Laser projection equipment and human eye protection method

Abstract

The embodiment of the invention belongs to the technical field of display, and provides laser projection equipment and a human eye protection method, the laser projection equipment comprises a convergent lens, a sensor, a processor, a lens and a laser assembly, the convergent lens is of a plane structure, and the plane where the convergent lens is located is parallel to the plane where the lens is located. The lens is used for projecting a display image on the projection screen by using the light beam emitted by the laser assembly; the converging lens is used for converging the infrared light released by the user to the sensor; the sensor is used for receiving the infrared light passing through the converging lens, generating a control signal and transmitting the control signal to the processor; the processor is used for controlling the laser assembly not to emit laser beams according to the control signal. Therefore, by using the converging lens with the plane structure, the aesthetic property of the laser projection equipment can be improved, and the occupation of the internal space of the laser projection equipment is reduced.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of display technologies. More specifically, the present application relates to a laser projection device and a method for protecting human eyes. Background Art

[0002] A laser projection device can project an image on a projection screen to implement functions such as video playback. When a user watches a video played on the projection screen, there may be a situation where the user is relatively close to the projection screen or the laser projection device, which may cause damage to the human eyes.

[0003] Currently, in a laser projection device, a circular arc protrusion-shaped Fresnel lens is sunk into the interior of the laser projection device so that the Fresnel lens does not form a protrusion on the surface of the laser projection device, and a filter is added outside the Fresnel lens, so that the position where the circular arc protrusion-shaped Fresnel lens is installed in the laser projection device is a plane. In this way, when a user enters the detection range of the Fresnel lens, infrared rays emitted by the human body can enter the laser projection device through the filter and the Fresnel lens, and the laser projection device can adjust the brightness of the laser projection screen based on the incident infrared light beam to protect the human eyes.

[0004] However, the current method for protecting human eyes may have a situation where a user enters the detection range of the Fresnel lens but the human eye protection is not triggered, resulting in a poor effect of human eye protection. Summary of the Invention

[0005] Exemplary embodiments of the present application provide a laser projection device and a method for protecting human eyes, which can improve the effect of protecting human eyes by the laser projection device.

[0006] In a first aspect, the present application provides a laser projection device, which includes a converging lens, a sensor, a processor, a lens, and a laser assembly, and the plane where the converging lens is located is parallel to the plane where the lens is located;

[0007] The lens is configured to project and display an image on a projection screen by using a light beam emitted by the laser assembly;

[0008] The converging lens is configured to converge infrared light released by a user onto the sensor;

[0009] The sensor is configured to receive the infrared light passing through the converging lens, generate a control signal, and transmit the control signal to the processor;

[0010] The processor is configured to control the laser assembly to turn off according to the control signal, so that the laser assembly does not emit a laser beam.

[0011] In some embodiments of the present application, the converging lens includes a planar Fresnel lens, the Fresnel lines in the planar Fresnel lens are incomplete Fresnel lines, the detection distance of the planar Fresnel lens in the target direction is less than the detection distance of a planar Fresnel lens with complete Fresnel lines in the target direction, and the target direction is the direction in which the planar Fresnel lens is away from the projection screen.

[0012] In some embodiments of the present application, there are no Fresnel lines in a preset area at one end of the planar Fresnel lens away from the projection screen, and the ratio of the Fresnel lines on the planar Fresnel lens to the complete Fresnel lines is within a preset range.

[0013] In some embodiments of the present application, the number of the converging lenses is multiple, the multiple converging lenses are respectively installed on both sides of the lens, and the distance between the converging lens and the lens is less than or equal to a preset distance.

[0014] In some embodiments of the present application, the plane where the sensor is located is parallel to the plane where the converging lens is located.

[0015] In some embodiments of the present application, the surface of the converging lens is flush with the housing of the laser projection device.

[0016] In some embodiments of the present application, the processor is specifically configured to:

[0017] Determine the eye protection mode according to the control signal;

[0018] When the eye protection mode is the first mode, control the laser component to turn off;

[0019] When the eye protection mode is the second mode, after a preset duration, control the laser component to turn off.

[0020] In some embodiments of the present application, the processor is specifically configured to:

[0021] When the eye protection mode is the second mode, output a prompt message for prompting the user to stay away from the laser projection device;

[0022] After a preset duration, if the processor receives a control signal for controlling the laser component to turn off, control the laser component to turn off;

[0023] If the processor does not receive a control signal for controlling the laser component to turn off, do not control the laser component to turn off.

