CN114038362A - Residual image detection method, device and system for curved surface display screen - Google Patents
Residual image detection method, device and system for curved surface display screen Download PDFInfo
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Abstract
The application provides a method, a device and a system for detecting an afterimage of a curved surface display screen, relates to the technical field of display, and is used for solving the technical problem of low accuracy of the afterimage detection of the curved surface display screen. The afterimage detection method comprises the following steps: selecting a first area and a second area, dividing the first area into a plurality of first sub-areas along the bending direction of the central line, and dividing the second area into a plurality of second sub-areas; when the curved surface display screen displays a preset gray scale picture, acquiring initial brightness values of all the first sub-areas and initial brightness values of all the second sub-areas; and when the curved surface display screen is switched from the preset gray scale picture to the residual image detection picture and is switched back to the preset gray scale picture, acquiring the actual brightness values of all the first sub-areas and the actual brightness values of all the second sub-areas. By dividing the plurality of sub-regions, each sub-region can be focused clearly, the accuracy of the acquired brightness data is improved, and the accuracy of the afterimage detection is improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a method, a device and a system for detecting residual images of a curved surface display screen.
Background
With the development of display technology, the demand of people for the Image quality of the display screen is increasing, and the improvement of the Image quality of the display screen is influenced and restricted by the afterimage (Image Sticking). The afterimage is an image or a contour of a previous static image when the previous static image is displayed for a period of time and a next static image is displayed. For this reason, the afterimage of the display screen needs to be detected to judge the afterimage level of the display screen.
When the display screen carries out the residual image detection, the display screen is photographed to obtain the brightness data of a specific area in the display screen. However, when the display screen is a curved display screen, the accuracy of the luminance data acquired during photographing is low, and the accuracy of the afterimage detection is low.
Disclosure of Invention
In view of the foregoing problems, embodiments of the present application provide a method, an apparatus, and a system for detecting an afterimage of a curved display screen, which are used to improve accuracy of detecting an afterimage of a curved display screen.
In order to achieve the above object, the embodiments of the present application provide the following technical solutions:
a first aspect of an embodiment of the present application provides a method for detecting an afterimage of a curved surface display screen, including: selecting a first area and a second area, wherein the first area and the second area are symmetrically distributed relative to the center line of the curved surface display screen, and the bending direction of the center line is parallel to the bending direction of the curved surface display screen;
dividing the first region into a plurality of first sub-regions and the second region into a plurality of second sub-regions along a bending direction of the center line;
when the curved surface display screen displays a preset gray scale picture, acquiring initial brightness values of all the first sub-areas and initial brightness values of all the second sub-areas;
when the curved surface display screen is switched from the preset gray scale picture to a residual image detection picture and is switched back to the preset gray scale picture from the residual image detection picture, acquiring actual brightness values of all the first sub-areas and actual brightness values of all the second sub-areas;
obtaining residual image parameters of the curved surface display screen according to the initial brightness value and the actual brightness value of each first sub-area and the initial brightness value and the actual brightness value of each second sub-area;
and determining the residual image level of the curved surface display screen according to the residual image parameters.
According to the method for detecting the afterimage of the curved surface display screen, the first area is divided into the plurality of first sub-areas along the bending direction of the central line of the curved surface display screen, the second area is divided into the plurality of second sub-areas along the bending direction of the curved surface display screen, so that the first area of the curved surface is divided into the plurality of first sub-areas which are approximately planar, and the second area of the curved surface is divided into the plurality of second sub-areas which are approximately planar.
In a possible implementation manner, when the curved display screen is switched from a preset gray scale picture to an afterimage detection picture, the picture gray scale displayed in the first area, the picture gray scale displayed in the second area, and the gray scale of the preset gray scale picture are different from each other.
In a possible implementation manner, the gray scale of the image displayed in the first area is smaller than the gray scale of the preset gray scale image, and the gray scale of the image displayed in the second area is larger than the gray scale of the preset gray scale image.
In a possible implementation manner, a plurality of the first sub-regions correspond to a plurality of the second sub-regions one to one
In a possible implementation manner, an initial brightness value of each first sub-region and the second sub-region corresponding thereto are obtained simultaneously, and an actual brightness value of each first sub-region and the second sub-region corresponding thereto are obtained simultaneously.
In a possible implementation manner, when the curved display screen is switched from the preset grayscale picture to the afterimage detection picture and is switched back to the preset grayscale picture, the step of obtaining the actual brightness values of all the first sub-regions and the actual brightness values of all the second sub-regions includes: the curved surface display screen is switched from the preset gray scale picture to a residual image detection picture, and after the residual image detection picture is switched back to the preset gray scale picture, the actual brightness values of all the first sub-areas and the actual brightness values of all the second sub-areas at multiple moments are obtained;
the step of obtaining the residual image parameter of the curved surface display screen according to the initial brightness value and the actual brightness value of each first sub-region and the initial brightness value and the actual brightness value of each second sub-region comprises: and acquiring residual image parameters of the curved surface display screen at a plurality of moments after the curved surface display screen is switched back to the preset gray scale picture according to the initial brightness value and the actual brightness value of each first sub-area and the initial brightness value and the actual brightness value of each second sub-area until the residual image parameters are less than or equal to a preset value.
