIG9 , after the upper shell of the laser projection device is disassembled, its internal structure is divided according to optical functions, and may include a light source assembly 100, an optical engine 200, a lens 300, etc. Among them, the light source assembly 100 is used to provide a light beam, which is transmitted to the rear-end light modulation device and the projection lens. The light source assembly 100 may include a light source assembly of at least one color, such as a blue light source assembly, or a two-color light source assembly, such as a blue light source assembly and a red light source assembly, or a three-color laser light source, including light source assemblies of three colors: red, green, and blue, for providing three-color laser modulated light.

[0105] The laser beam provided by the light source assembly 100 is incident on the illumination optical path portion of the optical engine 200 after light combination and shaping. In the digital light processing (DLP) projection architecture, the light modulation assembly chip is the core light modulation device.

[0106] Exemplarily, the light modulation component may be a digital micromirror device (DMD), which may reflect the light beam irradiating its surface into the lens 300 .

[0107] In a specific implementation, the light source assembly 100 may be part or all of the laser projection assembly in the embodiment of the present application.

[0108] The lens 300 may be an ultra-short-throw projection lens, which is used to project an image beam onto a projection screen, thereby realizing a projected image display. The laser projection device in the above example may be an ultra-short-throw laser projection device (also known as an ultra-short-throw projection device).

[0109] FIG10 is a schematic diagram of the structure of a laser projection device in some embodiments of the present application. As shown in FIG10 , the laser projection device includes: a detection component 41 , a control component 42 and a laser projection component 43 .

[0110] The detection component 41 is used to obtain infrared detection signals within a detection range and send the infrared detection signals to the control component 42. The detection range includes the laser projection area.

[0111] The control component 42 is used to send a first control signal to the laser projection component 43 when the infrared detection signal meets the activation conditions of the human eye protection function. The activation conditions include that the signal parameters of the infrared detection signal are not less than the parameter threshold, and the signal parameters include at least one of signal intensity, intensity change rate, signal energy, and energy change rate.

[0112] The laser projection assembly 43 is configured to stop projecting display content upon receiving a first control signal.

[0113] In this way, when the infrared detection signal meets the conditions for turning on the human eye protection function, the projection of the display content can be stopped. There is no need to obtain a pulse signal of a preset duration as in the related art, and then judge whether the number of pulses of the preset duration meets the conditions. That is, this solution does not need to wait for the preset duration before stopping the projection of the display content, so that the projection can be stopped as soon as possible to minimize damage to the human eye.

[0114] In one embodiment, the control component 42 is further configured to send a second control signal to the laser projection component 43 when the infrared detection signal meets the activation condition of the human eye protection function. The laser projection component 43 is further configured to project the display content when receiving the second control signal.

[0115] In some embodiments, the detection component 41 may be an infrared pyroelectric sensor (also known as a thermal infrared sensor, infrared sensor, etc.). An infrared pyroelectric sensor is a sensor that uses infrared pyroelectric technology to detect human presence. Because the human body has a constant body temperature, it emits infrared radiation of a specific wavelength (approximately 10 μm). When the infrared pyroelectric sensor detects changes in the temperature of the human body's infrared radiation, it loses charge balance and releases charge to form an infrared detection signal.

[0116] In particular, if the detected infrared radiation temperature of the human body changes at a significant rate, the energy and intensity change rates of the infrared detection signal are both relatively large. If the detected infrared radiation temperature of the human body does not change, or changes but at a small rate, there may be no infrared detection signal, or the various parameters of the infrared detection signal may be relatively weak. In other words, the detection component 41 may not always output an infrared detection signal, but may only output an infrared detection signal when the infrared radiation temperature of the human body changes at a significant rate.

[0117] Based on this, if the control component 42 does not receive an infrared detection signal, it indicates that the signal parameter of the infrared detection signal is 0, and the activation condition of the human eye protection function is not met. The control component 42 then sends a second control signal to the laser projection component 43. If the control component 42 receives an infrared detection signal, it indicates that the rate of change of the infrared radiation temperature of the human body is large. The infrared detection signal at this time meets the activation condition of the human eye protection function, and the control component 42 then sends a first control signal to the laser projection component 43. Alternatively, to avoid false triggering, the control component 42 first determines whether the infrared detection signal meets the activation condition, and then determines whether to send the first control signal or the second control signal to the laser projection component 43.

[0118] The following description will take the example of the control component 42 sending the first control signal to the laser projection component 43 upon receiving the infrared detection signal. That is, upon receiving the infrared detection signal, it is assumed that the infrared detection signal satisfies the activation condition, and the control component 42 does not need to perform the operation of determining whether the infrared detection signal satisfies the activation condition.

[0119] In a specific implementation, when the energy change rate and / or intensity change rate of the infrared detection signal is relatively large, the infrared detection signal output by the detection component 41 is similar to a pulse signal, or can be regarded as a pulse signal.

[0120] In one specific implementation, referring to FIG11 , the control component 42 includes a first control component 421 and a second control component 422. The first control component 421 is configured to send a pulse signal to the second control component 422 when the infrared detection signal satisfies the activation condition. The second control component 422 is configured to send a second level signal to the laser projection component 43 upon receiving the pulse signal sent by the first control component 421. The first control signal is the second level signal. The pulse signal here can be a pulse signal obtained by processing the infrared detection signal, or an unprocessed infrared detection signal in the form of a pulse, or other pulse signal. The pulse signal here is taken as an example to be introduced later.

[0121] In one specific implementation, the second control component 422 is further configured to send a first level signal to the laser projection component 43 when it does not receive the pulse signal sent by the first control component 421. The second control signal is the first level signal. The laser projection component 43 is further configured to project display content when it receives the first level signal.

[0122] The laser projection component 43 is specifically configured to obtain the duration of the first level signal if the received first level signal is switched from the second level signal, and project display content if the duration of the first level signal is not less than a time length threshold.

[0123] To put it another way, in some embodiments, the laser projection assembly 43 is further configured to:

[0124] After the output signal of the control component 42 is switched from the second level signal to the first level signal, the duration of the first level signal is obtained in real time, and when the duration of the first level signal is greater than or equal to a threshold time length (also referred to as a time length threshold), the display content continues to be projected.

[0125] Exemplarily, the threshold time length may be 2 seconds, 3 seconds, or 5 seconds, or other time values.

[0126] In some embodiments, the laser projection component 43 may start a timer with a threshold time length when the output signal of the control component 42 switches from the second level signal to the first level signal, and continue to project the display content after the timer times out.

[0127] Since in the embodiment of the present application, after the output signal of the control component 42 is switched from the second level signal to the first level signal, the laser projection component 43 will not immediately resume the projected display content, but will wait for a threshold time length before resuming the projected display content. Therefore, the above embodiment can also avoid resuming the projected display content when the user has not left the laser projection area, thereby further avoiding laser irradiation to the eyes.

[0128] In one specific implementation, the first level signal is a high level, and the second level signal is a low level. Alternatively, the first level is a low level, and the second level is a high level.

[0129] For example, when a human body enters the laser projection area at time t1, the waveforms of the output signals of the detection component and the control component can be shown in FIG12. As shown in FIG12, before time t1, the pyroelectric infrared energy in the laser projection area is stable, the output signal 51 of the detection component is empty (no signal output), and the control component does not receive the signal sent by the detection component (such as a pulsed infrared detection signal). Therefore, the output signal 52 of the control component is a first level signal. At time t1, because the human body enters the laser projection area, the rate of change of the pyroelectric infrared energy in the laser projection area is large. Therefore, the detection component outputs an infrared detection signal (such as a pulse signal). After the control component receives the infrared detection signal, because the signal parameters of the infrared detection signal (such as the energy change rate) usually exceed the parameter threshold, the control component outputs a second level signal.

[0130] In one specific implementation, as shown in FIG12 , the control component outputs a second level signal of a first duration. After outputting the second level signal of the first duration, if the infrared detection signal received at this time does not meet the aforementioned activation condition, the control component re-outputs the first level signal. If the infrared detection signal received at this time meets the aforementioned activation condition, the control component continues to output the second level signal. The first duration can be, for example, 3 seconds, 5 seconds, or other time values.

[0131] The laser projection component 43 is configured to project display content through laser when the control component 42 outputs a first level signal, and to stop projecting the display content when the control component outputs a second level signal.

[0132] As described in the above example, before time t1, the output signal 52 of the control component is a first level signal, so the laser projection component 43 projects the display content to the laser projection area through the laser; within the first time period after time t1, the output signal 52 of the control component is a second level signal, so the laser projection component 43 stops projecting the display content to the laser projection area.

[0133] In some embodiments, the laser projection component 43 is further configured to output a reminder message (also referred to as a prompt message) when the control component 42 outputs the second level signal. The reminder message is used to indicate that a user is within the laser projection area of ​​the laser projection device, that is, to remind the user to stay away from the laser projection device.

[0134] In some embodiments, the reminder information can be at least one of a voice reminder information, a graphic reminder information, and a light reminder signal light.

[0135] Next, please refer to Figures 13 to 16 to exemplarily introduce the structure of the above-mentioned control component 42.

[0136] 13 , in some embodiments, the control component 42 includes: a signal output component, a control chip 422 , and an output component 423 .

[0137] The signal output component is used to process the infrared detection signal. For example, the signal output component includes at least one of the analog to digital converter (ADC) 421 shown in FIG14 , the power amplifier 424 shown in FIG15 , and the bandpass filter 425 shown in FIG16 .

[0138] The analog-to-digital converter 421 in FIG. 14 is configured to convert the infrared detection signal from an analog signal into a digital signal, and send the digital signal to the control chip 422 .

[0139] The control chip 422 is configured to output a third level signal to the output component 423 when the digital signal sent by the analog-to-digital converter 421 is not received, and to output a fourth level signal, such as a fourth level signal of the first duration, to the output component 423 when the digital signal sent by the analog-to-digital converter 421 is received.

[0140] The output component 423 is configured to output a first level signal to the laser projection component 43 when the control chip 422 outputs a third level signal, and to output a second level signal to the laser projection component 43 when the control chip 422 outputs a fourth level signal.

[0141] In some embodiments, as shown in FIG. 15 , the control component 42 further includes a power amplifier 424 .

[0142] The power amplifier 424 is configured to perform power amplification processing on the infrared detection signal before the analog-to-digital converter 421 converts the infrared detection signal from an analog signal to a digital signal.

[0143] Performing power amplification processing on the infrared detection signal before converting the infrared detection signal from an analog signal to a digital signal can increase the power of the infrared detection signal, thereby avoiding the infrared detection signal being unable to be effectively converted into a digital signal.

[0144] 16 , in some embodiments, the control component 42 further includes a bandpass filter 425 .

[0145] The bandpass filter 425 is configured to filter the infrared detection signal after power amplification before the analog-to-digital converter 424 converts the infrared detection signal from an analog signal to a digital signal.

[0146] By filtering the infrared detection signal after power amplification through the bandpass filter 425 , noise in the infrared detection signal after power amplification can be filtered out, thereby avoiding false triggering.

