CN112687215A

CN112687215A - Laser projection apparatus and control method thereof

Info

Publication number: CN112687215A
Application number: CN202011579631.5A
Authority: CN
Inventors: 陈许; 吴凯
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-04-20
Anticipated expiration: 2040-12-28
Also published as: CN112687215B

Abstract

The application discloses laser projection equipment and a control method thereof, and belongs to the field of projection display. The laser projection equipment can switch the eye protection mode of the laser projection equipment into the target eye protection mode when the current eye protection mode of the laser projection equipment is determined to be different from the target eye protection mode corresponding to the type of the target object. Therefore, the eye protection mode of the laser projection equipment is dynamically adjusted according to the type of the target object, the flexibility of switching the eye protection mode is improved, and the reliability of eye protection is improved.

Description

Laser projection apparatus and control method thereof

Technical Field

The present disclosure relates to the field of projection display, and in particular, to a laser projection apparatus and a control method thereof.

Background

At present, after laser emitted by laser projection equipment is projected onto a projection screen, projection images can be projected onto the projection screen. However, since the laser light emitted from the laser projection apparatus has a high brightness, the laser light may cause damage to human eyes when the user is close to the projection screen.

Disclosure of Invention

The embodiment of the disclosure provides a laser projection device and a control method thereof, which can solve the problem that laser may cause damage to human eyes in the related art. The technical scheme is as follows:

in one aspect, a method for controlling a laser projection apparatus is provided, the method including:

receiving a detection signal of a target object in front of or at the side of the laser projection equipment in the process of projecting an image beam by the laser projection equipment;

determining the type of the target object according to the detection signal, wherein the type of the target object comprises children and adults;

determining a target eye protection mode based on the type of the target object;

and if the current eye protection mode of the laser projection equipment is different from the target eye protection mode, switching the eye protection mode of the laser projection equipment into the target eye protection mode.

Optionally, the detection signal is used for characterizing the heart rate of the target object; the determining the type of the target object according to the detection signal comprises:

if the heart rate of the target object is within a first heart rate range, determining that the type of the target object is a child;

if the heart rate of the target object is within a second heart rate range, determining that the type of the target object is an adult;

wherein an upper limit value of the first heart rate range is greater than or equal to a lower limit value of the second heart rate range.

Optionally, the detecting signal is used to characterize the position of the target object, and the determining the type of the target object according to the detecting signal includes:

if the change frequency of the position of the target object in the target duration is determined to be greater than a frequency threshold according to the detection signal, determining that the type of the target object is a child;

and if the change frequency of the position of the target object in the target duration is determined to be less than or equal to the frequency threshold according to the detection signal, determining that the type of the target object is an adult.

Optionally, if the number of the target objects is one, the determining the target eye protection mode based on the type of the target object includes:

if the type of the target object is a child, determining that the target eye protection mode is a child mode;

and if the type of the target object is an adult, determining that the target human eye protection mode is a standard mode.

Optionally, if the number of the target objects is multiple, the determining the target eye protection mode based on the type of the target object includes:

if the type of any one of the target objects is a child, determining that the target eye protection mode is a child mode;

and if the types of each target object in the plurality of target objects are adults, determining that the target human eye protection mode is a standard mode.

Optionally, the eye protection mode of the laser projection device includes a child mode and a standard mode; the method further comprises the following steps:

if the parameter value of the characteristic parameter is detected to be a first target value, setting the human eye protection mode of the laser projection equipment to be the child mode;

and if the parameter value of the characteristic parameter is detected to be a second target value, setting the human eye protection mode of the laser projection equipment as the standard mode.

Optionally, the detection signal is used for characterizing the position of the target object, and the method further includes:

detecting whether the position of the target object is within the protection range of human eyes;

if the position of the target object is located in the eye protection range and the eye protection mode of the laser projection equipment is a child mode, closing the projection picture;

and if the position of the target object is within the human eye protection range and the human eye protection mode of the laser projection equipment is a standard mode, changing the display of the projection picture.

Optionally, the human eye protection range includes a plurality of threshold detection ranges; the changing the display of the projection screen includes:

if the position of the target object is within a target threshold detection range, closing the projection picture;

if the position of the target object is in other threshold detection ranges except the target threshold detection range, displaying a prompt picture on the projection picture, and/or adjusting the brightness of the projection picture;

the prompt picture changes according to the change of the detection signal of the target object, and the distance upper limit of the target threshold detection range is smaller than the distance lower limits of the other threshold detection ranges.

Optionally, the detecting whether the position of the target object is within the protection range of human eyes includes:

if the eye protection mode of the laser projection equipment is the child mode, detecting whether the position of the target object is located in the eye protection range at intervals of a first interval;

if the eye protection mode of the laser projection equipment is the standard mode, detecting whether the position of the target object is located in the eye protection range or not at intervals of a second interval;

wherein the first interval is greater than the second interval.

In another aspect, there is provided a laser projection apparatus, configured to:

In yet another aspect, there is provided a laser projection apparatus including: a memory, a processor and a computer program stored on the memory, the processor implementing the method of controlling a laser projection apparatus as described in the above aspect when executing the computer program.

In yet another aspect, a computer-readable storage medium is provided, in which instructions are stored, the instructions being loaded and executed by a processor to implement the control method of the laser projection apparatus according to the above aspect.

In a further aspect, a computer program product containing instructions is provided, which when run on the computer causes the computer to perform the method of controlling a laser projection apparatus of the above aspect.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:

the embodiment of the disclosure provides laser projection equipment and a control method thereof, and in the control method, the laser projection equipment can switch the eye protection mode of the laser projection equipment to the target eye protection mode when determining that the current eye protection mode of the laser projection equipment is different from the target eye protection mode corresponding to the type of a target object. Therefore, the eye protection mode of the laser projection equipment is dynamically adjusted according to the type of the target object, the flexibility of switching the eye protection mode is improved, and the reliability of eye protection is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a laser projection apparatus provided in an embodiment of the present disclosure;

fig. 2 is a flowchart of a control method of a laser projection apparatus provided in an embodiment of the present disclosure;

FIG. 3 is a flowchart of another control method for a laser projection apparatus provided by an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a first target location of a target object provided by an embodiment of the present disclosure;

fig. 5 is a flowchart of a control method of another laser projection apparatus provided by an embodiment of the present disclosure;

FIG. 6 is a flow chart illustrating a method for changing a display of a projected picture according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram of a target distance between a detection device and a target object according to an embodiment of the disclosure;

FIG. 8 is a schematic structural diagram of another laser projection apparatus provided in an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of another laser projection apparatus provided in the embodiments of the present disclosure;

fig. 10 is a schematic diagram of a detection signal emitted by a signal emitter according to an embodiment of the disclosure;

FIG. 11 is a schematic diagram of a detection signal emitted by another signal emitter provided by the embodiments of the present disclosure;

FIG. 12 is a schematic diagram of another signal emitter emitting a detection signal and a signal receiver receiving the detection signal reflected by a target object provided by the embodiments of the present disclosure;

fig. 13 is a schematic diagram of a difference signal provided by the embodiment of the disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a laser projection apparatus provided in an embodiment of the present disclosure. As shown in fig. 1, the laser projection apparatus may include a housing 00 and a detection device 10.