[0024] Second aspect, the present application provides a human eye protection method, which is applied to a laser projection device. The laser projection device includes a converging lens, a sensor, a processor, a lens, and a laser component. The plane where the planar Fresnel lens is located is parallel to the plane where the lens is located;

[0025] Through the lens, use the light beam emitted by the laser component to project and display an image on the projection screen;

[0026] Through the converging lens, converge the infrared light released by the user onto the sensor;

[0027] Through the sensor, receive the infrared light passing through the converging lens, generate a control signal, and transmit the control signal to the processor;

[0028] Through the processor, control the laser component to turn off according to the control signal, so that the laser component does not emit a laser beam.

[0029] Third aspect, the present application provides a computer-readable storage medium, on which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, the method described in the second aspect is implemented.

[0030] The computer-readable storage medium provided by the embodiments of the present application can execute the technical solutions in the above method embodiments, and the beneficial effects are similar, so they will not be elaborated here.

[0031] Fourth aspect, the present application provides a computer program product, including a computer program, which implements the method described in the second aspect when executed by a processor.

[0032] The computer program product provided by the embodiments of the present application can execute the technical solutions in the above method embodiments, and the beneficial effects are similar, so they will not be elaborated here. Description of the Drawings

[0033] In order to more clearly illustrate the embodiments of the present application or the implementation manners in the related art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the related art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings.

[0034] Figure 1-1 It is a schematic side view of the positions of a projection screen and a laser projection device provided by an embodiment of the present application;

[0035] Figure 1-2 It is a schematic front view of the positions of a projection screen and a laser projection device provided by an embodiment of the present application;

[0036] Figure 2 Schematic diagram of the Fresnel pattern of a Fresnel lens with an arc-shaped protrusion provided by an embodiment of the present application;

[0037] Figure 3 Schematic diagram of the detection range of a Fresnel lens with an arc-shaped protrusion provided by an embodiment of the present application;

[0038] Figure 4 Schematic diagram of the installation position of a Fresnel lens provided by an embodiment of the present application;

[0039] Figure 5 Schematic diagram of the installation position of a Fresnel lens provided by an embodiment of the present application;

[0040] Figure 6 Schematic diagram of a laser projection device provided by an embodiment of the present application;

[0041] Figure 7 Schematic diagram of the structure of a converging lens with a planar structure on a laser projection device provided by an embodiment of the present application;

[0042] Figure 8 Schematic diagram of a Fresnel lens including an incomplete planar Fresnel pattern provided by an embodiment of the present application;

[0043] Figure 9 Schematic diagram of the positional relationship between a lens and a converging lens provided by an embodiment of the present application;

[0044] Figure 10 Another schematic diagram of the positional relationship between a lens and a converging lens provided by an embodiment of the present application;

[0045] Figure 11-1 Schematic diagram of the detection range in a side view provided by an embodiment of the present application;

[0046] Figure 11-2 Schematic diagram of the detection range in a front view provided by an embodiment of the present application;

[0047] Figure 12 Schematic diagram of the flow of a human eye protection method provided by an embodiment of the present application. Detailed implementation manners

[0048] To make the objectives, implementation manners, and advantages of the present application clearer, the following will clearly and completely describe the exemplary implementation manners of the present application with reference to the accompanying drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only a part of the embodiments of the present application, rather than all of the embodiments.

[0049] It should be noted that the brief description of terms in this application is only for the convenience of understanding the following described embodiments, rather than intending to limit the embodiments of this application. Unless otherwise specified, these terms should be understood in their ordinary and common meanings.

[0050] In addition, the terms "comprising" and "having" and any variations thereof are intended to cover but not exclude inclusion. For example, a product or device comprising a series of components does not necessarily have to be limited to those components clearly listed, but may include other components not clearly listed or inherent to these products or devices.

[0051] For example, a laser projection device such as a laser TV, which includes a projection screen and a laser projection device, can project an image on the projection screen through the laser projection device to play a video on the projection screen. During the process of a user watching a video, there may be a situation where the user is relatively close to the laser projection device, and there may be a problem that the laser projection device causes damage to the user's eyes.

