CN114900674A - Display control method and device of DMD and storage medium - Google Patents
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- 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]
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- H04N9/12—Picture reproducers
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- H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits
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Abstract
The embodiment of the application discloses a display control method and device of a DMD (digital micromirror device) and a storage medium, 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, and the gray value of the image is positively correlated with the micro-mirror leaning duty ratio, so that the adverse effect of the micro-mirror leaning duty ratio and the working temperature value on the service life of the DMD when each frame of image is displayed can be reduced by the scheme, and the service life of the DMD is prolonged.
Description
Technical Field
The present disclosure relates to the field of image display, and more particularly, to a display control method and apparatus for a DMD, and a storage medium.
Background
A Digital Micromirror Device (DMD) is one of the main devices of a projection system. The DMD includes a plurality of micromirrors, each micromirror corresponding to a pixel point. The gray value of each pixel point in the displayed image is controlled by controlling the on or off state of each micromirror in the time length for displaying one frame of image and the time length for being on or off, so that the image is displayed. Wherein, when controlling the operation of the DMD, if the control is not proper, the service life of the DMD may be shortened. Accordingly, it is desirable to provide a method for display control of a DMD to improve the lifetime of the DMD.
Disclosure of Invention
The embodiment of the application provides a display control method and device of a DMD and a storage medium, and the service life of the DMD can be prolonged. The technical scheme is as follows:
in one aspect, a display control method for a DMD is provided, the method comprising:
acquiring a gray value of an image to be displayed, wherein the image to be displayed is a next frame image of a currently displayed 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 as to enable the working temperature value of the DMD in the process of displaying the image to be displayed to be not higher than the first working temperature threshold value.
Optionally, the determining a first operating temperature threshold of the DMD corresponding to the image to be displayed based on the gray-scale value of the image to be displayed includes:
acquiring a standard life value of the DMD;
determining the duty ratio of the first micro mirror of the DMD when the image to be displayed is displayed based on the gray value of the image to be displayed;
determining the first operating temperature threshold based on the first micro-mirror bearing duty cycle and the standard life time value.
Optionally, the determining the first operating temperature threshold based on the first micromirror seating 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 duty ratio of the reference micro-mirror bearing;
and determining the first working temperature threshold value based on the standard life value, the reference temperature, a life acceleration factor corresponding to the reference micro-mirror leaning duty ratio and the first micro-mirror leaning duty ratio.
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 seating duty cycle, and the first micromirror seating duty cycle includes:
determining the first operating temperature threshold by the following equation;
wherein L is the standard life value, the
For the reference lifetime value, Δ E is a preset failure mechanism activation energy value, k is a boltzmann constant, P is a numerator of the duty cycle of the first micromirror bearing for characterizing a time percentage of the micromirror bearing in the DMD in the light on state, M is a denominator of the duty cycle of the first micromirror bearing for characterizing a time percentage of the micromirror bearing in the DMD in the light off state, β is a lifetime acceleration factor corresponding to the duty cycle of the reference micromirror bearing, and T is a maximum value c Is the reference temperature, the T i Is the first operating temperature threshold.
Optionally, the determining, based on the gray-scale value of the image to be displayed, a duty ratio of the first micromirror of the DMD when the image to be displayed is displayed includes:
determining the duty ratio of the first micro-mirror bearing based on the gray value of the image to be displayed through the following formula;
wherein, the
And G is the gray value of the image to be displayed.
Optionally, the controlling the operating temperature value of the DMD to be decreased includes:
and sending a first control command to a heat dissipation unit, wherein 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 so as to reduce the working temperature value of the DMD.
Optionally, the method further comprises:
if the current working temperature value of the DMD is not higher than the first working temperature threshold value, the working temperature value of the DMD is maintained to be not higher than the first working temperature threshold value.
Optionally, the acquiring a gray scale value of an image to be displayed includes:
acquiring a red, green and blue (RGB) gray value of each pixel point in the image to be displayed;
determining the gray value of a corresponding 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 the corresponding 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 primary color percentages respectively 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 one pixel point in the image to be displayed;
and carrying out gamma correction on the initial gray value of the first pixel point to obtain the gray value of the first pixel point.
In another aspect, there is provided a display control apparatus of a DMD, the apparatus including:
the device comprises an acquisition module, a display module and a display module, wherein the acquisition module is used for acquiring the gray value of an image to be displayed, and the image to be displayed is the next frame image of the currently displayed image;
the determining module is used for 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 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 the duty ratio of the first micro mirror of the DMD when the image to be displayed is displayed based on the gray value of the image to be displayed;
determining the first operating temperature threshold based on the first micro-mirror bearing duty cycle and the standard life time 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 duty ratio of the reference micro-mirror bearing;
and determining the first working temperature threshold value based on the standard life value, the reference temperature, a life acceleration factor corresponding to the reference micro-mirror leaning duty ratio and the first micro-mirror leaning duty ratio.
