CN111508397B - Display panel detection method and display panel detection device - Google Patents
Display panel detection method and display panel detection device Download PDFInfo
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- CN111508397B CN111508397B CN202010328865.6A CN202010328865A CN111508397B CN 111508397 B CN111508397 B CN 111508397B CN 202010328865 A CN202010328865 A CN 202010328865A CN 111508397 B CN111508397 B CN 111508397B
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Abstract
The invention provides a detection method of a display panel, which comprises the following steps: extracting the brightness values of N color channels when the display panel to be detected displays the image, and calculating the ratio of the selected basic brightness values to obtain a basic brightness ratio; extracting brightness values of N color channels of a region to be detected in a display panel to be detected, calculating the ratio of the selected region brightness values to obtain a region brightness ratio, and calculating the difference between the brightness ratio and the region brightness ratio; and judging whether the difference value is within a preset threshold range, thereby judging whether the area to be detected is a color cast area. A detection device of the display panel is also provided. By adopting the detection method and the detection device of the display panel, the problem that the error detection or over-detection is easily caused by a simple algorithm of subtracting the brightness values of a plurality of color channels from each other when the color cast region is judged in the conventional detection method can be solved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a detection method and a detection device of a display panel.
Background
When the defect of the display panel is inspected, the image capturing effect of the display panel has chromatic aberration due to various interference factors of non-real defects, such as the Gamma difference of the display panel, the OTP difference of the modules, the white balance difference of the image capturing camera, and the like, so that the accuracy of the final detection result is affected.
Disclosure of Invention
In view of this, embodiments of the present invention are directed to providing a method for detecting a display panel, so as to solve the problem of abnormal detection results caused by interference factors of unreal defects in the display panel in the prior art.
An embodiment of the present invention provides a method for detecting a display panel, including:
extracting the brightness values of N color channels when the display panel to be detected displays an image, and respectively recording the brightness values as a first color basic brightness value, a second color basic brightness value of \8230 \ 8230;
selecting at least two basic brightness values from the basic brightness values of the first color and the second color, wherein the basic brightness values of the first color and the second color are 8230, calculating the ratio of the selected basic brightness values to respectively obtain the ratio of the first basic brightness, the ratio of the second basic brightness, 8230, the ratio of the nth basic brightness, and the ratio of the second basic brightness, the ratio of the first basic brightness, the second basic brightness, the ratio of the nth basic brightness, and the ratio of the second basic brightness, the ratio of the nth basic brightness, wherein the ratio of the first basic brightness, the ratio of the second basic brightness, the ratio of the nth basic brightness, the ratio of the second basic brightness, the ratio of the nth basic brightness, and the ratio of the second basic brightness;
extracting the brightness values of N color channels of each pixel point in a to-be-detected area in a to-be-detected display panel, and recording the brightness values as a first color area brightness value, a second color area brightness value \8230 \ 8230and an Nth color area brightness value;
selecting at least two region brightness values from a first color region brightness value and a second color region brightness value of each pixel point, \8230 \ 8230:n color region brightness value, calculating the ratio of the selected region brightness values to respectively obtain a first region brightness ratio and a second region brightness ratio of each pixel point, \8230 \\8230andn region brightness ratio;
calculating the difference between the first basic brightness ratio and the first area brightness ratio to obtain a first difference, calculating the difference between the second basic brightness ratio and the second area brightness ratio to obtain a second difference, \8230;
respectively judging whether a first difference value, a second difference value, \8230 \8230andan nth difference value are within a preset threshold range, and judging whether color cast badness exists at each pixel point position in the region to be detected; wherein N is greater than or equal to 2, and N is greater than or equal to 1.
In an embodiment of the present invention, the extracting of the luminance values of the N color channels when the display panel to be detected displays an image is recorded as a first color basic luminance value, a second color basic luminance value \8230 \ 8230, and the nth color basic luminance value includes:
the method comprises the steps of lighting a display panel to be detected to display a color picture, respectively obtaining brightness values of a first color channel and a second color channel of each pixel point, wherein the brightness values of the first color channel and the second color channel are (8230) \\ 8230and the Nth color channel are (N) th, calculating an average value of the brightness values of the color channels of all the pixel points to obtain a basic brightness value of the first color, a basic brightness value of the second color, 8230the basic brightness value of the second color, and the Nth basic brightness value of the color.
