CN113253559A - Laser projection equipment and laser projection system - Google Patents
Laser projection equipment and laser projection system Download PDFInfo
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- CN113253559A CN113253559A CN202110602333.1A CN202110602333A CN113253559A CN 113253559 A CN113253559 A CN 113253559A CN 202110602333 A CN202110602333 A CN 202110602333A CN 113253559 A CN113253559 A CN 113253559A
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- 239000003086 colorant Substances 0.000 claims abstract description 27
- 230000007423 decrease Effects 0.000 claims description 11
- 230000009467 reduction Effects 0.000 claims description 9
- 230000002596 correlated effect Effects 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims 2
- 230000005611 electricity Effects 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 238000001816 cooling Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- 230000017525 heat dissipation Effects 0.000 description 29
- 238000010586 diagram Methods 0.000 description 12
- 230000000875 corresponding effect Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 6
- 230000020169 heat generation Effects 0.000 description 5
- 238000005286 illumination Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/16—Cooling; Preventing overheating
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2013—Plural light sources
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/206—Control of light source other than position or intensity
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Projection Apparatus (AREA)
Abstract
The application discloses laser projection equipment and laser projection system belongs to laser projection technical field. The laser projection apparatus includes: the device comprises a shell, a first temperature sensor, lasers of at least two colors and a control unit. The method comprises the steps that a first temperature sensor is arranged outside a shell of the laser projection equipment to detect the ambient temperature of the environment where the laser projection equipment is located, and the control unit is used for adjusting the working current of at least one color laser in the laser projection equipment after the ambient temperature is determined to be out of a first threshold temperature range. For example, when the ambient temperature is too high, the operating current of at least one color laser in the laser projection device can be reduced, so as to reduce the heating value of the laser, and further reduce the operating temperature of the laser. Therefore, the heat generated by the laser is reduced, so that the working temperature of the laser can be reduced without increasing the rotating speed of a cooling fan in the laser projection equipment, and the working noise of the laser projection equipment is reduced.
Description
Technical Field
The application relates to the technical field of laser projection, in particular to laser projection equipment and a laser projection system.
Background
The laser projection system comprises a projection screen and a laser projection device, wherein the laser projection device can project pictures on the projection screen to realize the functions of video playing and the like.
The current laser projection device comprises: the projection device comprises a light source assembly, an optical-mechanical assembly and a projection lens, wherein the light source assembly is used for providing high-intensity laser illumination light beams for the optical-mechanical assembly; the optical-mechanical assembly is used for modulating the laser illumination light beam by an image signal to form a modulated light beam, and the modulated light beam formed after modulation by the optical-mechanical assembly enters the projection lens; the projection lens is used for projecting the modulated light beam onto a projection screen.
During operation of a laser projection device, the light source assembly generates a large amount of heat. In order to ensure the normal operation of the laser projection equipment, the heat generated by the light source component needs to be transferred to the external environment through the heat dissipation component.
In the related art, when the working temperature of the laser projection device is too high, the rotating speed of a fan in the heat dissipation assembly is high, so that the heat dissipation assembly can emit large noise, and further the working noise of the laser projection device is large.
Disclosure of Invention
The embodiment of the application provides laser projection equipment and a laser projection system. The problem of large working noise of laser projection equipment in the prior art can be solved, the technical scheme is as follows:
in one aspect, a laser projection apparatus is provided, comprising:
the laser device comprises a shell, a first temperature sensor, a control unit and at least two colors of lasers, wherein the first temperature sensor is positioned outside the shell and connected with the shell;
wherein the at least two colors of lasers and the first temperature sensor are both electrically connected to the control unit, the control unit being configured to: adjusting the working current of the laser of at least one color after determining that the ambient temperature detected by the first temperature sensor is outside a first threshold temperature range.
In another aspect, a laser projection system is provided, comprising:
projection screen, and above-mentioned laser projection equipment.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
the laser projection apparatus includes: the device comprises a shell, a first temperature sensor, lasers of at least two colors and a control unit. The method comprises the steps that a first temperature sensor is arranged outside a shell of the laser projection equipment to detect the ambient temperature of the environment where the laser projection equipment is located, and the control unit is used for adjusting the working current of at least one color laser in the laser projection equipment after the ambient temperature is determined to be out of a first threshold temperature range. The working temperature of the laser in the laser projection equipment is ensured, and the laser can be stabilized within a certain working temperature range. For example, when the ambient temperature is too high, the operating current of at least one color laser in the laser projection device can be reduced, so as to reduce the heating value of the laser, and further reduce the operating temperature of the laser. Therefore, the heat generated by the laser is reduced, the rotating speed of a cooling fan in the laser projection equipment is not required to be increased, the working temperature of the laser can be reduced, the working noise of the laser projection equipment is reduced, the light efficiency, the reliability and the service life of the laser can be improved, and the display effect of the picture projected by the laser projection equipment is better.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a block diagram of a laser projection apparatus according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of a laser projection apparatus provided in an embodiment of the present application;
FIG. 3 is a block diagram of another laser projection apparatus provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a first heat sink according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a second heat sink according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a laser projection system according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a block diagram of a laser projection apparatus according to an embodiment of the present disclosure. The laser projection apparatus 000 may include: a housing 100, a first temperature sensor 200, at least two colors of lasers 300, and a control unit 400.
