Photoelectric display screen pixel brightness and chrominance measurement method, device and equipment and storage medium

Abstract

The invention discloses a photoelectric display screen pixel brightness and chrominance measurement method, device and equipment and a storage medium, and the method comprises the steps: carrying out the brightness and chrominance measurement of a to-be-measured display screen through a first measurement device when the to-be-measured display screen is located at a first position, a second position and a third position, obtaining three measurement value matrixes, and calculating the brightness and chrominance of the to-be-measured display screen according to the three measurement value matrixes; a row difference matrix and a column difference matrix are calculated, the first position and the second position are spaced by one pixel in the direction of one coordinate axis of the imaging plane of the display screen to be measured, and the second position and the third position are spaced by one pixel in the direction of the other coordinate axis; a reference pixel is determined in the display screen to be measured, and a brightness and chrominance standard value of the reference pixel is obtained through measurement of a second measurement device; and according to the brightness and chrominance standard value of the reference pixel, the row difference matrix and the column difference matrix, calculating to obtain the brightness and chrominance standard value of each pixel in the display screen to be detected. According to the invention, high-efficiency and high-precision measurement of the pixel-level brightness and chrominance of the photoelectric display screen can be realized.

Description

Technical Field

[0001] The present invention relates to the field of optoelectronic display detection technology, and in particular to a method, device, equipment and storage medium for measuring the brightness and chromaticity of pixels on an optoelectronic display screen. Background Art

[0002] Accurately measuring the brightness and chromaticity (hereinafter referred to as brightness chromaticity) of the pixels of the optoelectronic display screen (hereinafter referred to as the display screen) is of great significance for improving the display quality of the display screen and improving the production process of the display screen. The pixel-level brightness and chromaticity measurement of the display screen generally uses a point-type spectrometer or an imaging brightness colorimeter.

[0003] The point-by-point spectrometer adopts the spectral method, with high measurement accuracy (brightness accuracy ±2%, chromaticity coordinate deviation ±0.0015), small measurement area (up to μm 2 level), but only one pixel can be measured at a time, positioning and focusing are extremely difficult, and the test efficiency is extremely low.

[0004] Imaging brightness colorimeter uses CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) sensor imaging method, which can measure the brightness and chromaticity parameters of all pixels in a large area display screen at one time (the pixel resolution of imaging brightness colorimeter has 61 million, 151 million and other specifications). The measurement process is simple and the measurement efficiency is extremely high, but the measurement accuracy is low (the brightness accuracy is claimed to be ±3% and the chromaticity coordinate deviation is ±0.003, but this is for the measurement of uniform surface light sources. When actually measuring the brightness and chromaticity of the display screen at the pixel level, due to the presence of non-luminous areas between pixels and the fact that the brightness and chromaticity values ​​of each pixel may vary greatly, the actual measurement accuracy of pixel brightness is only ±12% and the chromaticity coordinate deviation is ±0.007).

[0005] In the article "Study on Pixel-Level Accurate Acquisition and Correction Technology for Ultra-High Density LED Display Screens", a pixel shift compensation method is proposed to correct the optical acquisition and transmission error of LED display screens. This method realizes the relative movement of display pixels in the imaging pixel position by moving the camera position, and realizes the overlap of different display pixels on the same pixel. In order to correct the optical transmission error, this method uses the same relationship between the optical transmission errors of different pixels in the same area of ​​camera imaging, and the three sets of independent and complete pixel brightness and chromaticity information acquired by the camera after shifting and time-sharing acquisition just make the three sets of brightness and chromaticity information acquired by the camera in the same area belong to different pixels. Therefore, the three sets of pixel brightness and chromaticity information collected are used as variables to establish a first-order differential equation for each area, and obtain the true brightness and chromaticity ratio coefficient between adjacent display pixels. The ratio coefficient is multiplied by the average brightness and chromaticity of all pixel points measured by the camera to obtain the true brightness and chromaticity value of each pixel point.

[0006] However, the above method cannot obtain the true brightness and chromaticity values ​​of each pixel. According to the above method, a series of true brightness and chromaticity ratio coefficients between pixels can indeed be obtained, but multiplying this ratio coefficient with the average brightness and chromaticity of all pixels measured by the camera cannot obtain the true brightness and chromaticity value of each pixel, but only the relative brightness and chromaticity value of the pixel that eliminates some optical acquisition transmission errors.

[0007] In addition, the formula for calculating the proportionality coefficient of the above method is: proportionality coefficient = difference between the brightness and chromaticity values ​​of two adjacent pixels / sum of the brightness and chromaticity values ​​of two adjacent pixels. When the brightness and chromaticity values ​​of two adjacent pixels are very close, the proportionality coefficient is approximately 0, which will cause a large error in subsequent calculations. At the same time, the pixel brightness and chromaticity measurement value of the above method is expressed as: pixel brightness and chromaticity measurement value = pixel brightness and chromaticity true value × error coefficient. Due to the use of the multiplication representation method, it causes problems such as large amount of calculation, large error, and inconvenient programming. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a method, device, equipment and storage medium for measuring the brightness and chromaticity of pixels of an optoelectronic display screen, which can realize efficient and high-precision measurement of the brightness and chromaticity of pixels at the optoelectronic display screen.