Optionally, the determining module is mainly configured to:
determining the first operating temperature threshold by the following equation;
wherein L is the standard life value, the
Is said referenceThe method comprises the steps of obtaining a life value, wherein delta E is a preset failure mechanism activation energy value, k is a Boltzmann constant, P is a numerator in a duty ratio of bearing and leaning on the first micromirror and is used for representing the time percentage of the micromirror in the DMD when the micromirror bears on the light in an open state, M is a denominator in the duty ratio of bearing and leaning on the first micromirror and is used for representing the time percentage of the micromirror in the DMD when the micromirror bears on the light in a closed state, beta is a life acceleration factor corresponding to the duty ratio of bearing and leaning on the reference micromirror, and T is a time constant c Is the reference temperature, the T i Is the first operating temperature threshold.
Optionally, the determining module is mainly configured to:
determining the duty ratio of the first micro-mirror bearing based on the gray value of the image to be displayed through the following formula;
wherein, the
And 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 dissipation unit, wherein 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 so as to reduce the working temperature value of the DMD.
Optionally, the apparatus is further configured to:
if the current working temperature value of the DMD is not higher than the first working temperature threshold value, the working temperature value of the DMD is maintained to be not higher than the first working temperature threshold value.
Optionally, the obtaining module is mainly configured to:
acquiring a red, green and blue (RGB) gray value of each pixel point in the image to be displayed;
determining the gray value of a corresponding 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 obtaining module is mainly configured to:
determining an initial gray value of a first pixel point based on primary color percentages respectively 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 one pixel point in the image to be displayed;
and carrying out gamma correction on the initial gray value of the first pixel point to obtain the gray value of the first pixel point.
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;
the processor executes the executable instructions in the memory to execute the display control method of the DMD.
In another aspect, a computer-readable storage medium is provided, in which a computer program is stored, and the computer program realizes the steps of the display control method for a DMD described above when executed by a computer.
In another aspect, a computer program product containing instructions is provided, which when run on a computer, causes the computer to perform the steps of the display control method of the DMD described above.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
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, and the gray value of the image is positively correlated with the micro-mirror leaning duty ratio, so that the adverse effect of the micro-mirror leaning duty ratio and the working temperature value on the service life of the DMD when each frame of image is displayed can be reduced by the scheme, and the service life of the DMD is prolonged.
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 system architecture diagram related to a display control method for a DMD according to an embodiment of the present disclosure;
fig. 2 is a system architecture diagram according to another display control method for a DMD according to an embodiment of the present application;
fig. 3 is a flowchart of a display control method for a DMD according to an embodiment of the present application;
fig. 4 is a view illustrating DMD lifetime values corresponding to different operating temperature values and micromirror leaning duty ratios when 65 ℃ is used as a reference temperature, 10000 hours is used as a reference lifetime value, and 5/95 is used as a reference micromirror leaning duty ratio according to an embodiment of the present application;
FIG. 5 is a graph illustrating the effect of duty cycle and operating temperature on the life span of a DMD for a micro-mirror according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a display control device of a DMD according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, the following detailed description of the embodiments of the present application will be made with reference to the accompanying drawings.
Before explaining the embodiments of the present application in detail, a system architecture related to the embodiments of the present application will be described.
Fig. 1 is a system architecture diagram according to a display control method for a DMD according to an embodiment of the present disclosure. 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 obtain a next frame image of the currently displayed 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 the gray value of the image to be displayed, where the first operating temperature threshold is a maximum allowable operating temperature of the DMD when the image to be displayed is displayed. After determining the first operating temperature threshold, the control device 101 controls the operating temperature value of the DMD102 in the process of subsequently displaying the image to be displayed based on the first operating temperature threshold.
Illustratively, referring to fig. 2, the control device 101 may include a processing Unit 1011 and an MCU1012(Microcontroller Unit). The processing unit 1011 is configured to acquire an image signal, and decode the image signal to obtain an image to be displayed. Illustratively, 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 scale value of the image to be displayed, further determine a duty ratio of a first micromirror of the DMD102 when the image to be displayed is displayed based on the gray scale 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 duty ratio of the first micromirror, and send the first operating temperature threshold to the MCU 1012. After the first operating temperature threshold is determined, the processing unit 1011 may further load data to the DMD102 based on the gray-scale value of each pixel point in the image to be displayed, and further control the DMD102 to perform light modulation based on the loaded data, so as to display the image to be displayed.
It should be noted that, in the process of displaying the image, the temperature detection unit 103 may detect the internal operating temperature value of the DMD102 in real time. When the operating temperature value of the DMD102 is detected, the temperature detecting unit 103 may report the detected operating temperature value of the DMD102 to the control device 101 in real time. Based on this, in the process of displaying the current image, after the control device 101 determines the first operating temperature threshold, the heat dissipation unit 104 may be controlled to dissipate heat for 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 displaying the image to be displayed subsequently is not higher than the first operating temperature threshold.
