CN114038362B - Residual image detection method, device and system for curved display screen - Google Patents
Residual image detection method, device and system for curved display screen Download PDFInfo
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Abstract
The application provides an afterimage detection method, device and system of a curved display screen, relates to the technical field of display, and aims to solve the technical problem that the afterimage detection accuracy of the curved display screen is low. The residual image detection method comprises the following steps: selecting a first area and a second area, dividing the first area into a plurality of first subareas along the bending direction of the central line, and dividing the second area into a plurality of second subareas; when a curved surface display screen displays a preset gray-scale picture, acquiring initial brightness values of all first subareas and initial brightness values of all second subareas; when the curved surface display screen is switched from a preset gray-scale picture to an afterimage detection picture and back to the preset gray-scale picture, the actual brightness values of all the first subareas and the actual brightness values of all the second subareas are obtained. By dividing a plurality of subareas, each subarea can be focused clearly, the accuracy of acquired brightness data is improved, and the accuracy of residual image detection is improved.
Description
Technical Field
The application relates to the technical field of display, in particular to an afterimage detection method, device and system of a curved display screen.
Background
With the development of display technology, the requirements of people on the Image quality of the display screen are increasing, and the Image Sticking (Image blocking) affects and restricts the improvement of the Image quality of the display screen. The afterimage refers to an image or contour of a previous still picture that appears when a subsequent still picture is displayed after the previous still picture is displayed for a period of time. For this reason, it is necessary to detect the afterimage of the display screen to determine the afterimage level of the display screen.
When the display screen performs afterimage detection, the display screen is photographed to obtain brightness data of a specific area in the display screen. However, when the display screen is a curved display screen, the accuracy of luminance data acquired when photographing is low, and the accuracy of afterimage detection is low.
Disclosure of Invention
In view of the above 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 afterimage detection of the curved display screen.
In order to achieve the above object, the embodiment of the present application provides the following technical solutions:
a first aspect of an embodiment of the present application provides a method for detecting an afterimage of a curved 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 central line of the curved display screen, and the bending direction of the central line is parallel to the bending direction of the curved 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 the bending direction of the central line;
when the curved surface display screen displays a preset gray-scale picture, acquiring initial brightness values of all the first subareas and initial brightness values of all the second subareas;
when the curved surface display screen is switched from the preset gray-scale picture to an afterimage detection picture and is switched from the afterimage detection picture back to the preset gray-scale picture, acquiring the actual brightness values of all the first subareas and the actual brightness values of all the second subareas;
obtaining an afterimage parameter of the curved display screen according to the initial brightness value and the actual brightness value of each first subarea and the initial brightness value and the actual brightness value of each second subarea;
and determining the residual image level of the curved display screen according to the residual image parameters.
According to the method for detecting the residual image of the curved surface display screen, the first area is divided into the plurality of first subareas along the bending direction of the central line of the curved surface display screen, and the second area is divided into the plurality of second subareas 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 subareas which are approximately planar, and the second area of the curved surface is divided into the plurality of second subareas which are approximately planar, and therefore when the initial brightness value and the actual brightness value of each subarea are acquired, the accuracy of brightness data acquired by each subarea is improved through focusing definition of each subarea, and the accuracy of residual image detection of the curved surface display screen is improved.
In one possible implementation manner, when the curved display screen is switched from a preset gray-scale image to an afterimage detection image, the gray-scale image displayed in the first area, the gray-scale image displayed in the second area, and the gray-scale image displayed in the preset gray-scale image are different from each other.
In one possible implementation manner, the gray level of the picture displayed in the first area is smaller than the gray level of the preset gray level picture, and the gray level of the picture displayed in the second area is larger than the gray level of the preset gray level picture.
In one possible implementation manner, the plurality of first sub-regions and the plurality of second sub-regions are in one-to-one correspondence
In one possible implementation manner, the initial brightness value of each first sub-region and the corresponding second sub-region are obtained simultaneously, and the actual brightness value of each first sub-region and the corresponding second sub-region are obtained simultaneously.
