CN112161782B - Display panel uniformity judgment method and display panel testing device - Google Patents
Display panel uniformity judgment method and display panel testing device Download PDFInfo
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Abstract
The invention discloses a method and a device for judging display brightness of a display screen, which are used for acquiring actual brightness corresponding to a test area on a display panel; acquiring actual brightness of a plurality of acquisition points in a preset area on the display panel, wherein the acquisition points are positioned around the test area; establishing a fitted brightness change curve according to the actual brightness of the acquisition point, wherein the fitted brightness change curve corresponds to the fitted brightness of the preset area and the fitted brightness of the test area; obtaining fitting brightness corresponding to the test area according to the fitting brightness curve, and obtaining a brightness difference value between the actual brightness of the test area and the fitting brightness corresponding to the test area; and determining the uniformity grade of the display panel according to the brightness difference value.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a method for determining uniformity of a display panel and a display panel testing apparatus.
Background
Organic Light Emitting Diode (OLED) display panels are widely used in various consumer electronic products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, desktop computers, and the like, and become the mainstream of display panels, because they have the advantages of high image quality, power saving, thin body, and wide application range.
When the display panel displays, the local brightness of the display panel is uneven. Therefore, it is required to test the brightness unevenness level of a local area of the display panel in order to evaluate and improve the quality of the display panel.
Disclosure of Invention
The invention aims to provide an objective, reliable and efficient display panel uniformity judgment method and a display panel testing device, which are mainly used for judging whether the actual display brightness of a display screen testing area is abnormal or not.
In order to achieve one of the above objectives, one embodiment of the present invention provides a method for determining uniformity of a display panel, including:
acquiring actual brightness corresponding to a test area on the display panel;
acquiring actual brightness of a plurality of acquisition points in a preset area on the display panel, wherein the acquisition points are positioned around the test area;
establishing a fitted brightness change curve according to the actual brightness of the acquisition point, wherein the fitted brightness change curve corresponds to the fitted brightness of the preset area and the fitted brightness of the test area;
obtaining fitting brightness corresponding to the test area according to the fitting brightness curve, and obtaining a brightness difference value between the actual brightness of the test area and the fitting brightness corresponding to the test area;
and determining the uniformity grade of the display panel according to the brightness difference value.
As an optional technical solution, the step of obtaining the actual brightness corresponding to the test area on the display panel includes: obtaining the number of the test areas actual brightness of each test point.
As an optional technical solution, the step of obtaining actual brightness of a plurality of collection points in a preset area on the display panel includes:
the plurality of collecting points are distributed on two sides of the plurality of testing points, and the plurality of testing points and the plurality of collecting points are positioned on the same straight line.
As an optional technical solution, the step of establishing a fitted brightness change curve according to the actual brightness of the acquisition point includes: and establishing a fitted brightness change curve of the display panel area corresponding to the straight line where the acquisition point is located according to the actual brightness of the acquisition point, wherein the fitted brightness change curve corresponds to the fitted brightness of the acquisition point and the fitted brightness of the test point.
As an optional technical solution, the step of obtaining the fitted brightness corresponding to the test region according to the fitted brightness variation curve, and obtaining the brightness difference value between the actual brightness of the test region and the fitted brightness corresponding to the test region includes:
and calculating to obtain the brightness difference value between the actual brightness of each test point and the fitting brightness corresponding to each test point according to the actual brightness of the test points and the fitting brightness corresponding to the test points, and taking the maximum value of the brightness difference values as the brightness difference value between the test area and the fitting brightness corresponding to the test area.
As an optional technical solution, the calculation formula of the brightness difference value is as follows:
wherein, deltaY is the brightness difference value, Y Practice of For the actual brightness, Y, of each of said test points Fitting And fitting brightness corresponding to each test point.
As an optional technical solution, the fitting degree of the fitted brightness change curve is greater than or equal to 0.8. As an optional technical solution, the step of determining the uniformity level of the display panel according to the brightness difference value includes:
establishing a uniformity evaluation model, wherein the uniformity evaluation model comprises a plurality of brightness difference grades and brightness difference reference value ranges corresponding to the brightness difference grades one by one;
and obtaining the brightness difference grade of the display panel according to the brightness difference reference value range in which the brightness difference value is positioned.
As an optional technical solution, the test area is a display area corresponding to fingerprint recognition imaging.
The present invention also provides a test apparatus for a display panel, the test apparatus comprising: the image acquisition device is used for acquiring actual images of a test area and the preset area on the display panel; the image analysis module is electrically connected with the image acquisition device and used for acquiring the actual brightness of the test area in the actual image and the actual brightness of a plurality of acquisition points of the preset area, and the plurality of acquisition points are positioned around the test area; and the brightness analysis module is electrically connected with the image analysis module and used for establishing a fitted brightness change curve according to the actual brightness of the plurality of acquisition points, the fitted brightness change curve corresponds to the fitted brightness of the preset area and the test area, the fitted brightness corresponding to the test area is obtained according to the fitted brightness curve, a brightness difference value between the actual brightness of the test area and the fitted brightness corresponding to the test area is obtained, and the uniformity grade of the display panel is determined according to the brightness difference value.
Compared with the prior art, the invention provides a display panel uniformity judgment method and a display panel testing device. Based on the above, the invention provides a method which is objective and quantifiable and can uniformly judge whether the display brightness in the test area is abnormal or not, and solves the problems of missed judgment and low judgment accuracy in the prior art through human eye identification.
Drawings
Fig. 1 is a schematic diagram of a display panel according to an embodiment of the invention.
Fig. 2 is a schematic side view of the display panel of fig. 1.
Fig. 3 is a flowchart of a method for determining brightness abnormality in the identification area of the display screen according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of an actual luminance variation curve according to an embodiment of the invention.
FIG. 5 is a diagram illustrating a fitted luminance variation curve according to an embodiment of the present invention.
Fig. 6 is a diagram illustrating a comparison between a fitted luminance variation curve and an actual luminance variation curve according to an embodiment of the present invention.
FIG. 7 is a graphical representation of luminance difference versus acquisition point for an embodiment of the present invention.
FIG. 8 is a functional block diagram of a testing apparatus according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
The invention aims to provide a method and a device for judging the uniformity of a display panel, wherein the testing device executes the steps in the method for judging the uniformity of the display panel, analyzes the actual brightness of a testing area of the display panel and judges whether the actual brightness of the testing area is abnormal or not, so that a judging method with a uniform and standardized evaluation mode is obtained, the actual brightness of the testing area of the display panel can be more clearly and objectively evaluated whether the actual brightness is abnormal or not, and the problems of missing judgment and low judgment accuracy rate caused by judging by adopting human eyes at present are solved.
As shown in fig. 1 and 3, the present invention provides a method for determining uniformity of a display panel, comprising:
acquiring actual brightness corresponding to a test area 1002 on the display panel 1000;
acquiring actual brightness of a plurality of acquisition points in a preset area 1001 of the display panel 1000, wherein the acquisition points are located around a test area 1002;
establishing a fitted brightness change curve according to the actual brightness of the plurality of acquisition points, wherein the fitted brightness change curve corresponds to the fitted brightness of a preset area 1001 and the fitted brightness of a test area 1002;
obtaining fitted brightness corresponding to the test area 1002 according to the fitted brightness curve, and obtaining a brightness difference value delta Y of the test area 1002 according to the actual brightness of the test area 1002 and the fitted brightness corresponding to the test area 1002;
the uniformity level of the display panel 1000 is determined according to the brightness difference value Δ Y. In a preferred embodiment, the step of determining the uniformity level of the display panel 1000 according to the brightness difference value comprises:
establishing a uniformity evaluation model, wherein the uniformity evaluation model comprises a plurality of brightness difference grades and brightness difference reference value ranges corresponding to the brightness difference grades one by one;
the brightness difference level of the display panel 100 is obtained according to the brightness difference reference value range where the brightness difference value Δ Y is located.
Specifically, the method comprises the following steps:
in the uniformity evaluation model, the range of the luminance difference reference values corresponding to the plurality of luminance difference levels one to one includes, based on 1.5 times of the Just Noticeable Difference (JND): 5.5JND, 5.5JND-3.5JND, 3.5JND-1.5JND, or less than or equal to 1.5JND.
For example:
1) The brightness difference value delta Y is more than or equal to 5.5JND, the actual brightness abnormal degree of the test area 1002 is serious, namely, the uniformity degree of the display panel 1000 is low;
2) 5.5JND > the brightness difference value delta Y is more than or equal to 3.5JND, the actual brightness abnormal degree of the test area 1002 is medium, namely, the uniformity degree of the display panel 1000 is low;
3) 3.5JND > the brightness difference value delta Y > 1.5JND, the actual brightness abnormal degree of the test area 1002 is slight, namely, the uniformity degree of the display panel 1000 is slightly low;
4) The brightness difference value delta Y is less than or equal to 1.5JND, and the actual brightness of the test area 1002 is normal.
In this embodiment, the brightness difference Δ Y is the maximum brightness difference of the test area 1002.
In a preferred embodiment, the step of acquiring the actual brightness corresponding to the test area 1002 on the display panel 1000 comprises:
the actual brightness of a plurality of test points in the test area 1002 is obtained. By collecting the actual brightness of the test points in the test area 1002 and evaluating the uniformity degree of the display panel 1000 by using the brightness of the test points, on one hand, the step of uniformity evaluation can be simplified, the actual brightness collection of the whole area is not needed, on the other hand, the actual brightness of the test area can be better represented in the test point distribution and test area, and the error of uniformity evaluation of the display panel 1000 is small.
In a preferred embodiment, the step of acquiring the actual brightness of the plurality of sampling points in the preset area 1001 of the display panel 1000 includes:
the plurality of collecting points are distributed on two sides of the plurality of testing points, and the plurality of testing points and the plurality of collecting points are positioned on the same straight line. Further, a plurality of collection points are uniformly distributed in the preset area 1001, and a plurality of test points are uniformly distributed in the test area 1002.
In a preferred embodiment, the step of establishing a fitted luminance variation curve according to the actual luminance of the captured points comprises:
and fitting the actual brightness of the acquisition points on the two sides of the plurality of test points, establishing a fitted brightness change curve of the display panel area corresponding to the straight line where the acquisition points are located, and fitting the obtained fitted brightness change curve corresponding to the fitted brightness of the acquisition points and the fitted brightness of the test points. The fitted brightness variation curve is only fitted to the actual brightness of the area corresponding to the straight line S on the display panel 1000, the area corresponding to the straight line S may be a row of pixels, a column of pixels, or a group of pixels in any direction of the display panel, and it is only necessary to ensure that the variation trend of the brightness of the display area corresponding to the straight line S along the extension direction of the straight line S is fixed. The straight line S penetrates through the test area 1001 and the preset area 1001, the test points and the collection points which are located on two sides of the test points and are also located on two sides of the test area 1002 are all located on the straight line S, therefore, a fitting brightness change curve which is established through the collection points can correspond to the fitting brightness of the collection points and the fitting brightness of the test points, and the fitting is only carried out on the collection points which are located on one straight line, so that the fitting data volume can be reduced compared with the fitting of the brightness of the whole preset area, the fitting time is saved, and meanwhile, the fitting degree of the fitting curve can be ensured.
When the collection points and the test points are not on the same straight line, the collection points are uniformly distributed around the test area 1002, the actual brightness of the collection points is fitted to obtain a fitted brightness change curve of the preset area 1001, and different from the fitted brightness change curve corresponding to the straight line S, the fitted brightness change curve of the preset area is the fitted brightness of one plane, and can be represented by a three-dimensional coordinate, for example, the horizontal and vertical coordinates represent the positions of the collection points on the display panel, and the vertical coordinates represent the fitted brightness of the collection points. Likewise, the fitted luminance of the test region may be obtained by fitting a luminance curve.
In a preferred embodiment, the step of obtaining the fitted brightness corresponding to the test region 1002 according to the fitted brightness variation curve, and obtaining the brightness difference value of the test region 1002 according to the actual brightness of the test region 1002 and the fitted brightness corresponding to the test region 1002 includes:
calculating according to the actual brightness of the plurality of test points in the test area 1002 and the fitting brightness corresponding to the plurality of test points in the fitting brightness change curve to obtain brightness difference values between the actual brightness of each test point and the fitting brightness corresponding to each test point, which correspond to each other, to obtain a plurality of brightness difference values, and taking the maximum value of the plurality of brightness difference values as the brightness difference value between the test area and the fitting brightness corresponding to the test area.
The calculation formula of the brightness difference value is as follows:
wherein, deltaY is the brightness difference value, Y Practice of For the actual brightness, Y, of each test point Fitting The fitted brightness corresponding to each test point.
In a preferred embodiment, the fitting degree of the fitted brightness variation curve is greater than or equal to 0.97, which is helpful for accurately determining the uniformity of the display panel.
In a preferred embodiment, the test area 1002 is a display area corresponding to fingerprint recognition or camera shooting of the display panel 1000.
The following describes in detail the determination steps of the determination method for the uniformity of the display panel shown in fig. 3 according to the present invention, by taking an SR5000 in-plane brightness acquisition device and a display panel 1000 having a curved bezel that is symmetrically disposed as an example.
It should be noted that, when acquiring the actual brightness of the display area of the display screen, the SR5000 in-plane brightness acquisition device can only acquire the actual brightness data of a plurality of points in the display screen in the transverse direction, that is, the direction perpendicular to the curved surface frame. Specifically, in the preset area 1001 and the test area 1002 of the display panel 1000, a plurality of points are uniformly divided along the horizontal straight line S, wherein the number of the collection points located in the preset area 1001 is 80-240, and the number of the test points located in the test area 1002 is 60-120. Furthermore, the test points are uniformly distributed on the left side and the right side of the test points, so that the brightness change of the display area where the fitting brightness change curve can be more accurately fitted.
In this embodiment, the brightness of the display panel 1000 changes in a certain direction or in certain directions. For example, when the display panel 1000 is a display screen driven on one side, the actual luminance of the preset region 1001 is attenuated in a direction toward the opposite side along the driving side. The variation trend of the fitting brightness in the fitting brightness variation curve obtained in the method for judging the uniformity of the display panel is consistent with the attenuation trend of the actual brightness of the preset region 1001.
The method for judging the uniformity of the display panel 1000 comprises the following steps:
firstly, an SR5000 in-plane brightness acquisition device is used for acquiring the actual brightness of a plurality of acquisition points and test points which are uniformly distributed on a transverse straight line S, and the actual brightness of a test area 1002 and the actual brightness of a preset area 1001 are acquired simultaneously.
After obtaining the actual brightness of the plurality of test points in the test area 1002 and the actual brightness of the plurality of collection points in the preset area 1001, an actual brightness change curve is further established.
Specifically, the method comprises the following steps:
as shown in fig. 1 and 2, the preset area 1001 of the display panel 1000 includes a first arc area 1001a, a planar area 1001b and a second arc area 1001c connected in sequence, and the test area 1002 is located in the planar area 1001 b. Since the actual brightness of the first arc-shaped area 1001a and the second arc-shaped area 1001c is lower than the actual brightness of the planar area 10031b, in order to facilitate the validity of data statistics, the actual brightness of the plurality of acquisition points corresponding to the first arc-shaped area 1001a and the second arc-shaped area 1001c is usually removed, and then an actual brightness change curve is created.
In this embodiment, an example of obtaining the actual brightness of 360 points is described, where 240 collection points located in the preset area 1001 and 120 test points located in the test area 1002 are included, and the 360 points are numbered from serial number 1 to serial number 360 in sequence, the collection points defining serial numbers 1 to 30 are located in the first arc area 1001a, the collection points defining serial numbers 331 to 360 are located in the second arc area 1001c, and the collection points defining serial numbers 31 to 120 and 241 to 330 and the test points defining serial numbers 121 to 240 are located in the planar area 1001b, respectively.
As shown in fig. 4, the actual luminance corresponding to 300 points from the serial number 31 to the serial number 330 is selected as the ordinate (corresponding to the luminance in fig. 4), and the actual luminance change curve between 300 points and the corresponding actual luminance is plotted with the serial number 31 to the serial number 330 as the abscissa (corresponding to the horizontal position in fig. 4).
In other embodiments of the present invention, when the preset area includes only a planar area, the collecting area in the planar area is divided horizontally and uniformly to form 360 collecting points, and the actual brightness corresponding to each collecting point from the collecting serial number 1 to the collecting serial number 360 is collected. Wherein, the corresponding drawing process of the actual brightness change curve comprises the following steps: and drawing an actual brightness change curve by taking the actual brightness corresponding to each acquisition point from the serial number 1 to the serial number 360 as a vertical coordinate and taking the serial number 1 to the serial number 360 as a horizontal coordinate.
As can be seen from the actual luminance variation curve shown in fig. 4, the actual luminance of the test area 1002 forms a depression in the middle of the actual luminance variation curve, which indicates that the actual luminance of the test area 1002 is lower, and thus the display panel 1000 is displayed unevenly at the test area 1002.
Secondly, establishing a fitted brightness change curve according to a plurality of acquisition points in a preset area 1001 and corresponding actual brightness; the fitted brightness change curve corresponds to the fitted brightness of a plurality of acquisition points in the preset region 1001 and a plurality of test points in the test region 1002. Namely, the fitted brightness corresponding to a plurality of test points can be obtained from the fitted brightness change curve. Specifically, as shown in fig. 5, the actual brightness corresponding to each acquisition point from the serial number 81 to the serial number 120 and the actual brightness corresponding to each acquisition point from the serial number 241 to the serial number 280 are selected as fitting data, and a fitting brightness change curve is obtained through software fitting. The fitting brightness change curve corresponds to the fitting brightness of 200 points from the serial number 81 to the serial number 280, that is, the fitting brightness corresponding to 120 test points from the serial number 121 to the serial number 240 can be obtained from the fitting brightness change curve.
In this embodiment, in the process of screening the fitting data, since each of the test points from the serial number 121 to the serial number 240 in the test area 1002 and the actual brightness corresponding thereto are generally low, the actual brightness data corresponding to the test points does not participate in the fitting when the fitting brightness change curve is established, the degree of fitting between the fitting brightness change curve and the actual brightness can be improved, and in order to ensure that the fitting brightness curve can truly represent the brightness change of the display panel 1000, the degree of fitting between the fitting brightness curve and the actual brightness needs to be greater than or equal to 0.8.
In addition, the higher the fitting degree of the fitted brightness change curve is, the more accurate the brightness difference value calculated subsequently according to the fitted brightness and the actual brightness is, so that the more accurate the judgment whether the actual brightness of the test region 1002 is abnormal or not is.
In one embodiment, the fitted brightness change curve obtained has a degree of fitting of 0.97, and the fitted brightness of each acquisition point in the fitted brightness change curve conforms to the formula Y = ax b Where a =461.31929, b = -0.01827, y is the fitted brightness, and x is the serial number of each collection point from serial number 81 to serial number 280.
It should be noted that when different software is used to obtain different fitted brightness change curves for the actual brightness corresponding to each acquisition point from the serial number 81 to the serial number 120 and the actual brightness corresponding to each acquisition point from the serial number 241 to the serial number 280, when the fitted brightness change curves are different, the formulas corresponding to the fitting degree and the fitted brightness may change.
In addition, taking the display panel 1000 as a display screen with one-side driving as an example, the actual luminance of the preset region 1001 of the display panel 1000 is attenuated toward the other side along one side of the preset region 1001, wherein the variation trend of the fitted luminance variation curve in the fitted luminance variation curve shown in fig. 5 is consistent with the attenuation trend of the actual luminance of the preset region 1001.
Then, a brightness difference value between the fitting brightness and the actual brightness of each test point in the test area 1002 is calculated, wherein the calculation formula of the brightness difference value is as follows
Δ Y is a luminance difference value, Y Practice of For the actual brightness, Y, of each test point Fitting The fitted brightness corresponding to each test point.
Obtaining the fitting brightness corresponding to each test point from the serial number 121 to the serial number 240 in the test area 1002 through the established fitting brightness change curve, and further calculating the brightness difference between the fitting brightness of each test point from the serial number 121 to the serial number 240 and the actual brightness to obtain a group of brightness difference values; the maximum value of the set of brightness differences is used to determine the uniformity of the display panel 1000.
As shown in fig. 7, the step of determining the uniformity of the display panel 1000 further includes establishing a variation curve of the brightness difference values by using a group of brightness difference values as a vertical coordinate and serial numbers 121 to 240 as horizontal coordinates (horizontal positions).
The maximum brightness difference value in the test area 1002 where the test points from the serial number 121 to the serial number 240 are located can be read from the brightness difference value variation curve in fig. 7, so that the uniformity of the display panel 1000 can be judged more intuitively.
In this embodiment, the step of determining the uniformity of the display panel 1000 further includes establishing a uniformity evaluation model, where the luminance difference reference value range corresponding to the luminance difference levels in one-to-one correspondence in the uniformity evaluation model includes: 5.5JND, 5.5JND-3.5JND, 3.5JND-1.5JND, or less than or equal to 1.5JND.
Through the uniformity evaluation model, the maximum brightness difference value delta Y in 120 test points from the serial number 121 to the serial number 240 is compared with a plurality of brightness difference reference value ranges, and the uniformity of the display panel is qualitatively analyzed. For example:
1) The brightness difference value delta Y is more than or equal to 5.5JND, the actual brightness abnormal degree of the test area 1002 is serious, namely, the uniformity degree of the display panel 1000 is low;
2) 5.5JND > the brightness difference value delta Y is more than or equal to 3.5JND, the actual brightness abnormal degree of the test area 1002 is medium, namely, the uniformity degree of the display panel 1000 is low;
3) 3.5JND > the brightness difference value delta Y > 1.5JND, the actual brightness abnormal degree of the test area 1002 is slight, namely, the uniformity degree of the display panel 1000 is slightly low;
4) The brightness difference value delta Y is less than or equal to 1.5JND, and the actual brightness of the test area 1002 is normal.
As shown in fig. 8, the present invention further provides a testing apparatus 2000, wherein the testing apparatus 2000 is used for executing the steps of the method for determining the uniformity of the display panel, and the testing apparatus 2000 comprises:
an image acquisition device 2001 for acquiring actual images of the test region 1002 and the preset region 1001 on the display panel 1000;
the image analysis module 2002 is electrically connected with the image acquisition device 2001 and is used for acquiring the actual brightness of the test area 1002 in the actual image and the actual brightness of a plurality of acquisition points of the preset area 1001, wherein the plurality of acquisition points are located around the test area 1002;
and the brightness analysis module 2003 is electrically connected with the image analysis module 2002 and is used for establishing a fitted brightness change curve according to the actual brightness of the plurality of acquisition points, wherein the fitted brightness change curve corresponds to the fitted brightness of the preset region 1001 and the test region 1002, the fitted brightness corresponding to the test region 1002 is obtained according to the fitted brightness curve, a brightness difference value is obtained according to the actual brightness of the test region 1002 and the fitted brightness corresponding to the test region 1002, and the uniformity grade of the display panel is determined according to the brightness difference value.
The brightness difference value obtained through the actual brightness of the test area 1002 and the fitting brightness corresponding to the test area 1002 refers to a maximum brightness difference value among a plurality of brightness difference values corresponding to a plurality of test points in the test area 1002.
In this embodiment, the image capturing device 2001 is, for example, a camera.
