CN114900674B - Display control method and device for DMD and storage medium - Google Patents

Display control method and device for DMD and storage medium Download PDF

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Publication number
CN114900674B
CN114900674B CN202210419470.6A CN202210419470A CN114900674B CN 114900674 B CN114900674 B CN 114900674B CN 202210419470 A CN202210419470 A CN 202210419470A CN 114900674 B CN114900674 B CN 114900674B
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value
dmd
image
displayed
gray value
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CN114900674A (en
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崔荣荣
郭大勃
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Qingdao Hisense Laser Display Co Ltd
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Qingdao Hisense Laser Display Co Ltd
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Priority to PCT/CN2023/084274 priority patent/WO2023202330A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/3144—Cooling systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits
    • H04N9/69—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits for modifying the colour signals by gamma correction

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Projection Apparatus (AREA)

Abstract

The embodiment of the application discloses a display control method, a device and a storage medium of a DMD, belonging to the field of image display. In the embodiment of the application, different temperature thresholds are determined according to different gray values of displayed images, and then the working temperature value of the DMD is adjusted in real time based on the different temperature thresholds, so that the working temperature value of the DMD in the process of displaying different images can be lower than the working temperature threshold corresponding to the corresponding image.

Description

Display control method and device for DMD and storage medium
Technical Field
The present invention relates to the field of image display, and in particular, to a method and apparatus for controlling display of a DMD and a storage medium.
Background
A digital micromirror device (Digital Micromirror Device, DMD) is one of the main devices of projection systems. The DMD includes a plurality of micromirrors, one for each pixel. The gray value of each pixel point in the displayed image is controlled by controlling the on or off state of each micro mirror in the period of displaying one frame of image and the period of being on or off, so that the display of the image is realized. In controlling the operation of the DMD, if the control is not proper, the life of the DMD may be shortened. Based on this, it is desirable to provide a method for performing display control on the DMD to increase the lifetime of the DMD.
Disclosure of Invention
The embodiment of the application provides a display control method, a display control device and a storage medium for a DMD, which can improve the service life of the DMD. The technical scheme is as follows:
in one aspect, a display control method of a DMD is provided, the method including:
acquiring a gray value of an image to be displayed, wherein the image to be displayed is a next frame of image of the current display image;
determining a first working temperature threshold of the DMD corresponding to the image to be displayed based on the gray value of the image to be displayed;
and if the current working temperature value of the DMD is higher than the first working temperature threshold value, controlling the working temperature value of the DMD to be reduced so that the working temperature value of the DMD in the process of displaying the image to be displayed is not higher than the first working temperature threshold value.
Optionally, the determining, based on the gray value of the image to be displayed, the first working temperature threshold of the DMD corresponding to the image to be displayed includes:
acquiring a standard life value of the DMD;
determining a first micro mirror bearing duty ratio of the DMD when the image to be displayed is displayed based on the gray value of the image to be displayed;
the first operating temperature threshold is determined based on the first micromirror bearing duty cycle and the standard lifetime value.
Optionally, the determining the first operating temperature threshold based on the first micromirror bearing duty cycle and the standard lifetime value includes:
acquiring a reference life value at a reference temperature;
acquiring a life acceleration factor corresponding to the bearing duty ratio of the reference micromirror;
and determining the first working temperature threshold based on the standard life value, the reference temperature, a life acceleration factor corresponding to the reference micromirror bearing duty cycle and the first micromirror bearing duty cycle.
Optionally, the determining the first operating temperature threshold based on the standard lifetime value, the reference temperature, a lifetime acceleration factor corresponding to the reference micromirror bearing duty cycle, and the first micromirror bearing duty cycle includes:
determining the first operating temperature threshold by the following formula;
wherein L is the standard lifetime value, theFor the reference lifetime value, ΔE is a preset failure mechanism activation energy value, and k is BoltzA Mann constant, wherein P is a molecule in the first micromirror bearing duty cycle, used for representing a time percentage of the micromirror bearing in the DMD in a light-on state, M is a denominator in the first micromirror bearing duty cycle, used for representing a time percentage of the micromirror bearing in the DMD in a light-off state, beta is a life acceleration factor corresponding to a reference micromirror bearing duty cycle, and T is a life acceleration factor corresponding to the reference micromirror bearing duty cycle c For the reference temperature, T is i Is the first operating temperature threshold.
Optionally, the determining, based on the gray value of the image to be displayed, the first micromirror bearing duty cycle of the DMD when displaying the image to be displayed includes:
determining the first micromirror bearing duty cycle based on the gray value of the image to be displayed by the following formula;
wherein the saidAnd bearing a duty ratio for the first micro mirror, wherein G is the gray value of the image to be displayed.
Optionally, said controlling the operation temperature value of the DMD to decrease includes:
and sending a first control command to a heat radiating unit, wherein the heat radiating unit comprises a heat radiating fan for radiating the DMD, and the first control command is used for indicating to increase the rotating speed of the heat radiating fan so as to reduce the working temperature value of the DMD.
Optionally, the method further comprises:
and if the current working temperature value of the DMD is not higher than the first working temperature threshold value, maintaining the working temperature value of the DMD to be not higher than the first working temperature threshold value.
Optionally, the acquiring the gray value of the image to be displayed includes:
acquiring red, green and blue RGB gray values of each pixel point in the image to be displayed;
Determining the gray value of each pixel point based on the RGB gray value of each pixel point in the image to be displayed;
and determining the gray value of the image to be displayed based on the gray value of each pixel point in the image to be displayed.
Optionally, the determining the gray value of each pixel point based on the RGB gray value of each pixel point in the image to be displayed includes:
determining an initial gray value of a first pixel point based on a primary color percentage corresponding to an R gray value, a G gray value and a B gray value in RGB values of the first pixel point and the RGB gray value of the first pixel point, wherein the first pixel point is any pixel point in the image to be displayed;
and gamma correction is carried out on the initial gray value of the first pixel point, so that the gray value of the first pixel point is obtained.
