Laser projection device and projection display method

Abstract

Embodiments of the present application relate to the technical field of display. The embodiments of the present application provide a light projection device, a brightness adjustment method, a storage medium, and a program product. The laser projection device comprises: a display screen and a controller connected to the display screen; the display screen is used for displaying pictures; the laser projection device has a plurality of display modes; and the controller is configured to: when the laser projection device is in a first display mode, in response to an adjustment instruction for the first display mode, and / or in response to triggering a second display mode, determine a third display mode from candidate display modes on the basis of the priorities of the display modes; and perform brightness adjustment on the basis of brightness adjustment parameters of the third display mode so as to project and display an image to be displayed on the display screen. In various display mode interaction scenarios, brightness adjustment is performed on the basis of preset priorities of display modes, thereby effectively reducing brightness adjustment conflicts between different display modes, enhancing the accuracy of brightness adjustment, and thus improving the user experience.

Description

Laser projection device and projection display method

[0001] This application claims priority to the Chinese patent application with application number 202410362660.8 filed on March 27, 2024; priority to the Chinese patent application with application number 202410636637.3 filed on May 22, 2024; the entire contents of which are incorporated by reference into this application. Technical Field

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

[0003] With the development of technology, laser TV has been used by more and more users due to its characteristics of true colors and healthy eye protection.

[0004] In related technologies, in order to improve the user experience of laser TVs, a variety of display modes have been developed for laser TVs, such as quiet mode, shooting mode, high-temperature thermal protection mode, human eye protection mode, etc.

[0005] The above modes all involve adjusting the brightness. During the display process of the laser TV, when switching between different display modes or in scenarios where multiple display modes coexist, how to ensure the accuracy of brightness adjustment to prompt the display effect has become a problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0006] In one aspect, a laser projection device is provided, comprising: a display screen and a controller connected to the display screen; the display screen is used for displaying images, the laser projection device has multiple display modes, and the controller is configured to:

[0007] When the laser projection device is in a first display mode, in response to an adjustment instruction for the first display mode, and / or in response to triggering the second display mode, determining a third display mode from candidate display modes according to a priority of the display modes;

[0008] Brightness adjustment is performed according to the brightness adjustment parameters of the third display mode to project and display the image to be displayed on the display screen.

[0009] On the other hand, a projection display method is provided, which is applied to a laser projection device, wherein the laser projection device includes: a display screen and a controller connected to the display screen; the display screen is used for displaying images, and the laser projection device has multiple display modes;

[0010] The method comprises:

[0011] When the laser projection device is in a first display mode, the controller responds to an adjustment instruction for the first display mode and / or responds to triggering the second display mode, and determines a third display mode from candidate display modes according to a priority of the display modes;

[0012] The controller performs brightness adjustment according to the brightness adjustment parameter of the third display mode, so as to project and display the image to be displayed on the display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 is a schematic structural diagram of an existing laser projection device;

[0014] FIG2 is a flowchart of a projection display method according to an embodiment of the present application;

[0015] FIG3 is a second flow chart of a projection display method provided in an embodiment of the present application;

[0016] FIG4 is a first schematic diagram of a display interface for switching display modes provided in an embodiment of the present application;

[0017] FIG5 is a second schematic diagram of a display interface for switching display modes provided in an embodiment of the present application;

[0018] FIG6 is a third schematic diagram of a display interface for switching display modes provided in an embodiment of the present application;

[0019] FIG7 is a first flow chart of a brightness adjustment method provided in an embodiment of the present application;

[0020] FIG8 is a schematic diagram of an interface for entering a high-temperature protection mode provided in an embodiment of the present application;

[0021] FIG9 is a schematic diagram of an interface for selecting a display mode when exiting a high-temperature thermal protection mode according to an embodiment of the present application;

[0022] FIG10 is a schematic diagram of a high-temperature thermal protection mode adjustment provided in an embodiment of the present application;

[0023] FIG11 is a third flow chart of a projection display method provided in an embodiment of the present application;

[0024] FIG12 is a schematic diagram of displaying a first image on a display screen according to an embodiment of the present application;

[0025] FIG13 is a second flow chart of a brightness adjustment method provided in an embodiment of the present application;

[0026] FIG14 is a schematic diagram of an adjustment during the startup phase provided by an embodiment of the present application;

[0027] FIG15 is a flow chart of a method for determining a display mode and setting brightness during startup of a laser projection device provided by an embodiment of the present application;

[0028] FIG16 is a flowchart of a method for adjusting brightness of a laser projection device when switching display modes based on user control after system startup, provided by an embodiment of the present application;

[0029] FIG17 is a schematic diagram of a circuit structure of a laser projection device according to an embodiment of the present application;

[0030] FIG18 is a schematic diagram of a circuit control principle of a laser projection device provided in an embodiment of the present application;

[0031] FIG19 is a schematic diagram of a process of image quality debugging provided by an embodiment of the present application;

[0032] FIG20 is a schematic diagram of a color gamut range provided in an embodiment of the present application;

[0033] FIG21 is a schematic diagram of a color gamut range of divided regions provided in an embodiment of the present application;

[0034] FIG22 is a schematic diagram of a projection interface of a laser projection device provided in an embodiment of the present application;

[0035] FIG23 is a schematic diagram of the circuit control principle of another laser projection device provided in an embodiment of the present application;

[0036] FIG24 is a fourth flow chart of a projection display method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0038] It should be noted that the brief descriptions of terms in this application are only for the purpose of facilitating the understanding of the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their ordinary and usual meanings.

[0039] In addition, the terms "comprises" and "comprising" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components expressly listed but may include other components not expressly listed or inherent to such product or device.

[0040] With the development of technology, laser projection equipment (for example, laser TV) has been used by more and more users due to its characteristics of true color and healthy eye protection.

[0041] To facilitate understanding, the architecture and imaging principles of the laser projection device are first explained as an example.

[0042] Figure 1 is a schematic diagram of the structure of an existing laser projection device. As shown in Figure 1, after the upper shell of the laser projection device is disassembled, the internal structure is divided according to optical functions and can include a light source assembly 100, an optical engine 200, and a projection lens 300.

[0043] Among them, the optical engine 200 may include light modulation components, such as phase modulation devices (PLM) such as light rods and relay lenses, and amplitude modulation devices. Among them, the phase modulation device plays the role of shaping and homogenizing the laser, and the amplitude light modulation component is the core component of the laser projection equipment. The amplitude light modulation component (also called light valve) can be divided into transmissive liquid crystal display (LCD), liquid crystal on silicon (LCOS), and digital micro mirror device (DMD) chip. Among them, the DMD chip is used in the DLP projection architecture.

[0044] The light source assembly 100 is used to provide a light source illumination beam, which is transmitted to the back-end optical modulation device and projection lens. The light source assembly 100 can include at least one color laser, such as a blue laser, or a dual-color laser, such as a blue laser and a red laser. Alternatively, it can be a three-color light source assembly, including red (RED, R), green (Green, G), and blue (Blue, B) lasers, to provide a three-color laser illumination beam.

[0045] In the embodiment of the present application, the light source assembly 100 mainly includes three colors of light source assembly. The yellow color in the projection image can be obtained by mixing red and green lights.

[0046] Take, for example, a three-color light source assembly. Typically, in laser projection devices without a PL (light-emitting diode) (PL), the lasers of the three-color light source assembly sequentially emit RGB colors, which are then sequentially irradiated onto an amplitude modulation device. For example, the amplitude modulation device, a DMD, sequentially receives three display drive signals for the RGB laser beams, aligning with the emission sequence of the three laser beams. The DMD then flips the thousands of tiny mirrors on its surface at positive or negative angles corresponding to the display drive signals, reflecting the laser beams incident on its surface into the projection lens 300. This amplitude modulation then amplitude modulates the laser beams incident on the DMD, achieving projection imaging. In other words, when a red laser beam impinges on the DMD, the DMD amplitude modulates the red laser beam based on the video image signal for the red laser beam, and so on. In this laser projection process, although the three laser beams for a complete image are emitted sequentially, the rapid sequential emission speed and the persistence of vision of the human eye enable the laser projection device to display the projected image.

[0047] The lens 300 may be an ultra-short-throw projection lens, which is used to project an image beam onto a projection screen, thereby realizing a projected image display. The laser projection device in the above example may be an ultra-short-throw laser projection device.

[0048] In a laser projection system with a PLM, the lasers of the three-color light source assembly emit RGB colors sequentially, which are then irradiated onto the PLM in a timed sequence. Similarly, in the same order as the three-color light source assembly emits RGB colors, the PLM sequentially receives three video image signals corresponding to the three-color RGB laser beams and phase-modulates the laser beams irradiating the PLM accordingly. This phase-modulated laser beam is then emitted to the DMD for amplitude modulation, completing the subsequent laser projection steps.

[0049] In related technologies, to further meet the user experience and needs of laser projection equipment, some manufacturers have developed multiple display modes for laser projection equipment, such as quiet mode, shooting mode, high-temperature thermal protection mode, and human eye protection mode. Users can use different display modes for display.

[0050] However, the above display modes all involve brightness adjustment. When switching between different modes or multiple modes coexisting, how to adjust the brightness to avoid brightness adjustment conflicts between different display modes to improve the display effect has become a problem that technical personnel in this field urgently need to solve.

[0051] In view of this, the embodiments of the present application provide a laser projection device, a brightness adjustment method, a storage medium and a program product, which adjust the brightness according to the priority of the preset display mode in each display mode interaction scenario, thereby effectively reducing the brightness adjustment conflict between different display modes and improving the user experience.