In an embodiment of the invention, the step of respectively judging whether the first difference value, the second difference value, the difference value of 8230, and the nth difference value are within a preset threshold range is carried out, so as to judge whether color cast badness exists at each pixel point position in the area to be detected, and the step of judging whether color cast badness exists at the pixel point position in the area to be detected when any difference value exceeds the preset threshold range is carried out.
In an embodiment of the present invention, the predetermined threshold range is-0.05 to-0.05.
In an embodiment of the present invention, it is determined whether the first difference, the second difference, the value of 8230, and the nth difference are within a preset threshold range, so as to determine whether a color cast defect exists at each pixel point position in the region to be detected, and then the method further includes: and (3) computing the first difference value, the second difference value of 823082308230and the nth difference value to obtain a processed difference value, then performing binarization operation on the processed difference value, and presenting a judgment result.
In one embodiment of the present invention, the operation process includes taking absolute value of the first difference, the second difference, the difference of 82308230, the nth difference, and performing a multiplier or a power operation on the absolute value.
In another aspect, an embodiment of the present invention further provides a device for detecting a display panel, including:
the first acquisition module is used for acquiring the basic brightness ratio of the display panel to be detected;
the second acquisition module is used for respectively acquiring the region brightness ratio of each pixel point in the region to be detected in the display panel to be detected;
the judging module is used for respectively comparing the basic brightness ratio acquired by the first acquiring module with the regional brightness ratio of each pixel point acquired by the second acquiring module, and judging whether the difference value of the basic brightness ratio and the regional brightness ratio is within a preset threshold range, so as to judge whether color cast is bad at the position of each pixel point in the region to be detected;
the basic brightness ratio is the ratio of the brightness values of at least two of the N color channels when the display panel to be detected displays the image, the area brightness ratio is the ratio of the brightness values of at least two of the N color channels of the pixel points in the area to be detected in the display panel to be detected, and N is larger than or equal to 2.
In an embodiment of the present invention, the first obtaining module includes:
the basic brightness value acquisition module is used for extracting the brightness values of N color channels when the display panel to be detected displays an image, and the brightness values are respectively recorded as a first color basic brightness value and a second color basic brightness value \8230 \8230andan Nth color basic brightness value;
the basic brightness value processing module is used for selecting at least two basic brightness values from the basic brightness values of the first color and the second color, namely \8230, and calculating the ratio of the selected basic brightness values to respectively obtain a first basic brightness ratio, a second basic brightness ratio \8230, a 8230and an nth basic brightness ratio; wherein n is greater than or equal to 1.
In an embodiment of the present invention, the second obtaining module includes:
the device comprises a region brightness value acquisition module, a region brightness value acquisition module and a region brightness value acquisition module, wherein the region brightness value acquisition module is used for extracting the brightness values of N color channels of each pixel point in a region to be detected in a display panel to be detected, and the brightness values are recorded as a first color region brightness value, a second color region brightness value of (8230) (\8230); an Nth color region brightness value;
the device comprises a pixel point processing module, a regional brightness value processing module and a color area display module, wherein the pixel point processing module is used for selecting at least two regional brightness values from a first color regional brightness value and a second color regional brightness value of each pixel point, and calculating the ratio of the selected regional brightness values to respectively obtain a first regional brightness ratio, a second regional brightness ratio, 8230, and an nth regional brightness ratio of each pixel point;
wherein n is greater than or equal to 1.
In an embodiment of the present invention, the apparatus further includes an operation processing module, where the operation processing module is configured to perform operation processing on the difference value and present a determination result.
The beneficial effects of the invention include: by adopting the detection method and the detection device of the display panel, the problem that the error detection or over-detection is easily caused by a simple algorithm of subtracting the brightness values of a plurality of color channels from each other when the color cast region is judged in the conventional detection method can be solved. The detection method and the detection device provided by the invention have few interference factors, can better present the defects in actual display, and effectively improve the accuracy of the detection result. The detection method and the detection device provided by the invention have the advantages of wide application range and simplicity in operation.
