CN118015946A - Screen ghost eliminating method, display module and terminal equipment - Google Patents
Screen ghost eliminating method, display module and terminal equipment Download PDFInfo
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Abstract
The application is applicable to the technical field of projection, and provides a method for eliminating screen afterimage, a display module and terminal equipment, wherein the method comprises the following steps: detecting the display time of the display screen for displaying the first picture; and if the display time length reaches a first preset time length, controlling the display screen to display the first picture according to a first rule, wherein the first rule is that the relative position of the first picture relative to the display screen is changed from an initial position to a first position, and then the first position returns to the initial position. By the method, the occurrence probability of the afterimage phenomenon caused by the fact that the picture in the display screen is in a certain still picture for a long time can be effectively reduced, the visual effect is improved, and accordingly the user's look and feel is improved.
Description
Technical Field
The application belongs to the technical field of projection, and particularly relates to a screen ghost elimination method, a display module and terminal equipment.
Background
Some of the existing projectors use liquid crystal display panels (3 lcd, lcos, etc.) to make the pixels in the same state for a long time when processing static images, and the long-time use of the static state can cause some afterimages on the screen images.
In the existing method for eliminating the screen ghost, the moving picture is processed by introducing an algorithm, so that motion blur and ghost are reduced, the ghost phenomenon can be reduced in the post-processing, and the picture definition is improved. However, the method has higher requirements on the performance of the processor and the optimization of the algorithm, the equipment cost can be increased, other image distortion or delay can be introduced in the processing process, the look and feel of the user is reduced, and the visual effect is seriously affected.
Disclosure of Invention
The embodiment of the application provides a ghost eliminating method, a display module and terminal equipment, which can effectively reduce the occurrence probability of ghost phenomenon caused by a certain static picture in a display screen for a long time, and improve the visual effect, thereby being beneficial to improving the look and feel of a user.
In a first aspect, an embodiment of the present application provides a method for removing ghost images, including:
Detecting the display time of the display screen for displaying the first picture;
and if the display time length reaches a first preset time length, controlling the display screen to display the first picture according to a first rule, wherein the first rule is that the relative position of the first picture relative to the display screen is changed from an initial position to a first position, and then the first position returns to the initial position.
In the embodiment of the application, if the display duration of the first picture displayed by the display screen reaches the first preset duration, the display screen is indicated to display the static picture for a long time. In this case, the control display displays the first screen according to the first rule, which corresponds to "moving" the still screen by control. By the mode, the occurrence probability of the afterimage phenomenon caused by the fact that the picture in the display screen is in a certain still picture for a long time can be effectively reduced, the visual effect is improved, and accordingly the user's look and feel is improved.
In a possible implementation manner of the first aspect, the controlling the display to display the first screen according to a first rule includes:
Acquiring the display frequency of the display screen;
And controlling the display screen to display the first picture according to a first rule according to the display frequency.
In the embodiment of the application, controlling the display screen to display the first picture according to the display frequency of the display screen means that the display screen updates the picture with enough frequency to match the requirement of the first rule, in other words, the display screen can refresh the picture with enough speed to display the picture according to the first rule, so that the display accuracy and consistency of the first picture can be ensured, and the user can obtain better visual effect and experience.
In a possible implementation manner of the first aspect, the controlling, according to the display frequency, the display screen to display the first picture according to a first rule includes:
Acquiring a second preset time length according to the display frequency;
And controlling the display screen to display the first picture according to a first rule every second preset time.
In the embodiment of the application, the time interval between each picture update is determined according to the display frequency of the display screen. And controlling the display screen to display the first picture according to the first rule every second preset time length, so as to ensure that the first picture is redisplayed every certain time interval, so that the stability and consistency of the picture are maintained, and better visual effect and user experience are provided.
In a possible implementation manner of the first aspect, the obtaining a second preset duration according to the display frequency includes:
Determining a display period of the display screen according to the display frequency;
And determining the second preset time length according to the display period.
