CN114112323B - Detection method and detection device for display uniformity of display panel - Google Patents
Detection method and detection device for display uniformity of display panel Download PDFInfo
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- CN114112323B CN114112323B CN202111315455.9A CN202111315455A CN114112323B CN 114112323 B CN114112323 B CN 114112323B CN 202111315455 A CN202111315455 A CN 202111315455A CN 114112323 B CN114112323 B CN 114112323B
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- 238000001514 detection method Methods 0.000 title claims abstract description 112
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Abstract
The embodiment of the invention discloses a detection method and a detection device for display uniformity of a display panel, wherein the detection method comprises the following steps: collecting first optical data of reflected light reflected by the surface of the display panel after the film layer to be tested of the display panel is manufactured; determining gray scale data of a corresponding position of each sub-pixel in the display panel according to the first optical data; and determining the display uniformity of the display panel according to the gray-scale data of the corresponding position of each sub-pixel in the display panel and the first standard gray-scale data of the standard display panel. The optical data of the reflected light reflected by the display panel is acquired after the manufacturing of the film layer to be tested of the display panel is completed, the quantifiable gray-scale data with high repeatability and high accuracy are obtained, the gray-scale distribution on the front face of the display panel is calculated through the gray-scale data to macroscopically monitor the film quality change, and then the display uniformity change is fed back, so that the quantitative detection of the display uniformity of the display panel is realized, and the detection efficiency of the display uniformity of the display panel is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a detection method and a detection device for display uniformity of a display panel.
Background
An organic light-Emitting Diode (OLED) panel has advantages of self-luminescence, low driving voltage, high luminous efficiency, fast response speed, light weight, high contrast ratio, etc., and is increasingly used in devices with display functions such as mobile phones and computers.
The current detection mode of the display uniformity of the OLED display panel has the problems of low detection efficiency and incapability of quantification.
Disclosure of Invention
The embodiment of the invention provides a method and a device for detecting display uniformity of a display panel, which are used for realizing quantitative detection of the display uniformity of the display panel and improving the detection efficiency of the display uniformity of the display panel.
In a first aspect, an embodiment of the present invention provides a method for detecting display uniformity of a display panel, including:
collecting first optical data of reflected light reflected by the surface of the display panel after the film layer to be tested of the display panel is manufactured;
determining gray scale data of a position corresponding to each sub-pixel in the display panel according to the first optical data;
and determining the display uniformity of the display panel according to the gray-scale data of the corresponding position of each sub-pixel in the display panel and the first standard gray-scale data of the standard display panel.
Optionally, determining the display uniformity of the display panel according to the gray-scale data of the corresponding position of each sub-pixel in the display panel and the first standard gray-scale data of the standard display panel includes:
determining first to-be-detected gray scale distribution data of each to-be-detected area of the display panel according to gray scale data of a corresponding position of each sub-pixel in the display panel; the display panel comprises at least two areas to be detected;
determining first standard gray scale distribution data of an area corresponding to the standard display panel and the area to be detected according to the first standard gray scale data;
determining the display uniformity of the region to be detected according to the first gray scale distribution data to be detected and the first standard gray scale distribution data;
and determining the display uniformity of the display panel according to the display uniformity of each region to be detected.
Optionally, the first gray scale distribution data to be measured includes a median, a number of bits and a quartile; the first standard gray level distribution data comprises a median standard range, a crowd standard range and a quartile standard range;
determining the display uniformity of the to-be-detected area according to the first gray scale distribution data to be detected and the first standard gray scale distribution data, including:
if at least two of the median, the number of bits and the quartile meet the corresponding standard range, determining that the area to be detected is uniformly displayed;
if two of the median, the number of bits and the quartile do not meet the corresponding standard range, determining the to-be-detected area as a to-be-verified detection area;
and if all of the median, the crowd and the quartile do not meet the corresponding standard range, determining that the area to be detected is not uniformly displayed.
Optionally, the method further comprises:
collecting second optical data of reflected light reflected by a detection area to be verified;
removing the background optical data of other film layers except the film layer to be detected in the second optical data to obtain third optical data;
determining gray scale data of a position corresponding to each sub-pixel in the detection area to be verified according to the third optical data;
and determining the display uniformity of the detection area to be verified of the display panel according to the gray-scale data of the position corresponding to each sub-pixel in the detection area to be verified and the second standard gray-scale data of the standard display panel corresponding to the area to be verified.
Optionally, determining the display uniformity of the to-be-verified detection area of the display panel according to the gray-scale data of the corresponding position of each sub-pixel in the to-be-verified detection area and the second standard gray-scale data of the standard display panel corresponding to the to-be-verified area includes:
determining second gray scale distribution data to be tested of the detection area to be tested according to gray scale data of the corresponding position of each sub-pixel in the detection area to be tested;
determining second standard gray scale distribution data of an area corresponding to the standard display panel and the detection area to be verified according to the second standard gray scale data;
and determining the display uniformity of the detection area to be verified according to the second gray scale distribution data to be detected and the second standard gray scale distribution data.
