CN111240144A - Method for realizing digital micro-reflector driving control in projection imaging - Google Patents
Method for realizing digital micro-reflector driving control in projection imaging Download PDFInfo
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- CN111240144A CN111240144A CN201811444375.1A CN201811444375A CN111240144A CN 111240144 A CN111240144 A CN 111240144A CN 201811444375 A CN201811444375 A CN 201811444375A CN 111240144 A CN111240144 A CN 111240144A
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- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
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Abstract
The application relates to a method for realizing drive control of a digital micro-reflector in projection imaging, which comprises the following steps: in the projection display of each frame image through the digital micro-reflector plate, selecting a specified time period according to the primary color display time of the projected pixel; and in the appointed time period, the digital micro-reflector plate is driven and controlled to deflect positively and negatively according to preset times. The method provided by the application can be used for realizing the anti-aging of the rotating device in the digital micromirror device.
Description
Technical Field
The application relates to the technical field of image projection, in particular to a method for realizing drive control of a digital micro-reflector in projection imaging.
Background
The Digital Micromirror Device (DMD) is a core Device in a DLP (Digital light processing) projector, on which a plurality of Digital micromirror plates are integrated, and when the DLP projector is performing image projection, each Digital micromirror plate is a pixel point, and the incident light is reflected by controlling each Digital micromirror plate to deflect a certain angle in the positive and negative directions, so that the reflected light is displayed and imaged on a projection screen through a projection lens.
The adjustment of the deflection direction of the digital micro-reflector plate is realized by a rotating device which is arranged below the digital micro-reflector plate and acts like a hinge, and as the rotating device is of a mechanical structure, the mechanical property of the rotating device is aged due to the long-time deflection towards a certain direction, and finally the mechanical structure is invalid, so that the service life of the whole DLP projector is directly influenced.
Therefore, how to avoid the mechanical performance aging of the rotating device arranged in the digital micromirror device in the process of projection display is a technical problem to be solved in the prior art.
Disclosure of Invention
Based on the above technical problem, the present application provides a method and an apparatus for implementing digital micromirror drive control in projection imaging, a projection device, and a computer-readable storage medium.
Wherein, the technical scheme who this application adopted does:
a method for realizing drive control of a digital micro-reflector in projection imaging comprises the following steps: in the projection display of each frame image through the digital micro-reflector plate, selecting a specified time period according to the primary color display time of the projected pixel; and in the appointed time period, the digital micro-reflector plate is driven and controlled to deflect positively and negatively according to preset times.
Further, in the projection display of each frame image by the digital micro-mirror plate, selecting a specified time period according to the primary color display time of the projected pixel includes: acquiring the primary color display time of each primary color on a projected pixel of the digital micro-reflector plate; acquiring a target primary color meeting the time length corresponding to the specified time period from each primary color on the projected pixel according to the acquired primary color display time; the specified time period is selected from the primary display times of the target primaries.
Further, the acquiring, according to the acquired display time of the primary colors, a target primary color that satisfies a time length corresponding to the specified time period from each primary color on the projected pixel includes: and if the primary color display time of the single primary color is acquired, the time for the digital micro-mirror plate to deflect in the forward direction in the specified time period is met, and the single primary color is selected as the target primary color.
Further, if the primary color display time of the single primary color is obtained and the time for the digital micro-mirror plate to perform forward deflection in the specified time period is satisfied, selecting the single primary color as the target primary color comprises: if the primary color display time of the preset primary color is obtained, the time of the digital micro-reflector plate for carrying out forward deflection in the specified time period is met, and the preset primary color is selected as the target primary color; otherwise, selecting one primary color from other primary colors on the projected pixel as the target primary color, wherein the primary color display time of the target primary color meets the time for the digital micro-mirror plate to perform forward deflection in the specified time period.
Further, the acquiring, according to the acquired display time of the primary colors, a target primary color that satisfies a time length corresponding to the specified time period from each primary color on the projected pixel includes: and if the primary color display time of the single primary color is acquired, the time for the digital micro-mirror plate to perform positive deflection in the specified time period is met, and the time for the digital micro-mirror plate to perform negative deflection in the specified time period is met, selecting the single primary color as the target primary color.
Further, the selecting the specified time period from the primary color display time of the target primary color includes: and selecting a continuous time from the primary color display time of the single primary color as the specified time period, wherein the continuous time is the same as the time length corresponding to the specified time period.
Further, the driving and controlling the digital micromirror plate to perform periodic positive and negative deflection motions in the specified time period includes: and in the process of carrying out projection display on the single primary color by the digital micro-reflector, the digital micro-reflector is driven and controlled to carry out positive and negative deflection according to preset times in the specified time period.