In the embodiment of the application, the time required for finishing refreshing the picture once by the display screen in each period is determined according to the display frequency of the display screen, namely according to the hardware characteristics of the display screen, so that the stability and consistency of the picture are ensured. By associating the second preset duration with the display period, the interval of redisplaying the first picture can be synchronized with the refresh period of the display screen, and the stability and consistency of the picture are further improved. This helps to reduce picture tearing, blurring and visual fatigue, providing a more comfortable viewing experience.
In a possible implementation manner of the first aspect, the display screen is provided with a galvanometer, and the method further includes:
acquiring a first position of the first picture relative to the display screen;
acquiring the inclination angle of the vibrating mirror according to the first position;
And controlling the vibrating mirror to incline to the inclination angle so that the relative position of the first picture and the display screen is the initial position.
In the embodiment of the application, the inclination angle of the vibrating mirror to be adjusted is calculated according to the first position of the first picture movement so as to move the first picture to the initial position before the first picture movement again through the inclination angle, thereby ensuring that the projection position of the first picture is kept unchanged, avoiding the phenomenon of deviation or distortion and improving the user experience.
In a possible implementation manner of the first aspect, the obtaining the inclination angle of the galvanometer according to the first position includes:
Acquiring a first distance of the first picture moving relative to the display screen according to the first position;
Acquiring optical parameters of the vibrating mirror;
And acquiring the inclination angle of the vibrating mirror according to the first distance and the optical parameter.
In the embodiment of the application, the inclination angle of the vibrating mirror is dynamically adjusted according to the movement condition of the first picture and the optical characteristic of the vibrating mirror, so that the picture can be accurately projected. By acquiring the first distance and the optical parameters in real time, the system can respond to the change of the picture position more intelligently, the first picture is ensured to be projected at the original position all the time, the accuracy and the stability of picture projection are facilitated, and the performance and the user experience of the display system are improved.
In a possible implementation manner of the first aspect, the method further includes:
and determining the vibration frequency of the vibrating mirror according to the display frequency.
In the method, determining the vibration frequency of the vibrating mirror according to the display frequency means synchronizing the vibration rate of the vibrating mirror with the display frequency so as to ensure that the vibrating mirror can adjust the position in time to reflect the light beam, thereby realizing stable projection of the picture and avoiding flicker or distortion of the picture.
In a second aspect, an embodiment of the present application provides a display module, including:
a display screen for implementing the screen ghost elimination method according to any one of the first aspect;
And the vibrating mirror is used for adjusting the position of the picture relative to the display screen.
In a third aspect, an embodiment of the present application provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the method for eliminating screen afterimage according to any one of the first aspect when executing the computer program.
In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the screen ghost elimination method as in any one of the first aspects above.
In a fifth aspect, an embodiment of the present application provides a computer program product, which when run on a terminal device, causes the terminal device to perform the screen ghost elimination method according to any one of the first aspects above.
It will be appreciated that the advantages of the second to fifth aspects may be found in the relevant description of the first aspect, and are not described here again.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for eliminating screen afterimage according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a first rule provided by an embodiment of the present application;
FIG. 3 is a schematic flow chart of acquiring an inclination angle according to an embodiment of the present application;
FIG. 4 is a schematic diagram of the principle of a galvanometer according to an embodiment of the application;
Fig. 5 is a schematic structural diagram of a display module according to an embodiment of the present application;
Fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As used in the present description and the appended claims, the term "if" may be interpreted as "when..once" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if a determination" or "if a [ described condition or event ] is detected" may be interpreted in the context of meaning "upon determination" or "in response to determination" or "upon detection of a [ described condition or event ]" or "in response to detection of a [ described condition or event ]".
Furthermore, the terms "first," "second," "third," and the like in the description of the present specification and in the appended claims, are used for distinguishing between descriptions and not necessarily for indicating or implying a relative importance.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise.