[0009] In a first aspect, the present invention provides a method for measuring the brightness and chromaticity of pixels of an optoelectronic display screen, comprising:

[0010] When the display screen to be tested is located at a first position, a second position, and a third position, respectively, the brightness and chromaticity of the display screen to be tested are measured by a first measuring device to obtain three measurement value matrices, and a row difference matrix and a column difference matrix are calculated according to the three measurement value matrices, wherein the first position and the second position are one pixel apart in a direction of one coordinate axis of an imaging plane of the display screen to be tested, and the second position and the third position are one pixel apart in a direction of another coordinate axis of the imaging plane of the display screen to be tested;

[0011] Determine a reference pixel in the display screen to be tested, and obtain the brightness and chromaticity standard value of the reference pixel by measuring with a second measuring device;

[0012] The brightness and chromaticity standard values ​​of each pixel in the display screen to be tested are calculated based on the brightness and chromaticity standard values ​​of the reference pixels and the row difference matrix and the column difference matrix.

[0013] In a second aspect, the present invention further provides a device for measuring the brightness and chromaticity of pixels of an optoelectronic display screen, comprising:

[0014] A first measuring module is used to measure the brightness and chromaticity of the display screen to be measured by a first measuring device when the display screen to be measured is located at a first position, a second position, and a third position, respectively, to obtain three measurement value matrices, and to calculate a row difference matrix and a column difference matrix according to the three measurement value matrices, wherein the first position and the second position are one pixel apart in a direction of one coordinate axis of an imaging plane of the display screen to be measured, and the second position and the third position are one pixel apart in a direction of another coordinate axis of the imaging plane of the display screen to be measured;

[0015] A second measuring module is used to determine a reference pixel in the display screen to be tested, and obtain a brightness and chromaticity standard value of the reference pixel by measuring with a second measuring device;

[0016] The calculation module is used to calculate the brightness and chromaticity standard value of each pixel in the display screen to be tested according to the brightness and chromaticity standard value of the reference pixel and the row difference matrix and the column difference matrix.

[0017] In a third aspect, the present invention further provides an electronic device, the electronic device comprising:

[0018] one or more processors;

[0019] A storage device for storing one or more programs;

[0020] When the one or more programs are executed by the one or more processors, the one or more processors implement the method for measuring the brightness and chromaticity of pixels of an optoelectronic display screen as provided in the first aspect.

[0021] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method for measuring the brightness and chromaticity of pixels of an optoelectronic display screen as provided in the first aspect is implemented.

[0022] The beneficial effects of the present invention are as follows: by using a first measuring device (such as an imaging brightness colorimeter) to quickly measure the brightness and chromaticity values ​​of all pixels of the display screen to be tested three times, and using a second measuring device (such as a plotting point spectrometer) to accurately measure the brightness and chromaticity values ​​of reference pixels, high-precision brightness and chromaticity values ​​of all pixels on the display screen to be tested can be obtained through a pixel spacing displacement difference elimination method, which not only ensures high measurement efficiency but also ensures measurement accuracy, thereby achieving efficient and high-precision measurement of pixel-level brightness and chromaticity of optoelectronic display screens. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A flow chart of a method for measuring the brightness and chromaticity of pixels on a photoelectric display screen provided by the present invention;

[0024] Figure 2 A schematic diagram of the structure of a device for measuring the brightness and chromaticity of pixels on a photoelectric display screen provided by the present invention;

[0025] Figure 3 A schematic diagram of the structure of an electronic device provided by the present invention;

[0026] Figure 4 This is a flow chart of a method for measuring the brightness and chromaticity of pixels on an optoelectronic display screen according to a first embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of using an imaging brightness colorimeter to perform a first brightness and chromaticity measurement of a display screen to be tested according to the first embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of using an imaging brightness colorimeter to perform a second brightness and chromaticity measurement of a display screen to be measured according to the first embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of using an imaging brightness colorimeter to perform a third brightness and chromaticity measurement of a display screen to be measured according to the first embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the test viewing angle of different areas by the imaging brightness colorimeter;

[0031] Fig. 9 This is a schematic diagram of sub-area division according to the first embodiment of the present invention;

[0032] Fig.10 Schematic diagram of reference pixels in each sub-region of the first embodiment of the present invention Figure 1 ;

[0033] Fig.11 Schematic diagram of reference pixels in each sub-region of the first embodiment of the present invention Figure 2 . DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0035] Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe the steps as sequential processes, many of the steps therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of the steps can be rearranged. The process can be terminated when its operation is completed, but can also have additional steps not included in the accompanying drawings. The process can correspond to a method, function, procedure, subroutine, sub-computer program, etc.

[0036] In addition, the terms "first", "second", etc. can be used in this article to describe various directions, actions, steps or elements, etc., but these directions, actions, steps or elements are not limited by these terms. These terms are only used to distinguish a first direction, action, step or element from another direction, action, step or element. For example, without departing from the scope of the present application, the first information can be referred to as the second information, and similarly, the second information can be referred to as the first information. Both the first information and the second information are information, but they are not the same information. The terms "first", "second", etc. cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" can expressly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] like Figure 1 As shown, a method for measuring the brightness and chromaticity of pixels on an optoelectronic display screen comprises:

[0038] When the display screen to be tested is located at a first position, a second position, and a third position, respectively, the brightness and chromaticity of the display screen to be tested are measured by a first measuring device to obtain three measurement value matrices, and a row difference matrix and a column difference matrix are calculated according to the three measurement value matrices, wherein the first position and the second position are one pixel apart in a direction of one coordinate axis of an imaging plane of the display screen to be tested, and the second position and the third position are one pixel apart in a direction of another coordinate axis of the imaging plane of the display screen to be tested;

[0039] Determine a reference pixel in the display screen to be tested, and obtain the brightness and chromaticity standard value of the reference pixel by measuring with a second measuring device;

[0040] The brightness and chromaticity standard values ​​of each pixel in the display screen to be tested are calculated based on the brightness and chromaticity standard values ​​of the reference pixels and the row difference matrix and the column difference matrix.

