Method, device, equipment and storage medium for measuring pixel brightness and chromaticity of photoelectric display screen

Abstract

The present invention discloses a method, device, equipment, and storage medium for measuring the brightness and chromaticity of pixels on a photoelectric display screen. The method comprises: measuring the brightness and chromaticity of the display screen to be measured using a first measuring device when the display screen to be measured is in 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 based on the three measurement value matrices, wherein the first position and the second position are one pixel apart 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 one pixel apart in the direction of another coordinate axis; determining a reference pixel in the display screen to be measured, and measuring the brightness and chromaticity standard value of the reference pixel using a second measuring device; and calculating the brightness and chromaticity standard value of each pixel in the display screen to be measured based on the brightness and chromaticity standard value of the reference pixel and the row difference matrix and the column difference matrix. The present invention can achieve efficient and high-precision measurement of pixel-level brightness and chromaticity of a photoelectric display screen.

Description

Technical Field

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

[0002] Accurately measuring the luminance and chromaticity (hereinafter referred to as brightness and chromaticity) of pixels on optoelectronic display screens (hereinafter referred to as displays) is crucial for improving display quality and manufacturing processes. Pixel-level brightness and chromaticity measurements on displays are typically performed using a spot spectrometer or an imaging brightness colorimeter.

[0003] The point-tracing 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 can only measure one pixel at a time, positioning and focusing are extremely difficult, and the test efficiency is extremely low.

[0004] Imaging colorimeters use CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) sensor imaging to measure the brightness and chromaticity parameters of all pixels within a large display screen area at once (imaging colorimeters offer pixel resolutions ranging from 61 million to 151 million). The measurement process is simple and highly efficient, but accuracy is relatively low (the claimed brightness accuracy is ±3% and the chromaticity coordinate deviation is ±0.003, but this applies to measurements of uniform surface light sources. When actually measuring pixel-level brightness and chromaticity on a display screen, due to the presence of non-luminous areas between pixels and the potentially large variations in brightness and chromaticity values ​​of individual pixels, the actual pixel brightness measurement accuracy is only ±12%, with a chromaticity coordinate deviation of ±0.007).

[0005] In the paper "Research on Pixel-Level Precision Acquisition and Correction Technology for Ultra-High-Density LED Displays," a pixel shift compensation method is proposed to correct optical acquisition and transfer errors in LED displays. This method shifts the camera position to achieve relative movement of display pixels within the imaged pixel, allowing different display pixels to overlap within the same pixel. To correct for optical transfer errors, this method exploits the fact that optical transfer errors are identical for different pixels within the same area of ​​the camera image. The three independent, complete sets of pixel brightness and color information acquired by the camera through time-sharing and shifting coincide with the fact that the three sets of brightness and color information acquired within the same area belong to different pixels. Therefore, using these three sets of pixel brightness and color information as variables, a linear difference equation is established for each area to derive the true brightness and color ratio coefficient between adjacent display pixels. This ratio coefficient is then multiplied by the average brightness and color value of all pixels measured by the camera to obtain the true brightness and color value of each pixel.

[0006] However, the above method cannot obtain the true brightness and chromaticity values ​​of each pixel. While the above method can indeed obtain a series of true brightness and chromaticity ratio coefficients between each pixel, multiplying these ratio coefficients by the average brightness and chromaticity values ​​of all pixels measured by the camera does not yield the true brightness and chromaticity values ​​of each pixel. Instead, it only yields relative brightness and chromaticity values ​​of each pixel that have eliminated some optical acquisition transmission errors.

