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

Abstract

The invention discloses a photoelectric display screen pixel brightness and chrominance correction method, device and equipment and a storage medium, and the method comprises the steps: carrying out the region division of a to-be-detected display screen, obtaining at least one sub-region, and determining at least one reference pixel in each sub-region; measuring the brightness value of each pixel in the display screen to be measured through a first measuring device, and respectively calculating the average brightness value of the reference pixel of each sub-region; a standard brightness value of each reference pixel is measured through a second measuring device, and a standard brightness average value of the reference pixels of each sub-region is calculated; calculating a correction coefficient corresponding to each sub-region according to the brightness and chrominance average value and the standard brightness and chrominance average value of the reference pixels of each sub-region; and correcting the brightness value of each pixel in each sub-region according to the correction coefficient corresponding to each sub-region to obtain a brightness correction value of each pixel. 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 correcting pixel brightness and chromaticity of 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 optoelectronic display academic and industrial circles, imaging brightness colorimeter is the most commonly used instrument for measuring the brightness and chromaticity of display screens at the pixel level. In order to establish an accurate correspondence between the output current of the imaging brightness colorimeter CCD / CMOS image sensor and the brightness and chromaticity of the display screen being measured, a color analyzer is generally used to calibrate the imaging brightness colorimeter.

[0006] The working principle of color analyzer is as follows Figure 1 As shown, the light emitted by the sample under test enters the color analyzer, passes through the XYZ color filter fixed on the microsensor, obtains the XYZ tristimulus values ​​of the light under test, and then obtains the brightness and chromaticity information.

[0007] The working principle of the imaging colorimeter is as follows Figure 2As shown, similar to the color analyzer, the three stimulus values ​​of the measured light are also obtained through the XYZ filter. The main difference is that the filter of the imaging brightness colorimeter is installed on the rotating wheel, and a stimulus value data is collected every time the wheel rotates one position; while the XYZ filter of the color analyzer is fixed to the microsensor as a whole, and the collection of the three stimulus values ​​is completed at one time.

[0008] The specific process of calibrating the imaging brightness colorimeter with a color analyzer includes: 1. Using a standard spectroradiometer to measure the XYZ tristimulus values ​​of the standard white field instrument that display the RGB screen respectively as standard values; 2. Using a color analyzer to measure the XYZ tristimulus values ​​of the standard white field instrument that display the RGB screen respectively; 3. Input the standard values ​​of the standard spectroradiometer to calibrate the measured values ​​of the color analyzer; 4. Using a color analyzer to measure the XYZ tristimulus values ​​of the RGB screen displayed by the tested display screen respectively; 5. Input these tristimulus values ​​to complete the calibration of the imaging brightness colorimeter.

[0009] The steps of using a color analyzer to measure the XYZ tristimulus values ​​of the RGB images displayed by the tested display screen are as follows: 1. Light up the tested display screen to display the RGB images respectively; 2. Place the lens barrel of the color analyzer close to the center of the display screen and measure the XYZ tristimulus values ​​of the RGB images respectively. Figure 3 The figure shows the color analyzer measuring the R screen displayed on the display. The black circle in the figure represents the lens barrel of the color analyzer. The measured value is the average value of the three stimulus values ​​of the entire area within the black circle (including the luminous pixels and the non-luminous areas between the pixels).

[0010] However, the above method has the following disadvantages:

[0011] 1. Since the measurement accuracy of the imaging brightness colorimeter and color analyzer is mainly determined by the consistency of the light transmission characteristics of the XYZ tristimulus filter and the CIE color matching function, the measurement accuracy of these two types of instruments cannot be much different since they both use color filters. In addition, due to process and structural factors, rotating color filters are easier to achieve higher accuracy than fixed color filters. Therefore, using a color analyzer to calibrate the imaging brightness colorimeter cannot improve the measurement accuracy of the imaging brightness colorimeter.

[0012] 2. When the color analyzer calibrates the imaging brightness colorimeter, the standard value is the average brightness and chromaticity of the display screen in the circular area corresponding to the color analyzer lens barrel, which is quite different from the brightness and chromaticity of the pixel. The imaging brightness colorimeter is calibrated based on this standard value. When measuring the brightness and chromaticity values ​​at the pixel level, a certain measurement error will also occur.

[0013] 3. The process of calibrating the imaging brightness colorimeter with a color analyzer is relatively long. Error factors in multiple links are introduced during the calibration process, which reduces the measurement accuracy of the imaging brightness and chromaticity. The calibration error includes the measurement error of the standard spectroradiometer, the measurement error of the color analyzer, the instability error of the standard white field meter, and the instability error of the measured display screen. According to experimental tests, the imaging brightness colorimeter calibrated by the color analyzer measures the pixel-level brightness and chromaticity values ​​of the display screen. Compared with the standard measurement value using the standard spectroradiometer, the brightness measurement error reaches ±12% and the chromaticity coordinate deviation reaches ±0.007.