[0041] From the above description, it can be seen that efficient and high-precision measurement of pixel-level brightness and chromaticity of an optoelectronic display screen can be achieved.

[0042] In an optional embodiment, when the display screen to be tested is located at the first position, the second position and the third position, the brightness and chromaticity of the display screen to be tested is measured by a first measuring device to obtain three measurement value matrices, and a row difference matrix and a column difference matrix are calculated according to the three measurement value matrices, including:

[0043] Performing a first brightness and chromaticity measurement of the display screen to be measured by a first measuring device to obtain a first measurement value matrix;

[0044] After the display screen to be tested is moved along a coordinate axis of its imaging plane by a pixel distance, the brightness and chromaticity of the display screen to be tested is measured for the second time by the first measuring device to obtain a second measurement value matrix;

[0045] After the display screen to be tested is moved along another coordinate axis of its imaging plane by a pixel distance, the brightness and chromaticity of the display screen to be tested is measured for the third time by the first measuring device to obtain a third measurement value matrix;

[0046] A row difference matrix and a column difference matrix are calculated according to the first measurement value matrix, the second measurement value matrix and the third measurement value matrix.

[0047] From the above description, it can be seen that by moving a pixel distance along the direction of the coordinate axis, adjacent pixels are measured by the same group of pixels in the measuring device in the previous and subsequent measurements. The measurement error of the same group of pixels can be eliminated by calculating the difference between the two previous and subsequent measurement values, thereby obtaining the difference in the true brightness and chromaticity values ​​of adjacent pixels.

[0048] In an optional embodiment, when the one coordinate axis is the X-axis and the other coordinate axis is the Y-axis, the measurement values ​​obtained by measuring the same group of photosensitive chip pixels of the first measuring device in the first measurement value matrix and the second measurement value matrix are subtracted to obtain a column difference matrix, and the measurement values ​​obtained by measuring the same group of photosensitive chip pixels of the first measuring device in the second measurement value matrix and the third measurement value matrix are subtracted to obtain a row difference matrix;

[0049] When one coordinate axis is the Y axis and the other coordinate axis is the X axis, the measurement values ​​obtained by measuring the same group of photosensitive chip pixels of the first measuring device in the first measurement value matrix and the second measurement value matrix are subtracted to obtain a row difference matrix, and the measurement values ​​obtained by measuring the same group of photosensitive chip pixels of the first measuring device in the second measurement value matrix and the third measurement value matrix are subtracted to obtain a column difference matrix.

[0050] In an optional embodiment, the step of determining a reference pixel in the display screen to be tested, and measuring the brightness and chromaticity standard value of the reference pixel by a second measuring device; and calculating the brightness and chromaticity standard value of each pixel in the display screen to be tested according to the brightness and chromaticity standard value of the reference pixel and the row difference matrix and the column difference matrix, comprises:

[0051] Divide the display screen to be tested into regions to obtain at least one sub-region;

[0052] Determine a reference pixel in each sub-area, and obtain the brightness and chromaticity standard value of each reference pixel by measuring with a second measuring device;

[0053] The standard brightness and chromaticity values ​​of each pixel in each sub-region are calculated according to the standard brightness and chromaticity values ​​of the reference pixels in each sub-region and the row difference matrix and the column difference matrix.

[0054] In an optional embodiment, the step of calculating the brightness and chromaticity standard value of each pixel in each sub-region according to the brightness and chromaticity standard value of the reference pixel in each sub-region and the row difference matrix and the column difference matrix includes:

[0055] Determine the sub-row difference matrix and the sub-column difference matrix corresponding to each sub-region;

[0056] The brightness and chromaticity standard values ​​of each pixel in a sub-region are calculated according to the brightness and chromaticity standard values ​​of the reference pixels in the sub-region and the sub-row difference matrix and the sub-column difference matrix corresponding to the sub-region.

[0057] It can be seen from the above description that by dividing the display screen to be measured into a plurality of sub-areas, the measurement error caused by different viewing angles when the measuring device measures different areas of the display screen can be eliminated.

[0058] In an optional embodiment, the measurement efficiency of the first measuring device is greater than the measurement efficiency of the second measuring device, and the measurement accuracy of the second measuring device is higher than the measurement accuracy of the first measuring device.

[0059] In an optional embodiment, the first measuring device is an imaging brightness colorimeter, and the second measuring device is a plotting spectrometer.

[0060] From the above description, it can be seen that using an imaging brightness colorimeter with high measurement efficiency to measure all pixels and using a plotting point spectrometer with high measurement accuracy to accurately measure reference pixels can ensure high measurement efficiency while ensuring measurement accuracy.

