CN117377907A

CN117377907A - Laser projection apparatus and control method thereof

Info

Publication number: CN117377907A
Application number: CN202280037927.5A
Authority: CN
Inventors: 崔雷; 邢哲
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2021-05-31
Filing date: 2022-05-31
Publication date: 2024-01-09
Also published as: WO2022253246A1; CN113253559A

Abstract

A laser projection device (10) includes a light source assembly (100), a first temperature sensor (400), and a controller (500). The light source assembly (100) includes at least two color laser arrays (110, 120, 130) and is configured to provide an illumination beam. The first temperature sensor (400) is configured to detect an ambient temperature at which the laser projection device (10) is located. The controller (500) is configured to: if the ambient temperature is above a first threshold temperature, the operating current of the at least one color laser array (110, 120, 130) is turned down based on the positive correlation of the ambient temperature and the amount of turning down the operating current of the at least one color laser array (110, 120, 130), and if the ambient temperature is below a second threshold temperature, the operating current of the at least one color laser array (110, 120, 130) is turned up based on the negative correlation of the ambient temperature and the amount of turning up the operating current of the at least one color laser array (110, 120, 130), the second threshold temperature being less than the first threshold temperature.

Description

Laser projection apparatus and control method thereof

The present application claims priority from the chinese patent application No. 202110602333.1 filed 5.31 in 2021, the entire contents of which are incorporated herein by reference.

Technical Field

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

Background

The laser projection system comprises a projection screen and a laser projection device, and the laser projection device can project pictures on the projection screen so as to realize functions of video playing and the like.

Current laser projection devices include: the light source assembly is used for providing high-intensity laser illumination light beams for the optical machine; the optical machine is used for modulating the image signal of the laser illumination beam to form a projection beam, and the projection beam formed after the modulation of the optical machine enters the lens; the lens is used for projecting the projection beam onto a projection screen.

Disclosure of Invention

Some embodiments of the present disclosure provide a laser projection device comprising: a light source assembly, a first temperature sensor and a controller; the light source assembly includes an array of lasers of at least two colors and is configured to provide an illumination beam; a first temperature sensor configured to detect an ambient temperature at which the laser projection device is located; a controller coupled to the light source assembly and the first temperature sensor and configured to: if the ambient temperature is higher than the first threshold temperature, regulating the working current of the laser array of at least one color based on the positive correlation between the ambient temperature and the regulating quantity of the working current of the laser array of at least one color; if the ambient temperature is lower than the second threshold temperature, the working current of the laser array of at least one color is regulated on the basis of the negative correlation between the ambient temperature and the regulating quantity of the working current of the laser array of at least one color; the second threshold temperature is less than the first threshold temperature.

Some embodiments of the present disclosure provide a control method of a laser projection apparatus, including: acquiring the ambient temperature of the laser projection equipment; if the ambient temperature is higher than the first threshold temperature, regulating the working current of the laser array of at least one color based on the positive correlation between the ambient temperature and the regulating quantity of the working current of the laser array of at least one color; if the ambient temperature is lower than the second threshold temperature, the working current of the laser array of at least one color is regulated on the basis of the negative correlation between the ambient temperature and the regulating quantity of the working current of the laser array of at least one color; the second threshold temperature is less than the first threshold temperature.

Some embodiments of the present disclosure provide a laser projection device comprising: a light source assembly comprising an array of lasers of at least two colors and configured to provide an illumination beam; a first temperature sensor configured to detect an ambient temperature at which the laser projection device is located; the controller is configured to: if the ambient temperature is higher than a first threshold temperature, reducing the working current of the laser array of at least one color by a first value; if the ambient temperature is lower than a second threshold temperature, the working current of the laser array with at least one color is increased by a second value; the second threshold temperature is less than the first threshold temperature.

Some embodiments of the present disclosure provide a laser projection device comprising: the shell is provided with a first air inlet; a light source assembly comprising an array of lasers of at least two colors and configured to provide an illumination beam; a first temperature sensor located at the first air inlet of the housing and configured to detect an ambient temperature at which the laser projection device is located; a controller is coupled to the light source assembly and the first temperature sensor and configured to adjust an operating current of the at least one color laser array based on the ambient temperature.

Drawings

In order to more clearly illustrate the technical solutions of the present disclosure, the drawings that need to be used in some embodiments of the present disclosure will be briefly described below, and it is apparent that the drawings in the following description are only drawings of some embodiments of the present disclosure, and other drawings may be obtained according to these drawings to those of ordinary skill in the art. Furthermore, the drawings in the following description may be regarded as schematic diagrams, not limiting the actual size of the products, the actual flow of the methods, the actual timing of the signals, etc. according to the embodiments of the present disclosure.

FIG. 1 is a block diagram of a laser projection device according to some embodiments of the present disclosure;

FIG. 2 is a schematic diagram of a light source assembly, an optical engine, and a lens in a laser projection device according to some embodiments of the present disclosure;

FIG. 3 is a diagram of an optical path architecture in a laser projection device according to some embodiments of the present disclosure;

FIG. 4 is a schematic view of the optical path principle of a light source assembly in a laser projection device according to some embodiments of the present disclosure;

FIG. 5 is a block diagram of an arrangement of micro mirror plates in a digital micromirror device according to some embodiments of the present disclosure;

FIG. 6 is a schematic diagram of the operation of a micro-mirror plate according to some embodiments of the present disclosure;

FIG. 7 is a schematic diagram showing the position of a micro mirror plate wobble in the digital micromirror device of FIG. 5;

FIG. 8 is a block diagram of a laser projection device according to some embodiments of the present disclosure;

FIG. 9 is a block diagram of a laser projection device according to some embodiments of the present disclosure;

FIG. 10 is a block diagram of another laser projection device according to some embodiments of the present disclosure;

FIG. 11 is a block diagram of a first heat sink according to some embodiments of the present disclosure;

FIG. 12 is a block diagram of a second heat sink according to some embodiments of the present disclosure;

FIG. 13 is a block diagram of a laser projection system according to some embodiments of the present disclosure;

Fig. 14 is a flow chart of a method of controlling a laser projection device according to some embodiments of the present disclosure.

Detailed Description

The following description of the embodiments of the present disclosure will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by one of ordinary skill in the art based on the embodiments provided by the present disclosure are within the scope of the present disclosure.

Throughout the specification and claims, unless the context requires otherwise, the word "comprise" and its other forms such as the third person referring to the singular form "comprise" and the present word "comprising" are to be construed as open, inclusive meaning, i.e. as "comprising, but not limited to. In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", "some examples", "and the like are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.

In describing some embodiments, expressions of "coupled" and "connected" and their derivatives may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other. As another example, the term "coupled" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact. However, the term "coupled" or "communicatively coupled (communicatively coupled)" may also mean that two or more elements are not in direct contact with each other, but yet still co-operate or interact with each other. The embodiments disclosed herein are not necessarily limited to the disclosure herein.

At least one of "A, B and C" has the same meaning as at least one of "A, B or C," both include the following combinations of A, B and C: a alone, B alone, C alone, a combination of a and B, a combination of a and C, a combination of B and C, and a combination of A, B and C.

"A and/or B" includes the following three combinations: only a, only B, and combinations of a and B.

As used herein, the term "if" is optionally interpreted to mean "when … …" or "at … …" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if determined … …" or "if detected [ stated condition or event ]" is optionally interpreted to mean "upon determining … …" or "in response to determining … …" or "upon detecting [ stated condition or event ]" or "in response to detecting [ stated condition or event ]" depending on the context.