Wherein, referring to fig. 1, the detection device 10 is located at a side of the housing 00 away from the display screen 20, or the detection device 10 is located at a side of the housing 00, which side intersects with the display screen 20. The first detection angle of the detection device 10 in the first plane is larger than 0 and smaller than 150 degrees. The second detection angle of the detection device 10 in the second plane is larger than 0 and smaller than 110 degrees. Alternatively, the detection angle refers to an angle that can be detected by the detection device 10, and the first plane is parallel to the bearing surface of the laser projection apparatus. The second plane is perpendicular to the first plane. Alternatively, the detection device 10 may be a millimeter wave sensor, and the detection signal may be a millimeter wave detection signal.

The detection device 10 is configured to emit a detection signal and to receive a detection signal reflected by the target object 001, and the detection signal may be used to characterize the position and/or heart rate of the target object 001. The target object 001 may be a human or animal located within the detection range of the detection device 10. The laser projection apparatus is configured to project an image beam onto the display screen 20 to display a projection picture on the display screen 20.

Fig. 2 is a flowchart of a control method of a laser projection apparatus according to an embodiment of the present disclosure. The control method may be applied to the laser projection apparatus shown in fig. 1. As shown in fig. 2, the method may include:

step 201, in the process of projecting the image beam by the laser projection device, receiving a detection signal of a target object in front of or at the side of the laser projection device.

In the process of projecting the image beam by the laser projection equipment, a detection device in the laser projection equipment can emit a detection signal in real time and can receive the detection signal reflected by a target object in front of or on the side of the laser projection equipment in real time.

Step 202, determining the type of the target object according to the detection signal.

The laser projection device may determine the type of the target object based on the detection signal after receiving the detection signal of the target object. The types of the target object may include children and adults, among others.

Step 203, determining a target eye protection mode based on the type of the target object.

The laser projection equipment is pre-stored with the corresponding relation between the type of the target object and the human eye protection mode. The eye protection mode of the laser projection device may include a child mode and a standard mode. The eye protection mode corresponding to the child is a child mode, and the eye protection mode corresponding to the adult is a standard mode.

After determining the type of the target object, the laser projection device may determine, from the corresponding relationship, a target eye protection mode corresponding to the type of the target object. For example, if the type of the target object is a child, the laser projection device may determine that the target eye protection mode is a child mode from the correspondence relationship.

And 204, if the current eye protection mode of the laser projection equipment is different from the target eye protection mode, switching the eye protection mode of the laser projection equipment into the target eye protection mode.

After determining the target eye protection mode, the laser projection device may detect whether the target eye protection mode is the same as the current eye protection mode of the laser projection device. If the current eye protection mode of the laser projection equipment is different from the target eye protection mode, the laser projection equipment can switch the eye protection mode of the laser projection equipment into the target eye protection mode. If it is detected that the current eye protection mode of the laser projection device is the same as the target eye protection mode, the laser projection device may keep the current eye protection mode unchanged.

For example, if the target eye protection mode is the child mode and the current eye protection mode of the laser projection device is the standard mode, the laser projection device may switch the eye protection mode to the child mode.

The laser projection equipment can adjust the brightness of a projection picture based on the position of a target object in any human eye protection mode, so that human eyes are effectively protected.

To sum up, the embodiment of the present disclosure provides a control method for a laser projection device, in which the laser projection device may switch a current eye protection mode of the laser projection device to a target eye protection mode when it is determined that the current eye protection mode of the laser projection device is different from the target eye protection mode corresponding to the type of the target object. Therefore, the eye protection mode of the laser projection equipment is dynamically adjusted according to the type of the target object, the flexibility of switching the eye protection mode is improved, and the reliability of eye protection is improved.

Fig. 3 is a flowchart of another control method of a laser projection apparatus according to an embodiment of the present disclosure. The control method may be applied to the laser projection apparatus shown in fig. 1. As shown in fig. 3, the method includes:

step 301, receiving a detection signal of a target object in front of or at a side of the laser projection device during the process of projecting the image beam by the laser projection device.

In the process of projecting the image beam by the laser projection equipment, a detection device in the laser projection equipment can emit a detection signal in real time and can receive the detection signal reflected by a target object in front of or at the side of the laser projection equipment in real time.

Step 302, determining the type of the target object according to the detection signal.

In an optional implementation manner of the embodiment of the present disclosure, the detection signal may be used to characterize a heart rate of the target object, and the laser projection device may detect a heart rate range in which the heart rate of the target object is located. If the heart rate of the target object is within the first heart rate range, the laser projection device may determine that the type of the target object is a child. If the heart rate of the target object is within the second heart rate range, the laser projection device may determine that the type of the target object is an adult.

The lower limit value of the first heart rate range is greater than or equal to the upper limit value of the second heart rate range, and the first heart rate range and the second heart rate range can be fixed heart rate ranges pre-stored in the laser projection device. For example, the lower limit value of the first heart rate range may be 80 times/min, and the upper limit value may be 100 times/min. The lower limit of the second heart rate range may be 60 times/min and the upper limit may be 80 times/min.

Optionally, the laser projection device may determine a plurality of heart rates of the target object according to the detection signal received within the target time duration. And determining the average value of the plurality of heart rates as the heart rate of the target object. The laser projection device may then detect the heart rate range in which the heart rate is located. The target duration may be a fixed duration pre-stored in the laser projection device.

For example, if the heart rate of the target object determined by the laser projection device is 90 times/min, the lower limit value of the first heart rate range is 80 times/min, and the upper limit value of the first heart rate range is 100 times/min, since the heart rate of the target object is 90 times/min in the first heart rate range, the laser projection device may determine the type of the target object as a child.

Optionally, the laser projection device may determine the beating amplitudes of the heart of the target object at every two adjacent moments according to the detection signal received within the target time duration, so as to obtain a plurality of beating amplitudes. And then the laser projection equipment can carry out angle conversion on the plurality of jumping amplitudes to obtain a plurality of angle variation quantities. Further, the laser projection device may determine a change frequency of the angle based on the plurality of angle change amounts, and determine a heart rate of the target object based on the change frequency of the angle.

