A color temperature compensation method and display device for display panels

Abstract

This application provides a color temperature compensation method and display device for display panels. The method determines full grayscale color temperature data using first chromaticity coordinate information and compensated color temperature data using second chromaticity coordinate information. It then matches the uncorrected full grayscale color temperature data with the compensated color temperature data, determining the difference between each grayscale color temperature data under uncorrected conditions and the standard grayscale color temperature data. This allows adjustment of the grayscale of each solid color image, thereby changing the compensated color temperature data to be close to or even equal to the standard grayscale color temperature data. The method determines the compensated color temperature data corresponding to each grayscale color temperature data under uncorrected conditions, thus determining the corrected chromaticity data for each grayscale. Finally, color compensation is performed on the display panel based on the corrected chromaticity data. This process eliminates the need to capture chromaticity images or extract data, improving data processing efficiency.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a color temperature compensation method and display device for use in display panels. Background Technology

[0002] TFT-LCD (thin film transistor-liquid crystal display) is widely used due to its advantages such as long lifespan, mature technology, and low price. However, in the use of existing liquid crystal display devices, color bleeding between color blocks in the color filter can cause certain color errors, resulting in deviations in color temperature and color accuracy when the liquid crystal display device is displayed. To correct these color deviations, the displayed image is calibrated.

[0003] Specifically, in the color temperature calibration process of existing liquid crystal display devices, the brightness and chromaticity information of the liquid crystal display panel are obtained. The gamma voltage of the liquid crystal display panel is adjusted using the DGC (Digital Gamma Compensation) algorithm to generate a full grayscale gamma voltage adjustment table. Then, the chromaticity is adjusted using the WT (White Tracking) algorithm to achieve gamma voltage and chromaticity calibration. However, in actual use, it has been found that because the WT algorithm adjusts the color temperature of one panel with the middle degree of color deviation among multiple panels, it does not consider the inter-panel color temperature differences, resulting in poor color temperature compensation.

[0004] To address the issue of poor color temperature compensation, existing technologies automatically adjust the image quality of each panel during the factory's automated debugging phase, supplementing and adjusting the gamma voltage and color coordinates. However, in practice, it has been found that this process requires additional chromaticity images, and the exposure time needs to be switched during image acquisition. After obtaining the chromaticity information, additional processing of the chromaticity compensation table is also required, resulting in a lengthy process. Furthermore, this process needs to be repeated for each panel, further increasing the time required and leading to low efficiency.

[0005] Therefore, the existing automatic adjustment stage, which compensates for color temperature by taking additional color images, has the technical problem of being time-consuming and inefficient. Summary of the Invention

[0006] This application provides a color temperature compensation method and display device for display panels, which improves the technical problem that the existing automatic adjustment stage of color temperature compensation by taking additional color images is time-consuming and inefficient.

[0007] This application provides a color temperature compensation method for a display panel, the color temperature compensation method including:

[0008] Obtain the first chromaticity coordinate information corresponding to the initial grayscale image of the display panel and the second chromaticity coordinate information corresponding to the solid color image of the display panel;

[0009] The full grayscale color temperature data of the display panel is determined based on the first chromaticity coordinate information;

[0010] The compensated color temperature data of the display panel is determined based on the second chromaticity coordinate information;

[0011] The full grayscale color temperature data of the display panel and the compensated color temperature data are matched to determine the corrected colorimetric data of the display panel;

[0012] The display panel is chromaticity compensated based on the corrected chromaticity data.

[0013] In some embodiments, the step of obtaining the first chromaticity coordinate information corresponding to the initial grayscale image of the display panel and the second chromaticity coordinate information corresponding to the solid color image of the display panel includes:

[0014] The first chromaticity coordinate information corresponding to the initial grayscale image of the display panel and the second chromaticity coordinate information corresponding to the solid color image of the display panel are obtained using a brightness sensor and a chromaticity sensor.

[0015] In some embodiments, the first chromaticity coordinate information corresponding to the initial grayscale image of the display panel is the first chromaticity coordinate information corresponding to a portion of the initial grayscale image of the display panel, and the step of determining the full grayscale color temperature data of the display panel based on the first chromaticity coordinate information includes:

[0016] Based on the first chromaticity coordinate information corresponding to a portion of the initial grayscale images of the display panel, a spline interpolation algorithm is used to determine the first chromaticity coordinate information corresponding to all the initial grayscale images of the display panel.