Optionally, the first gray scale distribution data to be detected includes a first average value and a first variance, and the first standard gray scale distribution data includes a second average value and a second variance;
determining the display uniformity of the region to be detected according to the gray scale distribution data to be detected and the standard gray scale distribution data, including:
and determining the display uniformity of the region to be detected according to the first average value, the first variance, the second average value and the second variance.
Optionally, the display uniformity of the area to be detected is determined according to the following formula:
wherein x is 1 And x 2 As the weight value, x 1 +x 2 ＝1；stx s The first variance of the to-be-detected area of the display panel to be detected; stx is the second variance of the region of the standard display panel corresponding to the region to be detected; avgx s The first average value of the to-be-detected area of the display panel to be detected; avgx is a second average value of the area corresponding to the area to be detected in the standard display panel, and delta is the display uniformity of the area to be detected.
Optionally, determining the display uniformity of the display panel according to the display uniformity of each to-be-detected area includes:
determining the number of the to-be-detected areas which are unevenly displayed in the display panel;
and judging the display uniformity of the display panel according to the number of the to-be-detected areas which are unevenly displayed in the display panel.
Optionally, the film layer to be tested is any film layer in the driving circuit layer.
In a second aspect, an embodiment of the present invention provides a device for detecting display uniformity of a display panel, including:
the first optical data acquisition unit is used for acquiring first optical data of reflected light reflected by the film layer to be tested of the display panel to be tested;
the gray-scale data determining unit is used for determining gray-scale data of the corresponding position of each sub-pixel in the film layer to be detected according to the first optical data;
the judging and detecting unit is used for determining the display uniformity of the display panel according to the gray-scale data of the corresponding position of each sub-pixel in the film layer to be detected and the standard gray-scale data of the standard display panel.
The embodiment of the invention provides a detection method and a detection device for display uniformity of a display panel, wherein the detection method comprises the following steps: collecting first optical data of reflected light reflected by the surface of the display panel after the film layer to be tested of the display panel is manufactured; determining gray scale data of a corresponding position of each sub-pixel in the display panel according to the first optical data; and determining the display uniformity of the display panel according to the gray-scale data of the corresponding position of each sub-pixel in the display panel and the first standard gray-scale data of the standard display panel. According to the technical scheme provided by the embodiment of the invention, the optical data of the light reflected by the display panel is acquired after the film layer to be tested of the display panel is manufactured, the quantifiable, high-repeatability and high-accuracy gray scale data are obtained, the gray scale distribution of the front surface of the display panel is calculated through the extracted gray scale values to macroscopically monitor the film quality change, and then the display uniformity change is fed back, so that the quantitative detection of the display uniformity of the display panel is realized, and the detection efficiency of the display uniformity of the display panel is improved.
Drawings
Fig. 1 is a flowchart of a method for detecting display uniformity of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a gray scale coordinate model of a display panel to be tested according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a gray scale coordinate model of a standard display panel according to an embodiment of the present invention;
FIG. 4 is a flowchart of another method for detecting display uniformity of a display panel according to an embodiment of the present invention;
FIG. 5 is a diagram showing a distribution diagram of a region to be detected in a display panel according to an embodiment of the present invention;
FIG. 6 is a flowchart of another method for detecting display uniformity of a display panel according to an embodiment of the present invention;
FIG. 7 is a flowchart of another method for detecting display uniformity of a display panel according to an embodiment of the present invention;
fig. 8 is a block diagram of a display uniformity detecting device for a display panel according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the OLED display panel industry, mura (uneven display) is one of the defects that is extremely difficult to detect, and is mainly characterized by uneven local brightness display, and has the characteristics of unfixed distribution and unfixed shape, so that the display effect of the display panel is affected, and the display panel needs to detect display uniformity before leaving the factory. The current detection mode of the display uniformity of the OLED display panel has the problems of low detection efficiency and incapability of quantification. The display uniformity of the display panel is judged and identified mainly through uniformly trained identification personnel. However, the problem of large subjective difference is judged by human eyes, the visual effect of personnel is poor along with the decline of the attention of the personnel, the problem of large fluctuation of the identification capacity is also solved, the accuracy of the display uniformity detection of the display panel is reduced, even the condition of missed detection occurs, and the quantification of the detection result cannot be realized. Secondly, the OLED has extremely high environmental control requirements, and mura observation is in a semi-exposed state, so that the improvement of the yield of the OLED display panel is not facilitated. In addition, because the process stations (50+ processes) in the preparation process of the display panel are all observed by personnel after each station, the life cycle of the product is influenced.
In view of this, an embodiment of the present invention provides a method for detecting display uniformity of a display panel, and fig. 1 is a flowchart of a method for detecting display uniformity of a display panel provided by an embodiment of the present invention, and referring to fig. 1, the method for detecting display uniformity includes:
s110, collecting first optical data of reflected light reflected by the surface of the display panel after the film layer to be tested of the display panel is manufactured.
