WO2023179683A1

WO2023179683A1 - Laser projection device and control method therefor

Info

Publication number: WO2023179683A1
Application number: PCT/CN2023/083129
Authority: WO
Inventors: 陈许; 薛兴鹤
Original assignee: 青岛海信激光显示股份有限公司
Priority date: 2022-03-22
Filing date: 2023-03-22
Publication date: 2023-09-28

Abstract

The present application discloses a laser projection device and a control method therefor, in the technical field of electronics. When the laser projection device determines that a position of a target object has changed, the device, according to a change parameter of the position of the target object, changes a display effect of a projection picture projected by the laser projection device onto a projection screen, and/or changes an audio playing effect of the laser projection device. Because display of the projection picture and/or the audio playing effect can be flexibly changed according to the position of the target object, functions of the laser projection device are enriched.

Description

Laser projection equipment and control method thereof

This application claims the priority of the Chinese patent application with application number 202210289234.7 and the invention title "Laser Projection Equipment and Control Method" submitted on March 22, 2022, as well as the application number submitted on March 22, 2022 It is the priority of the Chinese patent application 202210289253.

Technical field

The present disclosure relates to the field of electronic technology, and in particular to a laser projection device and a control method thereof.

Background technique

At present, after the laser emitted by the laser projection equipment is projected onto the projection screen, the projected image can be projected onto the projection screen. However, the functions of current laser projection equipment are relatively single.

Contents of the invention

Embodiments of the present disclosure provide a laser projection device and a control method thereof, which can solve the problem in related technologies that the function of the laser projection device is relatively single. The technical solutions are as follows:

On the one hand, a method for controlling a laser projection device is provided, and the method includes:

Emit detection signals;

Receive the first reflection signal reflected by the target at the first time and the second reflection signal reflected at the second time. The first reflection signal and the second reflection signal are generated by the target object reflecting the detection signal. signal of;

If it is determined that the position of the target object changes according to the first reflection signal and the second reflection signal, then the projection projected by the laser projection device to the projection screen is changed according to the change parameter of the position of the target object. The display effect of the picture, and/or, changing the audio playback effect of the laser projection device.

On the other hand, a laser projection device is provided, and the laser projection device is used for:

Emit detection signals;

If it is determined that the position of the target object changes according to the first reflection signal and the second reflection signal, then the projection projected by the laser projection device to the projection screen is changed according to the change parameter of the position of the target object. The display effect of the picture, and/or changing the playback effect of the audio played by the laser projection device.

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

The beneficial effects brought by the technical solutions provided by the embodiments of the present disclosure include at least:

Embodiments of the present disclosure provide a laser projection device and a control method thereof. If the laser projection device determines that the position of the target object has changed, the projection image projected by the laser projection device to the projection screen will be changed according to the changing parameters of the position of the target object. display effect, and/or change the audio playback effect of the laser projection device. Since the display of the projected image and/or the playback effect of the audio can be flexibly changed according to the position of the target object, the functions of the laser projection equipment are enriched.

Description of the 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 will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of a laser projection device provided by an embodiment of the present disclosure;

Figure 2 is a schematic structural diagram of another laser projection device provided by an embodiment of the present disclosure;

Figure 3 is a flow chart of a control method for a laser projection device provided by an embodiment of the present disclosure;

Figure 4 is a flow chart of another control method of a laser projection device provided by an embodiment of the present disclosure;

Figure 5 is a schematic structural diagram of yet another laser projection device provided by an embodiment of the present disclosure;

Figure 6 is a schematic diagram of the detection angle of a detection device on a first plane provided by an embodiment of the present disclosure;

Figure 7 is a schematic diagram of the detection angle of a detection device on the second plane provided by an embodiment of the present disclosure;

Figure 8 is a schematic diagram of the position of a target provided by an embodiment of the present disclosure;

Figure 9 is a schematic diagram of distance and brightness provided by an embodiment of the present disclosure;

Figure 10 is a schematic diagram of distance and contrast provided by an embodiment of the present disclosure;

Figure 11 is a schematic diagram of distance and color saturation provided by an embodiment of the present disclosure;

Figure 12 is a schematic diagram of distance and display ratio provided by an embodiment of the present disclosure;

Figure 13 is a schematic diagram of distance and audio coverage provided by an embodiment of the present disclosure;

Figure 14 is a flow chart of yet another control method for a laser projection device provided by an embodiment of the present disclosure;

Figure 15 is a schematic diagram of a first display area and a second display area provided by an embodiment of the present disclosure;

Figure 16 is a schematic diagram showing a video screen and an interactive screen provided by an embodiment of the present disclosure;

Figure 17 is a schematic diagram of changing the display position of an interactive screen provided by an embodiment of the present disclosure;

Figure 18 is a flow chart of yet another control method for a laser projection device provided by an embodiment of the present disclosure;

Figure 19 is a schematic diagram of a projection screen including three display areas provided by an embodiment of the present disclosure;

Figure 20 is another schematic diagram of changing the display position of the interactive screen provided by an embodiment of the present disclosure;

Figure 21 is a schematic diagram of another method of changing the display position of an interactive screen provided by an embodiment of the present disclosure;

Figure 22 is another schematic diagram of changing the display position of the interactive screen provided by an embodiment of the present disclosure;

Figure 23 is another schematic diagram of changing the display position of the interactive screen provided by an embodiment of the present disclosure;

Figure 24 is a schematic structural diagram of another laser projection device provided by an embodiment of the present disclosure;

Figure 25 is a schematic diagram of a detection signal emitted by a signal transmitter provided by an embodiment of the present disclosure;

Figure 26 is a schematic diagram of a detection signal emitted by another signal transmitter provided by an embodiment of the present disclosure;

Figure 27 is a schematic diagram of a detection signal emitted by a signal transmitter and a detection signal reflected by a target object received by a signal receiver according to an embodiment of the present disclosure;

Figure 28 is a schematic diagram of an angle of arrival provided by an embodiment of the present disclosure;

Figure 29 is a schematic structural diagram of a detection device provided by an embodiment of the present disclosure.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the embodiments of the present disclosure will be described in further detail below in conjunction with the accompanying drawings.

FIG. 1 is a schematic structural diagram of a laser projection device provided by an embodiment of the present disclosure. Referring to FIG. 1 , the projection device includes a housing 01 and a projection imaging system wrapped by the housing 01 . As shown in FIG. 1 , the projection imaging system may include a light source part 021 , an optical-mechanical part 022 , and a lens part 023 .

The light source unit 021 is provided with a light source, which may be a laser light source, for example. The opto-mechanical part 022 can modulate the light beam emitted by the light source to obtain a projection image to be projected and displayed. The projection image to be projected and displayed can be projected to the projection screen through the projection lens in the lens part 023 to realize the display of the projection image.

FIG. 2 is a schematic structural diagram of another laser projection device provided by an embodiment of the present disclosure. Referring to FIG. 2 , the laser projection device may include: a mainboard 40 , a display panel 50 and a power board 00 . The power board 00 is connected to the main board 40 and the display board 50 respectively, and is used to power various devices or some modules on the main board 40 and the display board 50 , and is used to power other functional modules in the laser projection equipment, such as human eye protection modules. , fans and wireless-fidelity (WI-FI) modules. The power board 00 may also be provided with a laser driving component for driving the laser light source to emit light. Alternatively, the laser driving assembly can also be provided independently of the power board 00 .

The mainboard 40 is also connected to the display board 50. The mainboard 40 is used to receive the image data of the projection screen sent by the front-end device and decode the image data. Among them, as shown in Figure 2, the motherboard 40 can be provided with a system on chip (SoC) 41. The SoC 41 is capable of decoding image data in different data formats into a normalized format and transmitting the normalized format image data to the display panel 50 . For example, the mainboard 40 may transmit normalized format image data to the display panel 50 through a connector.

The mainboard 40 may also be called a television (television, TV) board.

As shown in Figure 2, the display panel 50 can be provided with an algorithm processing module field programmable gate array (FPGA) 51 and a display control chip 52. The algorithm processing module FPGA 51 can process the image data of the input projection screen, such as motion estimation and motion compensation (motion estimation and motion compensation, MEMC) frequency doubling processing or image correction processing. The display control chip 52 can be connected to the algorithm processing module FPGA 51, and is used to receive the processed image data of the projection screen, and use the processed projection screen as the projection screen to be displayed.

In one implementation, the display panel 50 may not include the algorithm processing module FPGA 51. The display control chip 52 can be directly connected to the motherboard 40 , and the display control chip 52 can directly receive the image data of the projection screen transmitted by the motherboard 40 .

In the embodiment of the present disclosure, the display control chip 52 may include a (digital light processing, DLP) chip and a driver chip for driving the light source to emit light (not output in Figure 2). The DLP chip can output a driving signal to the light source to control the light source to emit light. Wherein, the driving signal may include an image enable signal and a brightness adjustment signal. The image enable signal may also be called a primary color light enable signal. The primary color light enable signal can be expressed as X_EN, where X is the abbreviation of different primary color lights. The primary color light enable signal is used to control whether the light source emits light (that is, whether to light up), so as to control the lighting timing of multiple light sources of different colors. The brightness adjustment signal may be a pulse width modulation (pulse width modulation, PWM) signal, which is used to control the luminous brightness of the light source.

In one embodiment, the display panel 50 may further include a light modulation device (not shown in FIG. 2). Wherein, the light modulation device can be a digital micromirror device (DMD), and the digital micromirror device can also be called a light valve. The display control chip 52 can generate a modulation drive signal for driving the light modulation device based on the projection image to be projected and display, and generate a drive signal for driving the light source to emit light. Based on this, the light modulation device can modulate the light beam emitted by the light source under the control of the modulation drive signal to obtain the image light beam of the projection screen. The image beam can be projected to the projection screen through the projection lens to display the projection image.

Figure 3 is a flow chart of a control method of a laser projection device provided by an embodiment of the present disclosure. This method can be applied to a laser projection device, for example, can be applied to the laser projection device shown in Figure 1 or Figure 2. The laser projection device The equipment can be a laser projection TV. As shown in Figure 3, the method may include:

Step 101. Transmit a detection signal.

In the embodiment of the present disclosure, after the laser projection device is powered on, the laser projection device may periodically emit detection signals. Optionally, the laser projection device can emit a detection signal during the process of projecting the projection image and playing the audio.

The laser projection device may include a host and a detection device. The host is used to project projection images onto the projection screen and play audio. The detection device is used to emit detection signals. Wherein, the detection device may be located on a side of the housing of the host, where the side intersects with the projection screen. Alternatively, the detection device is located on a side of the housing away from the projection screen. For example, the detection device may be a millimeter wave sensor, and correspondingly, the detection signal may be a millimeter wave signal.

Step 102: Receive a first reflection signal reflected by the target at a first time and a second reflection signal reflected at a second time.

After the laser projection device emits the detection signal, it may receive a first reflection signal reflected at a first time by a target located in front or to the side of the laser projection device, and a second reflection signal reflected at a second time. Wherein, the target object may be a person located within the detection range of the detection device, the first reflected signal and the second reflected signal are signals generated by the target object reflecting the detection signal, and the second time is located after the first time.

Step 103. If it is determined that the position of the target object changes based on the first reflection signal and the second reflection signal, then change the display effect of the projection screen projected by the laser projection device to the projection screen according to the change parameter of the target object's position, and/ Or, change the audio playback effect of the laser projection device.