[0017] The full grayscale color temperature data of the display panel is determined using a first formula, wherein the first formula is:

[0018] CCT-ORI = -437*tmp1 3 +3601*tmp1 2 -6861*tmp1+5514.31;

[0019] Where CCT-ORI is the full grayscale color temperature data of the display panel, tmp1=(x1-0.332) /

[0020] (y1-0.1858), x1=X1 / (X1+Y1+Z1), y1=Y1 / (X1+Y1+Z1), where X1, Y1, and Z1 are the color coordinates in the first chromaticity coordinate information corresponding to the initial grayscale image.

[0021] In some embodiments, the step of determining the compensated color temperature data of the display panel based on the second chromaticity coordinate information includes:

[0022] The chromaticity matrix of the display panel is determined based on the second chromaticity coordinate information, and the third chromaticity coordinate information corresponding to the compensated grayscale image of the display panel is obtained based on the chromaticity matrix.

[0023] The compensation color temperature data of the display panel is determined based on the third chromaticity coordinate information.

[0024] In some embodiments, the second chromaticity coordinate information corresponding to the solid color image of the display panel is the second chromaticity coordinate information corresponding to a portion of the solid color image of the display panel. The step of determining the chromaticity matrix of the display panel based on the second chromaticity coordinate information and obtaining the third chromaticity coordinate information corresponding to the compensated grayscale image of the display panel based on the chromaticity matrix includes:

[0025] Linear interpolation is performed on the second chromaticity coordinate information corresponding to a portion of the solid color image on the display panel to obtain the chromaticity matrix of the display panel;

[0026] The third chromaticity coordinate information corresponding to each compensated grayscale image of the display panel is determined based on the chromaticity matrix.

[0027] In some embodiments, the step of determining the third chromaticity coordinate information corresponding to each compensated grayscale image of the display panel based on the chromaticity matrix includes:

[0028] Based on the chromaticity matrix, determine the fourth chromaticity coordinate information of the corresponding compensated grayscale image when any two sub-pixels among the red, blue, and green sub-pixels have the same grayscale.

[0029] Based on the chromaticity matrix, determine the fifth chromaticity coordinate information of the corresponding compensated grayscale image when at least two sub-pixels among the red, blue, and green sub-pixels have different grayscale levels.

[0030] Based on the fourth chromaticity coordinate information and the fifth chromaticity coordinate information, the third chromaticity coordinate information corresponding to each compensated grayscale image of the display panel is determined.

[0031] In some embodiments, the step of determining the compensated color temperature data of the display panel based on the third chromaticity coordinate information includes:

[0032] The full grayscale color temperature data of the display panel is determined using a second formula; the second formula is:

[0033] CCT-FIT = -437 * tmp2 3 +3601*tmp2 2 -6861*tmp2+5514.31;

[0034] Wherein, CCT-FIT is the compensated color temperature data of the display panel, tmp2=(x2-0.332) / (y2-0.1858), x2=X2 / (X2+Y2+Z2), y2=Y2 / (X2+Y2+Z2), and X2, Y2, and Z2 are the color coordinates in the third chromaticity coordinate information corresponding to the compensated grayscale image.

[0035] In some embodiments, the step of matching the full grayscale color temperature data of the display panel with the compensated color temperature data to determine the corrected chromaticity data of the display panel includes:

[0036] Based on the full grayscale color temperature data of the display panel, determine the standard color temperature data of the display panel;

[0037] The standard color temperature data and the compensated color temperature data of the display panel are matched to determine the corrected colorimetric data of the display panel.

[0038] In some embodiments, after determining the standard color temperature data of the display panel based on the full grayscale color temperature data of the display panel, the method further includes:

[0039] The grayscale color temperature data of the display panel is compared with the standard color temperature data to determine the difference between the grayscale color temperature data of the display panel and the standard color temperature data.

[0040] Based on the difference between each grayscale color temperature data and the standard color temperature data, the second chromaticity coordinate information is adjusted to obtain the adjusted second chromaticity coordinate information;

[0041] The adjusted compensation color temperature data is obtained based on the adjusted second chromaticity coordinate information.

[0042] Meanwhile, embodiments of this application provide a display device, the display device including a driving system and a display panel linked to the driving system, the driving system including:

[0043] The measurement module is used to acquire the first chromaticity coordinate information corresponding to the initial grayscale image of the display panel and the second chromaticity coordinate information corresponding to the solid color image of the display panel.

[0044] The calculation module is used to determine the full grayscale color temperature data of the display panel based on the first chromaticity coordinate information and to determine the compensated color temperature data of the display panel based on the second chromaticity coordinate information.