[0147] The bandpass filter 425 may also be other possible types of filters as long as it has the function of filtering out noise.

[0148] It should be understood that the power amplifier 424, bandpass filter 425, and analog-to-digital converter 421 are all optional components. For example, in some embodiments, the control component 42 includes the bandpass filter 425 and the analog-to-digital converter 421, but does not include the power amplifier 424. The following description uses the example of the control component 42 including the power amplifier 424, the bandpass filter 425, and the analog-to-digital converter 421.

[0149] Furthermore, in some embodiments, the infrared detection signal may be filtered before being amplified. In other embodiments, the infrared detection signal may be amplified before being filtered. In summary, the embodiments of the present application do not limit the order in which the infrared detection signal is subjected to multiple processing operations.

[0150] 17 , in some embodiments, the output component 423 is a field effect transistor 900. The source S of the field effect transistor 900 is connected to the first level terminal V1 and the laser projection component 43, the drain D of the field effect transistor 900 is connected to the second level terminal V2, and the gate G of the field effect transistor 900 is connected to the control chip 422 via a current limiting resistor R.

[0151] The field effect transistor 900 is configured to disconnect the electrical connection between the source S and the drain D of the field effect transistor 900 when the control chip 422 outputs a third level signal to the gate G of the field effect transistor 900 through the current limiting resistor R, so as to output a first level signal to the laser projection component 43; and to connect the electrical connection between the source S and the drain D of the field effect transistor 900 when the control chip 422 outputs a fourth level signal to the gate D of the field effect transistor 900 through the current limiting resistor R, so as to output a second level signal to the laser projection component 43.

[0152] In some embodiments, the voltage of the first level end is 3.3V (volts), and the second level end is ground. In other embodiments, the voltage of the first level end may be 5V or other voltage values, and the second level end may not be ground. The voltage of the second level end may be lower than the voltage of the first level end, for example, the voltage of the second level end is 0.6V.

[0153] In the laser projection devices shown in Figures 13 to 17 above, part or all of the signal output component is integrated into the control component. In other embodiments, the signal output component may not be integrated into the control component. For example, the laser projection device includes a detection component, a signal output component, a control component, and a laser projection component.

[0154] In some embodiments, as shown in FIG18 , the laser projection assembly 43 includes: a mainboard 431 and a laser 432 ;

[0155] Main board 431 is configured to control laser 432;

[0156] a laser 432 configured to generate laser light;

[0157] The laser projection assembly 43 is further configured to control the laser 432 to stop working through the mainboard 431 when a first control signal is received. In a specific implementation, the laser 432 is controlled to work through the mainboard 431 when a second control signal is received.

[0158] In a specific implementation, the mainboard 431 may include a driving circuit in a power supply of the laser projection device, and the driving circuit is used to drive the laser 432 to work or control the laser 432 to not work.

[0159] In some embodiments, the detection component 41 includes: multiple detection elements, the above-mentioned detection range includes multiple sub-areas corresponding to the multiple detection elements one by one, each detection element is used to obtain the infrared detection signal in the corresponding sub-area, that is, the multiple detection elements are respectively configured to obtain the pyroelectric infrared energy of different sub-areas of the laser projection area of ​​the laser projection component to obtain the infrared detection signal.

[0160] The laser projection component is specifically used to stop projecting display content to the sub-area corresponding to the target detection element when the infrared detection signal obtained by the target detection element among the multiple detection elements meets the above-mentioned start-up condition.

[0161] Taking the example of the signal parameters in the above-mentioned turn-on conditions including the energy change rate, the laser projection component 43 is specifically configured to stop projecting the display content to the sub-area corresponding to the target detection element when the change rate of the pyroelectric infrared energy acquired by the target detection element among the multiple detection elements is greater than or equal to the energy change rate threshold.

[0162] In the embodiment of the present application, the multiple sub-areas may partially or completely overlap. In some other embodiments, the multiple sub-areas may not overlap.

[0163] For example, as shown in Figure 19, in Figure 19, taking the detection component 41 including a first detection element 411 and a second detection element 412 (two detection elements) as an example, the first detection element 411 is configured to obtain the pyroelectric infrared energy of the first sub-area 101 of the laser projection area of ​​the laser projection component, and the second detection element 412 is configured to obtain the pyroelectric infrared energy of the first sub-area 102 of the laser projection area of ​​the laser projection component.

[0164] Based on the embodiment shown in Figure 19, referring to Figure 20, when the user stands in the first sub-area 101, the pyroelectric infrared energy of the first sub-area 101 detected by the first detection element 411 is relatively large, and the signal parameter of the infrared detection signal output by the first detection element 411 is not less than the parameter threshold. Then, in this case, the laser projection component 43 can stop projecting display content to the first sub-area 101 corresponding to the first detection element 41, and project display content to other sub-areas (i.e., the second sub-area 102) normally.

[0165] Based on the embodiment shown in Figure 19, referring to Figure 21, when the user stands in the second sub-area 102, the rate of change of the pyroelectric infrared energy of the second sub-area 102 detected by the second detection element 412 is large, and the signal parameter of the infrared detection signal output by the second detection element 412 is not less than the parameter threshold. Then, in this case, the laser projection component 43 can stop projecting display content to the second sub-area 102 corresponding to the second detection element 42, and normally project display content to other sub-areas (i.e., the first sub-area 101).

[0166] Based on the embodiment shown in Figure 19, referring to Figure 22, when the user stands in the overlapping area of ​​the first sub-area 101 and the second sub-area 102, the rate of change of the pyroelectric infrared energy of the first sub-area 101 detected by the first detection element 411 is large, and the rate of change of the pyroelectric infrared energy of the second sub-area 102 detected by the second detection element 412 is also large. The signal parameters of the infrared detection signals output by the first detection element 411 and the second detection element 412 are not less than the parameter threshold. In this case, the laser projection component 43 can stop projecting display content to the laser projection area (including the first sub-area 101 and the second sub-area 102).

[0167] In one specific implementation, taking the laser projection assembly 43 including a main board 431 and a laser 432 as an example, when the rate of change of the pyroelectric infrared energy obtained by the above-mentioned multiple detection elements is greater than or equal to the energy change rate threshold, the main board 431 controls the laser 432 to stop working.

[0168] That is, when the rate of change of the pyroelectric infrared energy obtained by the multiple detection elements is greater than or equal to the energy change rate threshold, the laser projection component 43 no longer projects the display content to the laser projection area. In the above embodiment, the mainboard 431 can be used to control the laser 432 to stop working, so as to quickly stop projecting the display content to the laser projection area.

[0169] As can be seen from the above embodiments, the laser projection device provided by the embodiments of the present application can immediately stop projecting the display content when the signal parameters of the infrared detection signal are large. In a specific implementation, since the rate of change of the pyroelectric infrared energy in the laser projection area will be less than the threshold rate of change when no human body enters the laser projection area, the detection component may not send an infrared detection signal such as a pulse to the control component. When the control component does not receive the infrared detection signal or the signal parameters of the received infrared detection signal are small, it will output a first level signal to the laser projection component. When the control component outputs the first level signal, the laser projection component will project the display content. Therefore, the embodiment of the present application can project the display content normally when there is no human body intruding into the laser projection area of ​​the laser projection component to ensure the normal display of the projection picture. In the event that a human body enters the laser projection area, the rate of change of the pyroelectric infrared energy in the laser projection area is usually relatively large. The detection component will send an infrared detection signal, such as a pulse, to the control component. After receiving the infrared detection signal, the control component will output a second level signal to the laser projection component. When the control component outputs the second level signal, the laser projection component will stop projecting the display content. Therefore, the embodiment of the present application can stop projecting the display content when a human body enters the laser projection area of ​​the laser projection component to protect the human eye. Compared to the related art that determines whether a human body has entered the laser projection area of ​​the laser projection device based on the number of pulses of the pulse signal within a preset time length, the embodiment of the present application can stop projecting the display content immediately after the human body enters the laser projection area of ​​the light projection device, without waiting for the preset time length. Therefore, the embodiment of the present application can reduce the startup delay of the human eye protection.

[0170] As can be seen from the above, the embodiments of the present application can also reduce misjudgment while minimizing damage to the human eye, which will be introduced below.

[0171] In one specific implementation, the infrared detection signal includes a plurality of consecutive reading cycles of infrared detection signals, and the activation condition of the eye protection function also includes the user being in proximity to the laser projection device during the plurality of reading cycles. That is, if the user is in proximity to the laser projection device and the signal parameter of the infrared detection signal is not less than the parameter threshold, projection of the display content is stopped. If the user is away from the laser projection device, typically with their back to the laser projection device's light outlet, projection of the display content continues without irradiating the user's eyes. In this way, false positives are reduced while minimizing damage to the user's eyes, thereby improving detection accuracy.

[0172] In one specific implementation, the control component 42 is also used to determine the user's status within the multiple reading cycles based on the infrared detection signals of the multiple reading cycles, where the status is far away from the laser projection device or close to the laser projection device, determine the signal parameters of the infrared detection signals of the multiple reading cycles, and determine whether the infrared detection signal meets the start-up conditions based on the user's status within the multiple reading cycles and the signal parameters of the infrared detection signals of the multiple reading cycles.

[0173] In one specific implementation, the control component 42 is specifically used to obtain the detection signals of the multiple reading cycles, which include a first flag bit and a second flag bit. The detection signal is obtained based on the infrared detection signal, and based on the first flag bit included in the detection signal of the multiple reading cycles, the user's status in the multiple reading cycles is determined, and based on the second flag bit included in the detection signal of the multiple reading cycles, the signal parameters of the infrared detection signal of the multiple reading cycles are determined.

[0174] That is, in one specific implementation, the detection signal can be represented in binary form, and the detection signal includes a first flag bit and a second flag bit, wherein the first flag bit is used to indicate the user's movement direction, that is, the user's state within multiple reading cycles, which state is far away from the laser projection device or close to the laser projection device, and the second flag bit can be used to represent the signal parameter of the detection signal, wherein the signal parameter can be used to characterize the distance between the user and the laser projection device. For example, the signal parameter includes signal strength. The greater the signal strength, the shorter the distance between the user and the laser projection device. Exemplarily, the waveform diagram of the detection signal can be shown in Figure 23.

[0175] In one specific implementation, the detection signal of a read cycle may include a first bit number, a second bit number, and a third bit number, the first bit number being the first n binary numbers of the detection signal, serving as a guide code, the third bit number being the last binary number of the detection signal, serving as an end code for the detection signal of a read cycle, the second bit number including a first flag bit and a second flag bit, the first flag bit being the first binary number in the second bit number, and the second flag bit being the binary number in the second bit number other than the first binary number.

[0176] Exemplarily, the detection signal obtained by the control component 42 within a reading cycle can be represented by a 19-bit binary number, as shown in Figure 24, where bits 18 and 17 in Figure 24 are the first bit number, bit 0 is the third bit number, and bits 1 to 16 are the second bit number. In the second bit number, for example, bit 16 can be the first flag bit, and bits 1 to 15 can be the second flag bit.

