Laser projection equipment, laser projection equipment heat dissipation method and heat dissipation device

Abstract

The present invention discloses a laser projection device, a heat dissipation method for the laser projection device, and a heat dissipation device, which belong to the field of imaging technology. The temperature detection component in the laser projection device is used to obtain the temperature of the red laser during operation; the processing component is used to control the radiator to dissipate heat from the red laser so that the temperature of the red laser is between a first temperature value and a second temperature value. The first temperature value is the highest temperature value at which the color ratio of the red laser emitted by the red laser in the imaging picture of the laser projection device deviates less than a specified value, and the second temperature value is the lowest temperature value at which the color ratio of the red laser emitted by the red laser in the imaging picture of the laser projection device deviates less than a specified value. This solves the problem that the heat dissipation method of the laser projection device in the related art is not comprehensive enough and it is difficult to ensure the imaging effect of the laser projection device, thereby achieving the effect of effectively ensuring the imaging quality of the laser projection device.

Description

Technical Field

[0001] The present invention relates to the field of imaging technology, and in particular to a laser projection device, a heat dissipation method for the laser projection device, and a heat dissipation device. Background Art

[0002] A laser projector is a device that uses laser light to generate images and project them onto a screen. Laser projectors contain lasers, which generate heat as they emit laser light, causing the laser to heat up. Furthermore, ambient temperature can also affect the laser's temperature. High ambient temperatures increase the laser's temperature, which can affect its luminous efficiency and shorten its lifespan. Therefore, cooling the laser during operation can help stabilize its luminous efficiency.

[0003] A laser projection device in the related art is equipped with a radiator in the laser projection device, wherein the radiator includes at least one fan or heat sink; the maximum temperature value at which the laser can maintain normal operation and the current ambient temperature are obtained, the rotation speed of the fan in the radiator is calculated based on the above temperature values, and the fan rotation is controlled according to the currently calculated rotation speed value to dissipate heat from the laser projection device.

[0004] A common concern in related technologies is that rising temperatures can affect the laser's luminous efficiency, leading to color casts in the images produced by laser projection devices. However, laser projection devices can operate in temperatures ranging from a few degrees to tens of degrees Celsius, and the heat dissipation methods used in these technologies are inadequate, making it difficult to guarantee image quality. Summary of the Invention

[0005] The embodiments of the present invention provide a laser projection device, a heat dissipation method for the laser projection device, and a heat dissipation device. The technical solution is as follows:

[0006] According to one aspect of the present invention, a laser projection device is provided.

[0007] The laser projection device includes a laser component, a temperature detection component, a processing component and a heat sink, wherein the laser component includes lasers of at least two colors, wherein the lasers of at least two colors include a red laser;

[0008] The temperature detection component is used to obtain the temperature of the red laser during operation;

[0009] The processing component is used to control the radiator to dissipate heat from the red laser so that the temperature of the red laser is between a first temperature value and a second temperature value, wherein the first temperature value is a maximum temperature value at which the color ratio of the red laser emitted by the red laser in the imaging picture of the laser projection device deviates less than a specified value, and the second temperature value is a minimum temperature value at which the color ratio of the red laser emitted by the red laser in the imaging picture of the laser projection device deviates less than a specified value.

[0010] Optionally, the processing component is used to:

[0011] Determine the temperature value to be determined;

[0012] Obtaining a shift ratio between the undetermined temperature value and the first temperature value with respect to a color coordinate of an imaging screen of the laser projection device;

[0013] When the offset rate is less than a target value, determining the undetermined temperature value as the second temperature value;

[0014] When the offset rate is not less than the target value, the undetermined temperature value is adjusted, and the step of obtaining the offset rate of the color coordinates of the imaging screen of the laser projection device between the undetermined temperature value and the first temperature value is performed.

[0015] Optionally, the processing component is further configured to:

[0016] The offset ratio of the color coordinates of the imaging screen of the laser projection device to the color coordinates of the undetermined temperature value and the first temperature value is determined according to a preset formula, wherein the preset formula includes:

[0017]

[0018] The n is the offset rate, the X2 is the coordinate value of the red color in the imaging picture on the color coordinate x-axis when the first temperature value is set, and the X1 is the coordinate value of the red color in the imaging picture on the color coordinate x-axis when the undetermined temperature value is set.

[0019] Optionally, the radiator includes a heat sink and two fans located on both sides of the heat sink.

[0020] The processing component is further configured to:

[0021] determining a third temperature value between the first temperature value and the second temperature value;

[0022] When the temperature of the laser is higher than the third temperature value, controlling the two fans to run simultaneously;

[0023] When the temperature of the laser is lower than the third temperature value, one of the two fans is controlled to operate and the other fan is controlled to be turned off.

[0024] Optionally, the fan has a first speed and a second speed, the first speed is less than the second speed, and the processing component is further configured to:

[0025] When the temperature of the laser is lower than the third temperature, turning off one of the two fans and controlling the other fan to run at the first speed;

[0026] When the temperature of the laser is higher than the first temperature, the two fans are controlled to operate at the second speed.