[0045] The compensation module, wherein the compensation film is used to match the full grayscale color temperature data of the display panel with the compensated color temperature data to determine the corrected chromaticity data of the display panel and to perform chromaticity compensation on the display panel based on the corrected chromaticity data.

[0046] Beneficial Effects: This application provides a color temperature compensation method and display device for display panels. The color temperature compensation method obtains first chromaticity coordinate information corresponding to the initial grayscale image of the display panel and second chromaticity coordinate information corresponding to the solid color image of the display panel. It determines the full grayscale color temperature data of the display panel before calibration using the first chromaticity coordinate information, and determines the compensated color temperature data for the corresponding grayscale under different grayscale solid color image combinations using the second chromaticity coordinate information. This allows for matching the uncalibrated full grayscale color temperature data and the compensated color temperature data, determining the difference between each grayscale color temperature data and the standard grayscale color temperature data. This allows adjustment of the grayscale of each solid color image to change the compensated color temperature data, making it close to or even equal to the standard grayscale color temperature data. The method then determines the compensated color temperature data corresponding to each grayscale color temperature data before calibration, thereby determining the calibrated chromaticity data for each grayscale. Finally, color compensation is performed on the display panel based on the calibrated chromaticity data. This process compensates for the color temperature of each display panel by using the luminance and chrominance coordinates of each display panel. It eliminates the need to take chrominance pictures or extract images; the compensation data can be determined directly by calculating the above data, thereby reducing the time required for color temperature compensation and improving the efficiency of data processing. Attached Figure Description

[0047] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0048] Figure 1 A flowchart of the color temperature compensation method provided in the embodiments of this application.

[0049] Figure 2 This is a schematic diagram of the structure of the display device provided in the embodiments of this application. Detailed Implementation

[0050] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0051] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0054] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0055] This application addresses the technical problem that the existing automatic adjustment stage, which involves taking additional chromaticity images for color temperature compensation, is time-consuming and inefficient. It provides a color temperature compensation method and display device for display panels to improve upon the aforementioned technical problem.

[0056] like Figure 1 As shown in the embodiment of this application, a color temperature compensation method is provided, which includes:

[0057] S1, obtain the first chromaticity coordinate information corresponding to the initial grayscale image of the display panel and the second chromaticity coordinate information corresponding to the solid color image of the display panel;

[0058] Specifically, color temperature is determined by chromaticity and luminance. Therefore, adjusting either chromaticity or luminance will adjust the color temperature.

[0059] Specifically, this color temperature compensation method can be applied to display panels.

[0060] Specifically, the display panel can be an LCD display panel.

[0061] Specifically, the initial grayscale image of the display panel is the image of the display panel at different grayscale levels before calibration. For example, if the display panel includes 256 grayscale levels, specifically from grayscale level 0 to grayscale level 255, then the initial grayscale image of the display panel can be the image corresponding to these 256 grayscale levels, or it can be the image corresponding to some of the grayscale levels among the 256 grayscale levels.

[0062] Specifically, the display panel includes pixels, and each pixel includes red sub-pixels, blue sub-pixels, and green sub-pixels. Taking the 16th gray level out of 256 gray levels as an example, the image corresponding to the 16th gray level is the image when the red sub-pixel displays the 16th gray level, the blue sub-pixel displays the 16th gray level, and the green sub-pixel displays the 16th gray level.

[0063] Specifically, the first chromaticity coordinate information corresponding to the initial grayscale image refers to the grayscale of each grayscale image, the chromaticity coordinates corresponding to each grayscale image, and the correspondence between grayscale and chromaticity coordinates. It can be understood that chromaticity coordinates are coordinates that represent color and can be represented by X, Y, and Z. Therefore, each grayscale image has its own color, and this color can be determined by chromaticity coordinates.

[0064] Specifically, the first chromaticity coordinate information refers to each gray level and its corresponding chromaticity coordinates. For example, the chromaticity coordinates corresponding to the 16th gray level are X16, Y16, and Z16. Therefore, the first chromaticity coordinate information includes the 16th gray level and its corresponding chromaticity coordinates X16, Y16, and Z16, as well as their corresponding relationships.

[0065] Specifically, a solid color display on a display panel refers to a monochrome display. For example, if a display panel consists of pixels, and each pixel includes red, blue, and green sub-pixels, then a solid color display includes a red display when only red sub-pixels are displayed, a blue display when only blue sub-pixels are displayed, and a green display when only green sub-pixels are displayed. It is also understood that each sub-pixel has multiple gray levels when displayed. For example, if the display panel has gray levels from 0 to 255, then a solid color display includes solid color displays of all gray levels or solid color displays of some gray levels. For example, a solid color display includes a red display of gray level 10 and a red display of gray level 11.