After receiving the first reflection signal reflected by the target object at the first moment, the laser projection device can determine the position of the target object at the first moment based on the first reflection signal. After receiving the second reflection signal reflected by the target object at the second moment, the laser projection device can determine the position of the target object at the second moment based on the second reflection signal.

If the laser projection device determines that the position of the target object has changed based on the first reflection signal and the second reflection signal, it can change the display effect of the projection screen projected by the laser projection device to the projection screen according to the changing parameter of the target object's position, and /Or, change the audio playback effect of the laser projection device. Wherein, the change parameter may include a detection range in which the position of the target object is located, and/or an azimuth angle of the target object relative to the laser projection device. If the laser projection equipment determines that the position of the target object has not changed based on the first reflection signal and the second reflection signal, there is no need to change the display effect of the projection screen, and there is no need to change the audio playback effect.

To sum up, embodiments of the present disclosure provide a control method for a laser projection device. If the laser projection device determines that the position of the target object changes, the laser projection device changes the projection direction according to the changing parameters of the target object's position. The display effect of the screen's projection picture, and/or, changing the audio playback effect of the laser projection device. Since the display of the projected image and/or the playback effect of the audio can be flexibly changed according to the position of the target object, the functions of the laser projection equipment are enriched.

In this embodiment of the present application, the projection images projected by the laser projection device onto the projection screen may include: at least one of a video image and an interactive image. Wherein, the interactive picture is a picture obtained by the interaction between the target object and the laser projection device.

As a first possible implementation manner, the projection picture may include at least: a video picture. In this implementation, referring to Figure 4, the control method of the laser projection device may include:

Step 201: Detect whether the human-computer interaction function of the laser projection device is turned on.

In an embodiment of the present disclosure, the laser projection device can detect whether its human-computer interaction function is turned on in response to the detection instruction. For example, the detection command may be a power-on command. If the laser projection device detects that its human-computer interaction function is not turned on, step 202 can be performed. If the laser projection device detects that its human-computer interaction function has been turned on, step 203 can be performed.

In one implementation, the laser projection device can detect whether the parameter value of the characteristic parameter is a target value. If the laser projection equipment detects that the parameter value of the characteristic parameter is the target value, it can determine that its human-computer interaction function has been turned on. If the laser projection equipment detects that the parameter value of the characteristic parameter is not the target value, it can determine that its human-computer interaction function is not turned on. Among them, the characteristic parameter is used to indicate whether the human-computer interaction function of the laser projection equipment is turned on, the target value is used to indicate that the human-computer interaction function of the laser projection equipment is turned on, and the target value is a value prestored in the laser projection equipment .

The human-computer interaction function may be a function that is automatically turned on when the laser projection device is powered on and based on its internal sensor detecting the presence of a target (such as a user) in front of the laser projection device. After the human-computer interaction function is turned on, the laser projection device can project interactive images to the projection screen.

Step 202: Display prompt information on the projection screen.

If the laser projection equipment detects that its human-computer interaction function is not turned on, it can display prompt information on the projection screen. Among them, the prompt information is used to prompt to turn on the human-computer interaction function. For example, the prompt information may be "Please turn on the human-computer interaction function."

In an embodiment of the present disclosure, after detecting the power-on command, if the laser projection device determines that its human-computer interaction function is not turned on, the prompt information can be superimposed on the video screen displayed on the projection screen after the power-on is completed. Laser projection equipment If the equipment receives a confirmation instruction for the prompt information, it can respond to the confirmation instruction and set the parameter value of the characteristic parameter to the target value to enable the human-computer interaction function of the laser projection device, thereby enabling the projection screen to be projected And during the process of playing audio, a detection signal is emitted. If the laser projection device receives the prohibition instruction for this prompt message, it does not need to modify the parameter value of the characteristic parameter.

Referring to FIG. 5 , the laser projection device may include a host 10 , which is used to project the projection image onto the projection screen 20 and to play audio.

Step 203: Transmit a detection signal.

If the laser projection equipment determines that its human-computer interaction function is turned on, it can periodically emit detection signals during the process of projecting the projection screen and playing audio. Referring to FIG. 5 , the laser projection device may further include a detection device 30 . The detection device 30 is used to periodically transmit detection signals.

The detection device 30 may be located on a side of the housing of the host 10 , and the side intersects with the projection screen 20 . Or, referring to FIG. 5 , the detection device 30 is located on the side of the housing away from the projection screen 20 . For example, the detection device 30 can be a millimeter wave sensor, and accordingly, the detection signal can be a millimeter wave signal.

Referring to Figures 6 and 7, the detection angle θ1 of the detection device 30 in the first plane is greater than or equal to -60 degrees and less than or equal to 60 degrees, and the detection angle θ2 in the second plane is greater than or equal to -60 degrees, and less than or equal to 60 degrees. Wherein, the first plane is perpendicular to the second plane. In one implementation, the first plane may be parallel to the bearing surface of the laser projection device, and the bearing surface may be parallel to the horizontal plane.

Step 204: Receive the first reflection signal reflected by the target at the first time and the second reflection signal reflected at the second time.

After the laser projection device emits the detection signal, it may receive a first reflection signal reflected at a first time by a target located in front or to the side of the laser projection device, and a second reflection signal reflected at a second time. The target object may be a person located within the detection range of the detection device 30 , the first reflected signal and the second reflected signal are signals generated by the target object reflecting the detection signal, and the second time is located after the first time.

Taking the detection device 30 as a millimeter wave sensor as an example, the millimeter wave sensor includes a millimeter wave signal transmitter and a millimeter wave signal receiver. The millimeter wave signal transmitter is used to transmit millimeter wave signals, and the millimeter wave signal receiver is used to receive millimeter wave signals reflected by the target object.

Step 205: If it is determined that the position of the target object has changed based on the first reflection signal and the second reflection signal, and the position after the change and the position before the change are within different detection ranges of the laser projection equipment, change the display effect of the projection screen. , and/or, change the audio playback effect.

If the laser projection device determines that the position of the target object has changed based on the first reflection signal and the second reflection signal, and the position after the change and the position before the change are within different detection ranges of the laser projection device, the projection screen can be changed. Display effects, and/or change audio playback effects. If the laser projection device determines that the position of the target object has changed based on the first reflection signal and the second reflection signal, and the position after the change and the position before the change are within the same detection range of the laser projection device, there is no need to change the display of the projection screen. effect without changing the audio playback effect. If the laser projection equipment determines that the position of the target object has not changed based on the first reflection signal and the second reflection signal, there is no need to change the display effect of the projection screen, and there is no need to change the audio playback effect.

The process of the laser projection device determining whether the position of the target object has changed based on the first reflection signal and the second reflection signal, and whether the position after the change and the position before the change are within different detection ranges of the laser projection device may include the following steps :

A1. The laser projection device determines the position of the target object at the first moment based on the first reflection signal.

Referring to FIG. 8 , the position of the target object may refer to the position of the target object in the three-dimensional coordinate system. The origin of the three-dimensional coordinate system XYZ may be the position where the detection device 30 is located, and the three-dimensional coordinate system XYZ may include a first axis X, a second axis Y, and a third axis Z. The third axis Z is perpendicular to the bearing surface of the laser projection device, the first axis X and the second axis Y are parallel to the first plane, and the first axis X is perpendicular to the second axis Y.

After receiving the first reflection signal reflected by the target object at the first moment, the laser projection device can The signal determines the distance d between the target object and the detection device 30 at the first moment, the pitch angle ɑ of the target object, and the azimuth angle β of the target object.

Wherein, the azimuth angle β is the angle between the orthographic projection of the target connection line between the target object and the origin of the three-dimensional coordinate system XYZ in the coordinate system XY and the second axis Y. Among them, the azimuth angle β is greater than or equal to the minimum angle of the detection angle θ1 (that is, -60 degrees), and is less than or equal to the maximum angle of the detection angle θ1 (that is, 60 degrees). If the target connection line is located in the quadrant of the positive direction of the first axis X and the second axis Y, then the azimuth angle β is greater than or equal to 0. If the target connection line is located in the quadrant of the negative direction of the first axis X and the second axis Y, then the azimuth angle β is less than 0.

Then the laser projection device can determine the position of the target at the first moment based on the distance d between the target and the laser projection device, the pitch angle ɑ and the azimuth angle β. The position of the target can be based on the target's position in the three-dimensional reference coordinate system XYZ. The coordinates (x0, y0, z0) in represent x0=d×cosɑ×sinβ, y0=d×cosɑ×cosβ, and z0=d×sinɑ.

A2. The laser projection device determines the position of the target object at the second moment based on the second reflection signal.

After receiving the second reflection signal reflected by the target object at the second moment, the laser projection device can determine the distance d between the target object and the detection device 30 at the second moment and the pitch angle ɑ of the target object based on the second reflection signal. and the azimuth angle β of the target. Furthermore, the laser projection device can determine the position of the target object at the second moment based on the distance d between the target object and the laser projection device, the pitch angle ɑ, and the azimuth angle β.

A3. The laser projection equipment compares whether the position of the target object at the first moment and the position of the target object at the second moment are the same.

After determining the position of the target object at the first moment and the position of the target object at the second moment, the laser projection device may compare whether the position of the target object at the first moment and the position of the target object at the second moment are the same. If the position of the target object at the first moment is the same as the position of the target object at the second moment, the laser projection device can determine that the position of the target object has not changed, so the laser projection device does not need to change the display effect of the projection screen, and there is no need to change Audio playback effect. If the position of the target object at the first moment is different from the position of the target object at the second moment, the laser projection device may determine that the position of the target object has changed.

A4. The laser projection equipment compares the position before the change and the position after the change to see if they are within different detection ranges of the laser projection equipment.

After determining that the position of the target object has changed, the laser projection device can compare the position before the change (i.e., the position of the target object at the first moment) and the position after the change (i.e., the position of the target object at the second moment) to see whether it is within the laser projection within the different detection ranges of the device. If the position before the change and the position after the change are within different detection ranges of the laser projection device, the laser projection device can determine that the position of the target object has changed significantly, so the display effect of the projection screen can be changed, and/or the audio quality can be changed. Playback effect.

If the position before the change and the position after the change are within the same detection range of the laser projection device, the laser projection device can determine that the position of the target object has changed little. Therefore, the laser projection device does not need to change the display effect of the projection screen, and does not need to change the audio. playback effect.

In embodiments of the present disclosure, the laser projection device may include multiple detection ranges. The multiple detection ranges may include multiple distance ranges and/or multiple angle ranges. This angle range refers to the range of azimuth angles of the target object.

If the multiple detection ranges include multiple distance ranges, and the distance between the target object and the laser projection device before the change and the distance between the target object and the laser projection device after the change are within different distance ranges of the laser projection device, then the laser projection The device can determine that the position before the change and the position after the change are within different detection ranges of the laser projection device. If the distance between the target object and the laser projection device before the change and the distance between the target object and the laser projection device after the change are within the same distance range of the laser projection device, the laser projection device can determine the position before the change and the position after the change. The location is within the same detection range of the laser projection equipment.

If multiple detection ranges include multiple angle ranges, and the azimuth angle of the target object before the change and the azimuth angle of the target object after the change are within different angular ranges of the laser projection device, the laser projection device can determine the position before the change and the position after the change. The positions are within different detection ranges of the laser projection equipment. If the azimuth angle of the target object before the change and the azimuth angle of the target object after the change are within the same angular range of the laser projection device, the laser projection device can determine the position before the change and the position after the change. be placed within the same detection range of the laser projection equipment.

