Method, device and equipment for correcting optical display parameters of photoelectric display screen

Abstract

The invention relates to the technical field of display screen correction, solves the problem of low correction precision of optical display parameters on a photoelectric display screen in the prior art, and provides an optical display parameter correction method, device and equipment of the photoelectric display screen. The method comprises the following steps: acquiring a mapping relation between a driving gray-scale value and a tristimulus value of each color sub-pixel on the photoelectric display screen; determining target brightness and chrominance according to the brightness and chrominance distribution characteristics of each color sub-pixel in the correction picture under a preset test condition; according to the mapping relation, the target brightness and chrominance and a brightness and chrominance deviation allowable interval corresponding to the test condition, calculating each color sub-pixel driving gray scale combination of each pixel under the test condition, and determining a target driving gray scale combination; and adjusting driving control parameters of the photoelectric display screen according to the target driving gray scale combination, and outputting the adjusted driving control parameters to the photoelectric display screen. According to the invention, the optical display parameter correction precision under the conditions of low gray scale and full color gamut is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of display screen correction, and in particular to a method, device and equipment for optical display parameter correction of optoelectronic display screens. BACKGROUND

[0002] Optoelectronic display screens are widely used in new display technologies such as Mini LED, Micro LED and OLED, and their display effects directly affect the visual experience of terminal products. However, due to factors such as device process differences and inconsistent pixel aging, optoelectronic display screens are prone to defects such as non-uniform brightness and chrominance (also known as Mura phenomenon) in actual use, which manifests as non-uniformity in brightness and chrominance distribution of the picture. In order to improve the brightness and chrominance uniformity of the entire screen, optical display parameter correction (also known as brightness and chrominance compensation, Demura) needs to be performed on the optoelectronic display screen to ensure the uniformity and accuracy of the display picture under different brightness and color conditions.

[0003] In existing optical display parameter correction techniques, brightness correction generally includes two modes: white picture correction and single-color picture correction. The brightness of white, red, green and blue pictures at several gray scales is generally measured by an imaging brightness and chrominance meter, the relationship between gray scale and brightness is obtained by curve fitting, and then the current or voltage weight of the entire pixel is adjusted to correct the brightness according to the ratio of the target brightness to the measured brightness. The chrominance correction method is relatively less common, which generally adjusts the luminous intensity of other color sub-pixels of the same pixel to make the mixed brightness and chrominance close to the target value, thereby improving the chrominance uniformity. In this process, the brightness and chrominance of each sub-pixel of the display screen at different gray scales will change nonlinearly, and the corresponding relationship between the tristimulus values of each color sub-pixel and the gray scale is not the same.

[0004] However, the existing technology still has many deficiencies: first, some methods only measure a small number of gray scales and perform curve fitting, which has low correction accuracy at low gray scales; second, the proportional relationship of tristimulus values at different gray scales is not constant, which leads to non-integer values of RGB color steps calculated from the target tristimulus values, while the actual display screen sub-pixels can only work at discrete integer gray scales, and directly taking the closest value can cause a large deviation between the brightness and chrominance and the target value; third, the determination of the target brightness and chrominance in the existing technology is usually based on the centroid or average value of the pixel distribution, which may lead to ineffective correction of some pixels due to the inability to improve the brightness or the target chrominance being outside the mixable range; and finally, since the same driving signal of a sub-pixel determines all components of its tristimulus values, the existing method cannot independently adjust individual components, which limits the accuracy of chrominance compensation.

[0005] Therefore, how to improve the accuracy of optical display parameter correction on optoelectronic display screens is a problem to be solved. SUMMARY

[0006] Therefore, the embodiments of the present application provide a method, device and equipment for correcting optical display parameters of a photoelectric display screen, to solve the problem of low correction accuracy of optical display parameters on the photoelectric display screen in the prior art.

[0007] In a first aspect, the embodiments of the present application provide a method for correcting optical display parameters of a photoelectric display screen, comprising:

[0008] obtaining a mapping relationship between driving gray scale values and corresponding tristimulus values of each color sub-pixel in each pixel on the photoelectric display screen;

[0009] determining a target lightness according to lightness distribution characteristics of each color sub-pixel in a correction picture under a preset test condition, wherein the preset test condition comprises setting a driving gray scale value as a target gray scale value and setting a correction picture color type as a target color type;

[0010] calculating a driving gray scale combination of each color sub-pixel in each pixel on the photoelectric display screen under the test condition according to the mapping relationship, the target lightness and a lightness deviation allowable interval corresponding to the test condition, and determining a target driving gray scale combination;

[0011] adjusting a driving control parameter of the photoelectric display screen according to the target driving gray scale combination, outputting the adjusted driving control parameter to the photoelectric display screen, and realizing correction of optical display parameters.

[0012] Preferably, the obtaining of the mapping relationship between the driving gray scale values and the corresponding tristimulus values of each color sub-pixel in each pixel on the photoelectric display screen comprises:

[0013] obtaining a preset target color space and a driving gray scale value set of a color channel in the target color space;

[0014] controlling the photoelectric display screen to display a test picture of full white with different gray scale values according to each driving gray scale value in the driving gray scale value set;

[0015] performing image acquisition and measurement on the test picture by an imaging type brightness colorimeter, and obtaining tristimulus value measurement results of each color sub-pixel in each pixel under different gray scale values;

[0016] associating and matching the tristimulus value measurement results and the corresponding driving gray scale values, and determining the mapping relationship.

[0017] Preferably, the determining of the target lightness according to the lightness distribution characteristics of each color sub-pixel in the correction picture under the preset test condition comprises:

[0018] According to the preset test condition and the mapping relationship, target tristimulus values of each color sub-pixel in the correction picture are obtained;

[0019] It is determined whether the correction picture is a single-color correction picture or a non-single-color correction picture;

[0020] If the correction picture is a single-color correction picture, each target tristimulus value is converted into a chromaticity coordinate value in a preset target uniform chromaticity space according to the target tristimulus value and the target uniform chromaticity space;

[0021] According to each chromaticity coordinate value, a first chromaticity distance between a chromaticity coordinate corresponding to each color sub-pixel and a preset equal-energy white light chromaticity coordinate is calculated;

[0022] According to each first chromaticity distance, a first chromaticity distance set corresponding to each color channel sub-pixel is determined;

[0023] According to a color type corresponding to the single-color correction picture, a target color channel sub-pixel corresponding to the color type is determined;

[0024] According to the first chromaticity distance set, a target chromaticity distance set corresponding to the target color channel sub-pixel is obtained;

[0025] Each target chromaticity distance in the target chromaticity distance set is compared, and a chromaticity coordinate of a color sub-pixel corresponding to a minimum target chromaticity distance is taken as a target chromaticity coordinate;

[0026] Each luminance value in the target tristimulus value is compared, and a minimum luminance value is taken as a target luminance value;

[0027] According to the target chromaticity coordinate and the target luminance value, the target light chromaticity is determined.

[0028] Preferably, after the determination of whether the correction picture is a single-color correction picture or a non-single-color correction picture, the method further comprises:

[0029] If the correction picture is a non-single-color correction picture, each synthesized tristimulus value is calculated according to a target tristimulus value of each color channel sub-pixel in the non-single-color correction picture;

[0030] Each synthesized tristimulus value is converted into a corresponding synthesized chromaticity coordinate in the target uniform chromaticity space, and a second chromaticity distance between each synthesized chromaticity coordinate and a preset equal-energy white light chromaticity coordinate is calculated;

[0031] Each second chromaticity distance is compared, and a synthesized chromaticity coordinate corresponding to a minimum second chromaticity distance is taken as the target chromaticity coordinate;

[0032] Comparing the brightness values in each of the synthetic tristimulus values, the minimum brightness value is taken as the target brightness value.

[0033] Preferably, the calculating the color sub-pixel driving gray scale combination of each pixel on the optoelectronic display screen under the test condition according to the mapping relationship, the target lightness and the lightness deviation allowed interval corresponding to the test condition comprises:

[0034] Combining the driving gray scale values of each color sub-pixel of each pixel on the optoelectronic display screen under the test condition to obtain a candidate combination set of each color sub-pixel driving gray scale combination;

[0035] According to the mapping relationship, synthesizing the tristimulus values of each color sub-pixel corresponding to each driving gray scale combination in the candidate combination set to obtain a pixel synthetic tristimulus value corresponding to each driving gray scale combination;

[0036] According to each of the pixel synthetic tristimulus values, calculating the lightness of each driving gray scale combination to obtain each test lightness, wherein the test lightness includes a test brightness value and a test chroma coordinate;

[0037] Calculating the deviation of each of the test lightness and the target lightness to obtain a lightness deviation value;

[0038] According to the lightness deviation value and the lightness deviation allowed interval, screening each driving gray scale combination in the candidate combination set to obtain a candidate combination subset whose lightness deviation value is within the lightness deviation allowed interval;

[0039] Comparing the lightness deviation values corresponding to each driving gray scale combination in the candidate combination subset, and determining the target driving gray scale combination according to the comparison result.