[0066] Specifically, the second chromaticity coordinate information corresponding to a solid color image refers to the grayscale of each solid color image, the chromaticity coordinates of each solid color image, and the correspondence between the grayscale and chromaticity coordinates of each solid color image. It can be understood that chromaticity coordinates are coordinates that represent color and can be represented by X, Y, and Z. Therefore, each solid color image has its own color, and this color can be determined by chromaticity coordinates.

[0067] In some embodiments, the step of obtaining the first chromaticity coordinate information corresponding to the initial grayscale image of the display panel and the second chromaticity coordinate information corresponding to the solid color image of the display panel includes:

[0068] The display panel uses a luminance sensor and a chrominance sensor to acquire the first chrominance coordinates corresponding to the initial grayscale image and the second chrominance coordinates corresponding to the solid color image. Acquiring the luminance and chrominance coordinates of the display panel using these sensors improves data accuracy and efficiency compared to using a camera.

[0069] Specifically, when acquiring the first chromaticity coordinate information corresponding to the initial grayscale image of the display panel and the second chromaticity coordinate information corresponding to the solid color image of the display panel, it is possible to acquire only the chromaticity coordinate information of a portion of the initial grayscale image and a portion of the solid color image, thereby improving data acquisition efficiency.

[0070] For example, the first chromaticity coordinate information of m initial grayscale images can be obtained, and the second chromaticity coordinate information corresponding to n solid color images can be obtained. Further, m and n can both be 11, thus obtaining the first chromaticity coordinate information of the initial grayscale images corresponding to grayscale levels 0, 16, 25, 32, 48, 60, 96, 128, 224, and 255, as well as the second chromaticity coordinate information of the corresponding red, blue, and green images. However, the embodiments of this application are not limited to this; m and n can be unequal, and m and n can be 256.

[0071] Specifically, before proceeding to the next step, the aforementioned data can be input into the next execution module so that the next module can perform other steps. For example, the data obtained in step S1 can be input into the calculation module, so that the calculation module can perform calculations based on the aforementioned data and perform color compensation on the display panel.

[0072] S2, determine the full grayscale color temperature data of the display panel based on the first chromaticity coordinate information;

[0073] Specifically, the full grayscale color temperature data of the display panel refers to the color temperature data corresponding to each grayscale level of the display panel when it is not calibrated. This color temperature data can be determined based on the first chromaticity coordinate information of each initial grayscale level.

[0074] Specifically, taking a display panel with 256 gray levels as an example, the full gray level color temperature data of the display panel refers to the color temperature data corresponding to these 256 gray levels.

[0075] In some embodiments, the first chromaticity coordinate information corresponding to the initial grayscale image of the display panel is the first chromaticity coordinate information corresponding to a portion of the initial grayscale image of the display panel, and the step of determining the full grayscale color temperature data of the display panel based on the first chromaticity coordinate information includes:

[0076] Based on the first chromaticity coordinate information corresponding to a portion of the initial grayscale images of the display panel, a spline interpolation algorithm is used to determine the first chromaticity coordinate information corresponding to all the initial grayscale images of the display panel.

[0077] The full grayscale color temperature data of the display panel is determined using a first formula, wherein the first formula is:

[0078] CCT-ORI = -437*tmp1 3 +3601*tmp1 2 -6861*tmp1+5514.31;

[0079] Wherein, CCT-ORI is the full grayscale color temperature data of the display panel, tmp1=(x1-0.332) / (y1-0.1858), x1=X1 / (X1+Y1+Z1), y1=Y1 / (X1+Y1+Z1), and X1, Y1, and Z1 are the color coordinates in the first chromaticity coordinate information corresponding to the initial grayscale image.

[0080] Specifically, to improve data processing efficiency, when obtaining the first chromaticity coordinate information, only a portion of the initial grayscale images can be acquired. Then, based on this partial initial grayscale image information, the first chromaticity coordinate information for all initial grayscale images can be determined, thus improving processing efficiency. Furthermore, it's understandable that since the chromaticity coordinate information corresponding to the initial grayscale images is not accurate, using spline interpolation to obtain the chromaticity coordinate information for all initial grayscale images has little or no impact on the final correction structure.

