Laser projection device and its prompting method

Abstract

Provided are a laser projection device and a prompting method thereof, the method comprising: if the laser projection device detects that a target position of a target object is within any threshold detection range, the laser projection device can generate a prompt picture according to the target position, and display the prompt picture on a main picture of a projection screen, the prompt picture comprising text information for indicating the target position of the target object and / or image information for identifying a relative position of the target object and the laser projection device, so that a user can timely move away from the projection screen under the prompting of the prompt picture to protect the user's eyes.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202011480448.X, filed on December 15, 2020, entitled "Laser Projection Device and Notification Method Thereof", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of projection display, and in particular to a laser projection device and its prompting method. Background Technology

[0004] Currently, laser projection devices emit lasers that project images onto a projection screen. However, because the lasers emitted by laser projection devices have high brightness, they may cause eye damage when the user is close to the projection screen. Summary of the Invention

[0005] In one aspect, this disclosure provides a prompting method for a laser projection device, the method comprising:

[0006] Receive the detection signal reflected by the target object at the first moment;

[0007] The target location of the target object is determined based on the detection signal;

[0008] If the target location is detected to be within any threshold detection range of at least one threshold detection range, a prompt screen is displayed on the main screen of the projection screen, and the playback state of the main screen remains unchanged.

[0009] The prompt screen includes text information and / or image information. The text information is used to indicate the target location of the target object, and the image information is used to identify the relative position of the target object and the laser projection device.

[0010] On the other hand, a laser projection device is provided, which is used for:

[0011] Receive the detection signal reflected by the target object at the first moment;

[0012] The target position of the target object is determined based on the detection signal, and if the target position is detected to be within any threshold detection range of at least one threshold detection range, a prompt screen is displayed on the main screen of the projection screen, and the playback state of the main screen remains unchanged.

[0013] The prompt screen includes text information and / or image information. The text information includes the target location of the target object, and the image information is used to identify the relative position of the target object and the laser projection device. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of a laser projection device provided in an embodiment of this disclosure;

[0016] Figure 2 This is a schematic diagram of another laser projection device provided in an embodiment of this disclosure;

[0017] Figure 3 This is a schematic diagram of the structure of another laser projection device provided in the embodiments of this disclosure;

[0018] Figure 4 This is a schematic diagram of the structure of another laser projection device provided in the embodiments of this disclosure;

[0019] Figure 5 This is a flowchart of a prompting method for a laser projection device provided in an embodiment of this disclosure;

[0020] Figure 6 This is a schematic diagram of the target location of a target object provided in an embodiment of this disclosure;

[0021] Figure 7 This is a schematic diagram illustrating the target distance between a target object and a laser projection device according to an embodiment of this disclosure;

[0022] Figure 8 This is a schematic diagram of a prompt screen provided in an embodiment of this disclosure;

[0023] Figure 9 This is a flowchart of another prompting method for a laser projection device provided in this disclosure embodiment;

[0024] Figure 10 This is a schematic diagram illustrating the target distance between a target object and a laser projection device according to an embodiment of this disclosure;

[0025] Figure 11 This is a schematic diagram of another prompt screen provided in an embodiment of this disclosure;

[0026] Figure 12This is a schematic diagram of another prompt screen provided in an embodiment of this disclosure;

[0027] Figure 13 This is a schematic diagram of another prompt screen provided in an embodiment of this disclosure;

[0028] Figure 14 This is a schematic diagram of yet another prompt screen provided in an embodiment of this disclosure;

[0029] Figure 15 This is a schematic diagram of another laser projection device provided in an embodiment of this disclosure;

[0030] Figure 16 This is a schematic diagram of the structure of another laser projection device provided in the embodiments of this disclosure;

[0031] Figure 17 This is a schematic diagram of the structure of another laser projection device provided in the embodiments of this disclosure. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0033] Figure 1 This is a schematic diagram of the structure of a laser projection device provided in an embodiment of this disclosure. Figure 2 This is a schematic diagram of another laser projection device provided in an embodiment of this disclosure. Figure 1 and Figure 2 As shown, the laser projection device may include a housing 00, a detection device 10 disposed on the housing 00, and a main board 20, a display board 30, a light valve 40 and a projection lens 50 disposed inside the housing 00.

[0034] The motherboard 20 sends image signals to the display panel 30. The display panel 30 controls the light valve 40 to flip based on the image signals, so as to transmit the light beam illuminating the light valve 40 to the projection lens 50. The projection lens 50 projects the light beam onto the projection screen to display an image on the projection screen.

[0035] refer to Figure 2 The detection device 10 is used to transmit a detection signal and receive the detection signal reflected by the target object 001. The detection device 10 can also determine the target position of the target object 001 based on the detection signal reflected by the target object 001 and send the target position to the motherboard 20. Alternatively, the detection device 10 can send the detection signal to the motherboard 20 so that the motherboard 20 can determine the target position of the target object 001 based on the received detection signal.

[0036] Among them, reference Figure 3The detection device 10 is located on the side of the housing 00 away from the projection screen 60, or the detection device 10 is located on the side of the housing 00 that intersects with the projection screen 60.