In another aspect, there is provided a display control apparatus of a DMD, the apparatus including:
the acquisition module is used for acquiring the gray value of an image to be displayed, wherein the image to be displayed is the next frame of image of the current display image;
the determining module is used for determining a first working temperature threshold value of the DMD corresponding to the image to be displayed based on the gray value of the image to be displayed;
And the control module is used for controlling the working temperature value of the DMD to be reduced if the current working temperature value of the DMD is higher than the first working temperature threshold value, so that the working temperature value of the DMD in the process of displaying the image to be displayed is not higher than the first working temperature threshold value.
Optionally, the determining module is mainly configured to:
acquiring a standard life value of the DMD;
determining a first micro mirror bearing duty ratio of the DMD when the image to be displayed is displayed based on the gray value of the image to be displayed;
the first operating temperature threshold is determined based on the first micromirror bearing duty cycle and the standard lifetime value.
Optionally, the determining module is mainly configured to:
acquiring a reference life value at a reference temperature;
acquiring a life acceleration factor corresponding to the bearing duty ratio of the reference micromirror;
and determining the first working temperature threshold based on the standard life value, the reference temperature, a life acceleration factor corresponding to the reference micromirror bearing duty cycle and the first micromirror bearing duty cycle.
Optionally, the determining module is mainly configured to:
determining the first operating temperature threshold by the following formula;
Wherein L is the standard lifetime value, theFor the reference lifetime value, Δe is a preset failure mechanism activation energy value, k is a boltzmann constant, P is a molecule in the first micromirror bearing duty cycle, used for representing a time percentage of the first micromirror bearing in the light-on state, M is a denominator in the first micromirror bearing duty cycle, used for representing a time percentage of the first micromirror bearing in the light-off state, β is a lifetime acceleration factor corresponding to the reference micromirror bearing duty cycle, and T c For the reference temperature, T is i Is the first operating temperature threshold.
Optionally, the determining module is mainly configured to:
determining the first micromirror bearing duty cycle based on the gray value of the image to be displayed by the following formula;
wherein the saidAnd bearing a duty ratio for the first micro mirror, wherein G is the gray value of the image to be displayed.
Optionally, the control module is mainly configured to:
and sending a first control command to a heat radiating unit, wherein the heat radiating unit comprises a heat radiating fan for radiating the DMD, and the first control command is used for indicating to increase the rotating speed of the heat radiating fan so as to reduce the working temperature value of the DMD.
Optionally, the device is further configured to:
and if the current working temperature value of the DMD is not higher than the first working temperature threshold value, maintaining the working temperature value of the DMD to be not higher than the first working temperature threshold value.
Optionally, the acquiring module is mainly configured to:
acquiring red, green and blue RGB gray values of each pixel point in the image to be displayed;
determining the gray value of each pixel point based on the RGB gray value of each pixel point in the image to be displayed;
and determining the gray value of the image to be displayed based on the gray value of each pixel point in the image to be displayed.
Optionally, the acquiring module is mainly configured to:
determining an initial gray value of a first pixel point based on a primary color percentage corresponding to an R gray value, a G gray value and a B gray value in RGB values of the first pixel point and the RGB gray value of the first pixel point, wherein the first pixel point is any pixel point in the image to be displayed;
and gamma correction is carried out on the initial gray value of the first pixel point, so that the gray value of the first pixel point is obtained.
In another aspect, there is provided a display control apparatus of a DMD, the apparatus including:
a processor;
A memory for storing processor-executable instructions;
wherein the processor executes the executable instructions in the memory to perform the display control method of the DMD described above.
In another aspect, there is provided a computer-readable storage medium having stored therein a computer program which, when executed by a computer, implements the steps of the DMD display control method described above.
In another aspect, a computer program product is provided containing instructions that, when run on a computer, cause the computer to perform the steps of the display control method of a DMD as described above.
The beneficial effects that technical scheme that this application embodiment provided include at least:
in the embodiment of the application, different temperature thresholds are determined according to different gray values of displayed images, and then the working temperature value of the DMD is adjusted in real time based on the different temperature thresholds, so that the working temperature value of the DMD in the process of displaying different images can be lower than the working temperature threshold corresponding to the corresponding image.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a system architecture diagram related to a display control method of a DMD provided in an embodiment of the present application;
fig. 2 is a system architecture diagram related to another display control method of a DMD provided in an embodiment of the present application;
fig. 3 is a flowchart of a method for controlling display of a DMD according to an embodiment of the present application;
FIG. 4 is a graph showing the life values of the DMD corresponding to different operating temperature values and micromirror bearing duty cycles when 65℃is used as a reference temperature, 10000 hours is used as a reference life value, and 5/95 is used as a reference micromirror bearing duty cycle in the embodiment of the present application;
FIG. 5 is a graph of the effect of micromirror bearing duty cycle and operating temperature on the life value of a DMD provided by an embodiment of the present application;
fig. 6 is a schematic structural diagram of a display control device of a DMD according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Before explaining the embodiments of the present application in detail, a description is given of a system architecture related to the embodiments of the present application.
Fig. 1 is a system architecture diagram related to a display control method of a DMD according to an embodiment of the present application. As shown in fig. 1, the system includes a control device 101, a DMD102, a temperature detection unit 103, and a heat dissipation unit 104. Wherein the control device 101 establishes communication connections with the DMD102, the temperature detection unit 103 and the heat dissipation unit 104, respectively.
In the process of displaying the current image, the control device 101 may acquire a next frame image of the current image, that is, an image to be displayed, and determine a first operating temperature threshold of the DMD102 corresponding to the image to be displayed according to a gray value of the image to be displayed, where the first operating temperature threshold is a highest allowable operating temperature of the DMD when the image to be displayed is displayed. After determining the first operation temperature threshold value, the control device 101 controls the operation temperature value of the DMD102 in the subsequent display of the image to be displayed based on the first operation temperature threshold value.