[0177] Taking the signal parameter as signal strength as an example, the detection signals of two consecutive reading cycles are: 0000000000000001110, 00000000000000000010, and the second bit number of the detection signal 0000000000000001110 is: 0000000000000111. The first flag bit is 0, which means that the user is away from the laser device. The second flag bit is 000000000000111, which means that the signal strength of the detection signal is 7. The second bit number of the detection signal 00000000000000000010 is 00000000000000001, and the first flag bit is 0, which means that the user is away from the laser device. The second flag bit is 000000000000001, indicating that the signal strength of the detection signal is 2. It should be understood that the numbers here are only used to intuitively indicate the size of the signal strength, for example, 7 is greater than 2.

[0178] If the signal parameters include a single parameter, the second flag bit indicates the magnitude of the parameter, which can be one of signal strength, strength change rate, signal energy, or energy change rate. If the signal parameters include multiple parameters, the second flag bit includes multiple binary segments, each corresponding to the multiple parameters, with each binary segment indicating the magnitude of the corresponding parameter. In one embodiment, the length of each binary segment can be fixed, and the lengths of different binary segments can be the same or different.

[0179] Taking the signal parameters including signal strength and energy change rate as an example, for example, the first binary segment represents the magnitude of the signal strength, and the second binary segment represents the magnitude of the energy change rate. The first binary segment and the second binary segment both include 15 bits.

[0180] In one specific implementation, referring to FIG25 , the laser projection device further includes a signal output component 44, which is configured to process the infrared detection signal to obtain a detection signal and output the detection signal to the control component 42. For example, the signal output component 44 is configured to send a detection signal of a plurality of consecutive read cycles to the control component 42, wherein the detection signal is obtained by processing the infrared detection signal by the signal output component 44.

[0181] FIG26 is a schematic diagram of the structure of another laser projection device provided in an embodiment of the present application. Referring to FIG26 , the laser projection device includes a detection component (not shown), a signal output component 201 , a control component 202 , a power supply 203 and a laser 204 .

[0182] In one embodiment, the power supply 203 and the laser 204 can be combined to form part or all of the laser projection assembly 43 in the above embodiment.

[0183] In one embodiment, the power supply 203 includes a driving circuit, which is used to drive the laser 204 to turn on, or control the laser 204 to turn off, or adjust the brightness of the laser light emitted by the laser 204. In one embodiment, the laser projection assembly can input a first control signal into the driving circuit, and the driving circuit controls the laser 204 to turn off under the action of the first control signal.

[0184] In a specific implementation, the power supply 203 is also used to supply power to the laser projection device, which will not be described in detail herein.

[0185] In a specific implementation, the control component 202 may include an MCU, that is, the control component 202 may determine whether to trigger the human eye protection function through the MCU.

[0186] In one specific implementation, the control component 202 is configured to determine the user's status in a plurality of reading cycles according to the first flag bit, and determine the signal parameters of the detection signal in the plurality of reading cycles according to the second flag bit.

[0187] In one specific implementation, if the state is close to the laser projection device, and there is a detection signal greater than or equal to the parameter threshold in the signal parameters of the detection signal of multiple reading cycles, it means that the user is too close to the laser projection device and it is easy to cause damage to the human eye. The human eye protection function can be triggered, and the human eye protection function is used to turn off the laser 204.

[0188] That is to say, as the user approaches the laser projection device, the distance between the user and the laser projection device decreases, and the signal parameters of the infrared detection signal received by the detection component will increase. After reaching the parameter threshold, the human eye protection function will be triggered to turn off the laser 240.

[0189] However, after the user approaches the laser projection device and causes the laser 240 to be turned off, when the user moves away from the laser projection device, the laser projection device can turn on the laser 240 and restore the display image.

[0190] In one specific implementation, a read cycle includes multiple clock cycles, and the control component 202 reads the detection signal according to the following timing sequence:

[0191] (1) After the laser projection device is turned on, the signal output component 201 starts to power on. When starting to work, the control component 202 pulls up the level of the connection line (also called Out line) between the control component 202 and the signal output component 201 and maintains it for at least two clock cycles.

[0192] (2) After the high level of the Out line is maintained for at least two clock cycles, the control component 202 pulls the level of the Out line down to a low level and maintains it for at least 200 ns (nanoseconds).

[0193] (3) After the low level of the Out line is maintained for 200ns, a rising edge is generated on the Out line and the high level is maintained for at least 200ns.

[0194] (4) Start reading data from the highest bit of the received detection signal, repeat steps (2) and (3), and read the data of the lowest bit of the detection signal in sequence.

[0195] (5) After the reading is completed, the control component 202 controls the Out line to be at a low level and maintains it for at least 64 clock cycles to complete the data update.

[0196] (6) Start a new reading cycle.

[0197] It should be noted that due to the user's movement inertia, in the process of the user approaching the laser projection device, the first flag bits in the detection signals of multiple reading cycles are generally consistent, or, in the detection signals of the multiple reading cycles, the first flag bits of most of the detection signals are consistent. Based on the first flag bits of the detection signals of the multiple reading cycles, the user's state in the multiple reading cycles can be determined. For example, if the first flag bits of at least a first number of reading cycles in the multiple reading cycles indicate that the user's state is close to the laser projection device, the control component 202 determines that the user's state is close to the laser projection device. If the first flag bits of less than the first number of reading cycles in the multiple reading cycles indicate that the user's state is close to the laser projection device, the control component 202 determines that the user's state is far away from the laser projection device.

[0198] The first number may be an integer not less than a first ratio of the total number of cycles of the plurality of read cycles. The first ratio may be 2 / 3, 4 / 5, or other values. Taking the total number of cycles as 80 as an example, assuming the first ratio is 4 / 5, the first number may be 64, 70, or any other integer not less than 64.

[0199] In the above embodiment, the laser projection device includes a signal output component 201 and a control component 202. The signal output component 201 is used to process the infrared detection signal detected within the detection range of the environment in which the laser projection device is located to obtain a detection signal. The signal output component 201 is used to send a detection signal of multiple consecutive reading cycles to the control component 202. The detection signal includes a first flag bit and a second flag bit. The control component 202 is used to determine the user's status during the multiple reading cycles based on the first flag bit, and to determine the signal parameters based on the second flag bit. If the status is close to the laser projection device, and the signal parameters of the detection signals of the multiple reading cycles are not less than the parameter threshold, the human eye protection function is triggered to shut down the laser, thereby stopping the projection of the display content. By outputting a continuous detection signal, the embodiment of the present application allows the control component 202 to judge the user's status and signal parameters to determine whether to trigger the human eye protection function, thereby improving the accuracy of the judgment, reducing the possibility of frequent triggering of the human eye protection function causing the screen to turn off, and improving the user's viewing experience.

[0200] Next, the structure of the detection component in the embodiment of the present application is exemplarily introduced.

[0201] In one specific implementation, as shown in Figures 13-18 and 27, the detection component 41 includes at least one binary sensitive element, which is located on a side close to the light outlet of the laser. For example, in Figures 13-18 and 27, only one binary sensitive element is shown, and in the example of Figure 7, there are two binary sensitive elements.

[0202] The binary structure of the binary sensitive element is shown in Figure 28. Each binary sensitive element includes a first sensitive element and a second sensitive element.

[0203] In a specific implementation, the signal output component 201 is used to determine a first movement direction of a user between a first sensitive element and a second sensitive element in each reading cycle, and determine a first flag bit based on the first movement direction.

[0204] In one specific implementation, in order to determine the user's movement direction, the first sensitive element and the second sensitive element can be placed side by side at different heights on one side close to the light outlet of the laser. In the plane where the first sensitive element, the second sensitive element and the light outlet of the laser are located, the height of the first sensitive element is different from the height of the second sensitive element. For example, the height of the first sensitive element is greater than the height of the second sensitive element.

[0205] Based on this, the signal output component 201 is specifically used to: if the first movement direction indicates that the user is making a transverse movement from the first sensitive element to the direction of the second sensitive element, then determine that the first flag position indicates that the user is approaching the laser projection device; if the first movement direction indicates that the user is making a transverse movement from the second sensitive element to the direction of the first sensitive element, then determine that the first flag position indicates that the user is away from the laser projection device.

[0206] For example, as shown in FIG29 , FIG29 is a schematic diagram of the first sensitive element and the second sensitive element on one side of the light outlet of the laser projection device. This schematic diagram may be a top view of the laser projection device. If the first motion direction is the direction in which the user moves transversely from the first sensitive element to the second sensitive element, indicating that the user is away from the laser projection device, the signal output component 201 may determine that the first flag is 0. If the first motion direction is the direction in which the user moves transversely from the second sensitive element to the first sensitive element, indicating that the user is approaching the laser projection device, the signal output component 201 may determine that the first flag is 1.

[0207] It is understood that the first flag bit described above is merely an example. Alternatively, when the user is far away from the laser projection device, the first flag bit may be determined to be 1, and when the user is close to the laser projection device, the first flag bit may be determined to be 0. The first flag bit and the second flag bit may have different values, and this is not limited in this embodiment of the present application.

[0208] Next, another laser projection device provided in an embodiment of the present application is described in conjunction with FIG30 .

[0209] Figure 30 is a structural schematic diagram of another laser projection device provided in an embodiment of the present application. Referring to Figure 30, the laser projection device includes a detection component 2012, a signal output component 201 and a control component 202.

[0210] In a specific implementation, the signal output component 201 may include an analog-to-digital converter (ADC) 2011 , and the signal output component 201 is connected to the control component 202 via the ADC 2011 .

[0211] In one specific implementation, the signal output component 201 further includes at least one of a filter 2013 (eg, a bandpass filter), an amplifier 2014 , an oscillator 2015 , and a voltage stabilization circuit 2016 as shown in FIG. 30 .

[0212] Taking the signal output component 201 including a filter 2013 (for example, a bandpass filter), an amplifier 2014, an oscillator 2015, and a voltage stabilizing circuit 2016 as an example, the detection component 2012 is connected to the filter 2013, the filter 2013 is connected to the amplifier 2014, the amplifier 2014 is connected to the ADC 2011, and the ADC 2011 is respectively connected to the control component 202, the oscillator 2015 and the voltage stabilizing circuit 2016.

[0213] Similar to the embodiments of Figures 14 to 18 above, filter 2013 (e.g., a bandpass filter), amplifier 2014, oscillator 2015, and voltage stabilizing circuit 2016 are all optional. The present embodiment does not limit the connection order or relationship of these components. Figure 30 is merely used to exemplify the laser projection device provided by the present embodiment. The following description will use the example of signal output component 201 including filter 2013 (e.g., a bandpass filter), amplifier 2014, oscillator 2015, and voltage stabilizing circuit 2016.

[0214] In one implementation, the amplifier 2014 may be a triode or other types of amplifiers.

[0215] The detection component 2012 is used to detect the infrared detection signal and send the infrared detection signal to the filter 2013.

[0216] The filter 2013 is used to filter the infrared detection signal to obtain a first signal.

[0217] The amplifier 2014 is configured to amplify the first signal to obtain a second signal.