In an embodiment of the present disclosure, the laser projection device determines that the position of the target object has changed based on the first reflection signal and the second reflection signal, and the distance between the target object and the laser projection device after the change is the same as the distance between the target object and the laser projection device before the change. After the distance of the device is within different distance ranges. If the laser projection equipment determines that the distance between the target object and the laser projection equipment becomes shorter, it can reduce at least one of the brightness of the projection screen, the contrast of the projection screen, the color saturation of the projection screen, and the display ratio of the projection screen, as shown in This changes the display effect of the projected image. If the laser projection device determines that the distance between the target object and the laser projection device becomes longer, it can increase at least one of the brightness of the projection screen, the contrast of the projection screen, the color saturation of the projection screen, and the display ratio of the projection screen, This changes the display effect of the projected image.

When the distance between the target object and the laser projection equipment becomes shorter, the target can be effectively protected by reducing at least one of the brightness of the projected image, the contrast of the projected image, the color saturation of the projected image, and the display ratio of the projected image. object's eyes. When the distance between the target object and the laser projection device becomes longer, the target can be achieved by increasing at least one of the brightness of the projected image, the contrast of the projected image, the color saturation of the projected image, and the display ratio of the projected image. Provides better viewing effects.

In one embodiment, the laser projection device can determine the distance range between the target object and the laser projection device after the change, and based on the corresponding relationship between the distance range and the brightness, adjust the brightness of the projection screen to be consistent with the change. The brightness corresponding to the distance range between the target object and the laser projection device.

The plurality of distance ranges may include a first distance range, a second distance range, a third distance range and a fourth distance range. The upper limit of the first distance range is smaller than the lower limit of the second distance range, the upper limit of the second distance range is smaller than the lower limit of the third distance range, and the upper limit of the third distance range is smaller than the lower limit of the fourth distance range. For example, referring to Figures 9 and 10, the lower limit of the first distance range may be 0, and the upper limit may be 1 meter (m), that is, the first distance range is [0, 1m]. The lower limit of the second distance range is greater than 1m, and the upper limit can be 2m, that is, the second distance range is (1m, 2m]. The upper limit of the third distance range is greater than 2m, and the lower limit of the third distance range can be 3m, that is, the The third distance range is (2m, 3m]. The lower limit of the fourth distance range is greater than 3m.

If the laser projection device determines that the distance between the target object and the laser projection device after the change is within the first distance range, it can determine the first brightness corresponding to the first distance range from the corresponding relationship between the distance range and the brightness, and Adjust the brightness of the projected image to the first brightness. If the laser projection device determines that the changed distance between the target object and the laser projection device is within the second distance range, it can determine the second brightness corresponding to the second distance range from the correspondence between the distance range and the brightness, and The brightness of the projected image is adjusted to the second brightness.

If the laser projection device determines that the changed distance between the target object and the laser projection device is within the third distance range, it can determine the third brightness corresponding to the third distance range from the corresponding relationship between the distance range and the brightness, and The brightness of the projected image is adjusted to the third brightness. If the laser projection device determines that the changed distance between the target object and the laser projection device is within the fourth distance range, it can determine the fourth brightness corresponding to the fourth distance range from the corresponding relationship between the distance range and the brightness, and The brightness of the projected image is adjusted to the fourth brightness.

Wherein, the first brightness is greater than 0 and less than the second brightness, the second brightness is less than the third brightness, the third brightness is less than the fourth brightness, and the fourth brightness is equal to the original brightness. The original brightness may be the brightness of the projection image without adjusting the brightness of the projection image. For example, referring to FIG. 9 , the first brightness may be 60% of the original brightness, and the second brightness may be 80% of the original brightness. The third brightness may be greater than 80% of the original brightness and less than the original brightness. The fourth brightness may be 100%, that is, the fourth brightness is the original brightness.

When the distance between the target object and the laser projection equipment becomes shorter, by reducing the brightness of the projected image, the eyes of the target object are effectively protected. When the distance between the target object and the laser projection equipment becomes longer, by increasing the brightness of the projection image, the displayed projection image will be clearer and the viewing effect will be better.

In the embodiment of the present disclosure, when the laser projection device changes the brightness of the projection image, the brightness of the light beam emitted by the light source can be changed by changing the driving current of the light source of the laser projection device, thereby changing the brightness of the projection image. Alternatively, the laser projection device can change the brightness value of each pixel in the projection image, thereby changing the brightness of the projection image.

The laser projection device can determine the distance range between the target object and the laser projection device after the change, and based on The corresponding relationship between the distance range and the contrast is to adjust the contrast of the projection image to the contrast corresponding to the distance range between the target object and the laser projection device after the change.

In one embodiment, if the laser projection device determines that the changed distance between the target object and the laser projection device is within the first distance range, it can determine the distance between the target object and the first distance range from the corresponding relationship between the distance range and the contrast. corresponding first contrast, and adjust the contrast of the projected image to the first contrast.

If the laser projection device determines that the changed distance between the target object and the laser projection device is within the second distance range, it can determine the second contrast corresponding to the second distance range from the corresponding relationship between the distance range and the contrast, and set The contrast of the projected image is adjusted to the second contrast.

If the laser projection device determines that the changed distance between the target object and the laser projection device is within the third distance range, it can determine the third contrast corresponding to the third distance range from the corresponding relationship between the distance range and the contrast, and The contrast of the projected image is adjusted to the third contrast.

If the laser projection device determines that the changed distance between the target object and the laser projection device is within the fourth distance range, it can determine the fourth contrast corresponding to the fourth distance range from the corresponding relationship between the distance range and the contrast, and The contrast of the projected image is adjusted to the fourth contrast.

Wherein, the first contrast is smaller than the second contrast, the second contrast is smaller than the third contrast, the third contrast is smaller than the fourth contrast, and the fourth contrast is equal to the original contrast. The original contrast may be the contrast of the projected image without adjusting the contrast of the projected image. For example, referring to FIG. 10 , the first contrast may be 60% of the original contrast, and the second contrast may be 80% of the original contrast. The third contrast may be greater than 80% of the original contrast and less than the original contrast. The fourth contrast may be the original contrast.

When the distance between the target object and the laser projection equipment becomes shorter, by reducing the contrast of the projected image, the eyes of the target object are effectively protected. When the distance between the target object and the laser projection equipment becomes longer, by increasing the contrast of the projection image, the displayed projection image will be clearer and the viewing effect will be better.

The laser projection device can determine the distance range between the changed target object and the laser projection device, and based on the corresponding relationship between the distance range and the color saturation, adjust the color saturation of the projection picture to be consistent with the changed target object. Color saturation corresponding to the range of distances from the laser projection device.

Referring to Figure 11, if the laser projection device determines that the distance between the target object and the laser projection device after the change is within the first distance range (or the second distance range), it can determine from the corresponding relationship between the distance range and the color saturation. The first color saturation corresponding to the first distance range (or the second distance range), and the color saturation of the projected image is adjusted to the first color saturation.

If the laser projection device determines that the changed distance between the target object and the laser projection device is within the third distance range (or the fourth distance range), it can determine the third distance from the corresponding relationship between the distance range and the color saturation. the second color saturation corresponding to the range (or the fourth distance range), and adjust the color saturation of the projected image to the second color saturation.

Wherein, the color gamut of the second color saturation is wider than the color gamut of the first color saturation, that is, the types of colors included in the second color saturation are wider than the types of colors included in the first color saturation. many.

When the distance between the target object and the laser projection equipment becomes shorter, the color saturation of the projected image is reduced, effectively protecting the target's eyes. When the distance between the target object and the laser projection equipment becomes longer, by increasing the color saturation of the projected image, the displayed projected image will be more vivid and the viewing effect will be better.

The laser projection device can determine the distance range between the target object and the laser projection device after the change, and based on the correspondence between the distance range and the display ratio, adjust the display ratio of the projection screen to be the same as the distance between the target object and the laser after the change. The display ratio corresponding to the distance range of the projection device.

If the laser projection device determines that the distance between the target object and the laser projection device after the change is within the first distance range, it can determine the first display ratio corresponding to the first distance range from the corresponding relationship between the distance range and the display ratio. , and adjust the display ratio of the projected image to the first display ratio.

If the laser projection device determines that the changed distance between the target object and the laser projection device is within the second distance range (or the third distance range or the fourth distance range), it can determine from the corresponding relationship between the distance range and the display ratio. The second The second display ratio corresponding to the distance range (or the third distance range or the fourth distance range), and the display ratio of the projected image is adjusted to the second display ratio. The second display ratio is larger than the first display ratio. For example, referring to FIG. 12 , the second display ratio may be 16:9, and the first display ratio may be 4:3.

When the distance between the target object and the laser projection equipment becomes shorter, by reducing the display ratio of the projection image, the projection image viewed by the target object is smaller, effectively protecting the eyes of the target object. When the distance between the target object and the laser projection equipment becomes longer, by increasing the display ratio of the projection image, the projection image viewed by the target object is larger and the viewing effect is better.

In one embodiment, the laser projection device determines that the position of the target object has changed based on the first reflection signal and the second reflection signal, and the distance between the target object and the laser projection device after the change is the same as the distance between the target object and the laser projection device before the change. After the distance of the device is within different distance ranges. If the laser projection device determines that the distance between the target object and the laser projection device becomes shorter, it can expand the audio coverage, thereby changing the audio playback effect. If the laser projection device determines that the distance between the target object and the laser projection device becomes longer, it can reduce the coverage area of the audio, thus changing the audio playback effect.

The laser projection device can determine the distance range between the target object and the laser projection device after the change, and based on the correspondence between the distance range and the coverage range, adjust the playback range of the audio to be the same as the distance between the target object and the laser projection device after the change. The coverage range corresponding to the distance range of the device.

Referring to Figure 13, if the laser projection device determines that the distance between the target object and the laser projection device after the change is within the first distance range, it can determine the distance corresponding to the first distance range from the corresponding relationship between the distance range and the coverage range. first coverage range, and adjust the audio coverage range to the first coverage range.

If the laser projection device determines that the changed distance between the target object and the laser projection device is within the second distance range (or the third distance range or the fourth distance range), it can determine from the corresponding relationship between the distance range and the coverage range. The second distance range (or the third distance range or the fourth distance range) corresponds to the second coverage range, and the audio coverage range is adjusted to the second coverage range.

Wherein, both the first coverage range and the second coverage range may be coverage ranges on the first plane, and the coverage range of the audio may also be referred to as the sound effect field of view of the audio on the first plane. The lower limit of the first coverage range is smaller than the lower limit of the second coverage range, and greater than the lower limit of the detection angle of the detection device 30 on the first plane. The upper limit of the first coverage range is greater than the upper limit of the second coverage range, and less than the upper limit of the detection angle of the detection device 30 on the first plane. For example, the first coverage range may be [-30 degrees, 30 degrees], and the second coverage range may be [-15 degrees, 15 degrees].

Among them, the laser projection equipment can adjust the audio parameters to change the audio coverage. For example, laser projection equipment can adjust the phase of the audio, thereby changing the coverage of the audio.