[0014] 4. The imaging brightness colorimeter is calibrated using the measurement value of the color analyzer at the center of the display screen, without considering the measurement error caused by different viewing angles when the imaging brightness colorimeter measures different areas of the display screen. Summary of the invention

[0015] The technical problem to be solved by the present invention is to provide a method, device, equipment and storage medium for correcting 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.

[0016] In a first aspect, the present invention provides a method for correcting the brightness and chromaticity of pixels in an optoelectronic display screen, comprising:

[0017] Dividing the display screen to be tested into regions to obtain at least one sub-region, and determining at least one reference pixel in each sub-region;

[0018] The brightness and chromaticity of the display screen to be tested are measured by a first measuring device to obtain the brightness and chromaticity value of each pixel in the display screen to be tested, and the average brightness and chromaticity value of the reference pixels in each sub-area is calculated respectively;

[0019] The second measuring device measures the brightness and chromaticity of the reference pixels in each sub-region to obtain standard brightness and chromaticity values ​​of the reference pixels, and calculates the standard brightness and chromaticity average values ​​of the reference pixels in each sub-region respectively;

[0020] Calculate the correction coefficient corresponding to each sub-region according to the average brightness and chromaticity of the reference pixels in each sub-region and the average brightness and chromaticity of the standard;

[0021] The brightness and chromaticity values ​​of each pixel in each sub-region are corrected according to the correction coefficients corresponding to each sub-region to obtain the brightness and chromaticity correction values ​​of each pixel.

[0022] In a second aspect, the present invention further provides a device for correcting pixel brightness and chromaticity of an optoelectronic display screen, comprising:

[0023] A division module, used for dividing the display screen to be tested into regions to obtain at least one sub-region, and determining at least one reference pixel in each sub-region;

[0024] A first calculation module is used to measure the brightness and chromaticity of the display screen to be tested by a first measuring device to obtain the brightness and chromaticity value of each pixel in the display screen to be tested, and to calculate the average brightness and chromaticity value of the reference pixels in each sub-area;

[0025] A second calculation module is used to measure the brightness and chromaticity of the reference pixels in each sub-region by a second measurement device to obtain standard brightness and chromaticity values ​​of the reference pixels, and respectively calculate the standard brightness and chromaticity average values ​​of the reference pixels in each sub-region;

[0026] A third calculation module is used to calculate the correction coefficient corresponding to each sub-region according to the average brightness and chromaticity of the reference pixels of each sub-region and the average brightness and chromaticity of the standard;

[0027] The correction module is used to correct the brightness and chromaticity values ​​of each pixel in each sub-region according to the correction coefficient corresponding to each sub-region, so as to obtain the brightness and chromaticity correction value of each pixel.

[0028] In a third aspect, the present invention further provides an electronic device, the electronic device comprising:

[0029] one or more processors;

[0030] A storage device for storing one or more programs;

[0031] When the one or more programs are executed by the one or more processors, the one or more processors implement the method provided in the first aspect.

[0032] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method provided in the first aspect.

[0033] The beneficial effects of the present invention are as follows: by dividing the display screen to be tested into multiple sub-areas, the measurement error caused by different viewing angles when an imaging brightness colorimeter measures different areas of the display screen can be eliminated; by measuring the brightness chromaticity value of the reference pixel and the standard brightness chromaticity value, a correction coefficient is calculated, and the brightness chromaticity value of each pixel is corrected based on the correction coefficient, so that high-precision brightness chromaticity values ​​of all pixels of the display screen to be tested can be obtained, which not only ensures high measurement efficiency but also ensures measurement accuracy, and realizes efficient and high-precision measurement of pixel-level brightness chromaticity of the optoelectronic display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the working principle of the color analyzer;

[0035] Figure 2 This is a schematic diagram of the working principle of the imaging brightness colorimeter;

[0036] Figure 3A schematic diagram of a display screen showing an R screen measured by a color analyzer;

[0037] Figure 4 A flowchart of a method for correcting pixel brightness and chromaticity of an optoelectronic display screen provided by the present invention;

[0038] Figure 5 A schematic diagram of the structure of a device for correcting pixel brightness and chromaticity of an optoelectronic display screen provided by the present invention;

[0039] Figure 6 A schematic diagram of the structure of an electronic device provided by the present invention;

[0040] Figure 7 This is a flow chart of a method for correcting pixel brightness and chromaticity of an optoelectronic display screen according to a first embodiment of the present invention;

[0041] Figure 8 This is a schematic diagram of the test viewing angle of different areas by the imaging brightness colorimeter;

[0042] Fig. 9 This is a schematic diagram of sub-area division according to the first embodiment of the present invention;

[0043] Fig.10 FIG. 1 is a schematic diagram of reference pixels in each sub-region according to the first embodiment of the present invention. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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.