[0037] The target object 001 can be a person or animal located within the detection range of the detection device 10. (Reference) Figure 1 The detection device 10 has a first detection angle α1 in the first plane that is greater than 0 and less than 150 degrees. (Reference) Figure 3 and Figure 4 The detection device 10 has a second detection angle α2 in the second plane that is greater than 0 and less than 110 degrees. In one embodiment, the detection angle refers to the angle that the detection device 10 can detect. The first plane is parallel to the bearing surface of the laser projection device, and the second plane is perpendicular to the first plane.

[0038] Figure 5 This is a flowchart illustrating a prompting method for a laser projection device according to an embodiment of this disclosure. This prompting method can be applied to… Figures 1 to 4 In any of the laser projection devices shown. For example... Figure 5 As shown, the method may include:

[0039] Step 501: Receive the detection signal reflected by the target object at the first moment.

[0040] Laser projection equipment can transmit detection signals in real time and receive detection signals reflected by the target object in real time. (Reference) Figure 2 The target object 001 can be a person or animal located within the detection range of the detection device 10.

[0041] Step 502: Determine the target position of the target object based on the detection signal.

[0042] In one embodiment, the target location may include the target distance d between the target object 001 and the laser projection device, or it may be the target distance d between the target object 001 and the laser projection device and the azimuth angle β of the target object 001.

[0043] refer to Figure 6The laser projection device can establish a coordinate system with the location of the detection device 10 as the origin. This coordinate system can include a horizontal axis (X) and a vertical axis (Y). If the detection device 10 is a millimeter-wave sensor, the detection signal is a millimeter-wave signal. The laser projection device can determine the difference signal based on the detection signal received at the first moment, and determine the target distance d between the target object 001 and the detection device 10 based on the peak frequency of the difference signal. Furthermore, the laser projection device can determine the azimuth angle β of the target object 001 based on the difference in phase angles between two adjacent difference signals. Here, the azimuth angle β is the angle between the line connecting the target object 001 and the origin of the XY coordinate system and the horizontal axis (X). For example, refer to... Figure 7 The target distance d between the target object 001 and the laser projection device can be 1 meter (m).

[0044] Step 503: If the target position is detected to be within any of the preset threshold detection ranges, a prompt screen is displayed on the main screen of the projection screen, and the playback state of the main screen remains unchanged.

[0045] The prompt screen may include text information and / or image information. The text information is used to indicate the target location of the target object 001, and the image information is used to identify the relative position of the target object 001 and the laser projection device.

[0046] The laser projection device stores at least one threshold detection range. Different threshold detection ranges correspond to different detection distances and / or detection angles. The detection distance is the distance between the target object 001 and the detection device 10, and the detection angle is the angle between the target object 001 and the detection device 10.

[0047] In one implementation, the detection angle corresponding to each threshold detection range in the first plane is less than or equal to the first detection angle α1, and the detection angle in the second plane is less than or equal to the second detection angle α2.

[0048] Figure 8 This is a schematic diagram illustrating the display of a prompt screen on the main screen of a projection screen, provided by an embodiment of this disclosure. For example... Figure 8 As shown, the projected image may include a prompt screen 70 and a main screen 71. The prompt screen 70 may include text information 710 and image information 720. The text information 710 may be "Your current distance from the laser projection device is 1m. Please move away from the laser projection device." The image information 720 is used to identify the relative position between the target object 001 and the laser projection device.

[0049] In summary, this disclosure provides a prompting method for a laser projection device. In this method, if the laser projection device detects that the target position of an object is within any threshold detection range, it can generate a prompting screen based on the target position and display it on the main screen of the projection screen. Since the prompting screen includes text information indicating the target position of the object and / or image information identifying the relative position of the object and the laser projection device, the object can intuitively see its relative position to the laser projection device, improving the flexibility of the prompting. Simultaneously, it allows the user to promptly move away from the projection screen upon receiving the prompting screen, thus protecting the user's eyes.

[0050] Figure 9 This is a flowchart illustrating another prompting method for a laser projection device provided in an embodiment of this disclosure. This prompting method can be applied to… Figures 1 to 4 In any of the laser projection devices shown. For example... Figure 9 As shown, the method may include:

[0051] Step 901: Receive the detection signal reflected by the target object at the first moment.

[0052] Laser projection equipment can transmit detection signals in real time and receive the detection signals reflected by the target object 001 in real time. (Reference) Figure 2 The target object 001 can be a person or animal located within the detection range of the detection device 10.

[0053] Step 902: Determine the target position of the target object based on the detection signal.

[0054] In one embodiment, the target location may include the target distance d between the target object 001 and the laser projection device and the azimuth angle β of the target object 001.

[0055] refer to Figure 6 The laser projection device can establish a coordinate system with the location of the detection device 10 as the origin. This coordinate system can include a horizontal axis (X) and a vertical axis (Y). If the detection device 10 can be a millimeter-wave sensor, the detection signal can be a millimeter-wave signal. The laser projection device can determine the difference signal based on the detection signal received at the first moment, and determine the target distance d between the target object 001 and the detection device 10 based on the peak frequency of the difference signal. Furthermore, the laser projection device can determine the azimuth angle β of the target object 001 based on the difference in phase angles between two adjacent difference signals. Here, the azimuth angle β is the angle between the line connecting the target object 001 and the origin of the XY coordinate system and the horizontal axis (X). For example, refer to... Figure 7 The target distance d between the target object 001 and the laser projection device can be 1 meter (m).

