CN109345986B - A method and device for judging residual image of a display panel - Google Patents

Abstract

The invention provides a method and a device for determining afterimages of a display panel, which relate to the technical field of display. The present invention switches the display panel from the first grayscale picture to the preset picture by acquiring the first average brightness value of the pixels in each pixel group when the display panel displays the first grayscale picture, and then again from the preset picture After switching to the first grayscale picture, the second average brightness value of the pixels in each pixel group is acquired, and the afterimage state of the display panel is determined according to the first average brightness value and the second average brightness value. Through the first average brightness value of the pixels in each pixel group when the first grayscale picture is displayed, and the second average brightness value of the pixels in each pixel group after switching from the preset picture to the first grayscale picture , automatically calculates the afterimage state of the display panel to ensure that the calculated afterimage type and/or afterimage level will not be different due to people's subjective consciousness, improving the accuracy of the judgment result and the judgment efficiency.

Description

A method and device for determining afterimage of a display panel

technical field

The present invention relates to the field of display technology, and in particular, to a method and device for determining afterimage of a display panel.

Background technique

With the continuous development of display technology, people's requirements for display panels are getting higher and higher, and display panels are gradually developing in the direction of large size and high resolution. Smaller, the characteristics of TFT (Thin Film Transistor, Thin Film Transistor) are not easy to control, and the voltage applied to both ends of the liquid crystal is difficult to achieve symmetry. The performance deteriorates, resulting in aggravation of afterimages, and at the same time, insufficient charging time will also cause afterimages. Afterimage means that when the display panel keeps a still picture for a long time, when other pictures are displayed, traces of the previous still picture can still be seen on the display panel.

At present, the afterimage type and afterimage level of the display panel are mainly judged by human eyes. However, the human eye judgment method is highly subjective, the accuracy of the judgment result is low, and the judgment efficiency is low.

SUMMARY OF THE INVENTION

The present invention provides a method and device for determining an afterimage of a display panel, so as to solve the problems of low accuracy and low efficiency of the existing afterimage determining method.

In order to solve the above problems, the present invention discloses a method for determining afterimage of a display panel, including:

acquiring a first average luminance value of pixels in each pixel group when the display panel displays a first grayscale picture; the display panel includes a plurality of pixel groups;

Switching the display panel from the first grayscale image to a preset image and maintaining a first preset duration, and switching from the preset image to the first grayscale image again and maintaining a second preset duration After that, obtain the second average brightness value of the pixels in each pixel group;

An afterimage state of the display panel is determined according to the first average brightness value and the second average brightness value; the afterimage state includes an afterimage type and/or an afterimage level.

Preferably, the preset picture includes a first sub-picture located in a first pixel area and a second sub-picture located in a second pixel area, and the grayscale value of the first subpicture is greater than the preset grayscale value , the grayscale value of the second sub-picture is smaller than the preset grayscale value; the step of determining the afterimage state of the display panel according to the first average brightness value and the second average brightness value, include:

When the difference between the average value of the second average luminance value of the pixel group in the first pixel area and the average value of the first average luminance value is greater than the first set threshold, determine the afterimage type of the display panel white afterimage;

When the difference between the average value of the first average luminance value of the pixel group in the second pixel area and the average value of the second average luminance value is greater than the second set threshold, determining the afterimage type of the display panel For the black afterimage.

Preferably, the step of determining the afterimage state of the display panel according to the first average brightness value and the second average brightness value includes:

Calculate the average value of the square of the difference between the first average brightness value and the second average brightness value of each pixel group to obtain the residual image coefficient;

The afterimage level of the display panel is determined according to the corresponding relationship between the afterimage coefficient and the preset afterimage level.

Preferably, before the step of determining the afterimage state of the display panel according to the first average brightness value and the second average brightness value, the method further includes:

acquiring the first luminance variance value of the pixels in each pixel group when the display panel displays the second grayscale picture;

acquiring the second luminance variance value of the pixels in each pixel group when the display panel displays the third grayscale picture;

When the display panel displays the preset picture, the third luminance variance value of the pixels in each pixel group is acquired; the preset picture includes a first sub-picture and a second sub-picture, and the first sub-picture The grayscale value of a sub-picture is the same as the grayscale value of the second grayscale picture, and the grayscale value of the second subpicture is the same as the grayscale value of the third grayscale picture;

According to the third brightness variance value of the pixel group in the first sub-picture and the first brightness variance value, and/or the third brightness variance value of the pixel group in the second sub-picture and the The second brightness variance value is used to determine the abnormal pixel group;

The first average luminance value and the second average luminance value of the abnormal pixel group are removed.

Preferably, according to the third luminance variance value of the pixel group in the first sub-picture and the first luminance variance value, and/or the third luminance of the pixel group in the second sub-picture The variance value and the second luminance variance value, the step of determining the abnormal pixel group includes:

When the absolute value of the difference between the third luminance variance value of the pixel group in the first sub-picture and the first luminance variance value is greater than a third set threshold, determine the first sub-picture The pixel group inside is an abnormal pixel group;

When the absolute value of the difference between the third luminance variance value of the pixel group in the second sub-picture and the second luminance variance value is greater than the fourth set threshold, determine the second sub-picture The pixel group inside is an abnormal pixel group.