The use of "adapted" or "configured to" herein is meant to be an open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

In addition, the use of "based on" is intended to be open and inclusive in that a process, step, calculation, or other action "based on" one or more of the stated conditions or values may be based on additional conditions or beyond the stated values in practice.

Some embodiments of the present disclosure provide a laser projection device, as shown in fig. 1, the laser projection device 10 includes a complete machine housing 101 (only a part of the housing is shown in the figure), a light source assembly 100, a light engine 200, and a lens 300, which are assembled in the complete machine housing 101. The light source assembly 100 is configured to provide an illumination beam (laser beam). The light engine 200 is configured to modulate an illumination beam provided by the light source assembly 100 with an image signal to obtain a projection beam. The lens 300 is configured to project a projection beam onto a screen or wall for imaging. The light source assembly 100, the optical machine 200 and the lens 300 are sequentially connected along the light beam propagation direction, and are respectively wrapped by corresponding housings. The respective housings of the light source assembly 100, the light engine 200, and the lens 300 support the optical components and enable the optical components to meet certain sealing or airtight requirements. For example, the light source assembly 100 can realize airtight sealing through the corresponding housing, so that the light attenuation problem of the light source assembly 100 can be better improved.

One end of the optical engine 200 is connected to the lens 300 and disposed along a first direction X of the whole machine, for example, the first direction X may be a width direction of the whole machine. The light source module 100 is connected to the other end of the optical machine 200. In this example, the light source assembly 100, the optical engine 200 and the lens 300 are connected to form an L shape, and this connection structure can adapt to the light path characteristics of the reflective light valve in the optical engine 200 on one hand, and is beneficial to shortening the length of the light path in one dimension direction and to the structural arrangement of the whole machine on the other hand. For example, when the light source assembly 100, the optical bench 200, and the lens 300 are disposed in one dimension direction (e.g., a direction perpendicular to the first direction X), the length of the optical path in the direction is long, thereby being disadvantageous for the structural arrangement of the entire machine.

In some embodiments, referring to fig. 2, the light source assembly 100 may include three laser arrays. The three laser arrays may be respectively a red laser array 130, a green laser array 120 and a blue laser array 110, i.e. the light source assembly 100 is a three-color laser light source; however, the present invention is not limited thereto, and the three laser arrays may be all blue laser arrays 110, or two laser arrays may be blue laser arrays 110 and one laser array may be red laser array 130.

In some embodiments, the light source assembly 100 may also include two laser arrays. The two laser arrays may be a blue laser array 110 and a red laser array 130, i.e., the light source assembly 100 is a bi-color laser light source; or may be blue laser arrays 110, i.e., the light source assembly 100 is a monochromatic laser light source. In other embodiments, the light source assembly 100 may also include one laser array, i.e., the light source assembly 100 is a monochromatic laser light source in which the one laser array may be a blue laser array 110, see fig. 4.

When the light source assembly 100 includes only the blue laser array 110, or only the blue laser array 110 and the red laser array 130, as shown in fig. 4, the light source assembly 100 may further include: a fluorescent wheel 140 and a color filter wheel 150. After the blue laser 110 emits blue light, a portion of the blue light impinges on the fluorescent wheel 140 to generate red fluorescence (and green fluorescence is no longer required when the light source assembly 100 includes the red laser array 130); then, the blue laser light, the red fluorescence (or red laser light), and the green fluorescence sequentially pass through the light combining lens 160, and then pass through the color filter wheel 150 to be filtered, and the tri-primary color light is sequentially output. According to the persistence of vision phenomenon of human eyes, the human eyes cannot distinguish the color of light at a certain moment, and the perceived white light is still mixed.

The illumination beam from the light source assembly 100 enters the light engine 200. Referring to fig. 2 and 3, the optical bench 200 may include: light pipe 210, lens assembly 220, mirror 230, digital micromirror device (Digital Micromirror Device, DMD) 240, and prism assembly 250. The light pipe 210 may receive and homogenize an illumination beam provided by the light source assembly 100. The lens assembly 220 may amplify the illumination beam before converging and exiting to the mirror 230. The mirror 230 may reflect the illumination beam to the prism assembly 250. The prism assembly 250 reflects the illumination beam to the DMD 240, and the DMD 240 modulates the illumination beam and reflects the modulated projection beam to the lens 300.

In the optical engine 200, the DMD 240 is a core component, which is used to modulate an illumination beam provided by the light source assembly 100 by using an image signal, namely: the illumination beam is controlled to display different colors and brightness for different pixels of the image to be displayed to ultimately form an optical image, and thus, the DMD 240 is also referred to as a light modulation device or light valve. The light modulation device (or light valve) may be classified as either a transmissive light modulation device (or light valve) or a reflective light modulation device (or light valve) depending on whether the light modulation device (or light valve) transmits or reflects the illumination beam. For example, the digital micromirror device 240 shown in fig. 2 and 3 reflects an illumination beam, i.e., is a reflective light modulation device. The liquid crystal light valve transmits the illumination beam, and thus, the liquid crystal light valve is a transmissive light modulation device. Furthermore, the light engine may be classified as a single-chip system, a two-chip system, or a three-chip system depending on the number of light modulation devices (or light valves) used in the light engine. For example, only one piece of digital micromirror device 240 is used in the light engine 200 shown in fig. 2 and 3, and thus the light engine 200 may be referred to as a monolithic system. When a three-piece digital micromirror device is used, then the optical bench 200 may be referred to as a three-piece system.

Digital micromirror device 240 is used in digital light processing (Digital Light Processing, DLP) projection architecture the light engine 200 shown in fig. 2 and 3 uses a DLP projection architecture. As shown in fig. 5, the digital micromirror device 240 includes thousands of micro mirror plates 2401 that can be individually driven to rotate, and the micro mirror plates 2401 are arranged in an array, and each micro mirror plate 2401 corresponds to one pixel in an image to be displayed. In the DLP projection architecture, each micro mirror 2401 corresponds to a digital switch, and can swing within a range of plus or minus 12 degrees or plus or minus 17 degrees under the action of an external electric field, as shown in fig. 7.

As shown in fig. 6, the light reflected by the micro mirror 2401 at a negative deflection angle is called OFF light, which is ineffective light, and is normally incident on the whole housing 101, the housing of the optical engine 200, or the light absorbing unit. The light reflected by the micro mirror 2401 at the positive deflection angle is called ON light, which is an effective light beam irradiated by the illumination light beam received by the micro mirror 2401 ON the surface of the DMD 240 and incident ON the lens 300 through the positive deflection angle for projection imaging. The on state of the micro mirror 2401 is a state in which the micro mirror 2401 is in and can be held when the illumination beam emitted from the light source module 100 is reflected by the micro mirror 2401 and can enter the lens 300, that is, a state in which the micro mirror 2401 is in a positive deflection angle. The off state of the micro mirror 2401 is a state in which the micro mirror 2401 is in a state in which the micro mirror 2401 can be held, that is, a state in which the micro mirror 2401 is in a negative deflection angle, when the illumination light beam emitted from the light source module 100 is reflected by the micro mirror 2401 and does not enter the lens 300.

For example, for a micro mirror 2401 having a yaw angle of ±12°, the state at +12° is the on state, the state at-12 ° is the off state, and for a yaw angle between-12 ° and +12°, the actual operating state of the micro mirror 2401 is only the on state and the off state. In the case of the minute mirror 2401 having a deflection angle of ±17°, the state at +17° is the on state, and the state at-17 ° is the off state. The image signal is converted into digital codes of 0 and 1 after processing, and these digital codes can drive the micro mirror 2401 to oscillate.