Some conventional projectors include liquid crystal display panels (3 lcd, lcos, etc.). Liquid crystal molecules in a liquid crystal projector are affected by an electric field during operation, and the presence of charged ions inside the liquid crystal disrupts this electric field. When the liquid crystal molecules are adjusted to the correct angle by the electric field, they form a clear image. However, when the liquid crystal displays the same picture for a long time, charged ions may be gradually adsorbed at both ends of the glass of the liquid crystal panel, forming a built-in electric field. This built-in electric field interacts with the electric field required for liquid crystal display, resulting in failure of the liquid crystal molecules to rapidly transfer to the correct angle. Therefore, when the frame is switched, the liquid crystal molecules on the previous frame do not immediately return to the original state, but are affected by the built-in electric field, so that the phenomenon of 'ghost' is caused. In other words, after the second frame appears, the first frame is still left on the display screen, which results in abnormal display, thereby affecting the visual effect.
In some solutions, the moving picture is processed by introducing an algorithm, so that motion blur and ghost are reduced, the ghost phenomenon can be reduced in the post-processing, and the picture definition is improved. However, the method has higher requirements on the performance of the processor and the optimization of the algorithm, the equipment cost can be increased, other image distortion or delay can be introduced in the processing process, the look and feel of the user is reduced, and the visual effect is seriously affected.
In order to solve the above problems, an embodiment of the present application provides a method for eliminating a screen ghost, which indicates that a display screen displays a static picture for a long time if a display duration of a first picture displayed on the display screen reaches a first preset duration. In this case, the control display displays the first screen according to the first rule, which corresponds to "moving" the still screen by control. By the mode, the occurrence probability of the afterimage phenomenon caused by the fact that the picture in the display screen is in a certain still picture for a long time can be effectively reduced, the visual effect is improved, and accordingly the user's look and feel is improved.
Referring to fig. 1, a flowchart of a method for eliminating a screen residual image according to an embodiment of the present application is shown.
S101, detecting display duration of a first picture displayed by a display screen.
In the embodiment of the application, the system monitors the display time length of the first picture on the display screen. During this process, the system will record the point in time when the first frame starts to be displayed and continue monitoring until it is switched or replaced with the next frame.
In some implementations, the system may integrate a built-in timer that is responsible for recording the time the first frame starts to display and continuously updating the current time. The system can periodically detect the time of displaying the first picture and the starting time, and calculate the display duration of the first picture.
In other implementations, the system starts a timer when the first frame starts to be displayed, which may be implemented by a timer function or class provided by the programming language. The timer periodically detects the display status of the first frame, typically in milliseconds. At the end of each cycle, the system checks if the first picture is still being displayed and if so, the system accumulates the elapsed time to record the display duration.
In the method, the system can more intelligently adjust the display content and the position by recording the display time of the first picture, so that the user experience and the overall performance of the system are improved.
S102, if the display time length reaches a first preset time length, controlling the display screen to display the first picture according to a first rule, wherein the first rule is that the relative position of the first picture relative to the display screen is changed from an initial position to a first position, and then the first position returns to the initial position.
In the embodiment of the application, if the display time length is monitored to reach the first preset time length, the system controls the display of the first picture on the display screen according to a certain rule. This rule is called a "first rule", and its details describe a process of changing the position of the first screen with respect to the display screen, including changing from the initial position to the first position and then returning from the first position to the initial position. Wherein, there may be a plurality of first positions.
In some implementations, the display content of a single pixel of the liquid crystal panel is adjusted by controlling the image signal sent to the liquid crystal panel by the liquid crystal driving integrated circuit, so that the single pixel is in a static display mode for a short time, which is the shortest time period that does not cause "ghost". Fig. 2 is a schematic diagram of a first rule provided in an embodiment of the present application, taking a change of a single pixel point as an example: if the initial position of the pixel point is A, the pixel point can move in the mode of A, B, C, D and A (as shown in (a) of fig. 2) to form a dynamic circulation track, so that the phenomenon that the same pixel point is displayed statically for a long time to cause residual shadows is avoided. Wherein both positions B, C and D may be referred to as first positions.