[0061] like Figure 2 As shown, the present invention also provides a pixel brightness and chromaticity measurement device, comprising:

[0062] A first measuring module 201 is used to measure the brightness and chromaticity of the display screen to be measured by a first measuring device when the display screen to be measured is located at a first position, a second position, and a third position, respectively, to obtain three measurement value matrices, and to calculate a row difference matrix and a column difference matrix according to the three measurement value matrices, wherein the first position and the second position are one pixel apart in a direction of one coordinate axis of an imaging plane of the display screen to be measured, and the second position and the third position are one pixel apart in a direction of another coordinate axis of the imaging plane of the display screen to be measured;

[0063] A second measuring module 202 is used to determine a reference pixel in the display screen to be tested, and obtain a brightness and chromaticity standard value of the reference pixel by measuring with a second measuring device;

[0064] The calculation module 203 is used to calculate the brightness and chromaticity standard value of each pixel in the display screen to be tested according to the brightness and chromaticity standard value of the reference pixel and the row difference matrix and the column difference matrix.

[0065] like Figure 3 As shown, the present invention also provides an electronic device, the electronic device comprising:

[0066] One or more processors 301;

[0067] Storage device 302, used to store one or more programs;

[0068] When the one or more programs are executed by the one or more processors 301 , the one or more processors 301 implement the method as described above.

[0069] The present invention also provides a computer-readable storage medium having a computer program stored thereon, and the computer program implements the above method when executed by a processor.

[0070] Embodiment 1

[0071] Please refer to Figure 4-11 Embodiment 1 of the present invention is: a method for measuring the brightness and chromaticity of pixels of an optoelectronic display screen, which can be applied to measuring the brightness and chromaticity of pixels of an optoelectronic display screen (including LCD, OLED, LED and other display screens).

[0072] like Figure 4As shown, the following steps are included:

[0073] S1: When the display screen to be tested is located at a first position, a second position, and a third position, respectively, the brightness and chromaticity of the display screen to be tested are measured by a first measuring device to obtain three measurement value matrices, and a row difference matrix and a column difference matrix are calculated according to the three measurement value matrices.

[0074] Wherein, on the imaging plane of the display screen to be tested, with the upper left corner point as the origin, the right direction as the positive direction of the X axis, and the downward direction as the positive direction of the Y axis, a plane coordinate system is established. The first position and the second position are one pixel apart in a coordinate axis direction of the imaging plane of the display screen to be tested, and the second position and the third position are one pixel apart in another coordinate axis direction of the imaging plane of the display screen to be tested.

[0075] In this embodiment, the first measuring device is an imaging brightness colorimeter.

[0076] Specifically, the first brightness and chromaticity measurement of the display screen to be tested is performed by an imaging brightness colorimeter, and the first measurement value matrix can be obtained at this time; then, the display screen to be tested is moved along one coordinate axis of its imaging plane by one pixel distance, and the second brightness and chromaticity measurement is performed by the imaging brightness colorimeter, and the second measurement value matrix can be obtained at this time; then, the display screen to be tested is moved along another coordinate axis of its imaging plane by one pixel distance, and the third brightness and chromaticity measurement is performed by the imaging brightness colorimeter, and the third measurement value matrix can be obtained at this time. Finally, based on the three measurement value matrices, the principle that when the relative positions of a pixel of the display screen to be tested and a group of pixels of the photosensitive chip of the imaging brightness colorimeter imaged by it are the same, the difference of the brightness and chromaticity true values ​​between adjacent pixels is calculated to obtain the row difference matrix and the column difference matrix.

[0077] In some optional embodiments, the display screen to be tested is initially located at the first position, first moves to the second position along the X-axis direction, and then moves to the third position along the Y-axis direction. At this time, the column difference matrix is ​​obtained by subtracting the measurement values ​​obtained by measuring the same group of photosensitive chip pixels in the first measurement value matrix and the second measurement value matrix; the row difference matrix is ​​obtained by subtracting the measurement values ​​obtained by measuring the same group of photosensitive chip pixels in the second measurement value matrix and the third measurement value matrix.

[0078] In some other optional embodiments, the display screen to be tested is initially located at the first position, first moves to the second position along the Y-axis direction, and then moves to the third position along the X-axis direction. At this time, the row difference matrix is ​​obtained by subtracting the measurement values ​​obtained by measuring the same group of photosensitive chip pixels in the first measurement value matrix and the second measurement value matrix; the column difference matrix is ​​obtained by subtracting the measurement values ​​obtained by measuring the same group of photosensitive chip pixels in the second measurement value matrix and the third measurement value matrix.

[0079] When moving along the X-axis direction, it can move to the right or to the left; when moving along the Y-axis direction, it can move upward or downward.

[0080] In other optional embodiments, the display screen to be measured is initially located at the second position for the first measurement, first moved along the X-axis direction or the Y-axis direction to the first position for the second measurement, then moved back to the second position, and then moved along the Y-axis direction or the X-axis direction to the third position for the third measurement. At this time, the column difference matrix or the row difference matrix can be calculated based on the first measurement value matrix and the second measurement value matrix, and the row difference matrix or the column difference matrix can be calculated based on the first measurement value matrix and the third measurement value matrix.