[0218] ADC2011 is specifically configured to process the second signal to obtain detection signals of multiple reading cycles, and send the detection signals of the multiple reading cycles to the control component 202.

[0219] The control component 202 is specifically used to determine whether to trigger the human eye protection function based on the detection signals of the multiple reading cycles to stop projecting the display content or continue projecting the display content. The specific description can refer to the above embodiment and will not be repeated here.

[0220] It can be understood that the detection signal obtained after processing by ADC2011 can be a digital signal, so that the subsequent control component 202 can directly determine whether to trigger the human eye protection function based on the digital signal.

[0221] In one specific implementation, the signal output component 201 directly sends an infrared detection signal to the control component 202. The control component 202 may include at least one device or circuit such as a filter, an amplifier, an oscillator, a voltage regulator circuit, and an ADC. The control component 202 may process the infrared detection signal through the at least one device or circuit to obtain a detection signal.

[0222] In a specific implementation, when the detection device 2012 includes at least one binary sensitive element, the at least one binary sensitive element may be connected to the filter 2013 .

[0223] Taking the detection device 2012 including the first sensitive element and the second sensitive element as shown in Figure 29 as an example, the first sensitive element and the second sensitive element are connected to the filter 2013 respectively.

[0224] ADC2011 is specifically used to: determine the first movement direction of the user between the first sensitive element and the second sensitive element based on the second signal, determine the first flag bit based on the first movement direction, and for any reading cycle, determine the second flag bit in the detection signal of the reading cycle based on the second signal of the reading cycle.

[0225] Exemplarily, ADC2011 may sample the second signal in a reading cycle, and determine the second flag bit of the detection signal of the reading cycle according to the second signal.

[0226] In this embodiment, the laser projection device includes a detection component 2012, a signal output component 201, and a control component 202. The detection component 2012 is configured to detect infrared detection signals and transmit them to the signal output component 201. The signal output component 201 processes the infrared detection signals to generate detection signals corresponding to multiple read cycles, and transmits these detection signals to the control component 202. The control component 202 is specifically configured to determine whether to trigger the eye protection function based on the detection signals corresponding to the multiple read cycles.

[0227] In one specific implementation, the signal output component 201 includes a filter 2013, an amplifier 2014, an oscillator 2015, an ADC 2011, and a voltage regulator circuit 2016. The detection component 2012 is configured to detect an infrared detection signal and send the infrared detection signal to the filter 2013. The filter 2013 is configured to filter the infrared detection signal to obtain a first signal. The amplifier 2014 is configured to amplify the first signal to obtain a second signal. The ADC 2011 is configured to process the second signal to obtain detection signals for multiple read cycles and send the detection signals for multiple read cycles to the control component 202.

[0228] Among them, when determining whether to trigger the human eye protection function, the control component 202 can combine the actual scenario, such as considering the user's movement speed. When the user moves faster, the intensity change rate and / or energy change rate of the infrared detection signal is large. If the control component 202 does not trigger the human eye protection function in time at this time, the user's eyes are easily exposed to laser light.

[0229] Based on this, in some embodiments, the control component 202 may consider the user's movement speed when determining whether to trigger the human eye protection function.

[0230] In one embodiment, the control component 202 is specifically configured to: determine a change rate of a signal parameter of the infrared detection signal during a plurality of reading cycles, and if the change rate is not less than a speed threshold, reduce the parameter threshold in the activation condition.

[0231] In one specific implementation, the control component 202 is specifically configured to reduce the parameter threshold according to a first ratio or a first step length. If the parameter threshold includes thresholds for multiple parameters, the control component 202 is specifically configured to reduce the thresholds for some or all of the multiple parameters. The first ratio or the first step length can be a preset value.

[0232] In one specific implementation, the control component 202 is specifically configured to: obtain a first parameter threshold after reducing the parameter threshold, and determine whether the infrared detection signal meets the above-mentioned start-up condition based on the first intensity threshold.

[0233] In one specific implementation, the control component 202 is specifically used to: if the user's status is close to the laser projection device, continue to determine whether there is a detection signal that is not less than the first parameter threshold in the signal parameters of the detection signals of the multiple reading cycles; when there is a detection signal that is not less than the first parameter threshold in the signal parameters of the detection signals of the multiple reading cycles, determine that the infrared detection signal meets the above-mentioned start-up condition; when there is no detection signal that is not less than the first parameter threshold in the signal parameters of the detection signals of the multiple reading cycles, determine that the infrared detection signal does not meet the above-mentioned start-up condition.

[0234] Taking the signal parameters including signal strength as an example, the control component 202 is specifically used to determine the changing speed of the signal strength based on the signal strength of the infrared detection signal of multiple reading cycles. If the changing speed is greater than or equal to the speed threshold, it means that the user is moving faster, and the intensity threshold can be reduced to obtain the first intensity threshold. If the state is close to the laser device, it can be determined whether there is an infrared detection signal with a signal strength greater than or equal to the first intensity threshold in the infrared detection signals of the multiple reading cycles.

[0235] For example, for the changes in signal strength values ​​corresponding to multiple read cycles, reference can be made to Figure 31. The horizontal axis in Figure 31 represents the signal strength, and the vertical axis is the time axis. The curve in Figure 31 is determined by the signal strength of multiple read cycles. The signal strength of each read cycle can be determined based on the detection signal of the read cycle. Specifically, the signal strength of the read cycle can be determined based on the second flag bit in the detection signal.

[0236] As shown in FIG31 , a larger slope in the curve indicates a faster change in signal strength, which in turn indicates a faster user movement. This means the human eye will enter the range of the light outlet more quickly. By reducing the intensity threshold, the eye protection function can be triggered in advance to shut down laser 204, thereby protecting the eye from laser irradiation.

[0237] In one specific implementation, the control component 202 is further configured to: after triggering the human eye protection function, if it is detected that the user is away from the laser projection device, increase the parameter threshold so that the human eye protection function is not easily triggered.

[0238] In one specific implementation, the control component 202 can determine whether the infrared detection signal meets the activation condition based on the increased parameter threshold, and then control the laser 240 to turn on to resume the display image, or control the laser 204 to turn off to stop projecting the display content. In particular, since it is detected that the user is away from the laser projection device, the control component 202 can, while increasing the parameter threshold, also determine that the current infrared detection signal does not meet the activation condition, and thus output a second control signal to control the laser 204 to turn on, thereby resuming projection.

[0239] As can be seen from the foregoing, in this embodiment, when control component 202 receives a detection signal from a subsequent read cycle, it determines based on the detection signal that the user is away from the laser device, increases the parameter threshold, and based on the increased parameter threshold and the current user status, determines that the current infrared detection signal does not meet the activation condition, thereby controlling laser 240 to activate and restore the display. If the user approaches the laser projection device again, the signal parameter is unlikely to reach the increased parameter threshold, allowing for a more stable display and ensuring a good viewing experience.

[0240] Furthermore, the circumstances of different users can be considered. Adults, for example, have a more mature sense of self-protection and place greater emphasis on the viewing experience when using laser projection equipment. Therefore, in adult mode, the parameter threshold can be set higher to reduce detection sensitivity and the possibility of false triggering of the eye protection function. Children, on the other hand, have a relatively weaker sense of self-protection, so stronger protective measures are needed. The parameter threshold can be set lower than that of adults to increase detection sensitivity and achieve safety protection for children.

[0241] For example, Figure 32 shows a child and an adult within the detection range of the detection component. As can be seen from Figure 32, children are closer to the detection component than adults within the detection range, meaning they are closer to the laser projection device. Consequently, parameters such as the signal intensity of the infrared detection signal generated by children are higher. For example, the signal intensity for adults and children can be seen in the waveforms shown in Figure 33.

[0242] In any of the above embodiments, the control component may store parameter thresholds corresponding to different user modes, and the control component may determine the user mode based on the signal parameters of the infrared detection signal, and the user mode may be adult mode or child mode; and determine the parameter threshold based on the user mode.

[0243] In one specific implementation, the control component is specifically configured to determine the user mode according to a signal parameter of a target read cycle, where the target read cycle is at least one read cycle among the plurality of read cycles.

[0244] Exemplarily, the target read cycle may be the last m read cycles of the plurality of read cycles, where m is an integer greater than or equal to 1. The control component may determine the user mode based on the signal parameters of these m read cycles. For example, if the signal parameters of these m read cycles are all greater than or equal to the parameter threshold for mode selection, the user mode may be determined to be child mode. If any signal parameter of these m read cycles is less than the parameter threshold, the user mode may be determined to be adult mode.

[0245] In another example, when any one of the signal parameters of the m reading cycles is greater than or equal to the parameter threshold, it can be determined that the user mode is child mode; if the signal parameters of the m reading cycles are all less than the parameter threshold, it can be determined that the user mode is adult mode.

[0246] It can be understood that in the above two examples, the target read cycle is only an example, and the target read cycle can also be the multiple read cycles, or any other m read cycles in the multiple read cycles, and the embodiments of the present application do not limit this. Moreover, the determination methods in the above two examples are only two possible implementation methods, and other methods can also be used. For example, if the signal parameters of these m read cycles are all greater than or equal to the parameter threshold, the user mode is determined to be child mode. If the signal parameters of these m read cycles are all less than the parameter threshold, the user mode can be determined to be adult mode. The embodiments of the present application do not limit this.

[0247] In a specific implementation, when the signal parameters include multiple parameters, the control component is specifically configured to determine the user mode according to a target parameter of the infrared detection signal. The target parameter is at least one parameter in the signal parameters.

[0248] Taking signal strength as the target parameter, the control component is specifically configured to determine the user mode based on the target parameter of the target read cycle. For example, if the signal strengths of the m read cycles are all greater than or equal to the strength threshold for mode selection, the user mode can be determined to be child mode. If any of the signal strengths of the m read cycles is less than the strength threshold, the user mode can be determined to be adult mode.

[0249] In an embodiment of the present application, the parameter threshold in the adult mode is greater than the parameter threshold in the child mode.

[0250] In one specific implementation, the control component is specifically used to: if the user mode is adult mode, determine the parameter threshold as the second parameter threshold; if the user mode is child mode, determine the parameter threshold as the third parameter threshold, wherein the second parameter threshold is greater than the third parameter threshold.

[0251] In this embodiment, the control component can control the detection sensitivity according to different user modes to improve the accuracy of determining whether the human eye protection function is triggered. In adult mode, the parameter threshold can be set higher to reduce the detection sensitivity, reduce the possibility of false triggering of the human eye protection function, and improve the viewing experience. In child mode, the parameter threshold can be set lower to increase the detection sensitivity and achieve safety protection for children.

[0252] In one specific implementation, the laser projection component in any of the above embodiments is specifically used to: if the user mode is child mode, stop projecting the display content when receiving a first control signal; if the user mode is adult mode, stop projecting the display content after a first delay time when receiving the first control signal.

[0253] The first duration may be a first preset duration, such as 3s, 5s, or other time values.

[0254] In one specific implementation, in any of the above embodiments, the laser projection component is further configured to: upon receiving the first control signal output by the control component, output a reminder message (also referred to as a prompt message). The reminder message is configured to indicate that a user is within the laser projection area of ​​the laser projection device, that is, to remind the user to stay away from the laser projection device.