Wherein, DMD102 and temperature detecting element 103 are all installed on the DMD board, and this temperature detecting element 103 is connected with DMD102 to measure DMD 102's internal operating temperature value, this measuring method is more accurate, and the precision is higher. The temperature detecting unit 103 may be a temperature measuring control circuit.
In addition, referring to fig. 2, the heat dissipating unit 104 may include a heat dissipating fan 1041 and a heat sink 1042. Wherein, heat dissipation fan 1041 faces DMD102, and heat sink 1042 contacts DMD 102. Both the heat dissipation fan 1041 and the heat dissipation device 1042 are used for dissipating heat of the DMD102, and in addition, the heat dissipation fan 1041 may also be used for dissipating heat of the heat dissipation device 1042. On this basis, after the MCU1012 receives the current operating temperature value of the DMD102 reported by the temperature detection unit 103 in 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 dissipation unit 104 to instruct the heat dissipation unit 104 to control the increase of the rotation speed of the heat dissipation fan 1041, so as to improve the heat dissipation effect, thereby reducing the operating temperature value of the DMD102, so that the operating temperature value of the DMD in the subsequent process of displaying the image to be displayed is not higher than the first operating temperature threshold.
Next, a display control method of the DMD provided in the embodiment of the present application will be described.
Fig. 3 is a flowchart of a display control method for a DMD according to an embodiment of the present disclosure. The method can be applied to the control device 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 an image of a frame next to an 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 implementation manners, the image to be displayed may also be a static frame of 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 point in the image to be displayed, and determine a gray value of a corresponding 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.
Exemplarily, an implementation process of determining a gray value of a pixel is described by taking any pixel in an image to be displayed as an example, and for convenience of description, the pixel is referred to as a first pixel. The control device may obtain a primary color percentage corresponding to an R gray value, a primary color percentage corresponding to a G gray value, and a primary color percentage corresponding to a B gray value in the RGB gray values of the first pixel point. And then, 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, i.e., red, green and blue, i.e., the RGB gray scale values of each pixel point include an R gray scale value, a G gray scale value and a B gray scale value. In order to reach the white balance point in the display process of one frame of image, the three primary color display time has respective percentages in the display period, and the ratio sum of the three primary color display time is 100%. Based on this, the control apparatus 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. The red percentage is used as the primary color percentage corresponding to the R gray value in the first pixel point, the green percentage is used as the primary color percentage corresponding to the G gray value in the first pixel point, and the blue percentage is used as the primary color percentage corresponding to the B gray value in the first pixel point.
After primary color percentages corresponding to the R gray value, the G gray value and the B gray value in the RGB gray values of the first pixel point are obtained, the control device may calculate the initial gray value of the first pixel point by using the following formula 1.
G 0 ＝G R *p R +G G *p G +G B *p B (1)
Wherein, G 0 Is the initial gray value of the first pixel point, G R Is the R gray value, p R As a percentage of the base color corresponding to the R gray value, G G Is a G gray value, p G Is the primary color percentage corresponding to the gray value of G, G B Is the B gray value, p B Is the percentage of the primary color corresponding to the B gray value.
For example, if the red percentage of the image to be displayed satisfies the white balance condition is 50%, the green percentage is 20%, the blue percentage is 30%, the R gray value of the first pixel point is 40%, the G gray value is 100%, and the B gray value is 0, the initial gray value of the first pixel point can be determined to be 40% by the above formula 1.
After the initial gray value of the first pixel point is determined, since the perception of human eyes to brightness is not in direct proportion to the optical power, the control device can also perform gamma correction on the initial gray value of the first pixel point, so as to obtain the gray value of the first pixel point. The control device may correct the initial gray value of the first pixel point according to the following formula 2.
G＝AG 0 Gamma (2)
Wherein G is a gray value of the first pixel point, a is a preset scaling factor, a value of the scaling factor is 1, and Gamma is a preset power exponent, and a value of the scaling factor may be 2.2.
For example, if the initial gray-level value of the first pixel point is 40%, the gray-level value of the first pixel point obtained after the initial gray-level value is corrected 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 by the method. Then, 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 gray values of the pixel points in the image to be displayed, and use the average value as the gray value of the image to be displayed. Or, the control device may also obtain a mode of the gray values of the pixel points in the image to be displayed as the gray value of the image to be displayed. Of course, the control device may also count the gray scale value of the pixel point in the image to be displayed by using other statistical methods, so as to determine the gray scale 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 a possible implementation manner, the control device obtains a standard life value of the DMD, and determines a duty ratio of the first micromirror bearing when the DMD displays 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 micro-mirror bearing duty cycle and the standard lifetime value.