[0081] In this embodiment, the first brightness and chromaticity measurement of the display screen to be tested is performed. Figure 5 As shown, the first measurement value matrix L1 obtained is:

[0082]

[0083] L 1(i,j) =L 1real(i,j) +E ([i],[j])

[0084] Wherein, (i, j) represents the coordinates of the pixel at the i-th row and j-th column of the display screen to be tested; [i], [j] represent the CMOS pixel group at the i-th row and j-th column of the imaging brightness colorimeter; i = 1, 2, ..., m; j = 1, 2, ..., n; m and n are the number of rows and columns of the pixels of the display screen to be tested, respectively; L1 represents the first measurement value, L 1(i,j) That is, it represents the first measurement value of the pixel in the i-th row and j-th column of the display screen to be tested; L 1real Represents the true value of the first measurement, L 1real(i,j) That is, it represents the true value of the first measurement value of the pixel in the i-th row and j-th column of the display screen to be tested, E represents the measurement error related to the measurement position and the viewing angle of the display screen, and E ([i],[j]) That is, it represents the measurement error of the pixel group in the i-th row and j-th column in the imaging brightness colorimeter.

[0085] In this embodiment, the pixel brightness chromaticity measurement value is expressed as: pixel brightness chromaticity measurement value = pixel brightness chromaticity true value + brightness chromaticity error value, which is consistent with the conventional representation method, has small calculation amount, high calculation accuracy and convenient programming.

[0086] Then move the display screen to be tested rightward by one pixel along the X-axis direction and perform a second brightness and chromaticity measurement. Figure 6 As shown, the obtained second measurement value matrix L2 is:

[0087]

[0088] L 2(i,j)=L 2real(i,j) +E ([o],[j+1])

[0089] Among them, L 2(i,j) It represents the second measured value of the pixel in the i-th row and j-th column of the display screen to be tested, L 2real(i,j) It represents the true value of the second measurement value of the pixel in the i-th row and j-th column of the display screen to be tested, E ([i],[j+1]) Represents the measurement error of the pixel group in the i-th row and j+1-th column in the imaging brightness colorimeter.

[0090] Then move the display screen to be tested down one pixel along the Y axis and perform the third brightness and chromaticity measurement. Figure 7 As shown, the third measurement value matrix L3 obtained is:

[0091]

[0092] L 3(i,j) =L 3real(i,j) +E ([i+1],[j+1])

[0093] Among them, L 3(i,j) It represents the third measurement value of the pixel in the i-th row and j-th column of the display screen to be tested, L 3real(i,j) It represents the true value of the third measurement of the pixel in the i-th row and j-th column of the display screen to be tested, E ([i+1],[j+1]) Represents the measurement error of the pixel group in the i+1th row and j+1th column in the imaging brightness colorimeter.

[0094] Then, the measurement error E of the pixel group in the i-th row and j+1-th column in the imaging brightness colorimeter can be eliminated by subtracting the j-th column in the second measurement value matrix L2 from the j-th column in the first measurement value matrix L1. ([i],[j+1]) , we get the matrix of the difference between the true values ​​of adjacent column pixels (i.e., the column difference matrix C diff , containing m rows and n-1 columns):

[0095]

[0096] C diff (i,j)=L 1(i,j+1) -L 2(i,j) =L 1real(i,j+1) -L 2real(i,j)

[0097] The measurement error E of the pixel group in the i+1th row and j+1th column in the imaging brightness colorimeter can be eliminated by subtracting the i+1th row in the second measurement value matrix L2 from the i-th row in the third measurement value matrix L3. ([i+1],[j+1]) , we get the matrix of the difference between the true values ​​of pixels in adjacent rows (i.e., the row difference matrix R diff , containing m-1 rows and n columns):

[0098]

[0099] R diff (i,j)=L 2(i+1,j) -K 3(i,j) =L 2real(i+1,j) -L 3real(i,j)

[0100] S2: Divide the display screen to be tested into regions to obtain at least one sub-region.

[0101] Since the display screen area is generally large, the imaging brightness colorimeter has different test viewing angles for different areas. When the viewing angle difference is large, a large measurement error will occur, such as Figure 8 shown.

[0102] Therefore, according to the size of the display screen to be tested, it is divided into several sub-areas, such as Fig. 9 As shown, Fig. 9 The display screen is divided into 12 sub-areas with 3 rows and 4 columns. In each sub-area, the viewing angle difference of the imaging brightness colorimeter relative to each pixel is small, so the measurement accuracy can be improved.

[0103] S3: Determine a reference pixel in each sub-region respectively, and obtain the brightness and chromaticity standard value of each reference pixel by measuring with a second measuring device.

[0104] A pixel is selected as a reference pixel in each sub-region. The relative positions of the reference pixels in each sub-region can be the same or different. Fig.10 As shown in , the pixel at the upper left corner of each sub-region is selected as the reference pixel. Fig.11 As shown, the central pixel of each sub-region is selected as the reference pixel. In other embodiments, some sub-regions may select the upper left corner pixel as the reference pixel, and other sub-regions may select the central pixel as the reference pixel.

[0105] In this embodiment, the second measuring device is a plotting point spectrometer, and the brightness and chromaticity standard value of each reference pixel is measured by the plotting point spectrometer.

[0106] S4: Calculate the standard brightness and chromaticity value of each pixel in each sub-region according to the standard brightness and chromaticity value of the reference pixel in each sub-region and the row difference matrix and the column difference matrix.