Further, the acquiring, according to the acquired display time of the primary colors, a target primary color that satisfies a time length corresponding to the specified time period from each primary color on the projected pixel includes: and if the acquired primary color display time of each primary color does not meet the time for the digital micro-mirror plate to perform positive deflection in the specified time period or the time for the digital micro-mirror plate to perform negative deflection in the specified time period, selecting each primary color on the projected pixel as the target primary color.
Further, the selecting the specified time period from the display time of the primary color corresponding to the target primary color includes: and respectively selecting sub-time periods from the display time of each primary color according to the primary colors on the projected pixels, wherein the sum of the time lengths corresponding to the sub-time periods is the time length corresponding to the specified time period.
Further, the driving and controlling the digital micromirror plate to perform periodic positive and negative deflection motions in the specified time period includes: and in the process that the digital micro-reflector respectively performs projection display on each primary color on the projected pixels, the digital micro-reflector is driven and controlled to respectively perform positive and negative deflection within each sub-time period according to preset times.
An apparatus for implementing digital micromirror plate driving control in projection imaging, the apparatus comprising: the specified time period selection module is used for selecting a specified time period according to the primary color display time of the projected pixel in the projection display process of each frame image through the digital micro-reflector plate; and the driving control module is used for driving and controlling the digital micro-reflector plate to deflect positively and negatively according to preset times in the appointed time period.
A projection device comprising a processor and a memory, the memory having stored thereon computer readable instructions which, when executed by the processor, implement a method as described above.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method as set forth above.
In the technical scheme, the appointed time period is selected in the projection display process of each frame image of the digital micro-reflector plate, and the corresponding digital micro-reflector plate is driven and controlled to deflect positively and negatively according to the preset times in the appointed time, so that the digital micro-reflector plate is prevented from deflecting towards a certain direction for a long time, and the anti-aging of the rotating device corresponding to the digital micro-reflector plate is realized.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
FIG. 1 is a schematic illustration of an implementation environment in accordance with the subject application;
FIG. 2 is a schematic diagram of a DLP projector in an exemplary embodiment in the implementation environment of FIG. 1;
FIG. 3 is a timing diagram illustrating the driving control of digital micromirror plates by image display driving signals according to an exemplary embodiment;
FIG. 4 is a flow diagram illustrating a method of implementing digital micromirror plate drive control in projection imaging according to an exemplary embodiment;
FIG. 5 is a flow diagram for one embodiment of step 310 in a corresponding embodiment of FIG. 4;
fig. 6 is a timing diagram illustrating drive control of digital micromirror plates by image display driving signals according to another exemplary embodiment;
FIG. 7 is a timing diagram illustrating an exemplary embodiment of the timing of the image display driving signals of FIG. 6 after adding a specified period of time to the timing;
FIG. 8 is a timing diagram illustrating another exemplary embodiment after adding a specified period of time to the timing of the image display driving signals shown in FIG. 6;
fig. 9 is a timing diagram illustrating drive control of digital micromirror plates by image display driving signals according to another exemplary embodiment;
FIG. 10 is a timing diagram illustrating an exemplary embodiment of adding a specified time period to the timing of the image display driving signals shown in FIG. 9;
fig. 11 is a timing diagram illustrating another exemplary embodiment after adding a specified period of time to the timing of the image display driving signal illustrated in fig. 9;
fig. 12 is a block diagram illustrating an apparatus for implementing digital micromirror plate driving control in projection imaging according to an exemplary embodiment.
While certain embodiments of the present application have been illustrated by the accompanying drawings and described in detail below, such drawings and description are not intended to limit the scope of the inventive concepts in any manner, but are rather intended to explain the concepts of the present application to those skilled in the art by reference to the particular embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
FIG. 1 is a schematic diagram illustrating one implementation environment in accordance with an example embodiment. As shown in FIG. 1, an implementation environment of the invention includes: a DLP projector 100 and a video signal output terminal 200.
The video signal output terminal 200 is connected with the DLP projector 100 in a data communication manner, the video signal output terminal 200 transmits a video signal to the DLP projector 100, and after receiving the video signal, the DLP projector 100 processes the video signal to generate image data, and projects a projection display image related to the video signal according to the image data.
The video signal output terminal 200 includes a smart phone, a tablet computer, a notebook computer, or any other electronic device capable of outputting a video signal or an image, which is not limited herein.