In order to solve the above problems, the present invention also discloses a device for determining afterimage of a display panel, comprising:

a first average luminance value acquisition module, configured to acquire a first average luminance value of pixels in each pixel group when the display panel displays a first grayscale image; the display panel includes a plurality of pixel groups;

The second average brightness value acquisition module is configured to switch the display panel from the first grayscale image to a preset image for a first preset duration, and switch from the preset image to the first image again After a grayscale image is maintained for a second preset duration, the second average luminance value of the pixels in each pixel group is obtained;

The afterimage state determination module is configured to determine the afterimage state of the display panel according to the first average brightness value and the second average brightness value; the afterimage state includes the afterimage type and/or the afterimage level.

Preferably, the preset picture includes a first sub-picture located in a first pixel area and a second sub-picture located in a second pixel area, and the grayscale value of the first subpicture is greater than the preset grayscale value , the grayscale value of the second sub-picture is smaller than the preset grayscale value; the afterimage state determination module includes:

The first submodule for determining the afterimage type is configured to, when the difference between the average value of the second average luminance value of the pixel group in the first pixel area and the average value of the first average luminance value is greater than the first setting When the threshold is determined, the afterimage type of the display panel is determined to be a white afterimage;

a second determination sub-module of the afterimage type, configured to when the difference between the average value of the first average brightness value of the pixel group in the second pixel area and the average value of the second average brightness value is greater than the second setting When the threshold value is set, it is determined that the afterimage type of the display panel is a black afterimage.

Preferably, the afterimage state determination module includes:

an afterimage coefficient calculation submodule, configured to calculate the average value of the square of the difference between the first average brightness value and the second average brightness value of each pixel group to obtain the afterimage coefficient;

The afterimage level determination submodule is configured to determine the afterimage level of the display panel according to the corresponding relationship between the afterimage coefficient and the preset afterimage level.

Preferably, it also includes:

a first brightness variance value acquisition module, configured to acquire the first brightness variance value of the pixels in each pixel group when the display panel displays the second grayscale picture;

A second luminance variance value acquisition module, configured to acquire a second luminance variance value of pixels in each pixel group when the display panel displays a third grayscale image;

A third luminance variance value obtaining module is configured to obtain a third luminance variance value of the pixels in each pixel group when the display panel displays the preset picture; the preset picture includes a third luminance variance value. A sub-picture and a second sub-picture, the gray-scale value of the first sub-picture is the same as the gray-scale value of the second gray-scale picture, and the gray-scale value of the second sub-picture is the same as the third gray-scale value The grayscale value of the screen is the same;

An abnormal pixel group determination module, configured to determine according to the third luminance variance value of the pixel group in the first sub-picture and the first luminance variance value, and/or the pixel group in the second sub-picture The third brightness variance value and the second brightness variance value of , determine the abnormal pixel group;

The luminance value removing module is configured to remove the first average luminance value and the second average luminance value of the abnormal pixel group.

Preferably, the abnormal pixel group determination module includes:

The first submodule for determining abnormal pixel groups is configured to, when the absolute value of the difference between the third luminance variance value of the pixel group in the first sub-picture and the first luminance variance value is greater than the third When setting the threshold, determine that the pixel group in the first sub-picture is an abnormal pixel group;

The second sub-module for determining abnormal pixel groups is configured to, when the absolute value of the difference between the third luminance variance value of the pixel group in the second sub-picture and the second luminance variance value is greater than the fourth When the threshold is set, the pixel group in the second sub-picture is determined to be an abnormal pixel group.

Compared with the prior art, the present invention includes the following advantages:

By acquiring the first average brightness value of the pixels in each pixel group when the display panel displays the first grayscale picture, the display panel is switched from the first grayscale picture to the preset picture and maintained for the first preset duration, and After switching from the preset image to the first gray-scale image again and maintaining the second preset duration, obtain the second average brightness value of the pixels in each pixel group, and determine the second average brightness value according to the first average brightness value and the second average brightness value. Displays the afterimage status of the panel, including afterimage type and/or afterimage level. By displaying the first average brightness value of the pixels in each pixel group when the first grayscale picture is displayed, and switching from the first grayscale picture to the preset picture, and then switching from the preset picture to the first grayscale picture again The second average brightness value of the pixels in each pixel group, automatically calculates the afterimage state of the display panel, ensures that the calculated afterimage type and/or afterimage level will not be different due to people’s subjective consciousness, and improves the accuracy of the judgment result. Accuracy and Judgment Efficiency.

Description of drawings

FIG. 1 shows a flowchart of a method for determining an afterimage of a display panel according to an embodiment of the present invention;

FIG. 2 shows a schematic diagram of a preset screen according to an embodiment of the present invention;

FIG. 3 shows a flowchart of another method for determining afterimage of a display panel according to an embodiment of the present invention;

4 shows a structural block diagram of a device for determining afterimage of a display panel according to an embodiment of the present invention;

FIG. 5 shows a structural block diagram of another apparatus for determining an afterimage of a display panel according to an embodiment of the present invention.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Example 1

Referring to FIG. 1 , a flowchart of a method for determining an afterimage of a display panel according to an embodiment of the present invention is shown, which may specifically include the following steps:

Step 101: Obtain a first average luminance value of pixels in each pixel group when the display panel displays a first grayscale picture; the display panel includes a plurality of pixel groups.

In this embodiment of the present invention, the display panel is lit with a first grayscale image, and after the brightness of the first grayscale image is stabilized, a camera device, such as a camera, is used to capture the image of each pixel in the first grayscale image. Brightness data; divide the display panel into a plurality of pixel groups, calculate the average value of the brightness data of the pixels in each pixel group, and then obtain the average value of the pixels in each pixel group when the display panel displays the first grayscale picture. The first average luminance value.