[0255] As can be seen from the above, the embodiments of the present application can also solve the problem of uneven product appearance caused by the use of arc-shaped Fresnel lenses in related technologies. This will be described in detail below.

[0256] In an embodiment of the present application, the laser projection device may include a converging lens, a sensor, and a processor with a planar structure, so that the appearance of the laser projection device is relatively flat through the converging lens with a planar structure.

[0257] The converging lens is used to converge the user's infrared light onto the sensor. In a specific implementation, the converging lens with a planar structure can be a Fresnel lens.

[0258] The sensor is configured to receive infrared light focused by the planar converging lens, generate an infrared detection signal, generate a processed infrared detection signal, or generate a level signal based on the infrared detection signal, and transmit the generated signal to the processor. In some embodiments, the signal output by the sensor may also be referred to as a control signal. The following description uses the sensor output signal as an example of a control signal.

[0259] The processor is configured to control the laser assembly to not emit the laser beam according to the control signal. In a specific implementation, the processor may include part or all of the control assembly in the above embodiment.

[0260] Exemplarily, when the laser emitted by the laser projection assembly is projected onto the projection screen through the lens, the user can watch the video or image on the projection screen. During the process of playing the video or image on the projection screen, when the user enters the detection range of the converging lens of the planar structure, the infrared light emitted by the user's body can be converged onto the sensor through the converging lens of the planar structure, for example, onto the receiving surface of the sensor. The sensor can receive the converged infrared energy, generate a control signal, and transmit the generated control signal to the processor. The processor can control the laser projection assembly not to emit the laser beam according to the control signal, so that the lens no longer emits the projection beam, thereby protecting the user's eyes from being damaged by the laser.

[0261] For example, the control signal generated by the sensor can be a level signal that varies in high and low levels. For example, when a heat source moves, the infrared light emitted alternately passes through different areas of the lens. Due to the different refractive indices of different areas on the lens, the infrared light received by the sensor alternates, and the sensor can output a level signal that varies in high and low levels.

[0262] It should be noted that the sensor may also include an amplifier circuit that can amplify the signal output by the sensor, for example, the level signal generated by the sensor. The amplifier circuit can reduce the situation where the processor cannot receive the signal due to transmission loss caused by a small signal transmitted to the processor.

[0263] In one specific implementation, when the processor controls the laser projection assembly to not emit a laser beam according to a control signal, the processor can determine an eye protection mode (also referred to as a user mode) according to the control signal. When the eye protection mode is the first mode, the laser projection assembly is controlled to be turned off; when the eye protection mode is the second mode, the laser projection assembly is controlled to be turned off after a first delay.

[0264] The first duration may be 2 minutes or 5 minutes, which is not limited in this embodiment of the present application.

[0265] The eye protection mode may be pre-set by the user or may be the default mode of the device, and this is not limited in the embodiments of the present application. The first mode may be a mode in which the laser projection component needs to be turned off as soon as possible, for example, the first mode may be a children's mode. The first mode may be a mode in which the laser projection component does not need to be turned off as soon as possible, for example, the second mode may be a standard mode or an adult mode. In this way, depending on the eye protection mode, the laser projection component is turned off at different times.

[0266] In a specific implementation, when the human eye protection mode is the second mode, a prompt message is output, and the prompt message is used to prompt the user to stay away from the laser projection device.

[0267] The prompt information can be played as a voice, for example, playing the voice of "Please stay away from the laser projection equipment", or it can be displayed as text or symbols on the projection medium. The embodiment of the present application does not specifically limit the form and content of the prompt information.

[0268] Furthermore, after the first period of time, the processor can detect whether it can still receive the control signal sent by the sensor. If the processor receives the control signal for controlling the laser projection component to shut down, it controls the laser projection component to shut down; if the processor does not receive the control signal for controlling the laser projection component to shut down, it does not control the laser component to shut down.

[0269] After the first time period, if the processor receives a control signal for controlling the laser projection component to be turned off, it indicates that the user is still within the detection range (also known as the human eye protection range), and the laser projection component can be turned off. If the processor does not receive a control signal for controlling the laser projection component to be turned off, it indicates that the user has already moved away from the laser projection device as prompted by the prompt information, that is, has left the human eye protection range, and there is no need to turn off the laser projection component. In this way, when the user enters the human eye protection range, the user is first prompted to move away. If the user does not move away after a certain period of time and then turns off the laser projection component, the number of times the laser projection component is turned off can be reduced, that is, frequent shut-downs of the laser projection component can be avoided.

[0270] Next, the converging lens with a planar structure in the embodiment of the present application is introduced.

[0271] For example, the installation method of a planar structure converging lens on a laser projection device can be seen in FIG34 , which is a structural schematic diagram of a planar structure converging lens on a laser projection device provided in an embodiment of the present application.

[0272] As shown in FIG34 , the plane where the converging lens of the planar structure is located is perpendicular to the plane where the lens is located, and the surface of the converging lens of the planar structure is flush with the housing of the laser projection device.

[0273] It should be noted that FIG34 is only used as an example to illustrate a planar converging lens (such as a planar Fresnel lens) located on the left side of the lens, and FIG34 does not constitute any limitation.

[0274] In an embodiment of the present application, the surface of the converging lens with a planar structure may be recessed, flush, or protruding from the outer shell. FIG34 in the embodiment of the present application only uses the example that the surface of the converging lens with a planar structure is flush with the outer shell of the laser projection device, and FIG34 does not constitute any limitation.

[0275] It is understandable that when the surface of the planar converging lens is flush with the housing of the laser projection device, the flush approach can better receive signals compared to the concave and convex approaches.

[0276] In the embodiment of the present application, the converging lens with a planar structure may be a planar Fresnel lens, and of course may also be a converging lens of other forms, which is not limited in the embodiment of the present application.

[0277] Taking a planar Fresnel lens as an example, combined with the above embodiments, it can be seen that due to the conical detection range of the Fresnel lens and the fact that the energy received by the sensor affects the detection distance and angle, the detection distance directly in front of the Fresnel lens (i.e., the side of the Fresnel lens closest to the user) is greater than the detection distance on either side of the Fresnel lens. In related art, to increase the detection distance on either side of the Fresnel lens, the gain of the sensor's amplifier circuit can be increased to improve the sensor's sensitivity.

[0278] However, increasing the gain of the sensor's amplifier circuit increases the detection distance on both sides of the Fresnel lens, but also increases the distance in front of the Fresnel lens. This may result in the Fresnel lens still being able to detect a human body when the human body is at a safe distance in front of the laser projection device, resulting in lower detection accuracy.

[0279] To address this issue, in an embodiment of the present application, the Fresnel pattern in the planar Fresnel lens is incomplete. The detection range of the planar Fresnel lens in the target direction is shorter than that of a planar Fresnel lens with complete Fresnel patterns. The target direction is the direction in which the planar Fresnel is away from the projection screen. In other words, the detection range of the planar Fresnel lens in a first plane is shorter than that of a planar Fresnel lens with complete Fresnel patterns. The first plane is perpendicular to the projection medium and the supporting surface of the laser projection device.

[0280] For example, some Fresnel patterns in front of the planar Fresnel lens, that is, at the end close to the user, can be removed to shorten the detection distance in front of the planar Fresnel lens, that is, reduce the detection range of the planar Fresnel lens on the first plane.

[0281] In this way, by removing part of the Fresnel patterns directly in front of the planar Fresnel lens, the gain of the amplifier circuit can be increased, and the detection distance on both sides of the planar Fresnel lens can be increased without increasing the detection distance directly in front of the planar Fresnel lens. This reduces the possibility of users at a safe distance being mistakenly detected as entering an unsafe distance, causing the laser projection component to malfunction, reduces false detections, and improves user experience.

[0282] Exemplarily, a portion of the planar Fresnel lens away from the projection screen has no Fresnel lines. In one embodiment, the ratio of the Fresnel lines on the planar Fresnel lens to the complete Fresnel lines is within a ratio range.

[0283] It can be understood that the end of the planar Fresnel lens away from the projection screen is the end of the planar Fresnel lens close to the user directly in front of the laser projection device.

[0284] In a specific implementation, the area without Fresnel lines can be a preset area, and the above ratio range can be a preset range. The preset area and the preset range can be set according to actual conditions, and the embodiment of the present application does not limit this.

[0285] For example, the Fresnel pattern at the front of the flat lens can be removed by 1 / 4 to 1 / 3, reducing the energy intensity transmitted to the sensor from the front, thereby avoiding false triggering in the front detection range and improving the user experience. In other words, the ratio range is 1 / 4 to 1 / 3.

[0286] In one specific implementation, in the embodiment of the present application, there may be multiple converging lenses, each of which may be mounted on either side of the lens, and the distance between the converging lenses and the lens is less than or equal to a first distance. The first distance may be a preset distance, which may be determined based on the size and structure of the laser projection device, and the embodiment of the present application does not limit the specific value of the first distance.

[0287] In a specific implementation, the number of converging lenses can be 2 or 4, which is not limited in the embodiment of the present application.

[0288] For example, when the number of converging lenses is even, the same number of converging lenses can be evenly installed on the left and right sides of the lens. When the number of converging lenses is odd, the same number of converging lenses can be evenly installed on the left and right sides of the lens first, and then the remaining lens can be installed on the left or right side of the lens. In other words, the multiple converging projections are distributed as evenly as possible on both sides of the lens. Of course, the multiple converging lenses can also be unevenly distributed. For example, for example, 2 converging lenses are distributed on one side of the lens and 4 converging lenses are distributed on the other side.

[0289] In combination with the above embodiments, taking the converging lens as a Fresnel lens as an example, a planar Fresnel lens including incomplete Fresnel patterns can be shown in Figure 35, which is a schematic diagram of a Fresnel lens including incomplete planar Fresnel patterns provided in an embodiment of the present application.

[0290] As shown in FIG35 , a plurality of planar Fresnel lenses may be installed on the laser projection device, and the Fresnel pattern at the end close to the user directly in front of the laser projection device is incomplete.

[0291] In a specific implementation, the above-mentioned multiple converging lenses can be spaced a certain distance apart from the lens on both sides of the lens, as shown in Figure 36, which is a schematic diagram of the positional relationship between a lens and a converging lens provided in an embodiment of the present application.

[0292] Of course, the multiple converging lenses can also be placed close to the lens on both sides of the lens and merged into one with the lens, as shown in Figure 37, which is a schematic diagram of the positional relationship between another lens and the converging lens provided in an embodiment of the present application.

[0293] In the related art, in order to solve the problem of a larger detection distance directly in front of the Fresnel lens due to increasing the gain of the amplification circuit, the sensor is installed at an angle to reduce the sensor's ability to detect the user directly in front of the Fresnel lens, that is, to reduce the detection distance directly in front of the Fresnel lens. However, the method of installing the sensor at an angle is not effective, and installing the sensor at an angle will waste space inside the laser projection device.