[0056] Step 903: Detect whether the target location is within any threshold detection range of at least one threshold detection range.

[0057] After determining the target position of the object, the laser projection device can detect whether the target position is within any threshold detection range of at least one threshold detection range. If the target position is detected to be within any threshold detection range, step 904 is executed. If the target position is detected not to be within any threshold detection range, step 901 is executed.

[0058] In one implementation, if the laser projection device determines that the target distance d is less than or equal to a distance threshold, it can determine that the target position of the target object 001 is within any threshold detection range. For example, the distance threshold can be 1m.

[0059] The laser projection device stores at least one threshold detection range. Different threshold detection ranges correspond to different detection distances and / or detection angles. The detection distance is the distance between the target object 001 and the laser projection device, and the detection angle is the angle between the target object 001 and the laser projection device.

[0060] In one implementation, the detection angle corresponding to each threshold detection range in the first plane is less than or equal to the first detection angle, and the detection angle in the second plane is less than or equal to the second detection angle.

[0061] Step 904: Display a prompt screen on the main screen of the projection screen, and keep the main screen in the playback state unchanged.

[0062] If the laser projection device determines that the target location is within any threshold detection range, it can display a prompt on the main screen of the projection screen and keep the main screen playback status unchanged.

[0063] The prompt screen may include text information and / or image information. The text information is used to indicate the target location of the target object 001, and the image information is used to identify the relative position of the target object 001 and the laser projection device.

[0064] Figure 8 This is a schematic diagram illustrating the display of a prompt screen on the main screen of a projection screen, provided by an embodiment of this disclosure. For example... Figure 8 As shown, the projected image may include a prompt screen 70 and a main screen 71. The prompt screen 70 may include text information 710 and image information 720. The text information 710 may be "Your current distance from the laser projection device is 1m. Please move away from the laser projection device." The image information 720 is used to identify the relative position between the target object 001 and the laser projection device.

[0065] Step 905: Receive the detection signal reflected by the target object at the second moment.

[0066] Laser projection equipment can transmit detection signals in real time and receive detection signals reflected by the target object in real time.

[0067] Step 906: Detect whether the target position of the target object has changed based on the received detection signal.

[0068] The laser projection device can compare the target position determined based on the detection signal reflected by the target object at a second moment with the target position determined based on the detection signal reflected by the target object at a first moment. If they are the same, the laser projection device can determine that the target position of the target object has changed, and then proceed to step 907. If they are different, the laser projection device can determine that the target position of the target object has changed, and then proceed to step 904.

[0069] In one embodiment, the laser projection device can detect whether the target distance d changes and whether the azimuth angle β of the target object 001 changes. If a change in the target distance d is detected, and / or a change in the azimuth angle β of the target object 001 is detected, the laser projection device can determine that the target position of the target object has changed. If no change in the target distance d is detected, and no change in the azimuth angle β of the target object 001 is detected, the laser projection device can determine that the target position of the target object has changed.

[0070] In one embodiment, the laser projection device can detect whether the target distance d determined at a first time moment is the same as the target distance d determined at a second time moment. If they are different, the laser projection device can determine that the target distance d has changed. If they are the same, the laser projection device can determine that the target distance d has not changed.

[0071] Similarly, the laser projection device can detect whether the azimuth angle β of the target object 001 determined at the first moment is the same as that determined at the second moment. If they are different, the laser projection device can determine that the azimuth angle β of the target object 001 has changed. If they are the same, the laser projection device can determine that the azimuth angle β of the target object 001 has not changed.

[0072] Step 907: Detect whether the changed target position is within any threshold detection range.

[0073] If the laser projection device determines that the changed target position is within any threshold detection range, it can proceed to step 908. If it determines that the changed target position is not within any threshold detection range, it can proceed to step 909.

[0074] Step 908: Update the prompt screen according to the changed target position.

[0075] If the laser projection device determines that the target position of the target object has changed, and the changed target position is within any threshold detection range, the prompt screen can be updated according to the changed target position.

[0076] refer to Figure 7 and Figure 10 If the target distance d determined at the first moment is 1m, and the target distance determined at the second moment is 0.5m, then since the target distance of 1m is equal to the distance threshold of 1m, the target distance of 0.5m is less than the distance threshold of 1m, and the target distance of 1m is not equal to the target distance of 0.5m, the laser projection device can determine that the target position of the target object 001 has changed, and the target position is still within any threshold detection range. Therefore, the laser projection device can update the prompt screen 70, for example, showing... Figure 8 The text message 710 shown has been updated from "Your current distance from the laser projection device is 1m, please move away from the laser projection device" to the following: Figure 11 The message "Your current distance from the laser projection device is 0.5m. Please move away from the laser projection device" is displayed, and image information 720 is updated.

[0077] In this embodiment of the present disclosure, if the laser projection device detects that the target distance d between the target object 001 and the laser projection device has shortened, it can shorten the distance between the target object 001 and the laser projection device in the image information 720. If the laser projection device detects that the target distance between the target object 001 and the laser projection device has lengthened, it can increase the distance between the target object 001 and the laser projection device in the image information 720.

[0078] After detecting a change in the target position of target object 001, if the laser projection device detects that the target distance d between target object 001 and the laser projection device has shortened, it can determine that the position of target object 001 at the second moment has moved towards the laser projection device relative to its position at the first moment. Therefore, the laser projection device can shorten the distance between target object 001 and the laser projection device in the image information 720, and simultaneously update the text information 710.