[0052] The positions of the projection screen and the laser projection device can be referred to Figure 1-1 and Figure 1-2 as shown in Figure 1-1 a schematic side view of the positions of a projection screen and a laser projection device provided in an embodiment of this application. Figure 1-2 a schematic front view of the positions of a projection screen and a laser projection device provided in an embodiment of this application.

[0053] As Figure 1-1 and Figure 1-2 shown, the laser projection device can emit a laser beam towards the projection screen to play a video on the projection screen. The user's viewing direction is perpendicular to the laser projection screen and the laser projection device. When the laser projection device emits a laser beam towards the projection screen to play a video, if the user approaches the laser projection device and records when the laser projection device is relatively close, the laser beam emitted by the laser projection device may cause damage to the user's eyes.

[0054] In some implementations, a sensor can be used to achieve human proximity detection to implement an eye protection function. Specifically, when a bare part of the human body enters the detection range, the sensor can receive the infrared energy emitted by the human body and output an electrical signal, and this electrical signal can be output to the control circuit through an amplifier circuit at the backend of the sensor, thereby controlling the light source to turn off or reduce the brightness to implement the eye protection function. When the human body is far away, the sensor has no electrical signal output, and the control circuit restores the normal working state of the light source.

[0055] To improve the detection effect of the sensor, a Fresnel lens with an arc-shaped protrusion can be covered above the sensor. The Fresnel lens can converge the infrared light emitted by the human body onto the receiving surface of the sensor, enabling the detection of whether there is a person within a certain range and improving the sensor sensitivity.

[0056] The Fresnel lines on the Fresnel lens with an arc-shaped protrusion can be seen in Figure 2 shown in Figure 2 which is a schematic diagram of the Fresnel lines of a Fresnel lens with an arc-shaped protrusion provided by an embodiment of the present application.

[0057] As Figure 2 shown, the Fresnel lines on the Fresnel lens with an arc-shaped protrusion are only a possible existing arrangement, and do not constitute any limitation.

[0058] The detection range of the Fresnel lens with an arc-shaped protrusion can be seen in Figure 3 shown in Figure 3 which is a schematic diagram of the detection range of a Fresnel lens with an arc-shaped protrusion provided by an embodiment of the present application.

[0059] As Figure 3 shown, the detection range of the Fresnel lens with an arc-shaped protrusion is conical.

[0060] Taking the installation of two Fresnel lenses with an arc-shaped protrusion on a laser projection device as an example, the two Fresnel lenses with an arc-shaped protrusion are as Figure 4 shown. Figure 4 This is a schematic diagram of the installation position of a Fresnel lens provided by an embodiment of the present application.

[0061] As Figure 4 shown, when installing two Fresnel lenses with an arc-shaped protrusion, holes need to be drilled on the surface of the laser projection device to install the two Fresnel lenses with an arc-shaped protrusion on the laser projection device. Since the Fresnel lens has an arc-shaped protrusion, it will form a protrusion on the laser projection device, which may make the appearance of the laser projection device uneven and affect the aesthetics of the laser projection device.

[0062] In some other implementations, the Fresnel lens with an arc-shaped protrusion is installed on the laser projection device by a hidden method. Specifically, the Fresnel lens with an arc-shaped protrusion is sunk into the interior of the laser projection device, and an infrared filter is covered above the Fresnel lens with an arc-shaped protrusion. The infrared filter is in the same plane as the housing of the laser projection device, making the appearance of the laser projection device flat. Taking the installation of two Fresnel lenses with an arc-shaped protrusion on a laser projection device as an example, the hidden installation method of the two Fresnel lenses with an arc-shaped protrusion is as Figure 5 shown. Figure 5 This is a schematic diagram of the installation position of a Fresnel lens provided by an embodiment of the present application.

[0063] However, in the above possible implementation, the surface of the arc-protruding Fresnel lens is equivalent to an infrared filter. By covering an infrared filter above the arc-protruding Fresnel lens, the infrared light emitted by the human body passes through two filters before reaching the sensor inside the laser projection device, which may cause attenuation of the infrared energy emitted by the human body received by the sensor, resulting in poor accuracy of the detection result. Moreover, sinking the arc-protruding Fresnel lens into the interior of the laser projection device makes the space occupied by the arc-protruding Fresnel lens in the laser projection device relatively large.