The first temperature sensor 200 in the laser projection apparatus 000 is located outside the housing 100 and is connected to the housing 100. The at least two color lasers 300 and the control unit 400 in the laser projection apparatus 000 are both located in the housing 100, and the first temperature sensor 200 and the at least two color lasers 300 are both electrically connected to the control unit 400
In the present application, since the first temperature sensor 200 is located outside the casing 100, the first temperature sensor 200 can be used to detect the ambient temperature of the environment where the laser projection apparatus 000 is located. Also, the first temperature sensor 200 may also transmit the ambient temperature it detects to the control unit 400 in the laser projection apparatus 000.
The control unit 400 in the laser projection device 000 may be configured to: after determining that the ambient temperature detected by the first temperature sensor 200 is outside the first threshold temperature range, the operating current of the laser 300 of at least one color is adjusted. For example, the first threshold temperature range may be 25 degrees celsius to 35 degrees celsius. After determining that the ambient temperature detected by the first temperature sensor 200 is lower than the first threshold temperature range, the operating current of the laser 300 of at least one color may be adjusted to be high; upon determining that the ambient temperature detected by the first temperature sensor 200 is above the first threshold temperature range, the operating current of the laser 300 for at least one color may be adjusted down. The operating temperature of the laser 300 in the laser projection device 000 is guaranteed to be stable within a certain operating temperature range, for example, the operating temperature range is 25 degrees celsius to 45 degrees celsius.
In the related art, when the ambient temperature of the environment where the laser projection apparatus is located is too high, the heat dissipation capability of the heat dissipation assembly in the laser projection apparatus is reduced, and in this case, in order to transfer the heat generated by the light source assembly 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 can generate larger noise, and the working noise of the laser projection equipment is larger. Moreover, if the ambient temperature of the environment where the laser projection device is located is further increased, the effect of transferring the heat generated by the light source assembly to the external environment cannot be achieved only by increasing the rotating speed of the fan in the heat dissipation assembly, and the light efficiency, reliability and service life of the light source assembly are further affected.
In the present application, the first temperature sensor 200 is disposed outside the housing 100 of the laser projection apparatus 000 to detect the ambient temperature of the environment where the laser projection apparatus 000 is located, and the control unit 400 is configured to reduce the operating current of the laser 300 of at least one color in the laser projection apparatus 000 after determining that the ambient temperature is higher than the first threshold temperature range, so as to reduce the heat generation amount of the laser 300, and further reduce the operating temperature of the laser 300. Thus, since the amount of heat generated by the laser 300 is reduced, the operating temperature of the laser 300 can be reduced without increasing the rotation speed of the cooling fan in the laser projection device 000, so as to reduce the operating noise of the laser projection device 000, and the light efficiency, reliability and lifetime of the laser 300 can be improved, so that the display effect of the picture projected by the laser projection device 000 is better.
To sum up, the laser projection apparatus provided in the embodiment of the present application includes: the device comprises a shell, a first temperature sensor, lasers of at least two colors and a control unit. The method comprises the steps that a first temperature sensor is arranged outside a shell of the laser projection equipment to detect the ambient temperature of the environment where the laser projection equipment is located, and the control unit is used for adjusting the working current of at least one color laser in the laser projection equipment after the ambient temperature is determined to be out of a first threshold temperature range. The working temperature of the laser in the laser projection equipment is ensured, and the laser can be stabilized within a certain working temperature range. For example, when the ambient temperature is too high, the operating current of at least one color laser in the laser projection device can be reduced, so as to reduce the heating value of the laser, and further reduce the operating temperature of the laser. Therefore, the heat generated by the laser is reduced, the rotating speed of a cooling fan in the laser projection equipment is not required to be increased, the working temperature of the laser can be reduced, the working noise of the laser projection equipment is reduced, the light efficiency, the reliability and the service life of the laser can be improved, and the display effect of the picture projected by the laser projection equipment is better.
In the embodiment of the present application, after determining that the ambient temperature is higher than the first threshold temperature range, the operating current of the laser 300 of at least one color is adjusted to be low, so as to reduce the heat generation amount of the laser 300, there are many possible implementation manners, and the embodiment of the present application is schematically illustrated by taking the following two possible implementation manners as examples:
in a first possible implementation, the control unit 400 may be configured to: after determining that the ambient temperature detected by the first temperature sensor 200 is higher than the first threshold temperature range, the operating current of the laser 300 of at least one color is adjusted down by a fixed value. In this manner, when the ambient temperature in which the laser projection apparatus 000 is located is high, the amount of heat generated by the laser 300 can be reduced by lowering the operating current of the laser 300 of at least one color by a fixed value.
In a second possible implementation, the control unit 400 may be configured to: after determining that the ambient temperature detected by the first temperature sensor 200 is higher than the first threshold temperature range, the operating current of the laser 300 of at least one color is adjusted to be lower based on the ambient temperature detected by the first temperature sensor 200, and the reduction amount of the operating current of the laser 300 of at least one color is positively correlated with the ambient temperature, that is, the higher the ambient temperature is, the larger the reduction amount of the operating current of the laser 300 of at least one color is.