[0079] If the laser projection device detects that the target distance d between the target object 001 and the laser projection device has increased, it can determine that the position of the target object 001 at the second moment has moved away from the laser projection device relative to its position at the first moment. Therefore, the laser projection device can increase the distance between the target object 001 and the laser projection device in the image information 720, and simultaneously update the text information 710.

[0080] In one embodiment, the laser projection device can compare the target distance d determined at a second time moment with the target distance d determined at a first time moment. If the target distance d determined at the second time moment is detected to be greater than the target distance d determined at the first time moment, the laser projection device can determine that the target distance d between the target object 001 and the laser projection device has increased. If the target distance d determined at the second time moment is detected to be less than the target distance d determined at the first time moment, the laser projection device can determine that the target distance d between the target object 001 and the laser projection device has decreased.

[0081] In this embodiment of the disclosure, the at least one threshold detection range may include multiple threshold detection ranges, and the image information 720 may include multiple threshold marker lines corresponding one-to-one with the multiple threshold detection ranges. The display effect of the target threshold marker line corresponding to the threshold detection range where the target position is located is different from the display effect of the other threshold marker lines.

[0082] In one implementation, the target threshold marker line can be displayed in a first color, and the other threshold marker lines can be displayed in a second color, wherein the first color and the second color are different. Alternatively, the target threshold marker line can be displayed in a blinking manner, and the other threshold marker lines can be displayed without blinking. Alternatively, the target threshold marker line can be displayed as a solid line, and the other threshold marker lines can be displayed as dashed lines.

[0083] In one embodiment, the at least one threshold detection range may include a first threshold detection range and a second threshold detection range. Correspondingly, the image information 720 may include two threshold marker lines, namely a first threshold marker line 721 and a second threshold marker line 722.

[0084] Wherein, the first threshold marker line 721 corresponds to the first threshold detection range, and the second threshold marker line 722 corresponds to the second threshold detection range. The upper limit of the detection distance corresponding to the first threshold detection range is less than or equal to the distance threshold, and the lower limit of the detection distance corresponding to the first threshold detection range is greater than the upper limit of the detection distance corresponding to the second threshold detection range. The upper limit of the detection distance corresponding to the first threshold detection range can be 1m, and the lower limit can be greater than 0.5m; the upper limit of the detection distance corresponding to the second threshold detection range can be 0.5m, and the lower limit can be greater than 0.

[0085] If the target distance is 1m, the laser projection device can determine that the target location falls within the threshold detection range as the first threshold detection range, and the target threshold marker line corresponding to this first threshold detection range is the first threshold marker line 721. (Reference) Figure 12 The first threshold marker line 721 is displayed as a solid line, and the second threshold marker line 722 is displayed as a dashed line.

[0086] refer to Figure 13 The image information 720 may include a first sub-image 723 for indicating the target object 001, a second sub-image 724 for indicating the laser projection device, and a distance marker line 725 located between the first sub-image 723 and the second sub-image 724. The distance marker line 725 is used to identify the target distance d between the target object 001 and the laser projection device.

[0087] refer to Figure 14 Above the distance marker line 725, the target distance d between the target object 001 and the laser projection device can be displayed, where d = 0.5m.

[0088] By displaying the distance marker line 725, users can intuitively see the distance between themselves and the laser projection device, as well as the changes in that distance, thus effectively providing guidance to the user.

[0089] This text message 710 is also used to instruct the user to adjust the brightness of the main screen after the target duration. (Reference) Figure 14 The text message 710 could be: "Your current distance from the laser projection device is 0.5m. To protect your eyes, the projection screen will be turned off in 5 seconds."

[0090] In one implementation, the laser projection device can start timing after displaying text information indicating that the brightness of the main screen will be adjusted after the target duration of the prompt screen is displayed, and update the prompt screen in real time. When the timed duration equals the target duration, the brightness of the main screen is adjusted. For example, the target duration can be 5 seconds (s).

[0091] For example, if the target duration is 5 seconds, the text message 710 displayed on the projection screen by the laser projection device will be a prompt message stating, "Your current distance from the laser projection device is 0.5m. To protect your eyes, the projection screen will be turned off in 5 seconds." If the timeout duration is 1 second, the laser projection device can project the prompt message displayed on the screen. This updated prompt message includes the text message, "Your current distance from the laser projection device is 0.5m. To protect your eyes, the projection screen will be turned off in 4 seconds." The laser projection device will adjust the brightness of the main image on the projected screen until the timeout duration reaches 5 seconds.

[0092] Step 909: Cancel the display of the prompt screen.

[0093] If the laser projection device determines that the target position has changed, and the changed target position is not within any threshold range, then it can be determined that the target distance between the target and the laser projection device is large. In this case, the laser emitted by the laser projection device will not cause harm to the human eye, so the display of the prompt screen 70 can be canceled. Alternatively, the laser projection device can cancel sending the prompt screen 70 to the display panel 30 after the duration of displaying the prompt screen 70 has reached the target duration.

[0094] Step 910: After the display duration of the prompt screen reaches the target duration, adjust the brightness of the main screen.

[0095] Laser projection equipment can adjust the brightness of the main screen after the target duration of the displayed prompt screen has been reached.