FIG. 2 is a schematic diagram illustrating a DLP projector 100 according to an exemplary embodiment. As shown in fig. 2, the DLP projector 100 includes a light source 101, an optical system 102, a digital micro-mirror device 103, a projection lens 104, a multimedia data processing module 105, and a light modulator driving module 106.
Light emitted from the light source 101 is optically processed by the optical system 102 and then projected onto the digital micromirror device 103. The video signal output by the video signal output terminal 200 is processed by the multimedia data processing module 105 to generate image data of the image to be projected and displayed, where the image data includes an image display driving signal of the image to be projected and displayed. The light modulation driving module 106 performs driving control on the digital micromirror device 103 through an image display driving signal, so that after the digital micromirror device 103 processes the incident light, the processed light performs imaging display through the projection lens 104.
Specifically, the digital micromirror device 103 is controlled by the image display driving signal to switch each integrated digital micromirror back and forth between "ON" state and "OFF" state, respectively. The "ON" state is that the digital micro-reflector plate deflects to a certain angle in the positive direction, the digital micro-reflector plate reflects the incident light into the projection lens 104, and accordingly a bright-state pixel point is generated ON the projection screen; the OFF state is that the digital micromirror deflects to the negative direction by the same angle, and the digital micromirror reflects the incident light to the outside of the projection lens 104, and accordingly generates a dark-state pixel point on the projection screen. Therefore, the deflection of the digital micro-reflector towards the positive direction and the negative direction can be controlled to control a certain pixel point to alternate back and forth between brightness and darkness, and the on-off time of the brightness and the darkness is controlled and determined by the image display driving signal, so that different gray scales are formed on the pixel point.
Due to the high-speed rotation of the color wheel (not shown in fig. 2) disposed in the optical system 102, one of R, G, B three primary colors of light is emitted to the digital micromirror device 103 at different times, and the light emitted to the digital micromirror device 103 is modulated by the light modulation driving module 106 to form different gray scales for displaying on the projection screen, so that the human visual system concentrates the three primary colors of light to see the image to be projected.
For example, when performing projection display on a certain pixel in a frame of picture, it is assumed that the timing sequence of the image display driving signal driving the digital micromirror plate to modulate the light of an incident primary color is as shown in fig. 3, wherein a blank part indicates that the digital micromirror plate is driven to deflect in a forward direction, a shaded part indicates that the digital micromirror plate is driven to deflect in a reverse direction, and the digital micromirror plate modulates the light of the incident primary color according to the timing sequence shown in fig. 3, and then displays the modulated light as a gray scale of the primary color on the corresponding pixel of the projection screen. The gray value of the primary color displayed on the corresponding pixel of the projection screen is the same as the gray value of the primary color on the projected pixel.
It should be understood that the digital micromirror plate maintains a state of being deflected by a certain angle in a positive direction during a time corresponding to the blank portion shown in fig. 3, and maintains a state of being deflected by the same angle in a negative direction during a time corresponding to the shaded portion.
Since the deflection of the digital micromirror plate is achieved by the rotation device disposed thereunder, if the rotation device is maintained to deflect in a certain direction for a long time, the mechanical properties of the rotation device may be deteriorated. Based on the above, the application provides a method for realizing drive control of a digital micro-reflector in projection imaging, which is characterized in that the digital micro-reflector is controlled to deflect positively and negatively according to preset times in the process of carrying out projection display on each frame of image, so that the anti-aging of a rotating device is realized. The details of the method are described in the following examples.
It should be noted that the DLP projector shown in fig. 2 is only one example adapted to the present invention and should not be considered as providing any limitation to the scope of use of the present invention. Nor should the DLP projector be interpreted as requiring the reliance upon, or necessity of, one or more components of the exemplary DLP projector shown in fig. 2.
Fig. 4 is a flowchart illustrating a method for implementing digital micromirror plate driving control in projection imaging, which is suitable for the DLP projector 100 shown in fig. 1, according to an exemplary embodiment. As shown in fig. 4, the method comprises at least the following steps:
in step 310, in the projection display of each frame image by the digital micro-mirror plate, a specified time period is selected according to the primary color display time of the projected pixel.
When the digital micromirror device performs projection display on the image to be projected and displayed, each digital micromirror is in one-to-one correspondence with each pixel in the image to be projected and displayed, so that for the digital micromirror device, the projection display of the image to be projected and displayed is substantially the projection display of each pixel in the image.
Therefore, in the projection display of each frame of image by the digital micro-reflector, the primary color display time of the projected pixels of the digital micro-reflector is specifically as follows: and each digital micro-reflector plate modulates the light rays of the primary colors in the process of carrying out projection display on the corresponding pixels in each frame of image.