[0047] like Figure 4 As shown, a method for correcting pixel brightness and chromaticity of an optoelectronic display screen comprises:

[0048] Dividing the display screen to be tested into regions to obtain at least one sub-region, and determining at least one reference pixel in each sub-region;

[0049] The brightness and chromaticity of the display screen to be tested are measured by a first measuring device to obtain the brightness and chromaticity value of each pixel in the display screen to be tested, and the average brightness and chromaticity value of the reference pixels in each sub-area is calculated respectively;

[0050] The second measuring device measures the brightness and chromaticity of the reference pixels in each sub-region to obtain standard brightness and chromaticity values ​​of the reference pixels, and calculates the standard brightness and chromaticity average values ​​of the reference pixels in each sub-region respectively;

[0051] Calculate the correction coefficient corresponding to each sub-region according to the average brightness and chromaticity of the reference pixels in each sub-region and the average brightness and chromaticity of the standard;

[0052] The brightness and chromaticity values ​​of each pixel in each sub-region are corrected according to the correction coefficients corresponding to each sub-region to obtain the brightness and chromaticity correction values ​​of each pixel.

[0053] 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.

[0054] In an optional embodiment, the step of measuring the brightness and chromaticity of the display screen to be tested by a first measuring device to obtain the brightness and chromaticity value of each pixel in the display screen to be tested, and respectively calculating the average brightness and chromaticity value of the reference pixels in each sub-area includes:

[0055] When the display screen to be tested displays a three-primary color picture, the three-stimulus values ​​of each pixel in the display screen to be tested are measured by the first measuring device, wherein the three-primary color picture includes a red picture, a green picture and a blue picture, and the three-stimulus values ​​include an X stimulus value, a Y stimulus value and a Z stimulus value;

[0056] According to the tristimulus values ​​of the reference pixels in a sub-region, average values ​​of the tristimulus values ​​of the reference pixels in the sub-region are calculated respectively, and a first average value matrix corresponding to the sub-region is generated.

[0057] In an optional embodiment, the measuring the brightness and chromaticity of the reference pixels in each sub-region by a second measuring device to obtain standard brightness and chromaticity values ​​of the reference pixels, and respectively calculating the standard brightness and chromaticity average values ​​of the reference pixels in each sub-region, includes:

[0058] When the display screen to be tested displays three primary color images, the standard three stimulus values ​​of each reference pixel in each sub-area are measured by the second measuring device;

[0059] According to the standard tristimulus values ​​of each reference pixel in a sub-region, average values ​​of the standard tristimulus values ​​of the reference pixels in the sub-region are calculated respectively, and a second average value matrix corresponding to the sub-region is generated.

[0060] In an optional embodiment, the calculation of the correction coefficient corresponding to each sub-region according to the average brightness and chromaticity value of the reference pixels of each sub-region and the standard average brightness and chromaticity value includes:

[0061] A correction coefficient matrix corresponding to a sub-region is calculated according to a first average value matrix and a second average value matrix corresponding to the sub-region.

[0062] In an optional embodiment, the calculation of the correction coefficient matrix corresponding to a sub-region according to the first average value matrix and the second average value matrix corresponding to the sub-region is specifically:

[0063] The correction coefficient matrix corresponding to a sub-region is obtained by multiplying the inverse matrix of the first average value matrix corresponding to a sub-region by the second average value matrix, or by multiplying the second average value matrix corresponding to a sub-region by the inverse matrix of the first average value matrix.

[0064] 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.

[0065] In an optional embodiment, the first measuring device is an imaging brightness colorimeter, and the second measuring device is a standard spectroradiometer.

[0066] From the above description, it can be seen that using an imaging brightness colorimeter with higher measurement efficiency to measure all pixels and using a standard spectroradiometer with higher measurement accuracy to accurately measure reference pixels can ensure both high measurement efficiency and measurement accuracy.

[0067] like Figure 5 As shown, the present invention also provides a device for correcting pixel brightness and chromaticity of an optoelectronic display screen, comprising:

[0068] A division module 201 is used to divide the display screen to be tested into regions to obtain at least one sub-region, and to determine at least one reference pixel in each sub-region;

[0069] A first calculation module 202 is used to measure the brightness and chromaticity of the display screen to be tested by a first measuring device to obtain the brightness and chromaticity value of each pixel in the display screen to be tested, and to calculate the average brightness and chromaticity value of the reference pixels in each sub-area;

[0070] The second calculation module 203 is used to measure the brightness and chromaticity of the reference pixels in each sub-region by a second measurement device to obtain standard brightness and chromaticity values ​​of the reference pixels, and respectively calculate the standard brightness and chromaticity average values ​​of the reference pixels in each sub-region;

[0071] The third calculation module 204 is used to calculate the correction coefficient corresponding to each sub-region according to the average brightness and chromaticity of the reference pixels of each sub-region and the average brightness and chromaticity of the standard;

[0072] The correction module 205 is used to correct the brightness and chromaticity values ​​of each pixel in each sub-region according to the correction coefficient corresponding to each sub-region, so as to obtain the brightness and chromaticity correction value of each pixel.

[0073] like Figure 6 As shown, the present invention also provides an electronic device, the electronic device comprising:

[0074] One or more processors 301;

[0075] Storage device 302, used to store one or more programs;

[0076] When the one or more programs are executed by the one or more processors 301, the one or more processors 301 implement the above-mentioned method for correcting pixel brightness and chromaticity of an optoelectronic display screen.