In the present application, a first correspondence relationship between the operating current of the laser 300 of at least one color and the heat generation amount of the laser 300 of at least one color, and a second correspondence relationship between the heat generation amount of the laser 300 of at least one color and the ambient temperature may be experimentally determined in advance, and the first correspondence relationship and the second correspondence relationship may be stored in a designated storage address in the control unit 400. In this way, the control unit 400 may determine the heating value of the laser 300 of at least one color to be reduced based on the ambient temperature detected by the first temperature sensor according to the stored second corresponding relationship, and then determine the reduction amount of the operating current of the laser 300 of at least one color according to the stored first corresponding relationship.
Optionally, the control unit 400 may be further configured to: the operating current of each color of laser 300 is adjusted down based on the ambient temperature. The ratio of the decrease amount of the operating current of the laser 300 of each color to the total decrease amount of the current corresponds to the ratio of the light emitted by the laser 300 to the light emitted by the laser 300 of at least two colors, and the total decrease amount of the current is the sum of the decrease amounts of the currents of the lasers 300 of the colors of at least two colors. In this way, it can be ensured that the white balance of the picture projected by the laser projection apparatus 000 onto the projection screen is not disrupted after the operating currents of the lasers 300 of at least two colors are turned down.
For example, the ratio of the decrease in the operating current of the laser 300 of each color to the total decrease in current may be equal to the ratio of the light emitted by the laser 300 to the light emitted by the laser 300 of at least two colors as a whole.
In the embodiment of the present application, after determining that the ambient temperature is lower than the first threshold temperature range, the operating current of the laser 300 of at least one color is increased, so as to increase the heat generation amount of the laser 300, there are many possible implementation manners, and the embodiment of the present application is schematically illustrated by taking the following two possible implementation manners as examples:
in a first possible implementation, the control unit 400 may be configured to: after determining that the ambient temperature detected by the first temperature sensor 200 is lower than the first threshold temperature range, the operating current of the laser 300 of at least one color is adjusted higher by a fixed value. In this way, when the ambient temperature in which the laser projection apparatus 000 is located is low, the amount of heat generated by the laser 300 can be increased by adjusting the operating current of the laser 300 of at least one color higher by a fixed value.
In a second possible implementation, the control unit 400 may be configured to: after determining that the ambient temperature detected by the first temperature sensor 200 is lower than the first threshold temperature range, the operating current of the laser 300 of at least one color is adjusted to be high based on the ambient temperature detected by the first temperature sensor 200, and the adjustment amount of the operating current of the laser 300 of at least one color is inversely related to the ambient temperature, that is, the lower the ambient temperature is, the higher the adjustment amount of the operating current of the laser 300 of at least one color is.
Optionally, the control unit 400 may be further configured to: the operating current of each color of laser 300 is adjusted up based on the ambient temperature. The total current reduction amount is the sum of the current increase amounts of the lasers 300 of the respective colors, among the lasers 300 of the at least two colors, corresponding to the ratio of the operating current increase amount of the laser 300 of each color to the total current increase amount of the lasers 300 of the at least two colors. In this way, it can be ensured that the white balance of the picture projected by the laser projection apparatus 000 onto the projection screen is not disrupted after the operating currents of the lasers 300 of at least two colors are adjusted high.
For example, the duty ratio of the adjustment amount of the operating current of the laser 300 of each color to the total adjustment amount of the current may be equal to the duty ratio of the light emitted from the laser 300 to the light emitted from the laser 300 of at least two colors as a whole.
It should be noted that, in order to ensure the display effect of the laser projection apparatus 000, the adjustment amount (e.g., the reduction amount or the adjustment amount) of the operating current of the laser 300 of at least one color is generally smaller. However, when the ambient temperature is higher, the reduction amount of the operating current of the laser 300 of at least one color can be increased correspondingly; when the ambient temperature is low, the amount of increase in the operating current of the laser 300 of at least one color may be increased accordingly to protect the laser projection device 000.
It should be noted that, in order to ensure that the laser 300 is in a normal operating state, the operating current of the laser 300 of each color must not be lower than the minimum operating current and not higher than the maximum operating current when the operating current of the laser 300 is adjusted.
In this application, the control unit 400 may be further configured to: after determining that the ambient temperature detected by the first temperature sensor 200 is higher than the third threshold temperature, the lasers 300 of at least two colors are turned off. For example, the third threshold temperature may be 40 degrees celsius. Thus, the laser 300 in the laser projection device 000 can be prevented from operating in a high temperature environment which is not beneficial to heat dissipation for a long time, so that the laser 300 is protected, and the light efficiency, reliability and service life of the laser 300 are further improved.