[0096] In one implementation, if the laser projection device detects that the target position is within a first threshold detection range, it can adjust the brightness of the main screen to a first brightness corresponding to the first threshold detection range. If the laser projection device detects that the target position is within a second threshold detection range, it can adjust the brightness of the main screen to a second brightness corresponding to the second threshold detection range. The first brightness is greater than the second brightness.

[0097] For example, the first brightness can be 50% of the original brightness, and the second brightness can be 0. The original brightness can be the brightness of the main screen when the laser projection device is displaying the image normally.

[0098] If the laser projection device detects that the target position is within the first threshold detection range, it can determine that the brightness of the main screen is less harmful to the human eye. At this time, the laser projection device can reduce the brightness of the main screen to 50% of the original brightness, thereby protecting the human eye while ensuring that the user can watch the video normally.

[0099] If the laser projection device detects that the target position is within the second threshold detection range, it can determine that the brightness of the main screen is harmful to the human eye. At this time, the laser projection device can reduce the brightness of the main screen to 0.

[0100] In this embodiment of the disclosure, the laser projection device pre-stores the correspondence between threshold detection range and brightness. After the duration of displaying the prompt screen 70 reaches the target duration, the laser projection device can determine the brightness corresponding to the threshold detection range of the target position from the correspondence between the threshold detection range and brightness.

[0101] For example, assuming the correspondence between detection distance and brightness corresponding to the threshold detection range is shown in Table 1, referring to Table 1, if the target distance d is 0.5m, it can be determined from Table 1 that this target distance of 0.5m is within the detection distance corresponding to the second threshold detection range. If the second brightness corresponding to this second threshold detection range is 0, then the laser projection device can adjust the brightness of the main screen to 0, i.e., turn off the projection screen 60.

[0102] Table 1

[0103] Detection distance brightness [0，0.5m] 0 (0.5m, 1m) 50% of the original brightness

[0104] Laser projection equipment can determine the target brightness corresponding to the threshold detection range of the target location based on the target location, thereby dynamically adjusting the brightness of the main screen and improving the flexibility of eye protection. For example, after adjusting the brightness of the main screen to 0, if the detected target location is within the first threshold detection range, the brightness of the main screen can be restored to 50% of the original brightness.

[0105] Once the laser projection device detects that the target distance d is greater than the distance threshold, it can restore the brightness of the main screen to its original brightness. At the same time, there is no need to generate a prompt screen 70 based on the target position of object 001.

[0106] In one embodiment, the laser projection device may pre-store a correspondence between threshold detection ranges and durations. After determining the threshold detection range in which the target location is located, the laser projection device can determine the target duration corresponding to the threshold detection range in which the target location is located from the correspondence between threshold detection ranges and durations. The target duration is positively correlated with the upper limit of the detection distance of the threshold detection range; that is, the smaller the upper limit of the detection distance of the threshold detection range, the shorter the target duration; and the larger the upper limit of the detection distance of the threshold detection range, the longer the target duration.

[0107] In this embodiment of the present disclosure, during the process of displaying the prompt screen by the laser projection device, the prompt screen 70 can be displayed at the corresponding position on the projection screen 60 according to the pre-stored display position of the prompt screen 70 on the main screen.

[0108] The prompt screen 60 can be a quadrilateral, and the display position can include the position of each vertex of the prompt screen 60 on the projected image. Alternatively, the display position can include the position of a vertex of the prompt screen 70 (e.g., the top left vertex) on the projected image and the resolution of the prompt screen 70.

[0109] Since the resolution of the projected image, the resolution of the projection screen, and the number of lenses included in the light valve of the laser projection device are all the same, each lens corresponds to a pixel in the projected image. The laser projection device can control the corresponding lens to flip based on the pixel value of each pixel, thereby projecting the image onto the corresponding position on the projection screen 60. Therefore, the laser projection device can determine the lens corresponding to each pixel in the prompt screen 70 based on the position of a vertex in the main image and the resolution of the prompt screen 70. It then controls the corresponding lens to deflect based on the pixels in the prompt screen 70, thereby displaying the prompt screen 70 at the corresponding position on the projection screen 60.

[0110] Example, reference Figure 14 If the lower right corner of the prompt screen 70 coincides with the lower right corner of the projected image, then the display position of the lower right corner of the prompt screen 70 on the projection screen 60 coincides with the lower right corner of the projection screen 60.

[0111] In this embodiment of the present disclosure, during the process of generating a prompt image based on the target position, the laser projection device can determine the display distance L1 between the first sub-image 723 and the second sub-image 724 in the image information based on the distance threshold D, the display distance threshold L0, and the target distance d between the target object 001 and the laser projection device. The display distance L1 is used to identify the target distance d between the target object 001 and the laser projection device.

[0112] The display distance threshold L0 is a fixed value pre-stored in the laser projection device. The distance threshold D is the maximum distance corresponding to the display prompt screen 70. That is, if the target distance d is greater than the distance threshold D, the laser projection device does not need to generate the prompt screen 70. The display distance threshold L0 is the maximum display distance corresponding to the distance threshold D. Since both the distance threshold D and the display distance threshold L0 are fixed values, the display distance L1 is positively correlated with the target distance d. That is, the shorter the target distance d, the shorter the display distance L1; the longer the target distance d, the longer the display distance L1.