Specifically, a digital image capturing device (such as a CCD) may be used to obtain the first optical data. In the manufacturing process of the display panel, the process variation may cause defects in the film layer of the display panel, the abnormal film quality may cause the optical characteristics of the film layer to change, and the display unevenness of the display panel may cause abnormal film quality change of the display panel. The first optical data of the reflected light reflected by the surface of the display panel after the manufacture of the film layer to be tested of the display panel is completed can be collected, and the first optical data are identified through the change of the optical parameters of the film quality, so that the whole mura difference of the display panel is fed back. The first optical data reflects black-and-white image data of the display panel after the film layer to be measured is manufactured. The film layer to be tested can be any film layer in the driving circuit layer in the display panel, and the change of the film layer in the driving circuit layer has a large influence on the display uniformity of the display panel. Therefore, by collecting the first optical data of the reflected light reflected by the surface of the display panel after the manufacture of one film layer in the driving circuit layer of the display panel is completed, the display unevenness of the display panel can be more effectively monitored.
S120, determining gray-scale data of the corresponding position of each sub-pixel in the display panel according to the first optical data.
Specifically, gray scale data of the entire surface of the display panel can be determined according to the first optical data. The first optical data has a one-to-one correspondence with the reflection positions of the display panel, so that the gray scale data of the corresponding position of each sub-pixel in the display panel can be determined. Fig. 2 is a schematic diagram of a gray scale coordinate model of a to-be-detected area in a display panel according to an embodiment of the present invention, and referring to fig. 2, a gray scale coordinate model corresponding to gray scale data and position coordinates one by one may be fitted by a program, so as to facilitate visual detection of distribution of gray scale data of sub-pixels of the to-be-detected display panel by a detector. The x-axis and the y-axis determine the position of the sub-pixel, and the data on the z-axis perpendicular to the x-axis and the y-axis represents the gray scale data of the sub-pixel. For example, a programming language such as JAVA or python and a built-in image processing program can be used to combine, position coordinates and gray-scale data collected by the CCD are extracted, a mapping 3D relationship between the position coordinates and gray-scale values is determined according to the gray-scale data and the position coordinates corresponding to the gray-scale data one by one, and then a gray-scale coordinate model of the display panel to be tested is fitted. The noise data in the first optical data can be removed before the gray-scale data of the corresponding position of each sub-pixel in the display panel is determined according to the first optical data, so that the accuracy of the gray-scale data is further ensured.
S130, determining display uniformity of the display panel according to gray-scale data of a corresponding position of each sub-pixel in the display panel and first standard gray-scale data of the standard display panel.
Specifically, the standard display panel can be understood as a display panel with uniform display, the first standard gray-scale data can be determined according to standard optical data of the standard display panel, and the standard light data is optical data of reflected light reflected by the surface of the standard display panel after the preparation of the same film layer as the film layer to be tested of the display panel to be tested in the standard display panel is completed. The determined first standard gray-scale data can be stored in a database so as to be called when the display panel to be tested is tested, and therefore the testing time for determining the display uniformity of the display panel to be tested according to the gray-scale data of the corresponding position of each sub-pixel in the display panel to be tested and the first standard gray-scale data of the standard display panel is shortened. Fig. 3 is a schematic diagram of a gray scale coordinate model of a standard display panel according to an embodiment of the present invention, and referring to fig. 3, a gray scale coordinate model corresponding to gray scale data and position coordinates of the standard display panel one by one may be fitted by using a program, so as to realize visualization of gray scale data distribution conditions of sub-pixels of the standard display panel.
The method for detecting the display uniformity of the display panel provided by the embodiment of the invention comprises the following steps: collecting first optical data of reflected light reflected by the surface of the display panel after the film layer to be tested of the display panel is manufactured; determining gray scale data of a corresponding position of each sub-pixel in the display panel according to the first optical data; and determining the display uniformity of the display panel according to the gray-scale data of the corresponding position of each sub-pixel in the display panel and the first standard gray-scale data of the standard display panel. According to the technical scheme provided by the embodiment of the invention, the optical data of the light reflected by the display panel is acquired after the film layer to be tested of the display panel is manufactured, the quantifiable, high-repeatability and high-accuracy gray scale data are obtained, the gray scale distribution of the front surface of the display panel is calculated through the extracted gray scale values to macroscopically monitor the film quality change, and then the display uniformity change is fed back, so that the quantitative detection of the display uniformity of the display panel is realized, and the detection efficiency of the display uniformity of the display panel is improved.
Optionally, the first optical data of the reflected light reflected by the surface of the display panel after the film layer to be tested of the display panel is manufactured can be collected by an automatic optical detection (Automatic Optic Inspection, AOI) technology, and the optical data generated by the CCD in the AOI inspection procedure can be extracted by an image processing technology for introduction, so that the gray-scale data with high quantification, high repeatability and high accuracy can be obtained. The whole data of full base plate scanning cover product when AOI technique detects to AOI detects the chamber environment dust-free level and high, can guarantee the yield of product. In addition, the AOI is used as an indispensable detection procedure in the AMOLED process, so that the detection of the display uniformity of the display panel is combined with the AOI process, new manpower and equipment are not needed, and the manpower cost and the equipment cost are saved.