In a possible implementation manner, the calculation formula of the afterimage parameter is:
wherein IS IS afterimage parameter, I (t)AIs the actual luminance value of the first region, I (t)BIs the actual brightness value of the second region, I (0)AIs the initial brightness value of the first region, I (0)BIs the initial brightness value of the second area; the actual brightness value of the first region is obtained according to the actual brightness value of each first sub-region, the actual brightness value of the second region is obtained according to the actual brightness value of each second sub-region, the initial brightness value of the first region is obtained according to the initial brightness value of each first sub-region, and the initial brightness value of the second region is obtained according to the initial brightness value of each second sub-region.
Preferably, the initial brightness value of the first region is an arithmetic average of the initial brightness values of all the first sub-regions, and the actual brightness value of the first region is an arithmetic average of the actual brightness values of all the first sub-regions; the initial brightness value of the second region is an arithmetic average of the initial brightness values of all the second sub-regions, and the actual brightness value of the second region is an arithmetic average of the actual brightness values of all the second sub-regions.
In a possible implementation manner, along the bending direction of the central line, the ratio of the length of the first sub-region to the length of the pixel unit of the curved surface display screen is greater than or equal to the ratio of the resolution of the curved surface display screen to the resolution of the image acquisition device; along the bending direction of the central line, the ratio of the length of the second sub-area to the length of the pixel unit of the curved surface display screen is greater than or equal to the ratio of the resolution of the curved surface display screen to the resolution of the image acquisition device.
A second aspect of the embodiments of the present application provides an afterimage detection apparatus for a curved surface display screen, including: the partition module is used for selecting a first area and a second area, the first area and the second area are symmetrically distributed relative to a center line of the curved surface display screen, the bending direction of the center line is parallel to the bending direction of the curved surface display screen, the first area is divided into a plurality of first sub-areas along the bending direction of the center line, and the second area is divided into a plurality of second sub-areas; the control module is used for controlling the curved surface display screen to display a preset gray scale picture, controlling the curved surface display screen to be switched from the preset gray scale picture to a residual image detection picture and switching the residual image detection picture back to the preset gray scale picture; the brightness acquisition module is used for acquiring initial brightness values and actual brightness values of all the first sub-regions and acquiring initial brightness values and actual brightness values of all the second sub-regions; the processing module is used for obtaining the residual image parameters of the curved surface display screen according to the initial brightness value and the actual brightness value of each first sub-area and the initial brightness value and the actual brightness value of each second sub-area; and determining the residual image level of the curved surface display screen according to the residual image parameters.
The device for detecting the residual image of the curved-surface display screen, provided by the embodiment of the application, divides the first area into the plurality of first sub-areas along the bending direction of the center line of the curved-surface display screen through the partitioning module, and divides the second area into the plurality of second sub-areas along the bending direction of the curved-surface display screen, so that the first area of the curved surface is divided into the plurality of first sub-areas which are approximately planar, and the second area of the curved surface is divided into the plurality of second sub-areas which are approximately planar, so that when the brightness acquisition module acquires the initial brightness value and the actual brightness value of each sub-area, focusing on each sub-area is clear, the accuracy of the brightness data acquired by each sub-area is improved, and the accuracy of the residual image detection of the curved-surface display screen is improved.
A third aspect of the embodiments of the present application provides an afterimage detection system for a curved display screen, including: the curved surface display screen comprises a first area and a second area, wherein the first area and the second area are symmetrically distributed relative to the center line of the curved surface display screen, and the bending direction of the center line is parallel to that of the curved surface display screen; the first area is divided into a plurality of first sub-areas along the bending direction of the central line, and the second area is divided into a plurality of second sub-areas; the controller is electrically connected with the curved surface display screen and is used for controlling the curved surface display screen to display a preset gray scale picture, controlling the curved surface display screen to be switched from the preset gray scale picture to a residual image detection picture and switching the residual image detection picture back to the preset gray scale picture; the image acquisition device is used for acquiring initial brightness values and actual brightness values of all the first sub-regions and acquiring initial brightness values and actual brightness values of all the second sub-regions; the processor is in signal connection with the image acquisition device and is used for obtaining the residual image parameters of the curved surface display screen according to the initial brightness value and the actual brightness value of each first sub-region and the initial brightness value and the actual brightness value of each second sub-region; and determining the residual image level of the curved surface display screen according to the residual image parameters.
In the afterimage detection system of the curved surface display screen in the embodiment of the application, the image acquisition device is used for acquiring images and acquiring brightness of a plurality of first sub-areas divided along the bending direction of the central line of the curved surface display screen, and acquiring images and acquiring brightness of a plurality of second sub-areas divided along the bending direction of the curved surface display screen, so that the image acquisition device can clearly focus each first sub-area and each second sub-area, the accuracy of brightness data acquired by each first sub-area and each second sub-area is improved, and the accuracy of afterimage detection of the curved surface display screen is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a top view of a curved display screen in an embodiment of the present application;
FIG. 2 is a side view of a curved display screen in an embodiment of the present application;
FIG. 3 is a flowchart illustrating a method for detecting an afterimage of a curved display screen according to an embodiment of the present disclosure;
FIG. 4 is a schematic view of a first region and a second region in an embodiment of the present application;
FIG. 5 is a schematic view of a first sub-region and a second sub-region in an embodiment of the present application;
FIG. 6 is a schematic diagram illustrating a curved display screen displaying a preset gray scale screen according to an embodiment of the present disclosure;
FIG. 7 is a schematic diagram illustrating a curved display screen displaying an afterimage detection screen according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of an afterimage detection system of a curved display screen in an embodiment of the present application.