For example, referring to fig. 2, the control device 101 may include a processing unit 1011 and an MCU1012 (Microcontroller Unit, micro control unit). The processing unit 1011 is configured to acquire an image signal, and decode the image signal to obtain an image to be displayed. The image signal may be a video signal, and accordingly, the image to be displayed may be a frame of video image. After obtaining the image to be displayed, the processing unit 1011 may determine a gray value of the image to be displayed, further determine a first micromirror bearing duty ratio of the DMD102 when the image to be displayed is displayed based on the gray value of the image to be displayed, determine a first operating temperature threshold of the DMD102 in the process of displaying the image to be displayed based on the first micromirror bearing duty ratio, and send the first operating temperature threshold to the MCU1012. After determining the first working temperature threshold, the processing unit 1011 may further load data to the DMD102 based on the gray value of each pixel point in the image to be displayed, so as to control the DMD102 to perform light modulation based on the loaded data, so as to realize the display of the image to be displayed.
It should be noted that, during the process of displaying an image, the temperature detecting unit 103 may detect the internal operating temperature value of the DMD102 in real time. The temperature detecting unit 103 may report the detected operating temperature value of the DMD102 to the control device 101 in real time whenever the operating temperature value of the DMD102 is detected. Based on this, in the process of displaying the current image, after determining the first operating temperature threshold, the control device 101 may control the heat dissipation unit 104 to dissipate heat from the DMD102 based on the current operating temperature value of the DMD102 detected by the temperature detection unit 103 and the first operating temperature threshold, so as to adjust the operating temperature value of the DMD102, so that the operating temperature value of the DMD in the process of subsequently displaying the image to be displayed is not higher than the first operating temperature threshold.
The DMD102 and the temperature detecting unit 103 are both mounted on the DMD board, and the temperature detecting unit 103 is connected with the DMD102 to measure the internal working temperature value of the DMD102, so that the measuring method is more accurate and has higher precision. The temperature detecting unit 103 may be a temperature measuring control circuit.
In addition, referring to fig. 2, the heat radiating unit 104 may include a heat radiating fan 1041 and a heat radiator 1042. Wherein the heat dissipation fan 1041 faces the DMD102, and the heat sink 1042 contacts the DMD 102. The heat dissipation fan 1041 and the heat sink 1042 are used for dissipating heat of the DMD102, and besides, the heat dissipation fan 1041 may be used for dissipating heat of the heat sink 1042. On this basis, after the foregoing MCU1012 receives the current operating temperature value of the DMD102 reported by the temperature detecting unit 103 during the process of displaying the current image, if the current operating temperature value of the DMD102 is higher than the first operating temperature threshold, the MCU1012 may send a control instruction to the heat dissipating unit 104 to instruct the heat dissipating unit 104 to control the rotation speed of the heat dissipating fan 1041 to increase, so as to improve the heat dissipating effect, thereby reducing the operating temperature value of the DMD102, so that the operating temperature value of the DMD during the subsequent process of displaying the image to be displayed is not higher than the first operating temperature threshold.
Next, a method for controlling the display of the DMD provided in the embodiment of the present application will be described.
Fig. 3 is a flowchart of a method for controlling display of a DMD according to an embodiment of the present application. The method may be applied to the control apparatus described in the above embodiment. As shown in fig. 3, the method comprises the steps of:
step 301: and acquiring the gray value of the image to be displayed.
In the embodiment of the present application, the image to be displayed refers to the image of the next frame of the image currently being displayed. The control device may decode the received image signal to obtain the image to be displayed. The image signal may be a video signal, and accordingly, the image to be displayed may be a frame of video image. Of course, in some possible implementations, the image to be displayed may also be a static image, which is not limited in this embodiment of the present application.
After obtaining the image to be displayed, the control device may obtain an RGB (Red Green Blue) gray value of each pixel in the image to be displayed, and determine the gray value of the corresponding pixel based on the RGB gray value of each pixel in the image to be displayed; and determining the gray value of the image to be displayed based on the gray value of each pixel point in the image to be displayed.
For convenience of description, the implementation process of determining the gray value of a pixel is described by taking any pixel in an image to be displayed as an example, and the pixel is referred to as a first pixel. The control device may obtain a primary color percentage corresponding to the R gray value, a primary color percentage corresponding to the G gray value, and a primary color percentage corresponding to the B gray value in the RGB gray values of the first pixel point. And determining the gray value of the first pixel point based on the RGB gray value of the first pixel point and the primary color percentages corresponding to the R gray value, the B gray value and the G gray value respectively.
It should be noted that each pixel is composed of three primary colors, that is, red, green, and blue, that is, the RGB gray values of each pixel point include an R gray value, a G gray value, and a B gray value. In the display process of one frame of image, in order to reach a white balance point, the three primary color display time has respective percentages in the display period, and the sum of the three primary color display time is 100%. Based on this, the control device can acquire the red percentage, the green percentage, and the blue percentage of the image to be displayed in the case where the white balance is satisfied. And taking the red percentage as a primary color percentage corresponding to the R gray value in the first pixel point, taking the green percentage as a primary color percentage corresponding to the G gray value in the first pixel point, and taking the blue percentage as a primary color percentage corresponding to the B gray value in the first pixel point.
After obtaining the primary color percentages corresponding to the R gray value, the G gray value, and the B gray value, respectively, of the RGB gray values obtained for the first pixel point, the control device may calculate the initial gray value for the first pixel point through the following formula 1.
G 0 ＝G R *p R +G G *p G +G B *p B (1)
Wherein G is 0 G is the initial gray value of the first pixel point R For R gray value, p R G is the primary color percentage corresponding to the R gray value G Is G gray value, p G G is the primary color percentage corresponding to the G gray value B Is B gray value, p B The primary color percentage corresponding to the B gray value.
For example, assuming that the image to be displayed has 50% of red, 20% of green, 30% of blue, 40% of R gray, 100% of G, and 0 of B in the case of satisfying white balance, the initial gray of the first pixel may be determined to be 40% by the above formula 1.
After determining the initial gray value of the first pixel, the control device may further perform gamma correction on the initial gray value of the first pixel, so as to obtain the gray value of the first pixel, since the perception of brightness by human eyes is not proportional to the optical power. Wherein the control device may correct the initial gray value of the first pixel point by the following formula 2.
G＝AG 0 Gamma (2)
Wherein G is the gray value of the first pixel point, A is a preset scaling factor, the value of the scaling factor is usually 1, gamma is a preset power exponent, and the value can be usually 2.2.