[0027] Optionally, the difference between the first temperature value and the third temperature value is smaller than the difference between the third temperature value and the second temperature value.

[0028] According to another aspect of the present invention, a heat dissipation method for a laser projection device is provided. The laser projection device includes a laser assembly and a heat sink. The laser assembly includes lasers of at least two colors, wherein the lasers of the at least two colors include a red laser. The method includes:

[0029] Acquiring a first temperature value during operation of the red laser, the first temperature value being a maximum temperature value at which a color ratio of red laser light emitted by the red laser in an image imaged by the laser projection device deviates less than a specified value;

[0030] Acquiring a second temperature value when the red laser is in operation, the second temperature value being a lowest temperature value at which a deviation of a color ratio of red laser light emitted by the red laser in an image imaged by the laser projection device is less than a specified value;

[0031] The heat sink is controlled so that the temperature of the red laser is between the first temperature value and the second temperature value.

[0032] Optionally, obtaining a second temperature value when the red laser is running includes:

[0033] Determine the temperature value to be determined;

[0034] Obtaining a shift ratio between the undetermined temperature value and the first temperature value with respect to a color coordinate of an imaging screen of the laser projection device;

[0035] When the offset rate is less than a target value, determining the undetermined temperature value as the second temperature value;

[0036] When the offset rate is not less than the target value, the undetermined temperature value is adjusted, and the step of obtaining the offset rate of the color coordinates of the imaging screen of the laser projection device between the undetermined temperature value and the first temperature value is performed.

[0037] Optionally, obtaining the offset ratio of the color coordinates of the imaging screen of the laser projection device between the undetermined temperature value and the first temperature value includes:

[0038] The offset ratio of the color coordinates of the imaging screen of the laser projection device to the color coordinates of the undetermined temperature value and the first temperature value is determined according to a preset formula, wherein the preset formula includes:

[0039]

[0040] The n is the offset rate, the X2 is the coordinate value of the red color in the imaging picture on the color coordinate x-axis when the first temperature value is set, and the X1 is the coordinate value of the red color in the imaging picture on the color coordinate x-axis when the undetermined temperature value is set.

[0041] According to another aspect of the present invention, a heat dissipation device for a laser projection device is provided. The laser projection device includes a laser assembly and a heat sink. The laser assembly includes lasers of at least two colors, wherein the lasers of the at least two colors include a red laser. The device includes:

[0042] a first temperature acquisition module, configured to acquire a first temperature value of the red laser during operation, the first temperature value being a maximum temperature value at which a color ratio of the red laser emitted by the red laser in an image of the laser projection device deviates less than a specified value;

[0043] a second temperature acquisition module, configured to acquire a second temperature value when the red laser is in operation, the second temperature value being a minimum temperature value at which a color ratio of the red laser light emitted by the red laser in an image of the laser projection device deviates less than a specified value;

[0044] A control module is configured to control the radiator so that the temperature of the red laser is between the first temperature value and the second temperature value.

[0045] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0046] A laser projection device is provided, comprising a laser assembly, a temperature detection assembly, a processing assembly, and a heat sink. The temperature of a red laser during operation is detected by the temperature detection assembly, and the temperature of the laser is regulated by the heat sink so that the temperature of the laser is maintained between a first temperature value and a second temperature value during operation. This reduces the degree of color cast during operation of the laser, thereby achieving more comprehensive temperature control of the laser projection device. This solves the problem in related arts that the heat dissipation methods of laser projection devices are not comprehensive enough, making it difficult to ensure the imaging effect of the laser projection device, thereby effectively ensuring the imaging quality of the laser projection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0048] Figure 1 1 is a schematic structural diagram of a laser projection device according to an embodiment of the present invention;

[0049] Figure 2 A schematic structural diagram of a radiator provided in this application;

[0050] Figure 3 1 is a schematic structural diagram of a laser projection device according to an embodiment of the present invention;

[0051] Figure 4 This is a flow chart of a heat dissipation method for a laser projection device according to an embodiment of the present invention;

[0052] Figure 5 is a flow chart of another heat dissipation method for a laser projection device according to an embodiment of the present invention;

[0053] Figure 6 The figure is a schematic structural diagram of a heat dissipation device of a laser projection device shown in an embodiment of the present invention.

[0054] The above drawings illustrate specific embodiments of the present invention, which will be described in more detail below. These drawings and the accompanying description are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0055] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0056] In the early days of laser projection technology, monochromatic lasers were often used. With the rapid development of laser technology, to improve the quality of laser projection displays, monochromatic lasers were gradually replaced with full-color lasers that can emit three colors of laser light (red, blue, and green). Full-color lasers are more sensitive to temperature, and the luminous efficiency of red lasers increases significantly at low temperatures, resulting in a reddish cast in the image and poor image quality.

[0057] Secondly, with the development of laser projection technology, the size of projection equipment is getting smaller and smaller, and the size of various components inside the projection equipment is shrinking accordingly. When the laser is reduced in size, its own heat dissipation area is also reduced, which makes heat dissipation more difficult.

