Laser projection equipment and laser projection equipment display method

Abstract

The invention provides laser projection equipment and a laser projection equipment display method, and relates to the technical field of projection. The laser projection equipment can adjust the driving current of the laser light source corresponding to the at least one primary color of the projection picture after receiving the setting instruction for indicating to enter the shooting mode, so that the projection equipment enters the shooting mode, and the phenomenon of color cast of the picture shot by the shooting equipment can be effectively avoided.

Description

Laser projection device and laser projection device display method

[0001] The present disclosure claims priority to Chinese patent application No. 202310080853.X filed on January 19, 2023, entitled “Projection device and driving method of its light source”, and Chinese patent application No. 202310106583.5 filed on February 9, 2023, entitled “Projection device and driving method of its light source”, the entire contents of which are incorporated by reference into the present disclosure. Technical Field

[0002] The present disclosure relates to the field of projection technology, and in particular to a laser projection device and a laser projection device display method. Background Art

[0003] Laser projection devices (such as laser TVs and laser projectors) can project images. If a user wishes to record the image while the laser projection device is projecting, they can use a camera such as a mobile phone to capture the image. However, the color of the image captured by the camera can differ significantly from the color of the image projected by the laser projection device, resulting in a color cast in the captured image.

[0004] Summary of the Invention

[0005] The present disclosure provides a laser projection device and a laser projection device display method, which can solve the problem of color cast when a camera captures a projection image of a laser projection device in the related art. The technical solutions of the laser projection device and the laser projection device display method are as follows.

[0006] In a first aspect, the present disclosure provides a laser projection device display method, which is applied to a laser projection device, wherein the laser projection device includes a laser light source of multiple colors; the method includes: receiving a setting instruction indicating entering a shooting mode, wherein the shooting mode refers to a mode in which a projected picture of the laser projection device is provided for shooting by a shooting device; in response to the setting instruction, adjusting the driving current of the laser light source corresponding to at least one primary color of the projected picture.

[0007] In a second aspect, the present disclosure provides a laser projection device display method, which is applied to a laser projection device, wherein the laser projection device includes at least one laser light source; the method includes: displaying a current indication icon corresponding one-to-one to at least one laser light source in response to an icon display instruction, each current indication icon being used to indicate the driving current of the corresponding laser light source; receiving a current adjustment operation for a target laser light source in at least one laser light source; adjusting the driving current of the target laser light source based on the current adjustment operation, and updating the current indication icon corresponding to the target laser light source, the updated current indication icon being used to indicate the adjusted driving current of the target laser light source; and using the adjusted driving current to drive the target laser light source to emit light.

[0008] In a third aspect, the present disclosure provides a laser projection device, which includes laser light sources of multiple colors. The laser projection device is used to: receive a setting instruction indicating entering a shooting mode, wherein the shooting mode refers to a mode in which the projection screen of the laser projection device is provided for the shooting device to shoot; and in response to the setting instruction, adjust the driving current of the laser light source corresponding to at least one primary color of the projected screen.

[0009] In a fourth aspect, the present disclosure provides a laser projection device, which includes at least one laser light source, and the laser projection device is used to: display a current indication icon corresponding to the at least one laser light source in response to an icon display instruction, each current indication icon is used to indicate the driving current of the corresponding laser light source; receive a current adjustment operation for a target laser light source in the at least one laser light source; adjust the driving current of the target laser light source based on the current adjustment operation, and update the current indication icon corresponding to the target laser light source, the updated current indication icon is used to indicate the adjusted driving current of the target laser light source; and use the adjusted driving current to drive the target laser light source to emit light. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG1 is a schematic structural diagram of a laser projection device provided by an embodiment of the present disclosure;

[0011] FIG2 is a schematic structural diagram of a second laser projection device provided by an embodiment of the present disclosure;

[0012] FIG3 is a schematic structural diagram of a third laser projection device provided by an embodiment of the present disclosure;

[0013] FIG4 is a flow chart of a first laser projection device display method provided by an embodiment of the present disclosure;

[0014] FIG5 is a flow chart of a second laser projection device display method provided by an embodiment of the present disclosure;

[0015] FIG6 is a schematic diagram of an implementation environment involved in the laser projection device display method provided in an embodiment of the present disclosure;

[0016] FIG7 is a schematic diagram of a current adjustment interface provided by an embodiment of the present disclosure;

[0017] FIG8 is a schematic diagram of another current adjustment interface provided by an embodiment of the present disclosure;

[0018] FIG9 is a flow chart of a third laser projection device display method provided by an embodiment of the present disclosure;

[0019] FIG10 is a schematic structural diagram of a fourth laser projection device provided by an embodiment of the present disclosure;

[0020] FIG11 is a schematic structural diagram of a fifth laser projection device provided by an embodiment of the present disclosure;

[0021] FIG12 is a flowchart of a fourth laser projection device display method provided by an embodiment of the present disclosure;

[0022] FIG13 is a flowchart of a fifth laser projection device display method provided by an embodiment of the present disclosure;

[0023] FIG14 is a schematic structural diagram of a radar provided by an embodiment of the present disclosure;

[0024] FIG15 is a schematic diagram showing how the amplitude of a detection signal varies with time, provided by an embodiment of the present disclosure;

[0025] FIG16 is a schematic diagram showing how the frequency of a detection signal varies with time, provided by an embodiment of the present disclosure;

[0026] FIG17 is a schematic diagram of an intermediate frequency signal obtained by mixing a detection signal and an echo signal according to an embodiment of the present disclosure;

[0027] FIG18 is a schematic diagram of two consecutive echo signals provided by an embodiment of the present disclosure;

[0028] FIG19 is a schematic diagram showing a comparison of two consecutive echo signals provided by an embodiment of the present disclosure;

[0029] FIG20 is a schematic diagram of an arrival angle of an echo signal provided by an embodiment of the present disclosure;

[0030] FIG21 is a schematic diagram of an arrangement of multiple receiving antennas provided by an embodiment of the present disclosure;

[0031] FIG22 is a schematic structural diagram of a sixth laser projection device provided by an embodiment of the present disclosure;

[0032] FIG23 is a flowchart of a sixth laser projection device display method provided by an embodiment of the present disclosure;

[0033] FIG24 is a flow chart of a seventh laser projection device display method provided by an embodiment of the present disclosure;

[0034] FIG25 is a flowchart of an eighth laser projection device display method provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0035] Laser projection equipment (such as laser TVs and laser projectors) can project images. During the process of the laser projection equipment projecting images, if the user needs to record the images, they can use a camera device such as a mobile phone to take pictures of the images.

[0036] During the process of shooting a picture, the current output by the photosensitive element of the photographic device after sensing the light (i.e., the light emitted at the location of the picture) is different from the driving current when the light source of the laser projection device emits the light (e.g., the current output by the photosensitive element is too large), resulting in a large difference in the color of the captured picture and the color of the picture projected by the laser projection device.

[0037] The present disclosure provides a projection device, as shown in Figures 1 to 3 . The projection device includes a multimedia processing circuit 10, a display control circuit 20, a light source driving circuit 30, an optical-mechanical assembly 40, a light source 50, and a lens 60. As can be seen from Figures 1 to 3 , the projection device includes at least one light source 50 and at least one light source driving circuit 30 corresponding to the at least one light source 50. Each light source driving circuit 30 is configured to drive a corresponding light source 50 to emit light.

[0038] As shown in Figures 1 to 3, the multimedia processing circuit 10 is connected to the display control circuit 20. The multimedia processing circuit 10 is used to receive video signals through various communication interfaces, such as a universal serial bus (USB) interface, and process the video signals (e.g., brightness processing, clarity processing, color processing, etc.). Afterwards, the multimedia processing circuit 10 transmits the processed video signal to the display control circuit 20. Among them, the multimedia processing circuit 10 may include a chip-level system (system on chip, SoC). The multimedia processing circuit 10 can be connected to the display control circuit 20 through an integrated circuit bus (inter-integrated circuit, IIC) or a USB interface.

[0039] The display control circuit 20 is capable of decoding and formatting the received video signal and performing further processing (e.g., geometric correction) on the video signal. The display control circuit 20 then outputs the processed video signal to the optomechanical assembly 40 and, based on the video signal, outputs an enable signal and an analog dimming (ADIM) signal to the light source driver circuit 30. The enable signal may be a pulse width modulation (PWM) signal.

[0040] The light source driving circuit 30 is configured to receive an enable signal and an ADIM signal, and output a driving current to the corresponding light source 50 based on the enable signal and the ADIM signal, thereby driving the light source 50 to emit light. The enable signal is used to control whether the driving current is transmitted to the light source 50, and the ADIM signal is used to control the magnitude of the driving current.