For example, the detection signal may be a millimeter wave signal, and the jitter amplitude may be greater than or equal to 4 millimeters (mm) and less than or equal to 12 mm.

In the embodiment of the disclosure, the laser projection device may display an interactive interface in the process of determining the first heart rate range, where the interactive interface may display first prompt information, and the first prompt information is used for prompting a child to interact within a specified range. For example, the first prompt message may be: please the child wave his arm or shake his body at a distance of 1 meter (m) from the laser projection apparatus. In this process, the laser projection device may determine an average value of a plurality of heart rates determined by the received plurality of detection signals as a first heart rate of the child, and then the laser projection device periodically acquires the plurality of first heart rates of the child. Thereby obtaining the first heart rate range.

Similarly, the laser projection device may display an interactive interface in the process of determining the second heart rate range, and second prompt information may be displayed in the interactive interface, where the second prompt information is used to prompt an adult to interact within a specified range. For example, the second prompt message may be: please make an adult wave an arm or shake a body at a distance of 1m from the laser projection apparatus. In this process, the laser projection device may determine an average of a plurality of heart rates determined from the received plurality of detection signals as the second heart rate of the adult. The laser projection device then periodically acquires a plurality of second heart rates of the adult, thereby obtaining the second heart rate range.

In another optional implementation manner of the embodiment of the present disclosure, the detection signal is further used for characterizing a position of the target object, and the laser projection device may determine a change frequency of the position of the target object within the target duration according to the detection signal. The laser projection device may then detect whether the transform frequency is greater than a frequency threshold. If the change frequency is greater than the frequency threshold, the laser projection device may determine that the position of the target object is in rapid change within the target duration, and thus the laser projection device may determine that the type of the target object is a child. If the change frequency is less than or equal to the frequency threshold, the laser projection device may determine that the position of the target object changes more slowly within the target duration, and the laser projection device may determine that the type of the target object is an adult. Wherein the frequency threshold may be a fixed frequency pre-stored in the laser projection device.

The position of the target object may include a target distance d between the target object 001 and the detection device 10 and an azimuth angle β of the target object 001, among others. Referring to fig. 4, the laser projection apparatus may establish a coordinate system, which may include a horizontal axis X and a vertical axis Y, with the position of the detection device 10 as an origin. If the detection device 10 is a millimeter wave sensor, the detection signal is a millimeter wave signal. The laser projection apparatus may determine a difference signal from the received detection signal and determine a target distance d between the target object 001 and the detection device 10 from a peak frequency of the difference signal. And, the laser projection apparatus may determine the azimuth angle β at the target object 001 according to the difference of the phase angles of two adjacent difference signals. Wherein, the azimuth angle β is an included angle between a connecting line between the target object 001 and the XY origin of the coordinate system and the horizontal axis X. For example, the target distance d between the target object 001 and the laser projection apparatus may be 1 m.

Alternatively, the laser projection device may detect whether the target distance of the target object and the change frequency of the azimuth angle of the target object are greater than the frequency threshold, respectively. If the change frequency of the target distance of the target object is greater than the frequency threshold, and/or the change frequency of the azimuth angle of the target object is greater than the frequency threshold, the laser projection device may determine that the change frequency of the position of the target object is greater than the frequency threshold. If both the change frequency of the target distance of the target object and the change frequency of the azimuth angle of the target object are less than or equal to the frequency threshold, the laser projection apparatus may determine that the change frequency of the position of the target object is less than or equal to the frequency threshold.

In yet another alternative implementation of the embodiment of the present disclosure, the detection signal may be used to characterize the heart rate and position of the target object. When the fact that the heart rate of the target object is within the first heart rate range and the change frequency of the position of the target object within the target duration is larger than the frequency threshold value is detected, the type of the target object is determined to be a child. And when the laser projection equipment detects that the heart rate of the target object is in a second heart rate range and the change frequency of the position of the target object in the target time length is less than or equal to a frequency threshold value, determining that the type of the target object is an adult.

Step 303, determining a target eye protection mode based on the type of the target object.

The laser projection equipment is pre-stored with the corresponding relation between the type of the target object and the human eye protection mode. The eye protection mode of the laser projection device may include a child mode and a standard mode, the eye protection mode corresponding to the child is the child mode, and the eye protection mode corresponding to the adult is the standard mode.

In an optional implementation manner of the embodiment of the present disclosure, if the number of the target objects is one, the laser projection device may determine that the target eye protection mode is the child mode if the type of the target object is a child. If the type of the target object is an adult, the laser projection apparatus may determine that the target human eye protection mode is the standard mode.

For example, if the number of target objects is one and the type of the target object is a child, the laser projection device may determine that the target eye protection mode is a child mode.

In another optional implementation manner of the embodiment of the present disclosure, if the number of the target objects is multiple, the laser projection device may determine that the target eye protection mode is the child mode if the type of any one of the multiple target objects is a child. If the type of each of the plurality of target objects is an adult, the laser projection device may determine that the target eye protection mode is a standard mode.

And 304, detecting whether the current eye protection mode of the laser projection equipment is the same as the target eye protection mode.

After determining the target eye protection mode, the laser projection device may detect whether the target eye protection mode is the same as the current eye protection mode of the laser projection device. If it is detected that the current eye protection mode of the laser projection device is different from the target eye protection mode, the laser projection device may execute step 305. If it is detected that the current eye protection mode of the laser projection device is the same as the target eye protection mode, the laser projection device may keep the current eye protection mode unchanged, and continue to execute step 301.

And 305, switching the eye protection mode of the laser projection equipment to a target eye protection mode.

If the laser projection equipment detects that the current eye protection mode is different from the target eye protection mode, the laser projection equipment can switch the eye protection mode to the target eye protection mode, so that the eye protection mode of the laser projection equipment is adjusted to the target eye protection mode corresponding to the type of the target object.

And step 306, if the parameter value of the characteristic parameter is detected to be the first target value, setting the human eye protection mode of the laser projection equipment to be a child mode.

In the disclosed embodiments, the laser projection device may display a setting button with a human eye protection mode. The laser projection device may display a setting interface of the eye protection mode after detecting a selection operation of a user on a setting button of the eye protection mode, where the setting interface of the eye protection mode may include a selection button of a child mode and a selection button of a standard mode. The laser projection device may set the parameter value of the characteristic parameter to the first target value upon detecting a selection instruction of the user for the selection button of the child mode. The laser projection apparatus may set the parameter value of the characteristic parameter to the second target value after detecting a selection instruction of the user for the selection button of the standard mode.