[0052] The technical solution of the present application is described in detail below with reference to specific embodiments. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in certain embodiments. In the description of the present application, unless otherwise clearly specified and limited, each term should be understood in a broad sense within the art. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0053] FIG2 is a flow chart of a projection display method according to an embodiment of the present application, which is applied to a laser projection device. The laser projection device includes: a display screen and a controller connected to the display screen; the display screen is used to display images, and the laser projection device has multiple display modes. The embodiment of the present application may be performed by the laser projection device or the controller of the laser projection device. As shown in FIG2 , the method includes the following steps:

[0054] S201 : When the laser projection device is in a first display mode, in response to an operation of adjusting the display mode, determine a third display mode from candidate display modes according to the priority of the display modes.

[0055] In some embodiments, the display mode of the laser projection device includes but is not limited to one or more of a quiet mode, a photo mode, a standard mode, a high temperature thermal protection mode, a human eye protection mode, and a high and low dynamic mode, wherein the standard mode can be the default display mode of the laser projection device.

[0056] Among them, the quiet mode is used to instruct the heat dissipation device of the laser projection equipment to enter the noise reduction mode; the photo mode is used to instruct the laser of the laser projection equipment to gain red brightness; the high-temperature thermal protection mode is used to instruct the laser of the laser projection equipment to cool down; the human eye protection mode is used to instruct the laser projection equipment to perform human eye protection operation.

[0057] In some embodiments, a heat dissipation device (e.g., a fan) entering a noise reduction mode may mean that the speed of the heat dissipation device is reduced to reduce noise. A laser projection device (taking RGB lasers as an example) performing a red brightness gain may mean increasing the brightness of the red (R) laser.

[0058] In some embodiments, the priorities of the human eye protection mode, the high temperature thermal protection mode, the photographing mode, the quiet mode, the high and low dynamic modes, and the standard mode are reduced in sequence.

[0059] In the present application, responding to an operation of adjusting the display mode includes responding to an adjustment instruction for the first display mode, and / or responding to triggering the second display mode.

[0060] In some embodiments, the first display mode may be a display mode determined when the laser projection device is started (also known as power-on initialization). For example, the first display mode may be the display mode the laser projection device was in when it was last shut down. In response to an instruction to adjust the first display mode, and / or in response to triggering the second display mode, the operation may be executed after the laser projection device system is started.

[0061] In some embodiments, the first display mode may be any display mode available in the laser projection device, or the first display mode may include two or more display modes, for example, the first display mode may be both a quiet mode and a photo taking mode. The second display mode may include the eye protection mode and the high temperature protection mode, and the candidate display mode may include any display mode available in the laser projection device.

[0062] In some embodiments, responding to an instruction to adjust the first display mode may be responding to an instruction sent by a user to adjust the display mode of the laser projection device via a control device, such as an instruction to turn off the first display mode or switch to a new display mode. Responding to triggering the second display mode may refer to the laser projection device meeting a triggering condition for the second display mode, such as the laser projection device's temperature being too high, proactively triggering a high-temperature protection mode.

[0063] In some embodiments, in response to an adjustment instruction for the first display mode, the laser projection device can determine the third display mode from the candidate display modes based on the priority of the display mode. For example, when the adjustment instruction is to turn off the first display mode, the laser projection device can use a display mode with a lower priority than the first display mode as a candidate display mode, and determine the third display mode from the candidate display modes based on the user's instruction.

[0064] Alternatively, when the adjustment instruction is to turn on the fourth display mode, the laser projection device may use the first display mode and the fourth display mode as candidate display modes, and determine whether to use the first display mode or the fourth display mode as the third display mode based on the priority of the first display mode and the fourth display mode. If the fourth display mode has a higher priority, the fourth display mode is used as the third display mode.

[0065] In some embodiments, in response to triggering the second display mode, the laser projection device may use the second display mode and the first display mode as candidate display modes, and determine whether to use the first display mode or the second display mode as the third display mode based on the priority of the first display mode and the second display mode. For example, if the second display mode has a higher priority, the second display mode will be used as the third display mode.

[0066] S202: Perform brightness adjustment according to the brightness adjustment parameters of the third display mode to project the image to be displayed on the display screen.

[0067] In some embodiments, when the laser projection device determines the third display mode, the current brightness can be adjusted according to the brightness adjustment parameters of the third display mode, for example, the current brightness is set to the preset brightness corresponding to the third display mode.

[0068] In an embodiment of the present application, when the controller determines that the preset brightness is the current brightness, the preset brightness can be sent to the display control module, and the display control module controls the display of the image to be displayed according to the preset brightness.

[0069] The projection display method provided in the embodiment of the present application adjusts brightness according to the priority of the preset display mode in each display mode interaction scenario, thereby effectively reducing the brightness adjustment conflict between different display modes and improving the user experience.

[0070] Based on the above embodiment, the process of determining the third display mode from the candidate display modes according to the priority of the display modes in response to the adjustment instruction of the first display mode is described in detail below.

[0071] FIG3 is a second flow chart of a projection display method provided in an embodiment of the present application, as shown in FIG3 , including:

[0072] S301 , determining the type of the adjustment instruction. If the adjustment instruction is to turn off the first display mode, executing step S302 ; if the adjustment instruction is to turn on the fourth display mode, executing step S305 .

[0073] S302: In response to a closing instruction for the first display mode, select a display mode with a lower priority than the first display mode as the candidate display mode.

[0074] The instruction to close the first display mode may refer to only closing the first display mode, and does not include instructions to open and switch other display modes.

[0075] In some embodiments, when the first display mode includes at least two display modes that are simultaneously enabled, the instruction to disable the first display mode may be to disable all enabled display modes simultaneously, or to disable any one of the display modes. When disabling any display mode, the laser projection device may display all enabled display modes on the display interface and determine the display mode to be disabled based on the user's selection instruction.

[0076] In some embodiments, if the first display mode is a display mode, the laser projection device may use a display mode with a lower priority than the first display mode as the candidate display mode. For example, if the first display mode is a photo mode, then according to the priority, the candidate display modes include quiet mode, high and low dynamic mode, and standard mode.

[0077] If the first display mode includes at least two display modes, and the shutdown instruction is to turn off one of the display modes, the laser projection device can use the display mode with a priority lower than the first display mode, including the display mode with the highest priority among the at least two display modes, as the candidate display mode. For example, the first display mode is the photo mode and the quiet mode, and the shutdown instruction is to turn off the photo mode. Then, based on the priority, the display mode with a priority lower than the photo mode can be used as the candidate display mode, that is, the candidate display modes include the quiet mode, the high and low dynamic mode, and the standard mode.

[0078] In some embodiments, if the first display mode includes at least two display modes and the shutdown instruction is to shut down one of the display modes, the laser projection device may select the remaining display modes as candidate display modes, or select the display mode with the lowest or highest priority as the candidate display mode. For example, if the first display mode includes a photo mode and a quiet mode, and the shutdown instruction is to shut down the photo mode, the candidate display mode is the quiet mode.

[0079] S303: When there are at least two candidate display modes, display the candidate display modes.

[0080] S304: In response to a user instruction, determine the third display mode from the candidate display modes and enter the third display mode.

[0081] In some embodiments, if the candidate display modes include multiple display modes, the laser projection device may display the candidate display modes on a display screen to prompt the user to select a display mode. Upon receiving the candidate display mode selected by the user, the laser projection device may use the candidate display mode as the third display mode, enter or switch to the third display mode, and adjust the current brightness to the brightness corresponding to the third display mode.

[0082] FIG4 is a first schematic diagram of a display interface for switching display modes provided in an embodiment of the present application.

[0083] In Figure 4 , the first display mode is taken as display mode 1. As shown in Figure 4 (a), in response to a shutdown instruction for the first display mode, i.e., display mode 1, candidate display modes are determined to include display mode 3, display mode 5, and display mode 6 based on the priority, and the interface shown in Figure 4 (b) may be displayed.

[0084] As shown in (b) of FIG. 4 , in response to the user's selection operation on display mode 5 , the laser projection device may set display mode 5 as the third display mode and enter or switch to display mode 5 , as shown in (c) of FIG. 4 .

[0085] In some embodiments, if the candidate display modes include only one display mode, the laser projection device can directly enter the display mode and adjust the current brightness to the brightness corresponding to the display mode.

[0086] As shown in FIG4 , if the candidate display mode is only display mode 5, the corresponding interface display process may be to directly display the interface shown in FIG4 (c) after FIG4 (a).

[0087] In some embodiments, if the first display mode is the display mode with the lowest priority, when receiving the user's shutdown instruction, the laser projection device can display a prompt message on the display screen saying "No display mode can be switched, please select the display mode you want to turn on."

[0088] FIG5 is a second schematic diagram of a display interface for switching display modes provided in an embodiment of the present application. As shown in FIG5 , taking display mode 1 as the first display mode, as shown in FIG5 (a), in response to a shutdown instruction for the first display mode, i.e., the display mode, if display mode 1 is the display mode with the lowest priority, an interface as shown in FIG5 (b) may be displayed, displaying a prompt message “No display mode can be switched, please select the display mode to be turned on”.

[0089] As shown in (b) of FIG. 5 , the user can select a display mode to be turned on from display mode 2 , display mode 3 , display mode 4 , display mode 5 , and display mode 6 .

[0090] It is understandable that different display modes correspond to multiple brightness levels. After the laser projection device adjusts the brightness, the user can also adjust the current brightness by himself.

[0091] S305. Determine the priority of the first display mode and the fourth display mode. If the priority of the first display mode is higher than the priority of the fourth display mode, execute step S306. If the priority of the first display mode is lower than the priority of the fourth display mode, execute step S307.

[0092] S306: Use the fourth display mode as the third display mode and enter the fourth display mode.

[0093] In some embodiments, when the user's adjustment instruction is to turn on the fourth display mode, the display device can switch the display mode from the first display mode to the fourth display mode. If the fourth display mode has a higher priority than the first display mode, the laser projection device uses the fourth display mode as the candidate mode. In this case, there is only one candidate mode, and the fourth display mode is the third display mode described above. The laser projection device can enter the fourth display mode and adjust the brightness based on the brightness adjustment parameters of the fourth display mode to project the image to be displayed on the display screen. For example, the current brightness is adjusted to the preset brightness corresponding to the fourth display mode.