The standard life value of the DMD may refer to a specified life value of the DMD, for example, a specified life value of the model DMD provided by a manufacturer when the DMD leaves a factory. In the embodiment of the present application, a mapping relationship between DMDs of different models and corresponding standard life values may be preset in the control device. Based on this, the control device may obtain the corresponding standard life value from the mapping relationship according to the model of the DMD. Alternatively, the mapping relationship may be stored in other devices, so that the control device may obtain the standard life value of the DMD from the other devices according to the model of the DMD. Or, since the control device may directly store the standard life value of the DMD if the control device and the DMD are provided by the same service provider, the control device may directly obtain the stored standard life value of the DMD.
In addition, the control device can also determine the duty ratio of the first micromirror of the DMD when displaying the image to be displayed based on the gray value of the image to be displayed. The duty ratio of the first micromirror is used for representing the percentage of the duration of the micromirror in the DMD in the light-on state and the duration of the micromirror in the light-off state in the process of displaying the image to be displayed.
It should be noted that each pixel point in one frame image corresponds to one micromirror in the DMD. When a frame of image is displayed, the DMD may control the corresponding micromirrors to turn over based on the gray-scale value of the pixel point corresponding to each micromirror, so as to switch the micromirrors between an on state and an off state, and control the duration of the micromirrors in different states, thus realizing the gray-scale value presentation of the pixel point corresponding to the corresponding micromirror by accumulating the power of the light beam reflected to the projection lens by each micromirror in the on state. However, when the micromirror works in a certain state for a long time, when the micromirror is controlled to turn, the micromirror may have a small residual tilt angle, so that the micromirror cannot be effectively turned to another state, and further the micromirror has an abnormal function, and cannot correctly display corresponding pixels. In other words, the greater the time-to-time ratio of the two different states of the micromirror, the more likely the micromirror will fail, thereby resulting in a shorter lifetime of the DMD. Since the proportion of the time length of the micromirror in different states is the micromirror leaning duty ratio, it can be known that the larger the absolute value of the difference between the numerator and the denominator of the micromirror leaning duty ratio is, the more unbalanced the time lengths of the micromirror in the light-on state and the light-off state are, the larger the influence on the service life of the DMD is. According to the principle that the micromirror in the DMD displays the pixel points, the accumulated power reflected to the projection lens is different when the micromirror is in the light-on state for different time lengths, and the gray scale value displayed finally is different. That is, the time duration of the micromirror in different states is mainly determined by the gray value of the pixel point corresponding to the micromirror. Based on this, in this embodiment of the present application, the control device may determine, based on the gray-scale value of the image to be displayed, a duty ratio that the first micromirror of the DMD bears during displaying the image to be displayed, so as to represent a time ratio of the micromirrors of the DMD in the light-on state and the light-off state during displaying the image to be displayed.
For example, the control device may determine the duty ratio of the first micromirror bearing by the following formula 3 based on the gray value of the image to be displayed.
Wherein the content of the first and second substances,
the duty ratio is supported by the first micromirror, and G is the gray scale value of the image to be displayed.
For example, assuming that the gray-scale value of the image to be displayed is 40%, the duty ratio of the first micromirror is 40: 60.
After determining that the first micromirror bears on the duty ratio, the control device may acquire a reference life value at a reference temperature; acquiring a life acceleration factor corresponding to the duty ratio of the reference micro-mirror bearing; a first operating temperature threshold is determined based on the standard lifetime value, the reference temperature, the reference micromirror seating duty cycle, the corresponding lifetime acceleration factor, and the first micromirror seating duty cycle.
And the reference temperature and the reference life value at the reference temperature are preset. For example, the reference temperature and the reference lifetime value may be provided by a manufacturer of the DMD, in which case the control device may retrieve the reference temperature and the corresponding reference lifetime value from the product data of the DMD. Alternatively, the reference temperature and the reference life value may be set by a user, in which case the reference life value may be determined according to a test life value obtained by testing a plurality of DMD test samples whose operating temperatures are maintained at the reference temperature. That is, a plurality of DMD test samples of the same type as the DMD may be controlled to operate at a reference temperature to obtain test lifetime values of the test samples of the plurality of DMDs, and then, the reference lifetime value may be determined based on the test lifetime values of the plurality of test samples. For example, an average value of the plurality of test lifetime values is used as the reference lifetime value, or a mode of the plurality of test lifetime values is used 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 the denominator of the duty ratio by which the micromirror bears, the more serious the adverse effect on the DMD, that is, the more likely the lifetime of the DMD is shortened. Therefore, for a certain operating temperature, the lifetime of the DMD when the duty ratio of the micromirror is 100:0 or 0:100 is the minimum lifetime value of the DMD at the operating temperature. However, since the duty ratio of the micro mirror bearing is 100:0 or 0:100 in practical applications, it is rare that 5:95 and 95:5 are used as reference micro mirror bearing duty ratios in the embodiments of the present application. Of course, other values can be used as reference micromirrors to bear on the duty ratio, which is not limited in the embodiments of the present application.