In the display period of one frame image, part or all of the micro mirror plates 2401 are switched between the on state and the off state once, so that the gray scale of each pixel in one frame image is realized according to the time that the micro mirror plates 2401 are respectively in the on state and the off state. For example, when the pixel has 256 gradations of 0 to 255, the minute reflection mirror corresponding to the gradation 0 is in the off state for the entire display period of one frame image, the minute reflection mirror corresponding to the gradation 255 is in the on state for the entire display period of one frame image, and the minute reflection mirror corresponding to the gradation 127 is in the on state for half of the time and the other half of the time in the display period of one frame image. Therefore, the state of each micro mirror plate in the DMD 240 in the display period of one frame image and the maintenance time of each state are controlled by the image signal, so that the brightness (gray scale) of the corresponding pixel of the micro mirror plate 2401 can be controlled, and the purpose of modulating the illumination beam projected to the DMD 240 is achieved.

The light pipe 210, the lens assembly 220 and the reflector 230 at the front end of the DMD 240 form an illumination light path, and the illumination light beam emitted from the light source assembly 100 passes through the illumination light path to form a beam size and an incident angle which meet the requirements of the DMD 240.

As shown in fig. 2, the lens 300 includes a plurality of lens combinations, which are generally divided into three sections of a front group, a middle group, and a rear group, or two sections of a front group and a rear group according to groups. The front group is the lens group near the light exit side (left side in fig. 2) of the projection device, and the rear group is the lens group near the light exit side (right side in fig. 2) of the light engine 200. Lens 300 may also be a zoom lens, a fixed focus adjustable focus lens, or a fixed focus lens, depending on the various lens group combinations described above. In some embodiments, the laser projection device is an ultra-short focal projection device, the lens 300 is an ultra-short focal projection lens, and the throw ratio of the lens 300 is typically less than 0.3, such as 0.24.

During operation of the laser projection device 10, the light source assembly 100 generates a significant amount of heat. When the environmental temperature of the environment in which the laser projection apparatus 10 is located is too high, the heat dissipation capability of the heat dissipation assembly in the laser projection apparatus 10 is reduced, and in this case, in order to transfer the heat generated by the light source assembly 100 to the external environment through the heat dissipation assembly, the rotation speed of the fan in the heat dissipation assembly needs to be increased to increase the heat dissipation capability of the heat dissipation assembly. Therefore, the heat dissipation assembly may be caused to emit larger noise, which in turn may result in larger operational noise of the laser projection device 10. Moreover, if the ambient temperature of the laser projection device increases, the effect of transferring the heat generated by the light source assembly 100 to the external environment can not be achieved by merely increasing the rotation speed of the fan in the heat dissipation assembly, thereby affecting the light efficiency, reliability and lifetime of the light source assembly 100.

To this end, some embodiments of the present disclosure provide a laser projection device, in which an ambient temperature in which the laser projection device 10 is located is detected by the first temperature sensor 400, and the controller 500 adjusts an operating current of the laser array of at least one color in the light source assembly 100 according to the ambient temperature. Therefore, the operating current of the laser array of at least one color in the light source assembly 100 can be reduced when the ambient temperature in which the laser projection device 10 is located is high, so that the heat generated by the laser array is reduced. Therefore, the operating temperature of the light source assembly 100 can be reduced without increasing the rotational speed of the cooling fan in the laser projection device 10, thereby reducing the operating noise of the laser projection device 10, and improving the light efficiency, reliability, and lifetime of the laser array in the light source assembly 100.

Some embodiments of the present disclosure provide a laser projection device 10, as shown in fig. 8, the laser projection device 10 comprising: the light source assembly 100, the first temperature sensor 400, and the controller 500. The light source assembly 100 and the first temperature sensor 400 are both coupled to the controller 500.

The light source assembly 100 includes an array of lasers of at least two colors and is configured to provide an illumination beam. For example, the light source assembly 100 includes at least two color laser arrays of the red, green and blue laser arrays 130, 120 and 110.

The first temperature sensor 400 is configured to detect an ambient temperature at which the laser projection device is located. The position of the first temperature sensor 400 in the laser projection device 10 is not limited in the embodiments of the present disclosure, as long as the ambient temperature in which the laser projection device is located can be detected.

In some embodiments, as shown in fig. 9, the laser projection device 10 further includes a housing 101, the housing 101 having a first air inlet, and the first temperature sensor 400 is located at the first air inlet of the housing 101. The light source assembly 100 and the controller 500 are both located within the housing 101.

In some embodiments, since the first temperature sensor 400 is located at the first air inlet of the housing 101, the first temperature sensor 400 may detect the temperature of the air flow entering the laser projection device 10, and since the air flow entering the laser projection device 10 is the air flow in the environment in which the laser projection device 10 is located, the first temperature sensor 400 may detect the temperature of the air flow in the environment in which the laser projection device 10 is located. That is, the first temperature sensor 400 may detect the ambient temperature in which the laser projection device 10 is located. Also, the first temperature sensor 400 may also send the ambient temperature it detects to the controller 500 in the laser projection device 10.

In some embodiments, the controller 500 is configured to: and if the ambient temperature is higher than the first threshold temperature, reducing the working current of the laser array of at least one color. If the ambient temperature is lower than the second threshold temperature, the working current of the laser array with at least one color is regulated; the second threshold temperature is less than the first threshold temperature. The value of the first threshold temperature and the value of the second threshold temperature are not limited in the embodiments of the present disclosure, and the following embodiments are exemplified by the first threshold temperature being 35 degrees celsius and the second threshold temperature being 25 degrees celsius.

Higher in embodiments of the present disclosure includes greater than or equal to, lower than or equal to.

In some embodiments, the first threshold temperature is 35 degrees celsius and the second threshold temperature is 25 degrees celsius as an example. If the ambient temperature detected by the first temperature sensor 400 is higher than the first threshold temperature, the controller 500 turns down the operating current of the laser array of at least one color in the light source assembly 100. Therefore, by reducing the operating current of the laser array of at least one color in the light source assembly 100, the amount of heat generated by the laser array can be reduced, reducing the operating temperature of the light source assembly 100. Therefore, when the environmental temperature of the laser projection device 10 is high, the working temperature of the light source assembly 100 can be reduced without increasing the rotation speed of the cooling fan in the laser projection device 10, so that the working noise of the laser projection device 10 is reduced, and the light efficiency, the reliability and the service life of the laser array in the light source assembly 100 are improved.

In some embodiments, the controller 500 adjusts the operating current of the laser array of at least one color in the light source assembly 100 if the ambient temperature detected by the first temperature sensor 400 is below the second threshold temperature. Therefore, by increasing the operating current of the laser array of at least one color in the light source assembly 100, it is possible to ensure that the operating temperature of the laser array of the light source assembly 100 in the laser projection apparatus 10 is stabilized within a certain operating temperature range (for example, the operating temperature range is 25 degrees celsius to 45 degrees celsius), and to ensure the display effect of the laser projection apparatus.

The red light has strong photosensitivity relative to the green light and the blue light, so that the brightness of the red light is changed with the temperature to a greater extent than the brightness of the green light and the yellow light. When the light source assembly comprises a red laser array, if the ambient temperature of the laser projection device is reduced, the luminous efficiency of the red light is increased, i.e. the brightness of the red light is high. If the ambient temperature where the laser projection device is located increases, the luminous efficiency of the red light decreases, i.e. the brightness of the red light is low. Therefore, when the ambient temperature is too high or too low, the light balance of the laser projection device is destroyed, so that the display effect of the picture projected by the laser projection device is poor. In some embodiments of the present disclosure, by adjusting the working current of the laser array, it is ensured that the working temperature of the laser array may be stabilized within a certain working temperature range, so that light balance may be maintained, and the display effect may be better.