[0041] The optical-mechanical assembly 40 integrates a digital micromirror device (DMD) and a DMD driver circuit. The DMD driver circuit is used to drive the DMD based on the processed video signal. Under the control of the DMD driver circuit, the DMD is used to modulate the light emitted by the light source 50 to produce the image to be projected. The lens 60 can magnify the image to be projected and project the image onto a target object in the form of a light beam. The target object can be a projection screen or a wall, for example.

[0042] In the disclosed embodiment, the light source 50 includes at least a blue light source. For example, referring to FIG1 , the projection device includes a blue light source 50_B. Accordingly, the light source driving circuit 30 is a blue light driving circuit 30_B. Alternatively, referring to FIG2 , the light source 50 includes a red light source 50_R, a green light source 50_G, and a blue light source 50_B. Accordingly, the light source driving circuit 30 includes a red light driving circuit 30_R, a green light driving circuit 30_G, and a blue light driving circuit 30_B. Alternatively, referring to FIG3 , the light source 50 includes a red light source 50_R, a green light source 50_G, a blue light source 50_B, and a yellow light source 50_Y. Accordingly, the light source driving circuit 30 includes a red light driving circuit 30_R, a green light driving circuit 30_G, a blue light driving circuit 30_B, and a yellow light driving circuit 30_Y.

[0043] In one specific embodiment, each of the at least one light source 50 is a laser light source, and accordingly, the projection device is a laser projection device. For scenarios where each light source is a laser light source, each light source can include multiple lasers connected in series. It is understood that each laser included in the red light source is a red laser, each laser included in the green light source is a green laser, each laser included in the blue light source is a blue laser, and the multiple lasers included in the yellow light source include: a red laser and a green laser. Thus, the light emitted by the yellow light source is a mixture of light emitted by the red laser and light emitted by the green laser.

[0044] The present disclosure provides a method for displaying a laser projection device. The method is applied to a projection device. For example, the method is applied to the display control circuit 20 of any projection device shown in FIG. 1 to FIG. 3 . Referring to FIG. 4 , the method includes:

[0045] Step 101: In response to an icon display instruction, display a current indication icon corresponding to at least one light source.

[0046] Each current indicator icon is used to indicate the driving current of the corresponding light source. The icon display instruction can be sent by the control device to the projection device. For example, the control device includes a menu button, and the control device can send the icon display instruction to the projection device in response to a trigger operation on the menu button.

[0047] Step 102: Receive a current adjustment operation for a target light source among at least one light source.

[0048] The current adjustment operation may be sent from the control device to the projection device.

[0049] In one specific implementation, the control device may include a current increase button and a current decrease button. In response to a trigger operation on the current increase button or the current decrease button, the control device may send a current adjustment operation for a target light source to the projection device. In this implementation, the control device may send at least one current adjustment operation to the projection device, for example, multiple consecutive current adjustment operations.

[0050] In another specific implementation, the control device may include a recording button. In response to a trigger operation on the recording button, the control device may capture a user's voice, where the voice includes the desired drive current (e.g., the expected drive current) for the target light source. After the capture is complete, the control device may send a current adjustment operation for the target light source to the projection device. Thus, the current adjustment operation may be a voice operation. In this implementation, the control device may typically send a single current adjustment operation to the projection device.

[0051] The expected driving current is the driving current of the target light source when the shooting device shoots the picture projected by the projection device to obtain a picture without color cast.

[0052] Step 103 : Adjust the driving current of the target light source based on the current adjustment operation, and update the current indication icon corresponding to the target light source.

[0053] The updated current indication icon is used to indicate the adjusted driving current of the target light source.

[0054] It can be understood that for the implementation method in which the current adjustment operation is triggered by the trigger operation of the current increase button or the current decrease button, after receiving the current adjustment operation for the target light source, the projection device can adjust the driving current of the target light source according to the adjustment step.

[0055] For the implementation of the current adjustment operation as a voice operation, after receiving the current adjustment operation for the target light source, the projection device can directly read the driving current that needs to be adjusted from the current adjustment operation, and then adjust the driving current of the target light source to the driving current that needs to be adjusted.

[0056] Step 104: Use the adjusted driving current to drive the target light source to emit light.

[0057] After the projection device adjusts the driving current of the target light source based on the current adjustment operation, the adjusted driving current can be used to drive the target light source to emit light.

[0058] In summary, the embodiments of the present disclosure provide a display method for a laser projection device, wherein the projection device is capable of adjusting the driving current of a target light source in at least one light source based on a current adjustment operation for the target light source, and driving the target light source to emit light based on the adjusted driving current. Because the color of the light emitted by the target light source changes (e.g., becomes lighter or darker) after the driving current adjustment, adjusting the driving current of the target light source can improve the color cast problem that occurs in the image captured by the camera device, thereby ensuring that the captured image has a better display effect.

[0059] The projection device can also display a current indicator icon indicating the drive current of at least one light source. This ensures that the user can more intuitively understand the drive current of each light source, allowing for accurate adjustment of the drive current and providing a better user experience. After the drive current of a target light source is adjusted, the projection device can update the current indicator icon for that target light source. This ensures that the current indicator icon for that target light source accurately indicates the drive current of the target light source.

[0060] In the embodiment of the present disclosure, if there is one light source, then the light source is the target light source. If there are multiple light sources, then any of the multiple light sources can be the target light source. The embodiment of the present disclosure uses the example of multiple light sources and the projection device receiving multiple current adjustment operations for the target light source as an example to illustrate the display method of the laser projection device provided by the embodiment of the present disclosure. This method can be applied to the display control circuit of the projection device, see Figure 5, and the method includes:

[0061] Step 201: In response to an icon display instruction, display a current indication icon corresponding to at least one light source.

[0062] Each current indication icon is used to indicate the driving current of the corresponding light source. The icon display instruction can be sent by the control device to the projection device.

[0063] For example, the control device includes a menu button. If a user wishes to use a camera to capture the image projected by the projection device, the menu button can be triggered. Accordingly, the control device can send an icon display instruction to the projection device in response to the user's triggering operation on the menu button. Upon receiving the icon display instruction, the projection device can display a current adjustment interface in response to the icon display instruction. The current adjustment interface can display a current indicator icon corresponding to at least one light source.

[0064] In a specific embodiment, the control device may be a remote control of the projection device. The menu button may be a physical button of the remote control. The remote control may send an icon display instruction to the projection device by sending an infrared signal.

[0065] Alternatively, the control device may be a mobile terminal. As shown in FIG6 , the mobile terminal may establish a communication connection with the projection device, and the mobile terminal may send an icon display instruction to the projection device via the communication connection. In addition, the menu button of the control device may be a virtual control displayed on the mobile terminal.

[0066] In the embodiment of the present disclosure, the multimedia circuit of the projection device may receive the icon display instruction sent by the control device, and may send the icon display instruction to the display control circuit of the projection device.

[0067] For example, if the multiple light sources are a red light source, a green light source, and a blue light source, referring to Figure 7, the projection device can display a current indication icon corresponding to the red light source, a current indication icon corresponding to the green light source, and a current indication icon corresponding to the blue light source in response to the icon display instruction.

[0068] If the multiple light sources are respectively a red light source, a green light source, a blue light source and a yellow light source, referring to Figure 8, the projection device can display a current indication icon corresponding to the red light source, a current indication icon corresponding to the green light source, a current indication icon corresponding to the blue light source, and a current indication icon corresponding to the yellow light source in response to the icon display instruction.

[0069] As can be seen from FIG. 7 and FIG. 8 , each current indication icon may include a numerical value for indicating the magnitude of the driving current of the corresponding light source.

[0070] Step 202: Receive a current adjustment operation for a target light source among at least one light source.

[0071] The current adjustment operation may be sent from the control device to the projection device.

[0072] In an embodiment of the present disclosure, the control device may include a current increase button and a current decrease button. In response to a trigger operation on the current increase button or the current decrease button, the control device may send a current adjustment operation for the target light source to the projection device.

[0073] It is understood that if the control device receives a trigger operation for the current increase button, the current adjustment operation sent to the projection device is used to instruct the projector to increase the driving current of the target light source. If the control device receives a trigger operation for the current increase button, the current adjustment operation sent to the projection device is used to instruct the projector to increase the driving current of the target light source.

[0074] Furthermore, when the control device is a remote controller, the current increase button and the current decrease button are both physical buttons of the remote controller. When the control device is a mobile terminal, the current increase button and the current decrease button are both virtual controls displayed on the mobile terminal.

[0075] In an embodiment of the present disclosure, for a scenario in which multiple light sources are present, the control device can, in response to a user selecting a target current indicator icon from among multiple current indicator icons, send a selection operation for a target light source corresponding to the target current indicator icon to the projection device, allowing the projection device to select the target light source from the multiple light sources. The control device can then send a current adjustment operation for the target light source to the projection device. In response, the projection device can receive the current adjustment operation for the target light source.