[0107] Specifically, according to the position of a sub-region in the display screen to be tested, the sub-row difference matrix and sub-column difference matrix corresponding to the sub-region can be obtained from the row difference matrix and the column difference matrix; then, according to the brightness and chromaticity standard value of the reference pixel in the sub-region and its corresponding sub-row difference matrix and sub-column difference matrix, the brightness and chromaticity standard value of each pixel in the sub-region is calculated. By calculating the brightness and chromaticity standard values ​​of each pixel in all sub-regions, the brightness and chromaticity standard values ​​of all pixels in the display screen to be tested can be obtained.

[0108] For example, assuming that the size of the first sub-area of ​​the display screen to be tested (i.e., the sub-area located at the upper left corner of the display screen to be tested) is m1×n1, i.e., the range is from row 1 to row m1 and column 1 to column n1, then its corresponding sub-column difference matrix C diff1 and the subrow difference matrix R diff1 They are:

[0109]

[0110]

[0111] Assuming that the reference pixel of the sub-region is the pixel in its upper left corner (i.e., the pixel in the first row and first column of the sub-region), the standard value of brightness and chromaticity measured by the plotting spectrometer is L std(1,1) , then the brightness and chromaticity standard value L of the reference pixel std(1,1) Add the sub-column difference matrix C corresponding to the sub-region diff1 The value C in row 1 and column 1 diff (1,1), the standard value of brightness and chromaticity L of the pixel in the first row and second column of the sub-area can be calculated std(1,2) , and then L std(1,2) Add the sub-column difference matrix C corresponding to the sub-region diff1 The value C in row 1 and column 2 diff (1,2), the standard value of brightness and chromaticity L of the pixel in the first row and third column of the sub-area can be calculated std(1,3) ; Similarly, the brightness and chromaticity standard values ​​of each pixel in the first row of the sub-area can be calculated in sequence:

[0112] [L std(1,1) L std(1,2) … L std(1,j) … L std(1,n1) ]

[0113] Among them, L std(1,j) =L std(1,j-1) +C diff (1,j-1), j=2,3,...,n1.

[0114] Similarly, the brightness and chromaticity standard value L of the pixel in the first row and the jth column of the sub-area is std(1,j) Add the sub-row difference matrix R corresponding to the sub-regiondiff1 The value R in row 1, column j diff (1,j), the standard value of brightness and chromaticity L of the pixel in the second row and the jth column of the sub-area can be calculated std(2,j) , and then L std(2,j) Add the sub-row difference matrix R corresponding to the sub-region diff1 The value R in the 2nd row and jth column diff (2,j), the standard value of brightness and chromaticity L of the pixel in the 3rd row and jth column of the sub-area can be calculated std(3,j) ; Similarly, the brightness and chromaticity standard values ​​of each pixel in the sub-region can be calculated in sequence to obtain the brightness and chromaticity standard value matrix L of the sub-region std1 :

[0115]

[0116] Among them, L std(i,j) =L std(i-1,j) +R diff (i-1,j), i=2,3,…,m1, j=1,2,…,n1.

[0117] By using the above method, the brightness and chromaticity standard value matrices of all sub-areas can be calculated, and by combining the brightness and chromaticity standard value matrices of all sub-areas together, the brightness and chromaticity standard value of each pixel in the entire display screen to be tested can be obtained.

[0118] This embodiment uses the principle that when the relative positions of the display screen pixels and the imaging brightness colorimeter photosensitive chip pixel group are the same, the brightness chromaticity value measurement errors are the same, and obtains the difference in brightness chromaticity true values ​​between all adjacent pixels through the "row difference matrix" and "column difference matrix". Due to the introduction of the "row difference matrix" and "column difference matrix", when the brightness chromaticity values ​​of two adjacent pixels are very close or even equal (the difference is 0), no calculation error will be caused.

[0119] By dividing the display screen to be tested into multiple sub-areas, the measurement error caused by different viewing angles when the imaging brightness colorimeter measures different areas of the display screen can be eliminated. The display screen to be tested is divided into several sub-areas according to the size of the display screen to be tested, the measurement distance of the imaging brightness colorimeter and other parameters. One reference pixel is set in each sub-area, and the brightness and chromaticity value of the reference pixel is measured using a point-tracing spectrometer as the standard value. Then, the brightness and chromaticity standard values ​​of all pixels in each sub-area are calculated by combining the "row difference matrix" and "column difference matrix" of each sub-area (the accuracy is equivalent to that of a point-tracing spectrometer). When all sub-areas are calculated, the calculation results are combined to obtain the brightness and chromaticity standard values ​​of all pixels on the entire display screen to be tested, thereby achieving efficient and high-precision measurement of pixel-level brightness and chromaticity parameters.

[0120] Embodiment 2

[0121] Please refer to Figure 2 The second embodiment of the present invention is: a device for measuring the brightness and chromaticity of pixels on an optoelectronic display screen, which can execute the method for measuring the brightness and chromaticity of pixels on an optoelectronic display screen provided in the first embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method. The device can be implemented by software and / or hardware, specifically including:

[0122] A first measuring module 201 is used to measure the brightness and chromaticity of the display screen to be measured by a first measuring device when the display screen to be measured is located at a first position, a second position, and a third position, respectively, to obtain three measurement value matrices, and to calculate a row difference matrix and a column difference matrix according to the three measurement value matrices, wherein the first position and the second position are one pixel apart in a direction of one coordinate axis of an imaging plane of the display screen to be measured, and the second position and the third position are one pixel apart in a direction of another coordinate axis of the imaging plane of the display screen to be measured;

[0123] A second measuring module 202 is used to determine a reference pixel in the display screen to be tested, and obtain a brightness and chromaticity standard value of the reference pixel by measuring with a second measuring device;

[0124] The calculation module 203 is used to calculate the brightness and chromaticity standard value of each pixel in the display screen to be tested according to the brightness and chromaticity standard value of the reference pixel and the row difference matrix and the column difference matrix.