In one possible implementation manner, when the curved display screen is switched from the preset gray-scale image to an afterimage detection image, and the afterimage detection image is switched back to the preset gray-scale image, the step of obtaining the actual brightness values of all the first sub-areas and the actual brightness values of all the second sub-areas includes: the curved surface display screen is switched from the preset gray-scale picture to an afterimage detection picture, and after the afterimage detection picture is switched back to the preset gray-scale picture, the actual brightness values of all the first subareas and the actual brightness values of all the second subareas at a plurality of moments are obtained;
The step of obtaining the residual image parameters of the curved display screen according to the initial brightness value and the actual brightness value of each first subarea and the initial brightness value and the actual brightness value of each second subarea comprises the following steps: and acquiring residual image parameters at a plurality of moments after the curved 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 subarea and the initial brightness value and the actual brightness value of each second subarea until the residual image parameters are smaller than or equal to the preset value.
In one possible implementation manner, the calculation formula of the image sticking parameter is:
wherein IS IS an afterimage parameter, I (t) A For the actual luminance value of the first region, I (t) B For the actual luminance value of the second region, I (0) A For the initial luminance value of the first region, I (0) B An initial luminance value for the second region; the actual brightness value of the first area is obtained according to the actual brightness value of each first subarea, the actual brightness value of the second area is obtained according to the actual brightness value of each second subarea, the initial brightness value of the first area is obtained according to the initial brightness value of each first subarea, and the initial brightness value of the second area is obtained according to the initial brightness value of each second subarea.
Preferably, the initial luminance value of the first region is an arithmetic average value of all initial luminance values of the first sub-region, and the actual luminance value of the first region is an arithmetic average value of all actual luminance values of the first sub-region; the initial brightness value of the second area is the arithmetic average value of the initial brightness values of all the second subareas, and the actual brightness value of the second area is the arithmetic average value of the actual brightness values of all the second subareas.
In one possible implementation manner, a ratio of a length of the first sub-region to a length of a pixel unit of the curved display screen is greater than or equal to a ratio of a resolution of the curved display screen to a resolution of an image acquisition device along a bending direction of the center line; and the ratio of the length of the second subarea 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.
A second aspect of an embodiment of the present application provides an afterimage detection apparatus for a curved 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 the central line of the curved surface display screen, the bending direction of the central line is parallel to the bending direction of the curved surface display screen, the first area is divided into a plurality of first subareas along the bending direction of the central line, and the second area is divided into a plurality of second subareas; 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 an afterimage detection picture and switching from the afterimage detection picture 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 subareas and acquiring initial brightness values and actual brightness values of all the second subareas; the processing module is used for obtaining the residual image parameters of the curved display screen according to the initial brightness value and the actual brightness value of each first subarea and the initial brightness value and the actual brightness value of each second subarea; and determining the residual image level of the curved display screen according to the residual image parameters.
According to the afterimage detection device of the curved surface display screen, the first area is divided into the first subareas along the bending direction of the central line of the curved surface display screen through the partitioning module, the second area is divided into the second subareas along the bending direction of the curved surface display screen, the first area of the curved surface is divided into the first subareas which are approximately planar, and the second area of the curved surface is divided into the second subareas which are approximately planar, so that when the brightness acquisition module acquires the initial brightness value and the actual brightness value of each subarea, the brightness of each subarea can be focused clearly, the accuracy of brightness data acquired by each subarea is improved, and the accuracy of afterimage detection of the curved surface display screen is improved.
A third aspect of an embodiment of the present application provides an afterimage detection system of 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 central line of the curved surface display screen, and the bending direction of the central line is parallel to the bending direction of the curved surface display screen; the first area is divided into a plurality of first subareas along the bending direction of the central line, and the second area is divided into a plurality of second subareas; 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 an afterimage detection picture and switching from the afterimage detection picture 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 subareas and acquiring initial brightness values and actual brightness values of all the second subareas; 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 subarea and the initial brightness value and the actual brightness value of each second subarea; and determining the residual image level of the curved display screen according to the residual image parameters.