[0077] The present invention also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned method for correcting the brightness and chromaticity of pixels on an optoelectronic display screen is implemented.

[0078] Embodiment 1

[0079] Please refer to Figure 7-10 Embodiment 1 of the present invention is: a method for correcting the brightness and chromaticity of pixels of an optoelectronic display screen, specifically correcting the measured value of the brightness and chromaticity, which can be applied to the calibration of an imaging brightness colorimeter to ensure the measurement accuracy of the imaging brightness colorimeter, thereby achieving efficient and high-precision measurement of the brightness and chromaticity of pixels of an optoelectronic display screen (including LCD, OLED, LED and other display screens).

[0080] In this embodiment, the first measuring device is an imaging brightness colorimeter, which is used to measure the brightness and chromaticity values ​​of all pixels in the display screen to be tested; the second measuring device is a standard spectroradiometer (equivalent to a point-type spectrometer), which is used to measure the standard brightness and chromaticity values ​​of reference pixels.

[0081] like Figure 7 As shown, the method of this embodiment includes the following steps:

[0082] S1: Divide the display screen to be tested into regions to obtain at least one sub-region.

[0083] 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.

[0084] Therefore, according to the size of the display screen to be tested and the measuring distance of the imaging brightness colorimeter, 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.

[0085] S2: Determine at least one reference pixel in each sub-region.

[0086] Specifically, according to the parameters and working conditions of the display screen to be tested (including display screen resolution, brightness, sub-region size, pixel size, pixel brightness and chromaticity uniformity, etc.), several pixels are selected in each sub-region as reference pixels, and the number of reference pixels can range from 1 to all pixels in the sub-region. When the number of selected reference pixels is small, the correction effect on the brightness and chromaticity values ​​of other non-reference pixels is poor; when the number of selected reference pixels is large, the correction workload is too large. Preferably, 2×2, 3×3 or 4×4 reference pixels can be selected.

[0087] In this embodiment, 3×3 reference pixels are selected in each sub-region and located at the center of the sub-region, such as Fig.10 shown.

[0088] S3: measuring the brightness and chromaticity of the display screen to be tested by a first measuring device to obtain the brightness and chromaticity value of each pixel in the display screen to be tested.

[0089] Specifically, when the display screen to be tested displays three primary color images, namely, a red (R) image, a green (G) image, and a blue (B) image, an imaging brightness colorimeter is used to perform measurements to obtain the three stimulus values ​​of each pixel in the display screen to be tested, wherein the three stimulus values ​​include an X stimulus value, a Y stimulus value, and a Z stimulus value, that is, the X stimulus value, Y stimulus value, and Z stimulus value of the red (R) sub-pixel, the X stimulus value, Y stimulus value, and Z stimulus value of the green (G) sub-pixel, and the X stimulus value, Y stimulus value, and Z stimulus value of the blue (B) sub-pixel (each pixel on a general photoelectric display screen consists of a red and a blue sub-pixel, and a green sub-pixel, ... Green and green are the three primary colors. Each color on each pixel is called a "sub-pixel". Each sub-pixel processes a color channel, that is, each pixel on the display screen contains R sub-pixels, G sub-pixels, and B sub-pixels. At the same time, because the CIE1931-RGB system will have negative values ​​when calculating, it is difficult to understand and inconvenient to use. Therefore, the CIE1931-XYZ standard colorimetry system is now used. The XYZ tristimulus values ​​of the standard colorimetry system do not correspond to the RGB tristimulus values ​​one by one, that is, red R, green G, and blue B all have corresponding XYZ tristimulus values), which are expressed as follows:

[0090]

[0091]

[0092] Among them, R_X init , R_Y init and R_Z init G_X represents the X stimulus value, Y stimulus value and Z stimulus value of each pixel when the display screen to be tested displays a red image, that is, the X stimulus value, Y stimulus value and Z stimulus value of the red (R) sub-pixel in each pixel; init , G_Y init and G_Z init B_X represents the X stimulus value, Y stimulus value and Z stimulus value of each pixel when the display screen to be tested displays a green image, that is, the X stimulus value, Y stimulus value and Z stimulus value of the green (G) sub-pixel of each pixel; init , B_Y init and B_Z init They respectively represent the X stimulus value, Y stimulus value and Z stimulus value of each pixel when the display screen to be tested displays a blue picture, that is, the X stimulus value, Y stimulus value and Z stimulus value of the blue (B) sub-pixel of each pixel; (i, j) represents the coordinates of the pixel in the i-th row and j-th column of the display screen to be tested, and m and n are the total number of rows and total number of columns of pixels of the display screen to be tested, respectively.

[0093] S4: Calculate the average brightness and chromaticity values ​​of the reference pixels in each sub-region according to the brightness and chromaticity values ​​of each reference pixel in each sub-region.

[0094] Specifically, according to the tristimulus values ​​of each reference pixel in a sub-region, the average values ​​of the tristimulus values ​​of each reference pixel in the sub-region are calculated respectively, and arranged to obtain a first average value matrix corresponding to the sub-region.