Drawings
Fig. 1 is a schematic step diagram of a method for detecting a display panel according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a step of extracting luminance values of N color channels when an image is displayed on a display panel to be detected according to an embodiment of the present invention.
Fig. 3 is a schematic view of a detection apparatus for a display panel according to an embodiment of the invention.
Fig. 4 is a schematic view of a detection apparatus for a display panel according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The inventor finds that interference factors of unreal defects can affect the accuracy of detection results when a display panel is detected, and particularly, when AOI detects that the panel is poor in color cast, particularly OLED color mixing, an algorithm of subtracting RGB three-channel brightness values two by two is used in a traditional mode, and a part with an out-of-limit difference value is extracted to be judged as the color cast. The color difference of the interference factors can also cause overlarge numerical value when the RGB channel difference is calculated, and the numerical value is not easy to distinguish from the real display defect, thereby causing false detection and over-detection. The inventors have made extensive studies to solve the above problems and have proposed the following solutions.
Fig. 1 is a schematic diagram of a detection method of a display panel according to an embodiment of the invention. As shown in fig. 1. An embodiment of the present invention provides a color cast detection method for a display panel, including:
s1, extracting brightness values of N color channels when a display panel to be detected displays an image, and respectively recording the brightness values as a first color basic brightness value, a second color basic brightness value \8230 \ 8230and an Nth color basic brightness value;
s2, selecting at least two basic brightness values from the basic brightness values of the first color and the second color, wherein the basic brightness values of the first color and the second color are 8230, calculating the ratio of the selected basic brightness values to respectively obtain a first basic brightness ratio and a second basic brightness ratio, wherein the ratio of the first basic brightness value to the second basic brightness value is 8230, and the ratio of the nth basic brightness value is 8230;
s3, extracting the brightness values of N color channels of each pixel point in the area to be detected in the display panel to be detected, and recording the brightness values as a first color area brightness value, a second color area brightness value of (8230) \ 8230, and an Nth color area brightness value;
s4, selecting at least two region brightness values from the first color region brightness value and the second color region brightness value of each pixel point, calculating the ratio of the selected region brightness values, and respectively obtaining the first region brightness ratio and the second region brightness ratio of each pixel point, wherein the first region brightness ratio and the second region brightness ratio are (8230); the nth region brightness ratio);
s5, respectively calculating a difference value between a first basic brightness ratio and a first area brightness ratio for each pixel point to obtain a first difference value, calculating a difference value between a second basic brightness ratio and a second area brightness ratio to obtain a second difference value, \ 8230 \ 8230, and calculating a difference value between an nth basic brightness ratio and an nth area brightness ratio to obtain an nth difference value;
s6, respectively judging whether a first difference value, a second difference value, i.e., \8230, and an nth difference value are within a preset threshold range, so as to judge whether color cast defects exist at the position of each pixel point in the region to be detected; wherein N is greater than or equal to 2, and N is greater than or equal to 1.
By the method, the problem that the existing detection method is easy to cause false detection or over-detection due to the influence of the self color difference of the display panel to be detected when the existing detection method only adopts a simple algorithm of subtracting the brightness values of the plurality of color channels from each other can be solved. The detection method provided by the invention has the advantages of less interference factors, capability of better presenting the defects in actual display, effective improvement of the accuracy of the detection result, wide application range and simple operation.
It is understood that the sequence of the above steps is not fixed, and the basic luminance value may be obtained first, or the region luminance value may be obtained first, or both, as long as the object of the present invention is achieved.
Specifically, when the color cast type defect detection is performed on the display panel to be detected, the luminance values of the N color channels when the display panel to be detected displays an image are extracted, and taking 3 color channels as an example, three color channels, such as R, G, and B, are respectively recorded as a first color basic luminance value LR0, a second color basic luminance value LG0, and a third color basic luminance value LB0. At least two basic brightness values are selected from the first color basic brightness value LR0, the second color basic brightness value LG0 and the third color basic brightness value LB0, and further, by taking the selection of 2 basic brightness values, for example, the selection of the first color basic brightness value LR0 and the second color basic brightness value LG0, the ratio of the selected basic brightness values is calculated to obtain a first basic brightness ratio LR0/LG0 and a second basic brightness ratio LG0/LR0, respectively. It can be understood that, when parameters such as the brightness value or the brightness value ratio of each pixel point in the region to be detected in the display panel to be detected are obtained, the parameters should be consistent with the color channel and the ratio type selected when the brightness value or the brightness value ratio of the whole display panel to be detected is obtained.