According to the afterimage detection system of the curved surface display screen, the image acquisition device is used for carrying out image acquisition and brightness acquisition on the plurality of first subareas divided along the bending direction of the central line of the curved surface display screen, and carrying out image acquisition and brightness acquisition on the plurality of second subareas divided along the bending direction of the curved surface display screen, so that the image acquisition device focuses clearly on each first subarea and each second subarea, the accuracy of brightness data acquired by each first subarea and each second subarea is improved, and the accuracy of afterimage detection of the curved surface display screen is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a top view of a curved display screen in an embodiment of the application;
FIG. 2 is a side view of a curved display screen in an embodiment of the application;
FIG. 3 is a flowchart of an afterimage detection method of a curved display screen according to an embodiment of the present application;
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 diagram of a first sub-region and a second sub-region in an embodiment of the application;
FIG. 6 is a schematic diagram of a curved display screen displaying a preset gray-scale screen according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a curved display screen displaying an afterimage detection screen according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of an afterimage detection system of a curved display screen according to an embodiment of the present application.
Reference numerals illustrate:
10-a curved display screen; 20-an afterimage detection system;
21-a controller; 22-an image acquisition device;
23-processor.
Detailed Description
As described in the background art, the problem of low detection accuracy of the afterimage exists in the curved display screen in the related art, and the inventor researches that the reason is that the curved display screen has radian, when the image of the specific area in the curved display screen is acquired by the image acquisition device, the image acquisition device focuses on a part of the specific area clearly, and focuses on the other part of the specific area and blurs, so that the accuracy of brightness data acquired according to the image is low, and the accuracy of afterimage detection is low.
In view of the above technical problems, in the method for detecting an afterimage of a curved display screen provided by the embodiment of the application, a first area is divided into a plurality of first sub-areas along a bending direction of a central line of the curved display screen, and a second area is divided into a plurality of second sub-areas along the bending direction of the central line of the curved display screen, so that the first area of the curved display screen is divided into a plurality of first sub-areas which are approximately planar, and the second area of the curved display screen is divided into a plurality of second sub-areas which are approximately planar, so that when an initial brightness value and an actual brightness value of each sub-area are acquired, each sub-area can be focused clearly, and the accuracy of brightness data acquired by each sub-area is improved, thereby improving the accuracy of afterimage detection of the curved display screen.
In order to make the above objects, features and advantages of the embodiments of the present application more comprehensible, the technical solutions of the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The embodiment of the application provides a method for detecting residual images of a curved display screen, wherein the curved 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 a picture, that is, the front surface of the curved display screen 10 is a light emitting side, and the curved display screen is recessed toward the back surface. As shown in fig. 2, the surface on the right side of the curved display 10 is a front surface, the curved display 10 is recessed to the left side, and the bending direction of the curved display 10 may refer to the bending direction of the front surface of the curved display 10, which is shown by an arrow in fig. 2.
Referring to fig. 3, the method for detecting an afterimage of a curved display screen according to an 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 central line of the curved display screen, and the bending direction of the central line is parallel to the bending direction of the curved 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 by the dashed line at I-I in fig. 1 and 2. As shown in fig. 2, the center line of the curved display screen 10 is an arc, the bending direction of the center line is parallel to the bending direction of the curved display screen 10, and the radian of the center line is the same as the radian of the bending direction of the curved display screen 10.
Referring to fig. 4, a first area and a second area are selected on the curved display screen 10, where 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 region and the second region are partial regions on the curved display screen, and the first region and the second region are symmetrical with respect to the center line of the curved display screen 10, that is, the first region and the second region are axisymmetrical. As shown in fig. 4, the first region and the second region are located on both sides of the center line, respectively, and illustratively, the first region is located on the left side of the center line and the second region is located on the right side of the center line, i.e., the first region is shown in fig. 4 a and the second region is shown in fig. 4B.
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 a plane shown in fig. 4 are polygonal, such as rectangular. The first area and the second area can be selected to 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, 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 region is equal to the width V2 of the second region, for example equal to 10% of the width V of the curved display screen 10. The distance L between the first region and the second region may be 1mm.
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. In the orientation shown in fig. 5, the first sub-regions are A1, A2, … …, ai in order from bottom to top, and the second sub-regions are B1, B2, … …, bi in order from bottom to top. It should be noted that the number of first sub-areas may be different from the number of second areas.
The length of the first sub-region and the length of the second sub-region are related to the pixel resolution of the image acquisition device and the pixel resolution of the curved display screen 10 along the bending direction of the curved display screen 10. The image acquisition device can comprise a shooting device and an image processing device, wherein the shooting device is used for shooting a curved display screen, and the image processing device acquires brightness data according to the acquired pictures. The camera may be a surface scanning camera, for example an LMK surface scanning camera.