The time length corresponding to the appointed time period is a preset value and is used for representing the time length of the digital micro-reflector plate which needs to carry out anti-aging movement in the process of carrying out projection display on each frame image. The time length may be stored in advance in a memory or other storage unit configured in the DLP projector, and is not limited herein.
In an exemplary embodiment, the time length corresponding to the designated time period is set according to a predetermined primary color on the pixel projected by the digital micromirror plate. Specifically, let n be the maximum gray-scale value projected and displayed by the DLP projector for each primary color, and a be the time during which the digital micromirror plate is driven by the image display driving signal to modulate the light entering the predetermined primary color within one frame time. If the gray value projected and displayed by the preset primary color light is modulated to be 1, the time for the digital micro-reflector plate to carry out positive deflection is controlled to be a/n, and the time for carrying out negative deflection is controlled to be (n-1) tr.
The time length Tm corresponding to the designated time period may be set to 2m × tr, where m is the gray scale value of the preset primary color. Within the time length, the digital micro-reflector plate deflects positively and negatively according to the preset times so as to realize the anti-aging of the rotating device corresponding to the digital micro-reflector plate.
As shown in fig. 5, in an exemplary embodiment, selecting the designated time period based on the primary color display times of the pixels projected by the digital micromirror plate may comprise the steps of:
and 311, acquiring the primary color display time of each primary color on the pixel projected by the digital micro-reflector.
The primary color display time of each primary color on a pixel projected by the digital micro-reflector can be obtained according to an image display driving signal, and the reasons are as follows:
since the image display driving signal corresponding to each frame of image is used to drive the digital micromirror plate to modulate the light beams of different primary colors emitted in each frame time, the image display driving signal should include the time for driving and controlling the digital micromirror plate to modulate the light beams of different primary colors respectively, that is, the primary color display time of each primary color on the projected pixel. The sum of the time for modulating the different primary color light rays is one frame time.
Furthermore, the image display driving signal should also include a timing sequence for driving and controlling the digital micromirror plate to modulate the light beams of different primary colors, respectively, where the timing sequence includes the time for driving the digital micromirror plate to make a positive deflection and a negative deflection.
The time of the digital micro-mirror plate for positive deflection and negative deflection determines the gray value displayed on the projection screen by each primary color, and the gray value displayed on the projection screen is the same as the gray value of each primary color on the projected pixel in each frame of picture, so the time of the digital micro-mirror plate for positive deflection and the time of the digital micro-mirror plate for negative deflection in the process of modulating the light of each primary color by the digital micro-mirror plate can be obtained according to the gray values of different primary colors on each pixel in each frame of picture.
For example, if the actual gray value of the predetermined primary color is x, the digital micromirror plate performs a positive deflection for x × tr and performs a negative deflection for (n-x) × tr during the process of modulating the light of the predetermined primary color.
In order to ensure that the digital micro-reflector plate can deflect positively and negatively according to the preset times in the process of carrying out projection display on each frame of image, the time for modulating the incident light by the digital micro-reflector plate needs to be ensured, and the time length corresponding to the specified time period can be met. Namely, the time for the digital micro-mirror plate to deflect positively and negatively according to the preset times can be satisfied.
Therefore, it is necessary to determine which one or more primary colors of light are modulated by the digital micromirror plate, and the digital micromirror plate is deflected positively and negatively according to the preset times according to the time when the digital micromirror plate modulates the light of each primary color. The primary that can be determined is then the target primary.
For a process of determining a target primary color according to the acquired primary color display time, please refer to the following embodiments, which are not described herein again.
The primary color display time of the target primary color necessarily meets the time length corresponding to the specified time period, so that a continuous period of time can be arbitrarily selected from the primary color display time of the target primary color as the specified time period. It should be noted that the length of the selected continuous time should be adapted to the length of time corresponding to the specified time period.
And step 320, in a designated time period, driving and controlling the digital micro-mirror plate to deflect positively and negatively according to preset times.
As described above, since the time length corresponding to the designated time period is a preset fixed value, the number of times that the digital micromirror plate performs positive and negative deflection within the time length can be preset by controlling the unit time of the positive and negative deflection performed by the digital micromirror plate.
For example, if the time length Tm corresponding to the specified time period is 2m × tr, and the digital micromirror plate is set to perform positive deflection and negative deflection respectively per unit time tr within the time length, the number of times that the digital micromirror plate performs positive and negative deflection is 2 times.
