CN109345986B - Residual image judgment method and device of display panel - Google Patents
Residual image judgment method and device of display panel Download PDFInfo
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Abstract
The invention provides a method and a device for judging residual images of a display panel, and relates to the technical field of display. According to the invention, when the display panel displays the first gray scale picture, the first average brightness value of the pixels in each pixel group is obtained, the display panel is switched from the first gray scale picture to the preset picture, and after the preset picture is switched to the first gray scale picture again, the second average brightness value of the pixels in each pixel group is obtained, and the residual image state of the display panel is determined according to the first average brightness value and the second average brightness value. The residual image state of the display panel is automatically calculated through the first average brightness value of the pixels in each pixel group when the first gray scale picture is displayed and the second average brightness value of the pixels in each pixel group after the preset picture is switched to the first gray scale picture, the residual image type and/or the residual image grade obtained through calculation are guaranteed not to be different due to subjective consciousness of people, and the accuracy of the judgment result and the judgment efficiency are improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a method and an apparatus for determining an afterimage of a display panel.
Background
Along with the continuous development of display technology, people also become higher and higher to display panel's requirement, display panel also develops to jumbo size, the direction of high-resolution gradually, but along with display panel's resolution ratio improvement, display panel's pixel is littleer, TFT's (Thin Film Transistor) characteristic is difficult for the management and control, the symmetry is hardly accomplished to the voltage of applying at the liquid crystal both ends, make the ion in the liquid crystal box form electric field effect to one end gathering on the one hand, on the other hand makes the performance variation of liquid crystal, lead to aggravating of afterimage, and simultaneously, the afterimage also can be produced to the charge-up time is not enough. The afterimage means that when the display panel holds a still picture for a long time, traces of the previous still picture can still be seen on the display panel when other pictures are displayed.
At present, the type and grade of the residual image of the display panel are mainly judged by visual inspection of human eyes, but the method for judging the residual image by the human eyes has strong subjectivity, low accuracy of the judgment result and low judgment efficiency.
Disclosure of Invention
The invention provides a method and a device for judging an afterimage of a display panel, which aim to solve the problems of low accuracy and efficiency of the conventional afterimage judging method.
In order to solve the above problem, the present invention discloses a method for determining an afterimage of a display panel, comprising:
acquiring a first average brightness value of pixels in each pixel group when a display panel displays a first gray scale picture; the display panel includes a plurality of pixel groups;
switching the display panel from the first gray scale picture to a preset picture and maintaining a first preset time length, and obtaining a second average brightness value of the pixels in each pixel group after switching the preset picture to the first gray scale picture again and maintaining a second preset time length;
determining the afterimage state of the display panel according to the first average brightness value and the second average brightness value; the afterimage status includes an afterimage type and/or an afterimage level.
Preferably, the preset frame includes a first sub-frame located in the first pixel region and a second sub-frame located in the second pixel region, and a gray level of the first sub-frame is greater than a preset gray level, and a gray level of the second sub-frame is less than the preset gray level; 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:
when the difference value between the average value of the second average brightness values and the average value of the first average brightness values of the pixel groups in the first pixel region is larger than a first set threshold value, determining that the afterimage type of the display panel is a white afterimage;
and when the difference value between the average value of the first average brightness values and the average value of the second average brightness values of the pixel groups in the second pixel region is larger than a second set threshold value, determining that the afterimage type of the display panel is 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:
calculating the square of the difference value between the first average brightness value and the second average brightness value of each pixel group, and calculating the average value to obtain a residual image coefficient;
and determining the afterimage grade of the display panel according to the corresponding relation between the afterimage coefficient and the preset afterimage grade.
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 a first brightness variance value of pixels in each pixel group when the display panel displays a second gray scale picture;
acquiring a second brightness variance value of the pixels in each pixel group when the display panel displays a third gray scale picture;
acquiring a third brightness variance value of the pixels in each pixel group when the display panel displays the preset picture; the preset picture comprises a first sub-picture and a second sub-picture, the gray scale value of the first sub-picture is the same as that of the second gray scale picture, and the gray scale value of the second sub-picture is the same as that of the third gray scale picture;
determining an abnormal pixel group according to a third brightness variance value of the pixel group in the first sub-picture and the first brightness variance value, and/or a third brightness variance value of the pixel group in the second sub-picture and the second brightness variance value;
and removing the first average brightness value and the second average brightness value of the abnormal pixel group.