In the embodiment of the present application, please refer to fig. 2, and fig. 2 is a schematic structural diagram of a laser projection apparatus provided in the embodiment of the present application. The housing 100 has an air inlet (not shown), and the first temperature sensor 200 is located at the air inlet of the housing 100. As such, the first temperature sensor 200 may detect the temperature of the airflow entering the laser projection device 000. Since the airflow entering the laser projection apparatus 000 is the airflow in the environment where the laser projection apparatus 000 is located, the first temperature sensor 200 can detect the temperature of the airflow in the environment where the laser projection apparatus 000 is located, so as to improve the accuracy of the temperature of the environment of the laser projection apparatus 000 detected by the first temperature sensor 200.
In this embodiment of the present application, as shown in fig. 3, fig. 3 is a block diagram of another structure of a laser projection apparatus provided in this embodiment of the present application, and the laser projection apparatus 000 may further include: a light source module having lasers 300 of at least two colors. When the light source module has two color lasers 300, the two color lasers may be: a blue laser and a red laser. The light source assembly may further include: fluorescent wheel and color filter wheel, etc. After the blue laser emits blue light, green light is generated through the fluorescent wheel, and then the blue light, the green light and red light emitted by the red laser can be transmitted to the optical-mechanical component after passing through the color filter wheel.
When the light source module has lasers of three colors, the lasers of the three colors may be: a blue laser, a red laser, and a green laser. The blue light emitted by the blue laser, the red light emitted by the red laser and the green light emitted by the green laser are transmitted to the opto-mechanical assembly.
In this application, as shown in fig. 2 and 3, the housing 100 further has a first air outlet, and the laser projection apparatus 000 may further include: a first fan 500 positioned at the air inlet, a first heat sink 600 contacting the light source assembly and positioned at the first air outlet in the housing 100, and a second temperature sensor 700 positioned between the housing 100 and the light source assembly. Wherein the air outlet surface of the first fan 500 faces the light source assembly, the first fan 300 and the second temperature sensor are both electrically connected to the control unit 400, and the control unit 400 in the laser projection apparatus 000 may be further configured to: after determining that the current operating temperature of the light source assembly detected by the second temperature sensor 700 is within the second threshold temperature range, the first fan 500 is controlled to blow air to the air inlet. For example, the second threshold temperature range may be 45 degrees celsius to 50 degrees celsius. In this way, after the second temperature sensor 700 detects that the current operating temperature of the light source assembly is within the second threshold temperature range, the laser projection apparatus 000 may control the first fan 500 to blow air through the control unit 400, and the air blown by the first fan 500 may enter the casing 100 from the air inlet of the casing 100 and be discharged from the first air outlet of the casing 100. The working temperature of the light source assembly inside the housing 100 is effectively reduced, and thus the working temperature of the light source assembly is lower. In addition, the light efficiency, reliability and life of the light source assembly can be effectively improved, so that the display effect of the picture projected by the laser projection equipment 000 is better.
In the present application, the first fan 500 may include: a fan body (not shown) and a fan motor (not shown). The fan motor in the first fan 500 has a driving shaft, the driving shaft in the fan motor may be connected to the fan body in the first fan 500, and the fan motor in the first fan 500 may be electrically connected to the control unit 400 in the laser projection apparatus 000. Thus, after determining that the current working temperature of the light source assembly is within the second threshold temperature range, the control unit 400 in the laser projection 000 may control the driving shaft of the fan motor in the first fan 500 to rotate so as to drive the fan body in the first fan 500 to rotate, so that the rotating fan body may blow air towards the air inlet of the casing 100, and the air blown by the first fan 500 may enter the casing 100 from the air inlet of the casing 100 and be discharged from the first air outlet of the casing 100, so as to reduce the working temperature of the light source assembly.
Optionally, as shown in fig. 4, fig. 4 is a schematic structural diagram of a first heat sink provided in an embodiment of the present application. The first heat sink 600 may include: a first heat conduction block 601, a heat conduction pipe 602 and a first heat dissipation fin 603. The first heat conduction block 601 is in contact with one side of the light source module, one end of the heat conduction pipe 602 is connected to the first heat conduction block 601, and the other end is connected to the first heat dissipation fin 603. In this way, the heat generated by the light source assembly can be transferred to the heat conducting pipe 602 through the first heat conducting block 601, and can be quickly transferred to the external environment of the laser projection apparatus 000 through the heat conducting pipe 602 and the first heat dissipating fin 603 through the first air outlet in the housing 100, so that the heat transfer efficiency of the first heat sink 600 is improved.
In the embodiment of the present application, as shown in fig. 2 and 3, the laser projection apparatus 000 may further include: the second fan 800 is located on a side of the first heat sink 600 facing the first air outlet of the casing 100, the second fan 800 is connected to the control unit 400, and an air outlet surface of the second fan 800 faces the first air outlet of the casing 100. The control unit 400 in the laser projection device 000 may be further configured to: after determining that the current working temperature of the light source assembly is within the second threshold temperature range, the second fan 800 is controlled to blow air to the first air outlet of the housing 100. Thus, after the second temperature sensor 700 detects that the current working temperature of the light source assembly is within the second threshold temperature range, the laser projection apparatus 000 may control the second fan 800 to blow air through the control unit 400, so as to rapidly transfer the heat generated by the light source assembly to the external environment, thereby improving the heat dissipation efficiency of the first heat sink 600.