[0076] It is understood that the target current indicator icon can be determined based on the color cast of the image captured by the camera device while the image is projected by the projection device. For example, if the image captured by the camera device is greenish, the target current indicator icon can be the current indicator icon corresponding to the green light source. If the image captured by the camera device is reddish, the target current indicator icon can be the current indicator icon corresponding to the red light source.

[0077] Step 203 : Based on the received current adjustment operation, adjust the driving current of the target light source according to the adjustment step size, and update the current indication icon of the target light source.

[0078] The updated current indicator icon indicates the adjusted drive current of the target light source. The adjustment step size is positively correlated with the target difference, which is the difference between the maximum and minimum drive currents of the target light source. The maximum drive current is the maximum current flowing through the target light source when it is operating, and the minimum drive current is the minimum current required to maintain the target light source's operation.

[0079] In one embodiment, the adjustment step size may be equal to the quotient of the target difference and the number of adjustments. The number of adjustments refers to the maximum number of times the adjustment can be increased or decreased. For example, the number of adjustments may be 50.

[0080] For example, assume that the maximum drive current of the red light source is 4 amperes (A) and the minimum drive current is 2.5 A, the maximum drive current of the green light source is 3 A and the minimum drive current is 1 A, and the maximum drive current of the blue light source is 2.5 A and the minimum drive current is 1 A. Assuming the number of adjustments is 50, the adjustment step size of the red light source is 0.03 A, the adjustment step size of the green light source is 0.04 A, and the adjustment step size of the blue light source is 0.03 A.

[0081] Assuming that the target light source is a green light source, the adjustment step size of the green light source is 0.04A, and the adjustment operation for the green light source is used to instruct to reduce the driving current of the green light source, the display control device may reduce the driving current of the green light source by 0.04A.

[0082] Step 204 : Detect whether a current adjustment operation for the target light source is received again within a target time period after the current adjustment operation for the target light source is received.

[0083] After each current adjustment operation for a target light source is received, the display control circuit may detect whether another current adjustment operation for the target light source is received within a target duration of the current adjustment operation. The target duration may be pre-stored by the display control circuit. For example, the target duration may be 2 seconds.

[0084] If the display control circuit receives the current adjustment operation for the target light source again within the target duration, step 203 may be executed. If the display control circuit does not receive the current adjustment operation for the target light source within the target duration, step 205 may be executed.

[0085] In this way, it is possible to avoid the display control circuit from frequently using the adjusted driving current to drive the target light source to emit light, thereby wasting processing resources of the display control circuit.

[0086] Step 205: Use the adjusted driving current to drive the target light source to emit light.

[0087] If the display control circuit does not receive another current adjustment operation for the target light source within a target time period after receiving the current adjustment operation for the target light source, the display control circuit uses the adjusted driving current to drive the target light source to emit light.

[0088] In an embodiment of the present disclosure, the display control circuit may provide an ADIM signal to the light source driver circuit corresponding to the target light source based on the adjusted drive current of the target light source. The ADIM signal may be used to indicate the magnitude of the adjusted drive current. Upon receiving the ADIM signal, the light source driver circuit may output the adjusted drive current to the target light source based on the ADIM signal to drive the target light source to emit light.

[0089] It is understood that the user can, based on the color cast of the image captured by the camera, control the display control circuit to adjust the driving current of the light source once (or multiple times) through the control device. Accordingly, steps 201 to 205 can be performed once (or multiple times) by the display control circuit until the camera captures an image without color cast.

[0090] It is also understood that the order of the steps in the method for driving a light source provided in the embodiments of the present disclosure can be adjusted appropriately, and steps can be added or removed as needed. For example, step 204 can be deleted as needed. Any variation that can be readily conceived by a person skilled in the art within the scope of the present disclosure is intended to be covered by the scope of protection of the present disclosure, and therefore will not be described in detail.

[0091] In summary, the embodiments of the present disclosure provide a method for driving a light source. A projection device can adjust the driving current of a target light source within at least one light source based on a current adjustment operation for the target light source, and then drive the target light source to emit light based on the adjusted driving current. Since the color of the light emitted by the target light source changes (e.g., becomes lighter or darker) after the driving current adjustment, adjusting the driving current of the target light source can improve the color cast problem that occurs in images captured by a camera device, thereby ensuring that the captured images have a better display quality.

[0092] The projection device can also display a current indicator icon indicating the drive current of at least one light source. This ensures that the user can more intuitively understand the drive current of each light source, allowing for accurate adjustment of the drive current and providing a better user experience. After the drive current of a target light source is adjusted, the projection device can update the current indicator icon for that target light source. This ensures that the current indicator icon for that target light source accurately indicates the drive current of the target light source.

[0093] FIG9 is a flow chart of another method for driving a light source provided by an embodiment of the present disclosure, which can be applied to a display control circuit of a projection device. Referring to FIG9 , the method includes:

[0094] Step 301: Receive a setting instruction for a shooting mode.

[0095] The setting instruction for the shooting mode may be sent by the control device to the projection device. The shooting mode refers to an operating mode of the projection device when the difference between the color of the image projected by the projection device and the color of the image captured by the camera device is less than a difference threshold. The difference threshold may be 1.

[0096] In one specific embodiment, the control device may include a capture button. If a user wishes to use the camera to capture the image projected by the projection device, the capture button may be triggered. Accordingly, the control device may send a capture mode setting instruction to the control device in response to the user triggering the capture button.

[0097] Alternatively, the control device may include a menu button. If a user wishes to use a camera to capture the image projected by the projection device, the menu button may be triggered. In response to the user triggering the menu button, the control device may send a display instruction for a menu interface to the projection device. Accordingly, the projection device may respond to the display instruction by displaying a menu interface, where the menu interface includes a capture mode. Then, in response to the capture mode being selected, the control device may send a setting instruction for the capture mode to the projection device.

[0098] It is understood that the control device may be a remote control for the projection device. In this case, the capture button and menu button may be physical buttons on the remote control. Alternatively, the control device may be a mobile terminal that has established a communication connection with the projection device. In this case, the capture button and menu button may be virtual controls displayed on the mobile terminal.

[0099] Step 302: In response to the setting instruction, obtain a first driving current of the light source in the shooting mode.

[0100] The first driving current of the light source in the shooting mode refers to the driving current of the light source when the shooting device captures the image projected by the projection device and obtains an image without color cast. The first driving current of the light source in the shooting mode may be pre-stored by the display control circuit.

[0101] In an embodiment of the present disclosure, the projection device may include at least one light source. If the at least one light source is multiple, the display control circuit may pre-store a first driving current for each of the multiple light sources in the shooting mode.

[0102] It can be understood that the first driving current of each light source in the shooting mode can be obtained by detecting the first driving current of the light source when the staff uses the shooting equipment to shoot the picture projected by the projection equipment, and determines that the picture captured by the shooting equipment has no color cast.

[0103] For example, the staff can use a camera to shoot the image projected by the projection device and observe the color cast of the captured image. If the captured image is bluish, the staff can control the display control circuit through the control device to reduce the driving current of the blue light source; if the captured image is reddish, the staff can control the display control circuit through the control device to reduce the driving current of the red light source. After the driving current of the light source is adjusted, the staff can use the camera to shoot again, and after determining that the captured image has color cast, adjust the driving current of the light source again until the captured image does not have color cast. Afterwards, the staff can detect the driving current of each light source at this time, thereby obtaining the first driving current of each light source in the shooting mode.

[0104] In an embodiment of the present disclosure, after the control device sends a setting instruction for the shooting mode, the multimedia circuit of the projection device can receive the setting instruction, process the format of the setting instruction, and transmit the processed setting instruction to the display control circuit. After receiving the setting instruction, the display control circuit can obtain the first driving current of the light source in the shooting mode. The multimedia circuit can process the format of the setting instruction into a format that the display control circuit can recognize.

[0105] Step 303: Use a first driving current to drive the light source to emit light, so that the projection device operates in a shooting mode.

[0106] After the display control circuit obtains the driving current of the light source in the shooting mode, it can use the first driving current to drive the light source to emit light, so that the projection device works in the shooting mode.

[0107] For example, the display control circuit may provide an ADIM signal to the light source driving circuit of the light source according to the first driving current. The light source driving circuit receives the ADIM signal and outputs the first driving current in the shooting mode to the light source based on the ADIM signal.

[0108] In summary, the disclosed embodiments provide a display method for a laser projection device. After receiving a setting instruction for a shooting mode, the display control circuit of the projection device can obtain a first drive current for a light source in shooting mode and use the first drive current to drive the light source to emit light. Because the first drive current for the light source in shooting mode is the drive current for the light source when the image captured by the shooting device is free of color cast, using the first drive current in shooting mode to drive the light source can effectively avoid color cast in the image captured by the shooting device.