In embodiments of the present disclosure, the laser projection device may include multiple audio players, and each audio player may be a speaker. The plurality of audio players correspond to different detection ranges of the laser projection device. The fact that the audio player corresponds to a detection range means that the sound emission direction of the audio player (ie, the propagation direction of the sound) is within the corresponding detection range. Referring to Figure 5, the laser projection device may include 2 audio players 98.

The multiple detection ranges may include multiple angle ranges, and the multiple audio players correspond to different angle ranges. The audio player corresponding to one angle range means that the sound emission direction of the audio player (ie, the propagation direction of the sound) is located within the corresponding angle range. Wherein, the plurality of audio players may include a first audio player and a second audio player. Correspondingly, the plurality of angle ranges may include a first angle range and a third angle range. The first audio player and the first audio player may include a first audio player and a second audio player. The angle range corresponds to the second audio player corresponding to the second angle range.

The lower limit of the first angular range is greater than or equal to the lower limit of the detection angle of the detection device 30 on the first plane, the upper limit of the first angular range is less than or equal to the lower limit of the second angular range, and the upper limit of the second angular range is less than or equal to The upper limit of the detection angle of the detection device 30 on the first plane. For example, the first angle range may be [-60 degrees, 0 degrees), and the second angle range may be [0 degrees, 60 degrees].

In an embodiment of the present disclosure, after changing the audio coverage, the laser projection device can play the audio through the two audio players, thereby changing the coverage of the audio played by the two audio players.

When the distance between the target object and the laser projection equipment becomes shorter, by expanding the audio coverage, the Audio coverage is the same as audio player coverage. When the distance between the target object and the laser projection device becomes longer, the audio coverage is reduced to make the played audio more three-dimensional.

The laser projection device determines that the position of the target object has changed based on the first reflection signal and the second reflection signal, and the azimuth angle of the target object after the change and the azimuth angle of the target object before the change are within different angle ranges. If the laser projection device determines that the target object is within the target detection range of the laser projection device, the volume of the audio played by the audio player corresponding to the target detection range can be increased, and the volume of the audio played by other audio players corresponding to other detection ranges can be reduced. volume, thereby changing the audio playback effect.

In one implementation, the plurality of audio players may include a third audio player, a fourth audio player, and a fifth audio player. Correspondingly, the multiple angle ranges may include a third audio player. There are three angle ranges including the angle range, the fourth angle range and the fifth angle range. The third audio player corresponds to the third angle range, the fourth audio player corresponds to the fourth angle range, and the fifth audio player corresponds to the fifth angle range.

The lower limit of the third angular range is greater than or equal to the lower limit of the detection angle of the detection device 30 on the first plane, the upper limit of the third angular range is less than or equal to the lower limit of the fourth angular range, and the upper limit of the fourth angular range is less than or equal to The lower limit of the fifth angular range and the upper limit of the fifth angular range are less than or equal to the upper limit of the detection angle of the detection device 30 on the first plane. For example, the third angle range may be [-60 degrees, -20 degrees), the fourth angle range may be [-20 degrees, 20 degrees), and the fifth angle range may be [20 degrees, 60 degrees] .

The laser projection device can determine the target angle range in which the azimuth angle of the target object is located after the change, and based on the correspondence between the angle range and the audio player, increase the volume of the audio played corresponding to the target angle range, and reduce the audio volume. The volume of audio played by other audio players corresponding to other angle ranges, thereby making the played audio more directional.

Among them, the laser projection device can reduce the volume of audio played by other audio players outside the detection range to 0, thereby achieving directional sound generation and making the user experience better.

In the embodiment of the present disclosure, the laser projection device can adjust the volume of the audio played by the audio player by adjusting the loudness equalization of the audio player.

The following describes the process by which the laser projection device determines the distance between the target and the detection device, the pitch angle of the target and the azimuth angle of the target based on the reflected signal reflected by the target:

After receiving the reflection signal reflected by the target object, the laser projection device can determine the difference signal based on the received reflection signal, and determine the distance between the target object and the detection device 30 based on the peak frequency of the difference signal, And based on the difference between the phase angles of two adjacent difference signals, the pitch angle and azimuth angle of the target object are determined.

In the embodiment of the present disclosure, the laser projection device can emit a detection signal, and at the same time, the laser projection device can receive a reflection signal reflected by the target object. Since the laser projection equipment has a certain time interval from transmitting the detection signal to receiving the reflected signal, the laser projection equipment can determine the time at a historical moment based on the detection signal emitted at a historical transmitting moment and the reflected signal received at a historical receiving moment. The difference signal IF between the two. The historical time may be the historical receiving time, or the average of the historical transmitting time and the historical receiving time. This historical moment can be called the first moment or the second moment.

It should be noted that the order of the steps of the control method for the laser projection equipment provided by the embodiments of the present disclosure can be adjusted appropriately, and the steps can also be deleted according to the situation. For example, the above-mentioned step 201 and step 202 can be deleted according to the situation. Any person familiar with the technical field can easily think of changing methods within the technical scope disclosed in the present disclosure, which should be covered by the protection scope of the present disclosure, and therefore will not be described again.

In summary, embodiments of the present disclosure provide a control method for a laser projection device. When the laser projection device determines that the position of the target object changes, the laser projection device can change the projection direction of the target object according to the changing parameters of the target object's position. The display effect of the projection screen on the projection screen, and/or changing the audio playback effect of the laser projection equipment. Since the display of the projected image and/or the playback effect of the audio can be flexibly changed according to the position of the target object, the functions of the laser projection equipment are enriched.

As a second possible implementation method, the projection screen projected by the laser projection device includes: video picture interfaces and interactive screens. In this implementation, referring to Figure 14, the control method of the laser projection device includes:

Step 301: Detect whether the human-computer interaction function of the laser projection device is turned on.

In an embodiment of the present disclosure, the laser projection device can detect whether its human-computer interaction function is turned on in response to the detection instruction. If the laser projection device detects that its human-computer interaction function is not turned on, step 302 can be performed. If the laser projection device detects that its human-computer interaction function has been turned on, step 303 can be performed.

Step 302: Display prompt information on the projection screen.

For the implementation process of step 302, please refer to the above description of step 202.

Step 303: In the process of projecting the video screen to the first display area and projecting the interactive screen to the second display area, a detection signal is emitted.

The projection screen may include multiple display areas corresponding to multiple azimuthal ranges of the laser projection device. Referring to Figure 15, the plurality of display areas may include a first display area 21 and a second display area 22 arranged sequentially along the long side direction S of the projection screen. The long side of the projection screen is parallel to the support surface of the laser projection device. An edge of the support surface can be parallel to the horizontal plane. The size of the first display area 21 and the size of the second display area 22 are both smaller than the size of the projection screen 20 , and the size of the first display area 21 and the size of the second display area 22 may or may not be equal. .

Referring to Figures 15 and 16, if the laser projection device detects that its human-computer interaction function is turned on, it can project the video screen 001 to the first display area 21 and project the interactive screen 002 to the second display area 22. , transmitting detection signals.

The interactive picture 002 may be a picture obtained by the interaction between the target object and the laser projection device. For example, the interactive picture 002 may include a posture picture of the target object.

Referring to FIG. 5 , the laser projection device may further include a detection device 30 for periodically emitting detection signals. The detection device 30 may be located on a side of the housing of the host 10 where the side intersects with the projection screen 20 . Or, referring to FIG. 5 , the detection device 30 is located on the side of the housing away from the projection screen 20 . The detection device 30 may be a millimeter wave sensor, and accordingly, the detection signal may be a millimeter wave signal. Referring to FIG. 6 , the detection angle θ1 of the detection device 30 in the first plane is greater than or equal to -60 degrees and less than or equal to 60 degrees. The first plane is parallel to the supporting surface of the laser projection device.

The plurality of azimuth angle ranges of the laser projection device may include a first azimuth angle range and a second azimuth angle range, the first display area corresponding to the first azimuth angle range, and the second display area corresponding to the second azimuth angle range. Wherein, the lower limit of the second azimuth angle range is greater than or equal to the minimum value of the detection angle θ -60 degrees, the upper limit of the second azimuth angle range is less than the lower limit of the first azimuth angle, and the upper limit of the first azimuth angle range is less than or It is equal to the maximum value of detection angle θ 60 degrees. For example, the first azimuth angle range may be [0 degrees, 60 degrees], and the second azimuth angle range may be [-60 degrees, 0 degrees). The laser projection device projects the video screen 001 to the first display area 21 and projects the interactive screen 002 to the second display area 22. At this time, the azimuth angle of the target object relative to the laser projection device is within the second azimuth range, for example, At this time, the azimuth angle of the target relative to the laser projection equipment can be -35 degrees.

The size of the above-mentioned projection screen 20 may be M×N, the size of the first display area 21 may be m1×n1, and the size of the second display area 22 may be m2×n2. M is the number of pixel rows that the projection screen 20 can display, and N is the number of pixel columns that the projection screen 20 can display. Both M and N are positive integers greater than 1. For example, M may be 2160 and N may be 3840.

m1 is the number of pixel rows that the first display area 21 can display, and n1 is the number of pixel columns that the first display area 21 can display. Both m1 and n1 are positive integers greater than 1, and m1 is less than or equal to M1 or n1 is less than or equal to N1. For example, m1 can be 2160 and n1 can be 1920.

m2 is the number of pixel rows that the second display area 22 can display, and n2 is the number of pixel columns that the first display area 202 can display. Both m2 and n2 are positive integers greater than 1, and m2 is less than or equal to M1 or n2 is less than or equal to N1. For example, m2 can be 2160 and n2 can be 1920.

In the embodiment of the present disclosure, the resolution of the video picture 001 and the resolution of the interactive picture 002 are both smaller than the projection screen. 20 size, and the resolution of the video picture 001 and the resolution of the interactive picture 002 may or may not be equal. If the size of the first display area 21 is equal to the size of the second display area, the resolution of the video picture and the resolution of the interactive picture 002 may be less than or equal to the size of the first display area 21 . For example, the size of the first display area 21 , the size of the second display area, the resolution of the video picture 001 and the resolution of the interactive picture 002 may all be 2160×1920. In the embodiment of the present disclosure, the size of the first display area 21 is equal to the size of the second display area 22, the resolution of the video picture 001 and the resolution of the interactive picture 002 are equal, and the size of the first display area 21 is equal to the size of the video picture 001. The resolution will be explained as an example.

In an embodiment of the present disclosure, if the laser projection device detects a startup instruction for the somatosensory interactive application, it can project the video image provided by the somatosensory interactive application to the projection screen in response to the start instruction for the somatosensory interactive application. In one implementation, the somatosensory interaction application may include applications such as fitness applications and game applications. If the somatosensory interactive application is a game application, the video picture can be a game example picture, and the target object can play the game under the guidance of the game example picture. The corresponding interactive picture can be the target object's posture towards the target object during the game playing process. It can be harvested. If the somatosensory interactive application is a fitness application, the video screen can be a fitness example screen, and the target object can exercise under the guidance of the fitness example screen. The corresponding interactive screen can be the posture of the target object captured during the fitness process. of.

When the laser projection device projects the video picture provided by the somatosensory interactive application to the projection screen, if the target object is detected, the interactive picture can be obtained. Alternatively, when the laser projection device projects the video picture provided by the somatosensory interactive application to the projection screen, if it detects that the posture of the target object is the target posture, the interactive picture can be obtained. The laser projection device then projects the video image to the first display area, and projects the interactive image to the second display area. Moreover, the laser projection device can periodically emit detection signals during the process of projecting the video image to the first display area and projecting the interactive image to the second display area.