[0095] For example, taking the first sub-region as an example, assuming that the size of the first sub-region is m1×n1, that is, it includes m1 rows and n1 columns, where the l1th row to the l2th row and the k1th column to the k2th column are reference pixels, that is, the reference pixels in the first sub-region are located in the rectangular area formed by (l1, k1) to (l2, k2), 1≤l1≤l2≤m1, 1≤k1≤k2≤n1. Then calculate the average value of the three stimulus values ​​of the reference pixels in the sub-region according to the following formula:

[0096]

[0097]

[0098] Among them, R_X 1init_avg , R_Y 1init_avg and R_Z 1init_avg G_X represents the average value of the X stimulus value, the average value of the Y stimulus value, and the average value of the Z stimulus value of the reference pixel in the first sub-region when the display screen to be tested displays a red image, that is, the average value of the X stimulus value, the average value of the Y stimulus value, and the average value of the Z stimulus value of the red (R) sub-pixel in the reference pixel in the first sub-region of the display screen to be tested; 1init_avg , G_Y 1init_avg and G_Z 1init_avg respectively represent the average values ​​of the X stimulus value, the Y stimulus value, and the Z stimulus value of the reference pixels in the first sub-region when the display screen to be tested displays a green image, that is, the average values ​​of the X stimulus value, the Y stimulus value, and the Z stimulus value of the green (G) sub-pixels in the reference pixels in the first sub-region of the display screen to be tested; B_X 1init_avg , B_Y 1init_avg and B_Z 1init_avg They respectively represent the average values ​​of the X stimulus values, the average values ​​of the Y stimulus values, and the average values ​​of the Z stimulus values ​​of the reference pixels in the first sub-region when the display screen to be tested displays a blue picture, that is, the average values ​​of the X stimulus values, the average values ​​of the Y stimulus values, and the average values ​​of the Z stimulus values ​​of the blue (B) sub-pixels in the reference pixels in the first sub-region of the display screen to be tested.

[0099] Then the average values ​​of the three stimulus values ​​are arranged into a matrix to obtain the first average value matrix L corresponding to the first sub-region 1init :

[0100]

[0101] In this way, the first average value matrix corresponding to each sub-region is obtained.

[0102] S5: The second measuring device measures the brightness and chromaticity of the reference pixels in each sub-region to obtain standard brightness and chromaticity values ​​of the reference pixels, and calculates the standard brightness and chromaticity average values ​​of the reference pixels in each sub-region according to the standard brightness and chromaticity values ​​of the reference pixels in each sub-region.

[0103] Specifically, when the display screen to be tested displays three primary color images, namely, red (R), green (G) and blue (B), a standard spectroradiometer is used to measure each reference pixel to obtain a standard tristimulus value of each reference pixel in each sub-region. Then, according to the standard tristimulus values ​​of each reference pixel in a sub-region, the average values ​​of the standard tristimulus values ​​of the reference pixels in the sub-region are calculated respectively, and the second average value matrix corresponding to the sub-region is obtained by arranging.

[0104] For example, taking the first sub-region as an example, the size of the first sub-region is m1×n1, wherein the l1th row to the l2th row and the k1th column to the k2th column are reference pixels, 1≤l1≤l2≤m1, 1≤k1≤k2≤n1; the average value of the standard three stimulus values ​​of the reference pixels of the sub-region is calculated according to the following formula:

[0105]

[0106]

[0107] Among them, R_X std(i,j) , R_Y std(i,j) and R_Z std(i,j) G_X represents the standard X stimulus value, standard Y stimulus value and standard Z stimulus value of the reference pixel in the i-th row and j-th column when the display screen to be tested displays a red image, that is, the standard X stimulus value, standard Y stimulus value and standard Z stimulus value of the red (R) sub-pixel in the reference pixel in the i-th row and j-th column; std(i,j) , G_Y std(i,j) and G_Z std(i,j) B_X represents the standard X stimulus value, standard Y stimulus value and standard Z stimulus value of the reference pixel in the i-th row and j-th column when the display screen to be tested displays a green image, that is, the standard X stimulus value, standard Y stimulus value and standard Z stimulus value of the green (G) sub-pixel in the reference pixel in the i-th row and j-th column; std(i,j) , B_Y std(i,j) and B_Z std(i,j) They respectively represent the standard X stimulus value, standard Y stimulus value, and standard Z stimulus value of the reference pixel in the i-th row and j-th column when the display screen to be tested displays a blue picture, that is, the standard X stimulus value, standard Y stimulus value, and standard Z stimulus value of the blue (B) sub-pixel in the reference pixel in the i-th row and j-th column.