[0109] It should be noted that, when receiving the setting instruction for the shooting mode, the projection device may adopt other technical solutions in addition to receiving the setting instruction for the shooting mode sent by the control device.

[0110] FIG10 is a schematic diagram of the structure of another projection device provided by an embodiment of the present disclosure. Referring to FIG10 , the projection device includes a projection host 1 and a radar 2 connected to the projection host 1 .

[0111] Driven by the operating voltage provided by the projection host 1, the radar 2 can transmit a detection signal, receive an echo signal emitted by a target object, and identify the target object's hand gesture based on the echo signal. The radar 2 can then send the recognized gesture to the projection host 1, which can then control the projection device to enter or exit shooting mode based on the recognized gesture.

[0112] In some examples, the target object is a human body. Radar 2 may be a millimeter-wave radar or an ultrasonic radar. If radar 2 is a millimeter-wave radar, the detection signal may be a millimeter-wave signal, such as a frequency modulated continuous wave (FMCW). If radar 2 is an ultrasonic radar, the detection signal may be an ultrasonic signal.

[0113] Figure 11 is a schematic diagram of the structure of a projection host 1 provided in an embodiment of the present disclosure. Referring to Figure 11 , projection host 1 includes a multimedia processing circuit 10, a display control circuit 20, a light source driving circuit 30, an optical-mechanical assembly 40, a light source 50, and a lens 60. The detailed structure of projection host 1 can be found in the aforementioned description of Figures 1-3 and will not be repeated here.

[0114] Based on a projection device including a radar, an embodiment of the present disclosure provides a laser projection device display method, which is applied to the projection device, for example, applied to the display control circuit 20 of the projection device. Referring to FIG12 , the method includes:

[0115] Step 401: Control the radar to transmit a detection signal, and collect the echo signal reflected by the target object through the radar.

[0116] In the disclosed embodiment, once the projection device is activated, the radar in the projection device can emit a detection signal. When a target enters the radar's detection area, the detection signal can be reflected by the target, generating an echo signal. The radar can then receive the echo signal.

[0117] Step 402: Identify the hand gesture of the target object based on the echo signal.

[0118] In an embodiment of the present disclosure, the radar in the projection device can determine the point cloud data of the target object's hand based on the received echo signal, and then determine the hand gesture based on the point cloud data.

[0119] The gesture may be one of the following: a first gesture for instructing the projection device to enter a shooting mode, and a second gesture for instructing the projection device to exit the shooting mode. The shooting mode refers to an operating mode of the projection device when the shooting device captures the image projected by the projection device to obtain an image without color cast.

[0120] Step 403: If the hand gesture is the first gesture for indicating entering the shooting mode, the first driving current in the shooting mode is used to drive the light source to emit light, so that the projection device operates in the shooting mode.

[0121] When the hand gesture is identified as the first gesture for instructing to enter the shooting mode, it is determined that the projection device has received a setting instruction for the shooting mode.

[0122] After the projection device recognizes the target's hand gesture, it can detect whether the gesture is a first gesture for instructing the projection device to enter a capture mode. If the projection device determines that the gesture is the first gesture, it can read a pre-stored first drive current for the capture mode and use the first drive current to drive the light source to emit light, thereby causing the projection device to operate in the capture mode.

[0123] The first driving current refers to the driving current of the light source when the shooting device shoots the picture projected by the projection device to obtain a picture without color cast.

[0124] In summary, the embodiments of the present disclosure provide a method for displaying a laser projection device, which can identify the gesture of a target object through a radar, and after identifying that the gesture is a first gesture for indicating entering a shooting mode, uses the first driving current in the shooting mode to drive the light source. Since the first driving current is the driving current of the light source when the image captured by the shooting device is free of color cast, using the first driving current to drive the light source can ensure that the shooting device captures an image without color cast. In addition, since the method can control the working mode of the projection device based on the gesture of the target object's hand, the flexibility of controlling the projection device is improved.

[0125] The embodiment of the present disclosure takes a millimeter-wave radar as an example to exemplify the display method of the laser projection device provided by the embodiment of the present disclosure. Referring to FIG13 , the method may include:

[0126] Step 501: Control the radar to transmit a detection signal, and collect the echo signal reflected by the target object through the radar.

[0127] In the disclosed embodiment, once the projection device is activated, the radar can emit a detection signal. When a target enters the radar's detection area, the detection signal can be reflected by the target, generating an echo signal. The radar can then receive the echo signal.

[0128] In a specific embodiment, after the projection device is started, the radar can emit a detection signal under the drive of the working voltage provided by the multimedia processing circuit of the projection device. Alternatively, the projection device may further include: a voice detection component. The voice detection component can collect voice instructions, and after determining that the voice instructions include a wake-up keyword, send a wake-up signal to the multimedia processing circuit. The multimedia processing circuit is also used to provide a power supply voltage to the radar after receiving the wake-up signal, so that the radar emits a detection signal. That is, the method provided in the embodiment of the present disclosure can wake up the radar by far-field voice, and then identify the hand gestures of the target object. In this way, electric energy can be saved. Among them, the wake-up keyword can be pre-stored in the voice detection component.

[0129] Referring to Figure 14, the radar includes: a signal synthesizer 01, at least one transmit antenna 02 (also called a TX antenna 02), and multiple receive antennas 03 (also called RX antennas 03). The signal synthesizer 01 is connected to the multimedia processing circuit 10 of the projection device, and the signal synthesizer 01 is used to generate a detection signal (such as FMCW) driven by the operating voltage provided by the multimedia processing circuit 10, and transmit the detection signal through the transmit antenna 02. After the transmitted detection signal is transmitted to the target object A, it can be reflected by the target object A to generate an echo signal. Then, the radar can receive the echo signal through the multiple receive antennas 03.

[0130] Figure 15 is a schematic diagram showing how the amplitude of a detection signal varies over time, provided in an embodiment of the present disclosure. Figure 16 is a schematic diagram showing how the frequency of a detection signal varies over time, provided in an embodiment of the present disclosure. In Figure 16, fs is the initial frequency of the detection signal, fe is the final frequency of the detection signal, and S is the rate of change of the frequency of the detection signal within the duration Tc, i.e., the slope.

[0131] As shown in Figure 15, the detection signal can be a signal whose frequency increases over time, known as a chirp signal. A chirp signal is an electromagnetic wave signal whose frequency varies with time. Figure 16 shows that the frequency of the chirp signal can increase linearly over time. This indicates that the detection signal is a linear FMCW signal. Furthermore, Figure 16 also shows that the bandwidth B of the detection signal satisfies: B = fe - fs. Correspondingly, the slope S satisfies: S = B / Tc.

[0132] Step 502: Determine the point cloud data of the hand of the target object based on the echo signal.

[0133] In the disclosed embodiment, referring to Figure 14 , the radar further includes a mixer 04, a signal processing circuit 05, and a main control circuit 06. Mixer 04 is capable of mixing the detection signal generated by signal synthesizer 01 with the echo signal received by each of the multiple receiving antennas 03 to obtain an intermediate frequency (IF) signal corresponding to each of the multiple receiving antennas 03, and transmits the IF signal corresponding to the multiple receiving antennas 03 to signal processing circuit 05. The frequency of the IF signal corresponding to each receiving antenna 03 is equal to the difference between the instantaneous frequency of the detection signal and the instantaneous frequency of the echo signal received by the receiving antenna at any moment.

[0134] The signal processing circuit 05 can first filter the intermediate frequency signals corresponding to the multiple receiving antennas 03 to filter out the interference in the multiple intermediate frequency signals, and then perform analog-to-digital conversion on the filtered intermediate frequency signals to obtain digitized intermediate frequency signals, and transmit the digitized intermediate frequency signals to the main control circuit 06.

[0135] For each of the multiple receiving antennas, the main control circuit 06 can perform digital-to-analog conversion on the digitized intermediate frequency signal from the receiving antenna 03 and perform a fast Fourier transform (FFT) on the processed intermediate frequency signal to obtain a two-dimensional grid data table (also known as a range-Doppler matrix) of the range and Doppler dimensions corresponding to the receiving antenna. The Doppler dimension in the range-Doppler matrix represents the speed of the target's hand relative to the radar, the range dimension represents the distance of the hand relative to the radar, and the elements in the range-Doppler matrix represent the signal strength of the intermediate frequency signal determined based on the echo signal reflected from the target's hand at the corresponding distance and speed. Peaks in the range-Doppler matrix indicate the presence of a target at the corresponding distance. In other words, the main control circuit can determine the distance from the target's hand to the radar based on the peaks in the range-Doppler matrix. For example, if the value of the range dimension corresponding to a peak in the range-Doppler matrix is ​​2 meters (m), the main control circuit can determine that the distance from the target's hand to the radar is 2 meters.