[0094] Figure 6 is a third schematic diagram of a display interface for switching display modes provided in an embodiment of the present application. In Figure 6 , the first display mode is Mode 1 and the fourth display mode is Mode 4 as an example.

[0095] As shown in (a) in Figure 6, in response to the user's operation of switching the display mode, the interface shown in (b) in Figure 6 can be displayed, which includes user-selectable display mode 2, display mode 3, display mode 4, display mode 5 and display mode 6.

[0096] As shown in FIG6(b), in response to the user's selection operation of display mode 4, the laser projection device can set display mode 4 as the third display mode and enter display mode 4, as shown in FIG4(c).

[0097] S307, determine whether the current brightness is greater than the preset brightness, if the current brightness is less than the preset brightness, execute step S308, if the current brightness is greater than or equal to the preset brightness, execute step S309.

[0098] In some embodiments, the preset brightness may refer to the brightness determined based on prior knowledge, for example, the brightness corresponding to the preset brightness SSI_down_level. Alternatively, the preset brightness is a brightness value determined based on the average of the highest brightness of each display mode, and the brightness is relatively soft and not dazzling in each display mode. Optionally, different display modes also have their own corresponding preset brightness, and the preset brightness corresponding to each display mode itself may be different from or the same as the aforementioned brightness. Optionally, the preset brightness corresponding to each display mode may be the default brightness when switching to that display mode. Accordingly, each display mode may also have multiple brightness levels, and the user may adjust the brightness based on its corresponding preset brightness, for example, raising or lowering the corresponding preset brightness by one or more brightness levels.

[0099] S308: Enter the fourth display mode, and perform brightness adjustment based on the brightness adjustment parameters of the fourth display mode to project the image to be displayed on the display screen.

[0100] S309 , entering the fourth display mode, and performing brightness adjustment based on the brightness adjustment parameters of the first display mode, so as to project and display the image to be displayed on the display screen.

[0101] In some embodiments, if the fourth display mode has a lower priority than the first display mode, the display mode determines which brightness adjustment parameter to use based on the relationship between the current brightness and the preset brightness. If the current brightness is less than the preset brightness, the fourth display mode is entered, and brightness adjustment is performed based on the brightness adjustment parameters of the fourth display mode to project the image to be displayed on the display screen. If the current brightness is greater than the preset brightness, indicating that the current brightness is too high, to reduce the impact of the significant brightness changes caused by mode switching on the user experience, the laser projection device can enter the fourth display mode and adjust the brightness based on the brightness adjustment parameters of the first display mode to project the image to be displayed on the display screen.

[0102] In some embodiments, after the laser projection device adjusts the brightness based on the brightness adjustment parameters of the first display mode, the laser display device can adjust the current brightness level to the preset brightness corresponding to the fourth display mode again, or maintain the current brightness.

[0103] The projection display method provided in the embodiment of the present application adjusts the brightness according to the priority of the preset display mode in each display mode interaction scenario, and interacts with the user through the interface, thereby effectively reducing the brightness adjustment conflict between different display modes, thereby improving the user experience.

[0104] In some embodiments, the first display mode may include all display modes of the laser projection device. In the first display mode, when it is detected that the trigger condition for the second display mode is met, if the priority of the second display mode is higher than that of the first display mode, the second display mode is used as the third display mode. For example, if the first display mode is the quiet mode and the second display mode is the high-temperature thermal protection mode, the laser projection device directly enters the high-temperature thermal protection mode. If the priority of the second display mode is lower than that of the first display mode, the first display mode is used as the third display mode. For example, if the first display mode is the human eye protection mode and the second display mode is the high-temperature thermal protection mode, the laser projection device directly enters the human eye protection mode.

[0105] In some embodiments, when the first display mode does not include a display mode corresponding to the second display mode (for example, a non-high temperature protection mode and a human eye protection mode), upon detecting that the second display mode is triggered, the laser projection device directly switches to the second display mode.

[0106] It is understandable that the laser projection device detects whether the second display mode meets the trigger condition, which can be performed in any display mode.

[0107] Based on the above embodiments, the processes of the high temperature protection mode and the human eye protection mode are further introduced below.

[0108] FIG7 is a flowchart of a brightness adjustment method according to an embodiment of the present application. As shown in FIG7 , the method includes:

[0109] S701: Monitor the temperature of the laser projection device.

[0110] In some embodiments, monitoring the temperature of the laser projection device may refer to monitoring the temperature of any laser of the laser projection device, or monitoring the temperatures of all lasers (eg, the average temperature of RGB lasers).

[0111] S702: If the temperature is greater than a first preset temperature, trigger a high-temperature thermal protection mode.

[0112] When the temperature of the laser projection device exceeds a first preset temperature, it can be determined that the temperature of the laser projection device is high, posing a risk of component burnout, and a high-temperature thermal protection mode is triggered to reduce the temperature of the laser projection device. The first preset temperature may be a value determined based on a priori knowledge and is not limited in this embodiment of the present application.

[0113] In some embodiments, when monitoring the temperature of the laser projection device to be greater than a first preset temperature, if the duration is greater than or equal to a preset time length, it can be determined that the temperature of the laser projection device is high and there is a risk of burning the device, and a high-temperature thermal protection mode is triggered. If the duration is less than the preset time length, the current display mode is maintained.

[0114] In some embodiments, triggering the high temperature protection mode can prompt the user through the display screen. As shown in Figure 8, Figure 8 is a schematic diagram of an interface for entering the high temperature protection mode provided in an embodiment of the present application.

[0115] As shown in FIG8 , when the high-temperature thermal protection mode is triggered, the text “The current device temperature is high, and the high-temperature thermal protection mode has been turned on” may be displayed on the display screen to prompt the user.

[0116] S703: Reduce the brightness of the laser projection device.

[0117] When entering high-temperature thermal protection mode, the laser projection device can reduce the current brightness by a target brightness, completing the first brightness adjustment. For example, the brightness can be reduced by 100 candelas / square meter. The target brightness can be a value determined based on prior knowledge and is not limited in this embodiment of the application.

[0118] In some embodiments, when reducing the current brightness, the laser projection device may also adjust the rotation speed of the heat dissipation device to the maximum rotation speed.

[0119] In some embodiments, as shown in FIG10 , if the laser projection device is in the photography mode before the high-temperature thermal protection mode is triggered, and after entering the high-temperature thermal protection mode, if the speed of the heat sink is at the highest speed, since the photography mode will accelerate the temperature rise of the laser projection device, in order to quickly reduce the temperature of the laser projection device, the laser projection device exits the photography mode, selects a corresponding display mode based on the current brightness, and adjusts the brightness based on the selected display mode, which is the first brightness adjustment. For example, if the current brightness is greater than the first preset brightness corresponding to the high-temperature thermal protection mode, the device enters the quiet mode and adjusts the brightness to the preset brightness corresponding to the quiet mode. If the current brightness is less than or equal to the preset brightness, the device enters the standard mode and adjusts the brightness to the preset brightness corresponding to the standard mode.

[0120] In some embodiments, after completing the first brightness adjustment, the laser projection device may set the corresponding brightness adjustment flag to a preset value, for example, set the brightness adjustment flag to 2.

[0121] S704: After a preset time, if the temperature is greater than a second preset temperature, reduce the brightness of the laser projection device again.

[0122] The laser projection device can continuously monitor the temperature of the laser. If, after the first brightness adjustment, the laser temperature remains above a second preset temperature within a preset time, it indicates that further temperature reduction is required. The laser projection device can then further reduce the current brightness by a target brightness or another brightness level to complete the second brightness adjustment. For example, the brightness may be further reduced by 100 cd / m². The second preset temperature is greater than the first preset temperature.

[0123] In some embodiments, after the second brightness adjustment or the first brightness adjustment, if the temperature of the laser is less than a first preset temperature after a preset time, the high-temperature thermal protection mode is exited. When exiting the high-temperature thermal protection mode, the laser projection device may enter a preset display mode (e.g., quiet mode or standard mode); or the display mode that was in before entering the high-temperature thermal protection mode; or the user may be prompted to select a desired display mode via the display screen.

[0124] FIG9 is a schematic diagram of an interface for a user to select a display mode when exiting a high-temperature thermal protection mode, provided in an embodiment of the present application.

[0125] As shown in Figure 9, when the laser projection device exits the high heat protection mode, the display screen displays the options of display mode 1, display mode 2, display mode 3, display mode 4, display mode 5, and display mode 6. The user can select the display mode after exiting the high heat protection mode on this interface.

[0126] In some embodiments, the high-temperature thermal protection mode adjustment can be seen in Figure 10, which is a schematic diagram of a high-temperature thermal protection mode adjustment provided in an embodiment of the present application. As shown in Figure 10, after completing the first brightness adjustment, the laser projection device continuously monitors the temperature of the laser. If the temperature is greater than or equal to the first preset temperature, and the brightness adjustment flag indicates that the first brightness adjustment has been completed, the laser projection device enters the second brightness adjustment process. If the current temperature is greater than the second preset temperature and the speed of the heat dissipation device is the highest speed, subsequent brightness adjustments are performed based on the relationship between the current brightness and the second preset brightness of the high-temperature thermal protection mode. For example, if the current brightness is less than or equal to the second preset brightness, the current brightness is adjusted to the corresponding preset brightness in the standard mode to complete the second brightness adjustment; if the current brightness is greater than the second preset brightness, the current brightness adjustment is reduced by a target brightness or other brightness to complete the second brightness adjustment.

[0127] In some embodiments, after completing the second brightness adjustment, the laser projection device may set the corresponding brightness adjustment mark to a corresponding preset value, for example, set the brightness adjustment mark to 3.