[0058] One type of laser projection device in the related art, which uses a monochromatic laser, adjusts the heat sink's operating mode based solely on the maximum temperature at which the laser can maintain normal operation. However, when the ambient temperature is too low or the heat sink is overheating—for example, when the fan speed in the heat sink is too high—the laser temperature in the laser projection device drops. The red laser significantly increases its luminous efficiency at low temperatures, resulting in a reddish tint on the overall image, reducing image quality and impacting the user's viewing experience.

[0059] The embodiments of the present application provide a laser projection device, a heat dissipation method for the laser projection device, and a heat dissipation device, which can solve the problems in the above-mentioned related technologies.

[0060] Figure 1 1 is a schematic structural diagram of a laser projection device according to an embodiment of the present invention.

[0061] The laser projection device 10 includes a laser assembly 11 , a temperature detection assembly 12 , a processing assembly 13 and a heat sink 14 . The laser assembly 11 includes lasers of at least two colors, and the at least two colors of lasers include a red laser 111 .

[0062] The temperature detection component 12 is used to obtain the temperature of the red laser during operation.

[0063] The processing component 13 is configured to control the radiator 14 to dissipate heat from the red laser 111 so that the temperature of the red laser 111 is between a first temperature value and a second temperature value. The first temperature value is the highest temperature value at which the color ratio of the red laser light emitted by the red laser 111 in the image of the laser projection device deviates less than a specified value, and the second temperature value is the lowest temperature value at which the color ratio of the red laser light emitted by the red laser 111 in the image of the laser projection device deviates less than a specified value. The processing component 13 may include one or more central processing units, or may also include other control circuits, and this embodiment of the present application is not limited thereto.

[0064] In summary, the embodiments of the present application provide a laser projection device comprising a laser assembly, a temperature detection assembly, a processing assembly, and a heat sink. The temperature of the red laser during operation is obtained by the temperature detection assembly, and the temperature of the laser is regulated by the heat sink so that the temperature of the laser is maintained between a first temperature value and a second temperature value during operation. This can further reduce the degree of color cast of the laser during operation, thereby more comprehensively controlling the temperature of the laser projection device. This solves the problem in the related art that the heat dissipation methods of laser projection devices are not comprehensive enough, making it difficult to ensure the imaging effect of the laser projection device, and achieves the effect of effectively ensuring the imaging quality of the laser projection device.

[0065] A laser can emit laser light when powered on. However, the laser's photoelectric conversion efficiency is typically around 40%, with the remaining electrical energy converted to heat. This means the laser generates heat during operation. When this heat causes the laser temperature to become too high, it can prevent the laser from maintaining its specified luminous efficiency, leading to image display issues, such as color cast. The maximum temperature at which the laser's color cast is less than a specified value varies depending on the laser's specifications. The specific first temperature value can be obtained from the laser manufacturer or determined by the degree of color cast in the image.

[0066] Optionally, the processing component is used to: determine the pending temperature value; obtain the offset ratio of the color coordinates of the imaging screen of the laser projection device between the pending temperature value and the first temperature value; when the offset ratio is less than the target value, determine the pending temperature value as the second temperature value; when the offset ratio is not less than the target value, adjust the pending temperature value, and execute the step of obtaining the offset ratio of the color coordinates of the imaging screen of the laser projection device between the pending temperature value and the first temperature value.

[0067] The undetermined temperature value is the lowest temperature at which the color cast of the laser light emitted by the laser is less than the specified value. Currently, there is not much research on heat dissipation methods for full-color lasers. Typically, the method used for monochromatic lasers is used to lower the laser temperature below the specified maximum temperature. This results in the luminous efficiency of the red laser light of full-color lasers being improved at low temperatures, resulting in the overall hue of the image being reddish. Therefore, in the embodiments of the present application, after determining the highest temperature at which the color cast of the laser light emitted by the laser is less than the specified value, the lowest temperature at which the color cast of the laser light emitted by the laser is less than the specified value is also determined.

[0068] Since the degree of color cast determined by the naked eye is not accurate enough and the judgment criteria of each person are inconsistent, color coordinates are used as the basis for color and color deviation in the embodiments of the present application. Color coordinates are a coordinate diagram that quantitatively expresses color using physical methods. Color coordinates represent color through the numerical values ​​of the x-axis and y-axis. For example, the standard red color coordinates are (0.67, 0.33), the standard green color coordinates are (0.21, 0.71), and the standard blue color coordinates are (0.14, 0.08). The color coordinates of pure white light are (0.33, 0.33). Taking the color coordinate diagram of the imaging screen as an example, when the temperature of the laser is too high or too low, the color coordinates of the resulting imaging screen are offset compared to the color coordinates of the imaging screen generated under normal temperature conditions, that is, the numerical values ​​of the red color coordinates, green color coordinates, and blue color coordinates change. Therefore, the color cast degree of the imaging screen can be judged by the coordinate values ​​of the color coordinates.