According to the laser projection device 10 provided by some embodiments of the present disclosure, the first temperature sensor 400 is disposed in the laser projection device 10 to detect the ambient temperature where the laser projection device 10 is located, if the ambient temperature is higher, the controller 500 adjusts the working current of the laser array of at least one color in the light source assembly 100 in the laser projection device 10, so as to reduce the working temperature of the light source assembly 100, ensure that the working temperature of the light source assembly 100 is stable within a certain working temperature range, and therefore, the working temperature of the light source assembly 100 can be reduced without increasing the rotation speed of the cooling fan in the laser projection device 10, thereby reducing the working noise of the laser projection device 10. In addition, if the ambient temperature is low, the controller 500 increases the working current of the laser array of at least one color in the light source assembly 100 in the laser projection device 10, so as to ensure that the working temperature of the laser array can be stabilized within a certain working temperature range, thereby maintaining the light balance of the laser projection device and improving the display effect of the picture projected by the laser projection device.

In some embodiments of the present disclosure, the operating current of the laser array of at least one color in the light source assembly 100 is turned down if the ambient temperature is higher than the first threshold temperature, thereby ensuring that the operating temperature of the laser array is stabilized within a certain operating temperature range in a plurality of possible implementations, some embodiments of the present disclosure are schematically illustrated by the following two possible implementations.

In a first possible implementation, the controller 500 is configured to: if the ambient temperature detected by the first temperature sensor 400 is higher than the first threshold temperature, the operating current of the laser array of at least one color in the light source assembly 100 is reduced by a first value. The first value may be a fixed value, and the size of the first value is not limited in the embodiments of the present disclosure. Therefore, when the ambient temperature of the laser projection device 10 is high, the operating temperature of the laser array can be ensured to be stable within a certain operating temperature range by adjusting the operating current of the laser array of at least one color in the light source assembly 100 to be low by the first value.

In a second possible implementation, the controller 500 is configured to: if the ambient temperature detected by the first temperature sensor 400 is higher than the first threshold temperature, the operating current of the at least one color laser array in the light source assembly 100 is turned down based on the positive correlation between the ambient temperature detected by the first temperature sensor 400 and the turning-down amount of the operating current of the at least one color laser array. That is, the higher the ambient temperature, the greater the amount of turndown in the operating current of the laser array of at least one color in the light source assembly 100. The lower the ambient temperature, the smaller the amount of turndown in the operating current of the laser array of at least one color in the light source assembly 100.

For example, taking the first threshold temperature as 35 degrees celsius as an example, if the reduction amount corresponding to the ambient temperature of 37 degrees celsius is Δt1 and the reduction amount corresponding to the ambient temperature of 39 degrees celsius is Δt2, the value of the reduction amount Δt2 is larger than the value of the reduction amount Δt1, so that the heating value of the laser array can be quickly reduced when the ambient temperature is 39 degrees celsius, and the operating temperature of the light source assembly 100 can be quickly reduced.

In some embodiments, there is a first correspondence between the operating current of the at least one color laser array in the light source assembly 100 and the heating value of the at least one color laser array in the light source assembly 100, and a second correspondence between the heating value of the at least one color laser array in the light source assembly 100 and the ambient temperature. The first correspondence and the second correspondence may be determined in advance through experiments, and the first correspondence and the second correspondence may be stored in a designated memory address in the controller 500. Therefore, the controller 500 may determine, based on the ambient temperature detected by the first temperature sensor 400, the amount of heat generated by the laser array of at least one color in the light source assembly 100 to be reduced according to the stored second correspondence, and determine, based on the stored first correspondence, the amount of reduction in the operating current of the laser array of at least one color in the light source assembly 100.

In some embodiments, the controller 500 is configured to: if the ambient temperature detected by the first temperature sensor 400 is higher than the first threshold temperature, the operating current of the laser array of each color in the light source assembly 100 is turned down based on the ambient temperature. The duty ratio of the amount of the current reduction of the laser arrays of each color in the total amount of current reduction corresponds to the duty ratio of the light emitted by the laser arrays in the light emitted by the light source assembly 100 as a whole, and the total amount of current reduction is the sum of the amounts of current reduction of the laser arrays of each color in the laser arrays of at least two colors. Therefore, it can be ensured that not only the temperature of the light source assembly 100 can be reduced but also the white balance of the picture projected by the laser projection apparatus 10 onto the projection screen can be ensured not to be destroyed after the operating current of the laser array of each color is adjusted down.

For example, the duty ratio of the amount of the decrease in the operating current of the laser array of each color in the light source assembly 100 to the total amount of decrease in the current may be equal to the duty ratio of the light emitted from the laser array to the light emitted from the light source assembly 100 as a whole.

In some embodiments of the present disclosure, if the ambient temperature is lower than the second threshold temperature, the operating current of the laser array of at least one color in the light source assembly 100 is adjusted to be high, so as to ensure that the operating temperature of the light source assembly 100 is stable within a certain operating temperature range, and the following two possible implementations are schematically illustrated in the embodiments of the present disclosure:

In a first possible implementation, the controller 500 is configured to: if the ambient temperature detected by the first temperature sensor 400 is lower than the second threshold temperature, the operating current of the laser array of at least one color in the light source assembly 100 is increased by a second value. The second value may be a fixed value. Therefore, when the ambient temperature in which the laser projection device 10 is located is low, the operating temperature of the light source assembly 100 can be ensured to be stable within a certain operating temperature range by adjusting the operating current of the laser array of at least one color in the light source assembly 100 to a second value.

In a second possible implementation, the controller 500 is configured to: if the ambient temperature detected by the first temperature sensor 400 is lower than the second threshold temperature, the operating current of the at least one color laser array in the light source assembly 100 is increased based on the positive correlation between the ambient temperature and the amount of decrease in the operating current of the at least one color laser array. That is, the lower the ambient temperature, the greater the amount of turnup of the operating current of the laser array of at least one color in the light source assembly 100. The higher the ambient temperature, the smaller the amount of turnup in the operating current of the laser array of at least one color in the light source assembly 100.

For example, taking the second threshold temperature as 25 degrees celsius as an example, if the rising amount corresponding to the ambient temperature is 20 degrees celsius is Δt3 and the rising amount corresponding to the ambient temperature is 15 degrees celsius is Δt4, the value of the rising amount Δt4 is greater than the value of the rising amount Δt3, so that the operating temperature of the light source assembly 100 can be quickly increased when the ambient temperature is 15 degrees celsius, so that the operating temperature of the light source assembly 100 is stabilized within a certain operating temperature range.

In some embodiments, the controller 500 is configured to: if the ambient temperature detected by the first temperature sensor 400 is lower than the second threshold temperature, the operating current of the laser array of each color in the light source assembly 100 is adjusted up based on the ambient temperature. The duty ratio of the current total increase amount of the operating current of the laser arrays of each color in the current total increase amount corresponds to the duty ratio of the light emitted by the laser arrays in the light emitted by the light source assembly 100 as a whole, and the current total increase amount is the sum of the current increase amounts of the laser arrays of each color in the laser arrays of at least two colors. Therefore, it is possible to ensure that, after the operating currents of the laser arrays of at least two colors are turned up, not only the operating temperature of the light source assembly 100 can be ensured to be stabilized within a certain operating temperature range, but also the white balance of the picture projected by the laser projection apparatus 10 to the projection screen can be ensured not to be destroyed.

For example, the duty ratio of the amount of the increase in the operating current of the laser array of each color in the light source assembly 100 to the total amount of the increase in the current may be equal to the duty ratio of the light emitted from the laser array to the light emitted from the light source assembly 100 as a whole.