In some possible examples, the ratio of the length D1 of the first sub-region to the length of the pixel unit of the curved display screen 10 along the curved direction of the curved display screen 10 (i.e., the curved direction of the center line) is greater than or equal to the ratio of the resolution of the curved display screen 10 to the resolution of the image capturing 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 center line) is greater than or equal to the ratio of the resolution of the curved display screen 10 to the resolution of the image capturing 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 subarea and the second subarea acquired by the image acquisition device can be ensured, so that the accuracy of brightness data is improved.
Step S103: when the curved surface display screen displays a preset gray-scale picture, initial brightness values of all the first subareas and initial brightness values of all the second subareas are obtained.
Referring to fig. 6, the curved display 10 may display a gray scale of 255, wherein the highest gray scale of the curved display 10 is 255 and the lowest gray scale is 0. The gray level of the preset gray level frame may be any gray level located between the highest gray level and the lowest gray level, for example, the gray level of the preset gray level frame may be 48, or the gray level of the preset 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 the 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 display screen 10 is placed on the carrier, an image acquisition device is arranged on one side, away from the carrier, of the curved display screen 10, and the first area and the second area are located below the image acquisition device. By adjusting the distance between the curved display screen 10 and the image acquisition device, the position of the curved display screen 10 on the carrier, and the pixel resolution (PPI) of the image acquisition device, the image acquisition device focuses on the sub-area to be acquired clearly. It will be appreciated that each sub-region has a smaller curvature along the curved direction of the curved display screen 10, and each sub-region may be considered approximately planar. When each sub-area 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 sub-area is improved.
Referring to fig. 4 to 6, the initial luminance value of each first sub-region 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 value of each second sub-region may be sequentially obtained from B1 to Bi when the initial luminance values of all the second sub-regions are obtained.
In one 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-areas and the plurality of second sub-areas are in one-to-one correspondence. As shown in fig. 4 and 5, each first sub-region is identical to 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 subareas and the initial brightness values of all the second subareas are acquired, the initial brightness values of each first subarea and the corresponding second subareas can be acquired simultaneously, and when the actual brightness values of all the first subareas and the actual brightness values of all the second subareas are acquired subsequently, the actual brightness values of each first subarea and the corresponding second subareas are acquired 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 simultaneously acquired 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 image, the preset gray-scale image will be maintained for a period of time, and at least the initial brightness values of all the first sub-areas and the initial brightness values of all the second sub-areas need to be obtained, and then the next step is performed. The shorter and better the time for keeping the preset gray-scale picture is, so as to improve the accuracy of the residual image detection.
Step S104: when the curved surface display screen is switched from a preset gray-scale picture to an afterimage detection picture and the afterimage detection picture is switched back to the preset gray-scale picture, the actual brightness values of all the first subareas and the actual brightness values of all the second subareas are obtained.
Referring to fig. 7, the curved display screen 10 is switched from a preset gray-scale screen to an afterimage detection screen, and the afterimage detection screen 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 held for several seconds, for example, 10s. When the curved display 10 is subjected to the middle-stage afterimage detection, the afterimage detection screen is held for several minutes, for example, 10 minutes.
When the curved display screen 10 displays the residual image detection picture, the gray scale of the picture displayed in the first area, the gray scale of the picture 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 picture displayed in the first area is smaller than the gray scale of the preset gray scale picture, and the gray scale of the picture displayed in the second area is larger than the gray scale of the preset gray scale picture.
In some possible examples, when the curved display 10 displays the afterimage detection screen, the curved display 10 located on one side of the center line displays a first solid color screen, and the curved display 10 located on the other side of the center line displays a second solid color screen. The gray scale of the first pure color picture is 0, and the gray scale of the second pure color picture is 255, namely the residual image detection picture is a half-black half-white picture. The gray level difference between the gray level of the picture displayed in the first area and the gray level of the picture displayed in the second area is the largest, so that the contrast ratio of the afterimage of the two areas is improved when the preset gray level picture is displayed later, and the afterimage detection is facilitated.