Fig. 4 is a flowchart of another method for detecting display uniformity of a display panel according to an embodiment of the present invention, and referring to fig. 4, the method includes:
s210, collecting first optical data of reflected light reflected by the surface of the display panel after the film layer to be tested of the display panel is manufactured.
S220, determining gray scale data of the corresponding position of each sub-pixel in the display panel according to the first optical data.
S230, determining first to-be-detected gray scale distribution data of each to-be-detected area of the display panel according to gray scale data of a corresponding position of each sub-pixel in the display panel; the display panel comprises at least two areas to be detected.
Specifically, fig. 5 is a distribution diagram of a to-be-detected area in a display panel according to an embodiment of the present invention, and referring to fig. 5, the display panel is divided into at least two to-be-detected areas, and each to-be-detected area needs to be detected for display uniformity, and 8 to-be-detected areas are exemplarily shown in fig. 5. And determining first gray scale distribution data to be detected of each region to be detected of the display panel according to the gray scale data of the corresponding position of each sub-pixel in the display panel. The first gray scale distribution data to be detected may be a median, a mode, a quartile or a variance determined according to the first gray scale data to be detected at a position corresponding to each sub-pixel in the area to be detected, which may integrally reflect statistical parameters of the gray scale distribution condition in the area to be detected.
S240, determining first standard gray scale distribution data of an area corresponding to the to-be-detected area of the standard display panel according to the first standard gray scale data.
Specifically, the first standard gray-scale distribution data may be standard judgment data determined according to the first standard gray-scale data, where the standard judgment data is used for judging whether parameters such as a median, a mode, a quartile or a variance of the first gray-scale data to be detected in the area to be detected are compliant. The first standard gray scale distribution data may be a reference value or a reference range.
S250, determining display uniformity of the region to be detected according to the first gray scale distribution data to be detected and the first standard gray scale distribution data.
Specifically, the difference between the gray-scale distribution condition of the to-be-detected area in the to-be-detected display panel and the gray-scale distribution condition of the area corresponding to the to-be-detected area in the standard display panel is determined according to the difference or the ratio of the first to-be-detected gray-scale distribution data and the first standard gray-scale distribution data, and the judgment on the gray-scale distribution condition of the to-be-detected area of the to-be-detected display panel is realized according to the difference between the gray-scale distribution condition of the to-be-detected display panel and the gray-scale distribution condition of the standard display panel, so that the display uniformity of the to-be-detected area is determined.
S260, determining the display uniformity of the display panel according to the display uniformity of each area to be detected.
Specifically, determining the display uniformity of the display panel according to the display uniformity of each region to be detected may include: determining the number of the to-be-detected areas which are unevenly displayed in the display panel; and judging the display uniformity of the display panel according to the number of the to-be-detected areas which are unevenly displayed in the display panel. The display uniformity may be divided into a plurality of levels, and the level of the display uniformity may be judged according to the number of the areas to be detected that are not uniformly displayed in the display panel. When the grade of the display uniformity does not meet the factory requirement of the product, the grade can be sent to staff for analysis and treatment through mails; if the gray-scale data is normal, continuing the next process flow of the preparation of the display panel.
Fig. 6 is a flowchart of another method for detecting display uniformity of a display panel according to an embodiment of the present invention, and referring to fig. 6, the method includes:
s310, collecting first optical data of reflected light reflected by the surface of the display panel after the film layer to be tested of the display panel is manufactured.
S320, determining gray-scale data of the corresponding position of each sub-pixel in the display panel according to the first optical data.
S330, determining first to-be-detected gray scale distribution data of each to-be-detected area of the display panel according to gray scale data of a corresponding position of each sub-pixel in the display panel; the display panel comprises at least two areas to be detected, and the first gray level distribution data to be detected comprises a median, a number of bits and a quartile.
S340, determining first standard gray scale distribution data of an area corresponding to the to-be-detected area of the standard display panel according to the first standard gray scale data; the first standard gray scale distribution data includes a median standard range, a crowd standard range, and a quartile standard range.
S350, judging whether the median is in the median standard range, whether the number of digits is in the number of digits standard range and whether the quartile is in the quartile standard range; if at least two of the median, the number of bits and the quartile meet the corresponding standard range, determining that the area to be detected is uniformly displayed; if two of the median, the number of digits and the quartile do not meet the corresponding standard range, determining the to-be-detected area as the to-be-verified detection area; if all of the median, the number of digits and the quartile do not meet the corresponding standard range, the display of the area to be detected is determined to be uneven.
Specifically, if two of the median, the number of digits and the quartile do not meet the corresponding standard range, determining the to-be-detected area as the to-be-verified detection area, and continuing to judge the display uniformity of the to-be-verified detection area.