For example, assuming that the initial gray value of the first pixel is 40%, the gray value of the first pixel obtained after correcting the initial gray value by the above formula 2 is 13%.
For each pixel point in the image to be displayed, the control device can calculate the gray value of the corresponding pixel point through the method. Thereafter, the control device may determine the gray value of the image to be displayed based on the gray value of each pixel point in the image to be displayed.
For example, the control device may calculate an average value of the gradation values of the pixel points in the image to be displayed, and take the average value as the gradation value of the image to be displayed. Alternatively, the control device may acquire the mode of the gradation values of the pixel points in the image to be displayed as the gradation value of the image to be displayed. Of course, the control device may also count the gray values of the pixel points in the image to be displayed by using other statistical methods, so as to determine the gray value of the image to be displayed based on the statistical result, which is not limited in the embodiment of the present application.
Step 302: and determining a first working temperature threshold of the DMD corresponding to the image to be displayed based on the gray value of the image to be displayed.
In one possible implementation, the control device obtains a standard lifetime value of the DMD, and determines a first micromirror bearing duty cycle of the DMD when displaying the image to be displayed based on a gray value of the image to be displayed. A first operating temperature threshold is determined based on the first micromirror bearing duty cycle and the standard lifetime value.
The standard lifetime value of the DMD may refer to a specified lifetime value of the DMD, for example, a specified lifetime value of the DMD of the model provided by a manufacturer at the time of shipment of the DMD. In the embodiment of the application, the control device may be preset with mapping relations between DMDs of different models and corresponding standard lifetime values. Based on this, the control device may acquire the corresponding standard lifetime value from the map according to the model of the DMD. Alternatively, the above-described map may be stored in other devices, so that the control device may acquire the standard lifetime value of the DMD from the other devices according to the model of the DMD. Alternatively, since the standard lifetime value of the DMD may also be directly stored in the control device if the control device and the DMD are provided by the same service provider, the control device may directly acquire the stored standard lifetime value of the DMD.
In addition, the control device may further determine a first micromirror bearing duty ratio of the DMD when displaying the image to be displayed based on the gray value of the image to be displayed. Wherein the first micromirror bearing duty cycle is used to characterize the percentage of the duration that the micromirrors in the DMD are in the light on state and in the light off state during the display of the image to be displayed.
It should be noted that, each pixel point in a frame of image corresponds to one micromirror in the DMD. When displaying a frame of image, the DMD can control the corresponding micromirror to turn over based on the gray value of the pixel point corresponding to each micromirror, so that the micromirrors are switched between an on state and an off state, and the lengths of time the micromirrors are controlled to be in different states, so that the gray value of the pixel point corresponding to the corresponding micromirror is presented through the accumulation of the power of the light beam reflected to the projection lens by each micromirror in the on state. However, when the micromirror is operated in a certain state for a long time, a micro residual tilt angle may exist in the micromirror during the control of the micromirror to turn over, so that the micromirror cannot effectively turn over to another state, and thus the micromirror is abnormal in function, and the corresponding pixel point cannot be displayed correctly. In other words, the greater the difference in the time period duty cycle of the micromirrors in the two different states, the more likely the micromirrors will fail, thereby resulting in a shortened lifetime of the DMD. Because the proportion of the time length duty ratio of the micro mirror in different states is the micro mirror bearing duty ratio, the larger the absolute value of the difference value between the molecule and the denominator of the micro mirror bearing duty ratio is, the more unbalanced the time length of the micro mirror in the light opening state and the light closing state is, and the larger the influence on the service life of the DMD is. The principle of displaying the pixel point by the micromirror in the DMD is known that the duration of the micromirror in the light-on state is different, the accumulated power reflected to the projection lens is different, and the final gray value is different. That is, the time period of the micromirror in different states is mainly determined by the gray value of the pixel corresponding to the micromirror. Based on this, in the embodiment of the application, the control device may determine, based on the gray value of the image to be displayed, the first micromirror bearing duty ratio of the DMD during displaying the image to be displayed, so as to characterize the time duty ratio of the micromirrors in the DMD in the light-on state and the light-off state during displaying the image to be displayed.
Illustratively, the control device may determine the first micromirror bearing duty ratio by the following equation 3 based on the gray value of the image to be displayed.
Wherein,and G is the gray value of the image to be displayed for the first micromirror bearing duty cycle.
For example, assuming that the gray level of the image to be displayed is 40%, the first micromirror bearing duty cycle is 40:60.
After determining the first micromirror bearing duty cycle, the control device may obtain a reference lifetime value at a reference temperature; acquiring a life acceleration factor corresponding to the bearing duty ratio of the reference micromirror; the first operating temperature threshold is determined based on the standard lifetime value, the reference temperature, the reference micromirror bearing duty cycle, the corresponding lifetime acceleration factor, and the first micromirror bearing duty cycle.
Wherein, the reference temperature and the reference life value under the reference temperature are both preset. For example, the reference temperature and the reference lifetime value may be provided by the manufacturer of the DMD, in which case the control device may obtain the reference temperature and the corresponding reference lifetime value from the product data of the DMD. Alternatively, the reference temperature and the reference lifetime value may be set by the user, in which case the reference lifetime value may be determined from a test lifetime value obtained by testing a plurality of DMD test samples whose operating temperature is maintained at the reference temperature. That is, a plurality of DMD test samples of the same model as the DMD may be controlled to operate at a reference temperature to obtain test life values of the test samples of the plurality of DMDs, and then the reference life value is determined based on the test life values of the plurality of test samples. For example, the average value of the plurality of test lifetime values is taken as the reference lifetime value, or the mode in the plurality of test lifetime values is taken as the reference lifetime value, which is not limited in the embodiment of the present application.
In addition, since the larger the absolute value of the difference between the numerator and denominator of the duty cycle against which the micromirror bears, the more serious the adverse effect on the DMD, that is, the easier it is to shorten the lifetime of the DMD. Therefore, for a certain operating temperature, the lifetime of the DMD is the minimum lifetime value of the DMD at the operating temperature when the duty cycle of the micromirror is 100:0 or 0:100. However, since the actual application is very few, the micromirror bearing duty cycle is 100:0 or 0:100, in the embodiment of the present application, 5:95 and 95:5 can be used as the reference micromirror bearing duty cycle. Of course, other values may be used as the reference micromirror bearing duty cycle, which is not limited in the embodiments of the present application.