[0069] In the embodiment of the present application, since the red laser is more sensitive to temperature changes in a full-color laser, when the temperature of the laser is too low, the luminous efficiency of the red laser will be greatly improved. Therefore, the change amplitude of the red light in the color coordinate is larger, and the color cast degree of the imaging image can be obtained more accurately.

[0070] Since the change of red light in the color coordinate is mainly reflected on the color coordinate x-axis, what is obtained in this application is the coordinate value of red on the color coordinate x-axis in the imaging picture.

[0071] Optionally, the processing component is further configured to determine, according to a preset formula, an offset ratio of the color coordinates of the imaging screen of the laser projection device between the to-be-determined temperature value and the first temperature value, wherein the preset formula includes:

[0072]

[0073] n is the offset rate, X2 is the coordinate value of red on the x-axis of the color coordinate in the imaging picture at the first temperature value, and X1 is the coordinate value of red on the x-axis of the color coordinate in the imaging picture at the undetermined temperature value.

[0074] The pending temperature value is the lowest temperature value at which the color cast of the laser light emitted by the laser is less than the specified value. However, this lowest temperature value may not be the most appropriate temperature value, so the pending temperature value can be verified using a preset formula. This pending temperature value is substituted into the above preset formula. If the value of the offset rate calculated on the left side of the formula is less than or equal to n, that is, less than or equal to the target value, the pending temperature value is determined as the second temperature value.

[0075] If the offset ratio calculated on the left side of the formula is greater than n, it indicates that the red light offset has exceeded the acceptable range and the overall color cast of the image is obvious. This indicates that the proposed temperature value is not the optimal one and needs to be adjusted. The target value can be 4%.

[0076] When the offset rate is less than the target value, it indicates that the offset degree of the red light is within an acceptable range and the overall color rendering of the imaging image is within a normal range. The undetermined temperature value can be determined as the second temperature value, which is the lowest temperature value at which the color cast of the laser light emitted by the laser is less than the specified value.

[0077] If the offset rate is not less than the target value, the pending temperature value can be adjusted. The adjusted pending temperature value is re-entered into the preset formula to determine the relationship between the offset rate and the target value again. The above steps can be repeated multiple times until the offset rate is less than the target value, and the pending temperature value is determined as the second temperature value.

[0078] Optionally, the radiator includes a heat sink and two fans located on both sides of the heat sink, and the processing component is further used to: determine a third temperature value between the first temperature value and the second temperature value; when the temperature of the laser is higher than the third temperature value, control the two fans to run simultaneously; when the temperature of the laser is lower than the third temperature value, control one of the two fans to run and the other fan to be turned off.

[0079] The laser can be cooled using a liquid cooling mode or an air cooling mode. The embodiment of the present application uses the air cooling mode as an example for description.

[0080] Figure 2 A schematic structural diagram of a radiator provided in the present application. The radiator 30 includes a heat sink 31 and two fans 32 and 33 located on both sides of the heat sink 31. The radiator may also include a heat pipe 34 and a heat plate 35. The heat pipe 34 and the heat plate 35 are used to transfer heat. Therefore, a material with good heat transfer performance can be selected. The heat pipe 34 and the heat plate 35 used in the embodiment of the present application are a heat-conducting copper pipe and a heat-conducting copper plate. The material of the heat pipe 34 and the heat plate 35 is not limited in the embodiment of the present application. One end of the heat-conducting copper plate is connected to the heat-conducting copper pipe, and the other end is connected to the heat sink 31. The two fans 32 and 33 on both sides of the heat sink 31 are arranged relative to each other, which can increase the heat dissipation capacity of the radiator. The heat sink 31 can be a heat dissipation aluminum sheet, or it can be made of other materials with higher heat dissipation effect, which is not limited in the embodiment of the present application. The heat-conducting copper plate absorbs and transfers the heat to the heat-conducting copper tube. The heat-conducting copper tube transfers the heat to the heat sink aluminum sheet through the phase change heat transfer principle. The forced convection of the two fans 32 and 33 arranged opposite to each other can dissipate the heat more quickly, thereby quickly reducing the temperature of the laser.

[0081] Optionally, the difference between the first temperature value and the third temperature value is less than the difference between the third temperature value and the second temperature value. The third temperature value is a value between the first temperature value and the second temperature value, and the third temperature value can be used as a temperature value to determine whether to adjust the current heat dissipation mode of the radiator.

[0082] It takes a process for the radiator to change the temperature of the laser. If the radiator is adjusted after the temperature of the laser exceeds the first temperature value and the second temperature value, the temperature of the laser will still be outside the temperature range that can maintain normal luminous efficiency for a period of time, that is, the displayed image will have serious color cast for a period of time, which will still reduce the user's viewing experience. The difference between the first temperature value and the third temperature value can also be greater than the difference between the third temperature value and the second temperature value, that is, the third temperature value can be any value between the first temperature value and the second temperature value. Therefore, the present application also sets a third temperature value between the first temperature value and the second temperature value, and the radiator can be controlled by whether the laser reaches the third temperature value.