[0064] Based on this, the embodiments of the present application provide a laser projection device. A converging lens is installed on the laser projection device. The converging lens has a planar structure, and the plane where the converging lens is located is parallel to the plane where the lens of the laser projection device is located. In this way, since the converging lens has a planar structure, no protrusion is formed on the laser projection device, improving the aesthetics of the laser projection device. Moreover, since the thickness of the planar-structured converging lens is less than the thickness of the arc-protruding Fresnel lens, using the planar-structured converging lens can improve the eye protection effect while reducing the occupation of the internal space of the laser projection device.

[0065] In order to better understand the embodiments of the present application, the structure of the electronic device in the embodiments of the present application will be introduced below:

[0066] Figure 6 This is a schematic diagram of a laser projection device provided by an embodiment of the present application. As Figure 6 shown, after disassembling the upper housing of the laser projection device 10, the internal structure can be divided according to optical functions, including a light source assembly 100, an optical engine 200, and a lens 300. 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 can include a light source assembly of at least one color. For example, it can be a blue light source assembly, or it can be a two-color light source assembly, such as a blue light source assembly and a red light source assembly. Or, it can also be a three-color laser light source, including light source assemblies of three colors: red, green, and blue, for providing three-color laser modulation light.

[0067] The laser beam provided by the light source assembly 100 is combined and shaped and then enters the illumination optical path part in the optical engine 200. In the DLP projection architecture, the light modulation component chip is the core light modulation device.

[0068] Exemplarily, the light modulation component can be a digital micromirror chip (Digital Micromirror Device, DMD), which can reflect the light beam irradiating its surface into the lens 300.

[0069] The lens 300 can be an ultra-short throw projection lens. The ultra-short throw projection lens 300 is used to project an image light beam onto a projection screen, thereby realizing the display of a projection image. The laser projection device in the above example can be an ultra-short throw laser projection device.

[0070] In the embodiment of the present application, the laser projection device may further include a converging lens with a planar structure, a sensor, and a processor.

[0071] Among them, the converging lens is used to converge the infrared light released by the user onto the sensor. The converging lens with a planar structure can be a Fresnel lens.

[0072] The sensor is used to receive the infrared light passing through the converging lens with a planar structure, generate a control signal, and transmit the control signal to the processor.

[0073] The processor is used to control the laser component not to emit a laser beam according to the control signal.

[0074] Exemplarily, when the laser emitted by the laser component projects a projection beam onto the projection screen through the lens, the user can watch a video or an image on the projection screen. During the process of playing a video or an image on the projection screen, when the user enters the detection range of the converging lens with a planar structure, the infrared light emitted by the user's body can be converged onto the sensor through the converging lens of the structure. For example, it is converged 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 component not to emit a laser beam according to this control signal, so that the lens no longer emits a projection beam, so as to protect the user's eyes from being damaged by the laser.

[0075] Exemplarily, the control signal generated by the sensor can be a level signal that changes between high and low. For example, when the infrared light emitted by a moving heat source alternately passes through different regions of the lens, since the refractive indices of different regions on the lens are different, the infrared light received by the sensor alternates, and the sensor can output a level signal that changes between high and low.

[0076] It should be noted that an amplification circuit can also be included on the sensor. The amplification circuit can amplify the signal output by the sensor. For example, it can amplify the level signal generated by the sensor. This can reduce the situation where the processor cannot receive the signal because the signal transmitted to the processor is small.

[0077] Exemplarily, when the processor controls the laser component not to emit a laser beam according to the control signal, the processor can determine an eye protection mode according to the control signal; when the eye protection mode is the first mode, the laser component is controlled to turn off; when the eye protection mode is the second mode, after a preset time period, the laser component is controlled to turn off.

[0078] The preset duration can be 2 minutes or 5 minutes. The embodiments of the present application do not limit this.

[0079] The eye protection mode can be preset by the user or be the default of the device. The embodiments of the present application do not limit this. The first mode can be a mode that needs to turn off the laser component as soon as possible. For example, the first mode can be the children's mode. The first mode can also be a mode that does not need to turn off the laser component as soon as possible. For example, the second mode can be the standard mode.

[0080] In this way, according to different eye protection modes, the laser component is turned off at different times.

[0081] Exemplarily, when the 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.