[0128] In some embodiments, after completing the second brightness adjustment, in the high temperature protection mode, if the laser projection device receives a brightness adjustment instruction from the user, in order to reduce the risk of burning the device, the laser projection device may not respond to the user's brightness adjustment instruction.

[0129] In some embodiments, in the high temperature protection mode, the laser projection device may not respond to a user's brightness adjustment instruction.

[0130] In some embodiments, after completing the second brightness adjustment, if the temperature of the laser projection device is still greater than the first preset temperature after a preset time, the laser projection device can prompt the user through the display screen that the current temperature is too high. In order to reduce the risk of burning the device, it is necessary to shut down and cool it down.

[0131] FIG11 is a third flow chart of a projection display method provided in an embodiment of the present application, as shown in FIG11 , including:

[0132] S1101: When it is detected that the user is in the first area, trigger the human eye protection mode.

[0133] In some embodiments, the laser projection device can use configured sensors (for example, lidar, infrared sensor, etc.) to obtain the user's position. When it is determined based on the user's position that the user is in the first area (for example, the distance from the laser is less than a preset distance), the laser emitted by the laser may cause damage to the user's eyes, and the laser projection device triggers the human eye protection mode.

[0134] S1102: Display a first picture on a display screen, where the first picture is used to prompt the user to leave the first area.

[0135] In some embodiments, when a user enters the first area, the laser projection device can control the display screen to display a first image that prompts the user to stay away from the light source (the first area). Optionally, the first image can overlay the currently displayed image, or the first image can be displayed in the form of a floating window.

[0136] FIG12 is a schematic diagram of displaying a first image on a display screen according to an embodiment of the present application.

[0137] As shown in FIG12 , when the laser projection device enters the eye protection mode, the first image is displayed in a floating window. Specifically, the text "Your current location may cause damage to your eyes. Eye protection mode has been entered. Please move away from your current location as soon as possible" can be displayed on the display screen to prompt the user to leave the first area.

[0138] S1103: Turn off the laser of the laser projection device after a preset time.

[0139] In some embodiments, when the human eye protection mode is triggered, the laser projection device may start a timer, the duration of the timer being a preset time, and turn off the laser of the laser projection device after the timer times out.

[0140] In some embodiments, the laser projection device can start the timer and display the first image on the display screen at the same time, or the timer can be started first and then the first image can be displayed on the display screen. This embodiment of the present application is not limited to this.

[0141] S1104: When it is detected that the user leaves the first area, exit the human eye protection mode, and adjust the brightness based on the first display mode to project the image to be displayed on the display screen.

[0142] In some embodiments, the laser projection device can continuously monitor the user's location. If the user leaves the first area, the laser projection device exits the eye protection mode and restores the display mode before the eye protection mode is activated, for example, to the first display mode. Optionally, when resuming to the first display mode, the brightness of the first display mode can be set to a preset brightness corresponding to the first display mode, or the brightness of the first display mode can be set to the brightness before entering the eye protection mode.

[0143] In some embodiments, after exiting the eye protection mode, if the first display mode is the photo mode, the photo mode is exited and a determination is made as to whether the brightness adjustment in the high-temperature thermal protection mode or the quiet mode has been performed. If the brightness adjustment in the high-temperature thermal protection mode or the quiet mode has not been performed, the brightness of the laser projection device may be set to the preset brightness in the standard mode. If the brightness adjustment in the high-temperature thermal protection mode or the quiet mode has been performed, the laser projection device may be set to the brightness after the quiet or high-temperature thermal protection mode has been activated.

[0144] The above describes the human eye protection mode and high temperature thermal protection mode provided in the embodiments of the present application. The following describes the photo mode and quiet mode.

[0145] In some embodiments, when entering quiet mode, the laser projection device may prompt the user through the display screen. In response to the user's confirmation of entering quiet mode, the device enters quiet mode and sets the brightness to a preset brightness corresponding to quiet mode. If the user chooses not to enter quiet mode, the brightness setting may be performed according to standard mode. Optionally, if the user does not confirm when prompted through the display screen, quiet mode may be automatically entered. Optionally, the user may choose not to be prompted again after entering quiet mode.

[0146] In some embodiments, the laser projection device can also automatically enter quiet mode during a preset time period, for example, during a preset nighttime period. When entering quiet mode, the laser projection device enters a low-noise mode (for example, by adjusting the speed of the heat sink to the lowest speed). When the current time reaches a non-preset time period, quiet mode is automatically exited, and the brightness setting corresponding to standard mode can be adjusted.

[0147] In some embodiments, when the laser projection device enters photo mode (e.g., when the camera is detected to be in the state of capturing images / videos), the brightness is set to the preset brightness corresponding to the photo mode and the red brightness gain value of the red laser is adjusted to ensure the captured image has normal color. When exiting photo mode, the brightness is set to the brightness corresponding to the display mode before entering photo mode.

[0148] The following describes the process of determining the first display mode during the startup phase of the laser TV in conjunction with FIG13 .

[0149] FIG13 is a second flow chart of the brightness adjustment method provided in an embodiment of the present application, as shown in FIG7 , including:

[0150] S1301. During startup, determine a first display mode of the laser projection device according to a display mode memorized by the laser projection device.

[0151] Among them, the display modes that the laser projection device can memorize can be the display modes that some laser projection devices have, such as high-temperature thermal protection mode, photo mode, quiet mode, standard mode, high and low dynamic modes, etc.

[0152] In some embodiments, the laser projection device may determine the first display mode based on the display mode the laser projection device was in when it was last shut down and the display modes that the laser projection device can remember.

[0153] For example, as shown in Figure 14, after powering on, it is determined whether the last shutdown was in high-temperature thermal protection mode. If yes, the first display mode is high-temperature thermal protection mode. If no, it is determined whether the last shutdown was in photo mode (calling up the camera / video mode). If yes, the first display mode is photo mode. If no, it is determined whether the last shutdown was in quiet mode; if yes, the first display mode is quiet mode. If no, it is determined whether the last shutdown was in high-low dynamic mode; if yes, the first display mode is high-low dynamic mode. If no, it is determined whether the last shutdown was in high-low dynamic mode.

[0154] S1302: Setting the brightness of the laser projection device according to the brightness adjustment parameter corresponding to the first display mode.

[0155] When determining the first display mode, the brightness of the laser projection device may be set to a preset brightness corresponding to the first display mode.

[0156] In some embodiments, the laser projection device may have two display modes turned on at the same time when it was last shut down, for example, the photo mode and the quiet mode were turned on at the same time. If the laser projection device had two display modes turned on at the same time when it was last shut down, the same two display modes as the last time it was turned off can also be turned on at the same time after it is turned on this time.

[0157] In some embodiments, if two display modes are enabled simultaneously, the laser projection device may not respond to user brightness adjustments after system startup. Optionally, when two display modes are enabled and a user brightness adjustment instruction is received, the display screen may prompt the user. For example, a prompt message may be displayed stating, "Currently in two display modes, brightness adjustment is unavailable. If brightness adjustment is required, please disable one display mode."

[0158] Based on the above embodiments, the detailed processes of the laser projection device during the startup phase and the switching of display modes after the system is started are respectively introduced in conjunction with FIG. 15 and FIG. 16 .

[0159] FIG15 is a flow chart of a method for determining a display mode and setting brightness during the startup phase of a laser projection device provided by an embodiment of the present application, as shown in FIG15 :

[0160] During the startup initialization phase, if it is determined that the last shutdown was in photo mode, and if the quiet mode was turned on at the same time, if the quiet mode is turned on at the same time, then the display mode in which both the photo mode and the quiet mode are turned on is entered, the current brightness is set to the preset brightness, that is, the brightness is set to L1, and the startup is completed.

[0161] During the initialization phase, if it is determined that the last shutdown was in photo mode, and if the quiet mode was turned on at the same time, if the quiet mode was not turned on at the same time, then the photo mode is entered, the preset brightness corresponding to the photo mode is determined, the current brightness is set to the preset brightness corresponding to the photo mode, and the startup is completed.

[0162] During the initialization phase, if it is determined that the last shutdown was in quiet mode, determine whether the brightness at the time of the last shutdown is less than the preset brightness in quiet mode, that is, determine whether it is ≤L1 brightness. If so, enter quiet mode and set the current brightness to the preset brightness in standard mode; if not, enter quiet mode and set the current brightness to the preset brightness in quiet mode, and the startup is completed.

[0163] During the initialization phase, if it is determined that the last shutdown was in standard mode, enter the standard mode, set the current brightness to the preset brightness in the standard mode, and the startup is completed.

[0164] FIG16 is a flow chart of a method for adjusting brightness of a laser projection device when switching display modes based on user control after system startup, provided in an embodiment of the present application.

[0165] As shown in Figure 16, after the system is started, the system is started and the display mode and brightness determined at the system start-up are used for display. The following describes the brightness adjustment logic when the display mode is switched based on user control in different display modes after the system is started.

[0166] When the first display mode is simultaneously enabled for photo mode and quiet mode, after the system is started, if quiet mode is disabled (the quiet mode disabled flag is set), quiet mode is disabled, photo mode is entered, the photo mode brightness adjustment flag is set, and the photo mode brightness gain is adjusted, i.e., red brightness gain is adjusted in photo mode. Thereafter, if photo mode is disabled (the photo mode disabled flag is set), the user is prompted via the display screen to select a display mode. If quiet mode is selected, quiet mode is entered, and the fan of the laser projection device enters noise reduction mode. If the current brightness is less than or equal to the preset brightness in quiet mode, the current brightness is adjusted to the preset brightness in standard mode; if the current brightness is greater than the preset brightness in quiet mode, the current brightness is adjusted to the preset brightness in quiet mode. After entering quiet mode, if photo mode is enabled (the photo mode enabled flag is set), photo mode is entered, the current brightness is adjusted to the preset brightness corresponding to photo mode, and red brightness gain is adjusted.