After the laser projection equipment adjusts the human eye protection mode of the laser projection equipment according to the type of the target object, whether the parameter value of the characteristic parameter is the first target value or not can be detected. If the parameter value of the characteristic parameter is detected to be the first target value, the human eye protection mode of the laser projection device can be set to be the child mode.

And 307, if the parameter value of the characteristic parameter is detected to be the second target value, setting the human eye protection mode of the laser projection equipment to be a standard mode.

If the laser projection device detects that the parameter value of the characteristic parameter is the second target value, the laser projection device may set the eye protection mode of the laser projection device to the standard mode.

It should be noted that the order of the steps of the control method for the laser projection apparatus provided in the embodiment of the present disclosure may be appropriately adjusted, and the steps may also be deleted according to the situation. For example, step 306 and step 307 may be deleted as the case may be, or step 306 and step 307 may be performed at step 301. Any method that can be easily conceived by those skilled in the art within the technical scope of the present disclosure is covered by the protection scope of the present disclosure, and thus, the detailed description thereof is omitted.

To sum up, the embodiment of the present disclosure provides a control method for a laser projection device, in which the laser projection device may switch a current eye protection mode of the laser projection device to a target eye protection mode when it is determined that the current eye protection mode is different from a target eye protection mode corresponding to a type of the target object. Therefore, the eye protection mode of the laser projection equipment is dynamically adjusted according to the type of the target object, the flexibility of switching the eye protection mode is improved, and the reliability of eye protection is improved.

Fig. 5 is a flowchart of another control method of a laser projection apparatus provided in an embodiment of the present disclosure, and the control method may be applied to the laser projection apparatus shown in fig. 1. As shown in fig. 5, the method may include:

step 501, receiving a detection signal of a target object in front of or at the side of the laser projection equipment in the process of projecting the image beam by the laser projection equipment.

In the process of projecting the image beam by the laser projection equipment, a detection device in the laser projection equipment can emit a detection signal in real time and can receive the detection signal reflected by a target object in front of or on the side of the laser projection equipment in real time. Wherein the detection signal may be used to characterize the position of the target object.

Step 502, detecting whether the position of the target object is within the human eye protection range.

After determining the position of the target object, the laser projection device can detect whether the position of the target object is within the protection range of human eyes. If the position of the target object is within the eye protection range, the laser projection apparatus may determine that the distance between the target object and the laser projection apparatus is short, and the laser beam emitted by the laser projection apparatus may damage the eyes of the target object, then step 503 may be performed. If the position of the target object is not within the eye protection range, the laser projection device may determine that the distance between the target object and the laser projection device is long, and the laser beam emitted by the laser projection device does not damage the eyes of the target object, and then step 501 may be continuously performed. Wherein the human eye protection range is a fixed range pre-stored in the laser projection device.

For example, if the distance between the target object and the laser projection apparatus is 1m, the upper limit of the detection distance corresponding to the human eye protection range is 1.5m, and since the 1m is smaller than the 1.5m, the laser projection apparatus may determine that the position of the target object is within the human eye protection range, and thus the laser projection apparatus may perform step 503.

Step 503, detecting whether the eye protection mode of the laser projection device is a child mode.

The laser projection device may detect whether its eye-protection mode is a child mode after determining that the position of the target object is within the eye-protection range. If the eye protection mode of the laser projection device is detected as the child mode, the laser projection device may execute step 504. If the eye protection mode of the laser projection apparatus is detected as the standard mode, step 505 may be executed.

Step 504, the projection picture is closed.

The laser projection equipment is in the eye protection range in the position of confirming the target object, and the eye protection mode of laser projection equipment is behind the children's mode, can close the projection picture, avoids the laser of laser projection equipment outgoing to cause the injury to children's eyes from this, effectively protects children's eyes.

And 505, changing the display of the projection picture.

The laser projection equipment can change the display of a projection picture after determining that the position of the target object is in the human eye protection range and the human eye protection mode of the laser projection equipment is a standard mode.

In an alternative implementation manner of the embodiment of the present disclosure, the human eye protection range may include a plurality of threshold detection ranges. Referring to fig. 6, this step 505 may include:

step 5051, detecting whether the position of the target object is within the target threshold detection range.

If the position of the target object is within the target threshold detection range, the laser projection device may determine that the target distance between the target object and the laser projection device is very short, and at this time, the laser emitted by the laser projection device may cause great damage to the eyes of the target object, and then the laser projection device may execute step 5052. If the position of the target object is in the other threshold detection range except the target threshold detection range, the laser projection device may determine that the target distance between the target object and the laser projection device is short, and at this time, the laser emitted by the laser projection device may cause little damage to human eyes, the laser projection device may perform step 5053, or the laser projection device may perform step 5054, or the laser projection device may perform step 5053 and step 5054 simultaneously.

The upper limit of the detection distance corresponding to the target threshold detection range is smaller than the lower limits of the detection distances corresponding to other threshold detection ranges. For example, the upper limit of the detection distance corresponding to the target threshold detection range may be 0.5m, the lower limit may be 0m, and the lower limit of the detection distance corresponding to the other threshold detection range may be greater than 0.5m, and the upper limit may be 1.5 m.

In the embodiment of the present disclosure, if it is determined that the target distance of the target object is less than or equal to the upper limit of the target threshold detection range, the laser projection device may determine that the position of the target object is within the target threshold detection range. If the laser projection device determines that the target distance of the target object is greater than the upper limit of the target threshold detection range and less than or equal to the upper limit of the other threshold detection range, it may determine that the position of the target object is within the other threshold detection range. If the laser projection equipment determines that the target distance of the target object is larger than the upper limit of the other threshold detection range, the laser projection equipment can determine that the position of the target object is not in the human eye protection range.

Step 5052, the projection screen is closed.

After detecting that the position of the target object is within the target threshold detection range, the laser projection device may close the projection screen, that is, adjust the brightness of the projection screen to 0.

In step 5053, the brightness of the projected image is adjusted.

Optionally, if the multiple threshold detection ranges may include a first threshold detection range, a second threshold detection range, and a third threshold detection range, the detection distances and/or the detection angles corresponding to the different threshold detection ranges are different. The detection distance is the distance between the target object and the detection device, and the detection angle is the angle of the target object relative to the detection device. The other threshold detection range may include a first threshold detection range and a second threshold detection range, and the target threshold detection range may be the third threshold detection range.

The upper limit of the detection distance corresponding to the first threshold detection range is smaller than or equal to the distance threshold, the lower limit of the detection distance corresponding to the first threshold detection range is larger than the upper limit of the detection distance corresponding to the second threshold detection range, and the lower limit of the detection distance corresponding to the second threshold detection range is larger than the upper limit of the detection distance corresponding to the third threshold detection range. That is, the upper limit of the detection distance corresponding to the third threshold detection range is smaller than the lower limit of the detection distance corresponding to the first threshold detection range and the second threshold detection range.