Similarly, because the time length corresponding to the designated time period is a preset fixed value, if the unit time of the positive and negative deflection of the set digital micro-mirror plate is changed, the times of the positive and negative deflection of the preset digital micro-mirror plate are correspondingly changed. For example, the unit time is set to 2tr, and the number of times of positive and negative deflection of the digital micromirror plate is set to 1.
Therefore, when the digital micro-reflector plate performs projection display of each frame image, the digital micro-reflector plate is driven and controlled to perform positive and negative deflection according to the preset times in the selected specified time period, so that the anti-aging of the rotating device corresponding to the digital micro-reflector plate can be realized.
Specifically, in an exemplary embodiment, the method for acquiring the target primary color satisfying the time length corresponding to the specified time period from the primary colors on the projected pixel according to the acquired primary color display time in step 312 is as follows:
in one embodiment, if the primary color display time of the single primary color is obtained to satisfy the time for the digital micro-mirror plate to perform forward deflection within the time length corresponding to the specified time period, the single primary color is selected as the target primary color.
First, it is determined whether the projected pixel includes a predetermined primary color. If the digital micro-mirror chip comprises the preset primary colors, the digital micro-mirror chip carries out forward deflection time in the time length corresponding to the specified time period or not according to whether the forward deflection time of the digital micro-mirror chip in the primary color display time of the preset primary colors is greater than or equal to the forward deflection time of the digital micro-mirror chip in the time length corresponding to the specified time period or not.
Because the digital micro-mirror plate carries out positive and negative deflection according to the preset times in the appointed time period, in the time length corresponding to the appointed time period, the time for the digital micro-mirror plate to carry out positive deflection and the time for the digital micro-mirror plate to carry out negative deflection are both half of the time length corresponding to the appointed time period, namely m × tr. In the primary color display time of the preset primary color, the time for the digital micro-reflector plate to deflect positively is x × tr, and the time for the digital micro-reflector plate to deflect negatively is (n-x) × tr, wherein x is the actual gray value of the preset primary color in the projected pixel, and n is the maximum gray value projected and displayed by the DLP projector.
Therefore, whether the time for the digital micro-mirror plate to perform forward rotation in the primary color display time of the preset primary color is longer than or equal to the time length corresponding to the specified time period in the time period for the digital micro-mirror plate to perform forward deflection in the primary color display time of the preset primary color in the projected pixel can be judged through the actual gray value x of the preset primary color and the gray value m of the preset primary color corresponding to the specified time period, namely whether the condition x is more than or equal to m is met.
Fig. 6 is a timing diagram illustrating an exemplary embodiment of driving a digital micromirror plate by image display driving signals to modulate light of a predetermined primary color when x is equal to m, and fig. 7 is a timing diagram illustrating an exemplary embodiment of adding a specified time period to the image display driving signals illustrated in fig. 6. As can be seen from fig. 6 and 7, since the forward deflection time of the digital micromirror plate in the designated time period is m × tr, only when x is greater than or equal to m, it can be ensured that the digital micromirror plate has the time required for forward deflection in the designated time period in the process of modulating the light of the preset primary color.
Therefore, if x ≧ m is satisfied, it can indicate that the primary color display time of the preset primary color satisfies the time length corresponding to the specified time period, and determine the preset primary color as the target primary color.
In another embodiment, on the basis of the above embodiment, if the primary color display time of a single primary color is obtained and also satisfies the time for the digital micromirror plate to make negative deflection within the time length corresponding to the specified time period, the single primary color is selected as the target primary color.
Specifically, on the basis of the above embodiment, it is further required to determine whether the time for the digital micromirror to perform negative deflection in the primary color display time of the preset primary color is greater than or equal to the time for the digital micromirror to perform negative deflection in the time length corresponding to the specified time period. Namely, whether the condition n-m is more than or equal to x is judged.
Fig. 9 is a timing diagram illustrating an image display driving signal driving a digital micromirror plate to modulate light of a preset primary color when n-m is x according to an exemplary embodiment, and fig. 10 is a timing diagram illustrating an exemplary embodiment after adding a specified time period to the image display driving signal illustrated in fig. 9. As can be seen from fig. 9 and 10, since the time for the digital micromirror plate to perform negative deflection is m × tr in the designated time period, only when n-m is greater than or equal to x, it can be ensured that the digital micromirror plate has the time required for performing negative deflection in the designated time period in the process of modulating the light of the preset primary color.
Therefore, the condition that the display time of the primary colors of the preset primary colors meets the time length corresponding to the specified time period can be that n-m is more than or equal to x and more than or equal to m. And if the condition is met, selecting the preset primary color as the target primary color.