Alternatively, at least one pixel point may be displaced at a time. For example, the position a and the position B may be adjacent positions, or may be separated by 1 or more pixel points.
In the embodiment of the application, the moving mode of a single pixel point is applied to all pixel points of the display, and the displacement is synchronously carried out, so that the whole first picture moves according to a first rule.
In other implementations, the pixel point may be moved one or two pixel points at a time in a manner of left-right loop of a→b→c→b→a (as shown in (B) of fig. 2), and the movement manner of a single pixel is applied to all the pixel points of the display, so as to perform the displacement synchronously.
It should be noted that, the embodiment of the present application does not limit the specific implementation manner of the first rule.
In the method, the pixel points are shifted in a cyclic movement mode, so that the phenomenon that the same pixel point is subjected to long-time static display to cause residual shadows can be avoided, and the visual effect is improved.
In one embodiment, step S102 includes:
s201, obtaining the display frequency of a display screen.
In the embodiment of the application, the display frequency of the display screen refers to the number of times the display screen updates the image in unit time. It is typically expressed in hertz (Hz), i.e. the number of updates per second. For example, a 60Hz display means that it refreshes 60 images per second. The display frequency of the display screen directly affects the fluency and stability of the image on the screen, so that obtaining the display frequency of the display screen is very important for understanding the performance of the display screen, and adjusting and optimizing the display screen.
Illustratively, in most operating systems, including Windows, macOS and Linux, a user can view and adjust the display frequency of a display screen through system settings or display attributes. In Windows, the user may right click on the desktop white space, select "display settings", and then view the display frequency of the display screen in the advanced display settings of the display settings page. At macOS, the user can turn on the "system preference settings" and then select the "display" to view the display frequency of the display screen under the "display" tab. In Linux systems, the specific operation mode may be different, but the display frequency of the display screen may also be obtained through system setting or command line.
In the method, the display frequency of the display screen is acquired, so that a user can adjust the display content of the picture according to the display frequency, and smoother visual experience is realized.
S202, controlling the display screen to display a first picture according to a first rule according to the display frequency.
In the embodiment of the application, controlling the display screen to display the first picture according to the first rule according to the display frequency means controlling the number of times the display screen updates the image per second according to the display frequency of the display screen, and ensuring that the first picture is correctly displayed according to the specific rule.
After the display frequency of the display screen is obtained, programming program logic to control the loading sequence of the images according to the required display effect and a first rule of the first picture, and then adjusting the frequency of image updating in the program according to the display frequency of the display screen.
In one implementation, the update frequency of the images may be higher than the display frequency of the display screen, may be a multiple of the display screen frequency, and if the display frequency of the display screen is 60Hz, the display screen updates 120 images per second. In this implementation, the display screen is updated twice as frequently as the display screen.
In another implementation, the update frequency of the image and the display frequency of the display screen may be set equal, for example, if the display frequency of the display screen is 60Hz, the display screen updates 60 images per second.
In the above method, controlling the display screen to display the first picture according to the display frequency of the display screen according to the first rule means that the display screen updates the picture with enough frequency to match the requirement of the first rule, in other words, the display screen can refresh the picture with enough speed to display the picture according to the first rule, so that the accuracy and consistency of the display of the first picture can be ensured, and the user obtains better visual effect and experience.
In one embodiment, step S202 includes:
s301, acquiring a second preset time length according to the display frequency.
In the embodiment of the present application, in one display period, the time required for the pixel point to move from one position to another is referred to as a second preset duration. This time is typically related to the display frequency of the display screen.
In one embodiment, step S301 includes:
determining a display period of the display screen according to the display frequency; and determining a second preset duration according to the display period.
In the embodiment of the application, the display period refers to the time interval from the beginning of the refresh of the display screen to the beginning of the next refresh. It has an inverse relationship to the display frequency, i.e. the display period is equal to 1 divided by the display frequency. Thus, the higher the display frequency, the shorter the display period, and the less time is required for the display screen to complete one refresh.