To ensure the display effect of the laser projection device 10, the amount of adjustment (e.g., the amount of adjustment down or the amount of adjustment up) of the operating current of the laser array of at least one color in the light source assembly 100 is generally small. However, when the ambient temperature is high, the amount of reduction in the operating current of the laser array of at least one color in the light source assembly 100 may be correspondingly increased; when the ambient temperature is low, the amount of increase in the operating current of the laser array of at least one color in the light source assembly 100 may be correspondingly increased to protect the laser projection device 10.

In some embodiments, to ensure that the laser arrays in the light source assembly 100 are in normal operation, the adjusted operating current of each color of the laser arrays must not be lower than the minimum operating current of the laser arrays or higher than the maximum operating current of the laser arrays when the operating current of the laser arrays is adjusted.

In some embodiments, the controller 500 is further configured to: if the ambient temperature detected by the first temperature sensor 400 is higher than the third threshold temperature, the laser arrays of at least two colors in the light source assembly 100 are turned off.

In some embodiments, the third threshold temperature may be higher than the first threshold temperature, and some embodiments of the present disclosure are not limited in terms of the value of the third threshold temperature. For example, the third threshold temperature may be 40 degrees celsius. Therefore, damage to the light source assembly 100 caused by the excessive temperature can be prevented, and the long-term operation of the laser array in the laser projection device 10 in a high-temperature environment which is unfavorable for heat dissipation can be avoided, so that the laser array is protected, the light efficiency, the reliability and the service life of the light source assembly 100 are further improved.

Some embodiments of the present disclosure also provide a laser projection device 10, as shown in fig. 10, the laser projection device 10 may further include: a first fan 600 and a second temperature sensor 800.

As shown in fig. 9, the first fan 600 is located at the first air inlet, and the second temperature sensor 800 is located between the housing 101 and the light source assembly 100. The first fan 600 and the second temperature sensor 800 are coupled to the controller 500. The air outlet surface of the first fan 600 may face the light source assembly 100. The housing 101 also has a first air outlet.

The second temperature sensor 800 is configured to detect an operating temperature of the light source assembly 100.

The controller 500 is further configured to: if the operating temperature of the light source assembly 100 detected by the second temperature sensor 800 is higher than the third threshold temperature and lower than the fourth threshold temperature, the first fan 600 is controlled to blow air to the first air inlet, so that the air enters the housing from the first air inlet. The value of the third threshold temperature and the value of the fourth threshold temperature are not limited in the embodiments of the present disclosure, and the following embodiments exemplify that the fourth threshold temperature is 50 degrees celsius and the third threshold temperature is 45 degrees celsius.

For example, taking the fourth threshold temperature as 50 degrees celsius and the third threshold temperature as 45 degrees celsius as an example, if the operating temperature of the light source assembly 100 detected by the second temperature sensor 800 is higher than the third threshold temperature and lower than the fourth threshold temperature, the laser projection device 10 may control the first fan 600 to blow through the controller 500, and the wind blown by the first fan 600 may enter the housing 101 from the first air inlet of the housing 101 and be discharged from the first air outlet of the housing 101. Therefore, the operating temperature of the light source assembly 100 can be reduced, and thus the operating temperature of the light source assembly 100 is lower. In addition, the light efficiency, reliability and service life of the light source assembly 100 can be effectively improved, so that the display effect of the picture projected by the laser projection device 10 is better.

In some embodiments, the first fan 600 may include: the fan body and fan motor (obscured in fig. 9, not visible). The fan motor in the first fan 600 has a drive shaft, which may be connected to the fan body in the first fan 600, and the fan motor in the first fan 600 may be coupled to the controller 500 in the laser projection device 10. Therefore, if the working temperature of the light source assembly 100 is higher than the third threshold temperature and lower than the fourth threshold temperature, the controller 500 in the laser projection device 10 can control the driving shaft of the fan motor in the first fan 600 to rotate so as to drive the fan body in the first fan 600 to rotate, so that the rotating fan body can blow air towards the first air inlet of the housing 101, and the air blown by the first fan 600 can enter the housing 101 from the first air inlet of the housing 101 and be discharged from the first air outlet of the housing 101, so as to reduce the working temperature of the light source assembly 100.

In some embodiments, as shown in fig. 9 and 10, the laser projection device 10 may further include a first heat sink 700, the first heat sink 700 being in contact with the light source assembly 100 and located at the first air outlet of the housing 101.

In some embodiments, as shown in fig. 11, the first heat sink 700 includes: a first heat conduction block 701, a heat conduction pipe 702, and a first heat radiation fin 703. The first heat conductive block 701 is in contact with one side of the light source assembly 100, and one end of the heat conductive pipe 702 is connected to the first heat conductive block 701 and the other end is connected to the first heat dissipation fin 703. Therefore, the heat generated by the light source assembly 100 can be transferred to the heat conduction pipe 702 through the first heat conduction block 701, and quickly transferred to the external environment of the laser projection device 10 through the first air outlet in the housing 101 through the heat conduction pipe 702 and the first heat dissipation fins 703, so that the heat transfer efficiency of the first heat sink 700 can be improved, and the temperature of the light source assembly 100 can be reduced.

In some embodiments, as shown in fig. 9 and 10, the laser projection device 10 may further include: the second fan 1000 is located at one side of the first heat spreader 700 near the first air outlet of the housing 101, the second fan 1000 is coupled to the controller 500, and the air outlet of the second fan 1000 faces the first air outlet of the housing 101.

The controller 500 is further configured to: if the operating temperature of the light source assembly 100 is higher than the third threshold temperature and lower than the fourth threshold temperature, the second fan 1000 is controlled to blow air to the first air outlet of the housing 101. Therefore, if the working temperature of the light source assembly 100 detected by the second temperature sensor 800 is higher than the third threshold temperature and lower than the fourth threshold temperature, the laser projection device 10 can control the second fan 1000 to blow air through the controller 500, so as to quickly transfer the heat generated by the light source assembly 100 to the external environment, thereby reducing the temperature of the light source assembly 100.

In some embodiments, the second fan 1000 may include: the fan body and fan motor (obscured in fig. 9, not visible). The fan body of the second fan 1000 may be connected with the first heat dissipation fins 703 of the first heat sink 700. The fan motor in the second fan 1000 has a drive shaft, which may be connected to the fan body in the second fan 1000, and the fan motor in the second fan 1000 may be coupled to the controller 500 in the laser projection device 10. Therefore, if the working temperature of the light source assembly 100 is higher than the third threshold temperature and lower than the fourth threshold temperature, the controller 500 in the laser projection device 10 can control the driving shaft of the fan motor in the second fan 1000 to rotate so as to drive the fan body in the second fan 1000 to rotate, so that the rotating fan body can blow air towards the first air outlet of the housing 101, thereby transferring the heat of the light source assembly 100 to the first heat dissipation fins 703 to the outside environment through the first air outlet in the housing 101, and improving the heat dissipation efficiency of the first heat sink 700.

The embodiments of the present disclosure are not limited to the number of second fans.

In some embodiments, the controller 500 is further configured to: based on the positive correlation between the operating temperature of the light source assembly 100 and the rotational speeds of the first fan and the second fan, the rotational speeds of the first fan 600 and the second fan 1000 are adjusted to rapidly reduce the operating temperature of the light source assembly. That is, the higher the operating temperature of the light source assembly 100, the higher the rotational speed of the first fan 600 and the rotational speed of the second fan 1000; the lower the operating temperature of the light source assembly 100, the lower the rotational speed of the first fan 600 and the rotational speed of the second fan 1000.