Description of reference numerals:
10-curved surface display screen; 20-afterimage detection system;
21-a controller; 22-an image acquisition device;
23-processor.
Detailed Description
As described in the background art, the curved display screen in the related art has a problem of low accuracy of detecting an afterimage, and the inventor has found that the reason is that the curved display screen has a radian, and when an image of a specific area in the curved display screen is acquired by an image acquisition device, the image acquisition device focuses on a part of the specific area clearly, and the other part of the specific area is focused fuzziness, so that the accuracy of luminance data acquired according to the image is low, and the accuracy of detecting the afterimage is low.
In view of the above technical problems, in the method for detecting an afterimage of a curved surface display screen provided in the embodiment of the present application, the first region is divided into a plurality of first sub-regions along the bending direction of the center line of the curved surface display screen, and the second region is divided into a plurality of second sub-regions along the bending direction of the center line of the curved surface display screen, so that the first region of the curved surface is divided into a plurality of first sub-regions that are approximate planes, and the second region of the curved surface is divided into a plurality of second sub-regions that are approximate planes, so that when an initial brightness value and an actual brightness value of each sub-region are obtained, each focusing sub-region can be clear, the accuracy of brightness data obtained by each sub-region is improved, and the accuracy of detecting an afterimage of the curved surface display screen is improved.
In order to make the aforementioned objects, features and advantages of the embodiments of the present application more comprehensible, embodiments of the present application are described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a method for detecting residual images of a curved surface display screen, wherein the curved surface display screen 10 can be applied to products with display functions such as televisions, mobile phones and vehicle-mounted displays. Referring to fig. 1 and 2, the curved display screen 10 is a curved surface, and the front surface of the curved display screen 10 is used for displaying pictures, that is, the front surface of the curved display screen 10 is a light emitting side, and the curved display screen is concave towards the back surface. As shown in fig. 2, the surface on the right side of the curved display screen 10 is a front surface, the curved display screen 10 is concave towards the left side, and the bending direction of the curved display screen 10 may refer to the bending direction of the front surface of the curved display screen 10, which is indicated by an arrow in fig. 2.
Referring to fig. 3, the method for detecting an afterimage of a curved display screen in the embodiment of the present application may include the following steps:
step S101: and selecting a first area and a second area, wherein the first area and the second area are symmetrically distributed relative to the center line of the curved surface display screen, and the bending direction of the center line is parallel to the bending direction of the curved surface display screen.
With continued reference to fig. 1 and 2, the curved display screen 10 has a centerline that is located within the front face of the curved display screen 10, the centerline of the curved display screen 10 being shown in dashed lines at I-I in fig. 1 and 2. As shown in fig. 2, the central line of the curved display screen 10 is an arc line, the bending direction of the central line is parallel to the bending direction of the curved display screen 10, and the radian of the central line is the same as the radian of the curved display screen 10 in the bending direction.
Referring to fig. 4, a first area and a second area are selected on the curved display screen 10, and the first area and the second area are acquisition areas, that is, luminance data of the first area and the second area are acquired subsequently. The first area and the second area are partial areas on the curved display screen, and the first area and the second area are symmetrical relative to the central line of the curved display screen 10, namely the first area and the second area are axisymmetric. As shown in fig. 4, the first area and the second area are respectively located on two sides of the center line, and exemplarily, the first area is located on the left side of the center line, and the second area is located on the right side of the center line, i.e., the first area is shown as a in fig. 4, and the second area is shown as B in fig. 4.
The first region and the second region have the same shape, the first region and the second region are cambered surfaces, and orthographic projections of the first region and the second region on the plane shown in fig. 4 are polygonal, such as rectangles. The first area and the second area can be in other shapes according to different detection requirements.
In one possible example, the bending direction of the curved display screen 10 is a length direction, and the direction perpendicular to the bending direction of the curved display screen 10 is a width direction (X direction shown in fig. 4), that is, the long side of the curved display screen 10 is an arc line, and the short side of the curved display screen 10 is a straight line. As shown in fig. 4, the length H1 of the first region is equal to the length H2 of the second region, for example, equal to 40% of the length H of the curved display screen 10. The width V1 of the first area is equal to the width V2 of the second area, for example equal to 10% of the width V of the curved display screen 10. The distance L between the first and second regions may be 1 mm.
Step S102: the first region is divided into a plurality of first sub-regions and the second region is divided into a plurality of second sub-regions along the bending direction of the center line.
Referring to fig. 5, the first region is divided into a plurality of first sub-regions and the second region is divided into a plurality of second sub-regions along the bending direction of the center line, i.e., along the bending direction of the curved display screen 10. Along the orientation shown in fig. 5, the first sub-regions are a1, a2, … … and Ai from bottom to top, and the second sub-regions are B1, B2, … … and Bi from bottom to top. It should be noted that the number of the first sub-regions may be different from the number of the second sub-regions.