[0108] R_X1std_avg , R_Y 1std_avg and R_Z 1std_avg G_X represents the average value of the standard X stimulus value, the average value of the standard Y stimulus value, and the average value of the standard Z stimulus value of the reference pixels in the first sub-area when the display screen to be tested displays a red image, that is, the average value of the standard X stimulus value, the average value of the standard Y stimulus value, and the average value of the standard Z stimulus value of the red (R) sub-pixels in the reference pixels in the first sub-area of ​​the display screen to be tested; 1std_avg , G_Y 1std_avg and G_Z 1std_avg respectively represent the average values ​​of the standard X stimulus value, the average values ​​of the standard Y stimulus value, and the average values ​​of the standard Z stimulus value of the reference pixels in the first sub-area when the display screen to be tested displays a green image, that is, the average values ​​of the standard X stimulus value, the average values ​​of the standard Y stimulus value, and the average values ​​of the standard Z stimulus value of the green (G) sub-pixels in the reference pixels in the first sub-area of ​​the display screen to be tested; B_X 1std_avg , B_Y 1std_avg and B_Z 1std_avg They respectively represent the average values ​​of the standard X stimulus values, the average values ​​of the standard Y stimulus values, and the average values ​​of the standard Z stimulus values ​​of the reference pixels in the first sub-region when the display screen to be tested displays a blue image, that is, the average values ​​of the standard X stimulus values, the average values ​​of the standard Y stimulus values, and the average values ​​of the standard Z stimulus values ​​of the blue (B) sub-pixels in the reference pixels in the first sub-region of the display screen to be tested.

[0109] Then the average values ​​of these standard three stimulus values ​​are arranged into a matrix to obtain the second average value matrix L corresponding to the first sub-area 1std :

[0110]

[0111] In this way, the second average value matrix corresponding to each sub-region is obtained.

[0112] S6: Calculate the correction coefficient corresponding to each sub-region according to the average brightness and chromaticity of the reference pixels in each sub-region and the average brightness and chromaticity of the standard.

[0113] Specifically, a correction coefficient matrix corresponding to a sub-region is calculated according to a first average value matrix and a second average value matrix corresponding to the sub-region.

[0114] In one embodiment, the inverse matrix of the first average value matrix corresponding to a sub-region is multiplied by the second average value matrix to obtain the correction coefficient matrix corresponding to the sub-region. For example, taking the first sub-region as an example, its corresponding correction coefficient matrix mCal1 is:

[0115]

[0116] In another embodiment, the second average value matrix corresponding to a sub-region is multiplied by the inverse matrix of the first average value matrix to obtain the correction coefficient matrix corresponding to the sub-region. For example, taking the first sub-region as an example, its corresponding correction coefficient matrix mCal1 is:

[0117]

[0118] By analogy, the correction coefficient matrix corresponding to each sub-region is obtained.

[0119] S7: Correcting the brightness and chromaticity values ​​of each pixel in each sub-region according to the correction coefficient corresponding to each sub-region to obtain a brightness and chromaticity correction value of each pixel.

[0120] Specifically, according to the correction coefficient matrix corresponding to a sub-region, the brightness and chromaticity values ​​of each pixel in the sub-region are corrected to obtain the brightness and chromaticity correction values ​​of each pixel in the sub-region. For example, taking the pixel with row and column coordinates (1, 1) in the first sub-region as an example, assuming that the brightness and chromaticity value matrix L of the pixel is init(1,1) for:

[0121]

[0122] Among them, R_X' init(1,1) , R_Y' init(1,1) , R_Z' init(1,1) respectively represent the tristimulus values ​​(i.e., X stimulus value, Y stimulus value, and Z stimulus value) of the red sub-pixel of the pixel with row and column coordinates (1, 1) in the first sub-region of the display screen to be tested measured by the first measuring device (imaging brightness colorimeter), G_X' init(1,1) , G_Y' init(1,1) , G_Z' init(1,1) Respectively represent the three stimulus values ​​of the green sub-pixel of the pixel, B_X' init(1,1) , B_Y' init(1,1) , B_Z' init(1,1) The three stimulus values ​​of the blue sub-pixel of the pixel are represented respectively. In this step, the picture displayed on the display screen to be tested can be any picture.

[0123] The brightness and chromaticity values ​​of the pixel are corrected using the correction coefficient matrix corresponding to the first sub-region to obtain the brightness and chromaticity correction value L of the pixel. cv1,1) , the calculation formula is as follows:

[0124]

[0125] By analogy, the brightness and chromaticity correction values ​​of other pixels in sub-area 1 are obtained. Similarly, the brightness and chromaticity correction values ​​of all pixels in other sub-areas are obtained, so that the brightness and chromaticity correction values ​​of all pixels in the display screen to be tested can be obtained.

[0126] In this embodiment, the measurement values ​​of a number of reference pixels by a standard spectroradiometer are used as standard values, and a correction coefficient matrix is ​​calculated according to the brightness and chromaticity values ​​of the reference pixels and the standard brightness and chromaticity values, and the measurement values ​​of the imaging brightness and chromaticity meter are corrected, so that high-precision brightness and chromaticity values ​​of all pixels of the display screen to be measured can be obtained. Compared with the measurement values ​​(standard values) of the spectroradiometer, 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 values ​​is achieved.

[0127] The brightness measurement accuracy of the standard spectroradiometer is ±2%, and the chromaticity coordinate deviation is ±0.002. The measurement accuracy is much higher than that of the filter-type imaging brightness colorimeter. Therefore, the measurement accuracy of the imaging brightness colorimeter can be greatly improved by using the measurement values ​​of the high-precision instrument based on the spectral method to calibrate the lower-precision instrument based on the color filter method.