[0113] In this embodiment of the disclosure, during the generation of the prompt screen, the laser projection device can draw and render text and image information according to the target position to obtain the prompt screen. Simultaneously, the laser projection device can set the display priority of the prompt screen to a target value, so that the prompt screen is displayed first.

[0114] The laser projection device provided in this disclosure can display a prompt screen on the projection screen when a target object is determined to be within any threshold detection range. This allows the user to intuitively understand the distance between the target object and the laser projection device, as well as its relative position, thus improving the flexibility of the prompts. Simultaneously, the motherboard can update the prompt screen promptly when the target position changes, ensuring that the relative positions of the first and second sub-images in the image information change with the target object's position.

[0115] It should be noted that the order of the prompting steps of the laser projection device provided in this embodiment can be appropriately adjusted, and steps can also be deleted as needed. For example, step 909 can be deleted, or step 910 can be deleted, or steps 905 to 910 can all be deleted as needed. Any variations that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the protection scope of this disclosure, and therefore will not be elaborated further.

[0116] In summary, this disclosure provides a prompting method for a laser projection device. In this method, if the laser projection device detects that the target position of an object is within any threshold detection range, it can generate a prompting screen based on the target position and display the prompting screen on the main screen of the projection screen. Since the prompting screen includes text information indicating the target position of the object and / or image information identifying the relative position of the object and the laser projection device, the object can intuitively see its relative position to the laser projection device, improving the flexibility of the prompting. Simultaneously, it allows the user to promptly move away from the projection screen upon receiving the prompting screen, thus protecting the user's eyes.

[0117] In this embodiment of the disclosure, steps 901 to 910 can all be executed by the motherboard 20, or steps 901, 902 and 905 can be executed by the detection device 10, and steps 903, 904 and steps 906 to 910 can be executed by the motherboard 20. This embodiment of the disclosure does not limit the scope of the disclosure.

[0118] refer to Figures 1 to 4 This disclosure provides a laser projection device, which is used for:

[0119] The system receives the detection signal reflected by the target object at the first moment. Based on the detection signal, the target position of the target object is determined. If the target position is detected to be within any threshold detection range of at least one threshold detection range, a prompt image is displayed on the main screen of the projection screen, and the playback state of the main screen remains unchanged.

[0120] The prompt screen may include text information and / or image information. The text information may include the target location of the target object, and the image information is used to identify the relative position of the target object and the laser projection device.

[0121] In summary, this disclosure provides a laser projection device. If the laser projection device detects that the target position of an object is within any threshold detection range, it can generate a prompt screen based on the target position and display the prompt screen on the main screen of the projection screen. Since the prompt screen includes text information indicating the target position of the object and / or image information identifying the relative position of the object and the laser projection device, the object can intuitively see its relative position to the laser projection device, improving the flexibility of the prompt. Simultaneously, it allows the user to promptly move away from the projection screen upon receiving the prompt, thus protecting the user's eyes.

[0122] In one embodiment, the laser projection device is further configured to receive a detection signal reflected by the target object at a second moment, and if it is determined from the received detection signal that the target position of the target object has changed, then the prompt screen is updated according to the changed target position.

[0123] In one embodiment, at least one threshold detection range includes multiple threshold detection ranges; the image information includes multiple threshold marker lines that correspond one-to-one with the multiple threshold detection ranges, and the display effect of the target threshold marker line among the multiple threshold marker lines is different from the display effect of the other threshold marker lines, wherein the target threshold marker line is the threshold marker line corresponding to the threshold detection range where the target position is located.

[0124] In one embodiment, the image information includes: a first sub-image for indicating a target object, a second sub-image for indicating a laser projection device, and a distance marker line located between the first sub-image and the second sub-image.

[0125] Among them, the distance marking line is used to indicate the target distance between the target object and the laser projection device.

[0126] The laser projection device is also used to adjust the brightness of the main screen after the display of the prompt screen has reached the target duration.

[0127] In one embodiment, the laser projection device is also used to cancel the display of the prompt screen after the display duration of the prompt screen has reached the target duration.

[0128] In one implementation, the text information is also used to instruct the brightness of the main screen to be adjusted after a target duration.

[0129] In this embodiment, the detection device 10 is used to transmit a detection signal and receive the detection signal reflected by the target object 001. The following description uses the detection device 10 to determine the target position of the target object 001 as an example. (Refer to...) Figure 2 The detection device 10 is connected to the motherboard 20. When the motherboard 20 needs to obtain the target location, it can send a location acquisition request to the detection device 10. After receiving the location acquisition request, the detection device 10 can send the target location of the target object 001 to the motherboard 20. Alternatively, after determining the target location of the target object, the detection device 10 can directly send the target location to the motherboard 20.

[0130] Or, refer to Figure 15 The laser projection device may also include a display panel 30 disposed within the housing 00, which is also connected to the detection device 10. When the motherboard 20 needs to acquire a target position, it can send a position acquisition request to the display panel 30, which can then send the request to the detection device 10. Upon receiving the position acquisition request, the detection device 10 can send the target position of the target object 001 to the display panel 30, which can then send the target position to the motherboard 20. Alternatively, after determining the target position of the target object 001, the detection device 10 can directly send the target position to the display panel 30, which can then send the target position to the motherboard 20.