[0040] Preferably, the combining the driving gray scale values of each color sub-pixel of each pixel on the optoelectronic display screen under the test condition to obtain a candidate combination set of each color sub-pixel driving gray scale combination comprises:

[0041] According to the gray scale range corresponding to the preset test condition and the target color channel, setting initial driving gray scale values for the first color sub-pixel, the second color sub-pixel and the third color sub-pixel of different color channels respectively to obtain a traversal starting gray scale value set;

[0042] According to the initial driving gray scale value of the first color sub-pixel and the preset gray scale step, sequentially increasing the first color sub-pixel driving gray scale value to obtain a first color sub-pixel driving gray scale value candidate set;

[0043] On the basis of the first color sub-pixel driving gray scale value candidate set, the second color sub-pixel driving gray scale value is sequentially increased according to the initial driving gray scale value of the second color sub-pixel and a preset gray scale step, to obtain a second color sub-pixel driving gray scale value candidate set;

[0044] On the basis of the combination of the first color sub-pixel and the second color sub-pixel driving gray scale value candidate set, the third color sub-pixel driving gray scale value is sequentially increased according to the initial driving gray scale value of the third color sub-pixel and a preset gray scale step, to obtain a third color sub-pixel driving gray scale value candidate set;

[0045] According to the first color sub-pixel driving gray scale value candidate set, the second color sub-pixel driving gray scale value candidate set and the third color sub-pixel driving gray scale value, the driving gray scale values of each color sub-pixel are combined to obtain the candidate combination set.

[0046] Preferably, the synthesizing of the three stimulus values of each color sub-pixel corresponding to each driving gray scale combination in the candidate combination set according to the mapping relationship to obtain the pixel synthesis three stimulus value corresponding to each driving gray scale combination comprises:

[0047] The first driving gray scale value of the first color sub-pixel, the second driving gray scale value of the second color sub-pixel and the third driving gray scale value of the third color sub-pixel in each driving gray scale combination are obtained.

[0048] According to the mapping relationship, the first driving gray scale value, the second driving gray scale value and the third driving gray scale value are respectively mapped to obtain the first color sub-pixel three stimulus value, the second color sub-pixel three stimulus value and the third color sub-pixel three stimulus value.

[0049] The first color sub-pixel three stimulus value, the second color sub-pixel three stimulus value and the third color sub-pixel three stimulus value are summed to obtain the pixel synthesis three stimulus value.

[0050] Preferably, the comparing of the lightness deviation values corresponding to each driving gray scale combination in the candidate combination set according to the comparison result to determine the target driving gray scale combination comprises:

[0051] According to each lightness deviation value, it is judged whether the lightness deviation value meets a preset lightness preferred threshold condition;

[0052] In the driving gray scale combination meeting the lightness preferred threshold condition, the lightness deviation values between the lightness of the pixel synthesized by each color sub-pixel and the target lightness are compared to obtain a first preferred combination with the minimum lightness deviation value;

[0053] In the driving gray scale combination corresponding to the first preferred combination, the chroma deviation values of each driving gray scale combination are compared according to the rule of comparing the chroma deviation values, and a second preferred combination with the minimum chroma deviation value is obtained.

[0054] According to the driving gray scale combination corresponding to the second preferred combination, the target driving gray scale combination is determined.

[0055] In a second aspect, an embodiment of the present application provides an optical display parameter correction device of an optoelectronic display screen, the device comprising:

[0056] A mapping relationship acquisition module is configured to acquire a mapping relationship between driving gray scale values and corresponding tristimulus values of each color sub-pixel in each pixel of the optoelectronic display screen.

[0057] A target bright chroma determination module is configured to determine a target bright chroma according to bright chroma distribution characteristics of each color sub-pixel in a correction picture under a preset test condition, wherein the preset test condition comprises that the driving gray scale value is set as a target gray scale value and the correction picture color type is set as a target color type.

[0058] A target driving gray scale combination module is configured to calculate each color sub-pixel driving gray scale combination of each pixel on the optoelectronic display screen under the test condition according to the mapping relationship, the target bright chroma, and a bright chroma deviation allowed interval corresponding to the test condition, and determine a target driving gray scale combination.

[0059] A driving control parameter adjustment module is configured to adjust driving control parameters of the optoelectronic display screen according to the target driving gray scale combination, output the adjusted driving control parameters to the optoelectronic display screen, and realize correction of the optical display parameters.

[0060] In a third aspect, an embodiment of the present application provides an optical display parameter correction device of an optoelectronic display screen, comprising at least one processor, at least one memory, and computer program instructions stored in the memory, when the computer program instructions are executed by the processor, the method of the first aspect in the above-mentioned embodiment is realized.

[0061] In a fourth aspect, an embodiment of the present application provides a storage medium having computer program instructions stored thereon, when the computer program instructions are executed by a processor, the method of the first aspect in the above-mentioned embodiment is realized.

[0062] In summary, the beneficial effects of the present application are as follows:

[0063] The optical display parameter correction method, device and equipment of the photoelectric display screen provided by the embodiment of the application, the method comprises: obtaining the mapping relationship between the driving gray scale value and the corresponding tristimulus value of each color sub-pixel in each pixel on the photoelectric display screen; determining a target light chroma according to the light chroma distribution characteristics of each color sub-pixel in a correction picture under a preset test condition, wherein the preset test condition comprises that the driving gray scale value is set as a target gray scale value and the color type of the correction picture is set as a target color type; calculating the driving gray scale combination of each color sub-pixel of each pixel on the photoelectric display screen under the test condition according to the mapping relationship, the target light chroma and a light chroma deviation allowable interval corresponding to the test condition, and determining a target driving gray scale combination; adjusting the driving control parameter of the photoelectric display screen according to the target driving gray scale combination, outputting the adjusted driving control parameter to the photoelectric display screen, and realizing the correction of the optical display parameter. The embodiment of the application firstly establishes the fine mapping relationship between the driving gray scale value and the tristimulus value of each color sub-pixel of the photoelectric display screen, combines the preset test condition, performs optical measurement and uniform chroma space conversion on each color sub-pixel, accurately determines the target light chroma by using the minimum chroma distance criterion, and avoids the problem that the target value cannot be realized caused by the mean value or the centroid in the prior art; then based on the traversal search and the mapping inverse calculation, the target light chroma is inversely calculated to obtain a candidate combination set conforming to the actual sub-pixel driving gray scale discrete characteristics, and the candidate combination set is gradually screened and compared by combining multiple conditions such as the brightness deviation, the chroma deviation and the optimization threshold, and finally the optimal target driving gray scale combination is locked; finally, the combination is mapped as the driving control parameter and output to the display screen, realizing the double fine compensation of the brightness and the chroma, and effectively improving the optical display parameter correction precision under the conditions of the low gray scale and the full color gamut, and significantly improving the light chroma uniformity of the whole screen. BRIEF DESCRIPTION OF DRAWINGS

[0064] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments of the application. For those skilled in the art, other drawings can also be obtained without creative labor on the premise that these drawings are within the protection scope of the application.

[0065] Figure 1 is the overall flow diagram of the optical display parameter correction method of the photoelectric display screen in the embodiment 1 of the application;

[0066] Figure 2 is the flow diagram of calculating the driving gray scale combination of each color sub-pixel of each pixel on the photoelectric display screen under the test condition and determining the target driving gray scale combination in the embodiment 1 of the application;

[0067] Figure 3 is the structure diagram of the optical display parameter correction device of the photoelectric display screen in the embodiment 2 of the application;

[0068] Figure 4 Fig. 3 is a structural schematic diagram of an optical display parameter correction device of the photoelectric display screen in Embodiment 3 of the present application. DETAILED DESCRIPTION

[0069] The features and exemplary embodiments of various aspects of the present application will be described below in detail, in order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present application, and are not configured to limit the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0070] It should be noted that, in this paper, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the elements defined by the statement "include" do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0071] It should be noted that all the actions of acquiring signals, information or data in the present application are carried out in accordance with the corresponding data protection regulations and policies of the place, and with the authorization given by the owner of the corresponding device.