Further, the brightness values of 3 color channels (three color channels R, G, and B) of each pixel point in the region to be detected in the display panel to be detected are extracted and recorded as a first color region brightness value LR1, a second color region brightness value LG1, and a third color region brightness value LB1. Selecting 2 regional brightness values from the first color regional brightness value LR1, the second color regional brightness value LG1 and the third color regional brightness value LB1, namely the first color regional brightness value LR1 and the second color regional brightness value LG1, calculating the ratio of the selected regional brightness values, and respectively obtaining a first regional brightness ratio LR1/LG1 and a second regional brightness ratio LG1/LR1 of each pixel point. It can be understood that the manner of obtaining the region brightness value of each color channel of each pixel point in the region to be detected of the display panel to be detected is consistent with the manner of obtaining the brightness value of each color channel of the display panel to be detected.
And respectively calculating the difference between the first basic brightness ratio LR0/LG0 and the first regional brightness ratio LR1/LG1 for each pixel point to obtain a first difference, and calculating the difference between the second basic brightness ratio LG0/LR0 and the second regional brightness ratio LG1/LR1 to obtain a second difference.
And respectively judging whether the first difference value and the second difference value are within a preset threshold range, so as to judge whether color cast is bad at the position of each pixel point in the region to be detected.
In the embodiment of the present invention, the brightness value when the display image of the display panel to be detected is extracted is taken as an example of 3 color channels, and in other embodiments, 2 color channels, 4 color channels, or more color channels may also be selected. After the luminance values of the plurality of color channels are obtained, when the luminance ratios are obtained based on the luminance values of the plurality of color channels, a plurality of luminance ratios can be obtained, in this embodiment, 2 luminance ratios are selected as an example, and in other embodiments, 1 luminance ratio, 3 luminance ratios, or more luminance ratios can be selected.
In an embodiment of the present invention, as shown in fig. 2, in step S1, luminance values of N color channels when the display panel to be detected displays an image are extracted and are respectively recorded as a first color basic luminance value, a second color basic luminance value \8230 \ 8230, and the nth color basic luminance value includes: s11, lightening a display panel to be detected to display a color picture; s12, obtaining brightness values of a first color channel and a second color channel of each pixel point, wherein the brightness values of the first color channel and the second color channel are \ 8230, obtaining a basic brightness value of the first color, the basic brightness value of the second color, the 8230, the basic brightness value of the nth color channel, and calculating the average value of the brightness values of the color channels of all the pixel points.
Specifically, taking extracting the brightness values of 3 color channels (R channel, G channel, and B channel) as an example, the display panel to be detected is lighted up to display a color picture, the brightness value of the first color channel, the brightness value of the second color channel, and the brightness value of the third color channel of each pixel point are respectively obtained, the average value of the brightness values of the color channels of all the pixel points is calculated and recorded as a first color basic brightness value LR0, a second color basic brightness value LG0, and a third color basic brightness value LB0, respectively.
The mode for acquiring the basic brightness value of each color in the embodiment of the present invention may be selected in many ways, and is not limited to the above mode, as long as the brightness value of each color channel of the display panel to be detected can be acquired. As can be understood, the manner of obtaining the region brightness value of each color channel of each pixel point of the region to be detected of the display panel to be detected is consistent with the manner of obtaining the brightness value of each color channel of the display panel to be detected. And will not be described in detail herein.