[0294] In the embodiment of the present application, the plane on which the sensor is located can be parallel to the plane on which the planar converging lens is located. Since the planar converging lens is not installed at an angle, the sensor does not need to be installed at an angle. In this way, by using a planar converging lens, the sensor can be installed parallel to the laser projection device, saving space occupied by the sensor inside the laser projection device.

[0295] In combination with the above embodiments, taking the planar converging lens as a Fresnel lens as an example, the detection range of the laser projection device provided in the embodiment of the present application when performing human body detection can be shown in Figures 38 and 39. Figure 38 is a schematic diagram of the detection range in a side view provided in the embodiment of the present application. Figure 39 is a schematic diagram of the detection range in a front view provided in the embodiment of the present application.

[0296] In FIG38 , the right boundary of the detection range in the side view is further to the left than the right boundary of the detection range of the arc-shaped Fresnel lens in the related art, thereby minimizing false detection of the user directly in front of the laser projection device.

[0297] FIG40 is a schematic diagram of the structure of another laser projection device provided in an embodiment of the present application. Referring to FIG40 , the laser projection device includes: a laser projection component 11, a detection component 12, and a control component 13. In one embodiment, the device also includes at least one of a controller 14, a tuner / demodulator, a communicator, an external device interface, an audio output interface, a memory, a power supply, and a user interface.

[0298] The laser projection component 11 is used to project the projection content onto the projection medium based on the laser. The detection component 12 is used to obtain the infrared detection signal and send the infrared detection signal to the control component 13. The control component 13 is used to send a first control signal to the laser projection component 12 when the infrared detection signal meets the activation condition of the human eye protection function. The activation condition includes that the signal parameter of the infrared detection signal is not less than the parameter threshold, wherein the signal parameter includes at least one of signal intensity, intensity change rate, signal energy, and energy change rate. The laser projection component 11 is used to stop projecting the display content when receiving the first control signal.

[0299] In a specific implementation, the laser projection component 11 is the laser projection component in any of the above embodiments, the detection component 12 is the detection component in any of the above embodiments, and the control component 13 is the control component in any of the above embodiments.

[0300] Taking the laser projection assembly 11, detection assembly 12, and control assembly 13 as examples of the corresponding components in the embodiment shown in FIG. 13 , in one specific implementation, the detection assembly 12 is configured to detect the pyroelectric infrared energy in the laser projection area of ​​the laser projection assembly to obtain an infrared detection signal, which is then transmitted to the first control assembly 421. The first control assembly 421 is configured to determine, based on the received infrared detection signal, whether the rate of change of the pyroelectric infrared energy in the laser projection area is greater than or equal to an energy change rate threshold. If the rate of change of the pyroelectric infrared energy in the laser projection area is greater than or equal to the energy change rate threshold, the control assembly 421 transmits a pulse signal to the second control assembly 422. If the second control assembly 422 does not receive the pulse signal, the control assembly 422 outputs a first level signal to the laser projection assembly 11. Upon receiving the pulse signal, the control assembly 422 outputs a second level signal of a first duration to the laser projection assembly 11. The laser projection assembly 11 is configured to project display content into the laser projection area via laser light when the control assembly 13 outputs the first level signal, and to cease projecting display content into at least one subarea within the laser projection area (e.g., the subarea corresponding to the target detection element) when the control assembly 13 outputs the second level signal.

[0301] Referring to Figure 41, in some embodiments, the laser projection assembly 11 includes: a laser 111, an illumination optical path 112, an imaging device 113, and a projection device 114. The laser 111 can be a semiconductor laser, a diode laser, or other types of laser. The laser light generated by the laser 111 can be an infrared laser, a visible light laser, an ultraviolet laser, or other types of laser, and is used to provide a light source for the illumination optical path. The illumination optical path 112 includes: a phosphor wheel, a color filter wheel, a beam combiner, a shaping device, a light homogenizer, etc., which are used to filter, combine, shape, and homogenize the laser light emitted by the laser 11 and / or the light generated by the phosphor wheel, so that the laser light emitted by the laser 111 and / or the light generated by the phosphor wheel meet the conditions for incident light valves. The imaging device 113 includes: a projection chip, a light valve, an optical modulator, and other devices, and is used to implement spatial light modulation using projection display technology, converting electrical signals (image / video signals) into optical signals. The projection device 114 (ie, the lens) includes a plurality of optical lenses. After receiving the light modulated by the imaging device 113, the light is processed by refraction, reflection, etc. of the plurality of optical lenses and projected onto a projection medium to form display content.

[0302] In some embodiments, the controller 14 includes at least one of a central processing unit (CPU), a video processor, an audio processor, a graphics processing unit (GPU), a random access memory (RAM), a read-only memory (ROM), first to nth interfaces for input / output, a communication bus, an MCU, a television system on chip (TV SOC), and an application-specific integrated circuit (ASIC). The controller 14 controls the operation of the laser projection device and responds to user operations by executing various software control programs stored in the memory. The controller 14 can be used to control the overall operation of the projection device.

[0303] In some embodiments, some (or all) components or circuits in the controller 14 may also be integrated into the control component 13, or may also be integrated into other components, which is not limited in the embodiments of the present application.

[0304] In some embodiments, the tuner-demodulator receives broadcast television signals via wired or wireless reception, and demodulates audio and video signals, such as Electronic Program Guide (EPG) data signals, from multiple wireless or wired broadcast television signals.

[0305] In some embodiments, the communicator is a component used to communicate with an external device or server using various communication protocols. For example, the communicator may include at least one of a wireless fidelity (WIFI) module, a Bluetooth module, a wired Ethernet module, or other network communication protocol chip or a near-field communication protocol chip, as well as an infrared receiver. The laser projection device can establish transmission and reception of control signals and data signals with an external control device or server via the communicator.

[0306] In one embodiment, the external device interface may include, but is not limited to, any one or more of the following: a High Definition Multimedia Interface (HDMI), an analog or digital high-definition component input interface (component), a composite video broadcast signal (CVBS), a Universal Serial Bus (USB), and an RGB color mode port. It may also be a composite input / output interface formed by multiple of the above interfaces.

[0307] In a specific implementation, the audio output interface is an interface for outputting audio information. The audio output interface may include but is not limited to the following: a microphone interface, an earphone interface, etc.

[0308] In one embodiment, the control component 13 controls the operation of the laser projection device and responds to user operations through various software control programs stored in the memory. The control component 13 controls the overall operation of the laser projection device.

[0309] Next, the control method of the laser projection device provided in the embodiment of the present application is introduced.

[0310] FIG42 is a flow chart of a control method for a laser projection device provided in an embodiment of the present application. In one specific implementation, the method is applied to the laser projection device in any of the above embodiments. The method includes the following steps S4201 and S4202.

[0311] S4201: Acquire an infrared detection signal within a detection range, where the detection range includes a laser projection area.

[0312] In an embodiment of the present application, the laser projection device includes a detection component, which acquires an infrared detection signal within a detection range.

[0313] For specific implementation methods, please refer to the relevant introduction in the above device embodiment, which will not be described in detail here.

[0314] S4202: When the infrared detection signal meets the activation condition of the human eye protection function, stop projecting the display content. The activation condition includes that the signal parameter of the infrared detection signal is not less than the parameter threshold, and the signal parameter includes at least one of signal intensity, intensity change rate, signal energy, and energy change rate.

[0315] In an embodiment of the present application, the laser projection device further includes a control component and a laser projection component. When the infrared detection signal satisfies the activation conditions of the eye protection function, the control component transmits a first control signal to the laser projection component. Upon receiving the first control signal, the laser projection device stops projecting the displayed content. For specific implementation methods, please refer to the relevant description in the device embodiment above.

[0316] In one specific implementation, the control component includes a first control component and a second control component, and the first control signal is a second level signal. When the infrared detection signal meets the activation condition for the eye protection function, the projected display content is stopped. This includes: when the infrared detection signal meets the activation condition, the first control component sends a pulse signal to the second control component; and when the second control component receives the pulse signal from the first control component, the second control component sends a second level signal to the laser projection component. Upon receiving the second level signal, the laser projection device stops projecting the display content. For specific implementation methods, please refer to the relevant description in the device embodiment above.

[0317] The method further includes: when the second control component does not receive the pulse signal sent by the first control component, sending a first level signal to the laser projection component; when the laser projection component receives the first level signal, projecting the display content. For specific implementation methods, please refer to the relevant description of the device embodiment above.

[0318] In combination with some laser projection devices provided in the above embodiments, a control method for another laser projection device provided in an embodiment of the present application is introduced with reference to Figure 43.

[0319] FIG43 is a flowchart of another method for controlling a laser projection device provided in an embodiment of the present application. Referring to FIG43 , the method for controlling the laser projection device includes the following steps S151 to S154 .

[0320] S151: The detection component acquires the pyroelectric infrared energy of the laser projection area of ​​the laser projection component in real time and sends an infrared detection signal to the control component. If the rate of change of the pyroelectric infrared energy in the laser projection area is large, a pulsed infrared detection signal may be sent to the control component.

[0321] S152: When the infrared detection signal sent by the detection component is not received, the control component outputs a first level signal to the laser projection component, and after receiving the infrared detection signal sent by the detection component, the control component outputs a second level signal of a first duration to the laser projection component.

[0322] S153: When the control component outputs the first level signal, the laser projection component projects the display content to the laser projection area through the laser.

[0323] S154: When the control component outputs the second level signal, the laser projection component stops projecting the display content to at least one sub-area of ​​the laser projection area.

[0324] The control method of the laser projection device provided in the embodiment of the present application is a method for controlling the laser projection device in the above embodiment to protect human eyes. Its implementation principle and technical effect are similar and will not be repeated here.

[0325] The laser projection assembly projects display content upon receiving a first-level signal, including: if the received first-level signal is switched from a second-level signal, the laser projection assembly determines the duration of the first-level signal, and projects the display content if the duration of the first-level signal is not less than a duration threshold. Specific implementation methods can be found in the relevant description of the device embodiment above.

[0326] To put it another way, in some embodiments, after the output signal of the control component switches from the second level signal to the first level signal, the duration of the first level signal is obtained in real time, and when the duration of the first level signal is greater than or equal to a time length threshold, the laser projection component is controlled to resume projecting display content to at least one sub-area.

[0327] In some embodiments, the control method of the laser projection device further includes: performing power amplification processing on the infrared detection signal before the analog-to-digital converter converts the infrared detection signal from an analog signal to a digital signal.

[0328] In some embodiments, the control method of the laser projection device further includes: filtering the infrared detection signal after power amplification before the analog-to-digital converter converts the infrared detection signal from an analog signal to a digital signal.

[0329] In some embodiments, the detection assembly includes multiple detection elements, and the detection range includes multiple sub-areas corresponding to the multiple detection elements. Each detection element is configured to acquire an infrared detection signal within a corresponding sub-area. That is, the multiple detection elements are respectively configured to acquire pyroelectric infrared energy from different sub-areas of the laser projection area of ​​the laser projection assembly. Based on this, stopping the projection of the display content includes: if the infrared detection signal acquired by a target detection element among the multiple detection elements meets the activation condition, stopping the projection of the display content to the sub-area corresponding to the target detection element.