[0007] Furthermore, the formula for calculating the proportionality coefficient in the above method is: proportionality coefficient = difference in the brightness and chromaticity values ​​of two adjacent pixels / sum of the brightness and chromaticity values ​​of the 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 significant errors in subsequent calculations. Furthermore, the pixel brightness and chromaticity measurement value in 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 multiplication, this method results in large computational complexity, large errors, 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 a photoelectric display screen, which can realize efficient and high-precision measurement of the brightness and chromaticity of pixels at the photoelectric 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, luminance and chromaticity measurements are performed on the display screen to be tested using a first measuring device to obtain three measurement value matrices, and a row difference matrix and a column difference matrix are calculated based on the three measurement value matrices, wherein the first position and the second position are one pixel apart in the direction of one coordinate axis of the imaging plane of the display screen to be tested, and the second position and the third position are one pixel apart in the direction of another coordinate axis of the imaging plane of the display screen to be tested;

[0011] Determining a reference pixel in the display screen to be tested, and measuring the brightness and chromaticity standard values ​​of the reference pixel using 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 on a photoelectric display screen, comprising:

[0014] a first measurement module, configured to measure the luminance and chromaticity of the display screen to be measured using a first measurement 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 based on the three measurement value matrices, wherein the first position and the second position are one pixel apart in the 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 the 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 standard value of brightness and chromaticity of the reference pixel by measuring it 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, 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, which, when executed by a processor, implements the method for measuring the brightness and chromaticity of pixels of an optoelectronic display screen as provided in the first aspect.

[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 on the display screen to be measured three times, and using a second measuring device (such as a plotting 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 measured can be obtained through a pixel spacing displacement difference elimination method, thereby ensuring both high measurement efficiency and measurement accuracy, and realizing efficient and high-precision measurement of pixel-level brightness and chromaticity of photoelectric 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 structural diagram 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 structural diagram 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 a photoelectric display screen according to a first embodiment of the present invention;

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

[0030] Figure 8 Schematic diagram of the test viewing angle of different areas for the imaging brightness colorimeter;

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

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

[0033] Figure 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 with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0035] Before discussing the exemplary embodiments in more detail, it should be noted 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 can be performed in parallel, concurrently, or simultaneously. In addition, the order of the steps can be rearranged. A process can be terminated when its operation is completed, but can also have additional steps not included in the accompanying drawings. A process can correspond to a method, function, procedure, subroutine, sub-computer program, etc.

[0036] In addition, the terms "first", "second", etc. may be used in this document to describe various directions, actions, steps or elements, 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 this 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. should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of these 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 a photoelectric display screen includes:

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

[0039] Determining a reference pixel in the display screen to be tested, and measuring the brightness and chromaticity standard values ​​of the reference pixel using 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 optoelectronic display screens can be achieved.

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

[0043] Performing a first luminance 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 distance of one pixel, the brightness and chromaticity of the display screen to be tested are 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 one pixel distance along the coordinate axis, adjacent pixels are measured by the same group of pixels in the measuring device in the previous and subsequent measurements. By calculating the difference between the two measurement values, the measurement error of the same group of pixels can be eliminated, 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, determining a reference pixel in the display screen to be tested and measuring the reference pixel by a second measuring device to obtain a standard brightness and chromaticity value; and calculating the standard brightness and chromaticity value of each pixel in the display screen to be tested based on the standard brightness and chromaticity value of the reference pixel and the row difference matrix and the column difference matrix, includes:

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

[0052] Determining a reference pixel in each sub-region, and measuring the brightness and chromaticity standard value of each reference pixel using 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, calculating the standard brightness and chromaticity values ​​of each pixel in each subregion based on the standard brightness and chromaticity values ​​of the reference pixels in each subregion and the row difference matrix and the column difference matrix includes:

[0055] Determine the sub-row difference matrix and 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 multiple sub-areas, measurement errors 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 colorimeter, and the second measuring device is a spot spectrometer.