Therefore, the first average luminance value of the pixels in the ith pixel group is:

表示第i个像素组内的像素的第一平均亮度值，x_Aij表示第i个像素组内的第j个像素在显示第一灰阶画面时的亮度数据，N表示第i个像素组内的像素数量。in,

Indicates the first average brightness value of the pixels in the ith pixel group, x _Aij represents the brightness data of the jth pixel in the ith pixel group when displaying the first grayscale picture, and N represents the pixel in the ith pixel group. number of pixels.

It should be noted that the grayscale value of the first grayscale picture can be Gray127; the brightness data of pixels within a certain period of time can be collected by a camera device, and when the brightness data no longer jumps, it is determined that the brightness of the first grayscale picture is stable , or a preset duration is set, and when the duration of the first grayscale image reaches the preset time, it can be determined that the brightness of the first grayscale image is stable.

The display panel is divided into multiple pixel groups in advance, and the number of pixels in each pixel group can be 8×8, 4×4 or 16×16, etc. The number of pixel groups depends on the resolution of the display panel and the number of pixels in each pixel group. The number of pixels is determined. For example, when the resolution of the display panel is 1920×1680, and the number of pixels in each pixel group is 8×8, the number of pixel groups is 50400. In addition, the number of pixels in each pixel group may be the same or different, and the present invention takes the same number of pixels in each pixel group as a preferred solution.

When the number of pixels in each pixel group is 8×8, N in formula (1) is equal to 64, and formula (1) is to calculate the average value of luminance data of 64 pixels in the i-th pixel group.

Step 102: Switch the display panel from the first grayscale image to a preset image and maintain a first preset duration, and switch from the preset image to the first grayscale image again and maintain a second grayscale image After the preset time period, the second average brightness value of the pixels in each pixel group is acquired.

In the embodiment of the present invention, when judging the afterimage state of the display panel, the display panel may be switched from the first grayscale image to the preset image first, and after the preset image is lit for the first preset duration, the display panel may be turned on again. After switching from the preset image to the first grayscale image, and lighting the first grayscale image for the second preset duration, the camera device is used to collect the brightness data of each pixel at this time, and calculate the brightness data in each pixel group respectively. The average value of the brightness data of the pixels is then obtained, and the second average brightness value of the pixels in each pixel group after switching to the first grayscale picture for the second preset time period is obtained.

Therefore, the second average luminance value of the pixels in the ith pixel group is:

表示第i个像素组内的像素的第二平均亮度值，x_Bij表示第i个像素组内的第j个像素在由预设画面切换至第一灰阶画面第二预设时长后的亮度数据，N表示第i个像素组内的像素数量。in,

Indicates the second average brightness value of the pixels in the ith pixel group, x _Bij represents the brightness of the jth pixel in the ith pixel group after switching from the preset image to the first grayscale image for the second preset duration data, N represents the number of pixels in the ith pixel group.

As shown in FIG. 2 , the preset picture can be a 7×5 black and white checkerboard picture, wherein the grayscale values of black area 1, black area 3, black area 5 and black area 35 can be Gray0, white area 2, white area The grayscale values of area 4, white area 6 and white area 34 may be Gray255.

Switch the first grayscale screen with grayscale value of Gray127 to a 7×5 black and white checkerboard screen. After lighting the 7×5 black and white checkerboard screen for Y hours, switch to the first grayscale screen with a grayscale value of Gray127 again. After lighting the first grayscale picture with the grayscale value of Gray127 for one hour, collect the brightness data of each pixel at this time, and calculate the second average brightness value of the pixels in each pixel group.

The preset picture may also be other forms of pictures, such as an 8×6 black and white checkerboard picture, or a 7×5 checkerboard picture, which includes a first sub-picture and a second sub-picture, and the first sub-picture The grayscale value of the second sub-picture is Gray245, and the grayscale value of the second sub-picture is Gray10, etc.; in addition, the lighting duration Y of the preset picture, that is, the first preset duration can be 168 hours, 100 hours, etc., and the second preset duration It can be 1 hour, 0.5 hours, etc.

Step 103: Determine the afterimage state of the display panel according to the first average brightness value and the second average brightness value; the afterimage state includes the afterimage type and/or the afterimage level.

In the embodiment of the present invention, the afterimage state of the display panel is determined according to the first average luminance value of the pixels in each pixel group and the second average luminance value of the pixels in each pixel group. Wherein, the afterimage state includes the afterimage type and/or the afterimage level.

In the embodiment of the present invention, by acquiring the first average luminance value of the pixels in each pixel group when the display panel displays the first grayscale picture, the display panel is switched from the first grayscale picture to the preset picture and maintained After the first preset duration, and the preset image is switched to the first grayscale image again and maintained for the second preset duration, the second average brightness value of the pixels in each pixel group is obtained, and the second average brightness value of the pixels in each pixel group is obtained. The second average brightness value determines the afterimage state of the display panel, where the afterimage state includes the afterimage type and/or the afterimage level. By displaying the first average brightness value of the pixels in each pixel group when the first grayscale picture is displayed, and switching from the first grayscale picture to the preset picture, and then switching from the preset picture to the first grayscale picture again The second average brightness value of the pixels in each pixel group, automatically calculates the afterimage state of the display panel, ensures that the calculated afterimage type and/or afterimage level will not be different due to people’s subjective consciousness, and improves the accuracy of the judgment result. Accuracy and Judgment Efficiency.