[0082] The prompt message can be playing a voice. For example, playing the voice of "Please stay away from the laser projection device", or it can be in the way of displaying text or symbols on the projection screen. The embodiments of the present application do not make specific limitations on the prompt message.

[0083] Further, after the preset duration, 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 component to turn off, it controls the laser component to turn off; if the processor does not receive the control signal for controlling the laser component to turn off, it does not control the laser component to turn off.

[0084] After the preset duration, if the processor receives the control signal for controlling the laser component to turn off, it means that the user is still within the eye protection range, and then the laser component can be turned off. If the processor does not receive the control signal for controlling the laser component to turn off, it means that the user has stayed away from the laser projection device under the prompt of the prompt message, that is, has left the eye protection range, and then there is no need to turn off the laser component.

[0085] In this way, when the user enters the eye protection range, the user is first prompted to stay away. If the user does not stay away after a certain duration, the laser component is then turned off, which can reduce the situation of turning off the laser component.

[0086] Exemplarily, for the installation method of the converging lens with a planar structure on the laser projection device, reference can be made to Figure 7 as shown Figure 7 This is a schematic structural diagram of a converging lens with a planar structure on a laser projection device provided by an embodiment of the present application.

[0087] As Figure 7 shown, the plane where the converging lens with a planar structure is located is perpendicular to the plane where the lens is located, and the surface of the converging lens with a planar structure is flush with the outer shell of the laser projection device.

[0088] It should be noted that Figure 7 Taking the planar Fresnel lens being on the left side of the lens as an example for illustration does not constitute any limitation.

[0089] In the embodiments of the present application, the surface of the converging lens with a planar structure can be sunken, flush or convex with respect to the housing. In the embodiments of the present application Figure 7 Taking the surface of the converging lens with a planar structure being flush with the housing of the laser projection device as an example for illustration does not constitute any limitation.

[0090] It can be understood that when the surface of the converging lens with a planar structure is flush with the housing of the laser projection device, compared with the flush and convex modes, the flush mode can receive signals better.

[0091] In the embodiments of the present application, the converging lens with a planar structure can be a planar Fresnel lens, and of course, it can also be a converging lens in other forms. The embodiments of the present application do not make any limitations in this regard.

[0092] Taking the converging lens with a planar structure being a planar Fresnel lens as an example, combined with the above embodiments, it can be known that since the detection range of the Fresnel lens is conical, and the level of the energy received by the sensor will affect the detection distance and detection angle, therefore, the detection distance in the front of the Fresnel lens (i.e., the side of the Fresnel lens close to the user) is greater than the detection distances on both sides of the Fresnel lens. In the prior art, in order to increase the detection distances on both sides of the Fresnel lens, the gain of the amplifier circuit of the sensor can be increased to improve the sensitivity of the sensor.

[0093] However, after increasing the gain of the amplifier circuit of the sensor, although the detection distances on both sides of the Fresnel lens are increased, the distance in the front of the Fresnel lens is also increased. In this way, it may be possible that when a human body is at a safe distance, the Fresnel lens can detect the human body, resulting in a lower detection accuracy.

[0094] In the embodiments of the present application, the Fresnel lines in the planar Fresnel lens are incomplete Fresnel lines, and the detection distance of the planar Fresnel lens in the target direction is less than the detection distance of the planar Fresnel lens with complete Fresnel lines in the target direction, and the target direction is the direction in which the planar Fresnel is away from the projection screen.

[0095] Exemplarily, some Fresnel lines at the front of the planar Fresnel lens, that is, at the end close to the user, can be removed to shorten the detection distance in the front of the planar Fresnel lens.

[0096] In this way, by removing some Fresnel lines directly in front of the planar Fresnel lens, while increasing the gain of the amplifier circuit and the detection distance on both sides of the planar Fresnel lens, it is possible to achieve not increasing the detection distance directly in front of the planar Fresnel lens, reducing the misdetection of a user at a safe distance as entering an unsafe distance, thereby avoiding the situation of the optical engine of the laser projection device, and improving the user experience.

[0097] Exemplarily, there are no Fresnel lines in a preset area at the end of the planar Fresnel lens away from the projection screen, and the ratio of the Fresnel lines on the planar Fresnel lens to the complete Fresnel lines is within a preset range.

[0098] 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.

[0099] The preset area and the preset range can be set according to the actual situation, and the embodiments of the present application do not limit this.