[0125] The measuring efficiency of the first measuring device is greater than the measuring efficiency of the second measuring device, and the measuring accuracy of the second measuring device is higher than the measuring accuracy of the first measuring device.

[0126] In an optional implementation, the first measurement module 201 includes:

[0127] A first measuring unit, configured to perform a first brightness and chromaticity measurement of the display screen to be measured by using a first measuring device to obtain a first measurement value matrix;

[0128] The second measuring unit is used to move the display screen to be tested along a coordinate axis of its imaging plane by a pixel distance, and then perform a second brightness and chromaticity measurement on the display screen to be tested through the first measuring device to obtain a second measurement value matrix;

[0129] A third measuring unit is used to move the display screen to be tested along another coordinate axis of its imaging plane by a pixel distance, and then perform a third brightness and chromaticity measurement on the display screen to be tested through the first measuring device to obtain a third measurement value matrix;

[0130] The first calculation unit is used to calculate a row difference matrix and a column difference matrix according to the first measurement value matrix, the second measurement value matrix and the third measurement value matrix.

[0131] In an optional implementation, the second measurement module 202 includes:

[0132] A division unit, used for dividing the display screen to be tested into regions to obtain at least one sub-region;

[0133] A fourth measuring unit, used to determine a reference pixel in each sub-area, and obtain a brightness and chromaticity standard value of each reference pixel by measuring with a second measuring device;

[0134] The calculation module 203 is specifically used to calculate the brightness and chromaticity standard value of each pixel in each sub-region according to the brightness and chromaticity standard value of the reference pixel in each sub-region and the row difference matrix and the column difference matrix.

[0135] In an optional implementation, the calculation module 203 includes:

[0136] A determination unit, used to determine a sub-row difference matrix and a sub-column difference matrix corresponding to each sub-region;

[0137] The second calculation unit is used to calculate the brightness and chromaticity standard value of each pixel in the sub-region according to the brightness and chromaticity standard value of the reference pixel in the sub-region and the sub-row difference matrix and sub-column difference matrix corresponding to the sub-region.

[0138] Embodiment 3

[0139] Please refer to Figure 3 , Embodiment 3 of the present invention is: an electronic device, the electronic device comprising:

[0140] One or more processors 301;

[0141] Storage device 302, used to store one or more programs;

[0142] When the one or more programs are executed by the one or more processors 301, the one or more processors 301 implement the various processes in the embodiment of the method for measuring the brightness and chromaticity of pixels of the optoelectronic display screen as described above, and can achieve the same technical effect. To avoid repetition, they are not repeated here.

[0143] Embodiment 4

[0144] Embodiment 4 of the present invention provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the various processes in the embodiment of the method for measuring the brightness and chromaticity of pixels of an optoelectronic display screen as described above are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0145] In summary, the present invention provides a method, device, equipment and storage medium for measuring the brightness and chromaticity of pixels of an optoelectronic display screen. By dividing the display screen to be measured into multiple sub-areas, the measurement error caused by different viewing angles when an imaging brightness colorimeter measures different areas of the display screen; by using an imaging brightness colorimeter to measure the display screen to be measured three times, using a plotting spectrometer to measure a number of reference pixels, and using the measured values ​​of the plotting spectrometer as standard values, high-precision brightness and chromaticity values ​​of all pixels of the display screen to be measured can be obtained by a pixel spacing displacement difference elimination method. Compared with the measured values ​​(standard values) of the plotting spectrometer, the brightness measurement error is controlled within ±3%, and the chromaticity coordinate measurement deviation is controlled within ±0.003. While ensuring high measurement efficiency, high-precision measurement of pixel-level brightness and chromaticity parameters is achieved.

[0146] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented with the help of software and necessary hardware. Based on such an understanding, the technical solution of the present invention can be essentially or partly contributed to the prior art in the form of a software product, which can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk or optical disk, etc., including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0147] It is worth noting that in the embodiment of the above-mentioned device, the various units and modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention.

[0148] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for measuring the brightness and chromaticity of pixels of an optoelectronic display screen, characterized in that: include: When the display screen to be tested is located at a first position, a second position, and a third position, respectively, the brightness and chromaticity of the display screen to be tested are measured by a first measuring device to obtain three measurement value matrices, and a row difference matrix and a column difference matrix are calculated according to the three measurement value matrices, wherein the first position and the second position are one pixel apart in a direction of one coordinate axis of an imaging plane of the display screen to be tested, and the second position and the third position are one pixel apart in a direction of another coordinate axis of the imaging plane of the display screen to be tested; Determine a reference pixel in the display screen to be tested, and obtain the brightness and chromaticity standard value of the reference pixel by measuring with a second measuring device; The brightness and chromaticity standard values ​​of each pixel in the display screen to be tested are calculated based on the brightness and chromaticity standard values ​​of the reference pixels and the row difference matrix and the column difference matrix.