Embodiment 2

Referring to FIG. 3 , a flowchart of another method for determining an afterimage of a display panel according to an embodiment of the present invention is shown, which may specifically include the following steps:

Step 301: Obtain a first average luminance value of pixels in each pixel group when the display panel displays the first grayscale image; the display panel includes a plurality of pixel groups.

The principle of this step is similar to that of step 101 in the above-mentioned first embodiment, and details are not repeated here.

Step 302: Switch the display panel from the first grayscale image to a preset image and maintain a first preset duration, and switch from the preset image to the first grayscale image again and maintain a second grayscale image After the preset time period, the second average brightness value of the pixels in each pixel group is acquired.

The principle of this step is similar to that of step 102 in the above-mentioned first embodiment, and details are not repeated here.

Step 303: Acquire the first luminance variance value of the pixels in each pixel group when the display panel displays the second grayscale picture.

In the embodiment of the present invention, the display panel is lit with a second grayscale picture, and after the brightness of the second grayscale picture is stabilized, a camera device is used to collect the brightness data of each pixel in the second grayscale picture, respectively. The variance value of the luminance data of the pixels in each pixel group is calculated, and then the first luminance variance value of the pixels in each pixel group is obtained when the display panel displays the second grayscale picture.

Therefore, the first luminance variance value of the pixels in the ith pixel group is:

表示第i个像素组内的像素的第一亮度方差值，x_Cij表示第i个像素组内的第j个像素在显示第二灰阶画面时的亮度数据，

表示第i个像素组内的像素的第三平均亮度值，N表示第i个像素组内的像素数量。in,

represents the first brightness variance value of the pixels in the ith pixel group, x _Cij represents the brightness data of the jth pixel in the ith pixel group when the second grayscale picture is displayed,

represents the third average luminance value of the pixels in the ith pixel group, and N represents the number of pixels in the ith pixel group.

It should be noted that the grayscale value of the second grayscale picture may be Gray255.

Step 304: Obtain a second luminance variance value of pixels in each pixel group when the display panel displays a third grayscale picture.

In the embodiment of the present invention, the display panel is lit with a third grayscale picture, and after the brightness of the third grayscale picture is stabilized, a camera device is used to collect the brightness data of each pixel in the third grayscale picture, respectively, Calculate the variance value of the luminance data of the pixels in each pixel group, and then obtain the second luminance variance value of the pixels in each pixel group when the display panel displays the third grayscale picture.

Therefore, the second luminance variance value of the pixels in the ith pixel group is:

表示第i个像素组内的像素的第二亮度方差值，x_Dij表示第i个像素组内的第j个像素在显示第三灰阶画面时的亮度数据，

表示第i个像素组内的像素的第四平均亮度值，N表示第i个像素组内的像素数量。in,

represents the second luminance variance value of the pixels in the ith pixel group, x _Dij represents the brightness data of the jth pixel in the ith pixel group when the third grayscale picture is displayed,

represents the fourth average luminance value of the pixels in the ith pixel group, and N represents the number of pixels in the ith pixel group.

It should be noted that the gray-scale value of the third gray-scale picture may be Gray0; the third gray-scale picture may be a display panel that switches to the third gray-scale picture after displaying the second gray-scale picture for a certain period of time, or may be a display panel. The panel directly displays the third grayscale picture; and the second grayscale picture and the third grayscale picture can be displayed before the first grayscale picture and the preset picture are displayed.

Step 305, acquiring the third luminance variance value of the pixels in each pixel group when the display panel displays the preset picture; the preset picture includes a first sub-picture and a second sub-picture, The gray-scale value of the first sub-picture is the same as the gray-scale value of the second gray-scale picture, and the gray-scale value of the second sub-picture is the same as the gray-scale value of the third gray-scale picture.

In the embodiment of the present invention, the display panel is switched from a first grayscale image to a preset image, and after the preset image is lit for a first preset duration, a camera device is used to collect brightness data of each pixel in the preset image .

The preset picture includes a first sub-picture and a second sub-picture, and the variance values of the luminance data of the pixels of the pixel groups in the first sub-picture are calculated respectively to obtain the value of the brightness in the first sub-picture when the display panel displays the preset picture. The third brightness variance value of the pixels of each pixel group, correspondingly, the variance value of the brightness data of the pixels of the pixel group in the second sub-picture is calculated respectively, so as to obtain the second sub-picture when the display panel displays the preset picture. The third luminance variance value of the pixels of each pixel group in the picture.

The grayscale value of the first sub-picture is the same as the gray-scale value of the second gray-scale picture, and the gray-scale value of the second sub-picture is the same as the gray-scale value of the third grayscale picture.

When the grayscale value of the second grayscale picture is Gray255, and the grayscale value of the third grayscale picture is Gray0, the grayscale value of the first subpicture is Gray255, and the grayscale value of the second subpicture is Gray0. Therefore, The preset picture may be a black and white checkerboard picture, for example, the 7×5 black and white checkerboard picture shown in FIG. 2 .

Therefore, the third luminance variance value of the pixels of the ith pixel group in the first sub-picture is:

表示第一子画面内的第i个像素组内的像素的第三亮度方差值，x_Eij表示第一子画面内的第i个像素组内的第j个像素在显示预设画面时的亮度数据，

表示第一子画面内的第i个像素组内的像素的第五平均亮度值，N表示第i个像素组内的像素数量。in,

Represents the third luminance variance value of the pixel in the i-th pixel group in the first sub-picture, x _Eij represents the j-th pixel in the i-th pixel group in the first sub-picture when the preset picture is displayed luminance data,

represents the fifth average luminance value of the pixels in the ith pixel group in the first sub-picture, and N represents the number of pixels in the ith pixel group.