[0128] The measured value of the standard spectroradiometer is used as the standard value to directly correct the measured value of the imaging brightness colorimeter, thereby reducing the measurement and correction links and reducing the error introduced in the correction process. Compared with the existing technology, since the standard white field meter and color analyzer are not used, the error introduced in the measurement and correction links is also reduced.

[0129] 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.

[0130] Embodiment 2

[0131] Please refer to Figure 5 The second embodiment of the present invention is: a device for correcting the brightness and chromaticity of a photoelectric display screen pixel, which can execute the method for correcting the brightness and chromaticity of a photoelectric display screen pixel provided by 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:

[0132] A division module 201 is used to divide the display screen to be tested into regions to obtain at least one sub-region, and to determine at least one reference pixel in each sub-region;

[0133] A first calculation module 202 is used to measure the brightness and chromaticity of the display screen to be tested by a first measuring device to obtain the brightness and chromaticity value of each pixel in the display screen to be tested, and to calculate the average brightness and chromaticity value of the reference pixels in each sub-area;

[0134] The second calculation module 203 is used to measure the brightness and chromaticity of the reference pixels in each sub-region by a second measurement device to obtain standard brightness and chromaticity values ​​of the reference pixels, and respectively calculate the standard brightness and chromaticity average values ​​of the reference pixels in each sub-region;

[0135] The third calculation module 204 is used to calculate the correction coefficient corresponding to each sub-region according to the average brightness and chromaticity of the reference pixels of each sub-region and the average brightness and chromaticity of the standard;

[0136] The correction module 205 is used to correct the brightness and chromaticity values ​​of each pixel in each sub-region according to the correction coefficient corresponding to each sub-region, so as to obtain the brightness and chromaticity correction value of each pixel.

[0137] 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.

[0138] In an optional implementation, the first calculation module 202 includes:

[0139] A first measuring unit is used to measure the tristimulus values ​​of each pixel in the display screen to be tested by a first measuring device when the display screen to be tested displays a three-primary color picture, wherein the three-primary color picture includes a red picture, a green picture and a blue picture, and the tristimulus values ​​include an X stimulus value, a Y stimulus value and a Z stimulus value;

[0140] The first calculation unit is used to calculate the average values ​​of the tristimulus values ​​of each reference pixel in a sub-region according to the tristimulus values ​​of each reference pixel in the sub-region, and generate a first average value matrix corresponding to the sub-region.

[0141] In an optional implementation, the second calculation module 203 includes:

[0142] A second measuring unit is used to measure and obtain the standard three stimulus values ​​of each reference pixel in each sub-area through a second measuring device when the display screen to be tested displays a three-primary color picture;

[0143] The second calculation unit is used to calculate the average values ​​of the standard tristimulus values ​​of the reference pixels in a sub-region according to the standard tristimulus values ​​of each reference pixel in the sub-region, and generate a second average value matrix corresponding to the sub-region.

[0144] In an optional implementation, the third calculation module 204 includes:

[0145] The third calculation unit is used to calculate a correction coefficient matrix corresponding to a sub-region according to the first average value matrix and the second average value matrix corresponding to the sub-region.

[0146] In an optional embodiment, the third calculation unit is specifically used to multiply the inverse matrix of the first average value matrix corresponding to a sub-region by the second average value matrix, or to multiply the second average value matrix corresponding to a sub-region by the inverse matrix of the first average value matrix, to obtain the correction coefficient matrix corresponding to the sub-region.

[0147] Embodiment 3

[0148] Please refer to Figure 6 , Embodiment 3 of the present invention is: an electronic device, the electronic device comprising:

[0149] One or more processors 301;

[0150] Storage device 302, used to store one or more programs;

[0151] 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 optoelectronic display screen pixel brightness and chromaticity correction method as described above, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0152] Embodiment 4

[0153] 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 correcting 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.

[0154] In summary, the present invention provides a method, device, equipment and storage medium for correcting the brightness and chromaticity of pixels on an optoelectronic display screen. 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; a number of pixels are selected in each sub-area as reference pixels, and the measurement value of the standard spectroradiometer is used as the standard value, and the correction coefficient matrix is ​​calculated based on the brightness and chromaticity measurement value of the reference pixel and the brightness and chromaticity standard value, and the measurement value of the imaging brightness colorimeter is corrected, so that the high-precision brightness and chromaticity values ​​of all pixels of the display screen to be tested can be obtained. The measurement value of a high-precision instrument based on the spectral method is used to correct the measurement value of a lower-precision instrument based on the color filter method, so that the measurement accuracy of the imaging brightness colorimeter can be greatly improved; the measurement value of the standard spectroradiometer is used as the standard value to directly correct the measurement value of the imaging brightness colorimeter, thereby reducing the measurement links and reducing the errors introduced in the measurement and correction process.

[0155] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, a read-only memory (ROM), a random access memory (RAM), a flash memory (FLASH), a hard disk or an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0156] 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.