In an embodiment of the present invention, step S6 is performed to respectively determine whether the first difference value, the second difference value \8230, and the nth difference value are within a preset threshold range, so as to determine whether a color cast defect exists at each pixel point position in the region to be detected, including determining that a color cast defect exists at a pixel point position in the region to be detected when any difference value exceeds the preset threshold range. Specifically, for one pixel point, taking the judgment of 2 difference values as an example, the first basic luminance ratio LR0/LG0 is 1.0625, the first regional luminance ratio LR1/LG1 is 1.125, and the difference value between the two is-0.0625, which is the first difference value C1. And if the C1 is within the preset threshold range and the C2 exceeds the preset threshold range, judging that the pixel point position has color cast badness. And when the C1 and the C2 are both within the preset threshold range, judging that the position of the pixel point is normal. And respectively carrying out the judgment process on each pixel point, thereby determining whether the position of each pixel point in the area to be detected has color cast badness. The description is omitted. It can be understood that when the luminance ratio is obtained based on the luminance values of the plurality of color channels, a plurality of luminance ratios can be obtained, and a plurality of difference values can also be obtained based on the plurality of luminance ratios, in this embodiment, 2 difference values are selected as an example, in other embodiments, 1 difference value can also be selected, 3 difference values or more difference values are selected for determining whether the difference values are within a preset threshold range, and the difference values can be flexibly selected according to different product color cast phenomena, which is not described herein again.
Further, the preset threshold range is-0.05. The inventor finds that by adopting the preset threshold range, whether color cast is bad at each pixel point position in the area to be detected can be effectively judged, the result is easy to present, and the false detection rate is low.
In an embodiment of the present invention, step S6 includes determining, respectively, whether a first difference value, a second difference value \8230, and an nth difference value are within a preset threshold range, thereby determining whether a color cast defect exists at each pixel point position in the region to be detected, and then further including: and (3) computing the first difference value, the second difference value of 823082308230and the nth difference value to obtain a processed difference value, then performing binarization operation on the processed difference value, and presenting a judgment result. Furthermore, the operation processing comprises the steps of taking absolute values of the first difference value, the second difference value of 82308230the nth difference value of 8230, and carrying out multiplier or power operation on the absolute values. Specifically, taking a pixel point, the first basic luminance ratio LR0/LG0 is 1.0625, the first regional luminance ratio LR1/LG1 is 1.125, and the difference between the two is-0.0625, that is, the first difference C1 as an example, the absolute value of the first difference is first obtained to obtain 0.0625, then the numerical value is subjected to multiplier calculation to obtain 62.5 (multiplied by 1000), then binarization processing is performed, and a result is presented, so that whether color cast defects exist at the detected pixel point position can be obviously presented from the image. In the invention, the difference result is operated so as to make the difference degree of the to-be-detected region obvious and better present the judgment result. It can be understood that other multiple difference values can be selected for one pixel point to be respectively subjected to operation processing, and each pixel point of the area to be detected can be processed according to the same difference value selection mode and operation mode, and a result is finally presented. Therefore, the phenomenon of color cast badness at the pixel point position of the region to be detected can be presented on the whole.
Based on the same inventive concept, another aspect of the embodiments of the present invention further provides a detection apparatus for a display panel. Fig. 3 is a schematic diagram of a detection apparatus for a display panel according to an embodiment of the present invention. As shown in fig. 4, the detecting device includes: the device comprises a first acquisition module 1, a second acquisition module 2 and a judgment module 3, wherein the first acquisition module 1 is used for acquiring the basic brightness ratio of the display panel to be detected; the second obtaining module 2 is configured to obtain a region brightness ratio of each pixel point in a region to be detected in the display panel to be detected; and the judging module 3 is configured to compare the basic brightness ratio acquired by the first acquiring module with the area brightness ratio acquired by the second acquiring module, and judge whether a difference between the basic brightness ratio and the area brightness ratio is within a preset threshold range, so as to judge whether color cast at each pixel point position in the area to be detected is poor. In this embodiment, the basic brightness ratio is a ratio of brightness values of at least two of the N color channels when the display panel to be detected displays an image, the area brightness ratio is a ratio of brightness values of at least two of the N color channels of the pixel point in the area to be detected in the display panel to be detected, and N is greater than or equal to 2. By adopting the detection device, the problem that false detection or over-detection is easily caused by a simple algorithm of subtracting the brightness values of a plurality of color channels from each other when the color cast region is judged in the conventional detection method can be solved. The detection device provided by the invention has few interference factors, can better present the defects in actual display, effectively improves the accuracy of the detection result, and has wide application range and simple operation.