The curved display screen 10 is switched back to the preset gray-scale image from the residual image detection image. It can be understood that the preset gray-scale frame refers to a parameter frame input to the curved display screen 10, i.e. an ideal frame, and when the curved display screen 10 is switched back to the preset gray-scale frame, the actual image displayed by the curved display screen 10 is not a simple preset gray-scale frame, and there is an afterimage of the afterimage detection frame. 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, where the process of obtaining the actual luminance values of the first sub-regions and the actual luminance values of the second sub-regions may refer to the process of obtaining the initial luminance values of the first sub-regions and the initial luminance values of the second sub-regions, which are not described herein.
Step S105: and obtaining the residual image parameters of the curved display screen according to the initial brightness value and the actual brightness value of each first subarea and the initial brightness value and the actual brightness value of each second subarea.
The image sticking parameter of the curved display screen 10 can be obtained 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 residual image parameter of the curved display screen 10 may be the minimum perceived difference (Just Noticeable Difference, abbreviated as JND), and specifically, the residual image parameter of the curved display screen 10 may be calculated by the following formula:
wherein IS IS an afterimage parameter, I (t) A For the actual luminance value of the first region, I (t) B For the actual luminance value of the second region, I (0) A For the initial luminance value of the first region, I (0) B Is the initial luminance value of the second region.
Wherein the actual luminance value of the first region is obtained from the actual luminance value of each first sub-region, the actual luminance value of the second region is obtained from the actual luminance value of each second sub-region, the initial luminance value of the first region is obtained from the initial luminance value of each first sub-region, and the initial luminance value of the second region is obtained from the initial luminance value of each second sub-region.
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 the arithmetic average of the initial luminance values of all the second sub-regions, and the actual luminance value of the second region is the 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 area, and the initial luminance value and the actual luminance value of the second area may also be other parameters, such as the median.
In one possible embodiment of the present application, when the curved display screen is switched from the preset gray-scale image to the residual image detection image and from the residual image detection image back to the preset gray-scale image, the step of obtaining the actual brightness values of all the first sub-areas and the actual brightness values of all the second sub-areas includes: the curved surface display screen is switched from a preset gray-scale picture to an afterimage detection picture, and after the afterimage detection picture is switched back to the preset gray-scale picture, the actual brightness values of all the first subareas and the actual brightness values of all the second subareas at a plurality of moments are continuously obtained.
Correspondingly, the step of obtaining the residual image parameters of the curved display screen according to the initial brightness value and the actual brightness value of each first subarea and the initial brightness value and the actual brightness value of each second subarea comprises the following steps: and continuously acquiring the residual image parameters at a plurality of moments after the curved 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 subarea and the initial brightness value and the actual brightness value of each second subarea until the residual image parameters are smaller than or equal to the preset value.
That is, after the curved display screen 10 is switched back to the preset gray-scale image, the actual brightness values at n times are continuously obtained to calculate the residual image parameters at the n times. The interval between these n times is the time required for the curved display screen 10 to acquire the first region and the second region. And gradually reducing the afterimage parameters along with the gradual increase of n moments, and stopping acquisition when the afterimage parameters are reduced to be lower than a preset value, wherein the afterimage parameters are nth afterimage parameters.
For example, the preset value may be 1.6x0.004, when the time required for collecting each first sub-area and each second sub-area once after the curved display screen 10 switches back to the preset gray-scale image is t, the difference between n times is t, so as to continuously obtain the actual brightness values of the first area and the second area, and calculate the afterimage parameters. When the image retention parameter is reduced to 1.6x0.004, the collection is stopped, the image retention parameter is the nth image retention parameter, and the smaller the nth time corresponding to the image retention parameter is, the faster the image retention elimination rate of the curved display screen 10 is.
Step S106: and determining the residual image level of the curved display screen according to the residual image parameters.
The image retention level of the curved display screen 10 can be determined according to the image retention parameter and the time corresponding to the image retention parameter. The smaller the image retention parameter is, or the smaller the time corresponding to the image retention parameter being reduced to a preset value is, the lower the image retention level is.
According to the afterimage detection method of the curved surface display screen 10, the first area is divided into the plurality of first subareas along the bending direction of the curved surface display screen 10, and the second area is divided into the plurality of second subareas along the bending direction of the central line of the curved surface display screen 10, so that the first area of the curved surface is divided into the plurality of first subareas which are approximately planar, and the second area of the curved surface is divided into the plurality of second subareas which are approximately planar, and therefore when the initial brightness value and the actual brightness value of each subarea are acquired, the focus of each subarea is clear, the accuracy of brightness data acquired by each subarea is improved, and the accuracy of afterimage detection of the curved surface display screen 10 is improved.