[0081] Specifically, the desired effect of this application embodiment is that the color temperature of all gray levels is similar or even equal. The maximum gray level (e.g., gray level 255) cannot have its color temperature changed by increasing the gray level. Therefore, the color temperature data corresponding to the maximum gray level can be used as the standard color temperature data. The color temperature data of other gray levels are compared with the color temperature data of the maximum gray level. When the color temperature data of other gray levels differs from that of the maximum gray level, the chromaticity coordinate information of the other gray levels is adjusted to adjust their color temperature data, making the color temperatures of all gray levels similar or even equal. Therefore, when obtaining the first chromaticity coordinate information of a portion of the gray level image, the first chromaticity coordinate information of the maximum gray level and the first chromaticity coordinate information of other gray levels can be obtained. Then, after determining the first chromaticity coordinate information of all gray levels, the first chromaticity coordinate information of the other gray levels is corrected. Therefore, the use of spline interpolation algorithm to obtain the chromaticity coordinate information corresponding to all gray levels in this process has little or no impact on the final correction structure.

[0082] Specifically, in order to make the first chromaticity coordinate information corresponding to all initial grayscale images determined by the spline interpolation algorithm more accurate, when obtaining the first chromaticity coordinate information corresponding to some initial grayscale images, the first chromaticity coordinate information corresponding to key grayscale images can be obtained, such as grayscale 0, grayscale 16, grayscale 128, and grayscale 255.

[0083] Specifically, the first chromaticity coordinate information corresponding to all grayscale images can be determined using a spline interpolation algorithm. For example, after obtaining the first chromaticity coordinate information of the initial grayscale images corresponding to grayscale levels 0, 16, 25, 32, 48, 60, 96, 128, 224, and 255, the first chromaticity coordinate information corresponding to grayscale levels 0 to 255 can be determined using a spline interpolation algorithm.

[0084] Specifically, in the first formula, for example, X1, Y1, and Z1 are the color coordinates in the first chromaticity coordinate information corresponding to the 16th gray level. Then, x1 and y1 can be determined by the color coordinates corresponding to the 16th gray level, and tmp1 can be determined by x1 and y1. Then, the color temperature data CCT-ORI of the 16th gray level can be determined by tmp1. Similarly, the color temperature data of other gray levels can be determined by the first chromaticity coordinate information of other gray levels.

[0085] Specifically, by determining the color temperature data of the entire grayscale, when the color temperature data corresponding to each grayscale is different, the color temperature data corresponding to each grayscale can be adjusted by adjusting the chromaticity coordinate information of each grayscale, so that the color temperature data corresponding to all grayscales are similar or even equal.

[0086] S3, determine the compensation color temperature data of the display panel based on the second chromaticity coordinate information;

[0087] Specifically, the compensated color temperature data refers to the color temperature data under the grayscale combination of sub-pixels of different colors, determined based on the second chromaticity coordinate information. For example, if the grayscale of the red sub-pixel is grayscale 16, the grayscale of the green sub-pixel is grayscale 16, and the grayscale of the blue sub-pixel is grayscale 17, then the compensated color temperature data under this grayscale combination can be determined. This data is not calculated in the full grayscale color temperature data. This application uses the compensated color temperature data under these grayscale combinations to compensate the color temperature data corresponding to each grayscale image, so that the color temperature of all grayscale images is similar or even the same.

[0088] In some embodiments, the step of determining the compensated color temperature data of the display panel based on the second chromaticity coordinate information includes:

[0089] The chromaticity matrix of the display panel is determined based on the second chromaticity coordinate information, and the third chromaticity coordinate information corresponding to the compensated grayscale image of the display panel is obtained based on the chromaticity matrix.

[0090] The compensated color temperature data of the display panel is determined based on the third chromaticity coordinate information. By determining the chromaticity matrix of the display panel, the third chromaticity coordinate information corresponding to each compensated grayscale image can be determined through the chromaticity matrix, and then the compensated color temperature data of the display panel is determined based on the third chromaticity coordinate information.

[0091] Specifically, for example, if the second chromaticity coordinate information includes the chromaticity coordinates of the red sub-pixel at gray levels 16 and 17, the green sub-pixel at gray levels 16 and 17, and the blue sub-pixel at gray levels 16 and 17, then when determining the chromaticity matrix, we can determine the chromaticity matrix corresponding to the compensated gray level image where the red sub-pixel uses gray level 16, the green sub-pixel uses gray level 16, and the blue sub-pixel uses gray level 16. For example:

[0092]