[0136] The main control circuit can then generate multiple two-dimensional network data tables of azimuth and Doppler dimensions based on the range-Doppler matrices of the multiple receiving antennas. The main control circuit can then perform incoherent accumulation processing on the multiple two-dimensional grid data tables of received range and Doppler dimensions, as well as the two-dimensional network data tables of azimuth and Doppler dimensions, to obtain three-dimensional point cloud data of the target hand in the range, azimuth, and Doppler dimensions. Each point in the point cloud data contains characteristic information such as distance, movement speed, and azimuth.

[0137] For example, see Figure 17, which shows a schematic diagram of an intermediate frequency signal obtained by mixing a detection signal with an echo signal. As shown in Figure 17, after the transmitting antenna transmits the detection signal (i.e., the TX signal shown in Figure 17), the receiving antenna receives the echo signal (i.e., the RX signal shown in Figure 17) after a period of time τ. Therefore, it can be seen that the transmission time of the detection signal emitted by the transmitting antenna between the projector device and the target object is τ (also known as the delay time).

[0138] As can be seen from Figure 17, the frequency f0 of the intermediate frequency signal obtained by mixing the transmitting antenna and the receiving antenna can be equal to the difference between the instantaneous frequency of the detection signal and the instantaneous frequency of the echo signal. That is, the frequency f0 can satisfy the following formula:

[0139] f0=S*τ Formula (1)

[0140] Step 503: Determine the hand gesture of the target object based on the point cloud data.

[0141] In the disclosed embodiment, the projection device can extract features from point cloud data using radar to obtain characteristic information about the hand of the target object. This characteristic information includes the distance of the hand relative to the radar, the azimuth of the hand relative to the radar, and the speed of the hand relative to the radar. The radar can then determine the hand gesture based on this characteristic information.

[0142] In one specific embodiment, a gesture recognition model is pre-stored in the radar. The radar can input feature information into the gesture recognition model to obtain a hand gesture output from the gesture recognition model. The gesture recognition model can be trained based on multiple sample information, each of which includes a sample gesture and the distance, azimuth, and movement speed of the hand associated with the sample gesture relative to the radar.

[0143] In the disclosed embodiment, the gesture recognition model can generate a time series corresponding to each feature (i.e., distance, azimuth, and movement speed) in the feature information of the target object's hand based on the feature information. The gesture recognition model can then decompose the time series corresponding to each feature in chronological order to determine the target object's hand movements at each moment within the target time period (i.e., the detection signal transmission period). The gesture recognition model can then derive the target object's hand gesture based on the chronologically arranged movements.

[0144] For example, based on the feature information of the point cloud data, the gesture recognition model obtains the three actions of "naturally spreading the palm, moving horizontally to the left and right, and keeping the tiger's mouth open during the activity". After that, the gesture recognition model can determine the gesture of the target object's hand as "horizontally moving the palm forward and backward" based on the three actions.

[0145] In one specific embodiment, the radar pre-stores multiple candidate feature information corresponding to multiple candidate gestures. The multiple candidate gestures include a first gesture for instructing the projection device to enter a capture mode, and a second gesture for instructing the projection device to exit the capture mode. The radar can determine the similarity between each candidate feature information in the multiple candidate feature information and the feature information of the target's hand, and can determine the candidate gesture corresponding to the candidate feature information with the highest similarity among the multiple candidate feature information as the target's hand gesture.

[0146] In the disclosed embodiment, based on the radar's ranging principle, the radar can determine the distance of the target's hand relative to the radar based on the frequency f0 of the intermediate frequency signal corresponding to the receiving antenna. Based on the radar's speed measurement principle, the radar can determine the moving speed of the target's hand relative to the radar based on the phase difference between two consecutive intermediate frequency signals corresponding to the receiving antenna. Based on the radar's angle measurement principle, the radar can determine the azimuth of the target's hand relative to the radar based on the phase difference between the intermediate frequency signals corresponding to at least two of the multiple receiving antennas and the difference in distances from the target's hand to the at least two receiving antennas.

[0147] The radar ranging principle is as follows: the transmission time of the detection signal emitted by the transmitting antenna between the projection device and the target object is τ, and τ satisfies the following formula:

[0148] In formula (2), d is the distance between the target hand and the radar, and c is the speed of light.

[0149] Since the frequency of the intermediate frequency signal can be obtained from the point cloud data, the distance d of the target hand relative to the radar can be determined by the above formulas (1) and (2). The distance d can satisfy the following formula:

[0150] In formula (3), S is the rate of change of the frequency of the detection signal within the duration Tc, and S is equal to the quotient of the bandwidth of the detection signal and the duration.

[0151] Radar speed measurement is based on Doppler shift. Doppler shift refers to the phase and frequency changes in the intermediate frequency signal synthesized by the radar mixer caused by the difference in wave propagation distance when a target moves at a constant speed in a certain direction.

[0152] For example, the radar transmits a detection signal through at least one transmitting antenna at fixed intervals of time Tc, i.e., each detection signal lasts for a duration of Tc. Referring to Figure 18 , assume that the radar transmits detection signals TX1 and TX2 through at least one transmitting antenna at fixed intervals of time Tc. After reflection from the target's hand, detection signal TX1 produces echo signal RX1, and after reflection from the target's hand, detection signal TX2 produces echo signal RX2. If echo signals RX1 and RX2 have the same frequency and phase (i.e., a phase difference of 0), this indicates that the target's hand is stationary.

[0153] If the echo signals RX1 and RX2 have the same frequency but different phases, it indicates that the target's hand is in motion. If the target's hand is in motion, the radar can determine the speed of the target's hand based on the phase difference between the echo signals RX1 and RX2.

[0154] Assuming that the moving speed of the target object's hand is v, the distance Δd moved by the target object's hand within the time length Tc can satisfy the following formula: Δd=v×Tc Formula (4)

[0155] Since the phase of the intermediate frequency signal corresponding to the receiving antenna The following formula (5) is satisfied, so the phase difference between the two consecutive intermediate frequency signals corresponding to the receiving antenna is The following formula (6) can be satisfied:

[0156] In formula (5), d is the distance from the target hand to the radar, and λ is the wavelength of the detection signal when the frequency is the initial frequency.

[0157] Based on the above formulas (4) and (6), it can be determined that the moving speed v of the target object's hand satisfies:

[0158] For example, see Figure 19, which shows a schematic diagram comparing two consecutive echo signals. As can be seen from Figure 19, the two echo signals have different frequencies and phases. This indicates that the target's hand is in motion.

[0159] Taking the azimuth angle as the angle of arrival, the radar angle measurement principle is illustrated as follows: Assume that the propagation directions of the echo signals emitted by the target and arriving at multiple receiving antennas are parallel. As shown in Figure 20, the angle between the propagation direction of the echo signals and the target direction is defined as the echo signal's angle of arrival θ. The multiple receiving antennas (i.e., RX Antenna 0, RX Antenna 1, and RX Antenna 2 shown in Figure 20) are coaxial array antennas, and the target direction X can be perpendicular to the extension direction Y of the coaxial array antenna's axis.

[0160] As shown in Figure 21, the distance between two adjacent receiving antennas is r. Therefore, based on the principle of similar triangles, it can be determined that the relative delay experienced by the echo signals reaching the two adjacent receiving antennas satisfies:

[0161] Then, according to formula (5) and formula (8), it can be determined that the phase difference of the intermediate frequency signals corresponding to two adjacent receiving antennas satisfies:

[0162] Then, based on the above formula (9), it can be determined that the arrival angle θ satisfies:

[0163] Step 504: If the hand gesture is the first gesture for indicating entering the shooting mode, the first driving current in the shooting mode is used to drive the light source to emit light, so that the projection device operates in the shooting mode.

[0164] When the hand gesture is recognized as the first gesture for indicating entering the shooting mode, it is determined that the projection device has received the setting instruction for the shooting mode. The first driving current refers to the driving current of the light source when the shooting device captures the image projected by the projection device to obtain an image without color cast.

[0165] In a specific embodiment, if the projection device determines that the target object's hand gesture is the first gesture and the projection device is currently operating in a non-shooting mode, the first driving current in the shooting mode may be used to drive the light source to emit light.

[0166] In an embodiment of the present disclosure, after the radar recognizes a hand gesture of a target object, the recognized gesture may be sent to the multimedia processing circuit. If the multimedia processing circuit determines that the hand gesture is the first gesture, it may detect whether the camera is operating in a non-shooting mode. If the multimedia processing circuit determines that the camera is operating in a shooting mode, it may terminate the operation.

[0167] If the multimedia processing circuit determines that the camera is operating in a non-shooting mode, it can send a first control instruction to the display control circuit. The first control instruction is used to instruct the display control circuit to drive the light source to emit light using a first drive current in the shooting mode. Accordingly, upon receiving the first control instruction, the display control circuit can read the pre-stored first drive current in the shooting mode and then drive the light source to emit light using the first drive current, thereby causing the projection device to operate in the shooting mode.