After determining the reference micromirror seating duty ratio, the control device may determine a lifetime acceleration factor corresponding to the reference micromirror seating duty ratio by the following formula 4 based on the reference micromirror seating duty ratio.
Wherein, beta is the life time acceleration factor corresponding to the duty ratio of the reference micromirror bearing, P c For reference the molecules in the duty cycle of the micromirror, M c The reference micromirror bears against the denominator in the 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 seating duty ratio, the corresponding lifetime acceleration factor, and the first micromirror seating duty ratio, 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 Is a reference temperature, L Tc Is a reference life value.And delta E is a preset failure mechanism activation energy value, k is a Boltzmann constant, P is a numerator of the duty ratio of the first micromirror bearing, M is a denominator of the duty ratio of the first micromirror bearing, and beta is a life acceleration factor corresponding to the duty ratio of the reference micromirror bearing. When β is 100/90, the following equation 6 can be obtained from the above equation 5.
As can be seen from the above equations 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 in the process of displaying the image to be displayed, that is, under the condition that the duty ratio of the micromirror bearing of the DMD is the duty ratio of the first micromirror bearing.
It should be noted that Δ E in the above equations 5 and 6 can be provided by the manufacturer of the DMD. Alternatively, the determination may be made based on test data obtained by testing a plurality of DMD test samples.
For example, when determining Δ E through the test data, the DMD test samples may be divided into at least two sample groups, each sample group includes a plurality of test samples, and each sample group corresponds to a 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 description, the sample group whose corresponding test temperature is the reference temperature is referred to as the reference sample group. And for each sample group, controlling the working temperature of the DMD test sample 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. And then, determining the test life value of each DMD test sample in the sample group at the corresponding test temperature based on the test life value of the sample group. For example, an average or a mode of the test lifetime values of the DMD test samples included in the sample group is determined as the test lifetime value at the test temperature corresponding to the sample group. By the method, the test life values corresponding to at least two test temperatures can be obtained. After thatSetting the service life acceleration factor of the DMD corresponding to the reference temperature to be 1, and dividing T by at least two test temperatures based on the test service life value corresponding to the reference temperature, the service life acceleration factor and the test temperature c Any temperature T other than i T is determined by the following equation 7 i Corresponding life acceleration factor.
Wherein, AF i For testing temperature T i Time-corresponding life acceleration factor, AF c For the test temperature as the reference temperature T c The corresponding life acceleration factor is equal to 1.
Is T i The corresponding value of the test life-time,
is T c Corresponding test life values.
In determining AF i After that, Δ E can be determined based on the following equations 8 and 9.
Where Q is the degradation rate of DMD at temperature T, A 0 Is constant, k is the boltzmann constant. On the basis of this, the method is suitable for the production,
for DMD at a temperature of T c The rate of degradation of the film is,
for DMD at a temperature of T i The degradation rate of (c).
Note that T is i Can be at least two test temperatures with T c The one at which the difference in (c) is the largest. Alternatively, in a possible implementation, the method may also be used to divide T by T in at least two test temperatures c And calculating corresponding delta E for each test temperature, and taking the average value of the delta E corresponding to each test temperature as final delta E. In addition, the temperatures in the above formulas 5 to 9 all refer to thermodynamic temperatures.
For example, suppose T c At 65 ℃ T i At a temperature of 25 c,
the reaction time is 10000 hours,
794512 hours, AF can be determined by the above equation 3 i Equal to 79.4512. Then, based on equation 5, it can be determined that Δ E is 0.95096 eV.
For example, based on the relationship between the temperature, the micromirror leaning duty ratio and the lifetime value given in the above equation 5, fig. 4 shows the corresponding lifetime values of the DMD at different operating temperatures and micromirror leaning duty ratios under the condition that the reference temperature is 65 degrees, the reference lifetime value is 10000 hours, and the reference micromirror leaning duty ratio is 5: 95.
Based on equation 5 and fig. 4 above, fig. 5 provides a graph of the effect of the duty cycle and operating temperature of the micromirror on the lifetime value of the DMD. As shown in fig. 5, with the horizontal axis representing the duty ratio of the micromirror bearing and the vertical axis representing the operating temperature of the DMD, the lifetime values of the DMD corresponding to any point on the curve are the same, that is, the curve in fig. 5 is a two-dimensional relationship curve formed by the points of different operating temperatures and the duty ratio of the micromirror bearing under the condition of the same lifetime values. As can be seen from fig. 5, under the same life value, the larger the difference between the numerator and the denominator of the duty ratio borne by the micromirror of the DMD is, the lower the corresponding maximum allowable operating temperature is, and conversely, the smaller the difference between the numerator and the denominator of the duty ratio borne by the micromirror is, the higher the corresponding maximum allowable operating temperature is. In other words, in the case where the micromirror has a large difference between the numerator and the denominator of the duty ratio, the DMD may be operated at a low operating temperature as appropriate in order to improve the lifetime of the DMD.