The embodiment of the application provides an afterimage detection device of a curved display screen, which comprises a partition module, a control module, a brightness acquisition module and a processing module.
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 central line of the curved display screen 10, and the bending direction of the central line is equal to the bending direction of the curved display screen 10; 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.
The control module is used for controlling the curved display screen 10 to display a preset gray-scale image, and controlling the curved display screen 10 to switch from the preset gray-scale image to the residual image detection image and switch from the residual image detection image to the preset gray-scale image.
The brightness acquisition module is used for acquiring initial brightness values and actual brightness values of all the first subareas and acquiring initial brightness values and actual brightness values of all the second subareas.
The processing module is used for obtaining the residual image parameters of the curved display screen 10 according to the initial brightness value and the actual brightness value of each first subarea and the initial brightness value and the actual brightness value of each second subarea; and determining the residual image level of the curved display screen 10 according to the residual image parameters.
According to the residual image detection device of the curved surface display screen 10 provided by the embodiment of the application, the first area is divided into the plurality of first subareas along the bending direction of the curved surface display screen 10 by the partition module, and the second area is divided into the plurality of second subareas along the bending direction of the central line of the curved surface display screen 10, so that the first area of the curved surface is divided into the plurality of first subareas which are approximate to the plane, and the second area of the curved surface is divided into the plurality of second subareas which are approximate to the plane, so that when the brightness acquisition module acquires the initial brightness value and the actual brightness value of each subarea, the focus of each subarea is clear, the accuracy of the brightness data acquired by each subarea is improved, and the accuracy of residual image detection of the curved surface display screen 10 is improved.
The embodiment of the application also provides an afterimage detection system of the curved display screen, referring to fig. 8, the afterimage detection system comprises: the curved display screen 10, the controller 21, the image acquisition device 22 and the processor 23.
The curved display screen 10 includes a first area and a second area, wherein the first area and the second area are symmetrically distributed relative to a central line of the curved display screen 10, and a bending direction of the central line is parallel to a bending direction of the curved display screen 10; 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.
The controller 21 is electrically connected to the curved display screen 10, and is configured to control the curved display screen 10 to display a preset gray-scale image, and control the curved display screen 10 to switch from the preset gray-scale image to the residual image detection image, and switch from the residual image detection image to the preset gray-scale image.
When the curved display screen 10 displays the residual image detection picture, the gray scale of the picture displayed in the first area, the gray scale of the picture 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 picture displayed in the first area is smaller than the gray scale of the preset gray scale picture, and the gray scale of the picture displayed in the second area is larger than the gray scale of the preset gray scale picture.
In some possible examples, when the curved display 10 displays the afterimage detection screen, the curved display 10 located on one side of the center line displays a first solid color screen, and the curved display 10 located on the other side of the center line displays a second solid color screen. When the gray level of the first pure color picture is 0, the first pure color picture is in a full black state, and when the gray level 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 half-black half-white picture. The gray level difference between the gray level of the picture displayed in the first area and the gray level of the picture displayed in the second area is the largest, so that the contrast ratio of the afterimage of the two areas is improved when the preset gray level picture is displayed later, and the afterimage detection is facilitated.
The curved display screen 10 is switched back to the preset gray-scale image from the residual image detection image. It can be understood that the preset gray-scale frame refers to a parameter frame input to the curved display screen 10, i.e. an ideal frame, and when the curved display screen 10 is switched back to the preset gray-scale frame, the actual image displayed by the curved display screen 10 is not a simple preset gray-scale frame, and there is an afterimage of the afterimage detection frame.
The image acquisition device 22 is located at the light emitting side of the curved display screen 10, and is configured to acquire initial brightness values and actual brightness values of all the first sub-regions, acquire initial brightness values and actual brightness values of all the second sub-regions, and transmit brightness data (initial brightness values and actual brightness values) to the processor. For example, the image capturing device 22 may include a photographing device for photographing a curved pixel screen and an image processing device for acquiring luminance data according to the captured photograph. The camera may be a face scanning camera.