[0157] 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 correcting pixel brightness and chromaticity of an optoelectronic display screen, characterized in that: include: Dividing the display screen to be tested into regions to obtain at least one sub-region, and determining at least one reference pixel in each sub-region; The brightness and chromaticity of the display screen to be tested are measured by a first measuring device to obtain the brightness and chromaticity value of each pixel in the display screen to be tested, and the average brightness and chromaticity value of the reference pixels in each sub-area is calculated respectively; The second measuring device measures the brightness and chromaticity of the reference pixels in each sub-region to obtain standard brightness and chromaticity values ​​of the reference pixels, and calculates the standard brightness and chromaticity average values ​​of the reference pixels in each sub-region respectively; Calculate the correction coefficient corresponding to each sub-region according to the average brightness and chromaticity of the reference pixels in each sub-region and the average brightness and chromaticity of the standard; The brightness and chromaticity values ​​of each pixel in each sub-region are corrected according to the correction coefficients corresponding to each sub-region to obtain the brightness and chromaticity correction values ​​of each pixel.

2. The method for correcting pixel brightness and chromaticity of an optoelectronic display screen according to claim 1, characterized in that: The method of measuring the brightness and chromaticity of the display screen to be tested by the first measuring device to obtain the brightness and chromaticity value of each pixel in the display screen to be tested, and respectively calculating the average brightness and chromaticity value of the reference pixels in each sub-area, includes: When the display screen to be tested displays a three-primary color picture, the three-stimulus values ​​of each pixel in the display screen to be tested are measured by the first measuring device, wherein the three-primary color picture includes a red picture, a green picture and a blue picture, and the three-stimulus values ​​include an X stimulus value, a Y stimulus value and a Z stimulus value; According to the tristimulus values ​​of the reference pixels in a sub-region, average values ​​of the tristimulus values ​​of the reference pixels in the sub-region are calculated respectively, and a first average value matrix corresponding to the sub-region is generated.

3. The method for correcting pixel brightness and chromaticity of an optoelectronic display screen according to claim 2, characterized in that: The method of measuring the brightness and chromaticity of the reference pixels in each sub-region by a second measuring device to obtain standard brightness and chromaticity values ​​of the reference pixels, and respectively calculating the standard brightness and chromaticity average values ​​of the reference pixels in each sub-region includes: When the display screen to be tested displays three primary color images, the standard three stimulus values ​​of each reference pixel in each sub-area are measured by the second measuring device; According to the standard tristimulus values ​​of each reference pixel in a sub-region, average values ​​of the standard tristimulus values ​​of the reference pixels in the sub-region are calculated respectively, and a second average value matrix corresponding to the sub-region is generated.

4. The method for correcting pixel brightness and chromaticity of an optoelectronic display screen according to claim 3, characterized in that: The step of calculating the correction coefficient corresponding to each sub-region according to the average brightness and chromaticity value of the reference pixels of each sub-region and the average brightness and chromaticity value of the standard pixels respectively comprises: A correction coefficient matrix corresponding to a sub-region is calculated according to a first average value matrix and a second average value matrix corresponding to the sub-region.

5. The method for correcting pixel brightness and chromaticity of an optoelectronic display screen according to claim 4, characterized in that: The calculation of the correction coefficient matrix corresponding to a sub-region according to the first average value matrix and the second average value matrix corresponding to the sub-region is specifically: The correction coefficient matrix corresponding to a sub-region is obtained by multiplying the inverse matrix of the first average value matrix corresponding to a sub-region by the second average value matrix, or by multiplying the second average value matrix corresponding to a sub-region by the inverse matrix of the first average value matrix.

6. The method for correcting pixel brightness and chromaticity of an optoelectronic display screen 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 correcting pixel brightness and chromaticity of an optoelectronic display screen 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 standard spectroradiometer.

8. A device for correcting pixel brightness and chromaticity of an optoelectronic display screen, characterized in that: include: A division module, used for dividing the display screen to be tested into regions to obtain at least one sub-region, and determining at least one reference pixel in each sub-region; A first calculation module is used to measure the brightness and chromaticity of the display screen to be tested by a first measuring device to obtain the brightness and chromaticity value of each pixel in the display screen to be tested, and to calculate the average brightness and chromaticity value of the reference pixels in each sub-area; A second calculation module is used to measure the brightness and chromaticity of the reference pixels in each sub-region by a second measurement device to obtain standard brightness and chromaticity values ​​of the reference pixels, and respectively calculate the standard brightness and chromaticity average values ​​of the reference pixels in each sub-region; A third calculation module, used to calculate the correction coefficient corresponding to each sub-region according to the average brightness and chromaticity of the reference pixels of each sub-region and the average brightness and chromaticity of the standard; The correction module is used to correct the brightness and chromaticity values ​​of each pixel in each sub-region according to the correction coefficient corresponding to each sub-region, so as to obtain the brightness and chromaticity correction value of each pixel.

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 correcting pixel brightness and chromaticity of an optoelectronic display screen as described in any one of claims 1-7.

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 correcting 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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