The foregoing is an implementation manner for determining the first operating temperature threshold of the DMD provided in the embodiment of the present application, and optionally, in another possible implementation manner, the control device may store the corresponding first operating temperature threshold of the DMD under different duty ratios of different micromirrors under different life values. Based on this, after determining the duty ratio of the first micromirror bearing, the control device may directly obtain the first operating temperature threshold corresponding to the duty ratio of the first micromirror bearing at the target life value.
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 as to enable the working temperature value of the DMD in the process of displaying the image to be displayed not to be higher than the first working temperature threshold value.
After determining the first operating temperature threshold of the DMD when displaying the image to be displayed through step 302, the control device may control the operating temperature of the DMD based on the first operating temperature threshold of the DMD, so that the DMD operates at a temperature lower than the first operating temperature threshold.
Exemplarily, the DMD is usually installed on a DMD board, and in this embodiment of the application, a temperature detection unit may also be installed on the DMD board, and the temperature detection unit is connected to the DMD, and may detect the internal operating temperature of the DMD in real time, and report the detected operating temperature to the control device. Based on this, in the embodiment of the present application, after the first operating temperature threshold is determined, the control device may receive the current operating temperature value of the DMD, which is reported by the temperature detection unit, and compare the current operating temperature value of the DMD with the first operating temperature threshold. If the current operating temperature value of the DMD is higher than the first operating temperature threshold, the control device may send a first control command to the heat dissipation unit. 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 can be seen from the foregoing description, the heat dissipation unit includes a heat dissipation fan and a heat sink in contact with the DMD. If the detected current working temperature value of the DMD is not less than the first working temperature threshold value, the control equipment can control the rotating speed of the heat dissipation fan to rise, and therefore, on one hand, the heat dissipation effect of the heat dissipation fan on the DMD can be enhanced directly, meanwhile, the heat dissipation effect of the heat dissipation fan on the heat dissipation device can be improved, the heat dissipation effect of the heat dissipation device on the DMD is improved, the working temperature of the DMD is reduced, and therefore the working temperature value of the DMD can be not higher than the first working temperature threshold value in the process of displaying the image to be displayed in the subsequent process.
Alternatively, if the present operating temperature value of the DMD is below the first operating temperature threshold, the control device may maintain the operating temperature value of the DMD not above the first operating temperature threshold.
Wherein, in case that 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 value between the first operating temperature threshold value and the current operating temperature of the DMD. And then, comparing the temperature difference with a reference threshold, and if the temperature difference is greater than the reference threshold, it indicates that the difference between the current operating temperature value and the first operating temperature threshold is large, and the current operating temperature value does not reach the first operating temperature threshold in a short time. Certainly, if the temperature difference is not greater than the reference threshold, it indicates 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 this case, as the operating time of the DMD is prolonged, heat is accumulated, and the operating temperature value of the DMD after the DMD starts to display the image to be displayed may exceed the first operating temperature threshold, therefore, the control device may appropriately increase the rotation speed of the heat dissipation fan to enhance the heat dissipation effect of the heat dissipation fan, thereby ensuring that the operating temperature value of the DMD after the DMD starts to display the image to be displayed can be lower than the first operating temperature threshold. It should be noted that, in this case, the control device may control the increase of the rotation speed of the cooling fan to be lower than that in the case where the aforementioned current operation temperature value is higher than the first operation temperature threshold value.
Optionally, in another possible implementation, the controller may determine a second operating temperature threshold in advance according to a first operating temperature threshold of the DMD, where the second operating temperature threshold is smaller than the first operating temperature threshold, for example, 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 value. If the current operating temperature value of the DMD is higher than the second operating temperature threshold value, the control device may send a first control command to the heat dissipation unit to increase the rotation speed of the heat dissipation fan, so as to prevent the operating temperature of the subsequent DMD from continuously rising beyond the first operating temperature threshold value. Optionally, if the current operating temperature value of the DMD is not higher than the second operating temperature threshold, the control device may obtain the operating temperature value of the DMD, which is received within a preset time period before the current time and reported by the temperature detection unit, and sequence the operating temperature values at each time including the current time according to a time sequence. 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 difference values are positive numbers and increase along with time, the operating temperature value of the DMD is accelerated to rise, at the moment, the control device can send a first control command to the heat dissipation unit to increase the rotating speed of the heat dissipation fan, so that the effect of intervention in advance is achieved, and the operating temperature value of the DMD is prevented from rapidly rising to the first operating temperature threshold value. If the at least two temperature differences are positive numbers and decrease with time, the increase rate of the operating temperature of the DMD is decreased, and at this time, the control device may not adjust the rotation speed of the heat dissipation fan. If the at least two temperature differences are negative numbers, the operating temperature of the DMD is always decreased, in which case the control device may not adjust the rotation speed of the heat dissipation fan, or the control device may send a second control command to the heat dissipation unit to decrease the rotation speed of the heat dissipation fan.