The processor 23 is in signal connection with the image acquisition device 22, the processor 23 receives the brightness data transmitted by the image acquisition device 22, obtains initial brightness values and actual brightness values of all the first subareas and initial brightness values and actual brightness values of all the second subareas according to the image, and obtains the afterimage parameters of the curved display screen 10 according to the initial brightness values and actual brightness values of each first subarea and the initial brightness values and actual brightness values of each second subarea. The processor 23 may also determine the residual image level of the curved display screen 10 based on the residual image parameters.
In the afterimage detection system 20 of the curved display screen in the embodiment of the application, the image acquisition device 22 is used for acquiring images of the plurality of first subareas divided along the bending direction of the central line of the curved display screen 10 and acquiring images of the plurality of second subareas divided along the bending direction of the curved display screen 10, so that the image acquisition device 22 focuses each first subarea and each second subarea clearly, thereby improving the accuracy of brightness data acquired by each first subarea and each second subarea, and further improving the accuracy of afterimage detection of the curved display screen.
In this specification, each embodiment or implementation is described in a progressive manner, and each embodiment focuses on a difference from other embodiments, and identical and similar parts between the embodiments are all enough to refer 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. Furthermore, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that 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.
Generally, terms should be understood at least in part by use in the context. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, at least in part depending on the context. Similarly, terms such as "a" or "an" may also be understood to convey a singular usage or a plural usage, depending at least in part on the context.
It should be readily understood that the terms "on … …", "above … …" and "above … …" in this disclosure should be interpreted in the broadest sense such that "on … …" means not only "directly on something", but also includes "on something" with intermediate features or layers therebetween, and "above … …" or "above … …" includes not only the meaning "on something" or "above" but also the meaning "above something" or "above" without intermediate features or layers therebetween (i.e., directly on something).
Further, spatially relative terms, such as "below," "beneath," "above," "over," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated. 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.
The term "substrate" as used herein refers to a material upon which subsequent layers of material are 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 regions having a certain thickness. The layer may extend over the entire underlying or overlying structure, or may have a range that is less than the range of the underlying or overlying structure. Further, the layer may be a region of a continuous structure, either homogenous or non-homogenous, having a thickness less than the thickness of the continuous structure. For example, the 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, and/or thereunder. 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 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 or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (10)
1. The residual image detection method of the curved surface display screen is characterized by comprising the following steps of:
selecting a first area and a second area, wherein the first area and the second area are symmetrically distributed relative to the central line of the curved display screen, and the bending direction of the central line is parallel to the bending direction of the curved display screen;
dividing the first area into a plurality of first subareas along the bending direction of the central line, dividing the second area into a plurality of second subareas, wherein the ratio of the length of the first subareas to the length of the pixel units 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; the ratio of the length of the second sub-region to the length of the pixel unit of the curved surface display screen is larger than or equal to the ratio of the resolution of the curved surface display screen to the resolution of the image acquisition device;
When the curved surface display screen displays a preset gray-scale picture, acquiring initial brightness values of all the first subareas and initial brightness values of all the second subareas;
when the curved surface display screen is switched from the preset gray-scale picture to an afterimage detection picture and is switched from the afterimage detection picture back to the preset gray-scale picture, acquiring the actual brightness values of all the first subareas and the actual brightness values of all the second subareas;
obtaining an afterimage parameter of the curved display screen according to the initial brightness value and the actual brightness value of each first subarea and the initial brightness value and the actual brightness value of each second subarea;
and determining the residual image level of the curved display screen according to the residual image parameters.
2. The method for detecting residual image of curved display screen according to claim 1, wherein when the curved display screen is switched from a preset gray-scale image to a residual image detection image, the gray-scale of the image displayed in the first area, the gray-scale of the image displayed in the second area, and the gray-scale of the preset gray-scale image are different from each other.
3. The method for detecting residual image of curved display screen according to claim 2, wherein the gray scale of the picture displayed in the first area is smaller than the gray scale of the preset gray scale picture, and the gray scale of the picture displayed in the second area is larger than the gray scale of the preset gray scale picture.
4. The method for detecting an afterimage of a curved display screen according to claim 1, wherein a plurality of the first sub-regions are in one-to-one correspondence with a plurality of the second sub-regions.