The length of the first sub-region and the length of the second sub-region along the bending direction of the curved display screen 10 are both related to the pixel resolution of the image acquisition device and the pixel resolution of the curved display screen 10. The image acquisition device can include shooting device and image processing apparatus, and the shooting device is used for shooing curved surface display screen, and image processing apparatus obtains luminance data according to the photo of gathering. The camera may be a face scanning camera, such as an LMK face scanning camera.
In some possible examples, along the bending direction of the curved display screen 10 (i.e. the bending direction of the center line), the ratio of the length D1 of the first sub-region to the length of the pixel unit of the curved display screen 10 is greater than or equal to the ratio of the resolution of the curved display screen 10 to the resolution of the image acquisition device; the ratio of the length D2 of the second sub-region to the length of the pixel unit of the curved display screen 10 along the bending direction of the curved display screen 10 (i.e. the bending direction of the central line) is greater than or equal to the ratio of the resolution of the curved display screen 10 to the resolution of the image acquisition device.
For example, if the ratio of the resolution of the curved display screen 10 to the resolution of the image capturing device is 2, the length of the first sub-area is equal to the length of 2 pixel units. By the arrangement, the definition of the images of the first sub-area and the second sub-area collected by the image collecting device can be ensured, so that the accuracy of brightness data is improved.
Step S103: and when the curved surface display screen displays a preset gray scale picture, acquiring initial brightness values of all the first sub-areas and initial brightness values of all the second sub-areas.
Referring to fig. 6, the curved display screen 10 can display 255-level gray scales, wherein the highest gray scale of the curved display screen 10 is 255 and the lowest gray scale of the curved display screen 10 is 0. The gray level of the predetermined gray level frame may be any gray level between the highest gray level and the lowest gray level, for example, the gray level of the predetermined gray level frame may be 48, or the gray level of the predetermined gray level frame may be 127.
When the curved surface display screen 10 displays a preset gray scale picture, the first area and the second area are both preset gray scale pictures, at this time, each first sub-area and each second sub-area are photographed by using an image acquisition device, and initial brightness values of each first sub-area and each second sub-area are obtained through image processing software and the like.
Specifically, the curved surface display screen 10 is placed on the microscope stage, an image acquisition device is arranged on one side of the curved surface display screen 10, which is far away from the microscope stage, and the first area and the second area are located below the image acquisition device. By adjusting the distance between the curved-surface display screen 10 and the image acquisition device, the position of the curved-surface display screen 10 on the stage, and the pixel resolution (Pixels Per inc, abbreviated as PPI) of the image acquisition device, the image acquisition device can focus clearly on the sub-region to be acquired. It will be appreciated that the arc of each sub-region along the direction of curvature of the curved display screen 10 is small and each sub-region may be considered approximately as a plane. When each subregion is subjected to image acquisition, the whole image obtained by the image acquisition device is clearer, so that the accuracy of acquiring the brightness data of each subregion is improved.
Referring to fig. 4 to 6, the initial luminance values of all the first sub-regions may be sequentially obtained from a1 to Ai when the initial luminance values of all the first sub-regions are obtained, and the initial luminance values of all the second sub-regions may be sequentially obtained from B1 to Bi when the initial luminance values of all the second sub-regions are obtained.
In a possible embodiment, the center line of the curved display screen 10 is parallel to the bending direction of the curved display screen 10, and the plurality of first sub-regions and the plurality of second sub-regions correspond to each other one by one. As shown in fig. 4 and 5, each first sub-region is the same as its corresponding second sub-region, and the first sub-region and its corresponding second sub-region are located within the same arc range. When the initial brightness values of all the first sub-regions and the initial brightness values of all the second sub-regions are obtained, the initial brightness values of each first sub-region and the corresponding second sub-region may be obtained simultaneously, and when the actual brightness values of all the first sub-regions and the actual brightness values of all the second sub-regions are obtained subsequently, the actual brightness values of each first sub-region and the corresponding second sub-region may be obtained simultaneously. That is, the luminance data of a1 and B1, the luminance data of a2 and B2, and the luminance data of … …, Ai, and Bi can be acquired at the same time to simplify the steps of the afterimage detection method and improve the detection efficiency.
It can be understood that, when the curved display screen 10 displays the preset gray-scale picture, the preset gray-scale picture is maintained for a period of time, and at least after the initial brightness values of all the first sub-regions and the initial brightness values of all the second sub-regions are obtained, the next step is performed. The shorter the time for keeping the preset gray scale picture is, the better the residual image detection accuracy is improved.
Step S104: and when the curved surface display screen is switched from the preset gray scale picture to the residual image detection picture and is switched back to the preset gray scale picture from the residual image detection picture, acquiring the actual brightness values of all the first sub-areas and the actual brightness values of all the second sub-areas.
Referring to fig. 7, the curved display screen 10 is switched from a predetermined gray scale frame to an afterimage detection frame, and the afterimage detection frame is maintained for a period of time. Illustratively, when short-term afterimage detection is performed on the curved display screen 10, the afterimage detection screen is maintained for several seconds, for example, 10 s. When the curved display screen 10 is subjected to the middle-term afterimage detection, the afterimage detection picture is kept for several minutes, for example, 10 min.