[0072] Embodiment 1

[0073] Please refer to Figure 1 The present application provides a photoelectric display screen optical display parameter correction method, the method comprises:

[0074] Obtaining the mapping relationship between the driving gray scale value and the corresponding tristimulus value of each color sub-pixel in each pixel of the photoelectric display screen;

[0075] Specifically, one pixel is usually composed of three color sub-pixels of red, green and blue, and the brightness of each color sub-pixel can be independently adjusted. The driving gray scale value refers to the digital signal level used to drive the display unit, usually between 0 and 255. The tristimulus value is defined by the International Commission on Illumination (CIE) as three physical quantities X, Y and Z, which are used to completely describe the brightness and chromaticity characteristics perceived by the human eye. The purpose of this step is to establish an accurate mapping relationship between the pixel driving signal and the actual optical output, and to provide a true physical basis for subsequent brightness and chromaticity back calculation. In the implementation process, the target color space and the gray scale set to be measured are first set, and the display screen is driven to display test pictures of different gray scale values of full white in turn. An imaging brightness and chromaticity meter is used to collect images of the test pictures, measure the tristimulus values of each color sub-pixel in the test pictures, and perform noise filtering, geometric correction and device calibration on the measurement data. Finally, the tristimulus values of each sub-pixel at each gray scale are stored in a lookup mapping table corresponding to the driving gray scale value, and the mapping relationship is obtained, thereby completely reflecting the nonlinear response characteristics of the display screen at different gray scales, avoiding significant errors in the low gray scale range when fitting with only a small number of gray scales, and laying a foundation for subsequent accurate correction of chromaticity and brightness.

[0076] According to the brightness and chromaticity distribution characteristics of each color sub-pixel in the correction picture under the preset test condition, the target brightness and chromaticity are determined, wherein the preset test condition includes setting the driving gray scale value to the target gray scale value and setting the correction picture color type to the target color type.

[0077] Specifically, the preset test condition refers to the specific input parameters set for the display screen during testing, including the target gray scale value and the target display color. The brightness and chromaticity distribution characteristics refer to the distribution of brightness and chromaticity of different pixels or sub-pixels in the correction picture, which can be described by indicators such as mean, variance and minimum value. The target brightness and chromaticity refer to the brightness and chromaticity combination values that the entire screen should reach after correction. The tristimulus values of each sub-pixel in the correction picture are converted to a uniform chromaticity space (such as CIE1976), the distance between them and the chromaticity of the equal-energy white light is calculated, and the point with the smallest distance is found as the chromaticity reference, while the corresponding brightness value is recorded. For white pictures, the tristimulus values of RGB sub-pixels are combined and then the target chromaticity and brightness are calculated. Finally, the target brightness and chromaticity of the entire screen are determined within the allowed deviation interval of the target value, ensuring that the driving combination calculated subsequently can truly achieve the target color and brightness, and maximize the consistency of the brightness and chromaticity of the entire screen.

[0078] According to the mapping relationship, the target brightness and chromaticity, and the brightness and chromaticity deviation allowed interval corresponding to the test condition, the driving gray scale combination of each color sub-pixel of each pixel on the optoelectronic display screen under the test condition is calculated to determine the target driving gray scale combination.

[0079] Specifically, the allowed interval of luminance deviation is a tolerance range between the target luminance and the actual luminance, and the driving gray scale combination refers to the combination of gray scale values of RGB sub-pixels in a pixel. Under the premise of considering the physical limitations of pixels and the target tolerance, the feasible driving signal combination closest to the target luminance is found. First, based on the mapping relationship, a candidate combination set is generated in the RGB gray scale space. Each candidate combination is mapped to the tristimulus value of the pixel and its luminance is calculated. The deviation is compared with the target luminance, and the combinations falling within the allowed interval of luminance deviation are screened out. Then, the combination with the smallest luminance and chrominance deviation is selected as the final target driving gray scale combination from these combinations. If necessary, algorithms such as branch and bound, stepwise traversal or heuristic search can be used to improve the calculation efficiency, to ensure that the output driving signal can be realized and is closest to the target value, and to significantly improve the correction accuracy of the full screen and low gray scale area.

[0080] According to the target driving gray scale combination, the driving control parameters of the optoelectronic display screen are adjusted, and the adjusted driving control parameters are output to the optoelectronic display screen to realize the correction of the optical display parameters.

[0081] Specifically, the driving control parameters refer to the parameter set used by the display screen control system to generate pixel driving signals, such as LUT lookup table, gain coefficient, bias value, etc. The calculation results are applied to the display screen hardware control layer to realize persistent and effective luminance and chrominance correction. The target driving gray scale combination is converted into a correction lookup table and written into the driving IC or image processing unit of the display screen, so that all subsequent input image signals can be output according to the new driving parameters after mapping processing. At the same time, re-measurement after correction can be performed to verify the effect, and secondary fine tuning or periodic re-calibration can be performed according to the need, to convert the theoretical optimization scheme into a hardware executable configuration, so that the display screen can maintain high luminance uniformity and color performance in long-term operation, and reduce the performance degradation caused by aging or environmental changes.

[0082] In an embodiment, the mapping relationship between the driving gray scale values and the corresponding tristimulus values of each color sub-pixel in each pixel on the optoelectronic display screen comprises:

[0083] A preset target color space and a set of driving gray scale values of color channels in the target color space are obtained;

[0084] Specifically, the target color space refers to a standard color system that the display system needs to achieve, such as a standard red-green-blue color system, which specifies the theoretical display range and brightness level of each color channel. The set of drive gray scale values is the corresponding different brightness or signal level of each color channel, such as 256 gray scale values from dark to light. The purpose of this step is to provide basic data for subsequent color response measurement of the display screen, ensuring a clear correspondence between the drive signal and the theoretical color output, obtaining the target color space parameters by referring to the display specification or color management software, and generating a complete list of gray scale values for each color channel and storing it as test input, which can ensure the integrity and systematicness of the measurement and calibration data, laying a foundation for subsequent gray scale response analysis, thereby improving the accuracy and consistency of display color reproduction.

[0085] controlling the optoelectronic display screen to display a test picture of full white with different gray scale values according to each drive gray scale value in the set of drive gray scale values;

[0086] Specifically, the test picture of full white refers to the simultaneous lighting of the red, green, and blue color channels to form a uniform white display state. The actual optical response of the display screen at each gray scale value is obtained, providing basic data for establishing the mapping relationship between the drive signal and the display output. The display control system sends different gray scale value signals to the display screen in turn while keeping the ambient light fixed and the display stable. The display state is recorded each time the gray scale value is switched, and the test picture is ensured to cover the entire screen to reduce measurement errors. Through this step, the gray scale output range of the display can be fully covered, ensuring continuous and complete measurement data, thereby providing accurate raw data for color calibration and gray scale adjustment, and improving the overall display quality of the display.

[0087] acquiring, by an imaging luminance colorimeter, a measurement result of tristimulus values of each color sub-pixel in each pixel under different gray scale values through image acquisition and measurement on the test picture;

[0088] Specifically, the imaging luminance colorimeter is a two-dimensional measurement device with a lens that takes a photo of the entire optical display screen at a time and gives brightness and chrominance information for each camera pixel. The imaging luminance colorimeter usually has a built-in calibrated spectral sensitivity matrix or XYZ filter, which converts the sensor response into tristimulus values X, Y, and Z. The test picture here is a full white test picture displayed on the optical display screen, which is driven by multiple gray scale values. Under the condition of displaying the full white test picture and being driven by different gray scale values, the imaging luminance colorimeter can simultaneously acquire the luminosity distribution of the entire full white test picture and measure the tristimulus values of each color sub-pixel under different gray scale values to obtain the measurement result. In this way, the optical output characteristics of the display screen under different gray scale input conditions can be recorded completely, thereby providing basic data support for subsequent analysis of the brightness uniformity and chrominance consistency of the picture.

[0089] Correlate and match the three-stimulus value measurement result and the corresponding driving gray scale value to determine the mapping relationship.

[0090] Specifically, the mapping relationship refers to the corresponding functional relationship between the driving gray scale value and the display output three-stimulus value. Through the establishment of the relationship, the display output color can be predicted or corrected inversely. The purpose of this step is to complete the accurate corresponding analysis of the input signal and the display output, and to provide a basis for color calibration and gray scale control. In the implementation process, curve fitting, interpolation or lookup table method can be used to save the three-stimulus value corresponding to each gray scale value, and the relationship between the three-stimulus value of the sub-pixel and the color scale is as follows:

[0091] {X C-measured,g (i,j), Y C-measured,g (i,j), Z C-measured,g (i,j)

[0092] Where i, j represent the pixel where the sub-pixel is located as the i-th row and j-th column pixel on the display screen; C represents color, for sub-pixel color, C takes R, G or B; for picture color, C takes R, G, B, W; C-measured represents the measured value of the sub-pixel; g is the gray scale of the measured full white picture, i.e. the color scale of a single sub-pixel, g ∈ {0, 1, 2, …, 255}. Nonlinear deviation or abnormal points are processed according to the measurement results. Through this step, the color output of the display at any gray scale can be accurately controlled, the gray scale smoothing, color restoration accuracy and display consistency are improved, and reliable basis is provided for subsequent color management and display optimization.