[0093] Where M(16, 16, 16) represents the chromaticity matrix corresponding to the compensated grayscale image where the red sub-pixel uses the 16th grayscale, the green sub-pixel uses the 16th grayscale, and the blue sub-pixel uses the 16th grayscale, and X... R16 Y R16 and Z R16 This represents the color coordinates (X) in the second chromaticity coordinate information corresponding to the red image when the red sub-pixel uses the 16th gray level. G16 Y G16 and Z G16 This represents the color coordinates in the second chromaticity coordinate information corresponding to the green image when the green sub-pixel uses the 16th gray level, X. B16 Y B16 and Z B16 This represents the chromaticity coordinates in the second chromaticity coordinate information corresponding to the blue image when the blue sub-pixel uses the 16th gray level. Correspondingly, the third chromaticity coordinate information corresponding to this chromaticity matrix can be determined. M(16, 16, 16) corresponds to X(16, 16, 16) = X in the third chromaticity information of the compensated gray level image. R16 +X G16 +X B16 Y(16, 16, 16)

[0094] =Y R16 +Y G16 +Y B16 Z(16, 16, 16) = Z R16 +Z G16 +Z B16 This allows us to determine the third chromaticity coordinates of the compensated grayscale images where the red sub-pixel uses the 16th grayscale, the green sub-pixel uses the 16th grayscale, and the blue sub-pixel uses the 16th grayscale. Similarly, for M(16, 16, 17), the difference between it and M(16, 16, 16) is that the blue sub-pixel uses the 17th grayscale. Accordingly, the third chromaticity coordinates of its corresponding compensated grayscale image can be determined. This allows us to determine the third chromaticity coordinates of all compensated grayscale images and, consequently, the compensated color temperature data.

[0095] In some embodiments, the second chromaticity coordinate information corresponding to the solid color image of the display panel is the second chromaticity coordinate information corresponding to a portion of the solid color image of the display panel. The step of determining the chromaticity matrix of the display panel based on the second chromaticity coordinate information and obtaining the third chromaticity coordinate information corresponding to the compensated grayscale image of the display panel based on the chromaticity matrix includes:

[0096] Linear interpolation is performed on the second chromaticity coordinate information corresponding to a portion of the solid color image on the display panel to obtain the chromaticity matrix of the display panel;

[0097] The third chromaticity coordinate information corresponding to each compensated grayscale image of the display panel is determined based on the chromaticity matrix.

[0098] Specifically, to improve data processing efficiency, when obtaining the second chromaticity coordinate information, only the second chromaticity coordinate information of a portion of the solid color images can be obtained. Then, based on the second chromaticity coordinate information of the portion of solid color images, the second chromaticity coordinate information corresponding to all solid color images can be determined, thus improving data processing efficiency. Furthermore, it is understandable that since solid color images only contain grayscale variations of the same color, linear interpolation is a more accurate method for determining their chromaticity.

[0099] Specifically, for example, we can obtain the second chromaticity coordinate information of the red, blue, and green images corresponding to gray levels 0, 16, 25, 32, 48, 60, 96, 128, 224, and 255. Then, through linear interpolation, we can obtain the second chromaticity coordinate information of the red, blue, and green images corresponding to all gray levels of the display panel. This gives us the chromaticity matrix of the display panel, and then we can obtain the third chromaticity coordinate information of each compensated gray level image through the chromaticity matrix of the display panel.

[0100] In some embodiments, the step of determining the third chromaticity coordinate information corresponding to each compensated grayscale image of the display panel based on the chromaticity matrix includes:

[0101] Based on the chromaticity matrix, determine the fourth chromaticity coordinate information of the corresponding compensated grayscale image when any two sub-pixels among the red, blue, and green sub-pixels have the same grayscale.

[0102] Based on the chromaticity matrix, determine the fifth chromaticity coordinate information of the corresponding compensated grayscale image when at least two sub-pixels among the red, blue, and green sub-pixels have different grayscale levels.

[0103] Based on the fourth and fifth chromaticity coordinate information, the third chromaticity coordinate information corresponding to each compensated grayscale image of the display panel is determined. When determining the third chromaticity coordinate information corresponding to the compensated grayscale image based on the chromaticity matrix, the fourth chromaticity coordinate information corresponding to the compensated grayscale image of sub-pixels of the same grayscale and the fourth chromaticity coordinate information corresponding to the compensated grayscale image of sub-pixels of different grayscales can be determined separately. This allows for better matching of full grayscale color temperature data and compensated color temperature data. First, the compensated color temperature data corresponding to the compensated grayscale image of sub-pixels of the same grayscale can be compared with the full grayscale color temperature data. Then, the compensated color temperature data corresponding to the compensated grayscale image of sub-pixels of different grayscales can be compared with the full grayscale color temperature data, facilitating the retrieval of the required compensated color temperature data and improving data processing efficiency.