For example, the distance threshold may be 1.5 m. The upper limit of the detection distance corresponding to the first threshold detection range may be 1.5m, and the lower limit may be greater than 1 m. The upper limit of the detection distance corresponding to the second threshold detection range may be 1m, and the lower limit is greater than 0.5 m. The upper limit of the detection distance corresponding to the third threshold detection range may be 0.5m, and the lower limit may be 0.

The laser projection equipment is stored with a corresponding relation between a threshold detection range and brightness in advance, the first threshold detection range corresponds to a first brightness, the second threshold detection range corresponds to a second brightness, wherein the first brightness is 80% of an original brightness, the second brightness is 50% of the original brightness, and the original brightness is the brightness of a projection picture when the brightness of the projection picture is not adjusted.

After determining that the position of the target object is in the other threshold detection range, the laser projection device may determine, based on the correspondence between the threshold detection range and the brightness, the brightness corresponding to the threshold detection range in which the position of the target object is located, and adjust the brightness of the projection screen to the brightness.

If the position of the target object is within the first threshold detection range, the laser projection device may adjust the brightness of the projection screen to a first brightness. If the position of the target object is within the second threshold detection range, the laser projection device may adjust the brightness of the projection screen to a second brightness.

For example, assuming that the correspondence relationship between the detection distance and the brightness corresponding to the threshold detection range is as shown in table 1, referring to table 1 and fig. 7, if the target distance d of the target object is 1m, it can be determined from table 1 that the target distance 1m is within the detection distance corresponding to the second threshold detection range included in the other threshold detection ranges. The second brightness corresponding to the second threshold detection range is 50% of the original brightness, and the laser projection device may adjust the brightness of the projection screen to be 50% of the original brightness.

TABLE 1

Detecting distance	Brightness of light
		[0，0.5m]	0
(0.5m，1m]	50% of the original brightness
		(1m，1.5m]	80% of the original brightness

In step 5054, a prompt screen is displayed on the projection screen.

The laser projection device may display a prompt screen on the projection screen after determining that the position of the target object is within the other threshold detection range. The prompt screen is used for prompting the position of the target object, and the prompt screen can be changed according to the position change of the target object. Optionally, the prompt screen may include at least one of text information and image information. For example, if the target distance d of the target object is 1m, the prompt screen may be: the distance between the laser projection device and the current position of the user is 1m, and the user is far away from the laser projection device.

In the embodiment of the present disclosure, the laser projection device may display the prompt picture on the projection picture, and simultaneously keep the playing state of the projection picture unchanged, that is, the laser projection device plays the projection picture transmitted by the front-end device in real time.

Step 506, playing the audio through the audio player.

In the embodiment of the present disclosure, the laser projection apparatus may further include an audio player, and after determining that the position of the target object is within the eye protection range, the laser projection apparatus may play audio through the audio player, where the audio is used to prompt the position of the target object, and the audio may be changed according to a change in the position of the target object.

For example, if the target distance d is 1m, the audio played by the audio player may be: the distance between the laser projection device and the current position of the user is 1m, and the user is away from the laser projection device for protecting eyes of the user.

And step 507, determining the type of the target object according to the detection signal.

Step 508, determining a target eye protection mode based on the type of the target object.

Step 509, detecting whether the current eye protection mode of the laser projection device is the same as the target eye protection mode.

And step 510, switching the eye protection mode of the laser projection equipment to a target eye protection mode.

The above method embodiments may be referred to in the execution process of steps 507 to 510, and the embodiments of the present disclosure are not described herein again.

In the embodiment of the present disclosure, when the laser projection apparatus determines that the eye protection mode of the laser projection apparatus is the child mode, the laser projection apparatus may perform the step 502 at intervals of a first interval. If the eye protection mode of the laser projection apparatus is the standard mode, the step 502 is executed at every second interval.

Wherein the first interval is greater than the second interval, and the first interval and the second interval may both be pre-stored time intervals in the laser projection apparatus. Since the first interval is greater than the second interval, in the child mode, the data amount processed by the laser projection device is smaller than the data amount processed in the standard mode, so that the laser projection device has a faster response speed in the child mode and a faster speed for turning off the projection picture.

It should be noted that the order of the steps of the control method for the laser projection apparatus provided in the embodiment of the present disclosure may be appropriately adjusted, and the steps may also be deleted according to the situation. For example, steps 502 to 506 may be deleted as appropriate, or steps 502 to 506 may be executed after step 51, or

steps

505 and 506 may be executed simultaneously, or

steps

504 and 506 may be executed simultaneously. Any method that can be easily conceived by those skilled in the art within the technical scope of the present disclosure is covered by the protection scope of the present disclosure, and thus, the detailed description thereof is omitted.

Referring to fig. 8, the laser projection apparatus may further include a laser light source 30, a main board 40, a display panel 50, a light valve 60, and a projection lens 70. The laser light source 30 is used to emit a laser beam. Alternatively, the laser light source 30 may include at least one of an infrared light source, a blue light source, and a green light source. The main board 40 is used for receiving the projection picture sent by the front-end device and transmitting the projection picture to the display panel 50. The display panel 50 is configured to generate a light valve control signal according to a pixel value of a pixel in the projection image, and control the light valve 60 to turn according to the light valve control signal. The inverted light valve 60 is used for transmitting the light beam irradiated to the surface by the laser light source 30 to the projection lens 70. The projection lens 70 is used for projecting the light beam transmitted by the light valve 60 to the display screen 20, so as to implement projection display of a projection picture on the display screen 20.

In the disclosed embodiment, the detection device 10 is used for emitting a detection signal and receiving a detection signal of a target object in front of or at the side of the laser projection apparatus. The detection means 10 are further arranged to determine the position of the target object and the heart rate of the target object from the detection signal. Referring to fig. 8, if the sensing device 10 is connected to the display panel 50, the sensing device 10 may transmit the position and the heart rate of the target object to the display panel 50. Alternatively, the detecting device 10 may transmit the received detection signal to the display panel 50. The display panel 50 can determine the position and heart rate of the target object based on the detection signal.

Therefore, the above steps 201 to 204 may all be performed by the display panel 50, or the above step 201 may be performed by the detection device 10 and the above steps 202 to 204 may be performed by the display panel 50. The above steps 301 to 307 may be performed by the display panel 50, or the above step 301 may be performed by the detection device 10, and the above steps 302 to 307 may be performed by the display panel 50. The above steps 501 to 511 are all performed by the display panel 50, or the above step 501 is performed by the inspection device 10, and the above steps 502 to 510 are performed by the display panel 50.