Preferably, the step of determining an abnormal pixel group 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 value of the pixel group in the second sub-picture and the second luminance variance value includes:
when the absolute value of the difference value between the third brightness variance value of the pixel group in the first sub-picture and the first brightness variance value is larger than a third set threshold, determining the pixel group in the first sub-picture as an abnormal pixel group;
and when the absolute value of the difference value between the third brightness variance value and the second brightness variance value of the pixel group in the second sub-picture is greater than a fourth set threshold, determining that the pixel group in the second sub-picture is an abnormal pixel group.
In order to solve the above problem, the present invention also discloses an afterimage determination device for a display panel, comprising:
the first average brightness value acquisition module is configured to acquire a first average brightness value of pixels in each pixel group when the display panel displays a first gray-scale picture; 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 gray scale picture to a preset picture and maintain a first preset time length, and acquire a second average brightness value of the pixels in each pixel group after the preset picture is switched to the first gray scale picture again and maintains a second preset time length;
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 status includes an afterimage type and/or an afterimage level.
Preferably, the preset frame includes a first sub-frame located in the first pixel region and a second sub-frame located in the second pixel region, and a gray level of the first sub-frame is greater than a preset gray level, and a gray level of the second sub-frame is less than the preset gray level; the afterimage state determination module comprises:
an afterimage type first determination sub-module configured to determine that an afterimage type of the display panel is a white afterimage when a difference between an average value of second average luminance values and an average value of first average luminance values of a pixel group within the first pixel region is greater than a first set threshold;
an afterimage type second determination sub-module configured to determine that the afterimage type of the display panel is a black afterimage when a difference between an average value of the first average luminance values and an average value of the second average luminance values of the pixel group within the second pixel region is greater than a second set threshold.
Preferably, the afterimage state determining module includes:
the residual image coefficient calculation submodule is configured to calculate an average value of the square of the difference value between the first average brightness value and the second average brightness value of each pixel group to obtain a residual image coefficient;
and the afterimage grade determining submodule is configured to determine the afterimage grade of the display panel according to the corresponding relation between the afterimage coefficient and the preset afterimage grade.
Preferably, the method further comprises the following steps:
a first luminance variance value obtaining module configured to obtain a first luminance variance value of pixels in each pixel group when the display panel displays a second gray scale picture;
a second brightness variance value obtaining module configured to obtain a second brightness variance value of the pixels in each pixel group when the display panel displays a third grayscale picture;
a third luminance variance value obtaining module configured to obtain a third luminance variance value of pixels in each pixel group when the display panel displays the preset picture; the preset picture comprises a first sub-picture and a second sub-picture, the gray scale value of the first sub-picture is the same as that of the second gray scale picture, and the gray scale value of the second sub-picture is the same as that of the third gray scale picture;
an abnormal pixel group determination module configured to determine an abnormal pixel group according to a third luminance variance value of a pixel group within the first sub-picture and the first luminance variance value, and/or a third luminance variance value of a pixel group within the second sub-picture and the second luminance variance value;
a luminance value removal module configured to remove the first and second average luminance values of the abnormal pixel group.
Preferably, the abnormal pixel group determining module includes:
an abnormal pixel group first determination sub-module configured to determine a pixel group within the first sub-picture as an abnormal pixel group when an absolute value of a difference between a third luminance variance value of the pixel group within the first sub-picture and the first luminance variance value is greater than a third set threshold;
an abnormal pixel group second determination sub-module configured to determine the pixel group within the second sub-picture as an abnormal pixel group when an absolute value of a difference between a third luminance variance value and the second luminance variance value of the pixel group within the second sub-picture is greater than a fourth set threshold.
Compared with the prior art, the invention has the following advantages:
the method comprises the steps of obtaining a first average brightness value of pixels in each pixel group when a display panel displays a first gray scale picture, switching the display panel from the first gray scale picture to a preset picture and maintaining the first preset time length, obtaining a second average brightness value of the pixels in each pixel group after the preset picture is switched to the first gray scale picture again and the second preset time length is maintained, and determining the residual image state of the display panel according to the first average brightness value and the second average brightness value, wherein the residual image state comprises the residual image type and/or the residual image grade. The residual image state of the display panel is automatically calculated by displaying the first average brightness value of the pixels in each pixel group when the first gray scale picture is displayed, switching the first gray scale picture to the preset picture, and switching the preset picture to the second average brightness value of the pixels in each pixel group after the first gray scale picture is switched again, so that the residual image type and/or the residual image grade obtained by calculation are ensured not to be different due to subjective consciousness of people, and the accuracy and the judgment efficiency of the judgment result are improved.