Optionally, determining the display uniformity of the detection area to be verified includes:
collecting second optical data of reflected light reflected by a detection area to be verified;
removing the background optical data of other film layers except the film layer to be detected in the second optical data to obtain third optical data;
determining gray-scale data of the corresponding position of each sub-pixel in the detection area to be verified according to the third optical data;
and determining the display uniformity of the detection area to be verified of the display panel according to the gray-scale data of the position corresponding to each sub-pixel in the detection area to be verified and the second standard gray-scale data corresponding to the standard display panel and the detection area to be verified.
Specifically, the second optical data reflects color image data of the display panel after the film layer to be measured is manufactured. The second optical data of the reflected light reflected by the detection area to be verified can be determined by collecting the light reflected by the display panel after the preparation of the film to be detected is completed through the color camera. Removing the background optical data of other film layers except the film layer to be detected in the second optical data to obtain third optical data only including the actual color of the film layer to be detected, and determining gray scale data of the corresponding position of each sub-pixel in the detection area to be verified according to the third optical data. The second standard gray-scale data reflects the color image data of the same film layer as the film layer to be tested in the standard display panel. The second standard gray-scale data can be obtained by collecting standard color optical data of reflected light reflected by the surface of the standard display panel after the preparation of the film layer which is the same as the film layer to be detected is completed, and removing background optical data of other film layers except the film layer which is the same as the film layer to be detected in the standard color optical data. The determined second standard gray-scale data may be stored in a database for recall when the detection area to be verified is verified. And comparing the gray-scale data of the corresponding position of each sub-pixel in the detection area to be verified with the second standard gray-scale data of the standard display panel corresponding to the detection area to be verified, thereby determining the display uniformity of the detection area to be verified of the display panel. The color image of the display panel can be distinguished by collecting the color image of the display panel after the film to be tested is manufactured, so that third optical data only comprising the actual color of the film to be tested is extracted, gray scale data of the corresponding position of each sub-pixel in the detection area to be verified is determined according to the third optical data only comprising the actual color of the film to be tested, the influence of the film quality condition of the film to be tested on the uniformity of the display panel can be verified in a targeted manner, and the determination of the display uniformity of the detection area to be verified is realized.
Optionally, determining the display uniformity of the to-be-verified detection area of the display panel according to the gray-scale data of the corresponding position of each sub-pixel in the to-be-verified detection area and the second standard gray-scale data of the standard display panel corresponding to the to-be-verified area includes:
determining second gray scale distribution data to be tested of the detection area to be tested according to gray scale data of the corresponding position of each sub-pixel in the detection area to be tested;
determining second standard gray scale distribution data of an area corresponding to the detection area to be verified of the standard display panel according to the second standard gray scale data;
and determining the display uniformity of the detection area to be verified according to the second gray scale distribution data to be detected and the second standard gray scale distribution data.
Specifically, the second to-be-detected gray-scale data of the corresponding position of each sub-pixel in the to-be-detected detection area is determined according to the third optical data reflecting the actual color of the to-be-detected film layer, and the second to-be-detected gray-scale distribution data can be statistical parameters which can integrally reflect the gray-scale distribution condition in the to-be-detected area, such as the median, the mode, the quartile and the like, determined according to the second to-be-detected gray-scale data. The second standard gray-scale distribution data may be standard judgment data set according to the second standard gray-scale data, where the standard judgment data is used for judging whether parameters such as a median, a mode, a quartile and the like of the second gray-scale data to be detected in the region to be detected are compliant. The second standard gray scale distribution data may include a median reference range, a mode reference range, and a quartile reference range. In the process of determining the display uniformity of the detection area to be verified according to the second gray scale distribution data to be verified and the second standard gray scale distribution data, judging whether the median, the mode and the quartile of the second gray scale data to be verified are respectively located in the respective reference ranges, and determining that the detection area to be verified is uniform if at least one of the median, the mode and the quartile meets the corresponding reference range; otherwise, determining that the detection area to be verified is not uniformly displayed. The distribution condition of gray scales in the detection area to be verified can be comprehensively reflected through statistical parameters such as median, number of digits, quartile and the like, and the accuracy of display uniformity judgment of the detection area to be verified is improved.
S360, determining the display uniformity of the display panel according to the display uniformity of each area to be detected.
According to the method for detecting the display uniformity of the display panel, the first optical data of the light reflected by the display panel is collected after the film layer to be detected of the display panel is manufactured, and the first gray scale data to be detected of different areas to be detected are determined according to the first optical data. The first gray level distribution data to be detected, which is determined according to the first gray level data to be detected, comprises a median, a number of bits and a number of quartiles, and whether the median, the number of bits and the number of quartiles are located in a median reference range, a number of bits reference range and a number of quartiles reference range which are set according to the first standard gray level data is judged. Judging that the detection area to be detected is mura defect when all three reference dimensions are in an ultra-rule; if the two reference dimensions are out of specification, color image data of the display panel after the film layer to be detected is manufactured is introduced to assist in judging the display uniformity of the detection area to be detected, the distribution condition of gray scales in the detection area can be comprehensively reflected through statistical parameters such as the median, the number of digits and the quartile, the accuracy of judging the display uniformity of the detection area is improved, and the accuracy of detecting the display uniformity of the display panel to be detected is further improved.