[0104] Specifically, it can be understood that the full grayscale color temperature data includes the color temperature data corresponding to all initial grayscale images. Taking grayscale levels 0 to 255 as an example, the full grayscale color temperature data consists of the color temperature data corresponding to grayscale levels 0 to 255. This color temperature data represents the color temperature data when displaying grayscale levels without calibration, and may contain some deviations. For example, the color temperature data for grayscale level 16 may differ from that for grayscale level 255. Therefore, when calibrating the color temperature data for grayscale level 16, we can first find the compensation color temperature data corresponding to a compensated grayscale image where the red, blue, and green sub-pixels are all at grayscale level 16. If this compensation color temperature data differs from the color temperature data for grayscale level 255, we can search among the compensation color temperature data corresponding to a compensated grayscale image where at least one of the red, blue, or green sub-pixels is not at grayscale level 16. This allows us to find compensation color temperature data that is similar to or even identical to the color temperature data for grayscale level 255, improving data search efficiency.

[0105] In some embodiments, the step of determining the compensated color temperature data of the display panel based on the third chromaticity coordinate information includes:

[0106] The full grayscale color temperature data of the display panel is determined using a second formula; the second formula is:

[0107] CCT-FIT = -437 * tmp2 3 +3601*tmp2 2 -6861*tmp2+5514.31;

[0108] Wherein, CCT-FIT is the compensated color temperature data of the display panel, tmp2=(x2-0.332) / (y2-0.1858), x2=X2 / (X2+Y2+Z2), y2=Y2 / (X2+Y2+Z2), and X2, Y2, and Z2 are the color coordinates in the third chromaticity coordinate information corresponding to the compensated grayscale image.

[0109] Specifically, in the second formula, for example, X2, Y2, and Z2 are the color coordinates in the third chromaticity coordinate information of the compensated grayscale image corresponding to the 16th grayscale level for red sub-pixels, the 16th grayscale level for green sub-pixels, and the 17th grayscale level for blue sub-pixels. Then, x2 and y2 can be determined by the color coordinates of the compensated grayscale image, and then tmp2 can be determined by x2 and y2. Then, the color temperature data CCT-FIT corresponding to the compensated grayscale image can be determined by tmp2. Similarly, the color temperature data of other compensated grayscale images can be determined based on the third chromaticity coordinate information of other compensated grayscale images.

[0110] Specifically, as can be seen from the above embodiments, when the red sub-pixel is at gray level 16, the green sub-pixel is at gray level 16, and the blue sub-pixel is at gray level 17, X2 = X R16 +X G16 +X B17 Y2 = Y R16 +Y G16 +Y B17 Z2 = Z R16 +Z G16 +Z B17 This allows us to determine the corresponding color temperature data, CCT-FIT.

[0111] S4, Match the full grayscale color temperature data and the compensated color temperature data of the display panel to determine the corrected colorimetric data of the display panel;

[0112] Specifically, when matching the full grayscale color temperature data and compensated color temperature data of the display panel to determine the corrected colorimetric data of the display panel, the color temperature data corresponding to a certain grayscale of the display panel can be compared with the standard color temperature data first. Based on the color temperature data corresponding to that grayscale, the corresponding compensated color temperature data in the compensated color temperature data can be determined. Then, based on the compensated color temperature data corresponding to that grayscale, the actual compensated color temperature data corresponding to the standard color temperature data can be found, thereby determining the corrected colorimetric data.

[0113] For example, in the above embodiments, the color temperature data at grayscale 16 and grayscale 256 have been determined. In some cases, the color temperature data at grayscale 16 differs from that at grayscale 256. In such cases, the compensated color temperature data corresponding to the compensated grayscale image at grayscale 16 for red, green, and blue sub-pixels can be found in the compensated color temperature data. This compensated color temperature data is then compared with the standard color temperature data to determine the difference. Finally, other compensated color temperature data can be used to find values ​​similar to or even exceeding the standard color temperature data. With the same compensation color temperature data, the compensation color temperature data that matches the 16th gray level can be determined. At this time, the compensation gray level image corresponding to the compensation color temperature data may be the compensation gray level image when the red sub-pixel and green sub-pixel are still at the 16th gray level, and the blue sub-pixel is at the 17th gray level. By matching the color temperature data of each gray level with the compensation color temperature data, the mapping relationship between each gray level and the correction color temperature data can be obtained, so that the color temperature of each gray level can be corrected. For example, when displaying the 16th gray level, the blue sub-pixel can be made to display the 17th gray level, thereby correcting the color temperature of the 16th gray level.