In another embodiment of the present invention, as shown in fig. 4, the first obtaining module 1 includes: the device comprises a basic brightness value acquisition module 11 and a basic brightness value processing module 12, wherein the basic brightness value acquisition module 11 is used for extracting the brightness values of N color channels when a display panel to be detected displays an image, and the brightness values are respectively marked as a first color basic brightness value, a second color basic brightness value \8230 \ 8230and an Nth color basic brightness value. The basic brightness value processing module 12 is configured to select at least two basic brightness values from the first color basic brightness value and the second color basic brightness value \8230, calculate a ratio of the selected basic brightness values, and obtain a first basic brightness ratio, a second basic brightness ratio \8230, a 8230, and an nth basic brightness ratio, where N is greater than or equal to 1.
In another embodiment of the present invention, as shown in fig. 4, the second obtaining module 2 includes: the display panel detection device comprises an area brightness value acquisition module 21 and an area brightness value processing module 22, wherein the area brightness value acquisition module 21 is used for extracting brightness values of N color channels of an area to be detected in a display panel to be detected, and the brightness values are recorded as a first color area brightness value, a second color area brightness value \8230 \ 8230and an Nth color area brightness value. The region brightness value processing module 22 is configured to select at least two region brightness values from a first color region brightness value, a second color region brightness value \8230, and an nth color region brightness value of each pixel point, calculate a ratio of the selected region brightness values, and obtain a first region brightness ratio, a second region brightness ratio \8230, a 8230, and an nth region brightness ratio, where N is greater than or equal to 1, of each pixel point.
In an embodiment of the present invention, as shown in fig. 4, the present invention further includes an operation processing module 4, where the operation processing module 4 is configured to perform operation processing on the difference value and present a determination result. Further, the operation processing module 4 performs operation processing on the difference value to obtain a processed difference value, performs binarization operation on the processed difference value, and presents a judgment result. Further, the operation process includes taking the absolute value of the difference, and performing a multiplier or a power operation on the absolute value. The adoption of the operation processing module can make the differentiation degree more obvious, can better present the defect result in actual display, and effectively improves the accuracy of the detection result.
It should be understood that the terms "first" and "second" used in the description of the embodiments of the present invention are only used for clearly illustrating the technical solutions, and are not used for limiting the protection scope of the present invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.
Claims (10)
1. A method for detecting a display panel is characterized by comprising the following steps:
extracting the brightness values of N color channels when the display panel to be detected displays an image, and respectively recording the brightness values as a first color basic brightness value, a second color basic brightness value of \8230 \ 8230;
the method comprises the steps of selecting at least two basic brightness values from basic brightness values of a first color and a second color, calculating the ratio of the selected basic brightness values to obtain a first basic brightness ratio, a second basic brightness ratio, a value of 8230, a value of 823030, and a value of nth basic brightness;
extracting the brightness values of N color channels of each pixel point in a region to be detected in the display panel to be detected, and recording the brightness values as a first color region brightness value, a second color region brightness value \8230;, and an Nth color region brightness value;
selecting at least two region brightness values from the first color region brightness value and the second color region brightness value of each pixel point, and calculating the ratio of the selected region brightness values to respectively obtain the first region brightness ratio, the second region brightness ratio, the 8230, and the nth region brightness ratio of each pixel point;
calculating the difference between the first basic brightness ratio and the first area brightness ratio to obtain a first difference, calculating the difference between the second basic brightness ratio and the second area brightness ratio to obtain a second difference, \8230; the basic brightness ratio is consistent with the color corresponding to the brightness ratio in the region brightness ratio;
respectively judging whether a first difference value, a second difference value, \8230 \8230andan nth difference value are within a preset threshold range, and thus judging whether color cast badness exists at each pixel point position in the region to be detected; wherein N is greater than or equal to 2, and N is greater than or equal to 1.