[0167] When the first display mode is the photo mode and quiet mode turned on simultaneously, after the system is started, if the photo mode is turned off (the photo mode off flag is set), the system enters quiet mode, and the fan of the laser projection device enters noise reduction mode. If the current brightness is less than or equal to the preset brightness in quiet mode, the current brightness is adjusted to the preset brightness in standard mode; if the current brightness is greater than the preset brightness in quiet mode, the current brightness is adjusted to the preset brightness in quiet mode. After entering quiet mode, if the photo mode is turned on (the photo mode on flag is set), the system enters photo mode, adjusts the current brightness to the preset brightness corresponding to the photo mode, and performs red brightness gain adjustment.

[0168] When the first display mode is photo mode, after the system is started, if in response to turning on quiet mode (setting the quiet mode on flag), photo mode and quiet mode are turned on simultaneously, the photo mode brightness adjustment flag is set, and the red brightness gain adjustment is performed. If in response to turning off photo mode (setting the photo mode off flag), the system enters quiet mode, and the fan of the laser projection device enters noise reduction mode. If the current brightness is less than or equal to the preset brightness in quiet mode, the current brightness is adjusted to the preset brightness in standard mode; if the current brightness is greater than the preset brightness in quiet mode, the current brightness is adjusted to the preset brightness in quiet mode. After entering quiet mode, if in response to turning on photo mode (setting the photo mode on flag), the system enters photo mode, adjusts the current brightness to the preset brightness corresponding to photo mode, and performs red brightness gain adjustment.

[0169] When the first display mode is the photo mode, after the system is started, if the photo mode is turned off (the photo mode off flag is set), the user is prompted to select a display mode through the display screen. If the quiet mode is selected, the system enters the quiet mode, and the fan of the laser projection device enters the noise reduction mode. If the current brightness is less than or equal to the preset brightness in the quiet mode, the current brightness is adjusted to the preset brightness in the standard mode; if the current brightness is greater than the preset brightness in the quiet mode, the current brightness is adjusted to the preset brightness in the quiet mode. If the standard mode is selected, the system enters the standard mode, and the brightness is set to the preset brightness in the standard mode. After entering the quiet mode, if the photo mode is turned on (the photo mode on flag is set), the system enters the photo mode, adjusts the current brightness to the preset brightness corresponding to the photo mode, and adjusts the red brightness gain.

[0170] When the first display mode is quiet mode, after the system starts, if in response to turning off quiet mode (setting the quiet mode off flag), the fan exits the noise reduction mode; if the current brightness is less than or equal to the preset brightness in quiet mode, then enter standard mode and adjust the brightness to the preset brightness in standard mode; if the current brightness is greater than the preset brightness in quiet mode, then enter standard mode, and enter the quiet mode slow-down brightness setting, with the preset brightness as the reduction amplitude, perform multiple brightness reductions, and adjust the brightness to the preset brightness in standard mode (slow-down brightness setting to prevent sudden and large changes in brightness, giving the user a poor experience). After entering standard mode, in response to turning on photo mode (setting the photo mode on flag), enter photo mode, and adjust the current brightness to the preset brightness corresponding to the photo mode, and perform red brightness gain adjustment. Alternatively, after entering standard mode, in response to turning on quiet mode (setting the quiet mode on flag), the fan enters noise reduction mode; if the current brightness is less than or equal to the preset brightness in quiet mode, then enter quiet mode and adjust the brightness to the preset brightness in standard mode; if the current brightness is greater than the preset brightness in quiet mode, then enter quiet mode and enter the quiet mode slow brightness setting to increase the brightness multiple times with the preset brightness as the increase amplitude, and adjust the brightness to the preset brightness in quiet mode.

[0171] When the first display mode is standard mode, after the system starts up, if the quiet mode is turned on (the quiet mode on flag is set), the fan enters the noise reduction mode; if the current brightness is less than or equal to the preset brightness in quiet mode, the system enters quiet mode and adjusts the brightness to the preset brightness in standard mode; if the current brightness is greater than the preset brightness in quiet mode, the system enters quiet mode and increases the brightness multiple times by the preset brightness increment until the brightness is adjusted to the preset brightness in quiet mode. If the photo mode is turned on (the photo mode on flag is set), the system enters photo mode and adjusts the current brightness to the preset brightness corresponding to the photo mode, and also adjusts the red brightness gain.

[0172] To summarize, the brightness adjustment method provided in the embodiment of the present application is that when the laser projection device has multiple display modes, in the scenario where the display modes interact, the brightness adjustment of each display mode is carried out in an orderly manner according to the specific scenario, and at the same time, a pop-up box on the corresponding interface prompts the user whether to choose to enter the mode, thereby effectively reducing the probability of poor screen display due to brightness adjustment conflicts, the probability of protection failure due to overheating and burning out the laser and affecting the heat dissipation performance of the entire machine, and the probability of harm to the user when the user is close to the laser projection device, thereby effectively improving the user experience.

[0173] In combination with the above embodiments, the following describes a process of performing brightness adjustment according to the brightness adjustment parameters of the display mode to project an image to be displayed on a display screen.

[0174] Based on the laser projection device structure illustrated in FIG1 , FIG17 is a schematic diagram of a circuit architecture of a laser projection device according to an embodiment of the present application.

[0175] As shown in Figure 17, the laser projection device includes: a display panel 001, a power supply board 002, and a TV panel 003. The power supply board 002 is connected to the display panel 001 and the TV panel 003 respectively, and can be used to power various devices or partial modules on the display panel 001 and the TV panel 003. At the same time, it can also power other functional modules in the laser projection device, such as the human eye protection module, fan, WIFI module, etc., to ensure the normal power supply of various parts of the laser projection device. In some specific implementations, a laser drive component can also be provided on the power supply board 002. In Figure 17, the laser drive component can include a laser drive circuit 030. Alternatively, the laser drive circuit 030 can also be provided independently of the power supply board 002.

[0176] TV board 003 is mainly used for decoding external audio and video signals.

[0177] The TV panel 003 is provided with a controller, which can decode data in different data formats into a normalized format and transmit the normalized format data to the display panel 001 via, for example, a connector.

[0178] The controller may be a system on chip (SOC), which is not specifically limited in the embodiments of the present application.

[0179] In an embodiment of the present application, the controller can decode the image to be displayed and identify the content and color of the image to be displayed. For example, the controller can identify text and images in the image.

[0180] The video image signal output by the TV panel 003 is transmitted to the display panel 001 .

[0181] The display panel 001 can be equipped with a Field Programmable Gate Array (FPGA) and an algorithm processing module FPGA for processing input video image signals, such as performing MEMC frequency multiplication or image correction to implement image enhancement functions. The projection display control processing unit 010 is connected to the algorithm processing module FPGA and is used to receive processed video image processing signal data as image data to be displayed. It should be noted that the FPGA is usually provided as an enhancement function module. In some low-cost solutions, this module can also be omitted, and the projection display control processing unit 010 can receive the video image display signal output by the TV panel 003.

[0182] The projection display control processing unit 010 mainly includes a digital light processing chip (DLP) and may also include a driver chip.

[0183] For example, the display control module in the embodiment of the present application may include the algorithm processing module FPGA and the projection display control processing unit 010, or may only include the projection display control processing unit 010, which is not limited in the embodiment of the present application.

[0184] In the DLP control architecture, the light source part needs to cooperate with the working timing of the DLP chip and the light modulation component chip. Specifically, the DLP chip outputs an image enable signal, which can also be called a primary color light enable signal, usually expressed as X_EN, where X is the abbreviation of different primary color lights, and also outputs a brightness adjustment signal, referred to as a PWM signal. Along with the light modulation component's timely adjustment of different primary color image components, the light source part needs to synchronously output the primary color light beams of the corresponding colors. That is, the DLP chip outputs a primary color light enable signal to notify the laser light source to enable the lighting of a light source component of a certain color, and outputs a PWM signal to notify a certain laser in the laser light source to light up at what brightness.

[0185] Corresponding to Figure 17, the projection display control processing unit 010 is used to generate a modulation drive signal for driving the light modulator 011 based on the image signal to be displayed. On the other hand, since the display of the projection image requires the synchronous coordination of the light source beam and the light modulator, the projection display control processing unit 010 also generates a drive signal for driving the light source to emit light. The drive signal can be called an initial drive signal, which includes two specific drive signals: an image enable signal EN and a current PWM signal. Among them, the image enable signal EN is a timing control signal used to coordinate the timing of light output of different colors, and the current PWM signal is a square wave signal used to provide a current signal for lighting the laser.

[0186] Also, in the circuit architecture diagram of the laser projection device shown in FIG17 , the laser driving circuit 030 is used to receive the image enable signal EN and the current PWM signal output by the projection display control processing unit 010 , and specifically control the lighting of the laser 040 in the light source assembly.

[0187] In the figure, the laser 040 can be a laser of one color or a laser of multiple colors. Usually, a corresponding laser driving circuit 030 is provided for each color of the laser.

[0188] In combination with the above embodiments, the process of projecting and displaying the image to be displayed on the display screen includes: the display control module controls the light source component to emit light beams of different colors according to the content of the image to be displayed, the emitted light beams are adjusted by the light modulation component and incident on the lens, and the image is projected and displayed on the projection screen through the lens.

[0189] The light source assembly can be a laser for providing a three-color laser beam. The three-color laser utilizes the residual visual effect of the human eye to adjust the color of the picture by emitting light in different colors at different times. To enhance brightness, two more colors can be emitted simultaneously to achieve color mixing. For example, yellow can be achieved by emitting red and green simultaneously, and as the fourth primary color, the brightness of the white field can be greatly improved.

[0190] When a laser projector displays an image, the display control module performs color matching based on its default color parameters to determine the desired color beam or beams. Based on the matching results, the light source assembly is then controlled to emit the corresponding color beams in different time periods. Laser projectors can project different colors by mixing several different color beams.