After determining the reference micromirror bearing duty cycle, the control device may determine a lifetime acceleration factor corresponding to the reference micromirror bearing duty cycle based on the reference micromirror bearing duty cycle by the following equation 4.
Wherein beta is a life acceleration factor corresponding to the bearing duty ratio of the reference micromirror, P c For reference micromirror bearing against molecules in duty cycle, M c Is the denominator in the reference micromirror bearing duty cycle. The lifetime acceleration factor is 100/90 when the reference micromirror duty cycle is 5:95 or 95:5.
After obtaining the standard lifetime value, the reference temperature, the reference micromirror bearing duty cycle, the corresponding lifetime acceleration factor, and the first micromirror bearing duty cycle, the control device may calculate the first operating temperature threshold of the DMD by the following equation 5.
Wherein L is the standard life value of the DMD, T c For reference temperature, L Tc Is a reference lifetime value. Δe is a preset failure mechanism activation energy value, k is a boltzmann constant, P is a molecule in the first micromirror bearing duty cycle, M is a denominator in the first micromirror bearing duty cycle, and β is a lifetime acceleration factor corresponding to the reference micromirror bearing duty cycle. Wherein, when β is 100/90, the following equation 6 can be obtained from the above equation 5.
As can be seen from the above formulas 5 and 6, the first operating temperature threshold is actually the highest operating temperature threshold of the DMD required to ensure that the lifetime of the DMD is the standard lifetime value during the process of displaying the image to be displayed, that is, in the case that the micromirror bearing duty cycle of the DMD is the first micromirror bearing duty cycle.
It should be noted that Δe in the above formulas 5 and 6 may be provided by the manufacturer of the DMD. Alternatively, the DMD may be determined based on test data obtained by testing a plurality of DMD test samples.
For example, when Δe is determined by the test data, the plurality of DMD test samples may be divided into at least two sample groups, each sample group including a plurality of test samples and each sample group corresponding to one test temperature, wherein the test temperature corresponding to a certain sample group of the at least two sample groups is the aforementioned reference temperature, and for convenience of explanation, the sample group corresponding to the test temperature being the reference temperature is referred to as the reference sample group. For each sample group, controlling the working temperature of the DMD test samples in the sample group to be maintained at the corresponding test temperature so as to obtain the test life value of each DMD test sample in the sample group. Then, based on the test life value of each DMD test sample in the sample group, the test life value of the sample group at the corresponding test temperature is determined. For example, an average value or mode of test lifetime values of DMD test samples included in the sample group is determined as the test lifetime value at the test temperature to which the sample group corresponds. By the method, the test life values corresponding to at least two test temperatures can be obtained. Setting the life acceleration factor of DMD corresponding to the reference temperature to 1, dividing T by at least two test temperatures based on the test life value corresponding to the reference temperature and the life acceleration factor c At any temperature T outside i T is determined by the following equation 7 i A corresponding life acceleration factor.
Wherein AF is the same as i For a test temperature of T i Life acceleration factor, AF c For the test temperature to be the reference temperature T c The corresponding life acceleration factor is equal to 1.Is T i The corresponding test lifetime value is used to determine,/>is T c Corresponding test lifetime values.
At the determination of AF i After that, Δe can be determined based on the following formulas 8 and 9.
Wherein Q is the degradation rate of the DMD at a temperature T, A 0 Is a constant, and k is a boltzmann constant. Based on this, the first and second light sources,at a temperature T for DMD c Rate of deterioration below->At a temperature T for DMD i The rate of degradation below.
T is the same as i Can be T in at least two test temperatures c The difference between the two is the largest. Alternatively, in one possible implementation, T may be divided by at least two test temperatures by the method described above c Each of the other test temperatures is calculated to obtain a corresponding Δe, and then an average value of Δes corresponding to the respective test temperatures is taken as a final Δe. In addition, the temperatures in the above formulas 5 to 9 all refer to thermodynamic temperatures.
For example, assume T c 65 ℃, T i Is 25 ℃,10000 hours, & gt >794512 hours, AF can be determined by the above equation 3 i Equal to 79.4512. Then, based on equation 5, Δe can be determined to be 0.95096eV.
Illustratively, based on the relationship between temperature, micromirror bearing duty cycle and lifetime value given in equation 5 above, fig. 4 shows the corresponding lifetime value for a DMD at different operating temperatures and micromirror bearing duty cycles with a reference temperature of 65 degrees and a reference lifetime value of 10000 hours and a reference micromirror bearing duty cycle of 5:95.
Based on equation 5 above and fig. 4, fig. 5 provides a graph of the effect of micromirror bearing duty cycle and operating temperature on the lifetime value of the DMD. As shown in fig. 5, the lifetime value of the DMD corresponding to any point on the curve is the same with the micromirror bearing duty ratio on the horizontal axis and the operating temperature of the DMD on the vertical axis, i.e., the curve in fig. 5 is a two-dimensional relationship curve formed by points of different operating temperatures and micromirror bearing duty ratios with the lifetime value being the same. As can be seen from fig. 5, at the same lifetime value, the larger the difference between the numerator and the denominator in the duty cycle of the micromirror of the DMD, the lower the corresponding maximum allowable operating temperature, and conversely, the smaller the difference between the numerator and the denominator in the duty cycle of the micromirror, the higher the corresponding maximum allowable operating temperature. In other words, in the case where the molecular and denominator of the duty cycle of the micromirror are greatly different, the DMD may be operated with a lower operating temperature as appropriate in order to increase the lifetime of the DMD.
The foregoing is an implementation manner of determining the first operating temperature threshold of the DMD according to the embodiment of the present application, and optionally, in another possible implementation manner, the control device may store the first operating temperature threshold corresponding to the DMD under different duty cycles under different lifetime values. Based on the above, the control device may directly obtain the first operating temperature threshold corresponding to the first micromirror bearing duty cycle under the target lifetime value after determining the first micromirror bearing duty cycle.