[0060] From the above description, it can be seen that using an imaging colorimeter with high measurement efficiency to measure all pixels and using a plotting 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 measurement module 201 is configured to measure the luminance and chromaticity of the display screen to be measured using a first measurement 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 based on the three measurement value matrices, wherein the first position and the second position are one pixel apart 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 one pixel apart in the direction of another coordinate axis of the imaging plane of the display screen to be measured;

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

[0064] The calculation module 203 is configured to calculate the standard brightness and chromaticity values ​​of each pixel in the display screen to be tested according to the standard brightness and chromaticity values ​​of the reference pixels 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, for storing 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 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] Example 1

[0071] Please refer to Figure 4-11 The first embodiment of the present invention is: a method for measuring the brightness and chromaticity of pixels of a photoelectric display screen, which can be applied to measure the brightness and chromaticity of pixels of a photoelectric 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 measured is located at a first position, a second position, and a third position, respectively, the brightness and chromaticity of the display screen to be measured 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 based on the three measurement value matrices.

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

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

[0076] Specifically, the imaging luminance colorimeter first measures the luminance and chromaticity of the display screen to be tested, resulting in a first measurement value matrix. The display screen to be tested is then moved one pixel along one coordinate axis of its imaging plane, and a second luminance and chromaticity measurement is performed using the imaging luminance colorimeter, resulting in a second measurement value matrix. The display screen to be tested is then moved one pixel along another coordinate axis of its imaging plane, and a third luminance and chromaticity measurement is performed using the imaging luminance colorimeter, resulting in a third measurement value matrix. Finally, based on these three measurement value matrices, and utilizing the principle that measurement errors are identical when a pixel of the display screen to be tested and a group of pixels of the imaging luminance colorimeter's photosensitive chip are in the same relative position, the differences in luminance and chromaticity true values ​​between adjacent pixels are calculated, resulting in row and column difference matrices.

[0077] In some optional embodiments, the display screen to be tested is initially located at a first position, first moved along the X-axis to a second position, and then moved along the Y-axis to a third position. At this point, a 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 from the second measurement value matrix; and a 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 from the third measurement value matrix.

[0078] In other optional embodiments, the display screen to be tested is initially located at a first position, first moved along the Y-axis to a second position, and then moved along the X-axis to a third position. In this case, a 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 from the second measurement value matrix; and a 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 from the third measurement value matrix.

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

[0080] In other optional embodiments, the display screen to be measured is initially located at the second position for a first measurement, is first moved along the X-axis or Y-axis direction to the first position for a second measurement, then moved back to the second position and then moved along the Y-axis or X-axis direction to a third position for a third measurement. In this case, a column difference matrix or a row difference matrix can be calculated based on the first measurement value matrix and the second measurement value matrix, and a row difference matrix or a 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, such as 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] Where (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 colorimeter; i = 1, 2, ..., m; j = 1, 2, ..., n; m and n are the number of rows and columns of 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 Indicates 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 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 is convenient for programming.

[0086] Then move the display screen to be tested rightward by one pixel along the X-axis and perform the 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 ([i],[j+1])

[0089] Among them, L 2(i,j) It represents the second measurement value of the pixel in row i and column j 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 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 row i and column j 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 at row i+1 and column j+1 in the imaging colorimeter.

[0094] Then, the measurement error E of the pixel group at row i and column j+1 in the imaging colorimeter can be eliminated by subtracting the jth column in the second measurement matrix L2 from the jth column in the first measurement matrix L1. ([i],[j+1]) , get the matrix of the difference between the true values ​​of adjacent column pixels (i.e. 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 of the imaging colorimeter can be eliminated by subtracting the i+1th row of the second measurement value matrix L2 from the i-th row of the third measurement value matrix L3. ([i+1],[j+1]) , get the matrix of the difference between the true values ​​of adjacent row pixels (i.e. row difference matrix R diff , containing m-1 rows and n columns):

[0098]

[0099] R diff (i,j)=L 2(i+1,j) -L 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, it will produce large measurement errors, 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 Figure 9 As shown, Figure 9 In the example, the display screen is divided into 12 sub-areas, each with 3 rows and 4 columns. Within each sub-area, the viewing angle of the imaging colorimeter relative to each pixel is relatively small, thereby improving measurement accuracy.