[0083] The third temperature value is any value between the first and second temperature values ​​that is closer to the highest temperature value. When the laser temperature is higher than the third temperature value, the laser temperature is closer to the first temperature value, which means that the laser temperature is close to the highest temperature value. At this time, the two fans of the radiator are controlled to run simultaneously. The forced convection of the two fans can cool the laser more quickly.

[0084] Optionally, the fan has a first speed and a second speed, the first speed is less than the second speed, and the processing component is further used to: when the temperature of the laser is lower than a third temperature, turn off one of the two fans and control the other fan to run at the first speed; when the temperature of the laser is higher than the first temperature, control the two fans to run at the second speed.

[0085] The temperature of the laser is not only affected by its own thermal energy, but also by the ambient temperature. The heat sink in related technologies is usually a fan. When the ambient temperature is too low, the temperature of the laser is not enough to maintain between the first and second temperatures. However, if the heat sink is completely stopped, the heat generated by the laser during operation will cause the laser temperature to rise again. At this time, there is no heat sink to dissipate heat, and the image will show serious color cast.

[0086] The rotational speeds of the two fans in the embodiment of the present application can be set in advance. The fans have a first rotational speed and a second rotational speed. The first rotational speed is less than the second rotational speed. The first rotational speed can be the lowest rotational speed or a rotational speed lower than the second rotational speed. The second rotational speed is greater than the first rotational speed. The second rotational speed can be the highest rotational speed of the fan or a rotational speed higher than the first rotational speed. The specific second rotational speed can be adjusted according to the current temperature. When the temperature of the laser is lower than the third temperature, one of the two fans is turned off, so that the rotational speed of one of the two fans is 0, and the rotational speed of the other fan in the running state is adjusted to the first rotational speed of the fan; when the temperature of the laser is lower than the second temperature, that is, lower than the lowest temperature value at which the color cast of the laser light emitted by the laser is less than the specified value, one of the two fans is turned off, so that the rotational speed of one of the two fans is 0, and the rotational speed of the other fan in the running state is adjusted to the lowest rotational speed of the fan. At this time, the heat dissipation capacity of the radiator is relatively low, and the heat dissipation of the laser during operation can be slightly reduced to prevent the laser temperature from being too high and causing color cast.

[0087] When the temperature of the laser gradually rises to a third temperature, the fan that is turned off is turned on to run at the first speed, and the other fan continues to run.

[0088] When the ambient temperature is too high and the laser is continuously running, the laser temperature may exceed the maximum temperature value at which the color cast of the laser light emitted by the laser is less than the specified value, that is, higher than the first temperature. At this time, both fans in the radiator can be turned on and the wind speed can be adjusted to the second speed. The two oppositely arranged fans can quickly cool the radiator at a higher wind speed, so that the radiator is maintained between the first and second temperature values, thereby ensuring the quality of the imaging picture.

[0089] Figure 3 FIG. 1 is a schematic structural diagram of another laser projection device according to an embodiment of the present invention.

[0090] The laser projection device 60 includes a processing component (not shown), a laser 61, and a heat sink. The processing component is used to control the speed of the fan in the heat sink. The laser projection device 60 may also include an illumination system 62, an electronic card board 63, and a lens 64. The laser 61 is used to output laser light to the illumination system 62, which forms an image, and then outputs the image through the lens 64. The electronic card board 63 is used to provide driving force for other components in the laser projection device 60 and control the input and output of signals of the laser projection device 60.

[0091] Optionally, the heat sink includes a heat sink 31 and two fans 32 and 33 located on either side of the heat sink 31. The heat sink may also include a fan assembly, which may include at least two independent fans. Each independent fan may be located near various components of the laser projection device 60. The number and size of the fans in the fan assembly may vary depending on the size of the laser projection device 60. The fan assembly in the embodiment of the present application includes three fans 351, 352, and 353, which are located near the lighting system 62, the electronic card board 63, and the lens 64, respectively. The temperatures of the lighting system 62, the electronic card board 63, and the lens 64 are relatively stable and vary with the ambient temperature. Therefore, they can be continuously cooled by independent fans. The processing component may be located at a predetermined position in the laser projection device 60. The processing component may simultaneously control the two fans 32 and 33 and the fan assembly, or two processing components may be used to control the two fans 32 and 33 and the fan assembly separately. The control method and number of the processing components are not limited in this embodiment of the present application.

[0092] like Figure 3 As shown, the layout of the laser projection device 60 can be set as follows: two fans 32 and 33 connected to the heat sink 31 in the radiator are arranged opposite each other, the heat sink 31, the two fans 32 and 33 are adjacent to the laser 61, the heat conducting plate in the radiator can contact the laser 61 and transfer the heat of the laser 61 to the heat sink 31 through the heat pipe. The fan 351 is located on the other side of the laser 61 and can work together with the fans 32 and 33 to evenly dissipate heat from the laser 61. The fan 352 is located on one side of the electronic card board 63 and can cool the electronic card board 63. The fan 353 is arranged opposite to the fan 33 and can cool the lens 64 through convection wind. In the embodiment of the present application, the fan 32 is the air inlet, the fan 33 is the air outlet, and the wind direction is along the air path in the direction F. The air path of the radiator is not limited to the air path along the direction F, and can also be an air path perpendicular to the direction F.