Drawings
FIG. 1 is a flow chart illustrating a method for determining an afterimage of a display panel according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a preset screen according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating an afterimage determination method of a display panel according to another embodiment of the present invention;
FIG. 4 is a block diagram showing the structure of an afterimage determination apparatus of a display panel according to an embodiment of the present invention;
fig. 5 is a block diagram showing another structure of the afterimage determination apparatus of the display panel according to the embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example one
Referring to fig. 1, a flowchart of an afterimage determination method of a display panel according to an embodiment of the present invention is shown, which may specifically include the following steps:
101, acquiring a first average brightness value of pixels in each pixel group when a display panel displays a first gray scale picture; the display panel includes a plurality of pixel groups.
In the embodiment of the invention, the display panel is lightened by the first gray scale picture, and after the brightness of the first gray scale picture is stable, the brightness data of each pixel in the first gray scale picture is collected by using a camera device, such as a camera; the display panel is divided into a plurality of pixel groups, and the average value of the brightness data of the pixels in each pixel group is calculated respectively, so that the first average brightness value of the pixels in each pixel group is obtained when the display panel displays the first gray scale picture.
Thus, the first average luminance value of the pixels within the ith pixel group is:
wherein,
representing a first average luminance value, x, of pixels within an ith pixel groupAijThe luminance data of the jth pixel in the ith pixel group when the jth pixel displays the first gray scale picture is shown, and N represents the number of pixels in the ith pixel group.
It should be noted that the Gray scale value of the first Gray scale frame may be Gray 127; the brightness data of the pixels within a certain time length can be collected through the camera device, when the brightness data do not jump any more, the brightness stability of the first gray scale picture is determined, or the preset time length is set, and when the time length of the first gray scale picture reaches the preset time, the brightness stability of the first gray scale picture can be determined.
The display panel is divided into a plurality of pixel groups in advance, the number of pixels in each pixel group can be 8 × 8, 4 × 4 or 16 × 16, and the like, the number of pixel groups is determined according to the resolution of the display panel and the number of pixels in each pixel group, 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 preferably has the same number of pixels in each pixel group.
When the number of pixels in each pixel group is 8 × 8, N in formula (1) is equal to 64, that is, formula (1) calculates an average value of luminance data of 64 pixels in the ith pixel group.
In the embodiment of the present invention, when determining the afterimage state of the display panel, the display panel may be switched from the first gray scale image to the preset image, the preset image is lit for a first preset time period, the display panel is switched from the preset image to the first gray scale image again, the first gray scale image is lit for a second preset time period, the camera device is used to collect the brightness data of each pixel at the time, the average value of the brightness data of the pixels in each pixel group is respectively calculated, and then the second average brightness value of the pixels in each pixel group after being switched to the first gray scale image for the second preset time period is obtained.
Thus, the second average luminance value of the pixels within the ith pixel group is:
wherein,
representing a second average luminance value, x, of pixels within the ith pixel groupBijAnd the brightness data of the jth pixel in the ith pixel group after the jth pixel is switched from the preset picture to the first gray-scale picture for a second preset time length is represented, and N represents the number of the pixels in the ith pixel group.
As shown in fig. 2, the preset frame may be a 7 × 5 black-and-white checkerboard frame, wherein the Gray levels from the black area 1, the black area 3, the black area 5 to the black area 35 may be Gray0, and the Gray levels from the white area 2, the white area 4, the white area 6 to the white area 34 may be Gray 255.
And switching the first Gray scale picture with the Gray scale value of Gray127 to a 7 x 5 black-and-white checkerboard picture, lightening the 7 x 5 black-and-white checkerboard picture for Y hours, switching to the first Gray scale picture with the Gray scale value of Gray127 again, lightening the first Gray scale picture with the Gray scale value of Gray127 for one hour, collecting the brightness data of each pixel at the moment, and calculating to obtain a second average brightness value of the pixels in each pixel group.
The preset picture may also be a picture in other forms, 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 Gray value of the first sub-picture is Gray245, and the Gray value of the second sub-picture is Gray10, etc.; in addition, the lighting time period Y of the preset frame, that is, the first preset time period may be 168 hours, 100 hours, etc., and the second preset time period may be 1 hour, 0.5 hour, etc.
103, determining an afterimage state of the display panel according to the first average brightness value and the second average brightness value; the afterimage status includes an afterimage type and/or an afterimage level.
In the embodiment of the invention, the afterimage state of the display panel is determined according to the first average brightness value of the pixels in each pixel group and the second average brightness value of the pixels in each pixel group. Wherein the afterimage state comprises an afterimage type and/or an afterimage level.