[0093] In an embodiment, the target brightness includes:

[0094] According to the preset test condition and the mapping relationship, the target three-stimulus value of each color sub-pixel in the correction picture is obtained.

[0095] Specifically, first, according to the preset test condition, the target driving gray scale value and the corresponding picture color type of the correction picture are determined, and then the mapping relationship between the driving gray scale value and the three-stimulus value established in the foregoing is called to directly find the target three-stimulus value of each color sub-pixel in the correction picture at the target gray scale.

[0096] Determine whether the correction picture is a single-color correction picture or a non-single-color correction picture.

[0097] Specifically, a calibration screen refers to a display image pre-designed to achieve optical performance calibration of the display. In a monochrome calibration screen (such as a red screen), after calibration, the sub-pixel of each pixel mainly lights up the sub-pixel of that color (such as red), and the sub-pixels of the other two colors will not light up or light up slightly. A non-monochromatic calibration screen is a test screen that contains multiple color channel components at the same time, such as a full white screen, a grayscale stripe screen, or a composite color pattern, which is used to reflect the optical characteristics under the superposition or mixing of channels. The purpose of this step is to clarify the measurement and processing logic corresponding to different calibration screens: for monochrome screens, the brightness and chromaticity characteristics of a single color channel can be directly measured and corrected; for non-monochromatic screens, the overall output needs to be analyzed under the condition of channel superposition in order to obtain the target value and deviation under the coordination between channels, thereby supporting subsequent single-channel precise control and maintaining color accuracy when synthesizing multiple channels.

[0098] If the correction image is a monochrome correction image, converting each of the target tristimulus values ​​into a chromaticity coordinate value in a target uniform chromaticity space according to each of the target tristimulus values ​​and a preset target uniform chromaticity space;

[0099] Specifically, the target tristimulus value of each color sub-pixel is converted into the chromaticity coordinate value (u') in the target uniform chromaticity space using the following formula: C-measured,g (i,j),v' C-measured,g (i,j)):

[0100]

[0101] Among them, the target uniform chromaticity space refers to a color space that has been homogenized so that the perceived differences between colors are more consistent with the mathematical distance, such as the commonly used uniform color difference space. The chromaticity coordinate value is the specific position of each color in this space. The purpose of this step is to map the measured physical three stimulus values ​​to a unified and standardized color representation space, so as to facilitate comparison and analysis. During the implementation process, the color space conversion formula can be used to convert the three stimulus values ​​into coordinate values ​​under the uniform chromaticity space through mathematical calculation or table lookup, and correct abnormal measurement points. Technically, this step allows the outputs of sub-pixels of different colors to be analyzed and compared under a unified standard, reducing nonlinear effects and improving the accuracy of color evaluation and uniformity judgment.

[0102] Calculating a first chromaticity distance between the chromaticity coordinate corresponding to each color sub-pixel and a preset chromaticity coordinate of equal energy white light according to each of the chromaticity coordinate values;

[0103] Specifically, the first chromaticity distance D between the chromaticity coordinates corresponding to each color sub-pixel and the preset chromaticity coordinates of equal-energy white light is calculated according to the following formula: C-measured,g (i,j):

[0104]

[0105] The chromaticity distance refers to the mathematical distance between two colors in a uniform chromaticity space, which is used to quantify the degree of color difference or color deviation. The purpose of this step is to evaluate the degree of deviation of each color sub-pixel output from the ideal white light, thereby ensuring that the target chromaticity found is the chromaticity that all pixels can achieve through the mixing of their three sub-pixels. During the implementation process, the Euclidean distance or other color difference calculation formula can be used to compare the chromaticity coordinates of each sub-pixel with the standard equienergetic white light coordinates to obtain the chromaticity distance value, and all calculation results are recorded for sorting and analysis.

[0106] Determining a first chromaticity distance set corresponding to each color channel sub-pixel according to each of the first chromaticity distances;

[0107] Determining, according to a color type corresponding to the monochrome correction image, a target color channel sub-pixel corresponding to the color type;

[0108] Specifically, when determining the first chromaticity distance set corresponding to each color channel subpixel based on each of the first chromaticity distances, it is first necessary to clarify the meaning of the first chromaticity distance, namely, the Euclidean distance between the chromaticity coordinates of a single subpixel and the preset chromaticity coordinates of isoenergetic white light. The resulting distance set reflects the degree of color deviation of all subpixels in the same color channel relative to the white light reference. Based on the color type corresponding to the monochrome calibration image (for example, a red calibration image corresponds to the red channel), the target color channel subpixels that match this color type are screened from the measurement results.

[0109] Obtaining a target chromaticity distance set corresponding to a target color channel sub-pixel according to the first chromaticity distance set;

[0110] Comparing the target chromaticity distances in the target chromaticity distance set, and taking the chromaticity coordinates of the color sub-pixel corresponding to the minimum target chromaticity distance as the target chromaticity coordinates;

[0111] Specifically, after the target color channel is screened, the data corresponding only to the sub-pixels of the target color channel is extracted from the first chromaticity distance set of that channel to form a target chromaticity distance set. In this way, all target chromaticity distances in the target chromaticity distance set are compared one by one to find the smallest one. The pixel corresponding to the smallest chromaticity distance is used to ensure that the target chromaticity found is the chromaticity that all pixels can achieve through the mixed light of their three sub-pixels. The chromaticity coordinates of this sub-pixel are determined as the target chromaticity coordinates of the color.

[0112] Comparing the brightness values ​​of the target three stimulus values, and taking the minimum brightness value as the target brightness value;

[0113] Specifically, finally, in addition to the selection of chromaticity coordinates, the target value needs to be given on the brightness level. Among all the target tristimulus values, the minimum brightness value is taken as the target brightness value, because the minimum brightness value can avoid distortion or nonlinear response caused by local brightness being too high, and it is more beneficial to maintain overall consistency and dynamic range in chromaticity correction. Through this series of processes, the final target chromaticity coordinates and target brightness value are obtained, which not only ensures that the target chromaticity found is the chromaticity that all pixels can achieve through the mixing of light of their three sub-pixels, but also takes into account the stability of brightness, thereby providing a reliable reference target for subsequent display correction.

[0114] According to the target chromaticity coordinates and the target brightness value, the target bright chromaticity is determined.

[0115] Specifically, the target bright chromaticity refers to the standard bright chromaticity that the display screen needs to achieve under certain color conditions, for example, for a g color step C color type correction picture, its target bright chromaticity is:

[0116]

[0117] The purpose of this step is to integrate chromaticity and brightness information to obtain the final calibrated bright chromaticity value, which provides the basis for display brightness adjustment and white light display optimization. In the implementation process, the corresponding bright chromaticity value can be determined through the brightness calculation formula or lookup table in combination with the target chromaticity coordinates and brightness value, while considering the nonlinear response of the display and environmental factors for fine tuning, to ensure that the display screen displays bright colors accurately and uniformly in brightness, thereby improving the visual experience and ensuring that the display output meets the preset standards, facilitating subsequent color management and display optimization.

[0118] In an embodiment, after determining that the correction picture is a single-color correction picture or a non-single-color correction picture, the method further comprises:

[0119] If the correction picture is a non-single-color correction picture, the target tristimulus values of each color channel sub-pixel in the non-single-color correction picture are calculated to obtain each synthesized tristimulus value.

[0120] Specifically, the synthesized tristimulus value refers to the tristimulus vector output by the entire pixel in a non-single-color correction picture with multiple color channels lit at the same time, which can be understood as the sum of the light output of the red, green and blue sub-pixels to the pixel under the current driving. The purpose is to obtain the real optical output of the screen in the actual multi-channel display state, thereby providing real candidate data for chromaticity and brightness target selection. For example, taking a white correction picture as an example, the synthesized tristimulus value of the pixel is calculated by the following formula: {Y W-measured,g (i,j)、Y W-measured,g (i,j)、Z W-measured,g (i,j)}:

[0121] X W-measured,g (i,j) = X R-measured,g (i,j) + X G-measured,g (i,j) + X B-measured,g (i,j),

[0122] Y W-measured,g (i,j) = Y R-measured,g (i,j) + Y G-measured,g (i,j) + Y B-measured,g (i,j),

[0123] Z W-measured,g (i,j) = Z R-measured,g (i,j) + Z G-measured,g (i,j) + Z B-measured,g (i,j)

[0124] converting each of the resultant tristimulus values into corresponding resultant chrominance coordinates in the target uniform chrominance space, and calculating a second chrominance distance between each of the resultant chrominance coordinates and a preset equal-energy white light chrominance coordinate;

[0125] Specifically, the resultant chrominance coordinates, i.e., the resultant tristimulus values of pixels in a white correction picture, such as {X W-measured,g (i,j), Y W-measured,g (i,j), and Z W-measured,g (i,j)}, are converted into corresponding resultant chrominance coordinates in the target uniform chrominance space through conversion. The purpose is to convert the resultant tristimulus values into a chrominance representation closer to human eye perception, so as to measure the closeness of the resultant color to the target white point by using a single scalar, calculate the second chrominance distance between each of the resultant chrominance coordinates and the preset equal-energy white light chrominance coordinate, quantify the resultant color difference as a distance index consistent with visual consistency, facilitate cross-position and cross-gray-scale comparison and sorting, and ensure that the chrominance determination is based on human eye perception rather than original spectral values.