Correspondingly, the third luminance variance value of the pixels of the ith pixel group in the second sub-picture is:

表示第二子画面内的第i个像素组内的像素的第三亮度方差值，x_Fij表示第二子画面内的第i个像素组内的第j个像素在显示预设画面时的亮度数据，

表示第二子画面内的第i个像素组内的像素的第五平均亮度值，N表示第i个像素组内的像素数量。in,

Represents the third luminance variance value of the pixels in the i-th pixel group in the second sub-picture, and x _Fij represents the j-th pixel in the i-th pixel group in the second sub-picture when the preset picture is displayed. luminance data,

represents the fifth average luminance value of the pixels in the ith pixel group in the second sub-picture, and N represents the number of pixels in the ith pixel group.

Step 306, according to the third luminance variance value of the pixel group in the first sub-picture and the first luminance variance value, and/or the third luminance variance of the pixel group in the second sub-picture value and the second luminance variance value to determine an abnormal pixel group.

In this embodiment of the present invention, according to the third luminance variance value of the pixel group in the first sub-picture and the corresponding first luminance variance value, and/or the third luminance variance of the pixel group in the second sub-picture value and the corresponding second luminance variance value to determine the abnormal pixel group.

Specifically, when the absolute value of the difference between the third luminance variance value of the pixel group in the first sub-picture and the first luminance variance value is greater than a third set threshold, it is determined that the A pixel group in a sub-picture is an abnormal pixel group; when the absolute value of the difference between the third luminance variance value and the second luminance variance value of the pixel group in the second sub-picture is greater than the fourth When the threshold is set, the pixel group in the second sub-picture is determined to be an abnormal pixel group.

则确定第一子画面内的第i个像素组为异常像素组；当第二子画面内的像素组的第三亮度方差值与对应的第二亮度方差值之间的差值的绝对值大于第四设定阈值时，即

则确定第二画面内的第i个像素组为异常像素组。When the absolute value of the difference between the third luminance variance value of the pixel group in the first sub-picture and the corresponding first luminance variance value is greater than the third set threshold, that is,

Then it is determined that the i-th pixel group in the first sub-picture is an abnormal pixel group; when the absolute value of the difference between the third luminance variance value of the pixel group in the second sub-picture and the corresponding second luminance variance value is When the value is greater than the fourth set threshold, that is,

Then, it is determined that the i-th pixel group in the second picture is an abnormal pixel group.

The third set threshold value is L1, the fourth set threshold value is L2, and the specific values of the third set threshold value L1 and the fourth set threshold value L2 can be obtained through multiple experiments.

Step 307: Remove the first average brightness value and the second average brightness value of the abnormal pixel group.

In the embodiment of the present invention, the first average brightness value and the second average brightness value of the pixels in the abnormal pixel group are removed, so as to avoid the display of some abnormal pixels in the display panel, which affects the calculation result of the subsequent afterimage type and/or afterimage level to further improve the accuracy of the judgment results.

The first average luminance value and the second average luminance value involved in the subsequent steps 308 to 311 are both the first average luminance value and the second average luminance value of the pixel group after removing the abnormal pixel group.

It should be noted that, if no abnormal pixel group is detected in step 306, it is not necessary to remove the first average brightness value and the second average brightness value of the abnormal pixel group.

Step 308, when the difference between the average value of the second average luminance value of the pixel group in the first pixel area and the average value of the first average luminance value is greater than the first set threshold, determine the display panel The afterimage type is white afterimage.

In this embodiment of the present invention, the preset picture includes a first sub-picture located in the first pixel area and a second sub-picture located in the second pixel area, and the gray-scale value of the first sub-picture is greater than the preset gray-scale value , the grayscale value of the second sub-picture is smaller than the preset grayscale value.

For example, the preset grayscale value may be Gray127, the grayscale value of the first subpicture may be Gray255, and the grayscale value of the second subpicture may be Gray0.

The average values of the second average luminance values of the pixel groups in the first pixel area are respectively calculated as:

表示第一像素区域内的像素组的第二平均亮度值的平均值，

表示第i个像素组内的像素的第二平均亮度值，M为第一像素区域内的去除异常像素组后的像素组数量。in,

represents the average value of the second average luminance value of the pixel group in the first pixel area,

represents the second average luminance value of the pixels in the ith pixel group, and M is the number of pixel groups in the first pixel area after removing the abnormal pixel group.

The average value of the first average luminance values of the pixel groups in the first pixel area is calculated as:

表示第一像素区域内的像素组的第一平均亮度值的平均值，

表示第i个像素组内的像素的第一平均亮度值，M为第一像素区域内的去除异常像素组后的像素组数量。in,

represents the average value of the first average luminance values of the pixel groups in the first pixel area,

represents the first average brightness value of the pixels in the ith pixel group, and M is the number of pixel groups in the first pixel area after removing the abnormal pixel group.

确定显示面板的残像类型为白残像。When the difference between the average value of the second average luminance value of the pixel group in the first pixel area and the average value of the first average luminance value is greater than the first set threshold, that is,

Make sure the afterimage type of the display panel is white afterimage.

The first set threshold value is K1, and the specific value of the first set threshold value K1 can be obtained through multiple experiments.