If the determined target primary color is the preset primary color, the digital micro-mirror chip is driven and controlled to deflect positively and negatively according to the preset times within the appointed time period in the process of carrying out projection display on the preset primary color on the projected pixel by the digital micro-mirror chip, so that the anti-aging of the rotating device is realized. Accordingly, the timing diagrams of the image display driving signals for driving the digital micromirror plate to modulate light of the predetermined primary color can be seen in fig. 7 and 10.
In another embodiment, if the primary color display time of the preset primary color does not satisfy the time length corresponding to the specified time period (i.e. x < m or x > n-m), or the projected pixel does not include the preset primary color, it is determined according to the above contents whether there is a primary color whose primary color display time satisfies the time length corresponding to the specified time period in other primary colors on the projected pixel, and the satisfied primary color is selected as the target primary color.
If the determined target primary color is one of other primary colors, the digital micro-mirror plate is controlled to carry out positive and negative deflection according to preset times in a specified time period in the process of carrying out projection display on the primary color on the projected pixel by driving the digital micro-mirror plate so as to realize the anti-aging of the rotating device.
The positive and negative deflection of the digital micromirror plate can be performed in unit time according to the time tr 'of forward deflection of the digital micromirror plate when the gray value of the primary color is 1, so as to reach the time length Tm corresponding to the specified time period 2 m' tr ', wherein m' can be understood as the gray value of the set primary color.
Since the time for the digital micromirror plate to perform forward rotation may be different when the gray value of the different primary colors is 1, that is, the value of tr may be different from the value of tr ', in order to ensure that the time length Tm corresponding to the specified time period is a fixed value, the value of m' is correspondingly different from the value of m.
It should be noted that, if the obtained gray value m' is not an integer, when the digital micromirror plate is controlled to perform positive and negative deflection, the gray value is automatically added by one, then the integral part of the sum is taken as the gray value m "of the primary color, and the digital micromirror plate actually performs positive and negative deflection according to the gray value m".
Because m 'is greater than m', the time for actually carrying out positive and negative deflection on the digital micro-reflector plate is longer than the time length corresponding to the set specified time period, so that the time for carrying out positive and negative deflection on the digital micro-reflector plate can reach the time length corresponding to the set specified time period, and the anti-aging requirement of the rotating device is met.
Thus, a single primary color as described above is to be understood as one of the primary colors on the pixel onto which the digital micromirror plate is projected.
In yet another exemplary embodiment, if the primary color display time of each primary color is not satisfied with the time for the digital micromirror plate to deflect in the positive direction within a specified time period, or with the time for the digital micromirror plate to deflect in the negative direction within a specified time period (i.e., x < m or x > n-m), each primary color on the projected pixel is selected as the target primary color.
If the determined target primary colors are all primary colors on the projected pixel, sub-time periods are respectively selected from the primary color display time of each primary color, so that the sum of the sub-time periods is the time length corresponding to the preset specified time period. In the process of projection display of the digital micro-mirror chip on each primary color, the digital micro-mirror chip is driven and controlled to deflect positively and negatively according to preset times in each sub-time period.
For convenience of understanding, if it is assumed that the projected pixel includes R, G, B three primary colors, and the sub-periods of the primary colors are 2mR*trR、2mG*trG、2mB*trBThere is an anti-aging exercise time
Wherein, trR、trG、trBRespectively representing the time of the digital micro-reflector plate for carrying out forward deflection when the gray value of each primary color is 1, mR、mG、mBRespectively representing the gray scale value of each set primary color.
In one embodiment, the time lengths of the sub-periods are the same, i.e. m is equalR*trR*＝mG*trG＝mB*trB。
As mentioned above, when the gray value of different primary colors is 1, the time for the digital micromirror plate to perform the forward deflection may be different, and therefore, the gray value m of each primary color is setR、mG、mBAnd also vary. Since the time length Tm of the preset specified time period is a fixed value, the set gray value of each primary color may not be an integer, and at this time, the gray value is added by one, and then the integral part of the sum is taken as the gray value of each primary color.
In another embodiment, the time lengths of the selected sub-time periods may be different, and it is only necessary to ensure that the sum of the time lengths of the sub-time periods is the time length corresponding to the preset specified time period, so that the digital micromirror can be flexibly controlled to perform positive and negative deflection.
It should be noted that, in this embodiment, the actual positive and negative deflection time of the digital micromirror is longer than the time length corresponding to the set specified time period, so as to ensure that the positive and negative deflection time of the digital micromirror can reach the time length corresponding to the set specified time period, thereby meeting the anti-aging requirement of the rotation device.