In some implementations, the display period of the display screen may be determined as a second preset duration, which is to ensure that a refresh operation of the display screen is completed within a time interval of each second preset duration, so as to implement control over display content.
In other implementations, the second preset duration may be set to a multiple of the display period, such as 1/60 second for a display frequency of 60Hz, and then the second preset duration may be 1/30 second. Corresponding to the second preset duration being twice the display period.
According to the method, the second preset time length is determined according to the display period, so that the display behavior of the display screen can be effectively controlled, and the first picture can be ensured to be displayed according to the expected rule in each time interval.
S302, controlling the display screen to display the first picture according to a first rule every second preset time length.
In the embodiment of the application, after a certain time interval (called as a second preset time period), the display screen is controlled to display a first picture determined in advance according to a first rule by a certain mode or program, so that the first picture is not displayed for a long time, and the occurrence of the afterimage phenomenon is reduced.
Illustratively, the order in which the pixels move in the first rule is explicitly, e.g., from left to right, top to bottom, or in a particular trajectory. And triggering the refreshing operation of the display screen every second preset time by using a timer or a timer. This ensures that the operation of moving the pixel point is performed once per time interval. And in each time interval, performing the moving operation of the pixel points according to the first rule. Repeating the steps to realize the continuous moving process. By continuously triggering the movement of the pixel points within the time interval of each second preset duration, a picture moving according to a rule can be displayed on the display screen. For example, if the first rule is to move the pixel points in a left-to-right order, the abscissa of the pixel points may be updated at each time interval of a preset duration, so as to achieve the effect of gradually moving from left to right.
In the method, the time interval between each picture update is determined according to the display frequency of the display screen. And controlling the display screen to display the first picture according to the first rule every second preset time length, so as to ensure that the first picture is redisplayed every certain time interval, so that the stability and consistency of the picture are maintained, and better visual effect and user experience are provided.
In the case of moving the pixels according to the above-described rule, there is a possibility that the projection display position is changed (for example, the display screen overflows from the curtain) after the pixel is shifted, and an optical galvanometer (a galvanometer function: light is shifted by the inclination of the transparent glass because light is not perpendicular to the glass while passing through the transparent glass) may be added to prevent this.
In one embodiment, the display screen is provided with a vibrating mirror, the method further comprising:
s401, acquiring a first position of a first picture relative to a display screen.
In the embodiment of the application, the first position is a position of the pixel after the pixel moves, which means that the first picture can be displayed at different positions on the display screen.
For example, the change in the first position may be determined by setting an initial position of the pixel point and a first rule. As shown in fig. 2 (a), if the start position of the pixel is the a point, and the pixel is shifted one at a time, the positions B, C and D are both referred to as the first position.
S402, acquiring the inclination angle of the vibrating mirror according to the first position.
In the embodiment of the application, the inclination angle refers to the rotation angle of the vibrating mirror relative to the first position. In this context, tilt angle is used to describe the degree of deflection of the galvanometer with respect to its original orientation when adjusting the optical path. By knowing the first position of the first picture on the display screen, the inclination angle of the vibrating mirror to be adjusted can be calculated so as to ensure that the display content can be accurately projected or scanned to the corresponding position.
S403, controlling the vibrating mirror to incline to the inclination angle so that the relative position of the first picture and the display screen is the initial position.
In the embodiment of the application, the projection or scanning direction of the picture can meet the specific relative position requirement by adjusting the inclination angle of the vibrating mirror. The adjustment of the inclination angle is realized by an adjusting mechanism or a driver of the vibrating mirror. The relative position refers to the position of the first picture on the display screen, and the position and the direction of the projection image on the display screen can be controlled by adjusting the angle of the vibrating mirror, so that the first picture returns to the initial position from the first position.