[0330] In one specific implementation, in the above-mentioned step S154, the laser projection component stops projecting display content to at least one sub-area of ​​the laser projection area, including: when the infrared detection signal obtained by the target detection element among the multiple detection elements meets the start-up condition (for example, the obtained pyroelectric infrared energy change rate is greater than or equal to the energy change rate threshold), stopping projecting display content to the sub-area corresponding to the target detection element.

[0331] In some embodiments, a laser projection assembly includes a mainboard and a laser. The mainboard is configured to control the laser. The laser is configured to generate laser light. The laser projection assembly uses the mainboard to control the laser's on / off state and the brightness of the laser light emitted by the laser.

[0332] In one specific implementation, the laser projection assembly stops projecting display content to at least one sub-area of ​​the laser projection area, including: when the infrared detection signals obtained by the multiple detection elements all meet the start-up conditions (for example, the change rate of the pyroelectric infrared energy obtained by the multiple detection elements is greater than or equal to the energy change rate threshold), controlling the laser to stop working through the mainboard.

[0333] To further reduce false detections, in some embodiments, the infrared detection signal includes multiple consecutive reading cycles of infrared detection signals, and the activation condition further includes the user being in proximity to the laser projection device during the multiple reading cycles. In this case, the specific implementation method for the laser projection device to determine whether the infrared detection signal meets the activation condition and the subsequent specific processing can be referred to the relevant description of the device embodiment above and will not be detailed here.

[0334] If the activation condition also includes the user being in proximity to the laser projection device during multiple reading cycles, the method further includes: determining the user's status during the multiple reading cycles based on the infrared detection signals of the multiple reading cycles, whether the user is away from the laser projection device or in proximity to the laser projection device; determining signal parameters of the infrared detection signals during the multiple reading cycles; and determining whether the infrared detection signals meet the activation condition based on the user's status during the multiple reading cycles and the signal parameters of the infrared detection signals during the multiple reading cycles. These operations can be performed by the control component. The specific implementation method can be referred to the relevant description of the device embodiment above, and will not be described in detail here.

[0335] In one specific implementation, determining a user's status during the multiple reading cycles based on the infrared detection signals of the multiple reading cycles includes: obtaining detection signals during the multiple reading cycles, the detection signals including a first flag and a second flag, the detection signals being obtained based on the infrared detection signals; determining the user's status during the multiple reading cycles based on the first flag included in the detection signals of the multiple reading cycles. Determining signal parameters of the infrared detection signals during the multiple reading cycles includes: determining the signal parameters of the infrared detection signals during the multiple reading cycles based on the second flag included in the detection signals of the multiple reading cycles.

[0336] In one specific implementation, the detection component includes at least one binary sensitive element, the binary sensitive element including a first sensitive element and a second sensitive element, the laser projection component further includes a laser; the binary sensitive element is located on a side close to the light outlet of the laser, and the laser projection device further includes a signal output component; before obtaining the detection signals of the multiple read cycles, the method further includes: determining, via the signal output component, a first direction of motion of the user between the first sensitive element and the second sensitive element in each read cycle, and determining a first flag bit based on the first direction of motion. The specific implementation method can be referred to the relevant description in the device embodiment above, and will not be described in detail here.

[0337] In one specific implementation, the first sensitive element and the second sensitive element are located side by side at different heights on a side close to the light outlet of the laser, and the height of the first sensitive element is greater than that of the second sensitive element. Based on the first movement direction, the first flag position is determined, including: if the first movement direction indicates that the user is making a transverse movement from the first sensitive element to the second sensitive element, then the first flag position is determined to indicate that the user is approaching the laser projection device; if the first movement direction indicates that the user is making a transverse movement from the second sensitive element to the first sensitive element, then the first flag position is determined to indicate that the user is moving away from the laser projection device. The specific implementation method can be referred to the relevant description in the device embodiment above, and will not be described in detail here.

[0338] In a specific implementation, the method further includes: determining a change speed of a signal parameter of the infrared detection signal of the plurality of reading cycles; and reducing a parameter threshold if the change speed is not less than a speed threshold.

[0339] In one specific implementation, when the infrared detection signal satisfies the activation condition for the human eye protection function, projecting the display content is stopped, including: determining the rate of change of a signal parameter of the infrared detection signal over multiple reading cycles; if the rate of change is not less than a rate threshold, reducing the parameter threshold in the activation condition; and if the infrared detection signal over the multiple reading cycles satisfies the activation condition after the parameter threshold is reduced, projecting the display content is stopped. The specific implementation method can be found in the relevant description of the device embodiment above and will not be elaborated here.

[0340] In one specific implementation, the method further includes: if it is detected that the user is away from the laser projection device, increasing the parameter threshold.

[0341] In some embodiments, after stopping projection of displayed content, if the user is detected to be away from the laser projection device, the parameter threshold in the activation condition is increased. In one specific implementation, based on the activation condition after the parameter threshold is increased, the eye protection function is controlled to be disabled, that is, projection of displayed content continues. The specific implementation method can be referred to the relevant description of the device embodiment above and will not be detailed here.

[0342] Next, please refer to Figure 44 to further explain the method of reducing false detection in the above embodiment.

[0343] Figure 44 is a flow chart of another control method for a laser projection device provided in an embodiment of the present application. In a specific implementation, the execution subject can be the laser projection device shown in any embodiment. Referring to Figure 44, the method includes the following steps S1001 to S1004.

[0344] S1001: Acquire a detection signal of a plurality of consecutive read cycles, where the detection signal includes a first flag bit and a second flag bit.

[0345] The detection signal is obtained based on the infrared detection signal.

[0346] S1002: Determine the state of the user in multiple reading cycles according to the first flag bit, and the state is far away from the laser projection device or close to the laser projection device.

[0347] S1003: For any detection signal, determine a signal parameter of the detection signal according to the second flag bit.

[0348] S1004: If the state is close to the laser projection device, and there is a signal parameter greater than or equal to the parameter threshold among the signal parameters of the multiple detection signals, the human eye protection function is triggered.

[0349] Exemplarily, the eye protection function can be used to turn off the laser of a laser projection device, or can be used to project a black picture card onto the projection screen to prevent the laser from damaging the user's eyes.

[0350] For the specific implementation of the above method steps, please refer to the relevant introduction in the above device embodiment, which will not be repeated here.

[0351] In this embodiment, the laser projection device can obtain detection signals of continuous reading cycles, and the detection signal includes a first flag bit and a second flag bit. According to the first flag bit, the user's status in multiple reading cycles is determined. For any detection signal, the signal strength value of the detection signal is determined according to the second flag bit. If the status is close to the laser device, and there is a signal strength value greater than or equal to a preset intensity threshold among the signal strength values ​​of the multiple detection signals, the human eye protection function is triggered. By judging whether the human eye protection function is triggered based on the user's status and signal strength, the accuracy of the judgment is improved, and the possibility of frequently triggering the human eye protection function and causing the screen to turn off can be reduced, thereby improving the user's viewing experience.

[0352] In order to further reduce false detections, different protection modes can be adopted for adult and child scenarios, that is, the user modes of adults and children are different.

[0353] In one specific implementation, the method further includes: determining a user mode based on signal parameters of the infrared detection signal, where the user mode is adult mode or child mode; and determining a parameter threshold based on the user mode. The specific implementation method can be found in the relevant description of the device embodiment above and will not be elaborated here.

[0354] In some embodiments, the parameter threshold in adult mode is greater than the parameter threshold in child mode.

[0355] In a specific implementation, stopping projecting and displaying content includes: when the user mode is a child mode, stopping projecting and displaying content; when the user mode is an adult mode, stopping projecting and displaying content after a first delay.

[0356] In some embodiments, if the user mode is child mode, the laser projection assembly stops projecting and displaying content upon receiving a first control signal; if the user mode is adult mode, the laser projection device stops projecting and displaying content after a first delay period upon receiving the first control signal. The specific implementation method can be found in the relevant description of the device embodiments above and will not be elaborated here.

[0357] Next, another control method of a laser projection device provided in an embodiment of the present application is described with reference to FIG45 .

[0358] Figure 45 is a flow chart illustrating another method for controlling a laser projection device according to an embodiment of the present application. In one specific implementation, the executing entity may be the laser projection device described in any of the aforementioned embodiments. In Figure 46 , the laser projection device is referred to as a laser device, and an example is provided in which a signal parameter includes signal intensity (also referred to as a signal intensity value). Referring to Figure 45 , the method includes the following steps: S1101 to S1111.

[0359] S1101: Determine a user mode according to a signal strength value corresponding to a target read cycle.

[0360] The user mode is an adult mode or a child mode, and the target reading cycle is at least one reading cycle among the multiple reading cycles.

[0361] S1102: Determine whether the user mode is adult mode.

[0362] If yes, execute S1103; if no, execute S1108.

[0363] S1103: Obtain a second intensity threshold.

[0364] The second intensity threshold is the intensity threshold in the adult mode.

[0365] S1104: Determine, based on the first flag bit, whether the user is in proximity to the laser device during multiple reading cycles.

[0366] If yes, then S1105 is executed. If no, it indicates that the state is far away from the laser device, and no operation may be performed to keep the screen display of the laser device.

[0367] S1105: For any detection signal, determine the signal strength value of the detection signal according to the second flag bit.

[0368] S1106: Determine whether there is a signal strength value greater than or equal to a second strength threshold among the signal strength values ​​of the multiple detection signals.

[0369] If so, execute S1107.

[0370] S1107: Triggering the eye protection function.

[0371] S1108: Obtain a third intensity threshold.

[0372] The third intensity threshold is the intensity threshold in the child mode.

[0373] S1109: Determine, based on the first flag bit, whether the user is in proximity to the laser device during multiple reading cycles.

[0374] If yes, then S1110 is executed. If no, it indicates that the state is far away from the laser device, and no operation may be performed to keep the screen display of the laser device.

[0375] S1110: For any detection signal, determine the signal strength value of the detection signal according to the second flag bit.

[0376] S1111: Determine whether there is a signal strength value greater than or equal to a third strength threshold among the signal strength values ​​of the multiple detection signals.

[0377] If so, execute S1107.

[0378] In this embodiment, its implementation method and technical effects are similar to the implementation method and technical effects of the corresponding technical means in the above embodiments, and this embodiment will not be repeated here.

[0379] Furthermore, based on the above embodiment, taking the user mode as adult mode as an example, the intensity threshold corresponding to the adult mode is the second intensity threshold, and Figure 46 is used to illustrate another control method of the laser projection device provided in the embodiment of the present application.

[0380] Figure 46 is a flow chart of another method for protecting human eyes of a laser device provided in an embodiment of the present application. In a specific implementation, the execution subject can be the laser projection device shown in any of the above embodiments. Referring to Figure 46, the following steps are included: S1201 to S1209.

[0381] S1201: Obtain a second intensity threshold.

[0382] S1202: Determine, based on the first flag bit, whether the user is in proximity to the laser device during multiple reading cycles.