Fig. 7 is a flowchart of another method for detecting display uniformity of a display panel according to an embodiment of the present invention, and referring to fig. 7, the method includes:
s410, collecting first optical data of reflected light reflected by the surface of the display panel after the film layer to be tested of the display panel is manufactured.
S420, determining gray-scale data of a corresponding position of each sub-pixel in the display panel according to the first optical data.
S430, determining first to-be-detected gray scale distribution data of each to-be-detected area of the display panel according to gray scale data of a corresponding position of each sub-pixel in the display panel; the display panel comprises at least two areas to be detected, and the first gray scale distribution data to be detected comprises a first average value and a first variance.
S440, determining first standard gray scale distribution data of an area corresponding to the to-be-detected area of the standard display panel according to the first standard gray scale data; the first standard gray scale distribution data includes a second average value and a second variance.
S450, determining the display uniformity of the area to be detected according to the first average value, the first variance, the second average value and the second variance.
Specifically, the display panel comprises at least two areas to be detected, a first average value and a first variance of first gray-scale data to be detected corresponding to each area to be detected are calculated, and the average value and the variance are used for detecting and judging the display uniformity of the areas to be detected. Referring to fig. 5, the display panel includes 8 areas to be detected, and when the first area to be detected 1 is determined, gray-scale data of the area is collected, and a first average value and a first variance of the first gray-scale data to be detected in the first area to be detected are calculated. And determining first standard gray-scale data of a region corresponding to the first detection region 1 to be detected in the standard display panel, and calculating a second average value and a second variance of the first standard gray-scale data. And determining the display uniformity of the region to be detected according to the first average value, the first variance, the second average value and the second variance. Wherein determining the display uniformity of the region to be detected according to the first average, the first variance, the second average, and the second variance is determined based on the following formula:
wherein x is 1 And x 2 As the weight value, x 1 +x 2 ＝1；stx s The first variance of the to-be-detected area of the display panel to be detected; stx is the second variance of the region of the standard display panel corresponding to the region to be detected; avgx s The first average value of the to-be-detected area of the display panel to be detected; avgx is a second average value of the area corresponding to the area to be detected in the standard display panel, and delta is the display uniformity of the area to be detected. And judging the display uniformity of the area to be detected according to the delta value.
Specifically, x 1 The range of the values of (2) comprises 0.1-0.3, x 2 The range of the values of (2) comprises 0.7-0.9, x 2 Can be according to the size of avgx-avgx s Is adjusted to be x as the absolute value of the difference is larger 2 The larger the value is. The standard display uniformity of the standard display panel can be calculated based on the formula according to the second average value and the second variance, and the standard display uniformity reference range is set according to the standard display uniformity. If the display uniformity delta of the area to be detected is within the standard display uniformity reference range, determining that the area to be detected is uniformly displayed; and if the display uniformity delta of the area to be detected exceeds the standard display uniformity reference range, determining that the area to be detected is not uniform in display. In addition, if the display uniformity delta of the to-be-detected area is within the standard display uniformity reference range but is near the boundary, determining the to-be-detected area as the to-be-verified detection area, and to-be-verifiedThe detection area continues to display a judgment of uniformity. The determination of the display uniformity of the detection area to be verified may be performed according to the verification manner in the previous embodiment, which is not described herein. Or after the second optical data is collected to determine the second gray-scale data to be measured, the display uniformity delta of the second gray-scale data to be measured is calculated to judge.
S460, determining the display uniformity of the display panel according to the display uniformity of each area to be detected.
According to the method for detecting the display uniformity of the display panel, the first optical data of the light reflected by the display panel is collected after the film layer to be detected of the display panel is manufactured, and the first gray scale data to be detected of different areas to be detected are determined according to the first optical data. And determining the uniformity of the region to be detected by comparing the first average value and the first variance of the first gray-scale data to be detected with the second average value and the second variance of the region corresponding to the region to be detected in the standard display panel. By calculating the average value and the variance of the first gray-scale data to be detected, the fluctuation condition of the gray-scale data in the area to be detected relative to the set specification line can be integrally reflected, the accuracy of the uniformity detection of the display of the area to be detected is improved, and the accuracy of the uniformity detection of the display panel to be detected is further improved.
The embodiment of the invention also provides a device for detecting display uniformity of a display panel, and fig. 8 is a structural block diagram of the device for detecting display uniformity of the display panel, and referring to fig. 8, the device for detecting display uniformity of the display panel comprises:
the first optical data acquisition unit 10 is used for acquiring first optical data of reflected light reflected by a film layer to be tested of the display panel to be tested;
the gray-scale data determining unit 20 is configured to determine gray-scale data of a position corresponding to each sub-pixel in the film layer to be tested according to the first optical data;
the judging and detecting unit 30 is configured to determine display uniformity of the display panel according to gray-scale data of a corresponding position of each sub-pixel in the film layer to be detected and standard gray-scale data of the standard display panel.