In some embodiments, if the operating temperature of the light source assembly 100 is higher, the controller 500 may adjust the rotation speed of the first fan 600 and the rotation speed of the second fan 1000 to increase the air volume entering the first air inlet of the housing 101 and the heat dissipation efficiency of the first heat sink 700, so that the operating temperature of the light source assembly 100 can be quickly reduced below the third threshold temperature. If the working temperature of the light source assembly 100 is low, the controller 500 can reduce the rotation speed of the first fan 600 and the rotation speed of the second fan 1000 to reduce the air quantity entering the first air inlet of the housing 101 and the heat dissipation efficiency of the first heat sink 700, thereby reducing the noise emitted by the first fan 600 and the second fan 1000, and further reducing the working noise of the laser projection device 10.

In some embodiments, a correspondence relationship between the rotational speeds of the first and second fans 600 and 1000 and the operating temperature of the light source assembly 100 may be predetermined, so that after the controller 500 determines the operating temperature of the light source assembly 100, the first and second fans 600 and 1000 may be controlled to rotate at the respective rotational speeds based on the correspondence relationship, so that the first and second fans 600 and 1000 can lower the operating temperature of the light source assembly 100 below the third threshold temperature more quickly.

In some embodiments, the controller 500 is further configured to: if the operating temperature of the light source assembly 100 detected by the second temperature sensor 800 is higher than the fourth threshold temperature, the laser arrays of at least two colors of the light source assembly 100 are turned off. Therefore, the condition that the operating temperature of the laser array in the laser projection device 10 is high for a long time can be avoided, thereby protecting the laser array, further improving the light efficiency, reliability and service life of the laser array.

When the laser projection device 10 is in operation, the DMD 240 generates a certain amount of heat. As shown in fig. 9 and 10, the casing 101 has a second air outlet (located on the right side in fig. 9) provided opposite to the first air outlet (located on the left side in fig. 9). The laser projection device 10 may further include: a second heat sink 900 for dissipating heat from the DMD 240, and a third fan 1100 disposed on a side of the second heat sink 900 near the second air inlet of the housing 101. The air outlet of the third fan 1100 faces the DMD 240, and the third fan 1100 is coupled to the controller 500.

The controller 500 is further configured to: if the operating temperature of the light source assembly 100 detected by the second temperature sensor 800 is higher than the third threshold temperature and lower than the fourth threshold temperature, the third fan 1100 is controlled to blow air to the DMD 240. Therefore, if the second temperature sensor 800 detects that the operating temperature of the light source assembly 100 is higher than the third threshold temperature and lower than the fourth threshold temperature, the laser projection device 10 may control the third fan 1100 to blow by the controller 500, and the third fan 1100 may blow a portion of the wind entering the housing 101 from the second air inlet of the housing 101 to the DMD 240 and discharge the wind from the second air outlet of the housing 101. The heat generated by the DMD 240 can be transferred to the external environment through the second heat sink 900 and the third fan 1100, so that the working temperature of the DMD 240 inside the housing 101 is effectively reduced, the working temperature of the DMD 240 is further lower, the reliability and the service life of the DMD 240 can be effectively improved, and the display effect of the image projected by the laser projection device 10 is better.

In some embodiments, as shown in fig. 12, the second heat sink 900 may include: a second heat conduction block 901 and a second heat dissipation fin 902. One surface of the second heat conduction block 901 is in contact with one side of the DMD 240, and the other surface of the second heat conduction block 901 is connected to two heat dissipation fins 902. Therefore, the heat generated by the DMD 240 can be transferred to the second heat radiating fins 902 through the second heat conductive block 901, improving the heat transfer efficiency of the second heat sink 900.

In some embodiments, the third fan 1100 may include: the fan body and fan motor (obscured in fig. 9, not visible). The fan body of the third fan 1100 may be connected to the second heat radiation fins 902 of the second heat sink 900. The fan motor in the third fan 1100 has a drive shaft, which may be connected to the fan body in the third fan 1100, and the fan motor in the third fan 1100 may be coupled to the controller 500 in the laser projection device 10. Therefore, if the working temperature of the light source assembly 100 is higher than the third threshold temperature and lower than the fourth threshold temperature, the controller 500 in the laser projection device 10 can control the driving shaft of the fan motor in the third fan 1100 to rotate so as to drive the fan body in the third fan 1100 to rotate, so that the rotating fan body can blow the DMD 240, thereby transferring the heat of the DMD 240 to the second heat dissipating fins 902, and rapidly transferring the heat to the external environment through the second air opening in the housing 101, so as to improve the heat dissipating efficiency of the second heat sink 900.

In some embodiments, the controller 500 in the laser projection device 10 is further configured to: based on the positive correlation between the operating temperature of the light source assembly 100 and the rotational speed of the third fan 1100, the rotational speed of the third fan 1100 is adjusted to reduce the operating temperature of the DMD 240 below the third threshold temperature. That is, the higher the operating temperature of the light source assembly 100, the higher the rotational speed of the third fan 1100; the lower the operating temperature of the light source assembly 100, the lower the rotational speed of the third fan 1100.

In some embodiments, if the operating temperature of the light source assembly 100 is high, the controller 500 may increase the rotation speed of the third fan 1100 to increase the heat dissipation efficiency of the second heat sink 900, so that the operating temperature of the DMD 240 can be quickly reduced below the third threshold temperature. If the operating temperature of the light source assembly 100 is low, the controller 500 may reduce the rotation speed of the third fan 1100 to reduce the heat dissipation efficiency of the second heat sink 900, thereby reducing the noise emitted by the third fan 1100 and further reducing the operating noise of the laser projection device 10.

In some embodiments, a correspondence relationship between the rotational speed of the third fan 1100 and the operating temperature of the light source assembly 100 may be predetermined, so that after the controller 500 determines the operating temperature of the light source assembly 100, the third fan 1100 may be controlled to rotate at the corresponding rotational speed based on the correspondence relationship, so that the third fan 1100 can more quickly adjust the operating temperature of the DMD 240 below the third threshold temperature.

In some embodiments, as shown in fig. 9, the laser projection device 10 may further include: an electronic board 1200. The controller 500 may be integrated in the electronic card 1200. In one possible implementation, the electronic board 1200 is disposed parallel to the bottom of the housing, facilitating heat dissipation from the electronic board 1200.

In some embodiments, as shown in fig. 9 and 10, the laser projection device 10 may further include: a fourth fan 1300 at the second air outlet of the housing 101. The air outlet of the fourth fan 1300 faces the second air outlet of the housing 101, and the fourth fan 1300 is coupled to the controller 500.

The controller 500 is further configured to: if the operating temperature of the light source assembly 100 detected by the second temperature sensor 800 is higher than the third threshold temperature and lower than the fourth threshold temperature, the fourth fan 1300 is controlled to blow. Therefore, if the working temperature of the light source assembly 100 detected by the second temperature sensor 800 is higher than the third threshold temperature and lower than the fourth threshold temperature, the laser projection device 10 can control the fourth fan 1300 to blow through the controller 500, so as to quickly transfer the heat generated by the DMD 240 to the external environment, thereby improving the heat dissipation efficiency of the second heat sink 900.

In some embodiments, the fourth fan 1300 may include: the fan body and fan motor (obscured in fig. 9, not visible). The fan motor in the fourth fan 1300 has a drive shaft, which may be connected to the fan body in the fourth fan 1300, and the fan motor in the fourth fan 1300 may be coupled to the controller 500 in the laser projection device 10. Therefore, if the working temperature of the light source assembly 100 is higher than the third threshold temperature and lower than the fourth threshold temperature, the controller 500 in the laser projection 10 can control the driving shaft of the fan motor in the fourth fan 1300 to rotate so as to drive the fan body in the third fan 1100 to rotate, so that the rotating fan body can blow air through the second air outlet of the housing 101, thereby rapidly transferring the heat generated by the DMD 240 to the external environment through the second air outlet of the housing 101, and improving the heat dissipation efficiency of the second heat sink 900.