In the embodiment of the present invention, when the display panel displays the first gray scale image, the first average luminance value of the pixels in each pixel group is obtained, the display panel is switched from the first gray scale image to the preset image and is maintained for the first preset time, and after the preset image is switched to the first gray scale image again and is maintained for the second preset time, the second average luminance value of the pixels in each pixel group is obtained, and the residual image state of the display panel is determined according to the first average luminance value and the second average luminance value, where the residual image state includes a residual image type and/or a residual image level. The residual image state of the display panel is automatically calculated by displaying the first average brightness value of the pixels in each pixel group when the first gray scale picture is displayed, switching the first gray scale picture to the preset picture, and switching the preset picture to the second average brightness value of the pixels in each pixel group after the first gray scale picture is switched again, so that the residual image type and/or the residual image grade obtained by calculation are ensured not to be different due to subjective consciousness of people, and the accuracy and the judgment efficiency of the judgment result are improved.
Example two
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:
301, acquiring a first average brightness value of pixels in each pixel group when a display panel displays a first gray scale picture; the display panel includes a plurality of pixel groups.
This step is similar to the principle of step 101 in the first embodiment, and is not described herein again.
This step is similar to the step 102 in the first embodiment, and is not described herein again.
In the embodiment of the invention, the display panel is lighted up by the second gray scale picture, after the brightness of the second gray scale picture is stable, the camera device is used for collecting the brightness data of each pixel in the second gray scale picture, and the variance value of the brightness data of the pixels in each pixel group is respectively calculated, so that the first brightness variance value of the pixels in each pixel group when the display panel displays the second gray scale picture is obtained.
Therefore, the first luminance variance values of the pixels in the ith pixel group are:
wherein,
representing a first luminance variance value, x, of pixels within an ith pixel groupCijIndicating the luminance data of the jth pixel in the ith pixel group when displaying the second gray scale picture,
a third average luminance value of 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 second Gray scale picture may be Gray 255.
In the embodiment of the invention, the display panel is lighted up by using the third gray scale picture, after the brightness of the third gray scale picture is stable, the camera device is used for collecting the brightness data of each pixel in the third gray scale picture, and the variance value of the brightness data of the pixels in each pixel group is respectively calculated, so that the second brightness variance value of the pixels in each pixel group when the display panel displays the third gray scale picture is obtained.
Therefore, the second luminance variance values of the pixels in the ith pixel group are:
wherein,
representing a second luminance variance value, x, of pixels within the ith pixel groupDijIndicating the brightness data of the jth pixel in the ith pixel group when displaying the third gray scale picture,
represents a fourth average luminance value of pixels within the ith pixel group, and N represents the number of pixels within the ith pixel group.
It should be noted that the Gray scale value of the third Gray scale frame may be Gray 0; the third gray scale picture can be switched to the third gray scale picture after the display panel displays the second gray scale picture for a certain time, or the display panel can directly display the third gray scale picture; and the second gray scale picture and the third gray scale picture can be displayed before the first gray scale picture and the preset picture are displayed.
In the embodiment of the invention, the display panel is switched from the first gray scale picture to the preset picture, and after the preset picture is lightened for the first preset time, the camera device is utilized to acquire the brightness data of each pixel in the preset picture.
The preset picture comprises a first sub-picture and a second sub-picture, the variance values of the brightness data of the pixels of the pixel groups in the first sub-picture are respectively calculated, a third brightness variance value of the pixels of each pixel group in the first sub-picture is obtained when the display panel displays the preset picture, correspondingly, the variance values of the brightness data of the pixels of the pixel groups in the second sub-picture are respectively calculated, and a third brightness variance value of the pixels of each pixel group in the second sub-picture is obtained when the display panel displays the preset picture.
The gray scale value of the first sub-picture is the same as that of the second sub-picture, and the gray scale value of the second sub-picture is the same as that of the third sub-picture.
When the Gray scale value of the second Gray scale frame is Gray255 and the Gray scale value of the third Gray scale frame is Gray0, the Gray scale value of the first sub-frame is Gray255 and the Gray scale value of the second sub-frame is Gray0, so the predetermined frame can be a black-and-white checkerboard frame, such as the 7 × 5 black-and-white checkerboard frame shown in FIG. 2.
Therefore, the third luminance variance value of the pixel of the ith pixel group within the first sub-picture is:
wherein,
representing a third luminance variance value, x, of pixels in an ith pixel group within the first sub-pictureEijIndicating the brightness data of the jth pixel in the ith pixel group in the first sub-picture when displaying the preset picture,
a fifth average luminance value of pixels in the ith pixel group in the first sub-picture, and N represents the number of pixels in the ith pixel group.