After the control device adjusts the rotating 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 may continue to receive the working temperature value of the DMD, which is detected and reported in real time by the temperature detection unit, and adjust the rotating speed of the cooling fan based on the real-time received working temperature value of the DMD and the first working temperature threshold value, by referring to the method described above, so as to control that the working temperature value of the DMD is not 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 by using the frame of image as an image to be displayed, so as to control the operating temperature value of the DMD during the process of displaying the frame of image to be not higher than the operating temperature threshold value of the DMD corresponding to the frame of image. Of course, in some possible implementation manners, the control device may also obtain a frame of image to be displayed at preset time intervals, determine an operating temperature threshold based on the image to be displayed, and then control the operating temperature value of the DMD within the preset time interval to not exceed the temperature threshold in the next preset time interval, that is, with the operating temperature threshold as a reference. Or, the control device may also acquire a frame of image to be displayed every N frames of images, determine an operating temperature threshold based on the image to be displayed, and then control the operating temperature value of the DMD not to exceed the temperature threshold during displaying the N +1 frames of images including the image to be displayed, that is, with the operating temperature threshold as a reference.
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 micro-mirror bearing duty ratio, the temperature and the life value of the DMD can be obtained by testing a plurality of DMD test samples, and then a first working temperature threshold corresponding to the micro-mirror 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 for a DMD provided in an embodiment of the present application.
Referring to fig. 6, an embodiment of the present application provides a display control device 600 for a DMD, where the device 600 includes:
an obtaining module 601, configured to obtain a gray value of an image to be displayed, where the image to be displayed is a next frame image of a currently displayed image;
a determining module 602, configured to determine, based on a gray value of an image to be displayed, a first operating temperature threshold of the DMD corresponding to the image to be displayed;
the control module 603 is configured to control the operating temperature value of the DMD to decrease if the current operating temperature value of the DMD is higher than the first operating temperature threshold, so that the operating temperature value of the DMD is not higher than the first operating temperature threshold in the process of displaying the image to be displayed.
Optionally, the determining module 602 is mainly configured to:
acquiring a standard life value of the DMD;
determining the duty ratio of the first micromirror of the DMD when the image to be displayed is displayed based on the gray value of the image to be displayed;
a first operating temperature threshold is determined based on the first micro-mirror bearing duty cycle and the standard lifetime value.
Optionally, 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 duty ratio of the reference micro-mirror bearing;
and determining a first working temperature threshold value based on the standard life value, the reference temperature, a life acceleration factor corresponding to the reference micro-mirror bearing duty ratio and the first micro-mirror bearing duty ratio.
Optionally, the determining module 602 is mainly configured to:
determining a first operating temperature threshold by the following equation;
wherein, L is a standard life value,
for a reference life value, Δ E is a preset failure mechanism activation energy value, k is a Boltzmann constant, P is a numerator in a first micromirror leaning duty ratio for representing a time percentage of the micromirror in the DMD leaning on the light-on state, M is a denominator in the first micromirror leaning duty ratio for representing the time percentage of the micromirror in the DMD leaning on the light-off state, β is a life acceleration factor corresponding to the reference micromirror leaning duty ratio, and T is a time difference between the reference micromirror leaning duty ratio and the light-off state c For reference temperature, T i Is a first operating temperature threshold.
Optionally, the determining module 602 is mainly configured to:
determining the duty ratio of the first micro-mirror bearing based on the gray value of the image to be displayed through the following formula;
wherein the content of the first and second substances,
the duty ratio is supported by the first micromirror, and G is the gray scale value of the image to be displayed.
Optionally, the control module 603 is mainly configured to:
and sending a first control command to a heat dissipation unit, wherein 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 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 greater than the first operating temperature threshold, the operating temperature value of the DMD is maintained to be not greater than the first operating temperature threshold.
Optionally, the obtaining module 601 is mainly configured to:
acquiring a red, green and blue (RGB) gray value 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.
Optionally, the obtaining module 601 is mainly configured to:
determining an initial gray value of a first pixel point based on the primary color percentages respectively corresponding to the R gray value, the G gray value and the B gray value in the RGB values of the first pixel point and the RGB gray value of the first pixel point, wherein the first pixel point is any one pixel point in the image to be displayed;
and carrying out gamma correction on the initial gray value of the first pixel point to obtain the gray value of the first pixel point.
In summary, in the embodiment of the present application, different temperature thresholds are determined according to gray-scale values of different images, and then the operating temperature value of the DMD is adjusted in real time based on the different temperature thresholds, so that the operating temperature value of the DMD during displaying different images can be lower than the operating temperature threshold corresponding to the corresponding image.