[0100] For example, 1 / 4 to 1 / 3 of the Fresnel lines at the front end of the planar lens can be removed to reduce the energy intensity transmitted to the sensor directly in front, achieving the detection range to avoid false triggering directly in front and improving the user experience.

[0101] In the embodiments of the present application, the number of converging lenses can be multiple. The multiple converging lenses can be respectively installed on both sides of the lens, and the distance between the converging lens and the lens is less than or equal to a preset distance.

[0102] The number of converging lenses can be 2 or 4, and the embodiments of the present application do not limit this.

[0103] Exemplarily, 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 first evenly installed on the left and right sides of the lens, and then the remaining one can be installed on the left or right side of the lens.

[0104] The preset distance can be set according to data such as the actual size of the laser projection device, and the embodiments of the present application do not limit this.

[0105] Combined with the above embodiments, taking the converging lens as a Fresnel lens as an example, a planar Fresnel lens including incomplete Fresnel lines can be seen Figure 8 as shown Figure 8 which is a schematic diagram of a Fresnel lens including incomplete planar Fresnel lines provided by the embodiments of the present application.

[0106] As Figure 8As shown, the Fresnel lines at one end of the multiple planar Fresnel lenses installed on the laser projection device close to the user are incomplete.

[0107] In the embodiments of the present application, the number of planar Fresnel lenses is multiple, and the multiple planar Fresnel lenses are respectively installed on both sides of the lens, and the distance between the planar Fresnel lens and the lens is less than or equal to a preset distance.

[0108] The number of planar Fresnel lenses can be 2 or 4, and the embodiments of the present application do not limit this.

[0109] Exemplarily, when the number of planar Fresnel lenses is even, the same number of planar Fresnel lenses can be evenly installed on the left and right sides of the lens. When the number of planar Fresnel lenses is odd, the same number of planar Fresnel lenses can be evenly installed on the left and right sides of the lens first, and then the remaining one can be installed on the left or right side of the lens.

[0110] Exemplarily, multiple converging lenses can be spaced a certain distance from the lens on both sides of the lens, as Figure 9 shown. Figure 9 FIG. is a schematic diagram of the positional relationship between a lens and a converging lens provided by an embodiment of the present application. Of course, multiple converging lenses can be placed next to the lens on both sides of the lens and integrated with the lens, as Figure 10 shown. Figure 10 FIG. is another schematic diagram of the positional relationship between a lens and a converging lens provided by an embodiment of the present application.

[0111] In the prior art, when solving the problem that the detection distance in front of the Fresnel lens is large due to the increase in the amplification circuit, the sensor is installed obliquely to reduce the detection ability of the sensor in front of the Fresnel lens and reduce the detection distance in front of the Fresnel lens. However, the method of installing the sensor obliquely has an insignificant effect, and installing the sensor obliquely will waste the space inside the laser projection device.

[0112] In the embodiments of the present application, the plane where the sensor is located can be parallel to the plane where the planar structure converging lens is located. Since the planar structure converging lens is not installed obliquely, the sensor does not need to be installed obliquely either. In this way, by using the planar structure converging lens, the sensor can be installed in parallel in the laser projection device, and the space occupied by the sensor inside the laser projection device can be saved.

[0113] Combined with the above embodiments, taking the planar structure converging lens as the Fresnel lens as an example, when the laser projection device provided by the embodiments of the present application performs human body detection, the detection range can be referred to Figure 11-1 and Figure 11-2 shown.Figure 11-1 A schematic diagram of the detection range in a side view provided by an embodiment of the present application. Figure 11-2 A schematic diagram of the detection range in a front view provided by an embodiment of the present application.

[0114] An embodiment of the present application also provides a human eye protection method, as Figure 12 shown. Figure 12 A flowchart of a human eye protection method provided by an embodiment of the present application. This human eye protection method can be implemented by the laser projection device described in the above embodiment. As Figure 12 shown, this human eye protection method may include:

[0115] S1201. Through a lens, project and display an image on a projection screen using the light beam emitted by a laser component.

[0116] S1202. Through a converging lens, converge the infrared light emitted by a user onto a sensor.

[0117] S1203. Through the sensor, receive the infrared light passing through the converging lens, generate a control signal, and transmit the control signal to a processor.

[0118] S1204. Through the processor, control the laser component to turn off according to the control signal, so that the laser component does not emit a laser beam.