Accordingly, the third luminance variance value of the pixel of the ith pixel group in the second sub-picture is:
wherein,
representing a third luminance variance value, x, of pixels in an ith pixel group within the second sub-pictureFijIndicating the brightness data of the jth pixel in the ith pixel group in the second sub-picture when displaying the preset picture,
a fifth average luminance value of pixels in the ith pixel group in the second sub-picture, and N represents the number of pixels in the ith pixel group.
In the embodiment of the present invention, the abnormal pixel group is determined 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 value of the pixel group in the second sub-picture and the corresponding second luminance variance value.
Specifically, when the absolute value of the difference between the third luminance variance value and the first luminance variance value of the pixel group in the first sub-picture is greater than a third set threshold, it is determined that the pixel group in the first sub-picture is an abnormal pixel group; and when the absolute value of the difference value between the third brightness variance value and the second brightness variance value of the pixel group in the second sub-picture is greater than a fourth set threshold, determining that the pixel group in the second 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 first sub-picture and the corresponding first luminance variance value is greater than a third set threshold, that is, when the absolute value of the difference between the third luminance variance value and the corresponding first luminance variance value is greater than the third set threshold
Determining the ith pixel group in the first sub-picture as an abnormal pixel group; when the absolute value of the difference between the third luminance variance value and the corresponding second luminance variance value of the pixel group in the second sub-picture is larger than a fourth set threshold, that is, when the absolute value of the difference between the third luminance variance value and the corresponding second luminance variance value is larger than the fourth set threshold
The ith pixel group in the second picture is determined to be an abnormal pixel group.
Wherein, the third set threshold is L1, the fourth set threshold is L2, and the specific values of the third set threshold L1 and the fourth set threshold L2 can be obtained through a plurality of tests.
In the embodiment of the invention, the first average brightness value and the second average brightness value of the pixels in the abnormal pixel group are removed, so that the influence on the accuracy of the subsequent calculation result of the residual image type and/or the residual image grade due to the display of partial abnormal pixels in the display panel is avoided, and the accuracy of the judgment result is further improved.
The first and second average luminance values referred to in subsequent steps 308 to 311 are both the first and second average luminance values of the pixel group from which the abnormal pixel group is removed.
It should be noted that, if the abnormal pixel group is not detected in step 306, the first average luminance value and the second average luminance value of the abnormal pixel group do not need to be removed.
In an embodiment of the invention, the predetermined frame includes a first sub-frame located in the first pixel region and a second sub-frame located in the second pixel region, and a gray scale value of the first sub-frame is greater than a predetermined gray scale value and a gray scale value of the second sub-frame is less than the predetermined gray scale value.
For example, the preset Gray level value may be Gray127, the Gray level value of the first sprite may be Gray255, and the Gray level value of the second sprite may be Gray 0.
Calculating an average value of second average luminance values of the pixel groups in the first pixel region as:
wherein,
representing an average value of second average luminance values of the group of pixels within the first pixel area,
and a second average luminance value of pixels in the ith pixel group, wherein M is the number of pixel groups in the first pixel region from which the abnormal pixel groups are removed.
Calculating an average value of first average luminance values of the group of pixels within the first pixel region as:
wherein,
representing an average value of first average luminance values of a group of pixels within the first pixel area,
and M is the number of the pixel groups in the first pixel region after the abnormal pixel groups are removed.
When the difference between the average value of the second average luminance values and the average value of the first average luminance values of the pixel groups in the first pixel region is larger than a first set threshold, that is, when the difference is larger than the first set threshold
And determining the afterimage type of the display panel as a white afterimage.
The first set threshold value is K1, and the specific value of the first set threshold value K1 can be obtained through a plurality of tests.
In the embodiment of the present invention, the average value of the first average luminance values of the pixel groups in the second pixel region is calculated as:
wherein,
representing an average value of first average luminance values of the group of pixels within the second pixel area,
and V is the number of the pixel groups in the second pixel region after the abnormal pixel groups are removed.
Calculating an average of second average luminance values of the group of pixels within the second pixel region as:
wherein,
representing an average of second average luminance values of the group of pixels within the second pixel area,
and a second average luminance value of pixels in the ith pixel group is represented, and V is the number of pixel groups in the second pixel region from which the abnormal pixel groups are removed.
When the difference between the average value of the first average luminance values and the average value of the second average luminance values of the pixel groups in the second pixel region is larger than a second set threshold, that is, when the difference is larger than the second set threshold
And determining the afterimage type of the display panel as black afterimage.