[0191] The default color matching of the display control module when it leaves the factory can be determined based on the wavelength of the three-color laser beam. However, in actual use, the wavelengths of the three-color laser beams emitted by different lasers may be different, so there will be a situation where the default color matching parameters of the display control module do not match the wavelength of the laser. Especially in scenes where there are faces in the picture to be displayed, the human eye is more sensitive to the facial color of the person, such as facial color at different brightness, different facial colors of different people, and facial color at different viewing angles. Therefore, when the image to be displayed is an image that includes a face, if the default color matching parameters of the display control module are used to set the yellow light output, the yellow color temperature will deviate from the standard color temperature, resulting in the face of the person appearing red or bluish in the projected picture, making the projected picture effect poor.

[0192] Based on this, the present application considers that the color of a human face is primarily related to yellow. The yellow color coordinates can be determined based on the wavelength of the light beam emitted by the light source assembly in the projection display device, and the yellow color coordinates can be stored in the display control module so that the yellow color coordinates in the display control module match the parameters of the light source assembly. Thus, when the laser projection device displays an image containing a human face, the color of the facial portion can be used to determine the driving signal for driving the light source assembly to emit the light beam based on the pre-stored yellow color coordinates. This allows for better image quality projected using the light beam emitted by the light source assembly, reduces the redness or bluish tint of the face in the projected image, and enhances the image display quality.

[0193] Next, the process of projecting and displaying an image to be displayed including a face image on a display screen is described. FIG18 is a schematic diagram of a circuit control principle of a laser projection device provided in an embodiment of the present application.

[0194] As shown in FIG18 , the controller can send brightness adjustment parameters to the display control module. When the first image to be displayed by the laser projection device includes a human face, the display control module can send a first drive signal to the light source assembly based on the first image to be displayed, pre-stored yellow primary color ratio parameters, and brightness adjustment parameters. The yellow primary color ratio parameters are determined based on yellow color coordinates, which are determined based on the wavelength of the light beam that the light source assembly can emit.

[0195] It should be understood that the brightness adjustment parameter may be a preset brightness corresponding to a certain display mode described in the above embodiment, and specifically, is related to the current mode of the laser projection device.

[0196] In an embodiment of the present application, the first image to be displayed received by the laser projection device may be sent by a controller (not shown in FIG18 ), and the first image to be displayed may be an image signal decoded by the controller. This embodiment of the present application does not specifically limit this.

[0197] According to the above embodiment, the first driving signal may include the emission duration of the primary color light and the PWM signal. Therefore, the primary color light ratio parameters for yellow light pre-stored in the display control module may include the emission duration of the primary color light and the PWM signal corresponding to the yellow light emitted by the light source assembly, which is not specifically limited in this embodiment of the present application.

[0198] It should be understood that the PWM signal is obtained by taking into account the brightness adjustment parameters.

[0199] Because light beams of different wavelengths correspond to different color coordinates, the wavelength of the light beam that the light source assembly can emit can be used to determine the yellow color coordinates corresponding to the light source assembly. These yellow color coordinates can serve as the color coordinates of standard yellow. Because the color of a human face primarily transitions from red to yellow, when projecting an image containing a human face, using these standard yellow color coordinates to determine the primary color ratio parameters of yellow light makes the first drive signal determined based on these primary color ratio parameters more accurate, and the projected facial image more accurately reflects reality.

[0200] When the light source assembly receives the first drive signal, the light source assembly can emit a light beam to the light modulation assembly according to the first drive signal, and the light beam is used for projection display. As in the above embodiment, the first drive signal may include a primary color light enable signal and a PWM signal. The embodiment of the present application does not specifically limit the first drive signal.

[0201] Furthermore, the light beam emitted by the light source assembly is irradiated on the light modulation assembly, which modulates the light beam to obtain a first target light beam. The first target light beam can be incident on the lens, and the lens uses the first target light beam to project a first image on the display screen.

[0202] Exemplarily, the light modulation component may receive a modulation driving signal sent by the display control module, so that the light modulation component may modulate the light beam according to the modulation driving signal.

[0203] Thus, by pre-storing the yellow color coordinates, determined based on the wavelength of the light beam emitted by the light source assembly, in the display control module, the color matching in the display control module is consistent with the parameters of the light source assembly. When displaying a facial image, the display control module can control the light source assembly to emit a light beam based on the standard yellow color coordinates, and modulate the light beam via the light modulation assembly for projection display. Therefore, when adjusting according to the brightness adjustment parameters corresponding to the display mode, not only the brightness adjustment parameters are taken into account, but also the display is performed according to the more standard color coordinates. This makes the projected facial image more consistent with reality, reduces the redness or bluish tint of the face in the displayed image, and improves the display effect of the laser projection device.

[0204] Since the white balance of the projection light source determines the color temperature of the projected image, and color temperature can generally be expressed using color coordinates, in this embodiment of the present application, the display control module may also pre-store white balance primary color ratio parameters. These white balance primary color ratio parameters are determined based on the white balance color coordinates, which are determined based on the wavelength of the light beam that can be emitted by the light source assembly.

[0205] In the above embodiment, the yellow color coordinates used to determine the primary color ratio parameters of yellow light are determined based on the white balance color coordinates and according to the wavelengths of the green primary color light and the yellow primary color wave that can be emitted by the light source assembly.

[0206] It's understandable that the white balance primary color ratio parameters and the yellow light primary color ratio parameters can be determined during the initial image quality adjustment phase of the laser projection device. Only after image quality adjustment is completed can the laser projection device be put into use. The following describes the image quality adjustment process, using a laser light source component that can emit red, green, and blue laser beams as an example.

[0207] FIG19 is a flow chart of a picture quality adjustment process provided by an embodiment of the present application. As shown in FIG19 , picture quality adjustment may include the following three steps:

[0208] S1901: Adjust the ratio of the three primary colors of red, green, and blue to determine the primary color ratio parameters of the white balance color.

[0209] For example, the white balance color coordinates corresponding to the light source assembly can be determined according to the wavelengths of the three primary colors of red, green, and blue. The white balance color coordinates are standard white balance color coordinates.

[0210] FIG20 is a schematic diagram of a color gamut range provided in an embodiment of the present application.

[0211] In Figure 20, the color coordinates (x, y) indicate that the proportion of red light in white light is x, and the proportion of green light in white light is y. R represents the red color coordinate, G represents the green color coordinate, B represents the blue color coordinate, and Y represents the yellow color coordinate. The red color coordinate is determined based on the wavelength of red light, the green color coordinate is determined based on the wavelength of green light, and the blue color coordinate is determined based on the wavelength of blue light. The solid triangle formed by the three points R, G, and B represents the color gamut of the light source component. There is a white balance point at the center of the color gamut, such as point A in Figure 20. The coordinates at this point are the white balance color coordinates.

[0212] According to the white balance color coordinates, by adjusting the primary color matching parameters in the display control module, the proportions of the three primary colors of red, green, and blue are adjusted so that the color coordinates of the white field formed by the light beam emitted by the laser are consistent or close to the white balance color coordinates, and the primary color light matching parameters of the white balance are determined.

[0213] S1902: Determine the yellow color coordinate according to the white balance color coordinate.

[0214] Exemplarily, the white balance color coordinates determined in step 1 are used as a standard. On the basis of the white balance color coordinates, the yellow color coordinates, ie, the standard yellow color coordinates, can be determined.

[0215] Of course, other mixed color coordinates can also be determined by the above method, for example, purple color coordinates can be determined, etc., and this application does not limit this.

[0216] S1903: Adjust the color ratio of the mixed color according to the application scenario, and determine the primary color ratio parameters of the yellow light.

[0217] The application scenario is the scene corresponding to the image to be displayed. In the embodiment of the present application, the application scenario can be a human face scene. In the color gamut diagram shown in Figure 20, the range within the dotted triangle is the color range of the human face. Therefore, when the color ratio parameters of the display control module are inconsistent with the parameters of the laser, when the display control module is used to control the yellow light output, there will be a position where the yellow color coordinates deviate from the standard yellow color coordinates, that is, the yellow color temperature deviates from the standard color temperature, resulting in the face appearing red or bluish.

[0218] In the embodiments of the present application, the laser projection device uses pulsed light modulation to emit red, green, and yellow light in a time-sharing manner, thereby achieving a yellow image visually perceived by the human eye. The display control module controls the laser light emission via a drive signal, which can include the light emission duration and the PWM ratio. When controlling the emission of yellow light, it is necessary to control the simultaneous emission of red and green light through corresponding PWM. The different PWM ratios of red and green will cause the coordinates of yellow on the color gamut diagram to shift, resulting in poor visual effects on human faces.

[0219] Therefore, according to the yellow color coordinates, by adjusting the PWM ratio of yellow light in the display control module, the color coordinates of the yellow light formed by the light beam emitted by the laser are consistent with or close to the standard yellow color coordinates, and the primary color ratio parameters of the yellow light corresponding to the standard yellow color coordinates are determined.

[0220] Assuming yellow light is emitted, the light emission duration and PWM ratio of the primary color and mixed color are as shown in the following table:

[0221] As shown in the table above, red accounts for A in the overall image's duration, with a red PWM size of a. Green accounts for B in the overall image's duration, with a green PWM size of b. Yellow (red and green light simultaneously) accounts for C in the overall image's duration. When yellow is illuminated, the red and green PWM contributions account for c1 and c2, respectively. Adjusting the ratio of A, B, and C adjusts the duration of the primary and mixed colors in the yellow image.

[0222] By adjusting c1 and c2, the PWM ratio of yellow light can be adjusted. In this way, when yellow appears in the picture, the light can be emitted in red, green and yellow time-sharing modes. The corresponding PWM signals are matched according to a, b, (c1*a+c2*b) to realize pulse modulation of yellow light.