As an example, the second fan 800 may include: a fan body (not shown) and a fan motor (not shown). The fan body of the second fan 800 may be coupled with the first heat dissipation fins 603 of the first heat sink 600. The fan motor in the second fan 800 has a driving shaft, the driving shaft in the fan motor may be connected to the fan body in the second fan 800, and the fan motor in the second fan 800 may be electrically connected to the control unit 400 in the laser projection apparatus 000. Thus, after determining that the current working temperature of the light source assembly is within the second threshold temperature range, the control unit 400 in the laser projection 000 may control the driving shaft of the fan motor in the second fan 800 to rotate so as to drive the fan body in the second fan 800 to rotate, so that the rotating fan body may blow air towards the first air outlet of the casing 100, and thus the heat transferred from the light source assembly to the first heat dissipating fins 603 is quickly transferred to the external environment through the first air outlet in the casing 100, so as to improve the heat dissipating efficiency of the first heat sink 600.
Optionally, the number of the second fan 800 may be two, or in other alternative implementations, the number of the second fan 800 may also be multiple.
In this application, the control unit 400 in the laser projection apparatus 000 may be further configured to: based on the current operating temperature of the light source assembly, the rotational speeds of the first fan 500 and the second fan 800 are adjusted to reduce the current operating temperature of the light source assembly below the second threshold temperature range. Wherein, the rotation speed of the first fan 500 and the rotation speed of the second fan 800 are both in positive correlation with the current working temperature of the light source assembly.
For example, when the control unit 400 determines that the current operating temperature of the light source assembly is high, the control unit 400 may increase the rotation speed of the first fan 500 and the rotation speed of the second fan 800 to increase the air volume entering the air inlet of the casing 100 and the heat dissipation efficiency of the first heat sink 600, so that the current operating temperature of the light source assembly can be rapidly reduced below the second threshold temperature range. When it is determined that the current operating temperature of the light source assembly is relatively low, the control unit 400 may decrease the rotation speed of the first fan 500 and the rotation speed of the second fan 800 to reduce the air volume entering the air inlet of the casing 100 and the heat dissipation efficiency of the first heat sink 600, so as to reduce the noise generated by the first fan 500 and the second fan 800, and further reduce the operating noise of the laser projection apparatus 000.
In other alternative implementations, the correspondence between the rotation speeds of the first fan 500 and the second fan 800 and the current operating temperature of the light source assembly may be predetermined, so that after the control unit 400 determines the current operating temperature of the light source assembly, the first fan 500 and the second fan 800 may be controlled to rotate at the corresponding rotation speeds based on the correspondence, so that the first fan 500 and the second fan 800 can adjust the current operating temperature of the light source assembly to be below the second threshold temperature range more quickly.
In this application, the control unit 400 may be further configured to: after determining that the ambient temperature detected by the second temperature sensor 700 is above the second threshold temperature range, the lasers 300 of at least two colors are turned off. In this way, the situation that the working temperature of the laser 300 in the laser projection device 000 is high for a long time can be avoided, so that the laser 300 is protected, and the light efficiency, reliability and service life of the laser 300 are further improved.
In an embodiment, as shown in fig. 2, the laser projection apparatus 000 may further include: the optical engine assembly 900. The opto-mechanical assembly 900 may include: a dodging component (not shown), a Digital Micromirror Device (DMD) light valve 901, a TIR prism (not shown), and a galvanometer (not shown). The dodging assembly in the optical-mechanical assembly is used for processing the light beam input into the optical-mechanical assembly into an illumination light beam. The light homogenizing assembly is located between the light source assembly and the optical engine assembly 900, red light, green light and blue light emitted from the light source assembly enter the light homogenizing assembly firstly, and then the red light, the green light and the blue light are guided into the optical engine assembly 900 by the light homogenizing assembly. The DMD light valve 901 in the optical engine assembly 900 is used for modulating the image signal of the illumination beam provided by the dodging assembly to form a modulated beam. The TIR prism in the optical engine assembly 900 is used to reflect the modulated beam to the galvanometer. The galvanometer in the optical-mechanical assembly is driven by an electromagnetic driver to swing, and modulated light beams passing through the galvanometer sequentially enter the projection lens in a staggered mode.
In this application, the DMD light valve 901 will also generate some heat when the laser projection device 000 is in operation. As shown in fig. 2 and 3, the housing 100 has a second air outlet disposed opposite to the first air outlet. The laser projection apparatus 000 may further include: a second heat sink 1000 for dissipating heat of the DMD light valve 901, and a third fan 1100 located at a side of the second heat sink 1000 close to the air inlet of the housing 100. The air outlet surface of the third fan 1100 faces the DMD light valve 901, and the third fan 1100 is electrically connected to the control unit 400. The control unit 400 may be further configured to: after determining that the current operating temperature of the light source assembly detected by the second temperature sensor 700 is within the second threshold temperature range, the third fan 1100 is controlled to blow air to the DMD light valve 901. In this way, after the second temperature sensor 700 detects that the current operating temperature of the light source assembly is within the second threshold temperature range, the laser projection apparatus 000 may control the third fan 1100 to blow air through the control unit 400, and the third fan 1100 may blow a part of the air entering the casing 100 from the air inlet of the casing 100 to the DMD light valve 901 and discharge the air from the second air outlet of the casing 100. The heat generated by the DMD light valve 901 may be transferred to the external environment through the second heat sink 1000 and the third fan 1100, so as to effectively reduce the operating temperature of the DMD light valve 901 located inside the casing 100, and further, the operating temperature of the DMD light valve 901 is low, which may effectively improve the reliability and the lifetime of the DMD light valve 901, and make the display effect of the image projected by the laser projection device 000 be good.