[0103] S3: Determine a reference pixel in each sub-region, 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. For example, Figure 10 As shown in , the pixel at the upper left corner of each sub-region is selected as the reference pixel. Figure 11 As shown, the central pixel of each sub-region is selected as the reference pixel. In other embodiments, the upper left corner pixel of some sub-regions may be selected as the reference pixel, and the central pixel of other sub-regions may be selected as the reference pixel.

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

[0106] S4: Calculating the standard brightness and chromaticity values ​​of each pixel in each sub-region 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.

[0107] Specifically, based on 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 column difference matrix. Then, based on the brightness and chromaticity standard values ​​of the reference pixels in the sub-region and their corresponding sub-row difference matrix and sub-column difference matrix, the brightness and chromaticity standard values ​​of each pixel in the sub-region are 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 in 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 the corresponding sub-column difference matrix C is diff1 Sum 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 point-tracing 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 brightness and chromaticity standard value 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-region can be calculated in sequence:

[0112]

[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 1st row and the jth column of the sub-area is std(1,j) Add the sub-row difference matrix R corresponding to the sub-region diff1 The value R in row 1, column j diff(1, j), the brightness and chromaticity standard value L of the pixel in the 2nd row and 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 row 2, column j diff (2, j), the brightness and chromaticity standard value 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. By combining the brightness and chromaticity standard value matrices of all sub-areas together, the brightness and chromaticity standard values ​​of each pixel in the entire display screen to be tested can be obtained.

[0118] This embodiment utilizes the principle that when the relative positions of display screen pixels and the image sensor chip pixel group of the imaging luminance colorimeter are the same, the measurement errors of luminance and chromaticity values ​​are the same. Using a "row difference matrix" and a "column difference matrix," the differences in the true luminance and chromaticity values ​​between all adjacent pixels are calculated. Due to the introduction of these matrices, even when the luminance and chromaticity values ​​of two adjacent pixels are very close or even equal (the difference is zero), no calculation errors are caused.

[0119] By dividing the display screen to be tested into multiple sub-areas, the measurement errors caused by different viewing angles when using an imaging luminance colorimeter to measure different areas of the display can be eliminated. The display screen to be tested is divided into several sub-areas based on parameters such as the size of the display screen to be tested and the measurement distance of the imaging luminance colorimeter. A reference pixel is set in each sub-area, and the luminance and chromaticity values ​​of this reference pixel are measured using a point-drawing spectrometer as the standard value. The "row difference matrix" and "column difference matrix" of each sub-area are then combined to calculate the luminance and chromaticity standard values ​​for all pixels in each sub-area (with accuracy comparable to that of a point-drawing spectrometer). Once calculations are completed for all sub-areas, the results are combined to obtain the luminance and chromaticity standard values ​​for all pixels on the entire display screen to be tested, thus achieving efficient and high-precision measurement of pixel-level luminance and chromaticity parameters.

[0120] Example 2

[0121] Please refer to Figure 2The second embodiment of the present invention is a device for measuring the brightness and chromaticity of pixels on an optoelectronic display screen. The device 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. The device can be implemented by software and / or hardware and specifically includes:

[0122] A first measurement module 201 is configured to measure the luminance and chromaticity of the display screen to be measured using a first measurement 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 based on the three measurement value matrices, wherein the first position and the second position are one pixel apart 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 one pixel apart in the direction of another coordinate axis of the imaging plane of the display screen to be measured;

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

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

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

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

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

[0128] The second measuring unit is configured to move the display screen to be measured by a distance of one pixel along a coordinate axis of the imaging plane thereof, and then perform a second luminance and chromaticity measurement of the display screen to be measured by the first measuring device to obtain a second measurement value matrix;

[0129] a third measuring unit, configured to move the display screen to be measured by a distance of one pixel along another coordinate axis of the imaging plane, and then perform a third luminance and chromaticity measurement of the display screen to be measured using the first measuring device to obtain a third measurement value matrix;

[0130] The first calculation unit is configured 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 embodiment, the second measurement module 202 includes:

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

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

[0134] The calculation module 203 is specifically configured to calculate the standard brightness and chromaticity values ​​of each pixel in each sub-region 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.