It should be noted that, when the display control device for a DMD provided in the above embodiment controls the DMD to realize image display, the division of the above functional modules is merely used as an example, and in practical applications, the above functions may be distributed to different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions. In addition, the embodiments of the display control method for the display control device for the DMD provided by the above embodiments belong to the same concept, and specific implementation processes thereof are described in the embodiments of the method for the display control device for the DMD, which are not described herein again.
Embodiments of the present application also provide a computer-readable storage medium, and when instructions in the storage medium are executed by a processor, the storage medium enables the display control method for a DMD provided in the above embodiments to be performed. For example, the computer readable storage medium may be a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like. It is noted that the computer-readable storage medium referred to in the embodiments of the present application may be a non-volatile storage medium, in other words, a non-transitory storage medium.
It should be understood that all or part of the steps for implementing the above 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 which, when run on a computer, cause the computer to execute the display control method of the DMD provided by the above embodiments.
The above description should not be taken as limiting the embodiments of the present application, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the embodiments of the present application should be included in the scope of the embodiments of the present application.
Claims (10)
1. A display control method for 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 image of a currently displayed 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 as to enable the working temperature value of the DMD in the process of displaying the image to be displayed to be not higher than the first working temperature threshold value.
2. The method according to claim 1, wherein the determining a first operating temperature threshold of the DMD corresponding to the image to be displayed based on the gray-level value of the image to be displayed comprises:
acquiring a standard life value of the DMD;
determining the duty ratio of the first micro mirror of the DMD when the image to be displayed is displayed based on the gray value of the image to be displayed;
determining the first operating temperature threshold based on the first micro-mirror bearing duty cycle and the standard life time value.
3. The method of claim 2, wherein determining the first operating temperature threshold based on the first micro-mirror seating duty cycle and the standard life time value comprises:
acquiring a reference life value at a reference temperature;
acquiring a life acceleration factor corresponding to the duty ratio of the reference micro-mirror bearing;
and determining the first working temperature threshold value based on the standard life value, the reference temperature, a life acceleration factor corresponding to the reference micro-mirror bearing duty ratio and the first micro-mirror bearing duty ratio.
4. The method of claim 3, wherein determining the first operating temperature threshold based on the standard lifetime value, the reference temperature, a lifetime acceleration factor corresponding to the reference micromirror seating duty cycle, and the first micromirror seating duty cycle comprises:
determining the first operating temperature threshold by the following equation;
wherein L is the standard life value, L Tc For the reference lifetime value, Δ E is a preset failure mechanism activation energy value, k is a boltzmann constant, P is a numerator of the duty cycle of the first micromirror bearing for characterizing a time percentage of the micromirror bearing in the DMD in the light on state, M is a denominator of the duty cycle of the first micromirror bearing for characterizing a time percentage of the micromirror bearing in the DMD in the light off state, β is a lifetime acceleration factor corresponding to the duty cycle of the reference micromirror bearing, and T is a maximum value c Is the reference temperature, the T i Is the first operating temperature threshold.
5. The method according to any one of claims 2-4, wherein the determining the duty cycle of the DMD for the first micromirror to bear when displaying the image to be displayed based on the gray-level value of the image to be displayed comprises:
determining the bearing duty ratio of the first micromirror according to the following formula based on the gray value of the image to be displayed;
wherein, the
And G is the gray value of the image to be displayed.
6. The method according to claim 1, wherein controlling the operating temperature value of the DMD to decrease comprises:
and sending a first control command to a heat dissipation unit, wherein 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 so as to reduce the working temperature value of the DMD.
7. The method of claim 1, further comprising:
if the current working temperature value of the DMD is not higher than the first working temperature threshold value, the working temperature value of the DMD is maintained to be not higher than the first working temperature threshold value.
8. The method according to claim 1, wherein the obtaining the gray-scale value of the image to be displayed comprises:
acquiring a red, green and blue (RGB) gray value of each pixel point in the image to be displayed;
determining the gray value of a corresponding 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 scale value of each pixel point based on the RGB gray scale values of the pixel points in the image to be displayed comprises:
determining an initial gray value of a first pixel point based on primary color percentages respectively 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 one pixel point in the image to be displayed;
and carrying out gamma correction on the initial gray value of the first pixel point to obtain the gray value of the first pixel point.
10. A display control apparatus of a DMD, the apparatus comprising:
the device comprises an acquisition module, a display module and a display module, wherein the acquisition module is used for acquiring the gray value of an image to be displayed, and the image to be displayed is the next frame image of the currently displayed image;
the determining module is used for 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 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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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023202330A1 (en) * | 2022-04-20 | 2023-10-26 | 青岛海信激光显示股份有限公司 | Laser projection display method and laser projection display apparatus |
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