When the curved display screen 10 displays the afterimage detection picture, the picture gray scale displayed in the first area, the picture gray scale displayed in the second area and the gray scale of the preset gray scale picture are different from each other. Preferably, the gray scale of the image displayed in the first area is smaller than the gray scale of the image with the preset gray scale, and the gray scale of the image displayed in the second area is larger than the gray scale of the image with the preset gray scale.
In some possible examples, when the curved display screen 10 displays the afterimage detection picture, the curved display screen 10 located at one side of the center line displays a first pure color picture, and the curved display screen 10 located at the other side of the center line displays a second pure color picture. The gray scale of the first pure color picture is 0, the gray scale of the second pure color picture is 255, namely the residual image detection picture is a picture with half black and half white. By the arrangement, the gray scale difference between the image gray scale displayed by the first area and the image gray scale displayed by the second area is the largest, so that the contrast of residual images of the two areas when a preset gray scale image is subsequently displayed is improved, and the residual image detection is facilitated.
The curved display screen 10 is then switched back to the predetermined gray scale image from the afterimage detection image. It can be understood that the preset gray scale picture refers to a parameter picture input into the curved surface display screen 10, that is, an ideal picture, when the curved surface display screen 10 is switched back to the preset gray scale picture, an actual image displayed by the curved surface display screen 10 is not a simple preset gray scale picture, and a residual image of a residual image detection picture also exists. At this time, the actual luminance values of all the first sub-regions and the actual luminance values of all the second sub-regions are obtained, wherein the obtaining process of the actual luminance values of the first sub-regions and the actual luminance values of the second sub-regions may refer to the obtaining process of the initial luminance values of the first sub-regions and the initial luminance values of the second sub-regions, which is not described herein again.
Step S105: and obtaining the residual image parameters of the curved surface display screen according to the initial brightness value and the actual brightness value of each first sub-area and the initial brightness value and the actual brightness value of each second sub-area.
According to the initial brightness value and the actual brightness value of each first sub-region and the initial brightness value and the actual brightness value of each second sub-region, the afterimage parameters of the curved display screen 10 can be obtained. The residual image parameter of the curved display screen 10 may be Just Noticeable Difference (JND), and specifically, the residual image parameter of the curved display screen 10 may be calculated by the following formula:
wherein IS IS afterimage parameter, I (t)AIs the actual luminance value of the first region, I (t)BIs the actual brightness value of the second region, I (0)AIs the initial brightness value of the first region, I (0)BIs the initial luminance value of the second region.
The actual brightness value of the first region is obtained according to the actual brightness value of each first sub-region, the actual brightness value of the second region is obtained according to the actual brightness value of each second sub-region, the initial brightness value of the first region is obtained according to the initial brightness value of each first sub-region, and the initial brightness value of the second region is obtained according to the initial brightness value of each second sub-region.
Illustratively, the initial luminance value of the first region is an arithmetic average of the initial luminance values of all the first sub-regions, and the actual luminance value of the first region is an arithmetic average of the actual luminance values of all the first sub-regions. The initial luminance value of the second region is an arithmetic average of the initial luminance values of all the second sub-regions, and the actual luminance value of the second region is an arithmetic average of the actual luminance values of all the second sub-regions. Of course, the initial luminance value and the actual luminance value of the first region, and the initial luminance value and the actual luminance value of the second region may also be other parameters, such as a median.
In a possible embodiment of the present application, when the curved display screen is switched from the preset gray-scale picture to the afterimage detection picture and the afterimage detection picture is switched back to the preset gray-scale picture, the step of obtaining the actual brightness values of all the first sub-regions and the actual brightness values of all the second sub-regions includes: and after the residual image detection picture is switched back to the preset gray scale picture, the actual brightness values of all the first sub-areas and the actual brightness values of all the second sub-areas at multiple moments are continuously acquired.
Correspondingly, the step of obtaining the afterimage parameter of the curved surface display screen according to the initial brightness value and the actual brightness value of each first sub-region and the initial brightness value and the actual brightness value of each second sub-region comprises: and continuously acquiring residual image parameters of the curved surface display screen at a plurality of moments after the curved surface display screen is switched back to the preset gray scale picture according to the initial brightness value and the actual brightness value of each first sub-region and the initial brightness value and the actual brightness value of each second sub-region until the residual image parameters are less than or equal to the preset value.
That is, after the curved display screen 10 is switched back to the preset gray scale frame, the actual brightness values at n moments are continuously obtained to calculate the afterimage parameters at the n moments. The interval between these n moments is the time required for the curved display screen 10 to capture the first area and the second area. And gradually reducing the residual image parameter along with the gradual increase of the n moments, and stopping collecting when the residual image parameter is reduced to be lower than a preset value, wherein the residual image parameter is the nth residual image parameter.
For example, the preset value may be 1.6 × 0.004, when the curved display screen 10 is switched back to the preset grayscale picture, the time required for acquiring each first sub-region and each second sub-region is t, and the difference between n times is t, so as to continuously obtain the actual luminance values of the first region and the second region, and calculate the afterimage parameter. When the afterimage parameter is reduced to 1.6 × 0.004, the acquisition is stopped, the afterimage parameter is the nth afterimage parameter, and the smaller the nth moment corresponding to the afterimage parameter is, the faster the afterimage elimination rate of the curved surface display screen 10 is.