[0223] Images of different facial scenes can be displayed through simulated projection, and the projected images can be shown to multiple testers. Based on the evaluation of the multiple testers on the display effect of the color of the face in the picture, the PWM signal can be further adjusted to make the final PWM signal more in line with the actual situation, which can further improve the display effect of the laser projection equipment.

[0224] In this way, the color ratio of yellow is achieved by adjusting the time-sharing light output ratio of red, green and yellow in the yellow area displayed on the screen, and the brightness and hue of yellow are adjusted by adjusting the brightness of red and green light output, so as to achieve facial color adjustment of characters in different application scenarios and solve the problem of facial color cast.

[0225] In the color gamut diagram shown in Figure 20, the color coordinates at point E are the purple color coordinates. According to Figure 20, when the saturation of purple is low, point E in the dotted box will deviate from purple and approach the white field (the point on the red and green connecting line), which will make the purple in the projected image appear dim and not rich enough in visual effect, resulting in poor display effect.

[0226] In an embodiment of the present application, the controller may pre-store a correspondence between the proportion of the purple area and the parameter identifier.

[0227] Exemplarily, the parameter identifier may be an identifier for indicating the proportion of the purple area, which may be a number, a symbol, or other types, and this embodiment of the present application does not limit this.

[0228] Exemplarily, for the first image to be displayed, the controller can determine the target proportion of the purple area in the first image, and based on the target proportion, determine the target parameter identifier corresponding to the target proportion in the corresponding relationship, and send the target parameter identifier to the display control module.

[0229] For example, when the controller sends the target parameter identifier to the display control module, it can send the target parameter identifier directly to the display control module, or it can carry the target parameter identifier in the video decoding signal of the first image and send it to the display control module, or send it to the display control module in other ways. The embodiments of the present application are not limited to this.

[0230] Furthermore, the display control module can determine the target parameter corresponding to the target parameter identifier from multiple pre-stored parameters based on the target parameter identifier, and send a first driving signal to the light source assembly based on the target parameter, the first image, the pre-stored primary color light ratio parameters of yellow light and the brightness adjustment parameters, where the target parameters include the saturation parameter and hue parameter of the purple area.

[0231] Based on the above-described embodiment, the display control module can determine the driving signal for the facial color area in the first image based on the facial image and pre-stored primary color ratio parameters of yellow light. For the purple area in the first image, the driving signal for the purple area can be determined based on the image of the purple area and the saturation parameter and hue parameter in the target parameters. The driving signals for other areas can be directly determined based on the image content and the primary color ratio parameters of white balance. In this way, when the light source assembly is controlled by the first driving signal and the light beam emitted by the light source assembly is projected into an image, the facial color and the purple area in the projected image are adjusted, making the purple color in the projected image more intense and improving the projection display effect.

[0232] In an embodiment of the present application, the controller may determine a target proportion of the purple area in the first image by: the controller determines, based on multiple color coordinates of the first image, a target color coordinate in a target coordinate region among the multiple color coordinates, and determines the target proportion of the purple area in the first image based on the target color coordinates. The target coordinate region includes the purple color coordinate, and the distance between the purple color coordinate and the center coordinate of the target coordinate region is less than a preset value. The purple color coordinate is determined based on the white balance color coordinate.

[0233] Exemplarily, the preset value may be a smaller value so that the purple color coordinate is at the center of the target coordinate area or close to the center of the target coordinate area. The embodiment of the present application does not limit the preset value.

[0234] In this way, the purple color coordinates determined based on the white balance color coordinates can be used as standard purple color coordinates, so that the purple area proportion determined according to the purple color coordinates is more accurate, further improving the display effect of the projection picture.

[0235] For example, the target coordinate area can be obtained by pre-partitioning the color gamut. For example, the area within the solid triangle in FIG20 can be divided to obtain the target area including the purple color coordinate.

[0236] FIG21 is a schematic diagram of a color gamut range for dividing regions provided in an embodiment of the present application.

[0237] As shown in FIG21 , after determining the white field coordinates, i.e., the white balance color coordinates, the line connecting the white field and the primary colors can be extended to obtain the color coordinates of the mixed color at the standard color temperature. This results in six partitions. For example, the blue point, the white field point, and the magenta point (a mixed color of blue and red) can define a triangular area, and the purple color coordinate point E is within this area. Therefore, the dotted triangle area in FIG21 can be the target area.

[0238] It should be noted that the embodiment of the present application only uses the example of dividing the color gamut range of the light source assembly into 6 areas as shown in Figure 21 for illustration. Of course, it can also be divided into more areas, and the embodiment of the present application does not limit this.

[0239] In the embodiment of the present application, the laser projection device also supports the user to adjust the purple color according to their needs. The following describes the process of adjusting the projection image according to the user's operation.

[0240] It should be understood that the user can adjust the color according to needs after adjusting the display mode or before adjusting the display mode, and the embodiments of the present application do not limit this.

[0241] The following three possible implementations can be used to adjust the color purple based on user needs:

[0242] In one possible implementation, when a user inputs an operation on the projection interface to adjust the purple hue in the display image to a target hue, the SOC can obtain the target purple hue carried in a first instruction and send the target hue to the display control module. The first instruction is generated when the user inputs an operation to adjust the purple hue in the display image to the target hue.

[0243] Furthermore, the display control module can send a second drive signal to the light source assembly based on the target hue and a second image to be displayed, where the second image includes a purple color. Based on the second drive signal, the light source assembly can emit a light beam to the light modulation assembly for projection display. The light modulation assembly can modulate the light beam to produce a second target light beam. The lens can use the second target light beam to project the second image onto the display screen.

[0244] In this way, the laser projection device can adjust the purple hue of the image to be displayed according to the user's demand for purple, so that the user can adjust the hue of the projected image according to his or her needs, thereby improving the flexibility of adjusting the projected image.

[0245] In another possible implementation, when a user inputs an operation on the projection interface to adjust the saturation of purple in the display image to a target saturation, the SOC may obtain the target saturation of purple carried in the second instruction and send the target saturation to the display control module. The second instruction is generated when the user inputs an operation to adjust the saturation of purple in the display image to the target saturation.

[0246] Furthermore, the display control module is also used to send a third driving signal to the light source assembly based on the target saturation and the third image to be displayed, and the color of the third image includes purple; the light source assembly is used to emit a light beam to the light modulation assembly based on the third driving signal, and the light beam is used for projection display; the light modulation assembly is used to modulate the light beam to obtain a third target light beam; the lens is used to use the third target light beam to project and display the third image on the display screen.

[0247] In this way, the laser projection device can adjust the saturation of purple in the displayed image according to the user's demand for purple, allowing the user to adjust the saturation of the projected image according to their needs, thereby improving the flexibility of projected image adjustment.

[0248] In another possible implementation, when a user inputs an operation on the projection interface to adjust the gain of the purple color in the display image to a target gain, the SOC may obtain the target gain for the purple color carried in the third instruction and send the target gain to the display control module. The third instruction is generated when the user inputs an operation to adjust the gain of the purple color in the display image to the target gain.

[0249] Furthermore, the display control module is also used to send a fourth driving signal to the light source assembly based on the target gain and the fourth image to be displayed, and the color of the third image includes purple; the light source assembly is used to emit a light beam to the light modulation assembly based on the fourth driving signal, and the light beam is used for projection display; the light modulation assembly is used to modulate the light beam to obtain a fourth target light beam; and the lens is used to use the fourth target light beam to project and display the fourth image.

[0250] In this way, the laser projection device can adjust the gain of purple in the image to be displayed according to the user's demand for purple, so that the user can adjust the gain of the projected image according to his or her needs, thereby improving the flexibility of adjusting the projected image.

[0251] Based on the above embodiments, when the function of adjusting the hue, saturation and gain of the picture is opened to the user, it is necessary to set an interface between the controller and the display control module, so that the controller and the display control module are connected through the interface, so that the user can adjust the parameters in real time on the projection interface, making the purple area in the picture display more vivid, thereby improving the picture display effect.

[0252] For example, the projection interface provided by the laser projection device to the user for parameter adjustment can be shown in FIG22 , which is a schematic diagram of the projection interface of a laser projection device provided in an embodiment of the present application.

[0253] As shown in Figure 22, the projection interface includes a hue adjustment box, a saturation adjustment box, and a gain adjustment box. Users can adjust the corresponding parameters in each parameter adjustment box. The position of the dot in each adjustment box is the target position of the parameter to be adjusted.

[0254] In combination with the above embodiments, the structure of the laser projection device is further described. FIG23 is a schematic diagram of the circuit control principle of another laser projection device provided by an embodiment of the present application.

[0255] As shown in FIG23 , the controller in the mainboard of the laser projection device can communicate with the display control module. Specifically, the controller can communicate with the DLP in the display control module to transmit the decoding information of the image to be displayed to the DLP.

[0256] Exemplarily, the decoding information includes content information of the image to be displayed, parameter identifiers corresponding to the proportion of the purple area in the image, application scenarios to which the image to be displayed belongs, etc., which are not limited in the embodiments of the present application.

[0257] The DLP can generate a first drive signal and a modulated drive signal based on the information received from the controller, and send the first drive signal to the laser driver chip in the light source assembly. The laser driver chip can then control the laser to emit a light beam based on the first drive signal. The DLP can send the modulated drive signal to the light modulation assembly, which can modulate the light beam emitted by the laser based on the modulated drive signal and direct the modulated light beam to the lens. The lens can then use the light beam to project an image on the projection screen.

[0258] FIG24 is a fourth flow chart of a projection display method provided in an embodiment of the present application. The projection display method can be implemented using the laser projection device described in the above embodiment. As shown in FIG17 , the projection display method may include:

[0259] S2401: Generate a first driving signal according to a first image to be displayed, pre-stored primary color ratio parameters of yellow light, and brightness adjustment parameters.