[0131] refer to Figure 15 The display panel 30 is also used to control the flipping of the light valve 40 to transmit the light beam illuminating the light valve 40 to the projection lens 50.

[0132] The display panel 30 generates a light valve control signal based on the pixel values ​​of the pixels in the main screen and the prompt screen, and controls the light valve 40 to flip according to the light valve control signal. The flipped light valve 40 is used to transmit the light beam illuminating its surface to the projection lens 50.

[0133] The projection lens 50 is used to project a beam of light to display the main screen and prompt screen.

[0134] refer to Figure 3 The projection lens 50 is used to project the light beam transmitted by the light valve 40 onto the projection screen 60, so as to project and display the main screen and prompt screen on the projection screen 60.

[0135] When adjusting the brightness of the main screen, refer to Figure 16 and Figure 17The laser projection device may also include a laser light source 80 and a light source driving component 90. The light source driving component 90 is connected to the laser light source 80 and the display panel 30 respectively. The display panel 30 can adjust the brightness of the laser light source 80 by controlling the light source driving component 90, so as to adjust the brightness of the projected image.

[0136] When adjusting the brightness of the main screen, the motherboard 20 can send the brightness corresponding to the threshold detection range of the target position to the display panel 30. The display panel 30 can determine the target current control signal corresponding to the brightness within the threshold detection range of the target position based on the brightness-current control signal correspondence from the relationship between brightness and current control signals, and then send the determined target current control signal to the light source driving component 90. The light source driving component 90 can respond to the target current control signal by sending a driving current to the laser light source 80, which emits light under the control of the driving current, thereby adjusting the brightness of the main screen.

[0137] In the relationship between brightness and current control signal, brightness is positively correlated with the duty cycle of the current control signal. That is, the lower the brightness, the smaller the duty cycle of the current control signal, and correspondingly, the smaller the driving current; the higher the brightness, the larger the duty cycle of the current control signal, and correspondingly, the larger the driving current.

[0138] In summary, this disclosure provides a laser projection device. If the laser projection device detects that the target position of an object is within any threshold detection range, it can generate a prompt screen based on the target position and display the prompt screen on the main screen of the projection screen. Since the prompt screen includes text information indicating the target position of the object and / or image information identifying the relative position of the object and the laser projection device, the object can intuitively see its relative position to the laser projection device, improving the flexibility of the prompt. Simultaneously, it allows the user to promptly move away from the projection screen upon receiving the prompt, thus protecting the user's eyes.

[0139] This disclosure provides a laser projection device, including a memory, a processor, and a computer program stored in the memory. When the processor executes the computer program, it implements the method embodiments described above (e.g., Figure 5 or Figure 9 The steps performed by the motherboard in the illustrated embodiment.

[0140] This disclosure provides a computer-readable storage medium storing instructions that are loaded and executed by a processor to implement the method embodiments described above (e.g., ...). Figure 5 or Figure 9 The steps performed by the motherboard in the illustrated embodiment.

[0141] This disclosure provides a computer program product containing instructions that, when run on a computer, cause the computer to perform the methods described above (e.g., ...). Figure 5 or Figure 9 The steps performed by the motherboard in the illustrated embodiment.

[0142] In this disclosure, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "and / or" in this disclosure is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The term "multiple" in this disclosure means two or more.

[0143] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A laser projection device, characterized in that, include: case; A detection device configured to emit a detection signal and receive a detection signal reflected by a target object; A projection screen is configured to receive a projection beam to display a projected image. Motherboard and display board, The motherboard and display board are used for: The target position of the target object is determined based on the detection signal received by the detection device at the first moment; Furthermore, if it is determined that the target position of the target object is within a threshold range, a prompt screen is displayed on the main screen of the projection screen, the main screen is adjusted after the target display duration of the prompt screen is controlled, and at least one of the image content or audio content corresponding to the projected image is adjusted; Wherein, the target position is the position of the target object relative to the laser projection device, the projected image is a display image formed by superimposing the main image and the prompt image, the main image is the main image displayed by the laser projection device on the projection screen to display the main content of the projected image; The prompt screen includes first information and second information, or the prompt screen includes second information, where the first information is text information and the second information is image information, so that the second information displays the change in the relative position between the target object and the laser projection device through an image; The first information is configured to display the target location of the target object via text, and the second information includes: The first sub-image indicates the target object; A second sub-image, indicating the laser projection device; and a distance marker line, located between the first sub-image and the second sub-image, the distance marker line being configured to indicate the target distance between the target object and the laser projection device; The motherboard is also used to update the prompt screen when the target position changes, so that the relative positions of the first sub-image and the second sub-image in the image information change with the target position of the target object.

2. The laser projection device according to claim 1, characterized in that, The display panel is also used for: If the detection device determines, based on the detection signal received at the second moment, that the target position of the target object is within the threshold range, and the display duration of the prompt screen is less than the target duration, then the prompt screen is updated. If the target position of the target object is determined to be within the threshold range based on the detection signal received by the detection device at the second moment, and the display duration of the prompt screen reaches the target duration, the projection image is canceled from display. as well as If the detection signal received by the detection device at the second moment determines that the target position of the target object is outside the threshold range, the prompt screen will be canceled.