5. The method for detecting an afterimage of a curved display screen according to claim 4, wherein initial luminance values of each of the first sub-regions and the corresponding second sub-regions are simultaneously acquired, and actual luminance values of each of the first sub-regions and the corresponding second sub-regions are simultaneously acquired.
6. The method for detecting an afterimage of a curved display screen according to claim 4, wherein the step of acquiring actual luminance values of all the first sub-areas and actual luminance values of all the second sub-areas when the curved display screen is switched from the preset gray-scale screen to an afterimage detection screen and from the afterimage detection screen back to the preset gray-scale screen includes:
the curved surface display screen is switched from the preset gray-scale picture to an afterimage detection picture, and after the afterimage detection picture is switched back to the preset gray-scale picture, the actual brightness values of all the first subareas and the actual brightness values of all the second subareas at a plurality of moments are obtained;
The step of obtaining the residual image parameters of the curved display screen according to the initial brightness value and the actual brightness value of each first subarea and the initial brightness value and the actual brightness value of each second subarea comprises the following steps:
and acquiring residual image parameters at a plurality of moments after the curved 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 subarea and the initial brightness value and the actual brightness value of each second subarea until the residual image parameters are smaller than or equal to the preset value.
7. The method for detecting an afterimage of a curved display screen according to any one of claims 1 to 6, wherein a calculation formula of the afterimage parameters is:
；
wherein IS IS an afterimage parameter, I (t) A For the actual luminance value of the first region, I (t) B For the actual luminance value of the second region, I (0) A For the initial luminance value of the first region, I (0) B An initial luminance value for the second region;
the actual brightness value of the first area is obtained according to the actual brightness value of each first subarea, the actual brightness value of the second area is obtained according to the actual brightness value of each second subarea, the initial brightness value of the first area is obtained according to the initial brightness value of each first subarea, and the initial brightness value of the second area is obtained according to the initial brightness value of each second subarea.
8. The method for detecting an afterimage of a curved display screen according to claim 7, wherein an initial luminance value of the first region is an arithmetic average value of initial luminance values of all the first sub-regions, and an actual luminance value of the first region is an arithmetic average value of actual luminance values of all the first sub-regions;
the initial brightness value of the second area is the arithmetic average value of the initial brightness values of all the second subareas, and the actual brightness value of the second area is the arithmetic average value of the actual brightness values of all the second subareas.
9. An afterimage detection device of a curved display screen, comprising:
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 the central line of the curved display screen, and the bending direction of the central line is parallel to the bending direction of the curved display screen; the first area is divided into a plurality of first subareas along the bending direction of the central line, the second area is divided into a plurality of second subareas, and the ratio of the length of the first subareas to the length of the pixel units of the curved surface display screen is larger than or equal to the ratio of the resolution of the curved surface display screen to the resolution of the image acquisition device; the ratio of the length of the second sub-region to the length of the pixel unit of the curved surface display screen is larger than or equal to the ratio of the resolution of the curved surface display screen to the resolution of the image acquisition device;
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 an afterimage detection picture and switching from the afterimage detection picture 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 subareas and acquiring initial brightness values and actual brightness values of all the second subareas;
the processing module is used for obtaining the residual image parameters of the curved display screen according to the initial brightness value and the actual brightness value of each first subarea and the initial brightness value and the actual brightness value of each second subarea; and determining the residual image level of the curved display screen according to the residual image parameters.
10. An afterimage detection system of a curved display screen, comprising:
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 central line of the curved surface display screen, and the bending direction of the central line is parallel to the bending direction of the curved surface display screen; the first area is divided into a plurality of first subareas along the bending direction of the central line, the second area is divided into a plurality of second subareas, and the ratio of the length of the first subareas to the length of the pixel units of the curved surface display screen is larger than or equal to the ratio of the resolution of the curved surface display screen to the resolution of the image acquisition device; the ratio of the length of the second sub-region to the length of the pixel unit of the curved surface display screen is larger than or equal to the ratio of the resolution of the curved surface display screen to the resolution of the image acquisition device;
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 an afterimage detection picture and switching from the afterimage detection picture 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 subareas and acquiring initial brightness values and actual brightness values of all the second subareas;
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 subarea and the initial brightness value and the actual brightness value of each second subarea; and determining the residual image level of the curved display screen according to the residual image parameters.
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