[0383] If yes, then S1203 is executed. If no, it indicates that the state is far away from the laser device, and no operation may be performed to keep the screen display of the laser device.

[0384] S1203: Determine whether the change speed of the signal strength is greater than or equal to a preset speed threshold.

[0385] If yes, execute S1204; if no, execute 1208.

[0386] S1204: Reduce the second intensity threshold according to a preset ratio to obtain a reduced intensity threshold.

[0387] S1205: For any detection signal, determine the signal strength value of the detection signal according to the second flag bit.

[0388] S1206: Determine whether there is a signal strength value greater than or equal to the reduced strength threshold among the signal strength values ​​of the multiple detection signals.

[0389] If so, execute S1207.

[0390] S1207: Triggering the human eye protection function.

[0391] S1208: For any detection signal, determine the signal strength value of the detection signal according to the second flag bit.

[0392] S1209: Determine whether there is a signal strength value greater than or equal to a second strength threshold among the signal strength values ​​of the multiple detection signals.

[0393] If so, execute S1207.

[0394] In this embodiment, the implementation method and technical effects are similar, and will not be repeated here.

[0395] In conjunction with the above-described method of using a planar converging lens to acquire infrared detection signals, another embodiment of the present application provides a control method for a laser projection device, as shown in Figure 47 . Figure 47 is a schematic flow chart of another control method for a laser projection device provided in an embodiment of the present application. This method can be implemented using the laser projection device described in any of the above-described embodiments. As shown in Figure 47 , the method may include the following steps S4701 to S4704.

[0396] S4701: The image is projected onto the projection screen using the light beam emitted by the laser projection component through the lens.

[0397] S4702: The infrared light released by the user is focused onto the sensor through a planar converging lens.

[0398] S4703: Receive infrared light passing through the converging lens through the sensor, generate a control signal, and transmit the control signal to the processor.

[0399] S4704: Through the processor, control the laser projection component to be turned off according to the control signal so that the laser projection component does not emit a laser beam.

[0400] The control method of the laser projection device provided in this embodiment has similar implementation principles and technical effects as those of the laser projection device shown in any of the above embodiments, and will not be described in detail here.

[0401] The laser projection device provided in the embodiment of the present application can be used to execute the steps of the method shown in any of the above method embodiments. The specific implementation methods and technical effects are similar and will not be repeated here.

[0402] The present application also provides a control device for a laser projection device, the control device comprising:

[0403] An acquisition module is used to acquire infrared detection signals within a detection range, which includes a laser projection area;

[0404] The stopping module is used to stop projecting and displaying content when the infrared detection signal meets the activation conditions of the human eye protection function. The activation conditions include that the signal parameters of the infrared detection signal are not less than the parameter threshold, and the signal parameters include at least one of signal strength, intensity change rate, signal energy, and energy change rate.

[0405] In one embodiment, the control device is included in the laser projection device provided in any of the above embodiments. In one embodiment, the control device is part or all of the CPU, MCU, or control component in the laser projection device. The corresponding functions of the control device can be implemented through software, hardware, or a combination of software and hardware.

[0406] It should be noted that the control device for a laser projection device provided in the above embodiment only uses the division of the above-mentioned functional modules as an example to illustrate the control of the laser projection device. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. In addition, the control device for a laser projection device provided in the above embodiment and the control method embodiment of a laser projection device are based on the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0407] An embodiment of the present application also provides a computer-readable storage medium, which stores a computer program or program instructions. When the computer program or program instructions are executed by a processor, a control method for a laser projection device as shown in any of the above method embodiments is implemented. The specific implementation method and technical effect are similar and will not be repeated here.

[0408] In a specific implementation, the computer-readable storage medium may include: a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, an optical disk, or other media that can store program codes.

[0409] An embodiment of the present application also provides a computer program product, which includes a computer program or instructions. The computer program is stored in a computer-readable storage medium. At least one control module of the display device (such as at least one processor) can read the computer program from the computer-readable storage medium. When the at least one processor executes the computer program, it can implement the control method of the laser projection device shown in any of the above method embodiments. The specific implementation method and technical effects are similar and will not be repeated here.

[0410] 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 them. 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0411] For ease of explanation, the above description has been presented in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations are possible. The above embodiments have been selected and described to better explain the principles and practical applications, thereby enabling those skilled in the art to better utilize the embodiments and various variations of the embodiments suitable for specific use considerations.

[0412] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0413] Those skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware, or by a program to instruct the relevant hardware, and the program may be stored in a computer-readable storage medium, which may be a read-only memory, a disk, or an optical disk, etc.

[0414] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A laser projection device, characterized in that: include: Detection components, control components and laser projection components; The detection component is used to obtain an infrared detection signal within a detection range and send the infrared detection signal to the control component, wherein the detection range includes a laser projection area; The control component is used to send a first control signal to the laser projection component when the infrared detection signal meets the activation condition of the human eye protection function, and the activation condition includes that the signal parameter of the infrared detection signal is not less than the parameter threshold, and the signal parameter includes at least one of signal intensity, intensity change rate, signal energy, and energy change rate; The laser projection component is used to stop projecting display content when receiving the first control signal.

2. The laser projection device according to claim 1, characterized in that: The control component includes a first control component and a second control component, and the first control signal is a second level signal; The first control component is used to send a pulse signal to the second control component when the infrared detection signal meets the start condition; The second control component is used to send the second level signal to the laser projection component when receiving the pulse signal sent by the first control component.

3. The laser projection device according to claim 2, characterized in that: The second control component is further configured to send a first level signal to the laser projection component when the pulse signal sent by the first control component is not received; The laser projection component is further used to project display content when receiving the first level signal.

4. The laser projection device according to claim 3, characterized in that: The laser projection assembly is specifically used for: If the received first level signal is switched from the second level signal, the duration of the first level signal is obtained, and when the duration of the first level signal is not less than a time length threshold, the display content is projected.

5. The laser projection device according to any one of claims 1 to 4, characterized in that: The infrared detection signal includes infrared detection signals of a plurality of consecutive reading cycles, and the start condition further includes that the user is in a state of being close to the laser projection device during the plurality of reading cycles.

6. The laser projection device according to claim 5, characterized in that: The control component is also used for: Based on the infrared detection signals of the multiple reading cycles, determining the state of the user in the multiple reading cycles, the state being far away from the laser projection device or close to the laser projection device; determining signal parameters of the infrared detection signals of the plurality of reading cycles; Based on the state of the user in the multiple reading cycles and the signal parameters of the infrared detection signals in the multiple reading cycles, it is determined whether the infrared detection signal meets the start-up condition.

7. The laser projection device according to claim 6, characterized in that: The control component is specifically used for: Acquire detection signals of the plurality of read cycles, the detection signals comprising a first flag bit and a second flag bit, and the detection signals being obtained based on the infrared detection signal; Determining the state of the user in the multiple reading cycles based on the first flag bit included in the detection signals of the multiple reading cycles; Based on the second flag bits included in the detection signals of the multiple reading cycles, signal parameters of the infrared detection signals of the multiple reading cycles are determined.

8. The laser projection device according to claim 7, characterized in that: The detection component includes at least one dual-element sensitive element, and the dual-element sensitive element includes a first sensitive element and a second sensitive element. The laser projection component also includes a laser. The dual-element sensitive element is located on a side close to the light outlet of the laser. The laser projection device also includes a signal output component. The signal output component is used for: Determine a first movement direction of the user between the first sensitive element and the second sensitive element in each reading cycle, and determine the first flag bit based on the first movement direction.

9. The laser projection device according to claim 8, characterized in that: The first sensitive element and the second sensitive element are located side by side at different heights on one side close to the light outlet of the laser, and the height of the first sensitive element is greater than the height of the second sensitive element; The signal output component is specifically used for: If the first movement direction indicates that the user is performing a transverse movement from the first sensitive element to the second sensitive element, determining that the first flag indicates that the user is approaching the laser projection device; If the first movement direction indicates that the user is performing a transverse movement from the second sensitive element to the first sensitive element, it is determined that the first flag position indicates that the user is moving away from the laser projection device.

10. The laser projection device according to any one of claims 5 to 9, characterized in that: The control component is also used for: determining a rate of change of a signal parameter of the infrared detection signal of the plurality of reading cycles; If the changing speed is not less than the speed threshold, the parameter threshold is reduced.

11. The laser projection device according to any one of claims 1 to 10, characterized in that: The control component is also used for: determining a user mode based on a signal parameter of the infrared detection signal, the user mode being an adult mode or a child mode; Based on the user pattern, the parameter threshold is determined.

12. The laser projection device according to claim 11, characterized in that: The parameter threshold in the adult mode is greater than the parameter threshold in the child mode.

13. The laser projection device according to any one of claims 1 to 12, characterized in that: The laser projection assembly is specifically used for: If the user mode is the child mode, upon receiving the first control signal, stopping the projection of the display content; If the user mode is the adult mode, then upon receiving the first control signal, the projection and display of the content is stopped after a first delay.

14. The laser projection device according to any one of claims 1 to 13, characterized in that: The control component is also used for: If it is detected that the user is away from the laser projection device, the parameter threshold is increased.

15. The laser projection device according to any one of claims 1 to 14, characterized in that: The detection component includes a plurality of detection elements, the detection range includes a plurality of sub-areas corresponding to the plurality of detection elements one by one, and each detection element is used to obtain an infrared detection signal in a corresponding sub-area; The laser projection component is specifically used to stop projecting display content to the sub-area corresponding to the target detection element among the multiple detection elements when the infrared detection signal obtained by the target detection element meets the start-up condition.

16. The laser projection device according to any one of claims 1 to 15, characterized in that: The detection assembly includes a converging lens and a sensor, the laser projection assembly includes a lens, the converging lens is a planar structure, and the plane where the converging lens is located is parallel to the plane where the lens is located; The converging lens is used to converge the infrared light within the detection range onto the sensor; The sensor is used to receive the infrared light focused by the focusing lens to obtain the infrared detection signal.

17. The laser projection device according to claim 16, characterized in that: The converging lens includes a planar Fresnel lens, the Fresnel patterns in the planar Fresnel lens are incomplete Fresnel patterns, the detection range of the planar Fresnel lens in a first plane is smaller than the detection range of a planar Fresnel lens with complete Fresnel patterns in the first plane, and the first plane is perpendicular to the projection medium and perpendicular to the bearing surface of the laser projection device.

18. The laser projection device according to claim 17, characterized in that: A partial area of ​​the planar Fresnel lens at one end away from the projection screen has no Fresnel lines.

19. The laser projection device according to any one of claims 16 to 18, characterized in that: The surface of the converging lens is flush with the housing of the laser projection device.

20. A control method for a laser projection device, characterized in that: The method comprises: Acquiring an infrared detection signal within a detection range, wherein the detection range includes a laser projection area; When the infrared detection signal meets the activation condition of the human eye protection function, stop projecting the display content, and the activation condition includes that the signal parameter of the infrared detection signal is not less than the parameter threshold, and the signal parameter includes at least one of signal strength, intensity change rate, signal energy, and energy change rate.

21. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by the processor to implement the method as claimed in claim 20.

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