Step 309, when the difference between the average value of the first average brightness value of the pixel group in the second pixel area and the average value of the second average brightness value is greater than the second set threshold, determine the display panel The afterimage type is black afterimage.

In the embodiment of the present invention, the average value of the first average brightness values of the pixel groups in the second pixel area is calculated as:

表示第二像素区域内的像素组的第一平均亮度值的平均值，

表示第i个像素组内的像素的第一平均亮度值，V为第二像素区域内的去除异常像素组后的像素组数量。in,

represents the average value of the first average luminance values of the pixel groups in the second pixel area,

represents the first average brightness value of the pixels in the ith pixel group, and V is the number of pixel groups in the second pixel area after removing the abnormal pixel group.

The average value of the second average luminance value of the pixel group in the second pixel area is calculated as:

表示第二像素区域内的像素组的第二平均亮度值的平均值，

表示第i个像素组内的像素的第二平均亮度值，V为第二像素区域内的去除异常像素组后的像素组数量。in,

represents the average value of the second average luminance value of the pixel group in the second pixel area,

represents the second average luminance value of the pixels in the ith pixel group, and V is the number of pixel groups in the second pixel area after removing the abnormal pixel group.

确定显示面板的残像类型为黑残像。When the difference between the average value of the first average brightness value of the pixel group in the second pixel area and the average value of the second average brightness value is greater than the second set threshold, that is,

Make sure the afterimage type of the display panel is black afterimage.

Wherein, the second set threshold value is K2, and the specific value of the second set threshold value K2 can be obtained through multiple experiments.

It should be noted that, when both the display panels meet the conditions of step 308 and step 309, it is determined that the display panel has both a white afterimage and a black afterimage.

Step 310: Calculate the average value of the square of the difference between the first average luminance value and the second average luminance value of each pixel group to obtain an afterimage coefficient.

In the embodiment of the present invention, the square of the difference between the first average brightness value and the second average brightness value of each pixel group after removing the abnormal pixel group is calculated, and the average value is calculated to obtain the residual image coefficient.

Therefore, the afterimage coefficient is:

表示第i个像素组内的像素的第二平均亮度值。Among them, P represents the residual image coefficient, M+V represents the number of pixel groups in the display panel after removing the abnormal pixel group, X _Ai represents the first average brightness value of the pixels in the ith pixel group,

represents the second average luminance value of the pixels in the ith pixel group.

Step 311: Determine an afterimage level of the display panel according to the corresponding relationship between the afterimage coefficient and a preset afterimage level.

In the embodiment of the present invention, the afterimage level of the display panel is determined according to the corresponding relationship between the afterimage coefficient P and the preset afterimage level.

For example, the preset corresponding relationship of the afterimage level is: when the afterimage coefficient P≤P ₁ , the afterimage level is Q1; when the afterimage coefficient P1<P<P2, the afterimage level is _{Q2 ;} when the afterimage coefficient _P≥P2 , the afterimage level is Q3; after the afterimage coefficient P is calculated and obtained, according to the preset afterimage level correspondence, if it is determined that the afterimage coefficient P satisfies P ₁ <P < P ₂ , the afterimage level is determined to be Q2.

Among them, the specific values of P ₁ and P ₂ can be obtained through many experiments.

In the embodiment of the present invention, the first average brightness value of the pixels in each pixel group when the first grayscale picture is displayed, and switching from the first grayscale picture to the preset picture, and then switching from the preset picture again After reaching the second average brightness value of the pixels in each pixel group after the first grayscale picture, the afterimage state of the display panel is automatically calculated to ensure that the calculated afterimage type and/or afterimage level will not be affected by human subjective consciousness. The difference is to improve the accuracy of the judgment result and the judgment efficiency; and according to the first brightness variance value of the pixels in each pixel group when the display panel is displaying the second grayscale picture, each time when the third grayscale picture is displayed. The second brightness variance value of the pixels in the pixel groups, and the third brightness variance value of the pixels in each pixel group when the preset picture is displayed, determine the abnormal pixel group of the display panel, and remove the abnormal pixel group. An average brightness value and a second average brightness value further improve the accuracy of the calculation result of the afterimage type and/or the afterimage level.

Embodiment 3

Referring to FIG. 4 , a structural block diagram of a device for determining afterimage of a display panel according to an embodiment of the present invention is shown.

The afterimage determination device 400 of the display panel according to the embodiment of the present invention includes:

The first average brightness value obtaining module 401 is configured to obtain the first average brightness value of the pixels in each pixel group when the display panel displays the first grayscale picture; the display panel includes a plurality of pixel groups;

The second average brightness value acquiring module 402 is configured to switch the display panel from the first grayscale image to a preset image for a first preset duration, and switch from the preset image to the preset image again After the first grayscale picture is maintained for the second preset duration, the second average luminance value of the pixels in each pixel group is obtained;

The afterimage state determination module 403 is configured to determine the afterimage state of the display panel according to the first average brightness value and the second average brightness value; the afterimage state includes afterimage type and/or afterimage level.

Referring to FIG. 5 , a structural block diagram of another apparatus for determining an afterimage of a display panel according to an embodiment of the present invention is shown.