Step S106: and determining the residual image level of the curved surface display screen according to the residual image parameters.
According to the afterimage parameter and the time corresponding to the afterimage parameter, the afterimage level of the curved display screen 10 can be determined. The smaller the afterimage parameter is, or the smaller the moment corresponding to the afterimage parameter being reduced to the preset value is, the lower the afterimage level is.
According to the method for detecting the afterimage of the curved surface display screen 10 provided by the embodiment of the application, the first area is divided into the plurality of first sub-areas along the bending direction of the curved surface display screen 10, and the second area is divided into the plurality of second sub-areas along the bending direction of the center line of the curved surface display screen 10, so that the first area of the curved surface is divided into the plurality of first sub-areas which are approximately planar, and the second area of the curved surface is divided into the plurality of second sub-areas which are approximately planar, so that when the initial brightness value and the actual brightness value of each sub-area are obtained, each sub-area can be focused clearly, the accuracy of the brightness data obtained by each sub-area is improved, and the accuracy of the afterimage detection of the curved surface display screen 10 is improved.
The embodiment of the application provides a residual image detection device of a curved surface display screen, which comprises a partitioning module, a control module, a brightness acquisition module and a processing module.
The partitioning module is used for selecting a first area and a second area, the first area and the second area are symmetrically distributed relative to a center line of the curved surface display screen 10, and the bending direction of the center line is parallel to the bending direction of the curved surface display screen 10; along the bending direction of the central line, the first area is divided into a plurality of first sub-areas, and the second area is divided into a plurality of second sub-areas.
The control module is used for controlling the curved surface display screen 10 to display a preset gray scale picture, and controlling the curved surface display screen 10 to switch from the preset gray scale picture to the residual image detection picture and to switch from the residual image detection picture back to the preset gray scale picture.
The brightness obtaining module is used for obtaining the initial brightness value and the actual brightness value of all the first sub-areas and obtaining the initial brightness value and the actual brightness value of all the second sub-areas.
The processing module is used for obtaining the residual image parameters of the curved surface display screen 10 according to the initial brightness value and the actual brightness value of each first sub-area and the initial brightness value and the actual brightness value of each second sub-area; and determining the afterimage level of the curved display screen 10 according to the afterimage parameters.
The device for detecting the afterimage of the curved surface display screen 10 provided in the embodiment of the present application, divides the first region into a plurality of first sub-regions along the bending direction of the curved surface display screen 10 through the partitioning module, and divides the second region into a plurality of second sub-regions along the bending direction of the center line of the curved surface display screen 10, so as to divide the first region of the curved surface into a plurality of first sub-regions that are approximately planar, and divide the second region of the curved surface into a plurality of second sub-regions that are approximately planar, so that when the brightness obtaining module obtains the initial brightness value and the actual brightness value of each sub-region, each focusing sub-region can be clear, the accuracy of the brightness data obtained by each sub-region is improved, and the accuracy of the afterimage detection of the curved surface display screen 10 is improved.
The embodiment of the present application further provides an afterimage detection system of a curved surface display screen, referring to fig. 8, the afterimage detection system includes: the device comprises a curved surface display screen 10, a controller 21, an image acquisition device 22 and a processor 23.
The curved display screen 10 comprises a first area and a second area, the first area and the second area are symmetrically distributed relative to a center line of the curved display screen 10, and the bending direction of the center line is parallel to the bending direction of the curved display screen 10; along the bending direction of the central line, the first area is divided into a plurality of first sub-areas, and the second area is divided into a plurality of second sub-areas.
The controller 21 is electrically connected to the curved display screen 10 and configured to control the curved display screen 10 to display a preset gray scale picture, and control the curved display screen 10 to switch from the preset gray scale picture to the afterimage detection picture and switch from the afterimage detection picture back to the preset gray scale picture.
When the curved display screen 10 displays the afterimage detection picture, the picture gray scale displayed in the first area, the picture gray scale displayed in the second area and the gray scale of the preset gray scale picture are different from each other. Preferably, the gray scale of the image displayed in the first area is smaller than the gray scale of the image with the preset gray scale, and the gray scale of the image displayed in the second area is larger than the gray scale of the image with the preset gray scale.
In some possible examples, when the curved display screen 10 displays the afterimage detection picture, the curved display screen 10 located at one side of the center line displays a first pure color picture, and the curved display screen 10 located at the other side of the center line displays a second pure color picture. When the gray scale of the first pure color picture is 0, the first pure color picture is in a full black state, and when the gray scale of the second pure color picture is 255, the second pure color picture is in a white state, namely, the residual image detection picture is a picture which is half black and half white. By the arrangement, the gray scale difference between the image gray scale displayed by the first area and the image gray scale displayed by the second area is the largest, so that the contrast of residual images of the two areas when a preset gray scale image is subsequently displayed is improved, and the residual image detection is facilitated.
The curved display screen 10 is then switched back to the predetermined gray scale image from the afterimage detection image. It can be understood that the preset gray scale picture refers to a parameter picture input into the curved surface display screen 10, that is, an ideal picture, when the curved surface display screen 10 is switched back to the preset gray scale picture, an actual image displayed by the curved surface display screen 10 is not a simple preset gray scale picture, and a residual image of a residual image detection picture also exists.