Optionally, the judging and detecting unit includes:
the first to-be-detected gray scale distribution data determining subunit is used for determining first to-be-detected gray scale distribution data of each to-be-detected area of the display panel according to gray scale data of a corresponding position of each sub-pixel in the display panel; the display panel comprises at least two areas to be detected;
the first standard gray scale distribution data determining subunit is used for determining first standard gray scale distribution data of an area corresponding to the to-be-detected area of the standard display panel according to the first standard gray scale data;
the to-be-detected area uniformity judging subunit is used for determining the display uniformity of the to-be-detected area according to the first to-be-detected gray level distribution data and the first standard gray level distribution data;
and the display uniformity judging subunit is used for determining the display uniformity of the display panel according to the display uniformity of each area to be detected.
Optionally, the display uniformity judging subunit of the display panel is configured to determine the number of to-be-detected areas that are not uniformly displayed in the display panel; and judging the display uniformity of the display panel according to the number of the to-be-detected areas which are unevenly displayed in the display panel.
Optionally, the first gray level distribution data to be measured includes a median, a number of bits, and a quartile; the first standard gray level distribution data comprises a median standard range, a crowd number standard range and a quartile standard range;
the to-be-detected area uniformity judging subunit is used for determining that the to-be-detected area is uniformly displayed when at least two of the median, the number of bits and the quartile meet the corresponding standard range; when two of the median, the number of bits and the quartile do not meet the corresponding standard range, determining the to-be-detected area as the to-be-verified detection area; and when all of the median, the number of bits and the quartile do not meet the corresponding standard range, determining that the area to be detected is unevenly displayed.
The judgment detection unit further includes: the detection area to be verified shows a uniformity judgment subunit,
the display uniformity judging subunit of the detection area to be verified comprises a second optical data acquisition subunit, which is used for acquiring second optical data of reflected light reflected by the detection area to be verified;
a third optical data determining subunit, configured to remove background optical data of other film layers except the film layer to be measured in the second optical data, to obtain third optical data;
the detection area gray-scale data determination subunit is used for determining gray-scale data of a position corresponding to each sub-pixel in the detection area to be verified according to the third optical data;
the display uniformity determination subunit is configured to determine display uniformity of the to-be-verified detection area of the display panel according to gray-scale data corresponding to a position of each sub-pixel in the to-be-verified detection area and second standard gray-scale data corresponding to the to-be-verified area of the standard display panel.
Optionally, the detecting area to be verified displays a uniformity determining subunit, including:
the second to-be-verified gray scale distribution data determining subunit is used for determining the second to-be-verified gray scale distribution data of the to-be-verified detection area according to the gray scale data of the corresponding position of each sub-pixel in the to-be-verified detection area;
the second standard gray scale distribution data determining subunit is used for determining second standard gray scale distribution data of an area corresponding to the detection area to be verified of the standard display panel according to the second standard gray scale data;
and the uniformity determination subunit is used for determining the display uniformity of the detection area to be verified according to the second gray level distribution data to be detected and the second standard gray level distribution data.
Optionally, the first gray scale distribution data to be measured includes a first average value and a first variance, and the first standard gray scale distribution data includes a second average value and a second variance; the uniformity judging subunit of the area to be detected is further configured to determine display uniformity of the area to be detected according to the first average value, the first variance, the second average value and the second variance.
Optionally, the to-be-detected area uniformity judging subunit is configured to determine the display uniformity of the to-be-detected area according to the following formula:
wherein x is 1 And x 2 As the weight value, x 1 +x 2 ＝1；stx s The first variance of the to-be-detected area of the display panel to be detected; stx is the second variance of the region of the standard display panel corresponding to the region to be detected; avgx s The first average value of the to-be-detected area of the display panel to be detected; the avgx is a second average value of the area corresponding to the area to be detected in the standard display panel.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. A method for detecting display uniformity of a display panel, comprising:
collecting first optical data of reflected light reflected by the surface of the display panel after the film layer to be tested of the display panel is manufactured;
determining gray scale data of a position corresponding to each sub-pixel in the display panel according to the first optical data;
determining the display uniformity of the display panel according to the gray-scale data of the corresponding position of each sub-pixel in the display panel and the first standard gray-scale data of the standard display panel;
the method for detecting the display uniformity of the display panel further comprises the following steps:
collecting second optical data of reflected light reflected by a detection area to be verified;
removing the background optical data of other film layers except the film layer to be detected in the second optical data to obtain third optical data;
determining gray scale data of a position corresponding to each sub-pixel in the detection area to be verified according to the third optical data;
and determining the display uniformity of the detection area to be verified of the display panel according to the gray-scale data of the position corresponding to each sub-pixel in the detection area to be verified and the second standard gray-scale data of the standard display panel corresponding to the area to be verified.