On the basis of FIG. 4 , preferably, the preset picture includes a first sub-picture located in a first pixel area and a second sub-picture located in a second pixel area, and the gray scale of the first sub-picture is The value is greater than the preset grayscale value, and the grayscale value of the second sub-picture is smaller than the preset grayscale value; the afterimage state determination module 403 includes:

The first determination sub-module 4031 of the afterimage type is configured to, when the difference between the average value of the second average brightness value of the pixel group in the first pixel area and the average value of the first average brightness value is greater than the first set value. When determining the threshold, it is determined that the afterimage type of the display panel is a white afterimage;

The second determination sub-module 4032 of the afterimage type is configured to, when the difference between the average value of the first average brightness value of the pixel group in the second pixel area and the average value of the second average brightness value is greater than the second set value. When the threshold is determined, it is determined that the afterimage type of the display panel is a black afterimage.

Preferably, the afterimage state determination module 403 includes:

The afterimage coefficient calculation submodule 4033 is configured to calculate the average value of the square of the difference between the first average brightness value and the second average brightness value of each pixel group to obtain the afterimage coefficient;

The afterimage level determination sub-module 4034 is configured to determine the afterimage level of the display panel according to the corresponding relationship between the afterimage coefficient and the preset afterimage level.

Preferably, the afterimage determination device 400 of the display panel further includes:

The first luminance variance value obtaining module 404 is configured to obtain the first luminance variance value of the pixels in each pixel group when the display panel displays the second grayscale picture;

The second brightness variance value acquiring module 405 is configured to acquire the second brightness variance value of the pixels in each pixel group when the display panel displays the third grayscale picture;

The third luminance variance value obtaining module 406 is configured to obtain the third luminance variance value of the pixels in each pixel group when the display panel displays the preset picture; the preset picture includes A first sub-picture and a second sub-picture, the gray-scale value of the first sub-picture is the same as the gray-scale value of the second gray-scale picture, and the gray-scale value of the second sub-picture is the same as the third gray-scale value The grayscale value of the grayscale picture is the same;

The abnormal pixel group determination module 407 is configured to determine according to the third luminance variance value of the pixel group in the first sub-picture and the first luminance variance value, and/or the pixels in the second sub-picture the third brightness variance value of the group and the second brightness variance value to determine an abnormal pixel group;

The luminance value removing module 408 is configured to remove the first average luminance value and the second average luminance value of the abnormal pixel group.

Preferably, the abnormal pixel group determination module 407 includes:

The first determination sub-module 4071 of the abnormal pixel group is configured to, when the absolute value of the difference between the third brightness variance value of the pixel group in the first sub-picture and the first brightness variance value is greater than the first brightness variance value. 3. When the threshold is set, determine that the pixel group in the first sub-picture is an abnormal pixel group;

The second determination sub-module 4072 of the abnormal pixel group is configured to, when the absolute value of the difference between the third brightness variance value of the pixel group in the second sub-picture and the second brightness variance value is greater than the third brightness variance value. 4. When the threshold is set, it is determined that the pixel group in the second sub-picture is an abnormal pixel group.

In the embodiment of the present invention, by acquiring the first average luminance value of the pixels in each pixel group when the display panel displays the first grayscale picture, the display panel is switched from the first grayscale picture to the preset picture and maintained After the first preset duration, and the preset image is switched to the first grayscale image again and maintained for the second preset duration, the second average brightness value of the pixels in each pixel group is obtained, and the second average brightness value of the pixels in each pixel group is obtained. The second average brightness value determines the afterimage state of the display panel, where the afterimage state includes the afterimage type and/or the afterimage level. By displaying the first average brightness value of the pixels in each pixel group when the first grayscale picture is displayed, and switching from the first grayscale picture to the preset picture, and then switching from the preset picture to the first grayscale picture again The second average brightness value of the pixels in each pixel group, automatically calculates the afterimage state of the display panel, ensures that the calculated afterimage type and/or afterimage level will not be different due to people’s subjective consciousness, and improves the accuracy of the judgment result. Accuracy and Judgment Efficiency.

For the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, Certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments may be referred to each other.

Finally, it should also be noted that in this document, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply these entities or that there is any such actual relationship or sequence between operations. Furthermore, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article of manufacture or device comprising a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, commodity or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article of manufacture, or device that includes the element.

The method and device for determining afterimage of a display panel provided by the present invention have been described in detail above. The principles and implementations of the present invention are described with specific examples in this paper. The descriptions of the above embodiments are only used to help understanding The method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be It is understood as a limitation of the present invention.

Claims (8)