In some embodiments, the controller 500 in the laser projection device 10 is further configured to: based on the positive correlation between the operating temperature of the light source assembly 100 and the rotational speed of the fourth fan 1300, the rotational speed of the fourth fan 1300 is adjusted to reduce the operating temperature of the DMD 240 below the third threshold temperature. That is, the higher the operating temperature of the light source assembly 100, the higher the rotational speed of the fourth fan 1300; the lower the operating temperature of the light source assembly 100, the lower the rotational speed of the fourth fan 1300.

In some embodiments, if the operating temperature of the light source assembly 100 is high, the controller 500 may increase the rotation speed of the fourth fan 1300 to increase the heat dissipation efficiency into the second heat sink 900, so that the operating temperature of the DMD 240 can be quickly reduced below the third threshold temperature. If the operating temperature of the light source assembly 100 is low, the controller 500 may reduce the rotation speed of the fourth fan 1300 to reduce the heat dissipation efficiency of the second heat sink 900, thereby reducing the noise emitted by the fourth fan 1300 and further reducing the operating noise of the laser projection apparatus 10.

In some embodiments, a correspondence between the rotational speed of the fourth fan 1300 and the operating temperature of the light source assembly 100 may be predetermined, so that after the controller 500 determines the operating temperature of the light source assembly 100, the fourth fan 1300 may be controlled to rotate at the corresponding rotational speed based on the correspondence, so that the fourth fan 1300 may be able to more quickly adjust the operating temperature of the DMD 240 below the third threshold temperature.

The present disclosure is not limited to the number of fourth fans, and the number of fourth fans 1300 may be two, or in other implementations, the number of fourth fans 1300 may be plural.

In some embodiments, as shown in fig. 9, the laser projection device 10 may further include: a lens 300 positioned in the housing 101, and a heat shield 1400 positioned between the lens 300 and the light source assembly 100. Therefore, the heat insulation board 1400 can prevent the heat generated by the light source assembly 100 from being transferred to the lens 300, so as to reduce the probability of deformation of the optical lens in the lens 300 due to heating, and make the display effect of the image projected by the laser projection device 10 better.

Some embodiments of the present disclosure also provide a laser projection system, which may be an ultra-short focal laser projection system. In some embodiments, as shown in fig. 13, the laser projection system may include: a projection screen 20 and a laser projection device 10. The laser projection device 10 may be the laser projection device of the above-described embodiment.

When the laser projection device 10 is in operation, the laser projection device 10 may emit light obliquely upward so that the laser projection device 10 may project a picture onto the projection screen 20.

Some embodiments of the present disclosure also provide a control method of a laser projection device, which may be any of the laser projection devices 10 of the above embodiments. As shown in fig. 14, the control method includes steps 140-142.

And 140, acquiring the ambient temperature of the laser projection equipment.

In some embodiments, the ambient temperature at which the laser projection device 10 is located may be detected by a first temperature sensor 400 in the laser projection device 10, and the controller 500 receives the ambient temperature from the first temperature sensor 400.

Step 141, if the ambient temperature is lower than the second threshold temperature, adjusting the working current of the laser array of at least one color in the laser projection device based on the negative correlation between the ambient temperature and the adjustment amount of the working current of the laser array of at least one color.

In some embodiments, when the operating current of the at least one color laser array is turned up, the operating current of each of the at least two color laser arrays may be turned up based on the ambient temperature. The duty ratio of the increasing amount of the working current of the laser arrays of each color in the total increasing amount of the current corresponds to the duty ratio of light rays emitted by the laser arrays in light rays emitted by the laser arrays of at least two colors in the whole; the total current rise amount is the sum of the current rise amounts of the laser arrays of the respective colors in the laser arrays of the at least two colors.

Step 142, if the ambient temperature is higher than the first threshold temperature, adjusting the working current of the laser array of at least one color in the laser projection device based on the positive correlation between the ambient temperature and the adjustment amount of the working current of the laser array of at least one color.

In some embodiments, when the operating current of the at least one color laser array is turned down, the operating current of each of the at least two color laser arrays may be turned down based on the ambient temperature. The duty ratio of the reduction amount of the working current of the laser arrays of each color in the total reduction amount of the current corresponds to the duty ratio of light rays emitted by the laser arrays in light rays emitted by the laser arrays of at least two colors in the whole; the total current reduction amount is a sum of current reduction amounts of the laser arrays of the respective colors of the laser arrays of the at least two colors.

According to the control method of the laser projection device, provided by some embodiments of the present disclosure, by acquiring the ambient temperature of the laser projection device, if the ambient temperature is higher than a first threshold temperature or lower than a second threshold temperature, the working current of at least one of the laser arrays of at least two colors is adjusted. Therefore, when the ambient temperature is high, the working current of the laser array is reduced, so that the heat generated by the laser array is reduced. Therefore, the operating temperature of the light source assembly 100 can be reduced without increasing the rotational speed of the cooling fan in the laser projection device 10, thereby reducing the operating noise of the laser projection device 10, and improving the light efficiency, reliability, and lifetime of the laser array in the light source assembly 100.

Some embodiments of the present disclosure provide a computer readable storage medium (e.g., a non-transitory computer readable storage medium) having stored therein computer program instructions that, when run on a laser projection device, cause the laser projection device to perform a method of controlling a laser projection device as described in any of the above embodiments.

In some embodiments, the computer readable storage medium described above may include, but is not limited to: magnetic storage devices (e.g., hard Disk, floppy Disk or tape, etc.), optical disks (e.g., compact Disk (CD), digital versatile Disk (Digital Versatile Disk, DVD), etc.), smart cards, and flash Memory devices (e.g., erasable programmable read-Only Memory (EPROM), cards, sticks, key drives, etc.). Various computer-readable storage media described in this disclosure may represent one or more devices and/or other machine-readable storage media for storing information. The term "machine-readable storage medium" can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.

Some embodiments of the present disclosure also provide a computer program product, for example, stored on a non-transitory computer readable storage medium. The computer program product comprises computer program instructions which, when executed on a laser projection device, cause the laser projection device to perform the method of controlling a laser projection device as described in the above embodiments.

Some embodiments of the present disclosure also provide a computer program. The computer program, when executed on a computer, causes the computer to perform the method of controlling a laser projection device as described in the above embodiments.

The beneficial effects of the computer readable storage medium, the computer program product and the computer program are the same as those of the control method of the laser projection device described in some embodiments, and are not described herein. The foregoing is merely a specific embodiment of the disclosure, but the protection scope of the disclosure is not limited thereto, and any person skilled in the art who is skilled in the art will recognize that changes or substitutions are within the technical scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