If the detection device 10 is connected to the main board 40, the detection device 10 may transmit the determined position of the target object to the main board 40. Alternatively, the detection device 10 may transmit the received detection signal to the main board 40. The main board 40 can determine the position and heart rate of the target object according to the detection signal.

Therefore, the steps 201 to 204 may be performed by the motherboard 40, or the step 201 may be performed by the detection device 10, and the steps 202 to 204 may be performed by the motherboard 40. The steps 301 to 307 may be executed by the motherboard 40, or the step 301 may be executed by the detection device 10, and the steps 302 to 307 may be executed by the motherboard 40. The steps 501 to 511 are all performed by the motherboard 40, or the step 501 may be performed by the detection device 10, and the steps 502 to 510 may be performed by the motherboard 40. The embodiment of the present disclosure is described taking as an example that the inspection device 10 is connected to the display panel 50.

Embodiments of the present disclosure provide a laser projection device, which may be as shown in fig. 1 and 8, the laser projection device configured to:

and receiving a detection signal of a target object in front of or at the side of the laser projection equipment in the process of projecting the image beam by the laser projection equipment. Determining the type of the target object according to the detection signal, wherein the type of the target object comprises children and adults. A target eye protection pattern is determined based on the type of the target object. And if the current eye protection mode of the laser projection equipment is different from the target eye protection mode, switching the eye protection mode of the laser projection equipment into the target eye protection mode.

To sum up, the embodiment of the present disclosure provides a laser projection device, where the laser projection device may switch a current eye protection mode of the laser projection device to a target eye protection mode when it is determined that the current eye protection mode is different from a target eye protection mode corresponding to a type of the target object. Therefore, the eye protection mode of the laser projection equipment is dynamically adjusted according to the type of the target object, the flexibility of switching the eye protection mode is improved, and the reliability of eye protection is improved.

Optionally, the detection signal is used to characterize the heart rate of the target subject. The laser projection equipment is used for determining that the type of the target object is a child if the heart rate of the target object is within the first heart rate range. And if the heart rate of the target object is within the second heart rate range, determining that the type of the target object is an adult.

Wherein the upper limit value of the first heart rate range is greater than or equal to the lower limit value of the second heart rate range.

Optionally, the detection signal is used to represent the position of the target object, and the laser projection device is used to determine that the type of the target object is a child if it is determined according to the detection signal that the change frequency of the position of the target object within the target duration is greater than the frequency threshold. And if the change frequency of the position of the target object in the target time length is determined to be less than or equal to the frequency threshold according to the detection signal, determining that the type of the target object is an adult.

Optionally, if the number of the target objects is one, the laser projection apparatus is configured to determine that the target eye protection mode is the child mode if the type of the target object is a child. And if the type of the target object is an adult, determining that the target eye protection mode is a standard mode.

Optionally, if the number of the target objects is multiple, the laser projection apparatus is configured to determine that the target eye protection mode is the child mode if the type of any one of the multiple target objects is a child. And if the types of each target object in the plurality of target objects are adults, determining that the target eye protection mode is a standard mode.

Optionally, the eye protection mode of the laser projection device comprises a child mode and a standard mode. The laser projection equipment is further used for setting the human eye protection mode of the laser projection equipment to be the child mode if the parameter value of the characteristic parameter is detected to be the first target value. And if the parameter value of the characteristic parameter is detected to be the second target value, setting the eye protection mode of the laser projection equipment as a standard mode.

Optionally, the detection signal is used to represent the position of the target object, and the laser projection apparatus is further used to detect whether the position of the target object is within the protection range of human eyes. And if the position of the target object is within the eye protection range and the eye protection mode of the laser projection equipment is the child mode, closing the projection picture. And if the position of the target object is within the human eye protection range and the human eye protection mode of the laser projection equipment is the standard mode, changing the display of the projection picture.

Optionally, the human eye protection range comprises a plurality of threshold detection ranges. The laser projection equipment is used for closing the projection picture if the position of the target object is within the target threshold detection range. And if the position of the target object is in other threshold detection ranges except the target threshold detection range, displaying a prompt picture on the projection picture, and/or adjusting the brightness of the projection picture.

The prompting picture changes according to the change of the detection signal of the target object, and the distance upper limit of the target threshold detection range is smaller than the distance lower limits of other threshold detection ranges.

Referring to fig. 8, the laser projection apparatus may further include a light source driving circuit 80, and the light source driving circuit 80 is connected to the laser light source 30 and the display panel 50, respectively.

The display panel 50 may store a correspondence relationship between the luminance and the current control signal in advance. The display panel 50 may determine the target current control signal corresponding to the luminance corresponding to the threshold detection range in which the first target position is located from the correspondence relationship between the luminance and the current control signal after determining the luminance corresponding to the threshold detection range in which the first target position is located in the process of changing the luminance of the projection screen. Thereafter, the display panel 50 may transmit the target current control signal to the light source driving circuit 80, and the light source driving circuit 80 may transmit the target driving current to the laser light source 30 in response to the target current control signal. The laser light source 30 emits a laser beam driven by the target drive current.

In the correspondence relationship between the brightness and the current control signal, the duty ratio of the current control signal is positively correlated with the brightness, that is, the lower the brightness is, the smaller the duty ratio of the current control signal is, the smaller the driving current sent by the corresponding light source driving circuit 80 to the laser light source 30 is; the higher the brightness, the larger the duty cycle of the current control signal, and the larger the drive current sent by the corresponding light source drive circuit 80 to the laser light source 30.

Optionally, the laser projection device is further configured to detect whether the position of the target object is within a human eye protection range every first interval if the human eye protection mode of the laser projection device is a child mode. And if the eye protection mode of the laser projection equipment is the standard mode, detecting whether the position of the target object is positioned in the eye protection range at intervals of a second interval. Wherein the first interval is greater than the second interval.

Referring to fig. 8, the laser projection apparatus may further include an audio driving circuit 90 and an audio player 91. The laser projection device is further configured to control the audio driving circuit 90 to drive the audio player 91 to play audio, the audio is used for prompting the position of the target object, and the audio can be changed along with the position change of the target object.

Referring to fig. 9, the detection device 10 may include a power supply driving circuit 101, a signal generation circuit 102, a signal transmitter 103, a signal mixing circuit 104, a signal receiver 105, a filter 106, a digital-to-analog converter 107, a data processing circuit 108, and a controller 109.

The power driving circuit 101 is connected to the signal generating circuit 102, and the power driving circuit 101 is configured to transmit a driving signal to the signal generating circuit 102.