[0168] In a specific embodiment, the multimedia processing circuit may be connected to the display control circuit via an inter-integrated circuit (IIC) bus.

[0169] Step 505: If the hand gesture is the second gesture for exiting the shooting mode, and the projection device is operating in the shooting mode, the second driving current in the non-shooting mode is used to drive the light source to emit light, so that the projection device exits the shooting mode.

[0170] The second driving current is a driving current of the light source determined based on the picture to be projected by the projection device.

[0171] In an embodiment of the present disclosure, after the radar sends the recognized gesture to the multimedia processing circuit, if the multimedia processing circuit determines that the gesture is the second gesture, it can detect whether the shooting device is working in the shooting mode. If the multimedia processing circuit determines that the shooting device is working in the non-shooting mode, the operation can be ended. If the multimedia processing circuit determines that the shooting device is working in the shooting mode, a second control instruction can be sent to the display control circuit. The second control instruction is used to instruct the display control circuit to use the second driving current in the non-shooting mode to drive the light source to emit light. Accordingly, after receiving the second control instruction, the display control circuit can read the driving current determined based on the picture to be projected by the projection device, and then use the second driving current to drive the light source to emit light, so that the projection device exits the shooting mode.

[0172] The above embodiment is illustrative, using a millimeter-wave radar as an example. It is understood that the radar may also be an ultrasonic radar. In the case of an ultrasonic radar, the detection signal emitted by the radar is an ultrasonic signal. Accordingly, the radar can recognize hand gestures based on the ultrasonic signal reflected by the target hand.

[0173] It is understood that the order of the steps in the light source driving method provided in the embodiments of the present disclosure can be adjusted appropriately, and steps can be added or removed as needed. For example, step 505 can be deleted as needed. Any variation that can be readily conceived by a person skilled in the art within the technical scope of this disclosure is intended to be covered by the scope of protection of this disclosure, and therefore will not be further described.

[0174] In summary, the embodiments of the present disclosure provide a method for displaying a laser projection device, which can identify the gesture of a target object through a radar, and after identifying that the gesture is a first gesture for indicating entering a shooting mode, uses the first driving current in the shooting mode to drive the light source. Since the first driving current is the driving current of the light source when the image captured by the shooting device is free of color cast, using the first driving current to drive the light source can ensure that the shooting device captures an image without color cast. In addition, since the method can control the working mode of the projection device based on the gesture of the target object's hand, the flexibility of controlling the projection device is improved.

[0175] Figure 22 is a structural diagram of another projection device provided by an embodiment of the present disclosure. Referring to Figure 22, the projection device includes: a projection host 1 and a voice detection component 3. After receiving a first voice instruction including a wake-up keyword, the voice detection component 3 can perform voice recognition on a subsequently received second voice instruction, and after recognizing that the second voice instruction is used to indicate entering (or exiting) the shooting mode, trigger the projection device to enter (or exit) the shooting mode. The connection relationship between the components of the projection host 1 is detailed in the description of Figures 1 to 3, and the embodiments of the present disclosure will not be repeated here.

[0176] Based on a projection device including a voice detection component, an embodiment of the present disclosure further provides a laser projection device display method, which is applied to the projection device. Referring to FIG23 , the method includes:

[0177] Step 601: If the received first voice instruction includes a wake-up keyword, perform voice recognition on a second voice instruction received after the first voice instruction.

[0178] In the disclosed embodiment, after the projection device is turned on, a voice detection component in the projection device can collect a first voice command and detect whether the first voice command includes a wake-up keyword. If the voice detection component determines that the first voice command includes the wake-up keyword, voice recognition can be performed on a second voice command received after the first voice command.

[0179] If the voice detection component determines that the first voice instruction does not include the wake-up keyword, the first voice instruction may be collected and detected to see whether the collected first voice instruction includes the wake-up keyword. The wake-up keyword may be pre-stored in the voice detection component.

[0180] Step 602: If the second voice command is recognized as a voice command for instructing to enter the shooting mode, the first driving current in the shooting mode is used to drive the light source to emit light, so that the projection device operates in the shooting mode.

[0181] When the second voice command is recognized as a voice command for instructing the shooting mode, it is determined that the projection device has received a setting instruction for the shooting mode. The shooting mode refers to an operating mode of the projection device when the shooting device captures the image projected by the projection device to obtain an image without color cast. Correspondingly, the first driving current refers to the driving current of the light source when the shooting device captures the image projected by the projection device to obtain an image without color cast, that is, the driving current of the light source that enables the shooting device to operate in the shooting mode.

[0182] In summary, the embodiments of the present disclosure provide a method for displaying a laser projection device, which can perform voice recognition on a collected second voice instruction after determining that the first voice instruction includes a wake-up keyword, and after recognizing that the second voice instruction is used to instruct to enter a shooting mode, use the first driving current in the shooting mode to drive the light source. Since the first driving current is the driving current of the light source when the picture captured by the shooting device has no color cast, using the first driving current to drive the light source can ensure that the shooting device captures a picture without color cast. In addition, since the method can control the working mode of the projection device based on voice instructions, the flexibility of controlling the projection device is improved.

[0183] FIG24 is another projection device display method provided by an embodiment of the present disclosure, which can be applied to a projection device. Referring to FIG24 , the method may include:

[0184] Step 701: Detect whether the received first voice instruction includes a wake-up keyword.

[0185] In an embodiment of the present disclosure, the projection device includes a voice detection component. After the projection device is started, the voice detection component in the projection device can collect a first voice instruction and detect whether the first voice instruction includes a wake-up keyword.

[0186] If the voice detection component determines that the first voice instruction includes the wake-up keyword, step 702 may be executed. If the voice detection component determines that the first voice instruction does not include the wake-up keyword, the first voice instruction may continue to be collected and step 701 may be executed. The wake-up keyword may be pre-stored in the voice detection component.

[0187] In an embodiment of the present disclosure, the voice detection component may include: a microphone and a voice recognition subcomponent. The microphone may capture a first voice instruction and send the captured first voice instruction to the voice recognition subcomponent for the voice recognition subcomponent to detect whether the first voice instruction includes a wake-up keyword.

[0188] Step 702: Perform voice recognition on a second voice instruction received after the first voice instruction.

[0189] If the projection device determines that the received first voice instruction includes a wake-up keyword, voice recognition can be performed on a second voice instruction received after the first voice instruction.

[0190] In an embodiment of the present disclosure, if the first voice instruction includes a wake-up keyword, the microphone may capture a second voice instruction and send the second voice instruction to the voice recognition subcomponent, which may then perform voice recognition on the second voice instruction.

[0191] Step 703: If the second voice command is recognized as a voice command for instructing to enter the shooting mode, the first driving current in the shooting mode is used to drive the light source to emit light, so that the projection device operates in the shooting mode.

[0192] When the second voice command is recognized as a voice command for instructing to enter a shooting mode, it is determined that the projection device has received a setting instruction for the shooting mode. The first driving current refers to the driving current of the light source when the shooting device captures the image projected by the projection device to obtain an image without color cast.

[0193] In a specific embodiment, if the projection device determines that the second voice command is a voice command for instructing to enter the shooting mode, and the projection device is currently operating in the non-shooting mode, the first driving current in the shooting mode can be used to drive the light source to emit light.

[0194] In an embodiment of the present disclosure, after the voice detection component determines that the second voice instruction is recognized, it can also detect whether the recognized second voice instruction is a voice instruction for instructing to enter the shooting mode. If the voice detection component recognizes that the second voice instruction is a voice instruction for instructing to enter the shooting mode, a first signal for instructing to enter the shooting mode can be sent to the multimedia processing circuit of the projection device. After the multimedia processing circuit receives the first signal, if it is determined that the projection device is currently operating in a non-shooting mode, a first control instruction can be sent to the display control circuit. Accordingly, the display control circuit can respond to the first control instruction, read the first drive current in the pre-stored shooting mode, and use the first drive current to drive the light source to emit light, so that the projection device operates in the shooting mode.

[0195] Step 704: If the second voice command is recognized as a voice command for exiting the shooting mode, and the projection device is operating in the shooting mode, the second driving current in the non-shooting mode is used to drive the light source to emit light, thereby causing the projection device to exit the shooting mode. The second driving current is a driving current for the light source determined based on the image to be projected by the projection device.

[0196] In an embodiment of the present disclosure, after the voice detection component determines that the second voice instruction is recognized, if it is determined that the recognized second voice instruction is a voice instruction for instructing to exit the shooting mode, a second signal for instructing to enter and exit the shooting mode can be sent to the multimedia processing circuit of the projection device. After the multimedia processing circuit receives the second signal, if it is determined that the projection device is currently in the shooting mode, a second control instruction can be sent to the display control circuit. Accordingly, the display control circuit can respond to the second control instruction and use the second driving current in the non-shooting mode to drive the light source to emit light, so that the projection device operates in the non-shooting mode.