Optionally, as shown in fig. 5, fig. 5 is a schematic structural diagram of a second heat sink provided in the embodiment of the present application. The second heat sink 1000 may include: a second heat conduction block 1001 and a second heat radiation fin 1002. One surface of the heat conducting block 1001 is in contact with one side of the DMD light valve 901, and the other surface of the heat conducting block 1001 is connected to two heat dissipating fins 1002. In this way, the heat generated by the DMD light valve 901 may be transferred to the second heat dissipation fins 1002 through the second heat conduction block 1001, which improves the heat transfer efficiency of the second heat sink 1000.
As an example, the third fan 1100 may include: a fan body (not shown) and a fan motor (not shown). The fan body of the third fan 1100 may be connected to the second heat dissipation fins 1002 of the second heat sink 1000. The fan motor in the third fan 1100 has a driving shaft, the driving shaft in the fan motor may be connected to the fan body in the third fan 1100, and the fan motor in the third fan 1100 may be electrically connected to the control unit 400 in the laser projection apparatus 000. Thus, after determining that the current working temperature of the light source assembly is within the second threshold temperature range, the control unit 400 in the laser projection 000 may 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 may blow air through the DMD light valve 901, and thus the heat transferred from the DMD light valve 901 to the second heat dissipation fins 1002 is quickly transferred to the external environment through the second air openings 103 in the housing 100, so as to improve the heat dissipation efficiency of the second heat sink 1000.
In this application, the control unit 400 in the laser projection apparatus 000 may be further configured to: the base may be further configured to: based on the current operating temperature of the light source assembly, the rotation speed of the third fan 1100 is adjusted to reduce the current operating temperature of the DMD light valve 901 below the second threshold temperature range. Wherein, the rotation speed of the third fan 1100 is positively correlated with the current working temperature of the light source assembly.
For example, when the control unit 400 determines that the current operating temperature of the light source assembly is high, the control unit 400 may increase the rotation speed of the third fan 1100 to improve the heat dissipation efficiency of the second heat sink 1000, so that the operating temperature of the DMD light valve 901 can be rapidly reduced to be below the second threshold temperature range. When it is determined that the current operating temperature of the light source assembly is low, the control unit 400 may decrease the rotation speed of the third fan 1100 to reduce the heat dissipation efficiency of the second heat sink 1000, so as to reduce the noise generated by the third fan 1100, and further reduce the operating noise of the laser projection apparatus 000.
In other alternative implementations, a corresponding relationship between the rotation speed of the third fan 1100 and the current operating temperature of the light source assembly may be predetermined, so that after the control unit 400 determines the current operating temperature of the light source assembly, the third fan 1100 may be controlled to rotate at a corresponding rotation speed based on the corresponding relationship, so that the third fan 1100 can adjust the current operating temperature of the DMD light valve 901 to be below the second threshold temperature range more quickly.
In the embodiment of the present application, as shown in fig. 2, the laser projection apparatus 000 may further include: the electronic board 1200. The control unit 400 may be integrated in the electronic board 1200. In a possible implementation, the electronic board 1200 is disposed parallel to the bottom of the housing, which is beneficial to heat dissipation of the electronic board 1200.
In the present application, as shown in fig. 2 and 3, the laser projection apparatus 000 may further include: and a fourth fan 1300 at the second air outlet of the casing 100. The air outlet surface of the fourth fan 1300 faces the second air outlet of the housing 100, and the fourth fan 1300 is electrically connected to the control unit 400. The control unit 400 may be further configured to: after determining that the current operating temperature of the light source assembly detected by the second temperature sensor 700 is within the second threshold temperature range, the fourth fan 1300 is controlled to blow air. Thus, after the second temperature sensor 700 detects that the current working temperature of the light source assembly is within the second threshold temperature range, the laser projection apparatus 000 may control the fourth fan 1300 to blow air through the control unit 400, so as to quickly transfer heat generated by the DMD light valve 901 to the external environment, thereby improving the heat dissipation efficiency of the second heat sink 1000.
For example, the fourth fan 1300 may include: a fan body (not shown) and a fan motor (not shown). The fan motor in the fourth fan 1300 has a driving shaft, the driving shaft in the fan motor may be connected to the fan body in the fourth fan 1300, and the fan motor in the fourth fan 1300 may be electrically connected to the control unit 400 in the laser projection apparatus 000. Thus, after determining that the current working temperature of the light source assembly is within the second threshold temperature range, the control unit 400 in the laser projection 000 may 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 at the second air outlet of the casing 100, and thus heat generated by the DMD light valve 901 is quickly transferred to the external environment through the second air inlet 103 in the casing 100, so as to improve the heat dissipation efficiency of the second heat sink 1000.