Wherein, the target posture may include one or more of the following: a posture with a moving distance greater than a distance threshold; a posture with a movement frequency greater than a first frequency threshold; a posture with a swing amplitude greater than an amplitude threshold; a posture with a swing frequency greater than a second frequency threshold. Wherein, the distance threshold, the first frequency threshold, the amplitude threshold and the second frequency threshold can be fixed values pre-stored in the laser projection device. The target posture can be a fixed posture pre-stored in the laser projection device.

Referring to FIG. 5 , a camera 003 may be provided on the side of the projection screen 20 close to the host 10 , and the camera 003 is connected to the laser projection device. In one implementation, the camera 003 can be connected to the laser projection device through a universal serial bus (USB) interface. If the laser projection device detects the target object or detects that the posture of the target object is the target posture, it can control the camera 003 to shoot the target object to obtain an interactive picture. The camera 003 can then send the interactive image to the laser projection device. After receiving the interactive screen, the laser projection device can project the video screen to the first display area and project the interactive screen to the second display area.

Step 304: Receive the first reflection signal reflected by the target at the first time and the second reflection signal reflected at the second time.

In the process of projecting the video picture to the first display area and projecting the interactive picture to the second display area, the laser projection device can receive the target object located in front or side of the laser projection device in the first display area after emitting the detection signal. moment and the reflected signal reflected at the second moment. The reflection signal reflected by the target object at each moment may be generated by the detection signal reflected by the target object at that moment.

In the embodiment of the present disclosure, the detection device 30 can also receive reflection signals reflected by the target object at different times.

Step 305: If it is determined that the position of the target object changes based on the first reflection signal and the second reflection signal, and when the first azimuth angle and the second azimuth angle are in different azimuth angle ranges, change the display effect of the projection screen, and/or, change the audio playback effect.

The first azimuth angle may be the azimuth angle of the position of the target object at the first time relative to the laser projection device, and the second azimuth angle may be the azimuth angle of the position of the target object at the second time relative to the laser projection device. After receiving the reflection signals reflected by the target object at the first moment and the second moment, the laser projection device can determine the azimuth angle of the target object relative to the laser projection device at each moment. Afterwards, the laser projection device can determine whether the azimuth angle of the target object relative to the laser projection device changes based on the reflection signals at the two moments.

If the laser projection equipment determines that the azimuth angle of the target object relative to the laser projection equipment has not changed, there is no need to change the display effect of the projection screen, and there is no need to change the audio playback effect. If the laser projection equipment determines that the azimuth angle of the target object relative to the laser projection equipment has changed, and the azimuth angle after the change is within the same azimuth angle range as the azimuth angle before the change, the azimuth angle of the target object relative to the laser projection equipment can be determined. Minor changes occur, so there is no need to change the display effect of the projected image, and there is no need to change the audio playback effect.

If the laser projection equipment determines that the azimuth angle of the target object relative to the laser projection equipment has changed, and the azimuth angle after the change and the azimuth angle before the change are in different azimuth angle ranges, then the azimuth angle of the target object relative to the laser projection equipment can be determined. The angle changes greatly, so the display effect of the projected image can be changed, and/or the audio playback effect can be changed.

In the embodiment of the present disclosure, the laser projection device can change the display effect of the projection image by changing the display position of the interactive image on the projection screen. Among them, when the laser projection equipment changes the display position of the interactive picture on the projection screen, if it detects that the changed azimuth angle is within the target azimuth angle range among multiple azimuth angle ranges, the interactive picture can be displayed in the same position as the target. Within the target display area corresponding to the azimuth range.

In one implementation, if the laser projection device detects that the changed azimuth angle is within the target azimuth angle range corresponding to the first display area, the interactive screen can be projected to the first display area and the video screen can be projected to In the second display area, the display position of the interactive picture on the projection screen is changed, and the display position of the video picture on the projection screen is changed.

For example, if the azimuth angle before change is -35 degrees (that is, the azimuth angle of the target object relative to the laser projection device in step 303 is -35 degrees), then before the azimuth angle of the target object relative to the laser projection device changes, , the laser projection device can project the video screen 001 to the first display area 21 and project the interactive screen 002 to the second display area 22 .

If the changed azimuth angle is 20 degrees, the first azimuth angle range where the changed azimuth angle is 20 degrees is different from the second azimuth angle range where the azimuth angle -35 degrees before the change is located, and the changed azimuth angle is The azimuth angle of 20 degrees is within the first azimuth angle range corresponding to the first display area, so the laser projection device can project the video picture 001 to the second display area 22 and the interactive picture 002 to the first display area 21 .

Referring to Figure 15, Figure 16 and Figure 17, if the target object is located on the right side of the projection screen (that is, the azimuth angle of the target object relative to the laser projection device is within the second angle range), the laser projection device can display and project the video screen 001 to the left display area of the projection screen (ie, the first display area 21 ), and project the interactive image 002 of the target object to the right display area of the projection screen (ie, the second display area 22 ). If the target object is located on the left side of the projection screen (that is, the azimuth angle of the target object relative to the laser projection device is within the first angle range), the laser projection device can display and project the video screen 001 to the right display area of the projection screen (that is, the target object is located on the left side of the projection screen). second display area 22), and projects the interactive image 002 of the target object to the left display area of the projection screen (ie, the first display area 21). As a result, the position of the interactive image on the projection screen can be flexibly adjusted according to the azimuth angle of the target object relative to the laser projection device, thereby providing a better viewing experience for the target object.

In an embodiment of the present disclosure, for the reflection signal at each time, after receiving the reflection signal reflected by the target object at that time, the laser projection device can determine the azimuth angle of the target object relative to the laser projection device at that time based on the reflection signal. β. Referring to Figure 8, the azimuth angle β of the target object relative to the laser projection equipment at a moment is the orthographic projection of the target connection line between the target object and the origin of the three-dimensional coordinate system XYZ in the coordinate system XY, and the angle between the second axis Y .

In the embodiment of the present disclosure, the process of the laser projection device detecting whether the posture of the target object is the target posture in step 303 is described below:

In the process of projecting the video image provided by the somatosensory interactive application to the projection screen, the laser projection device can also emit a detection signal, and can determine the position of the target object at that moment based on the reflected signal reflected by the target object at each moment. Furthermore, the laser projection equipment can determine the posture of the target object based on its position at different times. The posture of the target object may include movement and/or swing, and the swing may refer to a certain part of the target object's body swinging. For example, it can be the arm swing or leg swing of the target object.

In one embodiment, when the laser projection device determines the posture of the target object, the laser projection device may determine the position of the target object in the first duration based on the position of the target object before the first duration and the position after the first duration. The moving distance within the second period of time can be determined as the moving frequency of the target object. at the same time, The laser projection equipment can also determine the frequency of change of the position of a certain part of the target object within the third time period as the swing frequency of the target object, and can determine the frequency of change of the position of a certain part of the target object before the fourth time period and during the fourth time period. The position after the duration determines the swing amplitude of a certain part of the target. Afterwards, the laser projection device may determine whether the posture of the target object is the target posture based on at least one of the movement distance, movement frequency, swing amplitude, and swing frequency. The above-mentioned first duration, second duration, third duration and fourth duration may be the same or different.

Referring to FIG. 8 , the position of the target object may refer to the position of the target object in the three-dimensional coordinate system XYZ. The laser projection device can determine the distance d between the target and the detection device 30 at that time and the pitch angle ɑ of the target based on the reflected signal at each time. Furthermore, the laser projection device can determine the position of the target object based on the distance d between the target object and the laser projection device, the pitch angle ɑ and the azimuth angle β. The position of the target object 004 can be based on the position of the target object 0 in the three-dimensional reference coordinate system XYZ. The coordinates (x0, y0, z0) represent that x0=d×cosɑ×sinβ, y0=d×cosɑ×cosβ, and z0=d×sinɑ.

To sum up, embodiments of the present disclosure provide a control method for a laser projection device. If the laser projection device determines that the position of the target object has changed, it will change the image projected by the laser projection device according to the changing parameters of the position of the target object. The display effect of the projected image, and/or, changing the audio playback effect of the laser projection equipment. Since the display of the projected image and/or the playback effect of the audio can be flexibly changed according to the position of the target object, the functions of the laser projection equipment are enriched.

In the above second implementation manner, referring to Figure 18, the control method of the laser projection device may include:

Step 401: Detect whether the human-computer interaction function of the laser projection device is turned on.

In an embodiment of the present disclosure, the laser projection device can detect whether its human-computer interaction function is turned on in response to the detection instruction. If the laser projection device detects that its human-computer interaction function is not turned on, step 402 can be performed. If the laser projection device detects that its human-computer interaction function has been turned on, step 403 can be performed.

Step 402: Display prompt information on the projection screen.

For the implementation process of step 402, reference may be made to the relevant description of step 202 above.

Step 403: In the process of projecting the video picture to the projection screen and projecting the interactive picture to one of the multiple display areas, a detection signal is emitted.

If the laser projection device detects that its human-computer interaction function is turned on, it can emit a detection signal during the process of projecting the video image to the projection screen and projecting the interactive image to one of the multiple display areas. Among them, the video picture is projected on the projection screen in full screen. The interactive screen is a screen obtained by the interaction between the target object and the laser projection device. In one embodiment, the interactive screen may include at least one of a video chat interface and a search interface.

In embodiments of the present disclosure, the multiple display areas may include multiple display areas sequentially arranged along the longitudinal direction of the projection screen, and the multiple display areas correspond to multiple azimuth angle ranges of the laser projection device.

Furthermore, two adjacent display areas in the plurality of display areas may have a partially overlapping area. Correspondingly, there may also be overlap between two adjacent azimuth angle ranges in the multiple azimuth angle ranges. Or there is no overlap between two adjacent display areas in the multiple display areas, and accordingly, there is no overlap between two adjacent azimuth angle ranges in the multiple azimuth angle ranges. The size of the interactive screen may be less than or equal to the size of each display area in the multiple display areas. For example, if the size of the projection screen is 2160×3840, the multiple display areas include three display areas, and the three display areas There is a partially overlapping area between two adjacent display areas, and the size of a display area used to display an interactive screen can be 2160×1920, then the resolution of the interactive screen can be 540×1920.

Referring to FIG. 19 , the projection screen 20 may include three display areas arranged sequentially along the longitudinal direction S of the projection screen 20 . The three display areas are respectively the third display area 23 , the fourth display area 24 and the fifth display area. Area 25, the third display area 23 corresponds to the third azimuth range, the fourth display area 24 corresponds to the fourth azimuth range, and the fifth display area 25 corresponds to the fifth azimuth range.

Referring to FIG. 19 , if there is no overlapping area between two adjacent display areas among the three display areas, then there is no overlapping area between two adjacent azimuth angle ranges among the three azimuth angle ranges. In one implementation, the lower limit of the fifth azimuth angle range is greater than or equal to -60 degrees, and the upper limit of the fifth azimuth angle range is less than the lower limit of the fourth azimuth angle range. The upper limit of the fourth azimuth angle range is less than the lower limit of the third azimuth angle range, and the upper limit of the third azimuth angle range is less than or equal to 60 degrees. Example, the The fifth azimuth angle range may be [-60 degrees, -30 degrees), the fourth azimuth angle range may be [-30 degrees, 30 degrees), and the third azimuth angle range may be [30 degrees, 60 degrees].