Step 303: and if the current working temperature value of the DMD is higher than the first working temperature threshold value, controlling the working temperature value of the DMD to be reduced so that the working temperature value of the DMD in the process of displaying the image to be displayed is not higher than the first working temperature threshold value.
After determining the first operation temperature threshold of the DMD at the time of displaying the image to be displayed through the above-described step 302, the control device may control the operation temperature of the DMD based on the first operation temperature threshold of the DMD so that the DMD operates at a temperature lower than the first operation temperature threshold.
Illustratively, the DMD is typically mounted on a DMD board, and in this embodiment, a temperature detecting unit may be further mounted on the DMD board, and the temperature detecting unit is connected to the DMD, and may detect an internal operation temperature of the DMD in real time and report the detected operation temperature to the control device. Based on this, in the embodiment of the present application, after determining the first operating temperature threshold, the control device may receive the current operating temperature value of the DMD reported by the temperature detection unit, and compare the current operating temperature value of the DMD with the first operating temperature threshold. The control device may send a first control command to the heat sink unit if the current operating temperature value of the DMD is above the first operating temperature threshold. The heat dissipation unit comprises a heat dissipation fan for dissipating heat of the DMD, and the first control command is used for indicating to increase the rotating speed of the heat dissipation fan.
As is apparent from the foregoing description, the heat dissipating unit includes a heat dissipating fan and a heat sink in contact with the DMD. If the detected current working temperature value of the DMD is not smaller than the first working temperature threshold value, the control device can control the rotation speed of the cooling fan to rise, so that on one hand, the cooling effect of the cooling fan on the DMD can be enhanced, and on the other hand, the cooling effect of the cooling fan on the radiator can be improved, so that the cooling effect of the radiator on the DMD is improved, the working temperature of the DMD is reduced, and the working temperature value of the DMD can be not higher than the first working temperature threshold value in the process of displaying an image to be displayed later.
Alternatively, the control device may maintain the operating temperature value of the DMD not higher than the first operating temperature threshold if the current operating temperature value of the DMD is lower than the first operating temperature threshold.
Wherein, in case the current operating temperature value of the DMD is lower than the first operating temperature threshold value, the control device may further calculate a temperature difference between the first operating temperature threshold value and the current operating temperature of the DMD. And comparing the temperature difference with a reference threshold, if the temperature difference is larger than the reference threshold, the current working temperature value is more different from the first working temperature threshold, and the first working temperature threshold cannot be reached in a short time, in which case the control device can temporarily not adjust the rotation speed of the cooling fan, that is, maintain the rotation speed of the current cooling fan, so as to ensure that the subsequent working temperature value of the DMD can be lower than the first working temperature threshold. Of course, if the temperature difference is not greater than the reference threshold, it means that the current operating temperature value is less than the first operating temperature threshold, but is not much different from the first operating temperature threshold, in which case, as the DMD operating time is prolonged, the operating temperature value of the DMD after the display of the image to be displayed is likely to exceed the first operating temperature threshold, so that the control device may appropriately raise the rotation speed of the heat dissipating fan to enhance the heat dissipating effect of the heat dissipating fan, thereby ensuring that the operating temperature value of the DMD after the display of the image to be displayed is able to be lower than the first operating temperature threshold. In this case, the control device may control the magnitude of the increase in the rotation speed of the radiator fan to be lower than that in the case where the aforementioned current operating temperature value is higher than the first operating temperature threshold value.
Alternatively, in another possible implementation, the controller may determine a second operating temperature threshold in advance from the first operating temperature threshold of the DMD, wherein the second operating temperature threshold is less than the first operating temperature threshold, e.g., the second operating temperature threshold is equal to the first operating temperature threshold minus a reference threshold. Based on this, when the controller receives the current operating temperature value of the DMD reported by the temperature detection unit, the control device may compare the current operating temperature value of the DMD with the second operating temperature threshold. If the current working temperature value of the DMD is higher than the second working temperature threshold value, the control equipment can send a first control command to the heat radiating unit so as to increase the rotating speed of the heat radiating fan, thereby preventing the working temperature of the subsequent DMD from continuously rising beyond the first working temperature threshold value. Optionally, if the current working temperature value of the DMD is not higher than the second working temperature threshold, the control device may obtain the working temperature value of the DMD received from the temperature detecting unit within a preset period before the current time, and sort the working temperature values at each time including the current time according to the chronological order. And then, calculating the temperature difference between every two adjacent working temperature values to obtain at least two temperature differences. If the at least two temperature differences are positive numbers and increase along with time, the working temperature value of the DMD is indicated to be accelerated and increased all the time, at this time, the control device can send a first control command to the heat radiating unit to increase the rotating speed of the heat radiating fan, so that the effect of intervention in advance is achieved, and the working temperature value of the DMD is prevented from being rapidly increased to the first working temperature threshold value. If the at least two temperature differences are both positive numbers and decrease with time, it is indicated that the rate of rise of the operating temperature of the DMD is decreasing, at which time the control device may not adjust the rotational speed of the radiator fan. If the at least two temperature differences are negative, it is indicated that the working temperature of the DMD is always decreasing, in which case the control device may not adjust the rotational speed of the cooling fan, or the control device may send a second control command to the cooling unit to decrease the rotational speed of the cooling fan.
After adjusting the rotation speed of the cooling fan based on the current working temperature value, subsequently, in the process of displaying the image to be displayed, the control device can continuously receive the working temperature value of the DMD, which is detected and reported in real time by the temperature detection unit, and adjust the rotation speed of the cooling fan based on the working temperature value of the DMD and the first working temperature threshold value, which are received in real time, by referring to the method described above, so as to control the working temperature value of the DMD not to be higher than the first working temperature threshold value in the process of displaying the image to be displayed.