The signal generating circuit 102 is also connected to the signal mixing circuit 104 and the signal transmitter 103, respectively, and the signal generating circuit 102 is configured to generate a detection signal under the driving of the driving signal transmitted by the power driving circuit 101, and transmit the generated detection signal to the signal transmitter 103 and the signal mixing circuit 104, respectively.

The signal transmitter 103 is used for transmitting a detection signal. The signal receiver 105 is connected to the signal mixing circuit 104, and the signal receiver 105 is configured to receive a detection signal of the target object 001 and transmit the received detection signal to the signal mixing circuit 104.

The signal mixing circuit 104 is further connected to the filter 106, and the signal mixing circuit 104 is configured to determine a difference signal according to the received detection signal transmitted by the signal generating circuit 102 and the received detection signal transmitted by the signal receiver 105, and transmit the difference signal to the filter 106.

The filter 106 is further connected to the digital-to-analog converter 107, and the filter 106 is configured to perform filtering processing on the difference signal and transmit the filtered difference signal to the digital-to-analog converter 107.

The digital-to-analog converter 107 is further connected to the data processing circuit 108, and the digital-to-analog converter 107 is configured to convert the filtered difference signal into an analog signal and transmit the analog signal to the data processing circuit 108.

The data processing circuit 108 is further connected to the controller 109, and the data processing circuit 108 is configured to determine a peak frequency of the analog signal and a difference between phase angles of two adjacent analog signals, respectively, and transmit the peak frequency of the analog signal and the difference between the phase angles of two adjacent analog signals to the controller 109.

The controller 109 is also connected to the main control circuit 501, and the controller 109 is configured to determine a target distance d between the target object 001 and the detection device 10 according to the peak frequency of the analog signal. And determining the azimuth angle beta of the target object 001 according to the difference value of the phase angles. The target distance d and the azimuth angle β are then transmitted to the main control circuit 501 included in the display panel 50.

Optionally, the controller 109 is further connected to the power driving circuit 101, and the controller 109 is configured to transmit a driving command to the power driving circuit 101. The power supply drive circuit 101 is configured to transmit a drive signal to the signal generation circuit 102 in response to a drive instruction.

If the detection device 10 is a millimeter wave sensor, the detection signal may be a millimeter wave signal. Referring to fig. 10 and 11, the millimeter wave signal may be a high frequency continuous wave whose amplitude a varies sinusoidally with time t. And the frequency f varies linearly with time t. The detection signal received by the signal mixing circuit 104 and transmitted by the signal generating circuit 102 is the detection signal transmitted by the signal transmitter 103.

Referring to fig. 12 and 13, since the signal generating circuit 102 transmits the detection signal 0031 to the signal mixing circuit 104 with a certain time interval Ta until the signal receiver 105 receives the detection signal 0032, the signal mixing circuit 104 can determine the difference signal IF according to the detection signal 0031 transmitted by the signal generating circuit 102 and the detection signal 0032 transmitted by the signal receiver 105.

In the embodiment of the present disclosure, the controller 109 may store a correspondence relationship between the frequency and the distance in advance, and after determining the peak frequency, the controller 109 may determine the target distance d corresponding to the peak frequency of the analog signal from the correspondence relationship between the frequency and the distance.

Wherein, in the corresponding relationship between the frequency and the distance, the distance

V is the transmission speed of the millimeter wave signal, F is the frequency in the frequency-distance correspondence, and referring to fig. 11, Tc is the time period for the millimeter wave signal 002 emitted by the signal emitter 103 to increase from the initial frequency F0 to the maximum frequency F1. B is the bandwidth of the millimeter wave signal 002 emitted by the signal emitter 103. For example, the initial frequency f0 may be 77 gigahertz (GHz), the bandwidth B may be 4GHz, the duration Tc may be 40 microseconds (μ s), and the maximum frequency f1 may be 81 GHz.

Alternatively, the controller 109 may store in advance calculation formulas of the transmission speed V, the duration Tc, the bandwidth B, and the above-described distance d. After determining the peak frequency F, the controller 109 may determine the target distance d corresponding to the peak frequency of the analog signal according to the above calculation formula of the distance d, and the duration Tc and the bandwidth B stored in advance.

Optionally, the controller 109 may also store a corresponding relationship between the difference of the phase angles and the azimuth angle in advance. After determining the difference between the phase angles of two adjacent analog signals, the controller 109 may determine the azimuth angle corresponding to the difference between the phase angles of two adjacent analog signals from the corresponding relationship between the difference between the phase angles and the azimuth angle.

In the correspondence relationship between the difference value of the phase angles and the azimuth angle, the azimuth angle β satisfies:

wherein Δ Φ is a difference between phase angles of two adjacent analog signals, and L is a separation distance between two adjacent receiving antennas.

Alternatively, the controller 109 stores in advance calculation formulas of the initial frequency f0, the transmission speed V, the spacing distance L, and the above-described azimuth angle β. After receiving the difference between the phase angles of two adjacent analog signals, the controller 109 may determine the azimuth angle corresponding to the difference between the phase angles according to the above calculation formula of the azimuth angle β, and the pre-stored initial frequency f0, transmission speed V and separation distance L.

The signal receiver 105 may include a plurality of receive antennas (only three receive antennas, a first receive antenna 1051, a second receive antenna 1052, and a third receive antenna 1053, respectively, are shown in fig. 9). Each of the receiving antennas is configured to receive a detection signal reflected by the target object 001 and transmit the received detection signal to the signal mixing circuit 104. The signal mixing circuit 104 may determine a difference signal IF corresponding to each receiving antenna based on the received detection signal transmitted by the signal generation circuit 102 and the received detection signal transmitted by each receiving antenna, thereby obtaining a plurality of difference signals IF. The at least one difference signal IF is then transmitted to the filter 106.

The filter 106 may filter the plurality of difference signals and transmit the filtered plurality of difference signals to the digital-to-analog converter 107. The digital-to-analog converter 107 may convert the filtered plurality of difference signals IF into analog signals, obtain a plurality of analog signals, and transmit the plurality of analog signals to the data processing circuit 108.

The data processing circuit 108 may determine a peak frequency of each of the plurality of analog signals and send the peak frequency of each analog signal to the controller 109. The controller 109 may determine a plurality of initial distances according to the plurality of peak frequencies, and use the average of the plurality of initial distances as the target distance d between the target object 001 and the detection device 10.

The data processing circuit 108 may also determine a difference value of phase angles of analog signals corresponding to any two adjacent receiving antennas in the plurality of receiving antennas, so as to obtain a plurality of difference values, and send the plurality of difference values to the controller 109. The controller 109 may determine an azimuth angle according to each difference, obtain a plurality of initial azimuth angles, and then determine a mean value of the plurality of initial azimuth angles as the azimuth angle β of the target object. The controller 109 may then also transmit the target distance d and the azimuth angle β of the target object to the main control circuit 501. The master control circuit 501 may perform the above-described method embodiments.