2. The method for measuring the brightness and chromaticity of a photoelectric display screen pixel according to claim 1, characterized in that: The method comprises: measuring the brightness and chromaticity of the display screen to be tested by using a first measuring device when the display screen to be tested is located at a first position, a second position, and a third position, respectively, to obtain three measurement value matrices, and calculating a row difference matrix and a column difference matrix according to the three measurement value matrices, including: Performing a first brightness and chromaticity measurement of the display screen to be measured by a first measuring device to obtain a first measurement value matrix; After the display screen to be tested is moved along a coordinate axis of its imaging plane by a pixel distance, the brightness and chromaticity of the display screen to be tested is measured for the second time by the first measuring device to obtain a second measurement value matrix; After the display screen to be tested is moved along another coordinate axis of its imaging plane by a pixel distance, the brightness and chromaticity of the display screen to be tested is measured for the third time by the first measuring device to obtain a third measurement value matrix; A row difference matrix and a column difference matrix are calculated according to the first measurement value matrix, the second measurement value matrix and the third measurement value matrix.

3. The method for measuring the brightness and chromaticity of a photoelectric display screen pixel according to claim 2, characterized in that: When the one coordinate axis is the X-axis and the other coordinate axis is the Y-axis, the measurement values ​​measured by the same photosensitive chip pixel group of the first measuring device in the first measurement value matrix and the second measurement value matrix are subtracted to obtain a column difference matrix, and the measurement values ​​measured by the same photosensitive chip pixel group of the first measuring device in the second measurement value matrix and the third measurement value matrix are subtracted to obtain a row difference matrix; When the one coordinate axis is the Y axis and the other coordinate axis is the X axis, the measurement values ​​obtained by measuring the same photosensitive chip pixel group of the first measuring device in the first measurement value matrix and the second measurement value matrix are subtracted to obtain a row difference matrix, and the measurement values ​​obtained by measuring the same photosensitive chip pixel group of the first measuring device in the second measurement value matrix and the third measurement value matrix are subtracted to obtain a column difference matrix.

4. The method for measuring the brightness and chromaticity of a photoelectric display screen pixel according to claim 1, characterized in that: Determining a reference pixel in the display screen to be tested, and measuring the brightness and chromaticity standard value of the reference pixel by a second measuring device; The brightness and chromaticity standard values ​​of each pixel in the display screen to be tested are calculated according to the brightness and chromaticity standard values ​​of the reference pixels and the row difference matrix and the column difference matrix, including: Divide the display screen to be tested into regions to obtain at least one sub-region; Determine a reference pixel in each sub-area, and obtain the brightness and chromaticity standard value of each reference pixel by measuring with a second measuring device; The standard brightness and chromaticity values ​​of each pixel in each sub-region are calculated according to the standard brightness and chromaticity values ​​of the reference pixels in each sub-region and the row difference matrix and the column difference matrix.

5. The method for measuring the brightness and chromaticity of a photoelectric display screen pixel according to claim 4, characterized in that: The step of calculating the brightness and chromaticity standard value of each pixel in each sub-region according to the brightness and chromaticity standard value of the reference pixel in each sub-region and the row difference matrix and the column difference matrix comprises: Determine the sub-row difference matrix and the sub-column difference matrix corresponding to each sub-region; The brightness and chromaticity standard values ​​of each pixel in a sub-region are calculated according to the brightness and chromaticity standard values ​​of the reference pixels in the sub-region and the sub-row difference matrix and the sub-column difference matrix corresponding to the sub-region.

6. The method for measuring the brightness and chromaticity of a photoelectric display screen pixel according to any one of claims 1 to 5, characterized in that: The measurement efficiency of the first measuring device is greater than the measurement efficiency of the second measuring device, and the measurement accuracy of the second measuring device is higher than the measurement accuracy of the first measuring device.

7. The method for measuring the brightness and chromaticity of a photoelectric display screen pixel according to any one of claims 1 to 5, characterized in that: The first measuring device is an imaging brightness colorimeter, and the second measuring device is a plotting spectrometer.

8. A device for measuring the brightness and chromaticity of pixels of an optoelectronic display screen, characterized in that: include: A first measuring module is used to measure the brightness and chromaticity of the display screen to be measured by a first measuring device when the display screen to be measured is located at a first position, a second position, and a third position, respectively, to obtain three measurement value matrices, and to calculate a row difference matrix and a column difference matrix according to the three measurement value matrices, wherein the first position and the second position are one pixel apart in a direction of one coordinate axis of an imaging plane of the display screen to be measured, and the second position and the third position are one pixel apart in a direction of another coordinate axis of the imaging plane of the display screen to be measured; A second measuring module is used to determine a reference pixel in the display screen to be tested, and obtain a brightness and chromaticity standard value of the reference pixel by measuring with a second measuring device; The calculation module is used to calculate the brightness and chromaticity standard value of each pixel in the display screen to be tested according to the brightness and chromaticity standard value of the reference pixel and the row difference matrix and the column difference matrix.

9. An electronic device, characterized in that: The electronic device comprises: one or more processors; A storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method for measuring the brightness and chromaticity of pixels of an optoelectronic display screen as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for measuring the brightness and chromaticity of pixels of an optoelectronic display screen as described in any one of claims 1 to 7 are implemented.

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