It should be noted that, as described above, the specified time period selected from the primary color display time of the target primary color is arbitrary, and therefore, the present embodiment does not limit the time when the digital micromirror plate starts to perform positive and negative deflection during the projection display of the target primary color.
Fig. 8 is a timing diagram illustrating the driving of the digital micromirror plate to modulate light of a predetermined primary color after the image display driving signal is added with the anti-aging movement time according to another embodiment, as shown in fig. 8 and 11, and fig. 11 is a timing diagram illustrating the driving of the digital micromirror plate to modulate light of a predetermined primary color after the image display driving signal is added with the anti-aging movement time according to another exemplary embodiment, when x-m is x.
As can be seen from fig. 6 to 8 and fig. 9 to 11, in the process of performing projection display on the target primary color by the digital micromirror, the time for starting positive and negative deflection may be any, and it is only necessary to ensure that the digital micromirror has sufficient time to implement the time sequence corresponding to the specified time period in the process of modulating the light of the target primary color.
In summary, the method for implementing drive control of the digital micromirror in the projection imaging provided by the present application combines the time for performing the anti-aging operation with the drive control timing sequence of the digital micromirror by the image display drive signal during the projection display process of each frame of image, and flexibly drives and controls the digital micromirror to perform positive and negative deflection, thereby implementing anti-aging of the rotating device corresponding to the digital micromirror.
Fig. 12 is a block diagram illustrating an apparatus for digital micromirror plate driving control in projection imaging according to another embodiment. As shown in fig. 12, the apparatus includes a designated period selection module 410 and a drive control module 420.
The designated time period selecting module 410 is configured to select a designated time period according to the primary color display time of the projected pixel during the projection display of each frame image by the digital micro-mirror.
The driving control module 420 is configured to drive and control the digital micromirror plate to perform positive and negative deflection according to preset times within a specified time period.
In another exemplary embodiment, the specified time period selection module 410 includes a primary color display time acquisition unit, a target primary color acquisition unit, and a time period selection unit.
The primary color display time acquisition unit is used for acquiring the primary color display time of each primary color on a pixel projected by the digital micro-reflector.
The target primary color obtaining unit is used for obtaining a target primary color meeting the time length corresponding to the specified time period from each primary color on the projected pixel according to the obtained primary color display time.
The time period selection unit is used for selecting a specified time period from the primary color display time of the target primary color.
In another exemplary embodiment, the target primary color obtaining unit includes a first judging sub-unit. The first judgment subunit is used for selecting the single primary color as the target primary color under the condition that the primary color display time of the acquired single primary color meets the time for the digital micro-reflector to deflect in the forward direction within the specified time period.
In another exemplary embodiment, the target primary color obtaining unit includes a second judging sub-unit. The second judgment subunit is used for selecting the single primary color as the target primary color under the condition that the acquired primary color display time of the single primary color meets the time of the digital micro-reflector plate for positive deflection in a specified time period and meets the time of the digital micro-reflector plate for negative deflection in the specified time period.
In another embodiment, the time period selection unit comprises a first selection subunit. The first selection unit is used for selecting a continuous time from the primary color display time of the single primary color as a specified time period, and the selected continuous time is the same as the time length corresponding to the specified time period.
In another exemplary embodiment, the drive control module 420 includes a first drive control unit. The first driving control unit is used for driving and controlling the digital micro-reflector to deflect positively and negatively according to preset times in a specified time period in the process of carrying out projection display on a single primary color by the digital micro-reflector.
In another exemplary embodiment, the target primary color obtaining unit includes a third judging sub-unit. The third judging subunit is configured to select each primary color on the projected pixel as the target primary color when the primary color display time of each primary color is obtained and does not meet the time for the digital micro-mirror plate to perform positive deflection in the specified time period or the time for the digital micro-mirror plate to perform negative deflection in the specified time period.
In another exemplary embodiment, the time period selection unit includes a second selection subunit. The second selection sub-unit is used for respectively selecting sub-time periods from the display time of each primary color according to each primary color on the projected pixel, and the sum of the time lengths corresponding to the sub-time periods is the time length corresponding to the specified time period.
In another exemplary embodiment, the drive control module 420 includes a second drive control unit. The second driving control unit is used for driving and controlling the digital micro-reflector to respectively carry out positive and negative deflection according to preset times in each sub-time period in the process of carrying out projection display on each primary color on the projected pixel by the digital micro-reflector.
It should be noted that the apparatus provided in the foregoing embodiment and the method provided in the foregoing embodiment belong to the same concept, and the specific manner in which each module performs operations has been described in detail in the method embodiment, and is not described again here.