The image acquisition device 22 is located on the light-emitting side of the curved display screen 10, and is configured to acquire initial luminance values and actual luminance values of all the first sub-regions, acquire initial luminance values and actual luminance values of all the second sub-regions, and transmit luminance data (the initial luminance values and the actual luminance values) to the processor. Illustratively, the image capture device 22 may include a camera for taking a picture of the curved pixel screen and an image processing device for obtaining luminance data from the captured picture. The photographing device may be an area scanning camera.
The processor 23 is in signal connection with the image acquisition device 22, and the processor 23 receives the luminance data transmitted by the image acquisition device 22, acquires the initial luminance value and the actual luminance value of all the first sub-regions, the initial luminance value and the actual luminance value of all the second sub-regions according to the image, and acquires the afterimage parameter of the curved surface display screen 10 according to the initial luminance value and the actual luminance value of each first sub-region, and the initial luminance value and the actual luminance value of each second sub-region. The processor 23 may also determine an afterimage level of the curved display screen 10 based on the afterimage parameter.
In the embodiment of the present application, the afterimage detection system 20 of the curved surface display screen performs image acquisition on a plurality of first sub-regions divided along the bending direction of the center line of the curved surface display screen 10 through the image acquisition device 22, and performs image acquisition on a plurality of second sub-regions divided along the bending direction of the curved surface display screen 10, so that the image acquisition device 22 can clearly focus each first sub-region and each second sub-region, thereby improving the accuracy of the luminance data acquired by each first sub-region and each second sub-region, and further improving the accuracy of the afterimage detection of the curved surface display screen.
The embodiments or implementation modes in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
It should be noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
In general, terms should be understood at least in part by their use in context. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in the singular or may be used to describe a combination of features, structures, or characteristics in the plural, depending, at least in part, on the context. Similarly, terms such as "a" or "the" may also be understood to convey a singular use or to convey a plural use, depending at least in part on the context.
It should be readily understood that "on … …", "above … …" and "above … …" in this disclosure should be interpreted in its broadest sense such that "on … …" means not only "directly on something", but also includes the meaning of "on something" with intervening features or layers therebetween, and "above … …" or "above … …" includes not only the meaning of "above something" or "above" but also includes the meaning of "above something" or "above" with no intervening features or layers therebetween (i.e., directly on something).
Furthermore, spatially relative terms, such as "below," "lower," "above," "upper," and the like, may be used herein for ease of description to describe one element or feature's illustrated relationship to another element or feature. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may have other orientations (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly as well.
The term "substrate" as used herein refers to a material on which a subsequent layer of material is added. The substrate itself may be patterned. The material added atop the substrate may be patterned or may remain unpatterned. In addition, the substrate may comprise a wide range of materials, such as silicon, germanium, gallium arsenide, indium phosphide, and the like. Alternatively, the substrate may be made of a non-conductive material (e.g., glass, plastic, or sapphire wafer, etc.).
The term "layer" as used herein may refer to a portion of material that includes a region having a thickness. A layer may extend over the entire underlying or overlying structure or may have a smaller extent than the underlying or overlying structure. Furthermore, a layer may be a region of a continuous structure, homogeneous or heterogeneous, having a thickness less than the thickness of the continuous structure. For example, a layer may be located between the top and bottom surfaces of the continuous structure or between any pair of lateral planes at the top and bottom surfaces. The layers may extend laterally, vertically, and/or along a tapered surface. The substrate may be a layer, may include one or more layers therein, and/or may have one or more layers located thereon, above and/or below. The layer may comprise a plurality of layers. For example, the interconnect layer may include one or more conductors and contact layers (within which contacts, interconnect lines, and/or vias are formed) and one or more dielectric layers.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A residual image detection method of a curved surface display screen is characterized by comprising the following steps:
selecting a first area and a second area, wherein the first area and the second area are symmetrically distributed relative to the center line of the curved surface display screen, and the bending direction of the center line is parallel to the bending direction of the curved surface display screen;
dividing the first region into a plurality of first sub-regions and the second region into a plurality of second sub-regions along a bending direction of the center line;
when the curved surface display screen displays a preset gray scale picture, acquiring initial brightness values of all the first sub-areas and initial brightness values of all the second sub-areas;
when the curved surface display screen is switched from the preset gray scale picture to a residual image detection picture and is switched back to the preset gray scale picture from the residual image detection picture, acquiring actual brightness values of all the first sub-areas and actual brightness values of all the second sub-areas;
obtaining residual image parameters of the curved surface display screen according to the initial brightness value and the actual brightness value of each first sub-area and the initial brightness value and the actual brightness value of each second sub-area;
and determining the residual image level of the curved surface display screen according to the residual image parameters.
2. The method as claimed in claim 1, wherein when the curved display screen is switched from a predetermined gray-scale frame to a residual image detection frame, the gray scales of the frame displayed in the first region, the gray scales of the frame displayed in the second region and the gray scales of the predetermined gray-scale frame are different from each other.
3. The method as claimed in claim 2, wherein the gray scale of the image displayed in the first region is smaller than the gray scale of the image with the predetermined gray scale, and the gray scale of the image displayed in the second region is larger than the gray scale of the image with the predetermined gray scale.