[0197] As can be seen from the above description, the method provided by the embodiments of the present disclosure can control the projection device to enter or exit shooting mode through far-field voice. In this way, the control flexibility of the projection device can be improved while ensuring that the images captured by the camera device are free of color cast.

[0198] It is understood that the order of the steps of the laser projection device display method provided in the embodiments of the present disclosure can be adjusted appropriately, and steps can be added or removed as needed. For example, step 704 can be deleted as needed. Any method that can be easily conceived by a person skilled in the art within the scope of the present disclosure should be included in the scope of protection of the present disclosure, and therefore will not be described in detail.

[0199] In summary, the embodiments of the present disclosure provide a method for displaying a laser projection device, which can perform voice recognition on a collected second voice instruction after determining that the first voice instruction includes a wake-up keyword, and after recognizing that the second voice instruction is used to instruct to enter a shooting mode, use the first driving current in the shooting mode to drive the light source. Since the first driving current is the driving current of the light source when the picture captured by the shooting device has no color cast, using the first driving current to drive the light source can ensure that the shooting device captures a picture without color cast. In addition, since the method can control the working mode of the projection device based on voice instructions, the flexibility of controlling the projection device is improved.

[0200] The relationship between the first driving current and the second driving current is exemplarily described below, wherein the first driving current is the driving current of the light source in the shooting mode, and the second driving current is the driving current of the light source in the non-shooting mode.

[0201] In a specific embodiment, the light source includes at least a red laser light source, the first driving current includes a first red laser light source driving current, and the second driving current includes a second red laser light source driving current.

[0202] In actual observation, the color of the image captured by the camera device tends to be reddish compared to the image projected by the projector. Therefore, to reduce this color cast, the image captured by the projector in capture mode is set to have a lighter red tint than the image captured in non-capture mode. Accordingly, the driving current of the first red laser light source is lower than the driving current of the second red laser light source.

[0203] In one embodiment, the ratio of the first red laser light source driving current to the second red laser light source driving current is greater than 90% and less than 100%. Exemplarily, the ratio of the first red laser light source driving current to the second red laser light source driving current is 95%.

[0204] The embodiment of the present disclosure also provides a laser projection device display method, as shown in FIG25 , which includes the following steps.

[0205] Step 801: Receive a setting instruction for entering a shooting mode.

[0206] The shooting mode refers to a mode in which the projection image of the projection device is used by the shooting device to shoot. The setting instruction for instructing to enter the shooting mode is the setting instruction for the shooting mode.

[0207] For the specific implementation of the projection setting receiving setting instruction, please refer to the above content and will not be repeated here.

[0208] Step 802: In response to the setting instruction, adjust the driving current of the laser light source corresponding to at least one primary color of the projected image.

[0209] Here, adjusting the driving current of the laser light source corresponding to at least one primary color of the projected image is to switch from driving the light source with the second driving current to driving the light source with the first driving current.

[0210] The disclosed embodiment does not limit the specific direction (such as increase or decrease) of adjusting the driving current of the laser light source corresponding to at least one primary color of the projected image. The specific adjustment method can be determined based on the color cast of the captured image and the transmitted image actually observed.

[0211] In one specific embodiment, the multi-color laser light source includes a red laser light source, and at least one primary color includes red, which is emitted by the red laser light source. In actual observation, the color of the image captured by the camera device tends to be redder than the color of the image projected by the projection device. Therefore, when adjusting the driving current of the laser light source corresponding to the at least one primary color of the projected image, the driving current of the red laser light source can be reduced. This results in the image of the projection device in capture mode having a lighter red color than the image in non-capture mode, and the laser projection device enters capture mode.

[0212] In one embodiment, the ratio of the driving current of the red laser light source in the shooting mode to the driving current in the non-shooting mode is greater than 90% and less than 100%. The driving current of the red laser light source in the shooting mode is the driving current of the first red laser light source, and the driving current of the red laser light source in the non-shooting mode is the driving current of the second red laser light source.

[0213] In a specific embodiment, after the laser projection device enters the shooting mode, the method further includes: receiving a setting instruction instructing to exit the shooting mode; and in response to the setting instruction instructing to exit the shooting mode, reversely adjusting the driving current of the laser light source corresponding to at least one primary color of the projected image.

[0214] When the laser projection device enters and exits shooting mode, the same laser light source can be adjusted in different directions. For example, when entering shooting mode, the driving current of a laser light source is reduced, while when exiting shooting mode, the driving current of the same laser light source is increased. Reversely adjusting the driving current of the laser light source corresponding to at least one primary color of the projected image involves switching from emitting light with a first driving current to emitting light with a second driving current.

[0215] Regarding the specific method of receiving the setting instruction to exit the shooting mode, please refer to the above content and will not be repeated here.

[0216] In one embodiment, the drive current of the laser light source corresponding to at least one primary color of the projected image is reversely adjusted, and the drive current of the red laser light source can be increased. This results in a darker red color in the projected image of the laser projector, while the transmitted image of the laser projector returns to a color suitable for human viewing.

[0217] It should be noted that the laser projection device display method in the embodiments of the present disclosure can also be referred to as a light source driving method. The projection devices in the embodiments of the present disclosure are all laser projection devices. The light sources in the embodiments of the present disclosure are all laser light sources.

[0218] An embodiment of the present disclosure provides a projection device, as shown in Figures 1 to 3 . The projection device includes at least one light source 50. The projection device is configured to: display a current indicator icon corresponding to the at least one light source in response to an icon display instruction, each current indicator icon indicating the driving current of the corresponding light source; receive a current adjustment operation for a target light source among the at least one light source; adjust the driving current of the target light source based on the current adjustment operation, and update the current indicator icon corresponding to the target light source, the updated current indicator icon indicating the adjusted driving current of the target light source; and drive the target light source to emit light using the adjusted driving current.

[0219] In a specific embodiment, the projection device is used to: receive multiple current adjustment operations for a target light source among at least one light source; if no current adjustment operation for the target light source is received again within a target time length after receiving the current adjustment operation for the target light source, then use the adjusted driving current to drive the target light source to emit light.

[0220] In a specific embodiment, the projection device is used to: adjust the driving current of the target light source according to the adjustment step based on each current adjustment operation received; wherein the adjustment step is positively correlated with the target difference, and the target difference is the difference between the maximum driving current and the minimum driving current of the target light source.

[0221] In one embodiment, the current adjustment operation is a voice operation.

[0222] In one specific embodiment, the projection device further includes a light source driving circuit corresponding to at least one light source. The projection device is configured to provide an analog dimming signal to the light source driving circuit corresponding to a target light source based on the adjusted driving current. The analog dimming signal is configured to cause the light source driving circuit to output the adjusted driving current to the target light source based on the analog dimming signal, thereby driving the target light source to emit light.

[0223] In a specific embodiment, there are three light sources, the colors of the three light sources are different from each other, and all of the three light sources are laser light sources.

[0224] The present disclosure also provides a projection device, as shown in Figures 1 to 3 . The projection device includes a light source 50. The projection device is configured to: receive a setting instruction for a shooting mode; in response to the setting instruction, obtain a first driving current for the light source in the shooting mode; and drive the light source to emit light using the first driving current, so that the projection device operates in the shooting mode.

[0225] In one specific embodiment, as shown in FIG11 , the projection device further includes a radar. The projection device is configured to: control the radar to transmit a detection signal and collect an echo signal reflected by a target object through the radar; identify a hand gesture of the target object based on the echo signal; and, if the hand gesture is a first gesture indicating entry into a shooting mode, drive the light source to emit light using a first driving current in the shooting mode, thereby operating the projection device in the shooting mode.

[0226] In a specific embodiment, the projection device is used to: determine point cloud data of the hand based on the echo signal; and determine a hand gesture based on the point cloud data.

[0227] In a specific embodiment, the projection device is used to: perform feature extraction on point cloud data to obtain feature information of the hand, the feature information including: the distance of the hand relative to the radar, the azimuth of the hand relative to the radar, and the movement speed of the hand relative to the radar; and determine the hand gesture based on the feature information.

[0228] In a specific embodiment, the projection device is used to input feature information into a gesture recognition model to obtain a hand gesture output by the gesture recognition model.

[0229] In a specific embodiment, the projection device is also used to: if the hand gesture is a second gesture for exiting the shooting mode, and the projection device is operating in the shooting mode, the second driving current in the non-shooting mode is used to drive the light source to emit light, so that the projection device exits the shooting mode.