The second set threshold value is K2, and the specific value of the second set threshold value K2 can be obtained through a plurality of tests.
It should be noted that, when the display panel satisfies the conditions of step 308 and step 309, it is determined that the display panel is both a white afterimage and a black afterimage.
In the embodiment of the invention, the average value of the square of the difference value between the first average brightness value and the second average brightness value of each pixel group after the abnormal pixel group is removed is calculated to obtain the afterimage coefficient.
Thus, the afterimage coefficients are:
wherein P represents the afterimage coefficient, M + V represents the number of pixel groups in the display panel after removing the abnormal pixel group, and XAiRepresenting a first average luminance value of pixels within the ith pixel group,
representing a second average luminance value of pixels within the ith pixel group.
And 311, determining the afterimage grade of the display panel according to the corresponding relation between the afterimage coefficient and the preset afterimage grade.
In the embodiment of the invention, the afterimage grade of the display panel is determined according to the corresponding relation between the afterimage coefficient P and the preset afterimage grade.
For example, the preset afterimage level correspondence relationship is: when the afterimage coefficient P is less than or equal to P1When the image retention level is Q1, when the image retention coefficient is P1＜P＜P2When the image retention level is Q2, when the image retention coefficient P is more than or equal to P2When, the afterimage level is Q3; after the residual image coefficient P is obtained through calculation, if the residual image coefficient P is determined to meet the requirement of P according to the preset residual image grade corresponding relation1＜P＜P2Then the afterimage level is determined to be Q2.
Wherein, P1And P2The specific numerical values of (2) can be obtained through a plurality of tests.
In the embodiment of the invention, the residual image state of the display panel is automatically calculated by the first average brightness value of the pixels in each pixel group when the first gray scale picture is displayed, the first gray scale picture is switched to the preset picture, and the second average brightness value of the pixels in each pixel group after the preset picture is switched to the first gray scale picture again, so that the difference of the calculated residual image type and/or residual image grade caused by the subjective consciousness of people is avoided, and the accuracy and the judgment efficiency of the judgment result are improved; and determining an abnormal pixel group of the display panel according to the first brightness variance value of the pixels in each pixel group when the display panel displays the second gray scale picture, the second brightness variance value of the pixels in each pixel group when the display panel displays the third gray scale picture and the third brightness variance value of the pixels in each pixel group when the display panel displays the preset picture, and removing the first average brightness value and the second average brightness value of the abnormal pixel group to further improve the accuracy of the calculation result of the afterimage type and/or the afterimage grade.
EXAMPLE III
Referring to fig. 4, a block diagram of an afterimage determination apparatus 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:
a first average luminance value obtaining module 401 configured to obtain a first average luminance value of pixels in each pixel group when the display panel displays the first grayscale picture; the display panel includes a plurality of pixel groups;
a second average luminance value obtaining module 402, configured to switch the display panel from the first grayscale frame to a preset frame and maintain a first preset duration, and obtain a second average luminance value of the pixels in each pixel group after the preset frame is switched to the first grayscale frame again and maintains a second preset duration;
an afterimage state determination module 403 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 status includes an afterimage type and/or an afterimage level.
Referring to fig. 5, a block diagram of another display panel afterimage determination apparatus according to an embodiment of the present invention is shown.
On the basis of fig. 4, preferably, the preset frame includes a first sub-frame located in the first pixel region and a second sub-frame located in the second pixel region, and a gray level of the first sub-frame is greater than a preset gray level, and a gray level of the second sub-frame is less than the preset gray level; the afterimage state determination module 403 includes:
an afterimage type first determination submodule 4031 configured to determine the afterimage type of the display panel as a white afterimage when a difference between the average value of the second average luminance values and the average value of the first average luminance values of the pixel group within the first pixel region is greater than a first set threshold;
an afterimage type second determination sub-module 4032 configured to determine the afterimage type of the display panel as a black afterimage when a difference between the average value of the first average luminance values and the average value of the second average luminance values of the pixel group within the second pixel region is greater than a second set threshold.
Preferably, the afterimage state determining module 403 includes:
an afterimage coefficient calculation sub-module 4033 configured to calculate an average value of a square of a difference between the first average luminance value and the second average luminance value of each pixel group, so as to obtain an afterimage coefficient;
an afterimage grade determining sub-module 4034 configured to determine an afterimage grade of the display panel according to the correspondence between the afterimage coefficient and a preset afterimage grade.