[0126] The second chrominance distances are compared, and the resultant chrominance coordinate corresponding to the smallest second chrominance distance is taken as the target chrominance coordinate.

[0127] The luminance values in each of the resultant tristimulus values are compared, and the smallest luminance value is taken as the target luminance value.

[0128] Specifically, the second chrominance distances are compared, and the resultant chrominance coordinate corresponding to the smallest second chrominance distance is taken as the target chrominance coordinate. The luminance values in each of the resultant tristimulus values are compared, and the smallest luminance value is taken as the target luminance value, for example, the target white chrominance is:

[0129]

[0130] In an embodiment, referring to Figure 2 , the target driving gray scale combination is determined by calculating each color sub-pixel driving gray scale combination of each pixel on the photoelectric display screen under the test condition according to the mapping relationship, the target lightness and the lightness deviation allowed interval corresponding to the test condition, comprising:

[0131] combining the driving gray scale values of each color sub-pixel of each pixel on the photoelectric display screen under the test condition to obtain a candidate combination set of each color sub-pixel driving gray scale combination;

[0132] Specifically, the driving gray scale value is an input signal for controlling the brightness of the color sub-pixel of the display screen, and the combination refers to generating possible driving schemes according to different arrangements of the gray scale values of the red, green and blue sub-pixels of each pixel. The purpose of this step is to build a complete set of possible driving schemes to provide input data for subsequent calculation of display output and lightness under each combination. In the implementation process, the gray scale value sequence of each sub-pixel can be arranged and combined to generate a candidate combination table or array, and each record contains the gray scale values of the three sub-pixels under this combination, thereby covering all possible driving states of the display screen, providing a complete candidate basis for selecting the optimal driving scheme, and ensuring the accuracy of subsequent brightness and color optimization.

[0133] According to the mapping relationship, the tristimulus values of each color sub-pixel corresponding to each driving gray scale combination in the candidate combination set are synthesized to obtain pixel synthesis tristimulus values corresponding to each driving gray scale combination;

[0134] Specifically, the mapping relationship refers to the corresponding function or lookup table relationship between the gray scale driving value and the optical output tristimulus value; the tristimulus value of the pixel located at (i,j) is synthesized by the tristimulus values of its sub-pixels. Taking the red correction picture with driving gray scale g as an example, the same principle is applied to the correction pictures of other color types for lightness and color correction. In the red correction picture with driving gray scale g, the color steps of the R, G and B sub-pixels are g m , g n and g l , respectively. Then the tristimulus values of the pixel composed of these three sub-pixels are , respectively.

[0135]

[0136] The synthetic tristimulus value is the color of the pixel as a whole output by mixing the tristimulus values of the red, green and blue sub-pixels according to the color mixing rule. The purpose of this step is to predict the tristimulus value of the actual output of the pixel by the candidate combination of gray scale values, and to provide input for the calculation of the lightness. In the implementation process, the mapping table or the fitting function can be used to convert the candidate gray scale values into the tristimulus values of each sub-pixel, and then the tristimulus value of the whole pixel is calculated by weighting or the standard synthesis formula. Technically, this step can efficiently predict the output effect of the pixel under different driving combinations without the need for actual display measurement each time, thereby saving test time and improving calculation efficiency.

[0137] According to the synthetic tristimulus value of each pixel, the lightness of each driving gray scale combination is calculated to obtain a test lightness, wherein the test lightness includes a test brightness value and a test chroma coordinate.

[0138] Specifically, according to the synthetic tristimulus value of each pixel, the lightness of each driving gray scale combination is calculated by the following formula to obtain the test lightness

[0139]

[0140] The lightness refers to the comprehensive representation of the optical brightness and the color coordinate of the pixel under a specific color, including the brightness value and the chroma coordinate. The purpose of this step is to convert the synthetic tristimulus value into a quantifiable display characteristic index, so as to compare with the target lightness. In the implementation process, the standard color space conversion formula can be used to map the synthetic tristimulus value of the pixel to the uniform chroma space, extract the brightness component and the chroma coordinate, and obtain the test lightness corresponding to each driving combination. Technically, this step can accurately reflect the influence of the candidate driving combination on the display output, and provide an operable data basis for the subsequent deviation calculation and screening.

[0141] The deviation of each test lightness and the target lightness is calculated to obtain a lightness deviation value.

[0142] Specifically, the deviation of each test lightness and the target lightness is calculated by the following formula to obtain the brightness deviation and the chroma deviation

[0143]

[0144] ​The bright chrominance deviation value refers to the difference between the candidate driving combination output and the target bright chrominance, including the brightness difference and the chrominance difference. The purpose of this step is to quantify the difference between each driving combination and the target display effect, providing a basis for screening the optimal combination. In the implementation process, the test bright chrominance and the target bright chrominance can be calculated by difference, and the brightness difference and the chrominance difference can be combined to form a comprehensive deviation value, which is recorded in the candidate combination data. Technically, this step can directly compare the display performance with the target standard, providing accurate indicators for subsequent screening and optimization, and improving the scientific nature of selecting the driving combination.

[0145] According to the bright chrominance deviation value and the bright chrominance deviation allowable interval, each driving gray scale combination in the candidate combination set is screened to obtain a candidate combination subset whose bright chrominance deviation value is within the bright chrominance deviation allowable interval;

[0146] Specifically, the bright chrominance deviation allowable interval refers to the acceptable brightness and color deviation range of the system. The purpose of this step is to screen the driving combination that meets the display standard requirements and exclude combinations with too large deviation. In the implementation process, the deviation values of the candidate combinations can be compared, and only the combinations within the allowable interval are retained to form a subset as the basis for further optimization. Technically, this step can ensure that the finally selected driving combination output is stable and close to the target bright chrominance, improving the brightness and color uniformity of the display, and at the same time, reducing the search range and improving the calculation efficiency.

[0147] The bright chrominance deviation values corresponding to each driving gray scale combination in the candidate combination subset are compared, and according to the comparison result, the target driving gray scale combination is determined.

[0148] Specifically, the purpose of this step is to select the optimal combination from the screened candidate combinations, so that the display output is closest to the target bright chrominance. In the implementation process, the deviation values of the candidate combination subset can be sorted or compared one by one, and the combination with the smallest deviation is selected as the final target driving gray scale combination, and the corresponding red, green and blue sub-pixel gray scale values are recorded. Technically, this step can accurately determine the driving scheme, so that the display reaches the best brightness and color consistency under the target bright output, ensuring the optimal visual effect and meeting the calibration standard.

[0149] In an embodiment, the combining the driving gray scale values of each color sub-pixel of each pixel on the optoelectronic display screen under the test condition to obtain a candidate combination set of each color sub-pixel driving gray scale combination comprises:

[0150] According to the preset test condition and the gray scale range corresponding to the target color channel, initial driving gray scale values are set for the first color sub-pixel, the second color sub-pixel and the third color sub-pixel of different color channels respectively, to obtain a traversal starting gray scale value set;

[0151] Specifically, the initial driving gray scale value refers to the starting point of the gray scale signal set for each color sub-pixel at the beginning of the test, which is located within a preset gray scale range. For example, the first color sub-pixel can start from a gray scale value of 50, the second color sub-pixel from 60, and the third color sub-pixel from 40. According to the preset test conditions and the corresponding gray scale range of the target color channel, the initial driving gray scale values of the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel of different color channels are set respectively to obtain a set of traversal starting gray scale values, thereby providing a clear starting point for subsequent gray scale traversal and combination calculation, to ensure that the traversal process is complete and efficient. According to the target color channel range of the display and the test strategy, a reasonable initial gray scale value for each sub-pixel is selected and a set is formed, serving as the basis for driving gray scale traversal. Technically, this step ensures that the gray scale traversal starts from a reasonable range, avoiding unnecessary calculations and improving the efficiency and comprehensiveness of subsequent candidate combination generation.