[0260] The display control module generates a first driving signal according to the first image to be displayed, the pre-stored primary color ratio parameters of yellow light, and the brightness adjustment parameters, and sends the first driving signal to the light source assembly.

[0261] The first image includes a face image, and the primary color ratio parameter of the yellow light is determined according to the yellow color coordinates, and the yellow color coordinates are determined according to the wavelength of the light beam that can be emitted by the light source component.

[0262] S2402: Control the emission of the light beam according to the first driving signal.

[0263] The light source component is controlled to emit a light beam to the light modulation component according to the first driving signal, and the light beam is used for projection display.

[0264] S2403. Modulate the emitted light beam to obtain a first target light beam.

[0265] The light beam is modulated by the light modulation component to obtain a first target light beam.

[0266] S2404: Project a first target light beam to form a first image.

[0267] A first image is projected and displayed on a display screen through a lens using a first target light beam.

[0268] The embodiment of the present application provides a projection display method, the implementation principle and technical effects of which are similar to those of the laser projection device described in the above embodiment, and will not be repeated here.

[0269] The present application also provides a computer-readable storage medium, which may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes. Specifically, the computer-readable storage medium stores program instructions, and the program instructions are used for the methods in the above embodiments.

[0270] The present application also provides a program product including execution instructions stored in a readable storage medium. At least one control module of a laser projection device can read the execution instructions from the readable storage medium, and at least one control module executes the execution instructions to cause the laser projection device to implement the brightness adjustment methods provided in the various embodiments described above.

[0271] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0272] For ease of explanation, the above description has been made with reference to specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations are possible. The above embodiments are selected and described to better explain the principles and practical applications, so that those skilled in the art can better utilize the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A laser projection device, characterized in that: The laser projection device includes: a display screen and a controller connected to the display screen; the display screen is used to display images, the laser projection device has multiple display modes, and the controller is configured to: When the laser projection device is in a first display mode, in response to an adjustment instruction for the first display mode, and / or in response to triggering the second display mode, determining a third display mode from candidate display modes according to a priority of the display modes; Brightness adjustment is performed according to the brightness adjustment parameters of the third display mode to project and display the image to be displayed on the display screen.

2. The laser projection device according to claim 1, characterized in that: The controller is configured to: In response to a closing instruction for the first display mode, selecting a display mode with a lower priority than the first display mode as the candidate display mode; When there are at least two candidate display modes, displaying the candidate display modes; In response to a user's instruction, the third display mode is determined from the candidate display modes, and the third display mode is entered.

3. The laser projection device according to claim 1, characterized in that: The controller is configured to: In the first display mode, in response to an instruction to start the fourth display mode; If the priority of the fourth display mode is higher than that of the first display mode, using the fourth display mode as the third display mode and entering the fourth display mode; If the priority of the fourth display mode is lower than that of the first display mode, determining whether the current brightness is greater than a preset brightness; If the current brightness is less than the preset brightness, entering the fourth display mode, and adjusting the brightness based on the brightness adjustment parameter of the fourth display mode to project the image to be displayed on the display screen; If the current brightness is greater than or equal to the preset brightness, the fourth display mode is entered, and brightness adjustment is performed based on the brightness adjustment parameters of the first display mode to project the image to be displayed on the display screen.

4. The laser projection device according to claim 1, characterized in that: The controller is configured to: When it is detected that the trigger condition of the second display mode is met, if the priority of the second display mode is higher than that of the first display mode, using the second display mode as the third display mode; If the priority of the second display mode is lower than that of the first display mode, the first display mode is used as the third display mode.

5. The laser projection device according to claim 4, characterized in that: If the second display mode is the eye protection mode, the controller is configured to: When the user is detected in the first area, the eye protection mode is triggered; Displaying a first picture on the display screen, where the first picture is used to prompt the user to leave the first area; Turning off the laser projection device laser after a preset time; When it is detected that the user leaves the first area, the human eye protection mode is exited, and brightness adjustment is performed based on the first display mode to project the image to be displayed on the display screen.

6. The laser projection device according to claim 4, characterized in that: The second display mode is a high temperature thermal protection mode, and the controller is configured to: monitoring the temperature of the laser projection device; If the temperature is greater than a first preset temperature, a high temperature thermal protection mode is triggered; reducing the brightness of the laser projection device; After a preset time, if the temperature is greater than a second preset temperature, the brightness of the laser projection device is reduced again.

7. The laser projection device according to claim 6, characterized in that: The controller is configured to: When the laser projection device is in multiple display modes and is turned on simultaneously, it does not respond to the user's adjustment of brightness; or, When the laser projection device is in the high-temperature thermal protection mode, if the number of brightness adjustments is greater than a preset number, the device does not respond to the user's adjustment of brightness.

8. The laser projection device according to claim 1, characterized in that: The controller is configured to: During the startup process, determining a first display mode of the laser projection device according to the display mode memorized by the laser projection device; The brightness of the laser projection device is set according to the brightness adjustment parameter corresponding to the first display mode.

9. The laser projection device according to any one of claims 1 to 8, characterized in that: The display mode includes one or more of a quiet mode, a photo mode, a standard mode, a high temperature thermal protection mode, and a human eye protection mode; The priorities of the human eye protection mode, the high temperature protection mode, the photo mode, the quiet mode, and the standard mode are reduced in sequence; The quiet mode is used to instruct the heat dissipation device of the laser projection device to enter the noise reduction mode; the photo mode is used to instruct the laser of the laser projection device to gain red brightness; the high-temperature thermal protection mode is used to instruct the laser of the laser projection device to cool down; the human eye protection mode is used to instruct the laser projection device to perform human eye protection operation.

10. The laser projection device according to claim 1, characterized in that: The laser projection device also includes a display control module, a light source component, a light modulation component and a lens; The controller is configured to: send the brightness adjustment parameter to the display control module; The display control module is configured to send a first driving signal to the light source assembly based on a first image to be displayed, pre-stored primary color ratio parameters of yellow light, and the brightness adjustment parameter, wherein the first image includes a face image, the primary color ratio parameters of yellow light are determined based on yellow color coordinates, and the yellow color coordinates are determined based on a wavelength of a light beam that can be emitted by the light source assembly; The light source assembly is configured to: emit a light beam to the light modulation assembly according to the first driving signal, wherein the light beam is used for projection display; The light modulation component is configured to: modulate the light beam to obtain a first target light beam; The lens is configured to project and display the first image on the display screen using the first target light beam.

11. The laser projection device according to claim 10, characterized in that: The display control module pre-stores white balance primary color light ratio parameters, the white balance primary color light ratio parameters are determined according to white balance color coordinates, and the white balance color coordinates are determined according to the wavelength of the light beam that can be emitted by the light source assembly; The yellow color coordinates are determined based on the white balance color coordinates and according to the wavelength of the green primary color light and the wavelength of the yellow primary color wave that can be emitted by the light source assembly.

12. The laser projection device according to claim 11, characterized in that: The controller pre-stores the correspondence between the purple area ratio and the parameter identifier; The controller is further configured to: determine a target proportion of the purple area in the first image, and according to the target proportion, determine a target parameter identifier corresponding to the target proportion in the corresponding relationship, and send the target parameter identifier to the display control module; The display control module is configured to: determine, based on the target parameter identifier, a target parameter corresponding to the target parameter identifier from a plurality of pre-stored parameters, and send a first driving signal to the light source assembly based on the target parameter, the first image, a pre-stored primary color ratio parameter of yellow light, and the brightness adjustment parameter, wherein the target parameter includes a saturation parameter and a hue parameter of a purple area.

13. The laser projection device according to claim 12, characterized in that: The controller is further configured to: Based on multiple color coordinates of the first image, target color coordinates in the target coordinate area are determined among the multiple color coordinates, and the target proportion of the purple area in the first image in the first image is determined based on the target color coordinates; the target coordinate area includes purple color coordinates, and the distance between the purple color coordinates and the center coordinates of the target coordinate area is less than a preset value, and the purple color coordinates are determined based on the white balance color coordinates.

14. The laser projection device according to claim 13, characterized in that: The controller is configured to: obtain a target purple hue carried in a first instruction and send the target hue to the display control module; the first instruction is generated when a user inputs an operation for adjusting the purple hue in the display image to the target hue; The display control module is further configured to: send a second driving signal to the light source assembly according to the target color tone and a second image to be displayed, wherein the color of the second image includes purple; The light source assembly is further configured to: emit a light beam to the light modulation assembly according to the second driving signal, wherein the light beam is used for projection display; The light modulation component is further configured to: modulate the light beam to obtain a second target light beam; The lens is further configured to project and display the second image on the display screen using the second target light beam.

15. The laser projection device according to claim 13, characterized in that: The controller is configured to: obtain a target saturation of purple carried in a second instruction and send the target saturation to the display control module; the second instruction is generated when a user inputs an operation for adjusting the saturation of purple in the display image to the target saturation; The display control module is further configured to: send a third driving signal to the light source assembly according to the target saturation and a third image to be displayed, wherein the color of the third image includes purple; The light source assembly is further configured to: emit a light beam to the light modulation assembly according to the third driving signal, wherein the light beam is used for projection display; The light modulation component is further configured to: modulate the light beam to obtain a third target light beam; The lens is further configured to project and display the third image on the display screen using the third target light beam.

16. The laser projection device according to any one of claims 10 to 15, characterized in that: The controller and the display control module are connected via an interface.

17. A projection display method, characterized in that: Applicable to laser projection equipment, the laser projection equipment includes: a display screen and a controller connected to the display screen; the display screen is used for displaying images, and the laser projection equipment has multiple display modes; The method comprises: When the laser projection device is in a first display mode, the controller responds to an adjustment instruction for the first display mode and / or responds to triggering the second display mode, and determines a third display mode from candidate display modes according to a priority of the display modes; The controller performs brightness adjustment according to the brightness adjustment parameter of the third display mode, so as to project and display the image to be displayed on the display screen.

Images