If there is an overlapping area between two adjacent display areas among the three display areas, then there is also an overlapping area between two adjacent azimuth angle ranges among the three azimuth angle ranges. For example, the lower limit of the fifth azimuth angle range is greater than or equal to -60 degrees, and the upper limit of the fifth azimuth angle range is greater than the lower limit of the fourth azimuth angle range. The upper limit of the fourth azimuth angle range is greater than the lower limit of the third azimuth angle range, and the upper limit of the third azimuth angle range is less than or equal to 60 degrees. For example, the fifth azimuth angle range may be [-60 degrees, 0 degrees), the fourth azimuth angle range may be [-30 degrees, 30 degrees), and the third azimuth angle range may be [0 degrees, 60 degrees ]. The embodiment of the present disclosure takes as an example that there is no overlapping area between two adjacent display areas among three display areas.

Referring to Figures 19 and 20, the laser projection device can project the video screen 001 to the projection screen 20 and the interactive screen 002 to the third display area 23. At this time, the target object is located at the third azimuth angle relative to the azimuth angle of the laser projection device. Within the range, in one embodiment, the azimuth angle of the target object may be 35 degrees. Among them, the interactive screen 002 shown in FIG. 20 is a video chat interface, and the interactive screen 002 shown in FIG. 20 is a search interface.

In the process of projecting the video image to the projection screen, the laser projection device can respond to a start instruction for the video chat application (or search application), start the video chat application (or search application), and start the video chat application (or search application) from the video chat application (or Search application) to obtain the video chat interface (or search interface), thereby obtaining an interactive interface. After acquiring the interactive interface, the laser projection device can project the video image to the projection screen, and project the interactive image to one of the multiple display areas. In addition, the laser projection device can periodically emit detection signals during the process of projecting the video image to the projection screen and projecting the interactive image to one of the multiple display areas. The search application may be an application with a search function.

In the embodiment of the present disclosure, if the interactive screen is a search interface, after the laser projection device projects the video screen to the projection screen and projects the interactive screen to one of the multiple display areas, if the interactive screen receives After receiving the query instruction for the target content, the relevant information related to the target content can be queried, and the queried relevant information can be displayed in the interactive screen.

For example, if the video screen is a screen where the anchor provided by the live broadcast application introduces an item, and the target content is the item, then while the user is watching the video screen, if he is interested in the item in the video screen, he can start a search. application. Correspondingly, the laser projection device can respond to the startup instruction for the search application, start the search application, and obtain the search interface in the search application.

The search interface may include text input boxes and query buttons. The laser projection equipment can project the video image to the projection screen and project the search interface to one of the multiple display areas. Therefore, the user can enter text information related to the item in the text input box of the search interface, and can trigger the query button. After detecting the click instruction for the query button, the laser projection device can generate a query instruction for the item, and then the laser projection device can query the relevant information about the item, and can display the queried relevant information in the search interface. The relevant information of the item may include the price of the item in different shopping applications and jump links of the different shopping applications.

Step 404: Receive the first reflection signal reflected by the target at the first time and the second reflection signal reflected at the second time.

In the process of projecting video images to the projection screen and projecting interactive images to one of multiple display areas, the laser projection equipment can receive detection signals from targets located in front or to the side of the laser projection equipment after emitting detection signals. The reflected signal reflected at the first moment and the second moment.

Step 405: If it is determined that the position of the target object changes based on the first reflection signal and the second reflection signal, and when the first azimuth angle and the second azimuth angle are in different azimuth angle ranges, change the display effect of the projection screen, and/or, change the audio playback effect.

The first azimuth angle may be the azimuth angle of the position of the target object at the first time relative to the laser projection device, and the second azimuth angle may be the azimuth angle of the position of the target object at the second time relative to the laser projection device. If the laser projection device determines that the azimuth angle of the target object relative to the laser projection device has not changed, there is no need to change the display effect of the projected image and/or change the audio playback effect. If the laser projection equipment determines that the azimuth angle of the target object relative to the laser projection equipment changes, And the azimuth angle after the change (i.e., the second azimuth angle) and the azimuth angle before the change (i.e., the first azimuth angle) are within the same azimuth angle range, then it can be determined that the azimuth angle of the target relative to the laser projection equipment has changed slightly. , so there is no need to change the display effect of the projected image and/or change the audio playback effect.

If the laser projection equipment determines that the azimuth angle of the target object relative to the laser projection equipment has changed, and the azimuth angle after the change and the azimuth angle before the change are in different azimuth angle ranges, then the azimuth angle of the target object relative to the laser projection equipment can be determined. The angle changes greatly, so the display effect of the projected image can be changed, and/or the audio playback effect settings can be changed.

Among them, the laser projection equipment can change the display effect of the projection picture by changing the display position of the interactive picture on the projection screen.

In the embodiment of the present disclosure, when the laser projection device changes the display position of the interactive image on the projection screen, if it detects that the changed azimuth angle is within a target azimuth angle range among multiple azimuth angle ranges, the interactive image can be The picture is displayed in the target display area corresponding to the target azimuth range, and the full-screen video picture is projected to the projection screen unchanged.

In one implementation, before the azimuth angle of the target object changes, the laser projection device projects the video image to the projection screen and projects the interactive image to one of the multiple display areas. After it is determined that the azimuth angle of the target object relative to the laser projection equipment has changed, and the azimuth angle after the change and the azimuth angle before the change are in different azimuth angle ranges of the laser projection equipment. If the laser projection device detects that the changed azimuth angle is within the target azimuth range corresponding to another display area, it can project the interactive screen to the other display area and maintain the state of projecting the full-screen video screen to the projection screen. constant. In this way, the display position of the interactive picture on the projection screen can be flexibly changed according to the azimuth angle of the target object relative to the laser projection device, and the display position of the video picture on the projection screen can be changed, thereby making it easier to view the target object. Wherein, the other display area is another display area among the plurality of display areas except the above-mentioned one display area.

Referring to Figures 19 and 20, if the azimuth angle before change is 35 degrees (that is, the azimuth angle of the target object relative to the laser projection device in the above step 403 is 35 degrees), then in the azimuth angle of the target object relative to the laser projection device Before the change occurs, the laser projection device projects the full-screen video picture 001 to the projection screen, and projects the interactive picture 002 to the third display area 23 .

Referring to Figures 20 and 21, if the changed azimuth angle is 0 degrees, then because the fourth azimuth angle range where the changed azimuth angle is 0 degrees is different from the third azimuth angle range where the azimuth angle before the change is located, And the changed azimuth angle of 0 degrees is within the fourth azimuth angle range corresponding to the fourth display area 24. Therefore, the laser projection device can project the interactive screen 002 to the fourth display area 24 and keep projecting the video screen 001 in full screen. The status of the projection screen remains unchanged.

Referring to Figures 21 and 22, if the azimuth angle before change is 0 degrees, before the azimuth angle of the target object relative to the laser projection device changes, the laser projection device projects the video screen 001 to the projection screen in full screen and displays the interactive screen. 002 is projected to the fourth display area 24. If the azimuth angle after the change is -50 degrees, the fifth azimuth angle range of the changed azimuth angle of -50 degrees is different from the fourth azimuth angle range of the azimuth angle before the change, and the changed azimuth angle The angle -50 degrees is within the fifth azimuth angle range corresponding to the fifth display area 25. Therefore, the laser projection device can project the interactive picture 002 to the fifth display area 25 and maintain the full-screen projection of the video picture 001 to the projection screen. The status remains unchanged.

Referring to Figures 19 to 23, if the target object is located in the left display area of the projection screen (that is, the azimuth angle of the target object relative to the laser projection device is within the third angle range), the laser projection device can display video picture 001 in full screen Project to the projection screen, and project the interactive screen 002 to the left display area of the projection screen (ie, the third display area 23).

If the target object is located in the middle display area of the projection screen (that is, the azimuth angle of the target object relative to the laser projection device is within the fourth angle range), the laser projection device can project video picture 001 to the projection screen in full screen, and interactively The picture 002 is projected to the middle display area (ie, the fourth display area 24) of the projection screen.

If the target object is located in the right display area of the projection screen (that is, the azimuth angle of the target object relative to the laser projection device is within the fifth angle range), the laser projection device can project video picture 001 to the projection screen in full screen, and The interactive screen 002 is projected to the right display area of the projection screen (ie, the fifth display area 25). As a result, the position of the interactive image on the projection screen can be flexibly adjusted according to the azimuth angle of the target relative to the laser projection device.

To sum up, embodiments of the present disclosure provide a control method for a laser projection device. If the laser projection device determines that the position of the target object changes, the laser projection device changes the projection direction according to the changing parameters of the target object's position. Screen The display effect of the projection screen on the screen, and/or, change the audio playback effect of the laser projection equipment. Since the display of the projected image and/or the playback effect of the audio can be flexibly changed according to the position of the target object, the functions of the laser projection equipment are enriched.

The relevant implementation process of the above-mentioned steps 401 to 405 may also refer to the above-mentioned steps 301 to 305, and the embodiments of the present disclosure will not be repeated here.

It should be noted that the sequence of the steps of the control method for the laser projection equipment provided by the embodiment of the present disclosure can be appropriately adjusted, and the steps can also be deleted according to the situation. For example, the above-mentioned steps 301 and 302 can be deleted according to the situation, or the above-mentioned steps can be deleted according to the situation. Step 401 and step 402 can be deleted according to the situation. Any person familiar with the technical field can easily think of changing methods within the technical scope disclosed in the present disclosure, which should be covered by the protection scope of the present disclosure, and therefore will not be described again.

FIG. 24 is a schematic structural diagram of yet another projection device provided by an embodiment of the present disclosure. Referring to FIG. 24 , the laser projection device may include a main board 40 , a display panel 50 , a light valve 60 , a projection lens 70 , a light source 80 and an optical-mechanical component 90 . The light source 80 may include at least one of a red laser light source, a blue laser light source, and a green laser light source. Among them, the light valve 60 can transmit the light beam irradiated by the light source 80 to its surface to the projection lens 70 through the opto-mechanical assembly 90 . The projection lens 70 is used to project the light beam transmitted by the optical-mechanical assembly 90 to the projection screen 20 to project and display the projection image on the projection screen 20 . The projection screen may include at least one of a video screen and an interactive screen.

In the embodiment of the present disclosure, the detection device 30 is used to emit a detection signal and receive a reflection signal reflected by a target object in front or on the side of the laser projection device. The detection device 30 is also used to determine the position of the target object based on the reflected signal.

Referring to Figure 24, if the detection device 30 is connected to the mainboard 40, the detection device 30 can send the determined position of the target object to the mainboard 40, then the above steps 101, 102, 203, 204, 303, and 304, Steps 403 and 404, as well as the determination of the position of the target object based on the reflected signal in steps 103, 205, 305 and 405 may all be performed by the detection device 30. The remaining technical features of step 103, step 205, step 305 and step 405 are all executed by the motherboard 40. Alternatively, the detection device 30 may send the received reflected signal to the main board 40 . The mainboard 40 can determine the position of the target object according to the transmission signal, then the above steps 101, 102, 203, 204, 303, 304, 403 and 404 can be performed by the detection device 30, the above steps 103, Step 205, step 305 and step 405 are executed by the mainboard 40.