It should be noted that, in the embodiment of the present application, before each frame of image is displayed, the control device may perform the above steps with the frame of image as the image to be displayed, so as to control the working temperature value of the DMD to be not higher than the working temperature threshold value of the DMD corresponding to the frame of image in the process of displaying the frame of image. Of course, in some possible implementations, the control device may also acquire a frame of an image to be displayed at intervals of a preset time, determine an operating temperature threshold based on the image to be displayed, and then control the operating temperature value of the DMD within the next preset time interval, that is, with the operating temperature threshold as a reference, to not exceed the temperature threshold within the preset time interval. Or, the control device may acquire a frame of image to be displayed every N frames of images, determine a working temperature threshold based on the image to be displayed, and then, in the process of displaying n+1 frames of images including the image to be displayed, that is, with the working temperature threshold as a reference, control the working temperature value of the DMD not to exceed the temperature threshold.
In the embodiment of the application, different temperature thresholds are determined according to the gray values of different images, and then the working temperature value of the DMD is adjusted in real time based on the different temperature thresholds, so that the working temperature value of the DMD in the process of displaying different images can be lower than the working temperature threshold corresponding to the corresponding image.
In addition, in the embodiment of the application, a relation formula among the micromirror bearing duty ratio, the temperature and the service life value of the DMD can be obtained by testing a plurality of DMD test samples, and further, a first working temperature threshold corresponding to the micromirror bearing duty ratio when different images are displayed is determined based on the relation formula, so that the control of the working temperature of the DMD when different images are displayed is realized.
Next, a description will be given of a display control device of the DMD provided in the embodiment of the present application.
Referring to fig. 6, an embodiment of the present application provides a display control device 600 for a DMD, the device 600 including:
The obtaining module 601 is configured to obtain a gray value of an image to be displayed, where the image to be displayed is a next frame image of the currently displayed image;
the determining module 602 is configured to determine a first operating temperature threshold of the DMD corresponding to the image to be displayed based on the gray value of the image to be displayed;
and the control module 603 is configured to control the DMD to decrease the operation temperature value if the current operation temperature value of the DMD is higher than the first operation temperature threshold value, so that the operation temperature value of the DMD in the process of displaying the image to be displayed is not higher than the first operation temperature threshold value.
Alternatively, the determining module 602 is mainly configured to:
obtaining a standard life value of the DMD;
determining a first micromirror bearing duty ratio of the DMD when displaying the image to be displayed based on the gray value of the image to be displayed;
a first operating temperature threshold is determined based on the first micromirror bearing duty cycle and the standard lifetime value.
Alternatively, the determining module 602 is mainly configured to:
acquiring a reference life value at a reference temperature;
acquiring a life acceleration factor corresponding to the bearing duty ratio of the reference micromirror;
and determining a first working temperature threshold based on the standard life value, the reference temperature, the life acceleration factor corresponding to the reference micromirror bearing duty cycle and the first micromirror bearing duty cycle.
Alternatively, the determining module 602 is mainly configured to:
determining a first operating temperature threshold by the following formula;
wherein L is a standard life value,for the reference lifetime value, ΔE is a preset failure mechanism activation energy value, and k isBoltzmann constant, P is a molecule in a first micro-mirror bearing duty cycle for representing the time percentage of the micro-mirror bearing in the DMD under the light on state, M is a denominator in the first micro-mirror bearing duty cycle for representing the time percentage of the micro-mirror bearing in the DMD under the light off state, beta is a life acceleration factor corresponding to a reference micro-mirror bearing duty cycle, T c For reference temperature, T i Is the first operating temperature threshold.
Alternatively, the determining module 602 is mainly configured to:
determining a first micromirror bearing duty cycle based on a gray value of an image to be displayed by the following formula;
wherein,and G is the gray value of the image to be displayed for the first micromirror bearing the duty cycle.
Optionally, the control module 603 is mainly configured to:
and sending a first control command to the heat radiating unit, wherein the heat radiating unit comprises a heat radiating fan for radiating the DMD, and the first control command is used for indicating to increase the rotating speed of the heat radiating fan so as to reduce the working temperature value of the DMD.
Optionally, the apparatus 600 is further configured to:
if the current operating temperature value of the DMD is not above the first operating temperature threshold, maintaining the operating temperature value of the DMD not above the first operating temperature threshold.
Alternatively, the acquiring module 601 is mainly configured to:
acquiring red, green and blue RGB gray values of each pixel point in an image to be displayed;
determining the gray value of each pixel point based on the RGB gray value of each pixel point in the image to be displayed;
and determining the gray value of the image to be displayed based on the gray value of each pixel point in the image to be displayed.
Alternatively, the acquiring module 601 is mainly configured to:
determining an initial gray value of a first pixel point based on a primary color percentage corresponding to an R gray value, a G gray value and a B gray value in RGB values of the first pixel point and the RGB gray value of the first pixel point, wherein the first pixel point is any pixel point in an image to be displayed;
and gamma correction is carried out on the initial gray value of the first pixel point, so that the gray value of the first pixel point is obtained.
In summary, in the embodiment of the present application, different temperature thresholds are determined according to the gray values of different images, and then the working temperature values of the DMD are adjusted in real time based on the different temperature thresholds, so that the working temperature values of the DMD in the process of displaying different images can be lower than the working temperature thresholds corresponding to the corresponding images.
It should be noted that, when the display control device for a DMD provided in the foregoing embodiment controls the DMD to display an image, only the division of the foregoing functional modules is used as an example, in practical application, the foregoing functional allocation may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to perform all or part of the functions described above. In addition, the embodiment of the method for controlling the display of the DMD of the display control device of the DMD provided in the foregoing embodiment belongs to the same concept, and the detailed implementation process of the method embodiment is detailed in the method embodiment, which is not repeated here.
The present embodiment also provides a computer-readable storage medium, which when executed by a processor, enables execution of the display control method of the DMD provided by the above embodiment. For example, the computer readable storage medium may be ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc. It is noted that the computer readable storage medium mentioned in the embodiments of the present application may be a non-volatile storage medium, in other words, may be a non-transitory storage medium.
It should be understood that all or part of the steps to implement the above-described embodiments may be implemented by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The computer instructions may be stored in the computer-readable storage medium described above.
That is, in some embodiments, there is also provided a computer program product containing instructions that, when run on a computer, cause the computer to perform the display control method of the DMD provided by the above embodiments.
The foregoing description is not intended to limit the embodiments of the present application, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the embodiments of the present application are intended to be included within the scope of the embodiments of the present application.