[0230] In a specific embodiment, the radar is a millimeter wave radar; and the detection signal is a frequency modulated continuous wave.

[0231] In a specific embodiment, as shown in FIG22 , the projection device is used to: if the first voice instruction received includes a wake-up keyword, perform voice recognition on a second voice instruction received after the first voice instruction; if the second voice instruction is recognized as a voice instruction for instructing to enter a shooting mode, use the first driving current in the shooting mode to drive the light source to emit light, so that the projection device operates in the shooting mode.

[0232] In a specific embodiment, the projection device is also used to: if the second voice command is recognized as a voice command for instructing to exit the shooting mode, and the projection device is operating in the shooting mode, the second driving current in the non-shooting mode is used to drive the light source to emit light, so that the projection device exits the shooting mode.

[0233] The disclosed embodiments further provide a laser projection device. The laser projection device includes laser light sources of multiple colors. The laser projection device is configured to: receive a setting instruction instructing entry into a capture mode, wherein the capture mode refers to a mode in which the laser projection device projects an image for capture by a capture device; and, in response to the setting instruction, adjust a driving current of the laser light source corresponding to at least one primary color of the projected image.

[0234] In one specific embodiment, the plurality of colored laser light sources includes a red laser light source, and the at least one primary color includes red, which is emitted by the red laser light source. When adjusting the driving current of the laser light source corresponding to the at least one primary color of the projected image, the laser projection device is configured to reduce the driving current of the red laser light source.

[0235] In one specific embodiment, after adjusting the driving current of the laser light source corresponding to at least one primary color of the projected image, the laser projection device is further configured to: receive a setting instruction instructing to exit the shooting mode; and in response to the setting instruction instructing to exit the shooting mode, reversely adjust the driving current of the laser light source corresponding to the at least one primary color of the projected image.

[0236] In a specific embodiment, when reversely adjusting the driving current of the laser light source corresponding to at least one primary color of the projected image, the projection device is configured to increase the driving current of the red laser light source.

[0237] Embodiments of the present disclosure provide a projection device. The projection device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the laser projection device display method provided in the above embodiments, such as the method shown in Figures 4, 5, 9, 12, 13, 23, 24, or 25.

[0238] Embodiments of the present disclosure provide a computer-readable storage medium. The computer-readable storage medium stores a computer program that is loaded by a processor and executes the laser projection device display method provided in the above embodiments, such as the method shown in Figures 4, 5, 9, 12, 13, 23, 24, or 25.

[0239] The present disclosure also provides a computer program product containing instructions. When the computer program product is executed on a computer, the computer executes the laser projection device display method provided in the above embodiments, such as the method shown in Figures 4, 5, 9, 12, 13, 23, 24, or 25.

[0240] The above description is merely an exemplary embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. A laser projection device display method, It is characterized in that Applied to a laser projection device, the laser projection device includes a laser light source of multiple colors; the method includes: receiving a setting instruction for entering a shooting mode, wherein the shooting mode refers to a mode in which a projection image of the laser projection device is shot by a shooting device; In response to the setting instruction, the driving current of the laser light source corresponding to at least one primary color of the projected image is adjusted.

2. The method according to claim 1, It is characterized in that The laser light sources of multiple colors include a red laser light source, the at least one primary color includes red, and the red is emitted by the red laser light source; The step of adjusting the driving current of the laser light source corresponding to at least one primary color of the projected image includes: The driving current of the red laser light source is reduced.

3. The method according to claim 1, It is characterized in that After adjusting the driving current of the laser light source corresponding to at least one primary color of the projected image, the method further includes: receiving a setting instruction instructing to exit the shooting mode; In response to the setting instruction indicating to exit the shooting mode, the driving current of the laser light source corresponding to at least one primary color of the projected image is reversely adjusted.

4. The method according to claim 3, It is characterized in that The laser light sources of multiple colors include a red laser light source, the at least one primary color includes red, and the red is emitted by the red laser light source; The reverse adjustment of the driving current of the laser light source corresponding to at least one primary color of the projected image includes: The driving current of the red laser light source is increased.

5. The method according to any one of claims 1 to 4, It is characterized in that The ratio of the driving current of the red laser light source in the shooting mode to the driving current in the non-shooting mode is greater than 90% and less than 100%.

6. The method according to any one of claims 1 to 4, It is characterized in that The laser projection device further includes a radar; the receiving a setting instruction indicating entering a shooting mode includes: Controlling the radar to transmit a detection signal, and collecting an echo signal reflected by a target object through the radar; recognizing a hand gesture of the target object based on the echo signal; If the hand gesture is the first gesture for instructing to enter the shooting mode, it is determined that the setting instruction for instructing to enter the shooting mode is received.

7. The method according to claim 6, It is characterized in that The identifying the hand gesture of the target object based on the echo signal includes: Determine point cloud data of the hand based on the echo signal; A gesture of the hand is determined based on the point cloud data.

8. The method according to claim 7, It is characterized in that The determining the hand gesture based on the point cloud data comprises: Performing feature extraction on the point cloud data to obtain feature information of the hand; wherein the feature information includes the distance of the hand relative to the radar, the azimuth of the hand relative to the radar, and the moving speed of the hand relative to the radar; The hand gesture is determined based on the feature information.

9. The method according to claim 8, It is characterized in that The determining the hand gesture based on the feature information comprises: The feature information is input into a gesture recognition model to obtain the hand gesture output by the gesture recognition model.

10. The method according to claim 6, It is characterized in that The radar is a millimeter wave radar, and the detection signal is a frequency modulated continuous wave.

11. The method according to any one of claims 1 to 4, It is characterized in that The receiving a setting instruction for entering a shooting mode includes: If the received first voice instruction includes a wake-up keyword, performing voice recognition on a second voice instruction received after the first voice instruction; If the second voice instruction is recognized as a voice instruction for instructing to enter the shooting mode, it is determined that the setting instruction for instructing to enter the shooting mode is received.

12. A laser projection device display method, It is characterized in that Applied to a laser projection device, the laser projection device includes at least one laser light source; the method includes: In response to the icon display instruction, displaying current indication icons corresponding to the at least one laser light source one by one, each of the current indication icons being used to indicate a driving current of a corresponding laser light source; receiving a current adjustment operation for a target laser light source among the at least one laser light source; adjusting the driving current of the target laser light source based on the current adjustment operation, and updating the current indication icon corresponding to the target laser light source, wherein the updated current indication icon is used to indicate the adjusted driving current of the target laser light source; The adjusted driving current is used to drive the target laser light source to emit light.

13. The method according to claim 12, It is characterized in that The receiving a current adjustment operation for a target laser light source in the at least one laser light source comprises: receiving a plurality of current adjustment operations for a target laser light source among the at least one laser light source; The step of using the adjusted driving current to drive the target laser light source to emit light comprises: If no current adjustment operation for the target laser light source is received again within a target time period after receiving the current adjustment operation for the target laser light source, the target laser light source is driven to emit light using the adjusted driving current.

14. The method according to claim 13, It is characterized in that The step of adjusting the driving current of the target laser light source based on the current adjustment operation includes: Based on the current adjustment operation received each time, adjusting the driving current of the target laser light source according to the adjustment step length; The adjustment step is positively correlated with the target difference, and the target difference is the difference between the maximum driving current and the minimum driving current of the target laser light source.

15. The method according to claim 12, It is characterized in that The current adjustment operation is a voice operation.

16. The method according to any one of claims 12 to 15, It is characterized in that The laser projection device further includes a light source driving circuit corresponding to the at least one laser light source on a one-to-one basis; the step of using the adjusted driving current to drive the target laser light source to emit light includes: Based on the adjusted driving current, an analog dimming signal is provided to the light source driving circuit corresponding to the target laser light source, and the analog dimming signal is used for the light source driving circuit to output the adjusted driving current to the target laser light source based on the analog dimming signal to drive the target laser light source to emit light.

17. A laser projection device, It is characterized in that The laser projection device comprises laser light sources of multiple colors, and the laser projection device is used for: receiving a setting instruction for entering a shooting mode, wherein the shooting mode refers to a mode in which a projection image of the laser projection device is shot by a shooting device; In response to the setting instruction, the driving current of the laser light source corresponding to at least one primary color of the projected image is adjusted.

18. A laser projection device, It is characterized in that The laser projection device comprises at least one laser light source, and the laser projection device is used for: In response to the icon display instruction, displaying current indication icons corresponding to the at least one laser light source one by one, each of the current indication icons being used to indicate a driving current of a corresponding laser light source; receiving a current adjustment operation for a target laser light source among the at least one laser light source; adjusting the driving current of the target laser light source based on the current adjustment operation, and updating the current indication icon corresponding to the target laser light source, wherein the updated current indication icon is used to indicate the adjusted driving current of the target laser light source; The adjusted driving current is used to drive the target laser light source to emit light.

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