[0093] In summary, the embodiments of the present application provide a laser projection device comprising a laser assembly, a temperature detection assembly, a processing assembly, and a heat sink. The temperature of the red laser during operation is obtained by the temperature detection assembly, and the temperature of the laser is regulated by the heat sink so that the temperature of the laser is maintained between a first temperature value and a second temperature value during operation. This can further reduce the degree of color cast of the laser during operation, thereby more comprehensively controlling the temperature of the laser projection device. This solves the problem in the related art that the heat dissipation methods of laser projection devices are not comprehensive enough, making it difficult to ensure the imaging effect of the laser projection device, and achieves the effect of effectively ensuring the imaging quality of the laser projection device.

[0094] Figure 4FIG. 1 is a flow chart of a heat dissipation method for a laser projection device according to an embodiment of the present invention, which is applicable to the laser projection device provided by any of the above embodiments. The method may include the following steps:

[0095] Step 401 : Acquire a first temperature value of a red laser during operation. The first temperature value is a maximum temperature value at which the deviation of the color ratio of the red laser emitted by the red laser in an image imaged by a laser projection device is less than a specified value.

[0096] Step 402 : Acquire a second temperature value when the red laser is in operation. The second temperature value is the lowest temperature value at which the deviation of the color ratio of the red laser emitted by the red laser in the image of the laser projection device is less than a specified value.

[0097] Step 403: Control the heat sink so that the temperature of the red laser is between the first temperature value and the second temperature value.

[0098] In summary, the embodiments of the present application provide a heat dissipation method for a laser projection device, which is used for a laser projection device including a laser assembly, a temperature detection assembly, a processing assembly, and a heat sink. The temperature of a red laser during operation is obtained by the temperature detection assembly, and the temperature of the laser is regulated by the heat sink so that the temperature of the laser is maintained between a first temperature value and a second temperature value during operation. This can further reduce the degree of color cast of the laser during operation, thereby more comprehensively controlling the temperature of the laser projection device. This method solves the problem in the related art that the heat dissipation method for laser projection devices is not comprehensive enough and it is difficult to ensure the imaging effect of the laser projection device, thereby achieving the effect of effectively ensuring the imaging quality of the laser projection device.

[0099] Figure 5 FIG. 1 is a flow chart of another heat dissipation method for a laser projection device according to an embodiment of the present invention. The method may include the following steps:

[0100] Step 501 : Acquire a first temperature value of a red laser during operation. The first temperature value is a maximum temperature value at which the deviation of the color ratio of the red laser emitted by the red laser in an image of a laser projection device is less than a specified value.

[0101] Step 502: Determine the temperature value to be determined.

[0102] Step 503: Obtain the offset ratio of the color coordinates of the imaging image of the laser projection device between the undetermined temperature value and the first temperature value.

[0103] The offset ratio of the color coordinates of the imaging screen of the laser projection device to the undetermined temperature value and the first temperature value is determined according to a preset formula, wherein the preset formula includes:

[0104]

[0105] n is the offset rate, X2 is the coordinate value of red on the x-axis of the color coordinate in the imaging picture at the first temperature value, and X1 is the coordinate value of red on the x-axis of the color coordinate in the imaging picture at the undetermined temperature value.

[0106] Step 504 , determine whether the offset rate is less than the target value. When the offset rate is less than the target value, execute step 505 ; when the offset rate is not less than the target value, execute step 506 .

[0107] Step 505 : Determine the undetermined temperature value as the second temperature value; and execute step 507 .

[0108] Step 506 : Adjust the temperature value to be determined, and execute step 503 .

[0109] Step 507: Control the heat sink so that the temperature of the red laser is between the first temperature value and the second temperature value.

[0110] In summary, the embodiments of the present application provide a heat dissipation method for a laser projection device, which is used for a laser projection device including a laser assembly, a temperature detection assembly, a processing assembly, and a heat sink. The temperature of a red laser during operation is obtained by the temperature detection assembly, and the temperature of the laser is regulated by the heat sink so that the temperature of the laser is maintained between a first temperature value and a second temperature value during operation. This can further reduce the degree of color cast of the laser during operation, thereby more comprehensively controlling the temperature of the laser projection device. This method solves the problem in the related art that the heat dissipation method for laser projection devices is not comprehensive enough and it is difficult to ensure the imaging effect of the laser projection device, thereby achieving the effect of effectively ensuring the imaging quality of the laser projection device.