3. The laser projection device according to claim 1, characterized in that, When the main screen is adjusted after the prompt screen displays the target duration, the display panel is configured as follows: Adjust the brightness of the main screen; or, adjust the brightness of either the main screen or the notification screen.

4. The laser projection device according to claim 3, characterized in that, Also includes: The laser source is configured to emit an illumination beam; A light valve is configured to receive the illumination beam and modulate the illumination beam into the projection beam; A projection lens is configured to receive the projection beam and project the projection beam onto the projection screen to display the projected image; as well as A light source driving component is electrically connected to the laser light source and the display panel respectively. The light source driving component is configured to adjust the brightness of the illumination beam emitted by the laser light source under the control of the display panel, so as to adjust the brightness of the main screen; or, to adjust the brightness of the main screen and the prompt screen.

5. The laser projection device according to claim 1, characterized in that, The detection device is located on the side of the housing away from the projection screen; or, The detection device is located on the surface of the housing that intersects with the projection screen.

6. The laser projection device according to claim 1, characterized in that, The motherboard is disposed within the housing and is electrically connected to the detection device; and The display panel is disposed inside the housing and is electrically connected to the motherboard; The detection device satisfies one of the following: (1) The detection device is further configured to determine the target position of the target object based on the emitted detection signal and the received detection signal, and send the target position to the motherboard; (2) The detection device is further configured to send the received detection signal to the motherboard so that the motherboard determines the target position of the target object based on the received detection signal; or, The motherboard is disposed within the housing; and The display panel is disposed inside the housing and is electrically connected to the motherboard and the detection device; The detection device satisfies one of the following: (1) The detection device is further configured to determine the target position of the target object based on the emitted detection signal and the received detection signal, and to send the target position to the motherboard through the display panel; (2) The detection device is further configured to send the received detection signal to the motherboard through the display panel, so that the motherboard can determine the target position of the target object based on the received detection signal.

7. A method for operating a laser projection device, characterized in that, The laser projection device includes a detection device and a projection screen. The detection device is configured to emit a detection signal and receive a detection signal reflected by a target object. The projection screen is configured to receive a projection beam to display a projected image. The method includes: Receive the detection signal reflected by the target object at the first moment; The target position of the target object is determined based on the reflected detection signal; If the target position of the target object is determined to be within at least one threshold range, a prompt screen is displayed on the main screen of the projection screen, while keeping the running state of the image content and the playback state of the audio content corresponding to the main screen unchanged; Wherein, the target position is the position of the target object relative to the laser projection device, the projected image is a display screen formed by superimposing the main screen and the prompt screen, the main screen is the main screen displayed by the laser projection device on the projection screen to display the main content of the projected image; the prompt screen includes at least one of a first information or a second information, the first information is text information, and the second information is image information, so that the second information displays the change in the relative position between the target object and the laser projection device or the change in at least one target duration through the image; The first information is configured to display the target location of the target object via text, and the second information includes: The first sub-image indicates the target object; A second sub-image, indicating the laser projection device; and a distance marker line, located between the first sub-image and the second sub-image, the distance marker line being configured to indicate the target distance between the target object and the laser projection device; Furthermore, the method further includes: Receive the detection signal reflected by the target object at a second moment; If, based on the detection signal received at the second time, it is determined that the target position of the target object has changed, and the changed target position is within the threshold range, then the prompt screen is updated according to the changed target position, specifically including: If it is determined that the target distance of the target object has shortened, the display distance between the image of the target object in the second information and the image of the laser projection device is shortened; If it is determined that the target distance of the target object increases, the display distance between the image of the target object in the second information and the image of the laser projection device is increased.

8. The method according to claim 7, characterized in that, Also includes: Receive the detection signal reflected by the target object at a second moment; If, based on the detection signal received at the second moment, it is determined that the target position of the target object has changed, and the changed target position is outside the threshold range, the prompt screen will be canceled.

9. The method according to claim 8, characterized in that, The target position of the target object satisfies one of the following: the target position includes a target distance and a position angle; wherein the target distance is the distance between the target object and the laser projection device, and the position angle is the angle of the target object relative to the laser projection device; The threshold range includes at least one of a distance range or an angle range, wherein the distance range corresponds to the target distance and the angle range corresponds to the position angle; The method satisfies one of the following: (1) When the target location includes the target distance, determining that the target location of the target object is within the threshold range includes: If the target distance is within the specified distance range, the target position of the target object is determined to be within the threshold range; (2) When the target location includes the target distance and the position angle, determining that the target location of the target object is within the threshold range includes: If the target distance is within the distance range and the position angle is within the angle range, the target position of the target object is determined to be within the threshold range.

10. The method according to claim 7, characterized in that, Also includes: If the display duration of the prompt screen reaches the target duration, the prompt screen will be canceled. or If the display duration of the prompt screen reaches the target duration, adjust the brightness of the main screen or the brightness of both the main screen and the prompt screen.

11. The method according to claim 7, characterized in that, The first information is configured to instruct the brightness of the main screen or the brightness of the main screen and the prompt screen to be adjusted after the target duration; The method further includes: After the prompt screen displays the information about adjusting the brightness of the main screen or the brightness of both the main screen and the prompt screen after the target duration has been reached, the timer begins. If the display duration of the prompt screen reaches the target duration, adjust the brightness of the main screen or the brightness of both the main screen and the prompt screen.

Images