Illustratively, a sensor or algorithm is used to detect in real time a first position of a first frame on a display screen and obtain its pixel coordinates. And calculating the inclination angle of the vibrating mirror to be adjusted by comparing the difference between the first position and the initial position, and applying the calculated inclination angle to an adjusting mechanism of the vibrating mirror to dynamically adjust the adjusting mechanism to a corresponding inclination state. For example, a pixel point on the liquid crystal panel is shifted to the right by 2 pixels, then the inclination angle of the galvanometer is required to be obtained according to the position of the pixel point after the movement and the initial position, and the galvanometer is adjusted to the obtained inclination angle, so that the first picture is shifted to the left by two pixel points, namely, the position of the first picture on the display screen is returned to the initial position again.
In the method, the liquid crystal panel is combined with the galvanometer through the image display of the liquid crystal panel, so that the liquid crystal panel has no residual shadow, projects a picture and can maintain the original position unchanged.
In one embodiment, as shown in fig. 3, a flow chart for acquiring an inclination angle according to an embodiment of the present application is shown, and step S402 includes:
s501, acquiring a first distance of the first picture moving relative to the display screen according to the first position.
In the embodiment of the present application, the first distance is a length of a position (first position) of the pixel point after movement relative to an initial position before movement. By comparing the difference between the first position and the initial position, the distance (first distance) that the first screen moves relative to the display screen is calculated. This typically involves converting pixel coordinates to actual distances or otherwise quantifying the distances.
In some implementations, the distance of each movement of the pixel point may be defined according to a first rule, for example, the pixel point is moved two pixel points to the right each time, and the first distance may be obtained by first obtaining the width a of the pixel point, and then in this example, the first distance is a×2.
In other implementations, a camera or other sensor is used to monitor the position of the first screen on the display screen in real time. This may be accomplished by calculating pixel coordinates or other location information. And comparing the coordinates of the first position and the initial position, and calculating the distance of the relative movement. This can be achieved by subtracting the coordinate values of the initial position to obtain the displacement of the picture relative to the display screen. For example, if the initial position coordinate of a certain pixel point is (0, 0), and the moved first position coordinate is (5, 0), the difference of the pixel coordinates is (5, 0), and finally the difference of the pixel coordinates is converted into the actual distance, a specific conversion formula or a calibration process may be used. This ensures that the measurement of the distance coincides with the actual movement of the physical space.
According to the method, the actual distance of the first picture moving relative to the display screen can be obtained according to the first position, and a basis is provided for dynamic adjustment and interactive experience.
S502, acquiring optical parameters of the galvanometer.
In an embodiment of the present application, the optical parameters include a lens thickness and a refractive index of the galvanometer.
In the embodiment of the present application, as shown in fig. 4, a schematic diagram of the vibrating mirror principle provided in the embodiment of the present application is shown in fig. 4, where t refers to the thickness of the vibrating mirror lens, and is generally expressed in units of length (such as millimeters or centimeters). The size of the lens thickness directly affects the optical path and phase adjustment capability of the galvanometer in the optical system. n is the refractive index of the galvanometer, the refractive index n refers to the refractive property of light rays when passing through the galvanometer material, and is the ratio of the refractive angle of the light rays to the incident angle, so that the speed and the bending degree of the light rays when propagating in the galvanometer are determined, and the imaging and focusing performance of an optical system are greatly influenced. Δy is the distance by which the mirror deflects the screen, and Δy can be determined by determining the tilt angle θ.
These optical parameters are typically found in specifications tables of galvanometers or in documents provided by manufacturers. For example, for optical galvanometers commonly used in optical laboratories, the lens thickness and refractive index information is generally detailed in the product specifications or technical manuals.
S503, acquiring the inclination angle of the vibrating mirror according to the first distance and the optical parameter.
In some embodiments, S503 may include: and determining an inclination direction according to the moving direction of the pixel points in the first rule, wherein the inclination direction is opposite to the moving direction of the pixel points in the first rule, and determining an inclination angle according to the moving distance of the pixel points in the first rule and the inclination direction.