Claims (10)

1. A display control method of a DMD, the method comprising:
acquiring a gray value of an image to be displayed, wherein the image to be displayed is a next frame of image of the current display image;
determining a first working temperature threshold of the DMD corresponding to the image to be displayed based on the gray value of the image to be displayed;
and if the current working temperature value of the DMD is higher than the first working temperature threshold value, controlling the working temperature value of the DMD to be reduced so that the working temperature value of the DMD in the process of displaying the image to be displayed is not higher than the first working temperature threshold value.
2. The method according to claim 1, wherein determining the first operating temperature threshold of the DMD corresponding to the image to be displayed based on the gray value of the image to be displayed comprises:
Acquiring a standard life value of the DMD;
determining a first micro mirror bearing duty ratio of the DMD when the image to be displayed is displayed based on the gray value of the image to be displayed;
the first operating temperature threshold is determined based on the first micromirror bearing duty cycle and the standard lifetime value.
3. The method of claim 2, wherein the determining the first operating temperature threshold based on the first micromirror-rest duty cycle and the standard lifetime value comprises:
acquiring a reference life value at a reference temperature;
acquiring a life acceleration factor corresponding to the bearing duty ratio of the reference micromirror;
and determining the first working temperature threshold based on the standard life value, the reference temperature, a life acceleration factor corresponding to the reference micromirror bearing duty cycle and the first micromirror bearing duty cycle.
4. The method of claim 3, wherein the determining the first operating temperature threshold based on the standard lifetime value, the reference temperature, a lifetime acceleration factor corresponding to the reference micromirror bearing duty cycle, and the first micromirror bearing duty cycle comprises:
Determining the first operating temperature threshold by the following formula;
wherein L is the standard lifetime value, L Tc For the reference lifetime value, Δe is a preset failure mechanism activation energy value, k is a boltzmann constant, P is a molecule in the first micromirror bearing duty cycle for characterizing a percentage of time that the micromirrors in the DMD bear against the light on state, M is a denominator in the first micromirror bearing duty cycle for characterizing the micromirrors in the DMDThe time percentage under the light off state is that beta is a life acceleration factor corresponding to the bearing duty ratio of the reference micro mirror, and T is that c For the reference temperature, T is i Is the first operating temperature threshold.
5. The method according to any one of claims 2-4, wherein determining a first micromirror bearing duty cycle of the DMD when displaying the image to be displayed based on the gray value of the image to be displayed comprises:
determining the first micromirror bearing duty cycle based on the gray value of the image to be displayed by the following formula;
wherein the saidAnd bearing a duty ratio for the first micro mirror, wherein G is the gray value of the image to be displayed.
6. The method of claim 1, wherein said controlling the operating temperature value of the DMD to decrease comprises:
and sending a first control command to a heat radiating unit, wherein the heat radiating unit comprises a heat radiating fan for radiating the DMD, and the first control command is used for indicating to increase the rotating speed of the heat radiating fan so as to reduce the working temperature value of the DMD.
7. The method according to claim 1, wherein the method further comprises:
and if the current working temperature value of the DMD is not higher than the first working temperature threshold value, maintaining the working temperature value of the DMD to be not higher than the first working temperature threshold value.
8. The method according to claim 1, wherein the acquiring the gray value of the image to be displayed comprises:
acquiring red, green and blue RGB gray values of each pixel point in the image to be displayed;
determining the gray value of each pixel point based on the RGB gray value of each pixel point in the image to be displayed;
and determining the gray value of the image to be displayed based on the gray value of each pixel point in the image to be displayed.
9. The method of claim 8, wherein determining the gray value of each pixel in the image to be displayed based on the RGB gray value of the corresponding pixel comprises:
Determining an initial gray value of a first pixel point based on a primary color percentage corresponding to an R gray value, a G gray value and a B gray value in RGB values of the first pixel point and the RGB gray value of the first pixel point, wherein the first pixel point is any pixel point in the image to be displayed;
and gamma correction is carried out on the initial gray value of the first pixel point, so that the gray value of the first pixel point is obtained.
10. A display control device of a DMD, the device comprising:
the acquisition module is used for acquiring the gray value of an image to be displayed, wherein the image to be displayed is the next frame of image of the current display image;
the determining module is used for determining a first working temperature threshold value of the DMD corresponding to the image to be displayed based on the gray value of the image to be displayed;
and the control module is used for controlling the working temperature value of the DMD to be reduced if the current working temperature value of the DMD is higher than the first working temperature threshold value, so that the working temperature value of the DMD in the process of displaying the image to be displayed is not higher than the first working temperature threshold value.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017090823A (en) * 2015-11-16 2017-05-25 株式会社リコー Image projection device
CN112563866A (en) * 2020-12-14 2021-03-26 四川长虹电器股份有限公司 System and method for prolonging service life of digital micromirror device of laser projector
CN113885605A (en) * 2021-09-30 2022-01-04 深圳市火乐科技发展有限公司 Temperature control method, related device and storage medium
CN114339176A (en) * 2021-12-22 2022-04-12 青岛海信激光显示股份有限公司 Projection image display method, laser projection apparatus, and readable storage medium
CN114339177A (en) * 2021-12-22 2022-04-12 青岛海信激光显示股份有限公司 Projection image display method, laser projection apparatus, and readable storage medium

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201622220D0 (en) * 2016-12-23 2017-02-08 Barco Nv Cooling system for spatial light modulating devices

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017090823A (en) * 2015-11-16 2017-05-25 株式会社リコー Image projection device
CN112563866A (en) * 2020-12-14 2021-03-26 四川长虹电器股份有限公司 System and method for prolonging service life of digital micromirror device of laser projector
CN113885605A (en) * 2021-09-30 2022-01-04 深圳市火乐科技发展有限公司 Temperature control method, related device and storage medium
CN114339176A (en) * 2021-12-22 2022-04-12 青岛海信激光显示股份有限公司 Projection image display method, laser projection apparatus, and readable storage medium
CN114339177A (en) * 2021-12-22 2022-04-12 青岛海信激光显示股份有限公司 Projection image display method, laser projection apparatus, and readable storage medium

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