In this application, the control unit 400 in the laser projection apparatus 000 may be further configured to: the base may be further configured to: based on the current operating temperature of the light source assembly, the rotation speed of the fourth fan 1300 is adjusted to reduce the current operating temperature of the DMD light valve 901 below the second threshold temperature range. Wherein, the rotation speed of the fourth fan 1300 is positively correlated to the current working temperature of the light source assembly.
For example, when the control unit 400 determines that the current operating temperature of the light source module is high, the control unit 400 may increase the rotation speed of the fourth fan 1300 to increase the heat dissipation efficiency into the second heat sink 1000, so that the current operating temperature of the DMD light valve 901 can be rapidly reduced below the second threshold temperature range. When it is determined that the current operating temperature of the light source module is lower, the control unit 400 may decrease the rotation speed of the fourth fan 1300 to reduce the heat dissipation efficiency of the second heat sink 1000, so as to reduce the noise generated by the fourth fan 1300, and further reduce the operating noise of the laser projection apparatus 000.
In other alternative implementations, a corresponding relationship between the rotation speed of the fourth fan 1300 and the current operating temperature of the light source assembly may be predetermined, so that after the control unit 400 determines the current operating temperature of the light source assembly, the fourth fan 1300 may be controlled to rotate at a corresponding rotation speed based on the corresponding relationship, so that the fourth fan 1300 can adjust the current operating temperature of the DMD light valve 901 to be below the second threshold temperature range more quickly.
Optionally, the number of the fourth fan 1300 may be two, or in other optional implementations, the number of the fourth fan 1300 may also be multiple.
In the embodiment of the present application, as shown in fig. 2, the laser projection apparatus 000 may further include: a projection lens 1400 positioned in the housing 100, and a heat insulation plate 1500 positioned between the projection lens 1400 and the light source assembly. Thus, the heat insulation board 1500 can prevent the heat generated by the light source assembly from being transferred to the projection lens 1400, thereby reducing the probability of deformation of the optical lens in the projection lens 1400 due to heating, and improving the display effect of the image projected by the laser projection device 000.
To sum up, the laser projection apparatus provided in the embodiment of the present application includes: the device comprises a shell, a first temperature sensor, lasers of at least two colors and a control unit. The method comprises the steps that a first temperature sensor is arranged outside a shell of the laser projection equipment to detect the ambient temperature of the environment where the laser projection equipment is located, and the control unit is used for adjusting the working current of at least one color laser in the laser projection equipment after the ambient temperature is determined to be out of a first threshold temperature range. The working temperature of the laser in the laser projection equipment is ensured, and the laser can be stabilized within a certain working temperature range. For example, when the ambient temperature is too high, the operating current of at least one color laser in the laser projection device can be reduced, so as to reduce the heating value of the laser, and further reduce the operating temperature of the laser. Therefore, the heat generated by the laser is reduced, the rotating speed of a cooling fan in the laser projection equipment is not required to be increased, the working temperature of the laser can be reduced, the working noise of the laser projection equipment is reduced, the light efficiency, the reliability and the service life of the laser can be improved, and the display effect of the picture projected by the laser projection equipment is better.
The embodiment of the application also provides a laser projection system, and the laser projection system can be an ultra-short-focus laser projection system. For example, as shown in fig. 6, fig. 6 is a schematic structural diagram of a laser projection system provided in an embodiment of the present application. The laser projection system may include: a projection screen 001 and a laser projection device 000. The laser projection apparatus 000 may be the laser projection apparatus in the above-described embodiment.
When the laser projection apparatus 000 is in operation, the laser projection apparatus 000 may emit light obliquely upward, so that the laser projection apparatus 000 may project a picture to the projection screen 001.
In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.
The above description is intended to be exemplary only, and not to limit the present application, and any modifications, equivalents, improvements, etc. made within the spirit and scope of the present application are intended to be included therein.
Claims (10)
1. A laser projection device, comprising:
the laser device comprises a shell, a first temperature sensor, a control unit and at least two colors of lasers, wherein the first temperature sensor is positioned outside the shell and connected with the shell;
wherein the at least two colors of lasers and the first temperature sensor are both electrically connected to the control unit, the control unit being configured to: adjusting the working current of the laser of at least one color after determining that the ambient temperature detected by the first temperature sensor is outside a first threshold temperature range.
2. A laser projection device as claimed in claim 1,
the control unit is configured to: after determining that the ambient temperature is higher than the first threshold temperature range, based on the ambient temperature, the operating current of the laser of the at least one color is adjusted to be low, and the reduction amount of the operating current of the laser of the at least one color is positively correlated with the ambient temperature.
3. A laser projection device as claimed in claim 2,
the control unit is configured to: based on the ambient temperature, the working current of the laser of each color is adjusted to be low; the ratio of the reduction of the working current of the laser of each color to the total reduction of the current corresponds to the ratio of the light emitted by the laser to the light emitted by the laser of the at least two colors; the total decrease in current is a sum of decreases in current for each of the at least two colored lasers.