Preferably, the afterimage determination device 400 for a display panel further includes:
a first luminance variance value obtaining module 404 configured to obtain a first luminance variance value of pixels in each pixel group when the display panel displays a second gray scale picture;
a second luminance variance value obtaining module 405, configured to obtain a second luminance variance value of the pixels in each pixel group when the display panel displays a third grayscale picture;
a third luminance variance value obtaining module 406, 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 comprises a first sub-picture and a second sub-picture, the gray scale value of the first sub-picture is the same as that of the second gray scale picture, and the gray scale value of the second sub-picture is the same as that of the third gray scale picture;
an abnormal pixel group determining module 407 configured to determine an abnormal pixel group according to a third luminance variance value of a pixel group within the first sub-picture and the first luminance variance value, and/or a third luminance variance value of a pixel group within the second sub-picture and the second luminance variance value;
a luminance value removal module 408 configured to remove the first and second average luminance values of the outlier pixel group.
Preferably, the abnormal pixel group determining module 407 includes:
an abnormal pixel group first determination sub-module 4071 configured to determine a pixel group within the first sub-picture as an abnormal pixel group when an absolute value of a difference between a third luminance variance value of the pixel group within the first sub-picture and the first luminance variance value is greater than a third set threshold;
an abnormal pixel group second determining sub-module 4072 configured to determine the pixel group within the second sub-picture as an abnormal pixel group when an absolute value of a difference between a third luminance variance value and the second luminance variance value of the pixel group within the second sub-picture is greater than a fourth set threshold.
In the embodiment of the present invention, when the display panel displays the first gray scale image, the first average luminance value of the pixels in each pixel group is obtained, the display panel is switched from the first gray scale image to the preset image and is maintained for the first preset time, and after the preset image is switched to the first gray scale image again and is maintained for the second preset time, the second average luminance value of the pixels in each pixel group is obtained, and the residual image state of the display panel is determined according to the first average luminance value and the second average luminance value, where the residual image state includes a residual image type and/or a residual image level. The residual image state of the display panel is automatically calculated by displaying the first average brightness value of the pixels in each pixel group when the first gray scale picture is displayed, switching the first gray scale picture to the preset picture, and switching the preset picture to the second average brightness value of the pixels in each pixel group after the first gray scale picture is switched again, so that the residual image type and/or the residual image grade obtained by calculation are ensured not to be different due to subjective consciousness of people, and the accuracy and the judgment efficiency of the judgment result are improved.
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The method and the device for determining the afterimage of the display panel provided by the invention are described in detail, and the principle and the implementation mode of the invention are explained by applying specific examples in the text, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A method for determining an afterimage of a display panel, comprising:
acquiring a first average brightness value of pixels in each pixel group when a display panel displays a first gray scale picture; the display panel includes a plurality of pixel groups;
switching the display panel from the first gray scale picture to a preset picture and maintaining a first preset time length, and obtaining a second average brightness value of the pixels in each pixel group after switching the preset picture to the first gray scale picture again and maintaining a second preset time length;
acquiring a first brightness variance value of pixels in each pixel group when the display panel displays a second gray scale picture;
acquiring a second brightness variance value of the pixels in each pixel group when the display panel displays a third gray scale picture;
acquiring a third brightness variance value of the pixels in each pixel group when the display panel displays the preset picture; the preset picture comprises a first sub-picture and a second sub-picture, the gray scale value of the first sub-picture is the same as that of the second gray scale picture, and the gray scale value of the second sub-picture is the same as that of the third gray scale picture;
determining an abnormal pixel group according to a third brightness variance value of the pixel group in the first sub-picture and the first brightness variance value, and/or a third brightness variance value of the pixel group in the second sub-picture and the second brightness variance value;
removing the first average brightness value and the second average brightness value of the abnormal pixel group;
determining the afterimage state of the display panel according to the first average brightness value and the second average brightness value; the afterimage status includes an afterimage type and/or an afterimage level.
2. The method of claim 1, wherein the predetermined frame comprises a first sub-frame in a first pixel region and a second sub-frame in a second pixel region, and the gray level of the first sub-frame is greater than a predetermined gray level and the gray level of the second sub-frame is less than the predetermined gray level; 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:
when the difference value between the average value of the second average brightness values and the average value of the first average brightness values of the pixel groups in the first pixel region is larger than a first set threshold value, determining that the afterimage type of the display panel is a white afterimage;
and when the difference value between the average value of the first average brightness values and the average value of the second average brightness values of the pixel groups in the second pixel region is larger than a second set threshold value, determining that the afterimage type of the display panel is 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 brightness value and the second average brightness value comprises:
calculating the square of the difference value between the first average brightness value and the second average brightness value of each pixel group, and calculating the average value to obtain a residual image coefficient;
and determining the afterimage grade of the display panel according to the corresponding relation between the afterimage coefficient and the preset afterimage grade.