A laser projection device, comprising:

a light source assembly comprising an array of lasers of at least two colors and configured to provide an illumination beam;

a first temperature sensor configured to detect an ambient temperature at which the laser projection device is located;

the controller is configured to:

if the ambient temperature is higher than a first threshold temperature, based on the positive correlation between the ambient temperature and the reduction amount of the working current of the laser array of at least one color, reducing the working current of the laser array of at least one color;

if the ambient temperature is lower than a second threshold temperature, adjusting the working current of the laser array of at least one color based on the negative correlation between the ambient temperature and the adjustment amount of the working current of the laser array of at least one color; the second threshold temperature is less than the first threshold temperature.
The laser projection device of claim 1, wherein,

the controller is configured to: based on the ambient temperature, lowering the operating current of each of the at least two color laser arrays; the duty ratio of the lower amount of the working current of the laser arrays of each color in the total lower amount of the current corresponds to the duty ratio of the light rays emitted by the laser arrays in the light rays emitted by the laser arrays of at least two colors; the total current reduction amount is a sum of current reduction amounts of the laser arrays of the respective colors of the at least two colors of laser arrays.
The laser projection device of claim 1, wherein,

the controller is configured to: based on the ambient temperature, increasing the operating current of each of the at least two color laser arrays; the duty ratio of the increasing amount of the working current of the laser arrays of each color in the total increasing amount of the current corresponds to the duty ratio of the light rays emitted by the laser arrays in the light rays emitted by the laser arrays of at least two colors; the total current rise amount is a sum of current rise amounts of the laser arrays of the respective colors of the at least two colors of laser arrays.
The laser projection device of any of claims 1 to 3, further comprising: the shell is provided with a first air inlet, and the first temperature sensor is positioned at the first air inlet of the shell.
The laser projection device of claim 4, further comprising: a first fan at the first air inlet, and a second temperature sensor between the housing and the light source assembly, both the first fan and the second temperature sensor being coupled to the controller;

The second temperature sensor is configured to detect the working temperature of the light source assembly;

the controller is further configured to: if the working temperature of the light source assembly detected by the second temperature sensor is higher than a third threshold temperature and lower than the fourth threshold temperature, controlling the first fan to blow air to the first air inlet so that the air enters the shell from the first air inlet; the third threshold temperature is less than the fourth threshold temperature.
The laser projection device of claim 5, the housing further having a first air outlet, the laser projection device further comprising: the first radiator is contacted with the light source assembly and positioned at the first air outlet, and the second fan is positioned at one side of the first radiator close to the first air outlet, the second fan is coupled with the controller, and the air outlet surface of the second fan faces the first air outlet;

the controller is further configured to: and if the working temperature of the light source assembly is higher than the third threshold temperature and lower than the fourth threshold temperature, controlling the second fan to blow air to the first air outlet so as to blow the air out of the first air outlet.
The laser projection device of claim 6, wherein,

the controller is further configured to: and adjusting the rotating speeds of the first fan and the second fan based on the positive correlation between the working temperature of the light source assembly and the rotating speeds of the first fan and the second fan.
The laser projection device of claim 7, wherein the housing further has a second air outlet disposed opposite the first air outlet, the laser projection device further comprising:

a digital micromirror device configured to modulate the illumination beam;

a second heat sink in contact with the digital micromirror device;

the third fan is positioned at one side of the second radiator, which is close to the second air inlet of the shell;

the controller is coupled with the third fan and is further configured to: and if the working temperature of the light source assembly detected by the second temperature sensor is higher than the third threshold temperature and lower than the fourth threshold temperature, controlling the third fan to blow air to the digital micromirror device.
The laser projection device of claim 8, further comprising:

the fourth fan is positioned at the second air outlet of the shell, and the air outlet surface of the fourth fan faces the second air outlet;

The controller is coupled with the fourth fan and is further configured to: and if the working temperature of the light source assembly detected by the second temperature sensor is higher than the third threshold temperature and lower than the fourth threshold temperature, controlling the fourth fan to blow.
The laser projection device of claim 9, further comprising:

a lens located within the housing;

the heat insulation plate is positioned between the lens and the light source component.
A control method of a laser projection apparatus, comprising:

acquiring the ambient temperature of the laser projection equipment;

if the ambient temperature is higher than a first threshold temperature, based on the positive correlation between the ambient temperature and the reduction amount of the working current of the laser array of at least one color, reducing the working current of the laser array of at least one color;

if the ambient temperature is lower than a second threshold temperature, adjusting the working current of the laser array of at least one color based on the negative correlation between the ambient temperature and the adjustment amount of the working current of the laser array of at least one color; the second threshold temperature is less than the first threshold temperature.
The method of claim 11, wherein the reducing the operating current of the at least one color laser array based on the ambient temperature being in positive correlation with the reducing the operating current of the at least one color laser array if the ambient temperature is above a first threshold temperature comprises:

based on the ambient temperature, lowering the operating current of each of the at least two color laser arrays; the duty ratio of the lower amount of the working current of the laser arrays of each color in the total lower amount of the current corresponds to the duty ratio of the light rays emitted by the laser arrays in the light rays emitted by the laser arrays of at least two colors; the total current reduction amount is a sum of current reduction amounts of the laser arrays of the respective colors of the at least two colors of laser arrays.
The method of claim 11, wherein the reducing the operating current of the at least one color laser array based on the ambient temperature being in positive correlation with the reducing the operating current of the at least one color laser array if the ambient temperature is above a first threshold temperature comprises:

Based on the ambient temperature, increasing the operating current of each of the at least two color laser arrays; the duty ratio of the increasing amount of the working current of the laser arrays of each color in the total increasing amount of the current corresponds to the duty ratio of the light rays emitted by the laser arrays in the light rays emitted by the laser arrays of at least two colors; the total current rise amount is a sum of current rise amounts of the laser arrays of the respective colors of the at least two colors of laser arrays.
A laser projection device, comprising:

a light source assembly comprising an array of lasers of at least two colors and configured to provide an illumination beam;

a first temperature sensor configured to detect an ambient temperature at which the laser projection device is located;

the controller is configured to:

if the ambient temperature is higher than a first threshold temperature, reducing the working current of the laser array of at least one color by a first value;

if the ambient temperature is lower than a second threshold temperature, the working current of the laser array with at least one color is increased by a second value; the second threshold temperature is less than the first threshold temperature.
A laser projection device, comprising:

the shell is provided with a first air inlet;

a light source assembly comprising an array of lasers of at least two colors and configured to provide an illumination beam;

a first temperature sensor located at the first air inlet of the housing and configured to detect an ambient temperature at which the laser projection device is located;

a controller is coupled to the light source assembly and the first temperature sensor and configured to adjust an operating current of the at least one color laser array based on the ambient temperature.
The laser projection device of claim 15, further comprising:

the first fan is positioned at the first air inlet;

a second temperature sensor located between the housing and the light source assembly and configured to detect an operating temperature of the light source assembly;

the controller is coupled with the first fan and the second temperature sensor and is further configured to: and controlling the first fan to blow air to the first air inlet according to the working temperature of the light source assembly so that the air enters the shell from the first air inlet.
The laser projection device of claim 16, wherein the housing further has a first air outlet, the laser projection device further comprising:

The first radiator is in contact with the light source assembly and is positioned at the first air outlet;

the second fan is positioned at one side of the first radiator close to the first air outlet, and the air outlet surface of the second fan faces the first air outlet;

the controller is coupled with the second fan and is further configured to: and controlling the second fan to blow air to the first air outlet according to the working temperature of the light source assembly so as to blow the air out of the first air outlet.
The laser projection device of claim 17, wherein the housing further has a second air outlet disposed opposite the first air outlet, the laser projection device further comprising:

a digital micromirror device configured to modulate the illumination beam;

a second heat sink in contact with the digital micromirror device;

the third fan is positioned at one side of the second radiator, which is close to the second air inlet of the shell;

the controller is coupled with the third fan and is further configured to: and controlling the third fan to blow air to the digital micromirror device according to the working temperature of the light source assembly.
The laser projection device of claim 18, further comprising:

The fourth fan is positioned at the second air outlet of the shell, and the air outlet surface of the fourth fan faces the second air outlet;

the controller is coupled with the fourth fan and is further configured to: and controlling the fourth fan to blow according to the working temperature of the light source assembly.
The laser projection device of claim 19, further comprising:

a lens located within the housing;

the heat insulation plate is positioned between the lens and the light source component.