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

[0136] a determination unit, configured 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 values ​​of each pixel in a sub-region according to the brightness and chromaticity standard values ​​of the reference pixels in the sub-region and the sub-row difference matrix and sub-column difference matrix corresponding to the sub-region.

[0138] Example 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, for storing 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 on a photoelectric display screen as described above, and can achieve the same technical effect. To avoid repetition, they are not described here.

[0143] Example 4

[0144] Embodiment 4 of the present invention provides a computer-readable storage medium having a computer program stored thereon. 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 described above are implemented, and the same technical effects can be achieved. To avoid repetition, these are not described here.

[0145] In summary, the present invention provides a method, device, equipment, and storage medium for measuring the brightness and chromaticity of pixels on a photoelectric 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. The display screen to be measured is measured three times using an imaging brightness colorimeter, and a plurality of reference pixels are measured using a plotting spectrometer. The measured values ​​of the plotting spectrometer are used as standard values. By using a pixel pitch displacement difference elimination method, high-precision brightness and chromaticity values ​​of all pixels of the display screen to be measured can be obtained. 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, those skilled in the art can clearly understand that the present invention can be implemented with the help of software and necessary hardware. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied 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 a number of instructions for enabling 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 description 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 on a photoelectric 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, luminance and chromaticity measurements are performed on the display screen to be tested using a first measuring device to obtain three measurement value matrices, and a row difference matrix and a column difference matrix are calculated based on the three measurement value matrices, wherein the first position and the second position are one pixel apart in the direction of one coordinate axis of the imaging plane of the display screen to be tested, and the second position and the third position are one pixel apart in the direction of another coordinate axis of the imaging plane of the display screen to be tested; Determining a reference pixel in the display screen to be tested, and measuring the brightness and chromaticity standard values ​​of the reference pixel using 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, wherein: The method comprises: measuring 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 calculating a row difference matrix and a column difference matrix based on the three measurement value matrices, including: Performing a first luminance 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 distance of one pixel, the brightness and chromaticity of the display screen to be tested are 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, wherein: When the one coordinate axis is the X-axis and the other coordinate axis is the Y-axis, the measurement values ​​in the first measurement value matrix and the second measurement value matrix, which are measured by the same photosensitive chip pixel group of the first measurement device, are subtracted to obtain a column difference matrix, and the measurement values ​​in the second measurement value matrix and the third measurement value matrix, which are measured by the same photosensitive chip pixel group of the first measurement device, are subtracted to obtain a row difference matrix; 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 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, wherein: Determining a reference pixel in the display screen to be tested, and measuring the brightness and chromaticity standard values ​​of the reference pixel by a second measuring device; Calculating the brightness and chromaticity standard values ​​of each pixel in the display screen to be tested according to the brightness and chromaticity standard values ​​of the reference pixels and the row difference matrix and the column difference matrix includes: Divide the display screen to be tested into regions to obtain at least one sub-region; Determining a reference pixel in each sub-region, and measuring the brightness and chromaticity standard value of each reference pixel using 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 includes: Determine the sub-row difference matrix and 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 colorimeter, and the second measuring device is a point-drawing spectrometer.

8. A device for measuring the brightness and chromaticity of pixels of a photoelectric display screen, characterized in that: include: a first measurement module, configured to measure the luminance and chromaticity of the display screen to be measured using a first measurement 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 based on the three measurement value matrices, wherein the first position and the second position are one pixel apart in the 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 the 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 standard value of brightness and chromaticity of the reference pixel by measuring it 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 on an optoelectronic display screen according to 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 are implemented.

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