[0119] A human eye protection method provided by an embodiment of the present application has a similar implementation principle and technical effect to the laser projection device described in the above embodiment, and will not be elaborated here.

[0120] The present application also provides a computer-readable storage medium, which may include: various media that can store program codes such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disc. Specifically, program instructions are stored in the computer-readable storage medium, and the program instructions are used for the method in the above embodiment.

[0121] The present application also provides a program product, which includes execution instructions stored in a readable storage medium. At least one control module of a display device can read the execution instructions from the readable storage medium, and at least one control module executes the execution instructions to enable the display device to implement the human eye protection method provided by the above various embodiments.

[0122] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0123] For the sake of explanation, the above description has been presented in connection with specific embodiments. However, the above exemplary discussions are not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Many modifications and variations are possible in light of the above teachings. The selection and description of the embodiments are intended to best explain the principles and practical applications, thereby enabling those skilled in the art to best utilize the embodiments and various embodiments suitable for specific use considerations.

Claims

1. A laser projection device, characterized in that, The laser projection device includes a converging lens, a sensor, a processor, a lens, and a laser assembly. The converging lens has a planar structure, and the plane where the converging lens is located is parallel to the plane where the lens is located. The lens is used to project and display an image on a projection screen using the light beam emitted by the laser assembly. The converging lens is used to converge the infrared light released by the user onto the sensor. The sensor is used to receive the infrared light passing through the converging lens, generate a control signal, and transmit the control signal to the processor. The processor is used to control the laser assembly to turn off according to the control signal, so that the laser assembly does not emit a laser beam.

2. The laser projection device according to claim 1, wherein The converging lens includes a planar Fresnel lens. The Fresnel lines in the planar Fresnel lens are incomplete Fresnel lines. The detection distance of the planar Fresnel lens in the target direction is less than the detection distance of a planar Fresnel lens with complete Fresnel lines in the target direction. The target direction is the direction in which the planar Fresnel lens is away from the projection screen.

3. The laser projection device according to claim 2, characterized in that, There are no Fresnel lines in a preset area at one end of the planar Fresnel lens away from the projection screen, and the ratio of the Fresnel lines on the planar Fresnel lens to the complete Fresnel lines is within a preset range.

4. The laser projection device according to claim 1, characterized in that The number of the converging lenses is multiple. The multiple converging lenses are respectively installed on both sides of the lens, and the distance between the converging lens and the lens is less than or equal to a preset distance.

5. The laser projection device according to claim 4, characterized in that, The plane where the sensor is located is parallel to the plane where the converging lens is located.

6. The laser projection device according to any one of claims 1-5, characterized in that, The surface of the converging lens is flush with the housing of the laser projection device.

7. The laser projection device according to any one of claims 1-5, characterized in that, Specifically, the processor is used for: Determining an eye protection mode according to the control signal; When the eye protection mode is the first mode, controlling the laser assembly to turn off; When the eye protection mode is the second mode, controlling the laser assembly to turn off after a preset duration.

8. The laser projection device according to claim 7, wherein, Specifically, the processor is used for: When the eye protection mode is the second mode, outputting a prompt message for prompting the user to stay away from the laser projection device; After a preset duration, if the processor receives a control signal for controlling the laser assembly to turn off, controlling the laser assembly to turn off; If the processor does not receive a control signal for controlling the laser assembly to turn off, not controlling the laser assembly to turn off.

9. A method for protecting human eyes, characterized in that, Applied to a laser projection device, the laser projection device includes a flat converging lens, a sensor, a processor, a lens, and a laser assembly. The plane where the converging lens is located is parallel to the plane where the lens is located. Through the lens, using the light beam emitted by the laser assembly, project and display an image on a projection screen. Through the converging lens, converge the infrared light released by the user onto the sensor. Through the sensor, receive the infrared light passing through the converging lens, generate a control signal, and transmit the control signal to the processor. Through the processor, control the laser assembly to turn off according to the control signal, so that the laser assembly does not emit a laser beam.

10. A computer-readable storage medium, characterized in that, Computer-executable instructions are stored on the computer-readable storage medium, and when the computer-executable instructions are executed by a processor, the method described in claim 9 is implemented.

11. A computer program product, characterized in that, It includes a computer program which, when executed by a processor, implements the method described in claim 9.

Images