In some embodiments, the tilt angle may be determined by using directional information of the beam reflected by the galvanometer to infer the tilt angle of the object. This is typically accomplished by measuring the position or intensity of the reflected beam on the galvanometer surface. When the galvanometer is tilted from the beam, the position or intensity of the reflected beam may be changed, which may be used to calculate the tilt angle of the object relative to the galvanometer, wherein the calculation of the tilt angle involves optical parameters of the galvanometer, etc.
Illustratively, the tilt angle of the galvanometer can be calculated according to the following formula:
After light passes through glass on the vibrating mirror, refraction caused by inclination: and determining the inclination angle theta to determine delta y, namely the distance of the vibrating mirror for shifting the picture. When deltay is equal to the width of X pixel points on the liquid crystal panel and the directions are opposite, the effect that the liquid crystal panel has no residual shadow and projects a picture and the original position is kept unchanged can be realized.
For example, if the pixels on the liquid crystal panel move by 2 pixels and the width of each pixel is 1, the first distance is x1= 2*1 =2, and Δy=2 if the magnitude of Δy is equal to and opposite to the first distance, the known Δy and the lens thickness t of the galvanometer have refractive index n, and the known information is substituted into the above formula to calculate the precise tilt angle.
In the method, the offset of the picture can be controlled by precisely controlling the inclination angle, so that the projection picture can maintain the original position unchanged.
In one embodiment, the method further comprises:
And determining the vibration frequency of the vibrating mirror according to the display frequency.
In the embodiment of the application, the vibration frequency of the vibrating mirror is the number of times the vibrating mirror completes in unit time, and is usually expressed in units of hertz (Hz).
In some implementations, since the vibrating mirror is mounted on the front side of the display screen, the vibration frequency of the vibrating mirror can be equal to the display frequency of the display screen, so as to ensure that the vibration of the vibrating mirror is synchronous with the refreshing of the display screen, and avoid flicker or distortion of the picture.
In other embodiments, the vibration frequency of the vibrating mirror may be different from the display frequency of the display screen, for example, the display frequency is 60Hz, the vibration frequency of the vibrating mirror may be 120Hz or 180Hz, which corresponds to the vibration frequency of the vibrating mirror being set to be a multiple of the display frequency.
In the method, the vibration frequency in the vibrating mirror is matched with the display frequency of the display screen, so that the synchronization of the vibration of the vibrating mirror and the refreshing of the display screen can be ensured, and the flicker or distortion of the picture can be avoided.
In an embodiment, referring to fig. 5, a schematic structural diagram of a display module according to an embodiment of the present application is shown. By way of example and not limitation, as shown in fig. 5, the display module 5 includes:
a display screen 51 for displaying images of the method for eliminating screen afterimage according to the embodiment of fig. 1-4;
and a galvanometer 52 for adjusting the position of the picture relative to the display screen.
In embodiments of the present application, the display screen is used to display pictures, typically by a display, projector or other display device. Its main function is to convert an input image or video signal into a viewable image and display it on a screen for viewing and interactive use.
A galvanometer is an optical element used to adjust the position of a picture relative to a display screen. Is mounted on the front side of the display screen and changes the optical path, typically by reflecting or refracting light, to adjust the position or angle of the picture on the display screen. The working principle of the vibrating mirror is based on the reflection and refraction rules of light. The direction and angle of the light can be changed by adjusting the inclination angle or the position of the vibrating mirror, so that the position or the projection direction of the picture on the display screen can be adjusted. Galvanometer mirrors typically have an adjustable tilt angle or rotation mechanism to achieve precise control of the position of the picture.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
Fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present application. As shown in fig. 6, the terminal device 6 of this embodiment includes: at least one processor 60 (only one shown in fig. 6), a memory 61 and a computer program 62 stored in the memory 61 and executable on the at least one processor 60, the processor 60 implementing the steps in any of the various ghost cancellation method embodiments described above when executing the computer program 62.
The terminal equipment can be computing equipment such as a desktop computer, a notebook computer, a palm computer, a cloud server and the like. The terminal device may include, but is not limited to, a processor, a memory. It will be appreciated by those skilled in the art that fig. 6 is merely an example of the terminal device 6 and is not meant to be limiting as to the terminal device 6, and may include more or fewer components than shown, or may combine certain components, or different components, such as may also include input-output devices, network access devices, etc.