4. A laser projection device as claimed in claim 1,
the control unit is configured to: after determining that the ambient temperature is lower than the first threshold temperature range, the operating current of the laser of at least one color is adjusted to be high based on the ambient temperature, and the adjustment amount of the operating current of the laser of at least one color is in negative correlation with the ambient temperature.
5. A laser projection device as claimed in claim 4,
the control unit is configured to: based on the ambient temperature, the working current of the laser of each color is increased; wherein, the ratio of the working current of the laser of each color to the total current adjustment amount corresponds to the ratio of the light emitted by the laser to the light emitted by the laser of the at least two colors; the total current adjustment amount is a sum of current adjustment amounts of the respective color lasers of the at least two color lasers.
6. A laser projection device as claimed in any one of claims 1 to 5,
the shell is provided with an air inlet, and the first temperature sensor is located at the air inlet of the shell.
7. A laser projection device as claimed in claim 6,
the casing still has first air outlet, laser projection equipment still includes: the light source assembly is provided with the lasers with at least two colors, a first fan is arranged at the air inlet, a first radiator is in contact with the light source assembly and is arranged at the first air outlet, and a second temperature sensor is arranged between the shell and the light source assembly;
wherein, the air-out face of first fan is towards the light source subassembly, first fan and the second temperature sensor all with the control unit electricity is connected, the control unit is still configured to: and after the current working temperature of the light source assembly detected by the second temperature sensor is determined to be within a second threshold temperature range, controlling the first fan to blow air to the air inlet.
8. A laser projection device as claimed in claim 7,
the laser projection apparatus further includes: the second fan is positioned on one side of the first radiator, which faces the first air outlet, is connected with the control unit, and the air outlet surface of the second fan faces the first air outlet;
the control unit is further configured to: and after the current working temperature of the light source assembly is determined to be within the second threshold temperature range, controlling the second fan to blow air to the first air outlet.
9. A laser projection device as claimed in claim 8,
the control unit is further configured to: adjusting the rotation speeds of the first fan and the second fan based on the current working temperature of the light source assembly to reduce the current working temperature of the light source assembly below the second threshold temperature range;
wherein the rotation speed of the first fan and the rotation speed of the second fan are positively correlated with the working temperature.
10. A laser projection system, comprising:
a projection screen, and a laser projection device as claimed in any one of claims 1 to 9.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110602333.1A CN113253559A (en) | 2021-05-31 | 2021-05-31 | Laser projection equipment and laser projection system |
| PCT/CN2022/096487 WO2022253246A1 (en) | 2021-05-31 | 2022-05-31 | Laser projection device and control method thereof |
| CN202280037927.5A CN117377907A (en) | 2021-05-31 | 2022-05-31 | Laser projection apparatus and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110602333.1A CN113253559A (en) | 2021-05-31 | 2021-05-31 | Laser projection equipment and laser projection system |
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| CN113253559A true CN113253559A (en) | 2021-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110602333.1A Pending CN113253559A (en) | 2021-05-31 | 2021-05-31 | Laser projection equipment and laser projection system |
| CN202280037927.5A Pending CN117377907A (en) | 2021-05-31 | 2022-05-31 | Laser projection apparatus and control method thereof |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202280037927.5A Pending CN117377907A (en) | 2021-05-31 | 2022-05-31 | Laser projection apparatus and control method thereof |
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| WO (1) | WO2022253246A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022253246A1 (en) * | 2021-05-31 | 2022-12-08 | 青岛海信激光显示股份有限公司 | Laser projection device and control method thereof |
| CN115657324A (en) * | 2022-12-09 | 2023-01-31 | 广东科视光学技术股份有限公司 | Light combining mechanism and optical lens |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03288187A (en) * | 1990-04-04 | 1991-12-18 | Mitsubishi Electric Corp | Projection type display device |
| US7128421B2 (en) * | 2004-03-29 | 2006-10-31 | Infocus Corporation | Thermal management of projection apparatus |
| JP5049644B2 (en) * | 2006-05-12 | 2012-10-17 | 三洋電機株式会社 | Light source control device and video display device |
| CN101071259A (en) * | 2006-05-12 | 2007-11-14 | 三洋电机株式会社 | Optical source control device and image display device |
| CN101957543B (en) * | 2009-07-14 | 2012-02-15 | 台达电子工业股份有限公司 | Projector and drive voltage regulating method thereof |
| CN113253559A (en) * | 2021-05-31 | 2021-08-13 | 青岛海信激光显示股份有限公司 | Laser projection equipment and laser projection system |
-
2021
- 2021-05-31 CN CN202110602333.1A patent/CN113253559A/en active Pending
-
2022
- 2022-05-31 WO PCT/CN2022/096487 patent/WO2022253246A1/en active Application Filing
- 2022-05-31 CN CN202280037927.5A patent/CN117377907A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022253246A1 (en) * | 2021-05-31 | 2022-12-08 | 青岛海信激光显示股份有限公司 | Laser projection device and control method thereof |
| CN115657324A (en) * | 2022-12-09 | 2023-01-31 | 广东科视光学技术股份有限公司 | Light combining mechanism and optical lens |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022253246A1 (en) | 2022-12-08 |
| CN117377907A (en) | 2024-01-09 |
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