In the disclosed embodiments, according to the fourier transform theory: the observation window can detect frequency components spaced more than 1/T apart, i.e.

It can be determined by the above calculation formula of the target distance d,

it can be seen that the range resolution of the detection device, which refers to the amount of change in the distance over which the detection device can detect the movement of the target object, is related to the bandwidth of the detection signal emitted by the detection device. Because the distance resolution of the detection device is related to the bandwidth of the detection signal emitted by the detection device, the detection device with the bandwidth of the emitted detection signal being GHz can detect the centimeter-level or even millimeter-level change distance. By using the detection device of this accuracy, even if the distance change of the target object is small, the detection device can detect the changing distance of the target object, and can distinguish whether the target object is stationary or changing.

For example, assuming that the bandwidth of the detection signal emitted by the detection device is 77GHz, the distance resolution of the detection device can reach 1.94mm, that is, in the case that the target object moves by 1.94mm, the detection device can also detect the distance moved by the target object.

In the related art, a laser projection apparatus may include a pyroelectric sensor and a control circuit. When a human body in the sensing range of the pyroelectric sensor moves, the pyroelectric sensor can detect infrared signals radiated by the human body and amplify the received infrared signals. And then converting the amplified infrared signal into an electric signal and sending the electric signal to a control circuit. When the control circuit determines that the electric signal is larger than the signal threshold, the brightness of the projection screen can be reduced, and therefore damage to human eyes caused by laser emitted by the laser projection equipment is reduced. However, the pyroelectric sensor can only detect infrared signals radiated by a human body when the human body moves, so that the reliability of human body detection is low, and the safety of human eye protection is low.

In the embodiment of the disclosure, the laser projection device may determine the position of the target object according to the detection signal reflected by the target object, and adjust the brightness of the projection image according to the threshold detection range where the position is located, thereby improving the flexibility of eye protection.

Table 2 shows the performance parameters and usage requirements of the pyroelectric sensor and the detection device. As can be seen from table 2, the performance of the detection device is superior to that of the pyroelectric sensor. For example, as shown in table 2, the activation time period of the pyroelectric sensor is 14s, and the activation time period of the detection device is 1 s. It can be seen that the activation time period of the detection device is shorter than the activation time period of the pyroelectric sensor. And the pyroelectric sensor cannot detect a stationary person, and the detection device can detect a stationary person.

TABLE 2

Referring to fig. 9, the display panel 50 may include a main control circuit 501, a display driving circuit 502, and a first memory 503. The light source driving circuit 80 is connected to the main control circuit 501 and the display driving circuit 502, respectively. The first memory 503 is connected to the display driving circuit 502, and the first memory 503 is used for storing the primary color gradation values of the pixels in the projection picture. The display driving circuit 502 is further configured to obtain the stored primary color level values of the pixels in the projection image from the first memory 503, and control the light valve to turn over according to the primary color level values of the pixels in the projection image, so as to project and display the projection image on the display screen.

It is assumed that the laser light source 30 includes a red laser, a green laser, a blue laser, and a yellow laser. The display driving circuit 502 may output a red PWM signal R _ PWM corresponding to a red laser based on a red primary color component of a projection screen, a green PWM signal G _ PWM corresponding to a green laser based on a green primary color component of the projection screen, a blue PWM signal B _ PWM corresponding to a blue laser based on a blue primary color component of the projection screen, and a yellow PWM signal Y _ PWM corresponding to a yellow laser based on a yellow primary color component of the projection screen. The display driving circuit 502 may output the enable signal R _ EN corresponding to the red laser through the main control circuit 501 based on the lighting time of the red laser in the driving period. Based on the lighting time period of the green laser in the driving period, the enable signal G _ EN corresponding to the green laser is output through the main control circuit 501. Based on the lighting time period of the blue laser in the drive period, the enable signal B _ EN corresponding to the blue laser is output through the main control circuit 501. Based on the lighting time period of the yellow laser in the driving period, the enable signal Y _ EN corresponding to the yellow laser is output through the main control circuit 501.

Referring to fig. 9, the main board 40 may include a slave component 401, a second memory 402, and a power amplifier component 403. The laser projection device may also include a speaker 92. The slave control module 401 is connected to a power amplifier module 403 and a second memory 402, respectively, and the power amplifier module 403 is further connected to the speaker 92. The second memory 402 is used for storing a projection picture to be projected and displayed. The slave control module 401 is configured to obtain a projection picture from the second memory 403 and transmit the projection picture to the display driving circuit 502. The power amplifier module 403 is used for amplifying the audio signal sent from the control module 401 and driving the speaker 92 to play audio.

The disclosed embodiment provides a laser projection apparatus, including: a memory, a processor and a computer program stored on the memory, the processor implementing the above-described method embodiments (e.g. the embodiments shown in fig. 2, fig. 3, fig. 5 or fig. 6) when executing the computer program.

The disclosed embodiments provide a computer-readable storage medium having stored therein instructions that are loaded and executed by a processor to implement the above-described method embodiments (e.g., the embodiments shown in fig. 2, 3, 5, or 6).

Embodiments of the present disclosure provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform the above-described method embodiments (e.g., the embodiments shown in fig. 2, 3, 5 or 6).

In the disclosed embodiments, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "and/or" in the embodiments of the present disclosure is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. The term "plurality" in the embodiments of the present disclosure means two or more.

The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims

1. A method of controlling a laser projection apparatus, the method comprising:

2. The method of claim 1, wherein the detection signal is used to characterize a heart rate of the target subject; the determining the type of the target object according to the detection signal comprises:

3. The method of claim 1, wherein the detection signal is used to characterize a location of the target object, and wherein determining the type of the target object based on the detection signal comprises:

4. The method according to any one of claims 1 to 3, wherein if the number of the target objects is one, the determining the target eye protection mode based on the type of the target object comprises:

5. The method according to any one of claims 1 to 3, wherein if the number of the target objects is plural, the determining the target eye protection mode based on the type of the target object comprises:

6. The method of any of claims 1 to 3, wherein the eye protection mode of the laser projection device comprises a child mode and a standard mode; the method further comprises the following steps:

7. The method of any one of claims 1 to 3, wherein the detection signal is used to characterize the position of the target object, the method further comprising:

8. The method of claim 7, wherein the human eye protection range comprises a plurality of threshold detection ranges; the changing the display of the projection screen includes:

9. The method of claim 7, wherein the detecting whether the target object is located within a human eye protection range comprises:

wherein the first interval is greater than the second interval.

10. A laser projection device, wherein the laser projection device is configured to: