CN116577074A - Method and device for measuring brightness uniformity of display panel - Google Patents
Method and device for measuring brightness uniformity of display panel Download PDFInfo
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
- G01J3/506—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors measuring the colour produced by screens, monitors, displays or CRTs
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Abstract
The application provides a method and a device for measuring brightness uniformity of a display panel, belonging to the technical field of optical detection, wherein the method comprises the following steps: respectively confirming an average brightness value and an average gray value corresponding to each point location area according to a plurality of brightness values and a plurality of gray values of each point location area on the display panel; performing data fitting on the average brightness value and the average gray value of each point location area to obtain a linear fitting relation between the average brightness value and the average gray value of each point location area; determining a real brightness value of each point location area according to the gray value of each point location area and the linear fitting relation; and determining the brightness uniformity of the display panel according to the real brightness value of each point location area. The application collects the gray value and the brightness value of each point location area, can obtain the corresponding linear fitting relation of each point location area, and then can realize the brightness uniformity measurement of the display panel by the gray value and the real brightness value of the point location area, and has simple method and higher precision.
Description
Technical Field
The application relates to the technical field of optical detection, in particular to a method and a device for measuring brightness uniformity of a display panel.
Background
The automatic optical detection (Automated Optical Inspection, AOI) system is widely applied in industry, can replace people to complete a series of work with high repeatability and certain risk, has the characteristics of high speed, high precision, good reliability, no contact, no damage, high cost performance, strong universality and the like, and improves the production efficiency of a production line. The detection accuracy of the display panel is particularly important in panel manufacturing, and the defect detection algorithm is used as the core of the panel defect detection system, and the detection effect directly determines the satisfaction of customers.
In recent years, with the continuous increase of panel detection requirements, the more the brightness measurement requirements of the OLED display panel are. In the display panel industry, the existing standard measuring instruments such as a brightness meter (instrument) and a CA410 are generally used for measuring the brightness uniformity of the panel in the production line, compared with the common industrial camera, the standard measuring instrument has higher cost, and in the occasion that the brightness measurement precision is not particularly high, the precision advantage of the standard measuring instrument is not fully utilized, so that the high-precision measurement of the brightness uniformity of the display panel is difficult to realize.
Disclosure of Invention
The application provides a method and a device for measuring brightness uniformity of a display panel, which are used for solving the defects that the standard measuring instrument in the prior art has higher cost and the precision advantage of the standard measuring instrument is not fully utilized in occasions where the brightness measuring precision is not particularly high.
In a first aspect, the present application provides a method for measuring brightness uniformity of a display panel, including: respectively confirming an average brightness value and an average gray value corresponding to each point location area according to a plurality of brightness values and a plurality of gray values of each point location area on the display panel; performing data fitting on the average brightness value and the average gray value of each point location area to obtain a linear fitting relation between the average brightness value and the average gray value of each point location area; determining a real brightness value of each point location area according to the gray value of each point location area and the linear fitting relation; and determining the brightness uniformity of the display panel according to the real brightness value of each point location area.
According to the measurement method of the brightness uniformity of the display panel, provided by the application, under the condition that each linear fitting relation is a direct proportion function relation, the conversion coefficient between the average gray value and the real brightness value of each point location area is determined; correspondingly, determining the true brightness value of each point location area according to the gray value of each point location area and the linear fitting relation comprises the following steps: and taking the product of the gray value of each point location area and the conversion coefficient as the real brightness value of each point location area.
According to the method for measuring the brightness uniformity of the display panel provided by the application, the brightness uniformity of the display panel is determined according to the real brightness value of each point location area, and the method comprises the following steps: determining a maximum real brightness value and a minimum real brightness value from the real brightness values of all the point location areas; and taking the ratio of the minimum real brightness value to the maximum real brightness value as the brightness uniformity of the display panel.
According to the method for measuring the brightness uniformity of the display panel, before respectively confirming the average brightness value and the average gray value corresponding to each point location area according to the brightness values and the gray values of each point location area on the display panel, the method comprises the following steps: acquiring an image of the display panel and a brightness value of each point location area on the display panel; the measurement error of the brightness value is smaller than a preset threshold value; and determining the gray value of each point location area on the display panel based on the image of the display panel.
According to the method for measuring the brightness uniformity of the display panel provided by the application, the point location area on the display panel is configured as follows: each dot location area corresponds to one display sub-area of the display panel, and all display sub-areas just constitute all display areas of the display panel.
According to the method for measuring the brightness uniformity of the display panel provided by the application, after the brightness uniformity of the display panel is determined according to the real brightness value of each point location area, the method further comprises the following steps: step 1: increasing the brightness of the display subarea corresponding to the point location area with the minimum real brightness value under the condition that the brightness uniformity is smaller than the preset threshold value; step 2: re-determining the brightness uniformity of the current display panel; step 3: and (3) iteratively executing the steps 1 to 2 until the redetermined brightness uniformity is greater than or equal to a preset threshold value.
According to the method for measuring brightness uniformity of a display panel provided by the application, the gray value of each point location area on the display panel is determined based on the image of the display panel, and the method comprises the following steps: acquiring a gray value of each image pixel in the point location area based on the image of the display panel; and calculating the average value of the gray values of all the image pixels to serve as the gray value of the point location area.
According to the method for measuring the brightness uniformity of the display panel, the images of the display panel are acquired by using an industrial camera, and the brightness value of each point location area is acquired by using a standard measuring instrument.
In a second aspect, the present application further provides a device for measuring brightness uniformity of a display panel, including:
the first processing module is used for respectively confirming the average brightness value and the average gray value corresponding to each point location area according to the brightness values and the gray values of each point location area on the display panel;
the second processing module is used for carrying out data fitting on the average brightness value and the average gray value of each point location area to obtain a linear fitting relation between the average brightness value and the average gray value of each point location area;
the third processing module is used for determining the real brightness value of each point location area according to the gray value of each point location area and the linear fitting relation;
and the fourth processing module is used for determining the brightness uniformity of the display panel according to the real brightness value of each point location area.
In a third aspect, the present application provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the steps of the method for measuring luminance uniformity of a display panel according to any one of the above when the program is executed.
In a fourth aspect, the present application also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of a method for measuring luminance uniformity of a display panel as described in any one of the above.
According to the method and the device for measuring the brightness uniformity of the display panel, provided by the application, the gray value and the brightness value of each point location area are respectively and correspondingly acquired through the industrial camera and the standard metering instrument, so that the linear fitting relation of each point location area can be obtained, and then the real brightness value of the point location area can be obtained through the gray value, so that the brightness uniformity of the display panel can be accurately calculated.
Furthermore, under the application scene of the display panel industry, the chromaticity measurement precision requirement of which is not particularly high, the real brightness value of the display panel can be measured by the common industrial camera, and compared with an expensive standard measuring instrument (such as a brightness meter), the application not only saves the cost, but also is more convenient to maintain.
Drawings
In order to more clearly illustrate the application or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a method for measuring brightness uniformity of a display panel according to the present application;
FIG. 2 is a flow chart of a method for determining gray scale values of a dot location area on a display panel according to the present application;
FIG. 3 is a schematic view illustrating the arrangement of dot location areas on a display panel according to the present application;
FIG. 4 is a diagram of statistics of measured data provided by the present application;
fig. 5 is a schematic structural diagram of a device for measuring brightness uniformity of a display panel according to the present application;
fig. 6 is a schematic structural diagram of an electronic device provided by the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that in the description of embodiments of the present application, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. The orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description and to simplify the description, and are not indicative or implying that the apparatus or elements in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The terms "first," "second," and the like in this specification are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more.
The following describes a method and an apparatus for measuring brightness uniformity of a display panel according to embodiments of the present application with reference to fig. 1 to 6.
Fig. 1 is a flow chart of a method for measuring brightness uniformity of a display panel according to the present application, as shown in fig. 1, including but not limited to the following steps:
step 101: and respectively confirming the average brightness value and the average gray value corresponding to each point location area according to the brightness values and the gray values of each point location area on the display panel.
The display panel may be an OLED display screen or other types of display panels.
It can be understood that the dot location areas in the application are preset on the display panel, and the positions and the number of the dot location areas can be adaptively set according to the actual test requirements of the display panel.
As an alternative arrangement mode of the dot location areas, each dot location area corresponds to one display subarea of the display panel, and all the display subareas just constitute all the display areas of the display panel.
Specifically, in the present application, the average luminance value of each dot region is an average value of a plurality of luminance values of each dot region, and the average gray value of each dot region is an average value of a plurality of gray values of each dot region.
Optionally, before confirming the average luminance value and the average gray value corresponding to each dot region according to the plurality of luminance values and the plurality of gray values of each dot region on the display panel, the present application further includes: acquiring an image of the display panel and a brightness value of each point location area on the display panel; the measurement error of the brightness value is smaller than a preset threshold value; and determining the gray value of each point location area on the display panel based on the image of the display panel.
Alternatively, the measurement error is set to the relative error and the preset threshold is set to 0.03. Of course, the preset threshold and the measurement error may be set according to actual measurement needs, for example, the measurement error is set to be an absolute error, and the corresponding preset threshold is set to be a specific brightness value, which is not described herein.
Alternatively, to meet the measurement needs of the luminance values, the present application may utilize standard metrology instrumentation to collect the luminance values for each spot region. And, the present application can capture an image of the display panel based on the industrial camera.
Optionally, the standard meter is a luminance meter or a color analyzer. For example, a color analyzer model CA-410. The industrial camera may be a general industrial camera commonly used in the field, for example, a 151M industrial camera.
Step 102: and carrying out data fitting on the average brightness value and the average gray value of each point location area, and obtaining a linear fitting relation between the average brightness value and the average gray value of each point location area.
It will be appreciated that step 102 of the present application determines a conversion relationship between the average luminance value and the average gray value of each dot region by a linear fitting relationship, so as to facilitate the subsequent determination of the true luminance value according to the conversion relationship.
Step 103: and determining the real brightness value of each point location area according to the gray value of each point location area and the linear fitting relation.
The gray value in this step 103 is also determined by the image of the display panel taken by a common industrial camera.
Based on the conversion relation determined in the above step 102, the present step 103 uses the conversion relation to obtain the corresponding real brightness value after knowing the gray value of any bit region.
Step 104: and determining the brightness uniformity of the display panel according to the real brightness value of each point location area.
After the real brightness value of each point location area is obtained, the brightness uniformity of the display panel can be evaluated according to the difference degree of the real brightness values of different point location areas, such as evaluation parameters of the variance of the real brightness values and the like. The specific evaluation parameters may be adaptively selected according to the needs of the skilled person, and are not particularly limited herein.
According to the measuring method for the brightness uniformity of the display panel, provided by the application, the gray value and the brightness value of each point location area are acquired correspondingly through the industrial camera and the standard measuring instrument, so that the linear fitting relation of each point location area can be obtained, and then the real brightness value of the point location area can be obtained through the gray value, so that the brightness uniformity of the display panel can be accurately calculated.
Furthermore, under the application scene of the display panel industry, the chromaticity measurement precision requirement of which is not particularly high, the real brightness value of the display panel can be measured by the common industrial camera, and compared with an expensive standard measuring instrument (such as a brightness meter), the application not only saves the cost, but also is more convenient to maintain.
Based on the foregoing embodiments, as an alternative embodiment, fig. 2 is a flowchart of a method for determining a gray value of a dot location area on a display panel according to the present application, where, as shown in fig. 2, determining the gray value of the dot location area on the display panel based on an image of the display panel acquired by an industrial camera includes:
step 201: acquiring an image of the display panel with an industrial camera;
step 202: acquiring a gray value of each image pixel in the point location area based on the image of the display panel;
step 203: and calculating the average value of the gray values of all the image pixels to serve as the gray value of the point location area.
Alternatively, the present application may also select a plurality of representative image pixels from a dot location area, and determine the gray value of the dot location area according to an average value of gray values of the plurality of representative image pixels.
Based on the content of the above embodiments, as an alternative embodiment, in the case that each linear fitting relationship is a direct proportion function relationship, determining a conversion coefficient between an average gray value and a true brightness value of each dot location region; correspondingly, determining the true brightness value of each point location area according to the gray value of each point location area and the linear fitting relation comprises the following steps: and taking the product of the gray value of each point location area and the conversion coefficient as the real brightness value of each point location area. The method comprises the following steps:
the proportional function relationship is as follows:
;
wherein, the liquid crystal display device comprises a liquid crystal display device,represent the firstiAverage luminance value of individual dot areas, +.>Represent the firstiAverage gray value of individual dot areas, +.>Represent the firstiA plurality of conversion coefficients;
correspondingly, determining the real brightness value of each point location area according to the gray value of each point location area and the linear fitting relation; the method comprises the following steps:
;
wherein, the liquid crystal display device comprises a liquid crystal display device,represent the firstiTrue luminance value of the individual dot location area, +.>Represent the firstiGray values of the individual dot areas.
Based on the foregoing embodiments, as an optional embodiment, the method for measuring luminance uniformity of a display panel according to the present application includes: determining a maximum real brightness value and a minimum real brightness value from the real brightness values of all the point location areas; and taking the ratio of the minimum real brightness value to the maximum real brightness value as the brightness uniformity of the display panel.
In order to more specifically describe the above technical solution, a description will be given below with reference to specific embodiments.
Fig. 3 is a schematic diagram of setting a dot location area on a display panel according to the present application, as shown in fig. 3, including 1 to 13 dot location areas altogether, based on these dot location areas, a specific flow provided by an embodiment of the present application is as follows:
(1) The brightness values of 13 point location areas are collected by a CA410 color analyzer, respectively1、/>2、…/>13；
(2) Taking images by using an industrial camera, and acquiring gray scale values of 13 point location areas respectively as follows1、/>2、…/>13；
(3) Repeating (1) and (2) three times, and then respectively obtaining the average brightness value measured three times in each areaAverage gray level->；
(4) Based on 13-point location areasAnd->Fitting the linear function relationship respectively>To obtain the conversion coefficient of each point location +.>；
(5) Gray values of 13 point areas obtained by industrial camerasConversion coefficient multiplied by the corresponding point location->The real brightness value +.>By the formula->And calculating to obtain the brightness uniformity of the screen body, namely brightness uniformity.
Fig. 4 is a schematic diagram of statistics of actual measurement data provided by the present application, as shown in fig. 4, a test environment is an itek 151M camera, an aperture 9.7 and a 90mm lens, and data of 3 times and 13 point location areas under the test environment are shown, and real brightness values of corresponding point location areas on an image are obtained through conversion coefficients.
According to specific data, the error of the brightness uniformity (brightness uniformity) of the display panel calculated by the measuring method provided by the application is not more than 0.5%, and the error of the brightness uniformity of the display panel calculated by directly using the gray value is more than 4.5%, so that the accuracy and the effectiveness of the method adopted by the application are proved.
Based on the foregoing embodiments, as an optional embodiment, the method for measuring luminance uniformity of a display panel according to the present application further includes, after determining luminance uniformity of the display panel according to a true luminance value of each dot location area:
step 1: and increasing the brightness of the display subarea corresponding to the point location area with the minimum real brightness value under the condition that the brightness uniformity is smaller than the preset threshold value.
The preset threshold may be set according to the minimum brightness uniformity requirement of the display panel, for example, set to 0.85. And under the condition that the brightness uniformity is smaller than a preset threshold value, increasing the brightness uniformity of the display panel by increasing the brightness of the display subarea corresponding to the point position area with the minimum real brightness value.
Step 2: re-determining the brightness uniformity of the current display panel;
by using the method in the above embodiment, the brightness uniformity of the display panel after the brightness of the corresponding display sub-region is adjusted is recalculated.
Step 3: and (3) iteratively executing the steps 1 to 2 until the redetermined brightness uniformity is greater than or equal to a preset threshold value.
Judging whether the brightness uniformity of the display panel is smaller than a preset threshold value or not:
under the condition that the brightness is smaller than a preset threshold value, continuously executing the step 1 and the step 2 to adjust the brightness of the display panel;
and stopping adjusting the brightness of the display panel under the condition that the brightness is larger than or equal to a preset threshold value, and taking the brightness uniformity of the display panel determined after the last adjustment as the final brightness uniformity of the display panel.
According to the method for measuring the brightness uniformity of the display panel, after the brightness uniformity of the display panel is obtained, the brightness of the display subarea corresponding to the point location area with the minimum real brightness value is adjusted based on the obtained brightness uniformity so as to adjust the brightness uniformity of the display panel, so that the uniformity adjustment of the display panel is realized, and the problem of poor brightness uniformity of the display panel is solved.
Fig. 5 is a schematic structural diagram of a device for measuring luminance uniformity of a display panel according to the present application, as shown in fig. 5, the device includes: a first processing module 501, a second processing module 502, a third processing module 503, and a fourth processing module 504.
The first processing module 501 is configured to respectively confirm an average luminance value and an average gray value corresponding to each dot location area according to a plurality of luminance values and a plurality of gray values of each dot location area on the display panel;
the second processing module 502 is configured to perform data fitting on the average luminance value and the average gray value of each point location area, and obtain a linear fitting relationship between the average luminance value and the average gray value of each point location area;
a third processing module 503, configured to determine a real brightness value of each point location area according to the gray value of each point location area and the linear fitting relationship;
a fourth processing module 504, configured to determine brightness uniformity of the display panel according to the real brightness value of each dot location area.
According to the measuring device for the brightness uniformity of the display panel, provided by the application, under the application scene of the display panel industry, the chromaticity measurement precision requirement is not particularly high, the real brightness of the display panel can be measured through the common industrial camera, so that the cost of a brightness meter (instrument) with relatively high cost is saved, and compared with the brightness meter (instrument), the common industrial camera has lower cost and is more convenient to maintain. Hardware cost can be reduced while basic brightness measurement requirements are satisfied.
It should be noted that, when the device for measuring luminance uniformity of a display panel provided by the embodiment of the present application is specifically operated, the method for measuring luminance uniformity of a display panel described in any one of the above embodiments may be executed, which is not described in detail in this embodiment.
Fig. 6 is a schematic structural diagram of an electronic device according to the present application, and as shown in fig. 6, the electronic device may include: processor 610, communication interface (communications interface) 620, memory 630, and communication bus 640, wherein processor 610, communication interface 620, and memory 630 communicate with each other via communication bus 640. The processor 610 may invoke logic instructions in the memory 630 to perform a method of measuring luminance uniformity of a display panel, the method comprising: respectively confirming an average brightness value and an average gray value corresponding to each point location area according to a plurality of brightness values and a plurality of gray values of each point location area on the display panel; performing data fitting on the average brightness value and the average gray value of each point location area to obtain a linear fitting relation between the average brightness value and the average gray value of each point location area; determining a real brightness value of each point location area according to the gray value of each point location area and the linear fitting relation; and determining the brightness uniformity of the display panel according to the real brightness value of each point location area.
Further, the logic instructions in the memory 630 may be implemented in the form of software functional units and stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present application also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, are capable of performing the method for measuring luminance uniformity of a display panel provided in the above embodiments, the method comprising: respectively confirming an average brightness value and an average gray value corresponding to each point location area according to a plurality of brightness values and a plurality of gray values of each point location area on the display panel; performing data fitting on the average brightness value and the average gray value of each point location area to obtain a linear fitting relation between the average brightness value and the average gray value of each point location area; determining a real brightness value of each point location area according to the gray value of each point location area and the linear fitting relation; and determining the brightness uniformity of the display panel according to the real brightness value of each point location area.
In still another aspect, the present application further provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the method for measuring luminance uniformity of a display panel provided in the above embodiments, the method comprising: respectively confirming an average brightness value and an average gray value corresponding to each point location area according to a plurality of brightness values and a plurality of gray values of each point location area on the display panel; performing data fitting on the average brightness value and the average gray value of each point location area to obtain a linear fitting relation between the average brightness value and the average gray value of each point location area; determining a real brightness value of each point location area according to the gray value of each point location area and the linear fitting relation; and determining the brightness uniformity of the display panel according to the real brightness value of each point location area.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present application without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A method for measuring brightness uniformity of a display panel, comprising:
respectively confirming an average brightness value and an average gray value corresponding to each point location area according to a plurality of brightness values and a plurality of gray values of each point location area on the display panel;
performing data fitting on the average brightness value and the average gray value of each point location area to obtain a linear fitting relation between the average brightness value and the average gray value of each point location area;
determining a real brightness value of each point location area according to the gray value of each point location area and the linear fitting relation;
and determining the brightness uniformity of the display panel according to the real brightness value of each point location area.
2. The method according to claim 1, wherein in the case where each linear fitting relationship is a direct proportional function relationship, a conversion coefficient between an average gray value and a true brightness value of each dot region is determined;
correspondingly, determining the true brightness value of each point location area according to the gray value of each point location area and the linear fitting relation comprises the following steps:
and taking the product of the gray value of each point location area and the conversion coefficient as the real brightness value of each point location area.
3. The method for measuring luminance uniformity of a display panel according to claim 1, wherein said determining luminance uniformity of said display panel based on true luminance values of each dot region comprises:
determining a maximum real brightness value and a minimum real brightness value from the real brightness values of all the point location areas;
and taking the ratio of the minimum real brightness value to the maximum real brightness value as the brightness uniformity of the display panel.
4. The method according to claim 1, wherein before confirming the average luminance value and the average gray value corresponding to each dot region on the display panel according to the plurality of luminance values and the plurality of gray values of each dot region, respectively, comprising:
acquiring an image of the display panel and a brightness value of each point location area on the display panel; the measurement error of the brightness value is smaller than a preset threshold value;
and determining the gray value of each point location area on the display panel based on the image of the display panel.
5. The method of claim 3, wherein the spot area on the display panel is configured to:
each dot location area corresponds to one display sub-area of the display panel, and all display sub-areas just constitute all display areas of the display panel.
6. The method according to claim 5, further comprising, after determining the luminance uniformity of the display panel according to the true luminance value of each dot region:
step 1: increasing the brightness of the display subarea corresponding to the point location area with the minimum real brightness value under the condition that the brightness uniformity is smaller than the preset threshold value;
step 2: re-determining the brightness uniformity of the current display panel;
step 3: and (3) iteratively executing the steps 1 to 2 until the redetermined brightness uniformity is greater than or equal to a preset threshold value.
7. The method of claim 4, wherein determining the gray scale value for each dot region on the display panel based on the image of the display panel comprises:
acquiring a gray value of each image pixel in the point location area based on the image of the display panel;
and calculating the average value of the gray values of all the image pixels to serve as the gray value of the point location area.
8. The method of claim 4, wherein the image of the display panel is obtained by using an industrial camera, and the luminance value of each dot location area is obtained by using a standard measuring instrument.
9. A device for measuring brightness uniformity of a display panel, comprising:
the first processing module is used for respectively confirming the average brightness value and the average gray value corresponding to each point location area according to the brightness values and the gray values of each point location area on the display panel;
the second processing module is used for carrying out data fitting on the average brightness value and the average gray value of each point location area to obtain a linear fitting relation between the average brightness value and the average gray value of each point location area;
the third processing module is used for determining the real brightness value of each point location area according to the gray value of each point location area and the linear fitting relation;
and the fourth processing module is used for determining the brightness uniformity of the display panel according to the real brightness value of each point location area.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method for measuring luminance uniformity of a display panel according to any one of claims 1 to 8 when the computer program is executed by the processor.
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