The Processor 60 may be a central processing unit (Central Processing Unit, CPU), the Processor 60 may also be other general purpose processors, digital signal processors (DIGITAL SIGNAL processors, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), off-the-shelf Programmable gate array (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 61 may in some embodiments be an internal storage unit of the terminal device 6, such as a hard disk or a memory of the terminal device 6. The memory 61 may in other embodiments also be an external storage device of the terminal device 6, such as a plug-in hard disk provided on the terminal device 6, a smart memory card (SMART MEDIA CARD, SMC), a Secure Digital (SD) card, a flash memory card (FLASH CARD) or the like. Further, the memory 61 may also include both an internal storage unit and an external storage device of the terminal device 6. The memory 61 is used for storing an operating system, an application program, a Boot Loader (Boot Loader), data, other programs, etc., such as program codes of the computer program. The memory 61 may also be used for temporarily storing data that has been output or is to be output.
Embodiments of the present application also provide a computer readable storage medium storing a computer program which, when executed by a processor, performs the steps of the respective method embodiments described above.
Embodiments of the present application provide a computer program product enabling a terminal device to carry out the steps of the method embodiments described above when the computer program product is run on the terminal device.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above embodiments, and may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include at least: any entity or device capable of carrying computer program code to an apparatus/terminal device, recording medium, computer Memory, read-Only Memory (ROM), random access Memory (RAM, random Access Memory), electrical carrier signals, telecommunications signals, and software distribution media. Such as a U-disk, removable hard disk, magnetic or optical disk, etc. In some jurisdictions, computer readable media may not be electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other manners. For example, the apparatus/terminal device embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical function division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A method for eliminating screen afterimage, which is applied to a display screen, the method comprising:
Detecting the display time of the display screen for displaying the first picture;
and if the display time length reaches a first preset time length, controlling the display screen to display the first picture according to a first rule, wherein the first rule is that the relative position of the first picture relative to the display screen is changed from an initial position to a first position, and then the first position returns to the initial position.
2. The method for eliminating screen residual shadow according to claim 1, wherein controlling the display screen to display the first picture according to a first rule comprises:
Acquiring the display frequency of the display screen;
And controlling the display screen to display the first picture according to a first rule according to the display frequency.
3. The method for eliminating screen residual shadow according to claim 2, wherein controlling the display screen to display the first picture according to the first rule according to the display frequency comprises:
Acquiring a second preset time length according to the display frequency;
And controlling the display screen to display the first picture according to a first rule every second preset time.
4. The method for eliminating screen residual shadow according to claim 3, wherein said obtaining a second preset time period according to the display frequency comprises:
Determining a display period of the display screen according to the display frequency;
And determining the second preset time length according to the display period.
5. The screen ghost elimination method according to claim 1, wherein said display screen is provided with a vibrating mirror, said method further comprising:
acquiring a first position of the first picture relative to the display screen;
acquiring the inclination angle of the vibrating mirror according to the first position;
And controlling the vibrating mirror to incline to the inclination angle so that the relative position of the first picture and the display screen is the initial position.
6. The method of claim 5, wherein the obtaining the tilt angle of the galvanometer according to the first position comprises:
Acquiring a first distance of the first picture moving relative to the display screen according to the first position;
Acquiring optical parameters of the vibrating mirror;
And acquiring the inclination angle of the vibrating mirror according to the first distance and the optical parameter.
7. The ghost elimination method according to claim 5, wherein said method further comprises:
And determining the vibration frequency of the vibrating mirror according to the display frequency of the display screen.
8. A display module, comprising:
a display screen for displaying a picture according to the method of any one of claims 1 to 7;
And the vibrating mirror is used for adjusting the position of the picture relative to the display screen.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1 to 7 when executing the computer program.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the method according to any one of claims 1 to 7.
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