2. The method for detecting display uniformity of a display panel according to claim 1, wherein determining the display uniformity of the display panel according to the gray-scale data of the corresponding position of each sub-pixel in the display panel and the first standard gray-scale data of the standard display panel comprises:
determining first to-be-detected gray scale distribution data of each to-be-detected area of the display panel according to gray scale data of a corresponding position of each sub-pixel in the display panel; the display panel comprises at least two areas to be detected;
determining first standard gray scale distribution data of an area corresponding to the standard display panel and the area to be detected according to the first standard gray scale data;
determining the display uniformity of the region to be detected according to the first gray scale distribution data to be detected and the first standard gray scale distribution data;
and determining the display uniformity of the display panel according to the display uniformity of each region to be detected.
3. The method for detecting display uniformity of a display panel according to claim 2, wherein,
the first gray level distribution data to be detected comprises a median, a number of bits and a quartile; the first standard gray level distribution data comprises a median standard range, a crowd standard range and a quartile standard range;
determining the display uniformity of the to-be-detected area according to the first gray scale distribution data to be detected and the first standard gray scale distribution data, including:
if at least two of the median, the number of bits and the quartile meet the corresponding standard range, determining that the area to be detected is uniformly displayed;
if two of the median, the number of bits and the quartile do not meet the corresponding standard range, determining the to-be-detected area as a to-be-verified detection area;
and if all of the median, the crowd and the quartile do not meet the corresponding standard range, determining that the area to be detected is not uniformly displayed.
4. The method for detecting display uniformity of a display panel according to claim 1, wherein determining the display uniformity of the display panel to be verified according to gray-scale data of a position corresponding to each sub-pixel in the to-be-verified detection area and second standard gray-scale data of a standard display panel corresponding to the to-be-verified area comprises:
determining second gray scale distribution data to be tested of the detection area to be tested according to gray scale data of the corresponding position of each sub-pixel in the detection area to be tested;
determining second standard gray scale distribution data of an area corresponding to the standard display panel and the detection area to be verified according to the second standard gray scale data;
and determining the display uniformity of the detection area to be verified according to the second gray scale distribution data to be detected and the second standard gray scale distribution data.
5. The method for detecting display uniformity of a display panel according to claim 2, wherein the first gray-scale distribution data to be detected comprises a first average value and a first variance, and the first standard gray-scale distribution data comprises a second average value and a second variance;
determining the display uniformity of the region to be detected according to the gray scale distribution data to be detected and the standard gray scale distribution data, including:
and determining the display uniformity of the region to be detected according to the first average value, the first variance, the second average value and the second variance.
6. The method for detecting display uniformity of a display panel according to claim 5, wherein said display uniformity of said area to be detected is determined according to the following formula:
wherein x is 1 And x 2 As the weight value, x 1 +x 2 ＝1；stx s The first variance of the to-be-detected area of the display panel to be detected; stx is the second variance of the region of the standard display panel corresponding to the region to be detected; avgx s The first average value of the to-be-detected area of the display panel to be detected; avgx is a second average value of the area corresponding to the area to be detected in the standard display panel, and delta is the display uniformity of the area to be detected.
7. The method for detecting display uniformity of a display panel according to claim 2, wherein determining the display uniformity of the display panel according to the display uniformity of each of the areas to be detected comprises:
determining the number of the to-be-detected areas which are unevenly displayed in the display panel;
and judging the display uniformity of the display panel according to the number of the to-be-detected areas which are unevenly displayed in the display panel.
8. The method for detecting display uniformity of a display panel according to claim 1, wherein the film to be detected is any one of the driving circuit layers.
9. A device for detecting display uniformity of a display panel, comprising:
the first optical data acquisition unit is used for acquiring first optical data of reflected light reflected by the film layer to be tested of the display panel to be tested;
the gray-scale data determining unit is used for determining gray-scale data of the corresponding position of each sub-pixel in the film layer to be detected according to the first optical data;
the judging and detecting unit is used for determining the display uniformity of the display panel according to the gray-scale data of the corresponding position of each sub-pixel in the film layer to be detected and the standard gray-scale data of the standard display panel;
the judgment detection unit further includes: the detection area to be verified shows a uniformity judgment subunit,
the display uniformity judging subunit of the detection area to be verified comprises a second optical data acquisition subunit, which is used for acquiring second optical data of reflected light reflected by the detection area to be verified;
a third optical data determining subunit, configured to remove background optical data of other film layers except the film layer to be measured in the second optical data, to obtain third optical data;
the detection area gray-scale data determination subunit is used for determining gray-scale data of a position corresponding to each sub-pixel in the detection area to be verified according to the third optical data;
the display uniformity determination subunit is configured to determine display uniformity of the to-be-verified detection area of the display panel according to gray-scale data corresponding to a position of each sub-pixel in the to-be-verified detection area and second standard gray-scale data corresponding to the to-be-verified area of the standard display panel.
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