[0152] According to the initial driving gray scale value of the first color sub-pixel and the preset gray scale step, the driving gray scale value of the first color sub-pixel is sequentially incremented to obtain a candidate set of driving gray scale values of the first color sub-pixel.

[0153] Specifically, the gray scale step refers to the interval of the gray scale value increased each time during the traversal process. For example, a step of 5 means that the initial gray scale value is increased by 5 each time until the maximum gray scale value is reached. The purpose of this step is to systematically generate all possible driving states of the first color sub-pixel within the test range, providing candidate data for combination calculation. In the implementation process, taking the red correction picture as an example, when performing lightness correction on the red correction picture, the initial gray scale value of the red sub-pixel should be used as the starting point, and the preset step should be increased to generate a complete candidate set, recording each gray scale value as subsequent combination input. This is because in the red correction picture, the red sub-pixel is the dominant channel that determines the overall brightness change, while the green and blue sub-pixels, although still possible to be lit, are auxiliary components for forming chroma and brightness. In the red correction picture, establishing a gray scale candidate set for the red sub-pixel and gradually increasing it can quickly lock the main influencing factors, enabling subsequent combination adjustment with green and blue sub-pixels to be based on the red main channel. This not only reduces the range of repeated searches and avoids blind traversal among the three channels, but also improves the overall correction speed and efficiency. Technically, this step can comprehensively cover the driving range of the first color sub-pixel, providing a complete candidate basis for gray scale combination optimization, ensuring that the final selected driving combination can achieve the target lightness and color accuracy.

[0154] On the basis of the candidate set of driving gray scale values of the first color sub-pixel, according to the initial driving gray scale value of the second color sub-pixel and the preset gray scale step, the driving gray scale value of the second color sub-pixel is sequentially incremented to obtain a candidate set of driving gray scale values of the second color sub-pixel.

[0155] Specifically, after the first color sub-pixel candidate range is determined, independent gray scale candidate values are generated for the second color sub-pixel, ensuring that all possibilities of red-green color combinations are covered. In the implementation process, the complete candidate set can be generated by starting from the initial gray scale value of the second color sub-pixel and increasing by a preset step size, and the combination table or array is formed with the first color sub-pixel candidate set for subsequent combination generation. Technically, this step can ensure the comprehensiveness and systematicness of the red-green channel gray scale combination, improve the coverage rate of the final candidate combination, and provide a basis for accurately adjusting the brightness and chrominance of white light or multi-color display.

[0156] On the basis of the combination of the first color sub-pixel and the second color sub-pixel driving gray scale value candidate set, the third color sub-pixel driving gray scale value is sequentially increased according to the initial driving gray scale value of the third color sub-pixel and the preset gray scale step size, and the third color sub-pixel driving gray scale value candidate set is obtained;

[0157] Specifically, the third color sub-pixel driving gray scale value candidate set is a set of possible gray scale values generated in the traversal process. The purpose of this step is to complete the generation of three-color channel gray scale candidates and provide complete three-channel data for the final candidate combination. In the implementation process, the complete candidate set can be generated by starting from the initial gray scale value of the third color sub-pixel and increasing by a preset step size. Technically, this step can ensure that the gray scale traversal of the three-color sub-pixel fully covers all possible states, provide complete data support for driving combination optimization and brightness and chrominance calibration, and improve the accuracy of white light or bright color display of the display.

[0158] According to the first color sub-pixel driving gray scale value candidate set, the second color sub-pixel driving gray scale value candidate set, and the third color sub-pixel driving gray scale value, the driving gray scale values of each color sub-pixel are combined to obtain the candidate combination set.

[0159] Specifically, the candidate combination set refers to the complete set of all possible driving schemes formed by the combination of three-color channel gray scale values. The purpose of this step is to build a complete gray scale driving combination to provide input data for subsequent brightness and chrominance calculation, deviation analysis, and optimal combination selection. In the implementation process, the red, green, and blue candidate sets can be combined by Cartesian product to generate a complete set containing the red, green, and blue gray scale values of each combination, and recorded as a candidate combination table. Technically, this step can ensure that the gray scale combination is fully covered and has strong systematicness, providing a reliable basis for display driving optimization, so that the finally determined driving combination can accurately achieve the target brightness and chrominance, and improve the consistency and color accuracy of the display effect.

[0160] In an embodiment, the synthesizing, according to the mapping relationship, the three stimulus values of each color sub-pixel corresponding to each driving gray scale combination in the candidate combination set to obtain the pixel synthesis three stimulus values corresponding to each driving gray scale combination comprises:

[0161] obtaining a first driving gray scale value of a first color sub-pixel, a second driving gray scale value of a second color sub-pixel and a third driving gray scale value of a third color sub-pixel in each of the driving gray scale combinations;

[0162] Specifically, the driving gray scale value is an input signal for controlling the brightness of the color sub-pixel of the display screen, for example, the first color sub-pixel gray scale value can be 80, the second color sub-pixel gray scale value can be 75, and the third color sub-pixel gray scale value can be 60. The purpose of this step is to extract the specific gray scale value of each color sub-pixel from the candidate gray scale combination, to provide basic input for subsequent color output calculation. In the implementation process, each combination of red, green and blue sub-pixel gray scale values can be read in turn by traversing the candidate combination set, and stored as independent variables or arrays for subsequent mapping processing. Technically, this step can accurately locate the driving state of each color sub-pixel, providing accurate input data for three-stimulus value calculation, and ensuring the reliability of display brightness and color analysis.

[0163] According to the mapping relationship, the first driving gray scale value, the second driving gray scale value and the third driving gray scale value are respectively mapped to obtain a first color sub-pixel three-stimulus value, a second color sub-pixel three-stimulus value and a third color sub-pixel three-stimulus value;

[0164] Specifically, the mapping relationship refers to the corresponding function or lookup table relationship between the gray scale value and the three-stimulus value of the optical output of the color sub-pixel, for example, the gray scale value 100 corresponds to the first color sub-pixel three-stimulus value X, Y and Z. The purpose of this step is to convert the electrical input (gray scale value) into optical output (three-stimulus value) to quantify the optical performance of each color sub-pixel. In the implementation process, the gray scale-three-stimulus value mapping table or fitting function established in advance can be used to map each sub-pixel gray scale value to the corresponding three-stimulus value, and necessary outlier correction can be performed. Technically, this step can convert the gray scale driving signal into an analyzable optical parameter, providing an accurate basis for pixel brightness and color calculation, and improving the accuracy of subsequent calibration and optimization.

[0165] Summing the first color sub-pixel three-stimulus value, the second color sub-pixel three-stimulus value and the third color sub-pixel three-stimulus value to obtain the pixel synthesis three-stimulus value;

[0166] Specifically, the purpose of this step is to combine the optical outputs of individual color sub-pixels into the optical performance of the entire pixel to simulate the actual display effect. In the implementation process, the three-stimulus values corresponding to the color sub-pixels of the three color channels are summed to obtain the pixel-level pixel synthesis three-stimulus value. Technically, this step can truly reflect the comprehensive optical output of each pixel of the display screen, providing reliable data for subsequent brightness calculation and deviation analysis, and improving the accuracy of color synthesis of the display.

[0167] In an embodiment, the luminance deviation values corresponding to each driving gray scale combination in the candidate combination set are compared, and according to the comparison result, the target driving gray scale combination is determined to include:

[0168] According to the luminance deviation values, it is judged whether the luminance deviation values meet a preset luminance preferred threshold condition;

[0169] Specifically, the luminance deviation value refers to the difference between the luminance of the pixel output by the candidate driving gray scale combination and the target luminance, and the luminance preferred threshold condition is a preset acceptable deviation range, for example, ±2 units of luminance. The purpose of this step is to screen out candidate combinations that meet the luminance accuracy requirement, providing a basis for subsequent preferred sorting. In the implementation process, the luminance deviation values of each candidate combination are compared one by one, and the combinations within the threshold range are recorded as qualified combinations. Technically, this step can ensure that the finally selected driving combination can meet the luminance requirement, reduce the luminance deviation of the display output, improve the display consistency and the stability of the visual effect.

[0170] Among the driving gray scale combinations that meet the luminance preferred threshold condition, the luminance deviation values between the luminance of the pixel synthesized by each color sub-pixel and the target luminance are compared, and a first preferred combination with the smallest luminance deviation value is obtained;

[0171] Specifically, among the candidate driving gray scale combinations that have met the luminance preferred threshold, for each candidate driving gray scale combination, the entire pixel luminance deviation after light mixing is calculated, that is, the difference between the luminance value of the pixel after the synthesis of the red, green and blue channels and the target pixel luminance, and the driving gray scale combination with the smallest light mixing luminance deviation is selected as the first preferred combination. This process calculates the difference between the entire pixel luminance after light mixing and the target luminance as the core index for the final comparison for each candidate combination, ensuring that the final result is consistent with the light mixing output luminance, thereby obtaining the first preferred combination with the smallest luminance deviation and the optimal visual effect.