If the detection device 30 is connected to the display panel 50, the detection device 30 can send the determined position of the target object to the display panel 50, then the above steps 101, 102, 203, 204, 303, 304, and 403 and step 404, as well as determining the position of the target object based on the reflected signal in steps 103, 205, 305 and 405 may all be performed by the detection device 30. The remaining technical features of steps 103, 205, 305 and 405 are all performed by the display panel 50. Alternatively, the detection device 30 may send the received reflected signal to the display panel 50 . The display panel 50 can determine the position of the target object according to the transmitted signal, then the above steps 101, 102, 203, 204, 303, 304, 403 and 404 can be performed by the detection device 30, the above step 103 , step 205, step 305 and step 405 are executed by the display panel 50.

Embodiments of the present disclosure provide a laser projection device, which is used for:

Send detection signal.

The first reflection signal reflected by the target object at the first moment and the second reflection signal reflected at the second moment are received. The first reflection signal and the second reflection signal are signals generated by the target object reflecting the detection signal.

If it is determined that the position of the target object changes according to the first reflection signal and the second reflection signal, the display effect of the projection screen projected by the laser projection device to the projection screen is changed according to the change parameter of the target object's position, and/or the display effect is changed. The audio playback effect of laser projection equipment.

To sum up, embodiments of the present disclosure provide a laser projection device. When the position of the laser projection device determines that the target object changes, the projection projected by the laser projection device to the projection screen is changed according to the changing parameters of the position of the target object. The display effect of the picture, and/or, change the audio playback effect of the laser projection equipment. Because it can adjust according to the position of the target object, It can flexibly change the display of the projected image and/or the playback effect of the audio, thus enriching the functions of the laser projection equipment.

In one implementation, the projected image includes: at least one of a video image and an interactive image, and the interactive image is an image obtained by interaction between the target object and the laser projection device.

In one embodiment, the laser projection device is used to: if it is determined that the distance between the target object and the laser projection device becomes shorter, reduce the brightness of the projected image, the contrast of the projected image, the color saturation of the projected image and the At least one of the display ratios. If it is determined that the distance between the target object and the laser projection device becomes longer, at least one of the brightness of the projection image, the contrast of the projection image, the color saturation of the projection image and the display ratio of the projection image is increased.

Referring to FIG. 24 , the laser projection device may further include a light source driving component 91 , which is connected to the light source 80 and the display panel 50 respectively.

The display panel 50 may have a corresponding relationship between brightness and current control signals stored in advance. In the process of changing the brightness of the projection screen, the display panel 50 determines the target brightness corresponding to the distance range between the target object and the laser projection device, and can determine from the corresponding relationship between the brightness and the current control signal. The target current control signal corresponding to the target brightness. Afterwards, the display panel 50 may send the target current control signal to the light source driving component 91 , and the light source driving component 91 may send the target driving current to the light source 80 in response to the target current control signal. The light source 80 emits a laser beam driven by the target driving current.

Among them, in the corresponding relationship between the brightness and the current control signal, the duty cycle of the current control signal is positively related to the brightness, that is, the smaller the duty cycle of the current control signal, the light source driving component 91 sends a signal to the light source 80 The smaller the driving current, the correspondingly lower brightness; the larger the duty cycle of the current control signal, the larger the driving current sent by the light source driving component 91 to the light source 80, correspondingly the higher the brightness.

In one implementation, the laser projection device is used to expand the audio coverage if it is determined that the distance between the target object and the laser projection device becomes shorter. If it is determined that the distance between the target object and the laser projection device becomes longer, the audio coverage range is reduced.

In one embodiment, referring to FIG. 24 , the laser projection device may include multiple audio players 98 , and the multiple audio players 98 correspond to different detection ranges of the laser projection device. Laser projection equipment for:

If it is determined that the target object is within the target detection range of the laser projection device, the volume of the audio played by the audio player corresponding to the target detection range is increased, and the volume of the audio played by other audio players corresponding to other detection ranges is reduced.

Referring to FIG. 24 , the laser projection device may further include a power amplifier component 91 connected to the motherboard 40 and the audio player 98 respectively. The mainboard 40 is used to send audio to the power amplifier assembly 91 . The power amplifier component 91 is used to amplify the audio and drive the audio player 98 to play the audio.

In one implementation, the laser projection device is configured to emit a detection signal if the human-computer interaction function of the laser projection device is turned on.

In one implementation, the laser projection device is configured to: if the human-computer interaction function of the laser projection device is not turned on, display prompt information, and the prompt information is used to prompt to turn on the human-computer interaction function.

Referring to Figure 24, the detection device 30 may include a power drive circuit 31, a signal generation circuit 32, a signal transmitter 33, a signal mixing circuit 34, a plurality of signal receivers 35, a filter 36, a digital-to-analog converter 37, and a data processing circuit. 38 and controller 39.

The power driving circuit 31 is connected to the signal generating circuit 32 , and the power driving circuit 31 is used to transmit a driving signal to the signal generating circuit 32 .

The signal generation circuit 32 is connected to the signal mixing circuit 34 and the signal transmitter 33 respectively. The signal generation circuit 32 is used to generate a detection signal driven by the driving signal transmitted by the power driving circuit 31, and transmit the generated detection signal to the signal respectively. Transmitter 33 and signal mixing circuit 34.

The signal transmitter 33 is used to transmit a detection signal. The signal transmitter 33 may include at least one transmitting antenna. For example, the signal transmitter 33 may include two transmitting antennas. The signal receiver 35 is connected to the signal mixing circuit 34 , and each signal receiver 35 is used to receive the reflected signal reflected by the target object, and transmit the received reflected signal to the signal mixing circuit 34 .

The signal mixing circuit 34 is also connected to the filter 36. The signal mixing circuit 34 is used to transmit according to the signal generating circuit 33. The detection signal and the received reflected signal transmitted by each signal receiver 35 determine a plurality of difference signals corresponding to the plurality of signal receivers 35 one-to-one, and the plurality of difference signals are transmitted to the filter 36 .

The filter 36 is also connected to the digital-to-analog converter 37 . The filter 36 is used to filter multiple difference signals and transmit the filtered multiple difference signals to the digital-to-analog converter 37 .

The digital-to-analog converter 37 is also connected to the data processing circuit 38 . The digital-to-analog converter 37 is used to convert the plurality of filtered difference signals into analog signals, and transmit the plurality of analog signals to the data processing circuit 38 .

The data processing circuit 38 is also connected to the controller 39. The data processing circuit 38 is used to determine the peak frequency of each analog signal and the difference in phase angle of two adjacent analog signals, and convert the peak values of the multiple analog signals into The frequency and the difference between the phase angles of two adjacent analog signals are transmitted to the controller 39 .

The controller 39 is used to determine the distance d between the target object and the detection device 30 according to the peak frequencies of the plurality of analog signals. And based on the differences between multiple phase angles, the pitch angle ɑ and azimuth angle β of the target object are determined. The distance d between the target object and the detection device 30 , the pitch angle ɑ and the azimuth angle β are then sent to the main board 40 .

In one embodiment, the controller 39 is also connected to the power drive circuit 31 , and the controller 39 is used to transmit driving instructions to the power drive circuit 31 . The power driving circuit 31 is used to transmit driving signals to the signal generating circuit 33 in response to driving instructions.

If the detection device 30 is a millimeter wave sensor, the detection signal can be a millimeter wave signal. Referring to Figures 25 and 26, the millimeter wave signal can be a linear frequency modulation pulse signal, the amplitude A of which changes sinusoidally with time t. And the frequency f changes linearly with time t. The detection signal transmitted by the signal generation circuit 33 received by the signal mixing circuit 34 is the detection signal transmitted by the signal transmitter 33 .

Referring to Figure 27, since the signal generation circuit 32 transmits the detection signal 0031 to the signal mixing circuit 34, there is a certain time interval Ta between the signal receiver 35 receiving the detection signal 0032. Therefore, the signal mixing circuit 34 can transmit the signal 0031 according to the signal generation circuit 32. The detection signal 0031 and the detection signal 0032 transmitted by the signal receiver 35 determine the difference signal IF.

In the embodiment of the present disclosure, in the process of determining the distance between the target object and the laser projection device, the controller 39 may determine the initial distance corresponding to the peak frequency of each analog signal, and use the determined multiple initial distances The mean value of the distance is determined as the distance d between the target object and the laser projection device.

In one embodiment, the controller 39 may pre-store the corresponding relationship between frequency and distance. After determining the peak frequency of each analog signal, the controller 39 may determine the corresponding relationship between the frequency and the distance. The initial distance D corresponding to the peak frequency of the analog signal.

Among them, in the corresponding relationship between the frequency and the distance, the distance The V is the transmission speed of the detection signal, and F is the frequency in the corresponding relationship between frequency and distance. Referring to Figure 25, the Tc is the time it takes for the detection signal transmitted by the signal transmitter 33 to increase from the initial frequency f0 to the maximum frequency f1. The B is the bandwidth of the detection signal transmitted by the signal transmitter 33 . For example, the initial frequency f0 may be 77 gigahertz (GHz), the bandwidth B may be 4GHz, the duration Tc may be 40 microseconds (μs), and the maximum frequency f1 may be 81GHz.

In one embodiment, the controller 39 may also pre-store the corresponding relationship between the phase angle difference, the azimuth angle and the pitch angle. After determining the difference in phase angles of two adjacent analog signals, the controller 39 can determine the difference in phase angles of the two adjacent analog signals from the corresponding relationship between the difference in phase angles, the azimuth angle, and the pitch angle. The azimuth and elevation angles corresponding to the values.

In the embodiment of the present disclosure, in the process of determining the azimuth angle and pitch angle of the target object, the data processing circuit 38 can determine the initial arrival angle corresponding to multiple differences, and determine the average value of the multiple determined initial arrival angles as The target arrival angle, and then the data processing circuit 38 can determine the azimuth angle and elevation angle of the target object based on the target arrival angle. The arrival angle η of the target relative to the signal transmitter 33 can be as shown in FIG. 28 .

In one implementation, the data processing circuit 38 may also pre-store the corresponding relationship between the phase angle difference and the arrival angle. After determining the difference in phase angles of the analog signals corresponding to two adjacent signal receivers 35, the data processing circuit 38 can determine the difference between the two adjacent signal receivers based on the corresponding relationship between the difference in phase angles and the angle of arrival. 35 corresponding analog signal The initial arrival angle corresponding to the difference in phase angle.

In the corresponding relationship between the above phase angle difference and the arrival angle, the arrival angle η satisfies: Wherein, ΔΦ is the difference in phase angles of analog signals corresponding to two adjacent signal receivers 35. Referring to FIG. 9, L is the separation distance between two adjacent signal receivers 25.

Referring to FIG. 24 , the display panel 50 may include a main control circuit 501 , a display driving circuit 502 and a first memory 503 . The main control circuit 501 and the display driving circuit 502 are both connected to the light source driving assembly 91 and the mainboard 40 . The first memory 503 is connected to the display driving circuit 502, and the first memory 503 is used to store the primary color level values of the pixels in the projection screen. The display driving circuit 502 is also used to obtain the stored primary color level value of the pixel in the projection image from the first memory 503, and control the light valve to flip according to the primary color level value of the pixel in the projection image, so as to project and display the projection image. to the projection screen. The main control circuit 501 may be the display control chip 52 shown in FIG. 2 .