[0111] Figure 6 FIG2 is a schematic diagram of a heat dissipation device for a laser projection device according to an embodiment of the present invention. The device is used in a laser projection device comprising a laser assembly and a heat sink. The laser assembly comprises at least two laser colors, wherein the at least two laser colors include a red laser. The heat dissipation device 20 of the laser projection device comprises:

[0112] The first temperature acquisition module 201 is used to acquire a first temperature value of the red laser during operation. The first temperature value is the highest temperature value at which the color ratio of the red laser emitted by the red laser in the image of the laser projection device deviates less than a specified value.

[0113] The second temperature acquisition module 202 is used to acquire a second temperature value when the red laser is running. The second temperature value is the lowest temperature value at which the deviation of the color ratio of the red laser emitted by the red laser in the imaging picture of the laser projection device is less than a specified value.

[0114] The control module 203 is configured to control the radiator so that the temperature of the red laser is between a first temperature value and a second temperature value.

[0115] In summary, the embodiments of the present application provide a heat dissipation device for a laser projection device, which is used in a laser projection device including a laser assembly, a temperature detection assembly, a processing assembly, and a heat sink. The temperature of the red laser during operation is obtained by the temperature detection assembly, and the temperature of the laser is regulated by the heat sink so that the temperature of the laser is maintained between a first temperature value and a second temperature value during operation. This can further reduce the degree of color cast of the laser during operation, thereby more comprehensively controlling the temperature of the laser projection device. This solves the problem in the related art that the heat dissipation method of the laser projection device is not comprehensive and it is difficult to ensure the imaging effect of the laser projection device, and achieves the effect of effectively ensuring the imaging quality of the laser projection device.

[0116] Will Figure 5 The heat dissipation method of the laser projection device shown is used for Figure 3 The laser projection device 60 shown in FIG was used to conduct an experiment, and the specific process was as follows:

[0117] When the ambient temperature is between 10°C and 40°C, the temperature of the laser can be maintained between 38°C and 45°C, that is, the first temperature is 45°C, the second temperature is 38°C, and the third temperature value is determined to be 43°C between the first and second temperatures. When the ambient temperature is 10°C, if the fan assembly and fans 32 and 33 are still running normally at the lowest speed, the temperature of the laser will drop below 38°C, reaching approximately 30°C, which is lower than the minimum temperature of 38°C for the laser to maintain normal luminous efficiency.

[0118] After using the heat dissipation method of the laser projection device provided in the embodiment of the present application, when the temperature of the laser is lower than 38°C, any one of the fans 32 and 33 is turned off and its speed is zero, the heat dissipation capacity of the radiator becomes weak, and the temperature of the laser rises to above 38°C. When the ambient temperature rises, the temperature of the laser rises accordingly. When the temperature of the laser is about to reach 43°C (the third temperature value), the fan that has stopped rotating is restarted so that the fan runs at the lowest speed. At this time, the heat dissipation capacity of the radiator is improved, and the temperature of the laser is reduced to above 38°C. When the ambient temperature continues to rise, all fans operate normally. When the temperature of the laser is higher than 45°C, the speed of fans 32 and 33 is increased, the heat dissipation capacity of the radiator is improved, and the temperature of the laser is reduced to below 45°C. Using the above heat dissipation method, the temperature of the laser is controlled between 38-45°C, the three-color lasers of the laser all maintain normal luminous efficiency, the imaging picture has normal color, the quality of the imaging picture and the user's viewing experience are improved, and the service life of the laser is extended.

[0119] The above descriptions are merely optional embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A laser projection device, characterized in that: The laser projection device includes a laser assembly, a temperature detection assembly, a processing assembly, and a heat sink. The laser assembly includes lasers of at least two colors, including a red laser. The heat sink includes a heat sink and two fans located on both sides of the heat sink. The fans have a first speed and a second speed, wherein the first speed is greater than the lowest speed of the fan and less than the second speed. The processing component is used to: obtain a first temperature value and a to-be-determined temperature value when the red laser is in operation, wherein the first temperature value is a maximum temperature value at which the deviation of the color ratio of the red laser light emitted by the red laser in the imaging picture of the laser projection device is less than a specified value; According to the preset formula , determining the offset ratio of the color coordinates of the imaging screen of the laser projection device between the pending temperature value and the first temperature value, wherein n is the offset ratio, X2 is the coordinate value of the red color in the imaging screen on the x-axis of the color coordinate when the first temperature value is used, and X1 is the coordinate value of the red color in the imaging screen on the x-axis of the color coordinate when the pending temperature value is used; when the offset ratio is less than a target value, determining the pending temperature value as a second temperature value, the second temperature value being the lowest temperature value at which the deviation of the color ratio of the red laser light emitted by the red laser in the imaging screen of the laser projection device is less than the specified value; when the offset ratio is not less than the target value, adjusting the pending temperature value, and executing the step of determining the offset ratio of the color coordinates of the imaging screen of the laser projection device between the pending temperature value and the first temperature value; determining a third temperature value between the first temperature value and the second temperature value; The temperature detection component is used to obtain the temperature of the red laser during operation; The processing component is used to control the radiator to dissipate heat for the red laser so that the temperature of the red laser is between the first temperature value and the second temperature value; wherein, when the temperature of the red laser is lower than the second temperature value, one of the two fans is controlled to operate at the minimum speed and the other fan is turned off; when the temperature of the red laser is greater than the second temperature value and lower than the third temperature value, one of the two fans is controlled to operate at the first speed and the other fan is turned off; when the temperature of the red laser is higher than the third temperature value, the two fans are controlled to operate at the first speed at the same time; and when the temperature of the red laser is higher than the first temperature value, the two fans are controlled to operate at the second speed at the same time.