In summary, the present invention provides a method for determining uniformity of a display panel and a display panel testing apparatus, which acquire actual brightness of a testing area and actual brightness of a plurality of acquisition points of a preset area, establish a fitted brightness variation curve for the actual brightness of the plurality of acquisition points through a fitting process, obtain fitted brightness corresponding to the testing area according to the fitted brightness variation curve, calculate a brightness difference value between the fitted brightness and the actual brightness of the testing area, and determine whether the actual brightness of the testing area is abnormal according to the brightness difference value. Based on this, the present invention provides a method for determining whether the display brightness in the test area is abnormal or not, the problems of missed judgment and low judgment accuracy in the prior art through human eye identification are solved.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for judging the uniformity of a display panel is characterized by comprising the following steps:
acquiring actual brightness corresponding to a test area on the display panel;
acquiring actual brightness of a plurality of acquisition points in a preset area on the display panel, wherein the acquisition points are positioned around the test area;
establishing a fitted brightness change curve according to the actual brightness of the acquisition point, wherein the fitted brightness change curve corresponds to the fitted brightness of the preset area and the fitted brightness of the test area;
obtaining fitting brightness corresponding to the test area according to the fitting brightness curve, and obtaining a brightness difference value between the actual brightness of the test area and the fitting brightness corresponding to the test area;
and determining the uniformity grade of the display panel according to the brightness difference value.
2. The method for judging the uniformity of a display panel according to claim 1, wherein the step of obtaining the actual brightness corresponding to the test area on the display panel comprises:
and acquiring the actual brightness of a plurality of test points in the test area.
3. The method for judging the uniformity of a display panel according to claim 2, wherein the step of obtaining the actual brightness of a plurality of collection points in a preset area on the display panel comprises:
the plurality of collecting points are distributed on two sides of the plurality of testing points, and the plurality of testing points and the plurality of collecting points are positioned on the same straight line.
4. The method for judging the uniformity of a display panel according to claim 3, wherein the step of establishing a fitted luminance variation curve according to the actual luminance of the collection points comprises:
and establishing a fitted brightness change curve of the display panel area corresponding to the straight line where the acquisition point is located according to the actual brightness of the acquisition point, wherein the fitted brightness change curve corresponds to the fitted brightness of the acquisition point and the fitted brightness of the test point.
5. The method according to claim 2, wherein the step of obtaining the fitted brightness corresponding to the test region according to the fitted brightness variation curve and obtaining the brightness difference value between the actual brightness of the test region and the fitted brightness corresponding to the test region comprises:
and calculating to obtain the brightness difference value between the actual brightness of each test point and the fitting brightness corresponding to each test point according to the actual brightness of the test points and the fitting brightness corresponding to the test points in the fitting brightness change curve, and taking the maximum value of the brightness difference values as the brightness difference value between the test area and the fitting brightness corresponding to the test area.
6. The method according to any one of claims 2 to 5, wherein the brightness difference is calculated as follows:
and the delta Y is the brightness difference value, the Y is the actual brightness of each test point actually, and the Y is fitted to the fitted brightness corresponding to each test point.
7. The method for determining uniformity of a display panel according to any one of claims 1 to 5, wherein a degree of fitting of the fitted luminance variation curve is greater than or equal to 0.8.
8. The method for judging the uniformity of a display panel according to claims 1-4, wherein the step of determining the uniformity level of the display panel according to the brightness difference value comprises:
establishing a uniformity evaluation model, wherein the uniformity evaluation model comprises a plurality of brightness difference grades and brightness difference reference value ranges corresponding to the brightness difference grades one by one;
and obtaining the brightness difference grade of the display panel according to the brightness difference reference value range in which the brightness difference value is positioned.
9. The method according to claim 1, wherein the test area is a display area corresponding to fingerprint recognition or image capture.
10. A test apparatus for a display panel, the test apparatus comprising:
the image acquisition device is used for acquiring actual images of a test area and a preset area on the display panel;
the image analysis module is electrically connected with the image acquisition device and is used for acquiring the actual brightness of the test area in the actual image and the actual brightness of a plurality of acquisition points of the preset area, and the plurality of acquisition points are positioned around the test area;
and the brightness analysis module is electrically connected with the image analysis module and used for establishing a fitted brightness change curve according to the actual brightness of the plurality of acquisition points, the fitted brightness change curve corresponds to the fitted brightness of the preset area and the test area, the fitted brightness corresponding to the test area is obtained according to the fitted brightness curve, a brightness difference value between the actual brightness of the test area and the fitted brightness corresponding to the test area is obtained, and the uniformity grade of the display panel is determined according to the brightness difference value.
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