Assume that the light source 80 includes a red laser, a green laser, and a blue laser. The display driving circuit 502 can output a red PWM signal R_PWM corresponding to the red laser based on the red primary color component of the projected image, output a green PWM signal G_PWM corresponding to the green laser based on the green primary color component of the projected image, and output a green PWM signal G_PWM corresponding to the green laser based on the blue primary color component of the projected image. A blue PWM signal B_PWM corresponding to the blue laser is output, and a yellow PWM signal Y_PWM is output based on the yellow primary color component of the projection screen. Furthermore, the display driving circuit 502 can output the enable signal R_EN corresponding to the red laser through the main control circuit 501 based on the lighting duration of the red laser in the driving cycle, thereby causing the red laser to emit a laser beam. Based on the lighting time of the green laser in the driving cycle, the main control circuit 501 outputs an enable signal G_EN corresponding to the green laser, thereby causing the green laser to emit a laser beam. Based on the lighting time of the blue laser in the driving cycle, the main control circuit 501 outputs an enable signal B_EN corresponding to the blue laser, thereby causing the blue laser to emit a laser beam. Based on the lighting time of the red laser and the green laser in the driving cycle, the main control circuit 501 outputs the enable signal R_EN corresponding to the red laser and the enable signal G_EN corresponding to the green laser, so that the red laser outputs a red laser beam, and the green laser beam The laser outputs a green laser beam, and the red laser beam and the green laser beam are superimposed to form a yellow laser beam.

Referring to FIG. 24 , the laser projection device may also include a fan 93 connected to the main control circuit 501 . The fan 93 is used to cool down the components inside the display panel 50 under the control of the main control circuit 501 .

Referring to FIG. 24 , the laser projection device may also include a power supply 94 , which is connected to the light source driving assembly 91 , the display panel 50 and the main board 40 respectively. The power supply 94 is used to power the light source driving assembly 91 , the display panel 50 and the main board 40 . The power supply voltage provided by the power supply 94 to the light source driving component 91 is 48 volts (V). The power supply voltage provided by the power supply 94 to the display panel 50 is 12V, and the power supply voltage provided by the power supply 94 to the main board 40 is 12V. The mainboard 40 can provide power for the detection device 30, and the power supply voltage can be 3.3V. The power supply 94 may be located on the power board 00 shown in FIG. 2 .

Referring to FIG. 24 , the laser projection device may also include a light valve adapter plate 95 and a socket 96 . The light valve adapter board 95 is connected to the display driving circuit 502 and the socket 96 in the display panel 50 respectively, and the socket 96 is also connected to the light valve 60 . The display driving circuit 502 is used to generate a light valve control signal according to the pixel value of the pixel in the projection screen, and transmit the light valve control signal to the light valve 60 through the light valve adapter plate 95 and the socket 96 .

Referring to FIG. 24 , the laser projection device may further include a temperature detector 97 connected to the main control circuit 501 , and the temperature detector 97 is used to detect the temperature inside the display panel 50 under the control of the main control circuit 501 .

The laser projection device may also include a second memory 99, which is used to store the above-mentioned plurality of detection ranges, target values, etc.

To sum up, embodiments of the present disclosure provide a laser projection device that changes the position of the target object when determining it, and the position after the change and the position before the change are within different detection ranges of the laser projection device, Then you can change the display effect of the projected image, and/or change the audio playback effect. Since the display of the projected image and/or the playback effect of the audio can be flexibly changed according to the position of the target object, the functions of the laser projection equipment are enriched.

It should be noted that the information involved in this application (including but not limited to the reflected signal reflected by the target object, the target and The distance of the laser projection equipment, the pitch angle of the target and the azimuth angle of the target, etc.) are authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data need to comply with the relevant laws and regulations of relevant countries and regions. Laws, regulations and standards. For example, the reflected signals reflected by the target objects involved in this application were all obtained with full authorization.

In this application, the terms "first", "second", "third" and "fourth" are used to distinguish the same or similar items with substantially the same functions and functions. It should be understood that "first", " There is no logical or temporal dependency between the second" and the "nth", and there is no limit on the number or execution order.

In the embodiment of this disclosure, the term "and/or" is only an association relationship describing associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, and A and B exist simultaneously. , there are three situations of B alone. In the embodiment of the present disclosure, the term “plurality” means two or more.

The above are only optional embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection of the present disclosure. within the range.

Claims

A control method for laser projection equipment, characterized in that the method includes:

Emit detection signals;

Receive the first reflection signal reflected by the target at the first time and the second reflection signal reflected at the second time. The first reflection signal and the second reflection signal are generated by the target object reflecting the detection signal. signal of;

If it is determined that the position of the target object changes according to the first reflection signal and the second reflection signal, then the projection projected by the laser projection device to the projection screen is changed according to the change parameter of the position of the target object. The display effect of the picture, and/or, changing the audio playback effect of the laser projection device.
The method according to claim 1, characterized in that the projection picture includes: at least one of a video picture and an interactive picture, and the interactive picture is a picture obtained by the interaction between the target object and the laser projection device. .
The method according to claim 1 or 2, characterized in that the change parameter includes a detection range in which the position of the target object is located, and the laser projection is changed according to the change parameter of the position of the target object. The display effect of the projection screen projected by the device onto the projection screen, and/or changing the playback effect of the audio played by the laser projection device, including:

When the position after change and the position before change are within different detection ranges of the laser projection device, the display effect of the projection image is changed, and/or the playback effect of the audio is changed.
The method according to claim 3, characterized in that said changing the display effect of the projection screen includes:

If it is determined that the distance between the target object and the laser projection device becomes shorter, the brightness of the projection screen, the contrast of the projection screen, the color saturation of the projection screen and the display of the projection screen are reduced. At least one of the proportions;

If it is determined that the distance between the target object and the laser projection device becomes longer, the brightness of the projection screen, the contrast of the projection screen, the color saturation of the projection screen and the brightness of the projection screen are increased. At least one of the display ratios.
The method according to claim 3, characterized in that said changing the playback effect of the audio includes:

If it is determined that the distance between the target object and the laser projection device becomes shorter, expand the coverage of the audio;

If it is determined that the distance between the target object and the laser projection device becomes longer, the coverage range of the audio is reduced.
The method according to any one of claims 3 to 5, wherein the laser projection device includes multiple audio players, and the multiple audio players correspond to different detection ranges of the laser projection device; Change the playback effect of the audio, including:

If it is determined that the target object is located within the target detection range of the laser projection device, increase the volume of the audio played by the audio player corresponding to the target detection range, and reduce other audio playback corresponding to other detection ranges. The volume of the audio played by the device.
The method according to claim 1 or 2, characterized in that the changing parameter includes the azimuth angle of the target object relative to the laser projection device, and the laser light is changed according to the changing parameter of the position of the target object. The display effect of the projection screen projected by the projection device to the projection screen, and/or changing the playback effect of the audio played by the laser projection device, including:

When the first azimuth angle and the second azimuth angle are within different azimuth angle ranges, change the display effect of the projection screen, and/or change the playback effect of the audio;

Wherein, the first azimuth angle is the azimuth angle of the target object at the first moment relative to the laser projection device; the second azimuth angle is the position of the target object at the second moment. Position relative to the azimuth of the laser projection device.
The method according to claim 7, characterized in that the projection picture includes: a video picture and an interactive picture, and the interactive picture is a picture obtained by the interaction between the target object and the laser projection device;

The emission detection signal includes:

During the process of projecting interactive images and video images to different locations on the projection screen, detection signals are emitted;

The changing the display effect of the projected image includes:

Change the display position of the interactive image on the projection screen.
The method of claim 8, wherein the projection screen includes multiple display areas, and the multiple display areas correspond to multiple azimuth angle ranges of the laser projection device; and the changing the interactive screen The display position on the projection screen includes:

If the changed azimuth angle is within the target azimuth angle range among the multiple azimuth angle ranges, the interactive screen is displayed in the target display area corresponding to the target azimuth angle range.
The method according to claim 9, wherein the plurality of display areas include a first display area and a second display area arranged sequentially along the longitudinal direction of the projection screen;

Projecting interactive images and video images to different locations on the projection screen includes:

Project the video screen to the first display area, and project the interactive screen to the second display area;

If the changed azimuth angle is within the target azimuth angle range among the multiple azimuth angle ranges, displaying the interactive screen in the target display area corresponding to the target azimuth angle range includes:

If the changed azimuth angle is within the target azimuth angle range corresponding to the first display area, the interactive picture is projected to the first display area, and the video picture is projected to the third display area. 2 within the display area.
The method according to claim 9, characterized in that the plurality of display areas are arranged sequentially along the longitudinal direction of the projection screen, and the size of each display area in the plurality of display areas is smaller than the size of the display area. The size of the projection screen;

Projecting interactive images and video images to different locations on the projection screen includes:

The video picture is projected to the projection screen, the interactive picture is projected to one of the plurality of display areas, and the interactive picture is superimposed on the video picture.
The method according to any one of claims 2, 9 to 11, characterized in that the interactive picture includes at least one of a posture picture of the target object, a video chat interface and a search interface.
The method according to any one of claims 1 to 12, characterized in that said transmitting a detection signal includes:

If it is detected that the human-computer interaction function has been turned on, a detection signal will be emitted.
The method of claim 13, further comprising:

If it is detected that the human-computer interaction function is not turned on, prompt information is displayed on the projection screen, and the prompt information is used to prompt that the human-computer interaction function is turned on.
A laser projection device, characterized in that the laser projection device is used for:

Emit detection signals;

Receive the first reflection signal reflected by the target at the first time and the second reflection signal reflected at the second time. The first reflection signal and the second reflection signal are generated by the target object reflecting the detection signal. signal of;

If it is determined that the position of the target object changes according to the first reflection signal and the second reflection signal, then the display effect of the projection screen of the laser projection device is changed according to the change parameter of the position of the target object. , and/or, change the playback effect of the audio played by the laser projection device.
The laser projection device according to claim 15, characterized in that the projection picture includes: at least one of a video picture and an interactive picture, and the interactive picture is obtained by the interaction between the target object and the laser projection device. picture.
The laser projection equipment according to claim 15 or 16, characterized in that the laser projection equipment is used for:

When the position after change and the position before change are within different detection ranges of the laser projection device, the display effect of the projection image is changed, and/or the playback effect of the audio is changed.
The laser projection equipment according to claim 15 or 16, characterized in that the laser projection equipment is used for:

When the first azimuth angle and the second azimuth angle are within different azimuth angle ranges, change the display effect of the projection screen, and/or change the playback effect of the audio;

Wherein, the first azimuth angle is the azimuth angle of the target object at the first moment relative to the laser projection device; the second azimuth angle is the position of the target object at the second moment. Position relative to the azimuth of the laser projection device.
The laser projection device according to claim 18, wherein the projection picture includes: a video picture and an interactive picture, and the interactive picture is a picture obtained by interaction between the target object and the laser projection device;

The laser projection equipment is used for:

During the process of projecting interactive images and video images to different locations on the projection screen, detection signals are emitted;

When changing the display effect of the projection screen, the display position of the interactive screen on the projection screen is changed.
A computer-readable storage medium, characterized in that instructions are stored in the computer-readable storage medium, and the instructions are loaded and executed by a processor to implement the laser projection device as claimed in any one of claims 1 to 14. Control Method.