4. The method according to claim 1, wherein the step of determining an abnormal pixel group 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 value of the pixel group in the second sub-picture and the second luminance variance value comprises:
when the absolute value of the difference value between the third brightness variance value of the pixel group in the first sub-picture and the first brightness variance value is larger than a third set threshold, determining the pixel group in the first sub-picture as an abnormal pixel group;
and when the absolute value of the difference value between the third brightness variance value and the second brightness variance value of the pixel group in the second sub-picture is greater than a fourth set threshold, determining that the pixel group in the second sub-picture is an abnormal pixel group.
5. An afterimage determination device for a display panel, comprising:
the first average brightness value acquisition module is configured to acquire a first average brightness value of pixels in each pixel group when the display panel displays a first gray-scale picture; 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 gray scale picture to a preset picture and maintain a first preset time length, and acquire a second average brightness value of the pixels in each pixel group after the preset picture is switched to the first gray scale picture again and maintains a second preset time length;
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 comprises an afterimage type and/or an afterimage grade;
a first luminance variance value obtaining module configured to obtain a first luminance variance value of pixels in each pixel group when the display panel displays a second gray scale picture;
a second brightness variance value obtaining module configured to obtain a second brightness variance value of the pixels in each pixel group when the display panel displays a third grayscale picture;
a third luminance variance value obtaining module configured to obtain a third luminance variance value of pixels in each pixel group when the display panel displays the preset picture; the preset picture comprises a first sub-picture and a second sub-picture, the gray scale value of the first sub-picture is the same as that of the second gray scale picture, and the gray scale value of the second sub-picture is the same as that of the third gray scale picture;
an abnormal pixel group determination module configured to determine an abnormal pixel group according to a third luminance variance value of a pixel group within the first sub-picture and the first luminance variance value, and/or a third luminance variance value of a pixel group within the second sub-picture and the second luminance variance value;
a luminance value removal module configured to remove the first and second average luminance values of the abnormal pixel group.
6. The apparatus of claim 5, wherein the predetermined frame comprises a first sub-frame in a first pixel region and a second sub-frame in a second pixel region, and a gray level of the first sub-frame is greater than a predetermined gray level and a gray level of the second sub-frame is less than the predetermined gray level; the afterimage state determination module comprises:
an afterimage type first determination sub-module configured to determine that an afterimage type of the display panel is a white afterimage when a difference between an average value of second average luminance values and an average value of first average luminance values of a pixel group within the first pixel region is greater than a first set threshold;
an afterimage type second determination sub-module configured to determine that the afterimage type of the display panel is a black afterimage when a difference between an average value of the first average luminance values and an average value of the second average luminance values of the pixel group within the second pixel region is greater than a second set threshold.
7. The apparatus of claim 5, wherein the image sticking status determining module comprises:
the residual image coefficient calculation submodule is configured to calculate an average value of the square of the difference value between the first average brightness value and the second average brightness value of each pixel group to obtain a residual image coefficient;
and the afterimage grade determining submodule is configured to determine the afterimage grade of the display panel according to the corresponding relation between the afterimage coefficient and the preset afterimage grade.
8. The apparatus of claim 5, wherein the abnormal pixel group determining module comprises:
an abnormal pixel group first determination sub-module configured to determine a pixel group within the first sub-picture as an abnormal pixel group when an absolute value of a difference between a third luminance variance value of the pixel group within the first sub-picture and the first luminance variance value is greater than a third set threshold;
an abnormal pixel group second determination sub-module configured to determine the pixel group within the second sub-picture as an abnormal pixel group when an absolute value of a difference between a third luminance variance value and the second luminance variance value of the pixel group within the second sub-picture is greater than a fourth set threshold.
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| CN111397856B (en) * | 2020-03-30 | 2022-03-29 | 昆山国显光电有限公司 | Residual image testing method and residual image testing device for display panel |
| CN111341233B (en) | 2020-04-09 | 2022-03-22 | 昆山国显光电有限公司 | Display panel ghost detection method and detection device |
| CN111855149B (en) * | 2020-06-24 | 2022-06-17 | 合肥维信诺科技有限公司 | Display panel ghost shadow testing method and device and computer equipment |
| CN113176677A (en) * | 2020-07-28 | 2021-07-27 | 深圳同兴达科技股份有限公司 | Method for testing screen ghost |
| CN114323594B (en) * | 2022-01-04 | 2024-09-24 | 合肥维信诺科技有限公司 | Testing method, processing equipment and testing device of display device |
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