[0172] Among the driving gray scale combinations corresponding to the first preferred combination, the chroma deviation values of each driving gray scale combination are compared according to the comparison chroma deviation value rule, and a second preferred combination with the smallest chroma deviation value is obtained;

[0173] Specifically, the chroma deviation value refers to the difference between the chroma of the pixel of the candidate combination and the target chroma, and the second preferred combination is a combination that further optimizes the color accuracy on the basis of ensuring the green brightness preference. The purpose of this step is to further optimize the closeness of the display output color to the target through chroma preference after the brightness meets the preferred condition. In the implementation process, the chroma deviation value can be calculated for the candidate combination corresponding to the first preferred combination, and the one with the smallest deviation is selected as the second preferred combination. Technically, this step can optimize the accuracy of the display color on the premise of ensuring the brightness accuracy, and improve the accuracy and consistency of the overall color performance of the display.

[0174] According to the driving gray scale combination corresponding to the second preferred combination, the target driving gray scale combination is determined.

[0175] Specifically, the target driving gray scale combination is the final selected red, green and blue sub-pixel gray scale value combination, which is used to display the display effect closest to the target brightness and chroma. The purpose of this step is to land the preferred sorting result as an actual driving scheme, and to provide a final reference value for display calibration or display control. In the implementation process, the gray scale values of the red, green and blue sub-pixels in the second preferred combination can be directly read and recorded as the target driving combination. Technically, this step can ensure that the display output reaches the comprehensive optimal state of brightness and chroma, improve the display uniformity, color accuracy and visual consistency, and at the same time provide a reliable basis for subsequent driving control.

[0176] Embodiment 2

[0177] Please refer to Figure 3 The embodiment of the present application provides an optical display parameter correction device of a photoelectric display screen, the device comprises:

[0178] A mapping relationship acquisition module is configured to acquire a mapping relationship between the driving gray scale values and the corresponding tristimulus values of each color sub-pixel in each pixel on the photoelectric display screen.

[0179] A target brightness chroma determination module is configured to determine a target brightness chroma according to the brightness chroma distribution characteristics of each color sub-pixel in the correction picture under a preset test condition, wherein the preset test condition comprises that the driving gray scale value is set as a target gray scale value and the color type of the correction picture is set as a target color type.

[0180] A target driving gray scale combination module is configured to calculate the driving gray scale combination of each color sub-pixel of each pixel on the photoelectric display screen under the test condition according to the mapping relationship, the target brightness chroma and a brightness chroma deviation allowed interval corresponding to the test condition, and determine a target driving gray scale combination.

[0181] The drive control parameter adjustment module is used to adjust the drive control parameters of the optoelectronic display screen according to the target drive grayscale combination, and output the adjusted drive control parameters to the optoelectronic display screen to achieve correction of optical display parameters.

[0182] It should be noted that the modules and units in the optical display parameter correction device of the photoelectric display screen in this embodiment correspond one-to-one to the steps in the optical display parameter correction method of the photoelectric display screen in the aforementioned embodiment. Therefore, the specific implementation of this embodiment can refer to the implementation of the optical display parameter correction method of the aforementioned photoelectric display screen, and will not be repeated here.

[0183] Example 3

[0184] In addition, combined Figure 1 The optical display parameter correction method of the optoelectronic display screen according to the embodiment of the present invention can be implemented by an optical display parameter correction device of the optoelectronic display screen. Figure 4 The figure shows a hardware structure diagram of an optical display parameter correction device for a photoelectric display screen provided by an embodiment of the present invention.

[0185] The optical display parameter correction device of the optoelectronic display screen may include a processor and a memory storing computer program instructions.

[0186] Specifically, the processor may include a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits for implementing the embodiments of the present invention.

[0187] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0188] Computer-readable media includes permanent and non-permanent, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to a computing device. According to the definition herein, computer readable media does not include transitory media such as modulated data signals and carriers.

[0189] The processor implements the optical display parameter correction method of any one of the above embodiments by reading and executing computer program instructions stored in the memory.

[0190] In one example, the optical display parameter correction device of the optoelectronic display screen can further include a communication interface and a bus. Wherein, as shown in Figure 4 The processor 401, the memory 402 and the communication interface 403 are connected through the bus 410 and complete communication with each other.

[0191] The communication interface is mainly used to realize the communication between the modules, devices, units and / or equipment in the embodiments of the application.

[0192] The bus includes hardware, software or both, which couples the components of the optical display parameter correction device of the optoelectronic display screen to each other. By way of example, and not limitation, the bus can include an accelerated graphics port (AGP) or other graphics bus, an enhanced industry standard architecture (EISA) bus, a front side bus (FSB), a hypertransport (HT) interconnect, an industry standard architecture (ISA) bus, an infiniband interconnect, a low pin count (LPC) bus, a memory bus, a microchannel architecture (MCA) bus, a peripheral component interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a serial advanced technology attachment (SATA) bus, a video electronics standards association local (VLB) bus, or other suitable bus or combination of two or more of these. Where appropriate, the bus can include one or more buses. Although the embodiments of the application are described and illustrated with a specific bus, the application contemplates any suitable bus or interconnect.

[0193] In summary, the present application provides a method, device and equipment for optical display parameter correction of photoelectric display screen.

[0194] It is to be understood that the application is not limited to the particular configurations and processes described hereinabove and shown in the drawings. For the sake of brevity, detailed descriptions of known methods and apparatuses are omitted. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present application are not limited to the specific steps described and shown, and one skilled in the art can make various changes, modifications and additions, or change the order of the steps, after understanding the spirit of the present application.

[0195] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, system or computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0196] The present application is described with reference to flowcharts and / or block diagrams of methods, apparatus (system) and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus produce a means for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 means for performing the functions specified in the flowcharts and / or block diagrams.

[0197] These computer program instructions can also be stored in a computer-readable memory that can direct the computer or other programmable data processing apparatus to work in a specific manner, so that the instructions stored in the computer-readable memory produce a product including instruction means, which implements the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 means for performing the functions specified in the flowcharts and / or block diagrams.

[0198] These computer program instructions can also be loaded into a computer or other programmable data processing apparatus, so that a series of operation steps are performed on the computer or other programmable data processing apparatus to produce a computer-implemented process, so that the instructions executed on the computer or other programmable data processing apparatus provide a means for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1one or more processes and / or blocks Figure 1 the steps of the functions specified in one or more blocks.

[0199] It should also be noted that the exemplary embodiments described herein are based on a series of steps or devices to describe some methods or systems. However, the present application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or different from the order in the embodiments, or several steps are performed simultaneously.

[0200] The above is only a specific implementation of the present application, and those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described system, module and unit can refer to the corresponding process in the foregoing method embodiments, which will not be described here. It should be understood that the protection scope of the present application is not limited to this, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application.

Claims

1. A method for correcting optical display parameters of a photoelectric display screen, characterized in that: The method comprises: Obtaining a mapping relationship between a driving grayscale value and a corresponding tristimulus value for each color sub-pixel in each pixel on an optoelectronic display screen; Determining target brightness and chromaticity based on brightness and chromaticity distribution characteristics of each color sub-pixel in the calibration image under preset test conditions, wherein the preset test conditions include setting the driving grayscale value to the target grayscale value and setting the calibration image color type to the target color type; calculating, based on the mapping relationship, the target brightness and chromaticity, and the brightness and chromaticity deviation tolerance corresponding to the test condition, a driving grayscale combination of each color sub-pixel of each pixel on the optoelectronic display screen under the test condition to determine a target driving grayscale combination; According to the target driving grayscale combination, the driving control parameters of the optoelectronic display screen are adjusted, and the adjusted driving control parameters are output to the optoelectronic display screen to achieve correction of optical display parameters.

2. The method for correcting optical display parameters of a photoelectric display screen according to claim 1, wherein: The step of obtaining a mapping relationship between a driving grayscale value of each color sub-pixel in each pixel on the photoelectric display screen and a corresponding tristimulus value includes: Obtaining a preset target color space and a set of driving grayscale values ​​of color channels in the target color space; According to each driving grayscale value in the driving grayscale value set, controlling the photoelectric display screen to display a full white test screen of different grayscale values; The test image is captured and measured using an imaging luminance and colorimeter to obtain tristimulus value measurement results of each color sub-pixel in each pixel at different grayscale values; The tristimulus value measurement results and the corresponding driving grayscale values ​​are correlated and matched to determine the mapping relationship.