2. The method for detecting the display panel according to claim 1, wherein the step of extracting the luminance values of the N color channels when the display panel to be detected displays the image is respectively marked as a first color basic luminance value, a second color basic luminance value \8230 \ 8230 \ 8230, and the nth color basic luminance value includes:
the display panel to be detected is lightened to display a color picture, the brightness value of a first color channel and the brightness value of a second color channel of each pixel point are obtained respectively, the brightness value of the second color channel is 8230, the brightness value of the Nth color channel is calculated, the average value of the brightness values of the color channels of all the pixel points is calculated, and the basic brightness value of the first color, the basic brightness value of the second color, the basic brightness value of the 8230, the basic brightness value of the 8230and the basic brightness value of the Nth color are obtained.
3. The method for detecting the display panel according to claim 1, wherein the first difference value, the second difference value, the difference value of 8230, and the difference value of nth are respectively determined to be within a preset threshold range, so as to determine whether the color cast defect exists at each pixel point position in the region to be detected, and the method comprises the step of determining that the color cast defect exists at the pixel point position in the region to be detected when any difference value exceeds the preset threshold range.
4. The method for inspecting display panel according to any of claims 1-3, wherein the predetermined threshold is in the range of-0.05 to 0.05.
5. The method for detecting a display panel according to claim 4, wherein the method further comprises the steps of respectively determining whether the first difference value, the second difference value of 8230, the value of 8230of the nth difference value are within a preset threshold range, thereby determining whether color cast defects exist at each pixel point position in the area to be detected, and then: the first difference value, the second difference value (8230) \8230, (the nth difference value) is calculated, and obtaining the processed difference value, performing binarization operation on the processed difference value, and presenting a judgment result.
6. The method as claimed in claim 5, wherein the operation comprises computing the absolute value of the first difference value, the second difference value, the absolute value of the nth difference value, and the second difference value, the absolute value of the second difference value, and the absolute value of the nth difference value.
7. An apparatus for inspecting a display panel, comprising:
the first acquisition module is used for acquiring the basic brightness ratio of the display panel to be detected;
the second acquisition module is used for respectively acquiring the region brightness ratio of each pixel point in the region to be detected in the display panel to be detected;
the judging module is used for respectively comparing the basic brightness ratio acquired by the first acquiring module with the regional brightness ratio of each pixel point acquired by the second acquiring module, and judging whether the difference value of the basic brightness ratio and the regional brightness ratio is within a preset threshold range, so as to judge whether color cast is bad at the position of each pixel point in the region to be detected; the basic brightness ratio is consistent with the color corresponding to the brightness ratio in the region brightness ratio;
the basic brightness ratio is the ratio of the brightness values of at least two of the N color channels when the display panel to be detected displays an image, the area brightness ratio is the ratio of the brightness values of at least two of the N color channels of the pixel points in the area to be detected in the display panel to be detected, and N is greater than or equal to 2.
8. The apparatus for detecting a display panel according to claim 7, wherein the first obtaining module comprises:
the basic brightness value acquisition module is used for extracting the brightness values of N color channels when the display panel to be detected displays an image, and the brightness values are respectively recorded as a first color basic brightness value and a second color basic brightness value \8230 \8230andan Nth color basic brightness value;
the basic brightness value processing module is used for selecting at least two basic brightness values from the first color basic brightness value and the second color basic brightness value \8230, calculating the ratio of the selected basic brightness values to respectively obtain a first basic brightness ratio, a second basic brightness ratio \8230, a 8230and an nth basic brightness ratio; wherein n is greater than or equal to 1.
9. The apparatus for detecting a display panel according to claim 7, wherein the second obtaining module comprises:
the area brightness value acquisition module is used for extracting the brightness values of N color channels of each pixel point in the area to be detected in the display panel to be detected, and the brightness values are recorded as a first color area brightness value, a second color area brightness value of 8230, a No. 8230and a No. N color area brightness value;
the area brightness value processing module is used for selecting at least two area brightness values from the first color area brightness value and the second color area brightness value of each pixel point, calculating the ratio of the selected area brightness values, and respectively obtaining the first area brightness ratio, the second area brightness ratio, 8230, 8230and the nth area brightness ratio of each pixel point;
wherein n is greater than or equal to 1.
10. The apparatus according to any one of claims 7 to 9, further comprising an arithmetic processing module, wherein the arithmetic processing module is configured to perform arithmetic processing on the difference and present a judgment result.
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