In one exemplary embodiment, a projection device includes:
a processor; and
and a memory, wherein the memory stores computer readable instructions, and the computer readable instructions when executed by the processor implement the method for controlling the driving of the digital micro-mirror in projection imaging in the embodiments.
In an exemplary embodiment, a computer-readable storage medium has a computer program stored thereon, and when executed by a processor, implements the method of implementing digital micromirror plate driving control in projection imaging in the above-described embodiments.
The above description is only a preferred exemplary embodiment of the present application, and is not intended to limit the embodiments of the present application, and those skilled in the art can easily make various changes and modifications according to the main concept and spirit of the present application, so that the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method for implementing digital micromirror plate driving control in projection imaging, the method comprising:
in the projection display of each frame image through the digital micro-reflector plate, selecting a specified time period according to the primary color display time of the projected pixel;
and in the appointed time period, the digital micro-reflector plate is driven and controlled to deflect positively and negatively according to the predicted times.
2. The method according to claim 1, wherein selecting the designated time period according to the primary color display time of the projected pixel in the projection display of each frame image by the digital micromirror plate comprises:
acquiring the primary color display time of each primary color on a projected pixel of the digital micro-reflector plate;
acquiring a target primary color meeting the time length corresponding to the specified time period from each primary color on the projected pixel according to the acquired primary color display time;
the specified time period is selected from the primary display times of the target primaries.
3. The method according to claim 2, wherein the obtaining, from the primary colors on the projected pixel, the target primary color satisfying the time length corresponding to the specified time period according to the obtained primary color display time comprises:
and if the primary color display time of the single primary color is acquired, the time for the digital micro-mirror plate to deflect in the forward direction in the specified time period is met, and the single primary color is selected as the target primary color.
4. The method of claim 3, wherein said selecting said single primary color as said target primary color if said primary color display time of said single primary color is obtained to satisfy said time for forward deflection of said digital micromirror plate within said specified time period comprises:
if the primary color display time of the preset primary color is obtained, the time of the digital micro-reflector plate for carrying out forward deflection in the specified time period is met, and the preset primary color is selected as the target primary color;
otherwise, selecting one primary color from other primary colors on the projected pixel as the target primary color, wherein the primary color display time of the target primary color meets the time for the digital micro-mirror plate to perform forward deflection in the specified time period.
5. The method according to claim 2, wherein the obtaining, from the primary colors on the projected pixel, the target primary color satisfying the time length corresponding to the specified time period according to the obtained primary color display time comprises:
and if the primary color display time of the single primary color is acquired, the time for the digital micro-mirror plate to perform positive deflection in the specified time period is met, and the time for the digital micro-mirror plate to perform negative deflection in the specified time period is met, selecting the single primary color as the target primary color.
6. The method according to any one of claims 3 to 5, wherein the selecting the specified time period from the primary display time of the target primary comprises:
and selecting a continuous time from the primary color display time of the single primary color as the specified time period, wherein the continuous time is the same as the time length corresponding to the specified time period.
7. The method according to any one of claims 3 to 5, wherein the driving and controlling the digital micromirror plate to perform periodic positive and negative deflection motion in the specified time period comprises:
and in the process of carrying out projection display on the single primary color by the digital micro-reflector, the digital micro-reflector is driven and controlled to carry out positive and negative deflection according to preset times in the specified time period.
8. The method according to claim 2, wherein the obtaining, from the primary colors on the projected pixel, the target primary color satisfying the time length corresponding to the specified time period according to the obtained primary color display time comprises:
and if the acquired primary color display time of each primary color does not meet the time for the digital micro-mirror plate to perform positive deflection in the specified time period or the time for the digital micro-mirror plate to perform negative deflection in the specified time period, selecting each primary color on the projected pixel as the target primary color.
9. The method according to claim 8, wherein said selecting the specified time period from the display time of the primary color corresponding to the target primary color comprises:
and respectively selecting sub-time periods from the display time of each primary color according to the primary colors on the projected pixels, wherein the sum of the time lengths corresponding to the sub-time periods is the time length corresponding to the specified time period.
10. The method of claim 9, wherein the driving the digital micromirror plate for the specified time period to perform periodic positive and negative deflection motions comprises:
and in the process that the digital micro-reflector respectively performs projection display on each primary color on the projected pixels, the digital micro-reflector is driven and controlled to respectively perform positive and negative deflection within each sub-time period according to preset times.
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| CN111240144B (en) | 2022-08-05 |
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