4. The method as claimed in claim 1, wherein the first sub-regions are in one-to-one correspondence with the second sub-regions.
5. The method as claimed in claim 4, wherein an initial brightness value of each of the first sub-regions and the corresponding second sub-regions is obtained simultaneously, and an actual brightness value of each of the first sub-regions and the corresponding second sub-regions is obtained simultaneously.
6. The method as claimed in claim 4, wherein the step of obtaining the actual brightness values of all the first sub-regions and the actual brightness values of all the second sub-regions when the curved display screen is switched from the pre-defined gray-scale frame to the afterimage detection frame and is switched back from the afterimage detection frame to the pre-defined gray-scale frame comprises:
the curved surface display screen is switched from the preset gray scale picture to a residual image detection picture, and after the residual image detection picture is switched back to the preset gray scale picture, the actual brightness values of all the first sub-areas and the actual brightness values of all the second sub-areas at multiple moments are obtained;
the step of obtaining the residual image parameter of the curved surface display screen according to the initial brightness value and the actual brightness value of each first sub-region and the initial brightness value and the actual brightness value of each second sub-region comprises:
and acquiring residual image parameters of the curved surface display screen at a plurality of moments after the curved surface display screen is switched back to the preset gray scale picture according to the initial brightness value and the actual brightness value of each first sub-area and the initial brightness value and the actual brightness value of each second sub-area until the residual image parameters are less than or equal to a preset value.
7. The method for detecting the afterimage of the curved display screen according to any one of claims 1 to 6, wherein the calculation formula of the afterimage parameter is as follows:
wherein IS IS afterimage parameter, I (t)AIs the actual luminance value of the first region, I (t)BIs the actual brightness value of the second region, I (0)AIs the initial brightness value of the first region, I (0)BIs the initial brightness value of the second area;
the actual brightness value of the first region is obtained according to the actual brightness value of each first sub-region, the actual brightness value of the second region is obtained according to the actual brightness value of each second sub-region, the initial brightness value of the first region is obtained according to the initial brightness value of each first sub-region, and the initial brightness value of the second region is obtained according to the initial brightness value of each second sub-region;
preferably, the initial brightness value of the first region is an arithmetic average of the initial brightness values of all the first sub-regions, and the actual brightness value of the first region is an arithmetic average of the actual brightness values of all the first sub-regions;
the initial brightness value of the second region is an arithmetic average of the initial brightness values of all the second sub-regions, and the actual brightness value of the second region is an arithmetic average of the actual brightness values of all the second sub-regions.
8. The method for detecting the afterimage of the curved surface display screen according to any one of claims 1 to 6, wherein a ratio of a length of the first sub-region to a length of a pixel unit of the curved surface display screen along a bending direction of the center line is greater than or equal to a ratio of a resolution of the curved surface display screen to a resolution of an image capturing device;
and along the bending direction of the central line, the ratio of the length of the second sub-area to the length of the pixel unit of the curved surface display screen is greater than or equal to the ratio of the resolution of the curved surface display screen to the resolution of the image acquisition device.
9. The utility model provides a residual image detection device of curved surface display screen which characterized in that includes:
the partition module is used for selecting a first area and a second area, the first area and the second area are symmetrically distributed relative to the center line of the curved surface display screen, and the bending direction of the center line is parallel to the bending direction of the curved surface display screen; the first area is divided into a plurality of first sub-areas along the bending direction of the central line, and the second area is divided into a plurality of second sub-areas;
the control module is used for controlling the curved surface display screen to display a preset gray scale picture, controlling the curved surface display screen to be switched from the preset gray scale picture to a residual image detection picture and switching the residual image detection picture back to the preset gray scale picture;
the brightness acquisition module is used for acquiring initial brightness values and actual brightness values of all the first sub-regions and acquiring initial brightness values and actual brightness values of all the second sub-regions;
the processing module is used for obtaining the residual image parameters of the curved surface display screen according to the initial brightness value and the actual brightness value of each first sub-area and the initial brightness value and the actual brightness value of each second sub-area; and determining the residual image level of the curved surface display screen according to the residual image parameters.
10. The utility model provides a residual image detecting system of curved surface display screen which characterized in that includes:
the curved surface display screen comprises a first area and a second area, wherein the first area and the second area are symmetrically distributed relative to the center line of the curved surface display screen, and the bending direction of the center line is parallel to that of the curved surface display screen; the first area is divided into a plurality of first sub-areas along the bending direction of the central line, and the second area is divided into a plurality of second sub-areas;
the controller is electrically connected with the curved surface display screen and is used for controlling the curved surface display screen to display a preset gray scale picture, controlling the curved surface display screen to be switched from the preset gray scale picture to a residual image detection picture and switching the residual image detection picture back to the preset gray scale picture;
the image acquisition device is used for acquiring initial brightness values and actual brightness values of all the first sub-regions and acquiring initial brightness values and actual brightness values of all the second sub-regions;
the processor is in signal connection with the image acquisition device and is used for obtaining the residual image parameters of the curved surface display screen according to the initial brightness value and the actual brightness value of each first sub-region and the initial brightness value and the actual brightness value of each second sub-region; and determining the residual image level of the curved surface display screen according to the residual image parameters.
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