2. The laser projection device according to claim 1, characterized in that: A difference between the first temperature value and the third temperature value is smaller than a difference between the third temperature value and the second temperature value.

3. A heat dissipation method for a laser projection device, characterized in that: For a laser projection device, the laser projection device includes a laser assembly and a heat sink, the laser assembly includes lasers of at least two colors, the lasers of at least two colors include a red laser, the heat sink includes a heat sink and two fans located on both sides of the heat sink, the fans have a first speed and a second speed, the first speed is greater than the lowest speed of the fan and less than the second speed; the method includes: Obtaining a first temperature value and a to-be-determined temperature value when the red laser is in operation, wherein the first temperature value is a maximum temperature value at which a degree of deviation of a color ratio of red laser light emitted by the red laser in an image of the laser projection device is less than a specified value; According to the preset formula , determining an offset ratio of the color coordinates of the imaging screen of the laser projection device between the undetermined temperature value and the first temperature value, wherein n is the offset ratio, X2 is the coordinate value of the red color in the imaging screen on the color coordinate x-axis when the temperature is the first temperature, and X1 is the coordinate value of the red color in the imaging screen on the color coordinate x-axis when the temperature is undetermined; When the offset rate is less than the target value, the undetermined temperature value is determined as a second temperature value, where the second temperature value is a minimum temperature value at which the deviation of the color ratio of the red laser light emitted by the red laser in the imaging picture of the laser projection device is less than the specified value; When the offset rate is not less than the target value, adjusting the undetermined temperature value, and performing the step of determining the offset rate of the color coordinates of the imaging screen of the laser projection device between the undetermined temperature value and the first temperature value; determining a third temperature value between the first temperature value and the second temperature value; The radiator is controlled to dissipate heat for the red laser so that the temperature of the red laser is between the first temperature value and the second temperature value; when the temperature of the red laser is lower than the second temperature value, one of the two fans is controlled to operate at the minimum speed and the other fan is turned off; when the temperature of the red laser is greater than the second temperature value and lower than the third temperature value, one of the two fans is controlled to operate at the first speed and the other fan is turned off; when the temperature of the red laser is higher than the third temperature value, the two fans are controlled to operate at the first speed at the same time; and when the temperature of the red laser is higher than the first temperature value, the two fans are controlled to operate at the second speed at the same time.

4. A heat dissipation device for laser projection equipment, characterized in that: For use in a laser projection device, the laser projection device includes a laser assembly and a heat sink, the laser assembly includes lasers of at least two colors, the lasers of at least two colors including a red laser, the heat sink includes a heat sink and two fans located on both sides of the heat sink, the fans have a first speed and a second speed, the first speed is greater than the lowest speed of the fan and less than the second speed; the device includes: a first temperature acquisition module, configured to acquire a first temperature value and a to-be-determined temperature value during operation of the red laser, wherein the first temperature value is a maximum temperature value at which a color ratio of the red laser light emitted by the red laser in an image of the laser projection device deviates less than a specified value; The second temperature acquisition module is used to obtain the temperature according to the preset formula , determining the offset ratio of the color coordinates of the imaging screen of the laser projection device between the pending temperature value and the first temperature value, wherein n is the offset ratio, X2 is the coordinate value of the red color in the imaging screen on the x-axis of the color coordinate when the first temperature value is used, and X1 is the coordinate value of the red color in the imaging screen on the x-axis of the color coordinate when the pending temperature value is used; when the offset ratio is less than a target value, determining the pending temperature value as a second temperature value, the second temperature value being the lowest temperature value at which the deviation of the color ratio of the red laser light emitted by the red laser in the imaging screen of the laser projection device is less than a specified value; when the offset ratio is not less than the target value, adjusting the pending temperature value, and executing the step of determining the offset ratio of the color coordinates of the imaging screen of the laser projection device between the pending temperature value and the first temperature value; A control module is configured to determine a third temperature value between the first temperature value and the second temperature value; control the radiator to dissipate heat for the red laser so that the temperature of the red laser is between the first temperature value and the second temperature value; wherein, when the temperature of the red laser is lower than the second temperature value, control one of the two fans to operate at the minimum speed and the other fan to be turned off; when the temperature of the red laser is greater than the second temperature value and lower than the third temperature value, control one of the two fans to operate at the first speed and the other fan to be turned off; when the temperature of the red laser is higher than the third temperature value, control the two fans to operate at the first speed simultaneously; and when the temperature of the red laser is higher than the first temperature value, control the two fans to operate at the second speed simultaneously.

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