3. The method for correcting optical display parameters of a photoelectric display screen according to claim 1, wherein: Determining the target brightness and chromaticity according to the brightness and chromaticity distribution characteristics of each color sub-pixel in the calibration image under the preset test conditions includes: Obtaining target tristimulus values ​​for each color sub-pixel in the calibration image according to the preset test conditions and the mapping relationship; Determine whether the calibration image is a monochrome calibration image or a non-monochrome calibration image; If the correction image is a monochrome correction image, converting each of the target tristimulus values ​​into a chromaticity coordinate value in a target uniform chromaticity space according to each of the target tristimulus values ​​and a preset target uniform chromaticity space; Calculating a first chromaticity distance between the chromaticity coordinate corresponding to each color sub-pixel and a preset chromaticity coordinate of equal energy white light according to each of the chromaticity coordinate values; Determining a first chromaticity distance set corresponding to each color channel sub-pixel according to each of the first chromaticity distances; Determining, according to a color type corresponding to the monochrome correction image, a target color channel sub-pixel corresponding to the color type; Obtaining a target chromaticity distance set corresponding to a target color channel sub-pixel according to the first chromaticity distance set; Comparing the target chromaticity distances in the target chromaticity distance set, and taking the chromaticity coordinates of the color sub-pixel corresponding to the minimum target chromaticity distance as the target chromaticity coordinates; Comparing the brightness values ​​of the target three stimulus values, and taking the minimum brightness value as the target brightness value; The target brightness chromaticity is determined according to the target chromaticity coordinates and the target brightness value.

4. The method for correcting optical display parameters of a photoelectric display screen according to claim 3, wherein: After determining whether the correction picture is a monochrome correction picture or a non-monochrome correction picture, the method further includes: If the correction image is a non-monochromatic correction image, calculating each synthetic tristimulus value according to the target tristimulus value of each color channel sub-pixel in the non-monochromatic correction image; Converting each of the synthesized tristimulus values ​​into a corresponding synthesized chromaticity coordinate in the target uniform chromaticity space, and calculating a second chromaticity distance between each synthesized chromaticity coordinate and a preset chromaticity coordinate of equal-energy white light; comparing the second chromaticity distances, and taking the composite chromaticity coordinate corresponding to the smallest second chromaticity distance as the target chromaticity coordinate; The brightness values ​​in the synthesized tristimulus values ​​are compared, and the minimum brightness value is used as the target brightness value.

5. The method for correcting optical display parameters of a photoelectric display screen according to any one of claims 1 to 4, characterized in that: The calculating, based on the mapping relationship, the target brightness and chromaticity, and the brightness and chromaticity deviation allowable range corresponding to the test condition, a driving grayscale combination of each color sub-pixel of each pixel on the optoelectronic display screen under the test condition to determine the target driving grayscale combination includes: Combining the driving grayscale values ​​of the sub-pixels of each color of each pixel on the electro-optical display screen under the test conditions to obtain a candidate combination set of driving grayscale combinations of the sub-pixels of each color; synthesizing the tristimulus values ​​of each color sub-pixel corresponding to each driving grayscale combination in the candidate combination set according to the mapping relationship to obtain pixel synthesized tristimulus values ​​corresponding to each driving grayscale combination; Calculating the brightness and chromaticity of each driving grayscale combination according to the synthesized tristimulus values ​​of each pixel to obtain each test brightness and chromaticity, wherein the test brightness and chromaticity include a test brightness value and a test chromaticity coordinate; Calculating the deviation between each of the test brightness and chromaticity and the target brightness and chromaticity to obtain a brightness and chromaticity deviation value; screening the driving grayscale combinations in the candidate combination set according to the brightness and chromaticity deviation value and the brightness and chromaticity deviation allowable range to obtain a subset of candidate combinations whose brightness and chromaticity deviation values ​​are within the brightness and chromaticity deviation allowable range; The brightness and chromaticity deviation values ​​corresponding to the driving grayscale combinations in the candidate combination subset are compared, and the target driving grayscale combination is determined according to the comparison result.

6. The method for correcting optical display parameters of a photoelectric display screen according to claim 5, characterized in that: The step of combining the driving grayscale values ​​of the sub-pixels of each color of each pixel on the electro-optical display screen under the test conditions to obtain a candidate combination set of driving grayscale combinations of the sub-pixels of each color includes: According to the preset test conditions and the grayscale range corresponding to the target color channel, initial driving grayscale values ​​are set for the first color sub-pixel, the second color sub-pixel, and the third color sub-pixel of different color channels to obtain a set of traversal starting grayscale values; According to the initial driving grayscale value of the first color sub-pixel and the preset grayscale step size, the driving grayscale values ​​of the first color sub-pixel are sequentially and incrementally traversed to obtain a candidate set of driving grayscale values ​​of the first color sub-pixel; On the basis of the first color sub-pixel driving grayscale value candidate set, according to the initial driving grayscale value of the second color sub-pixel and the preset grayscale step size, the second color sub-pixel driving grayscale value is sequentially and incrementally traversed to obtain the second color sub-pixel driving grayscale value candidate set; Based on the combination of the first color sub-pixel and the second color sub-pixel driving grayscale value candidate sets, the third color sub-pixel driving grayscale values ​​are sequentially and incrementally traversed according to the initial driving grayscale value of the third color sub-pixel and the preset grayscale step size to obtain a third color sub-pixel driving grayscale value candidate set; According to the first color sub-pixel driving grayscale value candidate set, the second color sub-pixel driving grayscale value candidate set and the third color sub-pixel driving grayscale value, the color sub-pixel driving grayscale values ​​are combined to obtain the candidate combination set.

7. The method for correcting optical display parameters of a photoelectric display screen according to claim 5, wherein: The step of synthesizing the tristimulus values ​​of each color sub-pixel corresponding to each driving grayscale combination in the candidate combination set according to the mapping relationship to obtain the pixel synthesized tristimulus value corresponding to each driving grayscale combination includes: Obtaining a first driving grayscale value of a first color sub-pixel, a second driving grayscale value of a second color sub-pixel, and a third driving grayscale value of a third color sub-pixel in each of the driving grayscale combinations; According to the mapping relationship, mapping processing is performed on the first driving grayscale value, the second driving grayscale value, and the third driving grayscale value to obtain a first color sub-pixel tristimulus value, a second color sub-pixel tristimulus value, and a third color sub-pixel tristimulus value; The pixel composite tristimulus value is obtained by summing the tristimulus value of the first color sub-pixel, the tristimulus value of the second color sub-pixel, and the tristimulus value of the third color sub-pixel.

8. The method for correcting optical display parameters of a photoelectric display screen according to claim 5, characterized in that: The comparing the brightness and chromaticity deviation values ​​corresponding to the driving grayscale combinations in the candidate combination subset and determining the target driving grayscale combination according to the comparison result includes: According to each of the brightness deviation values, determining whether the brightness deviation value meets a preset brightness preferred threshold condition; In the driving grayscale combinations that meet the brightness preferred threshold condition, comparing the brightness deviation between the brightness of the pixel synthesized by each color sub-pixel and the target brightness to obtain a first preferred combination with the smallest brightness deviation; Among the driving grayscale combinations corresponding to the first preferred combination, the chromaticity deviation values ​​of the driving grayscale combinations are compared according to the rule for comparing chromaticity deviation values, to obtain a second preferred combination with the smallest chromaticity deviation value; The target driving gray scale combination is determined according to the driving gray scale combination corresponding to the second preferred combination.

9. An optical display parameter correction device for a photoelectric display screen, characterized in that: The device comprises: A mapping relationship acquisition module is used to obtain the mapping relationship between the driving grayscale value of each color sub-pixel in each pixel on the optoelectronic display screen and the corresponding tristimulus value; a target brightness and chromaticity determination module, configured to determine target brightness and chromaticity based on brightness and chromaticity distribution characteristics of each color sub-pixel in the calibration image under preset test conditions, wherein the preset test conditions include setting the driving grayscale value to the target grayscale value and setting the calibration image color type to the target color type; a target driving grayscale combination module, configured to calculate a driving grayscale combination of each color sub-pixel of each pixel on the electro-optical display screen under the test conditions according to the mapping relationship, the target brightness and chromaticity, and the brightness and chromaticity deviation allowable range corresponding to the test conditions, and determine a target driving grayscale combination; The drive control parameter adjustment module is used to adjust the drive control parameters of the optoelectronic display screen according to the target drive grayscale combination, and output the adjusted drive control parameters to the optoelectronic display screen to achieve correction of optical display parameters.

10. An optical display parameter correction device for a photoelectric display screen, characterized in that: include: At least one processor, at least one memory, and computer program instructions stored in the memory, which implement the method according to any one of claims 1 to 8 when the computer program instructions are executed by the processor.

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