1. A method for determining an afterimage of a display panel, comprising: acquiring a first average luminance value of pixels in each pixel group when the display panel displays a first grayscale picture; the display panel includes a plurality of pixel groups; Switching the display panel from the first grayscale image to a preset image and maintaining a first preset duration, and switching from the preset image to the first grayscale image again and maintaining a second preset duration After that, obtain the second average brightness value of the pixels in each pixel group; acquiring the first luminance variance value of the pixels in each pixel group when the display panel displays the second grayscale picture; acquiring the second luminance variance value of the pixels in each pixel group when the display panel displays the third grayscale picture; When the display panel displays the preset picture, the third luminance variance value of the pixels in each pixel group is acquired; the preset picture includes a first sub-picture and a second sub-picture, and the first sub-picture The grayscale value of a sub-picture is the same as the grayscale value of the second grayscale picture, and the grayscale value of the second subpicture is the same as the grayscale value of the third grayscale picture; According to the third brightness variance value of the pixel group in the first sub-picture and the first brightness variance value, and/or the third brightness variance value of the pixel group in the second sub-picture and the The second brightness variance value is used to determine the abnormal pixel group; removing the first average brightness value and the second average brightness value of the abnormal pixel group; An afterimage state of the display panel is determined according to the first average brightness value and the second average brightness value; the afterimage state includes an afterimage type and/or an afterimage level. 2 . The method according to claim 1 , wherein the preset picture comprises a first sub-picture located in a first pixel area and a second sub-picture located in a second pixel area, and the first sub-picture is located in the second pixel area. 3 . The gray-scale value of the sub-picture is greater than the preset gray-scale value, and the gray-scale value of the second sub-picture is smaller than the preset gray-scale value; the first average brightness value and the second average brightness value are based on the , the step of determining the afterimage state of the display panel includes: When the difference between the average value of the second average luminance value of the pixel group in the first pixel area and the average value of the first average luminance value is greater than the first set threshold, determine the afterimage type of the display panel white afterimage; When the difference between the average value of the first average luminance value of the pixel group in the second pixel area and the average value of the second average luminance value is greater than the second set threshold, determining the afterimage type of the display panel For the black afterimage. 3. The method according to claim 1, wherein the step of determining the afterimage state of the display panel according to the first average luminance value and the second average luminance value comprises: Calculate the average value of the square of the difference between the first average brightness value and the second average brightness value of each pixel group to obtain the residual image coefficient; The afterimage level of the display panel is determined according to the corresponding relationship between the afterimage coefficient and the preset afterimage level. 4. The method according to claim 1, wherein the third luminance variance value and the first luminance variance value according to the pixel group in the first sub-picture, and/or the The step of determining the abnormal pixel group by the third luminance variance value and the second luminance variance value of the pixel group in the second sub-picture includes: When the absolute value of the difference between the third luminance variance value of the pixel group in the first sub-picture and the first luminance variance value is greater than a third set threshold, determine the first sub-picture The pixel group inside is an abnormal pixel group; When the absolute value of the difference between the third luminance variance value of the pixel group in the second sub-picture and the second luminance variance value is greater than the fourth set threshold, determine the second sub-picture The pixel group inside is an abnormal pixel group. 5. A device for determining an afterimage of a display panel, comprising: a first average luminance value acquisition module, configured to acquire a first average luminance value of pixels in each pixel group when the display panel displays a first grayscale image; the display panel includes a plurality of pixel groups; The second average brightness value acquisition module is configured to switch the display panel from the first grayscale image to a preset image for a first preset duration, and switch from the preset image to the first image again After a grayscale image is maintained for a second preset duration, the second average luminance value of the pixels in each pixel group is obtained; an afterimage state determination module, configured to determine an afterimage state of the display panel according to the first average brightness value and the second average brightness value; the afterimage state includes afterimage type and/or afterimage level; a first brightness variance value acquisition module, configured to acquire the first brightness variance value of the pixels in each pixel group when the display panel displays the second grayscale picture; A second luminance variance value acquisition module, configured to acquire a second luminance variance value of pixels in each pixel group when the display panel displays a third grayscale image; A third luminance variance value obtaining module is configured to obtain a third luminance variance value of the pixels in each pixel group when the display panel displays the preset picture; the preset picture includes a third luminance variance value. A sub-picture and a second sub-picture, the gray-scale value of the first sub-picture is the same as the gray-scale value of the second gray-scale picture, and the gray-scale value of the second sub-picture is the same as the third gray-scale value The grayscale value of the screen is the same; An abnormal pixel group determination module, configured to determine according to the third luminance variance value of the pixel group in the first sub-picture and the first luminance variance value, and/or the pixel group in the second sub-picture The third brightness variance value and the second brightness variance value of , determine the abnormal pixel group; The luminance value removing module is configured to remove the first average luminance value and the second average luminance value of the abnormal pixel group. 6 . The device according to claim 5 , wherein the preset picture comprises a first sub-picture located in a first pixel area and a second sub-picture located in a second pixel area, and the first sub-picture is located in the second pixel area. 7 . The grayscale value of the picture is greater than the preset grayscale value, and the grayscale value of the second sub-picture is smaller than the preset grayscale value; the afterimage state determination module includes: The first submodule for determining the afterimage type is configured to, when the difference between the average value of the second average luminance value of the pixel group in the first pixel area and the average value of the first average luminance value is greater than the first setting When the threshold is determined, the afterimage type of the display panel is determined to be a white afterimage; a second determination sub-module of the afterimage type, configured to when the difference between the average value of the first average brightness value of the pixel group in the second pixel area and the average value of the second average brightness value is greater than the second setting When the threshold value is set, it is determined that the afterimage type of the display panel is a black afterimage. 7. The device according to claim 5, wherein the afterimage state determination module comprises: an afterimage coefficient calculation submodule, configured to calculate the average value of the square of the difference between the first average brightness value and the second average brightness value of each pixel group to obtain the afterimage coefficient; The afterimage level determination submodule is configured to determine the afterimage level of the display panel according to the corresponding relationship between the afterimage coefficient and the preset afterimage level. 8. The device according to claim 5, wherein the abnormal pixel group determination module comprises: The first submodule for determining abnormal pixel groups is configured to, when the absolute value of the difference between the third luminance variance value of the pixel group in the first sub-picture and the first luminance variance value is greater than the third When setting the threshold, determine that the pixel group in the first sub-picture is an abnormal pixel group; The second determination sub-module of abnormal pixel group is configured to be configured when the absolute value of the difference between the third luminance variance value of the pixel group in the second sub-picture and the second luminance variance value is greater than the fourth When the threshold is set, the pixel group in the second sub-picture is determined to be an abnormal pixel group.

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