[0114] In some embodiments, the step of matching the full grayscale color temperature data of the display panel with the compensated color temperature data to determine the corrected chromaticity data of the display panel includes:

[0115] Based on the full grayscale color temperature data of the display panel, determine the standard color temperature data of the display panel;

[0116] The standard color temperature data and the compensated color temperature data of the display panel are matched to determine the corrected chromaticity data of the display panel. By determining the standard color temperature data of the display panel and then matching the standard color temperature data and the compensated color temperature data so that the standard color temperature data and the compensated color temperature data are similar or even the same, the corrected chromaticity data of the display panel can be determined.

[0117] Specifically, taking grayscale levels 0 to 255 as an example, after determining the color temperature data of all grayscale levels, the color temperature data corresponding to grayscale level 255 can be used as the standard color temperature data. At the same time, the compensation color temperature data corresponding to all compensation grayscale images can be determined. Then, when correcting the color temperature data of each grayscale, the compensation color temperature data corresponding to each grayscale can be compared with the standard color temperature data to determine the corrected color temperature data of each grayscale, thereby determining the corrected chromaticity data of each grayscale.

[0118] In some embodiments, after determining the standard color temperature data of the display panel based on the full grayscale color temperature data of the display panel, the method further includes:

[0119] The grayscale color temperature data of the display panel is compared with the standard color temperature data to determine the difference between the grayscale color temperature data of the display panel and the standard color temperature data.

[0120] Based on the difference between each grayscale color temperature data and the standard color temperature data, the second chromaticity coordinate information is adjusted to obtain the adjusted second chromaticity coordinate information;

[0121] The adjusted compensation color temperature data is obtained based on the adjusted second chromaticity coordinate information. When matching the full grayscale color temperature data and the compensation color temperature data, the difference between each grayscale color temperature data and the standard color temperature data can be determined first. This allows us to determine the color temperature bias of each grayscale. For example, if the color temperature of a grayscale is bluish, the grayscale of the corresponding blue sub-pixel can be decreased or increased, thus changing the second chromaticity coordinate information. The adjusted compensation color temperature data is then obtained through the adjusted second chromaticity coordinate information. If the difference between the adjusted compensation color temperature data and the standard color temperature data still does not meet the requirements, for example, if the difference is too large and causes a significant color temperature difference, the second chromaticity coordinate information can be further adjusted to obtain the adjusted compensation color temperature data.

[0122] For example, if there is a difference between the color temperature data of grayscale 16 and grayscale 255, indicating that the color temperature of grayscale 16 is bluish, the second chromaticity coordinate information can be adjusted so that the red, green, and blue sub-pixels corresponding to the compensated grayscale image are all grayscale 16. The red sub-pixel becomes grayscale 17, the green sub-pixel becomes grayscale 17, and the blue sub-pixel remains grayscale 16. This will give you the adjusted compensated color temperature data. If there is still a difference, the grayscale of each sub-pixel can be further adjusted to change its chromaticity, thereby changing the color temperature.

[0123] S5 performs color compensation on the display panel based on the corrected colorimetric data.

[0124] Specifically, after obtaining the corrected chromaticity data, the display panel can be chromaticity compensated using the corrected chromaticity data. For example, the corrected chromaticity data corresponding to the 16th gray level is the chromaticity data of the red sub-pixel in the 17th gray level, the chromaticity data of the green sub-pixel in the 17th gray level, and the chromaticity data of the blue sub-pixel in the 16th gray level. Then, the actual gray level of each sub-pixel at the 16th gray level can be adjusted to correct the chromaticity of the 16th gray level image and compensate for the color temperature of the 16th gray level image.

[0125] This application provides a color temperature compensation method. This method obtains first chromaticity coordinate information corresponding to the initial grayscale image of the display panel and second chromaticity coordinate information corresponding to the solid color image of the display panel. The first chromaticity coordinate information is used to determine the full grayscale color temperature data of the display panel before calibration. The second chromaticity coordinate information is used to determine the compensated color temperature data for the corresponding grayscale images of the display panel under different grayscale solid color image combinations. The uncalibrated full grayscale color temperature data and the compensated color temperature data are then matched to determine the difference between each grayscale color temperature data and the standard grayscale color temperature data. The grayscale of each solid color image can then be adjusted to change the compensated color temperature data, making the compensated color temperature data similar to or even equal to the standard grayscale color temperature data. The compensated color temperature data corresponding to each grayscale color temperature data before calibration is determined, thereby determining the calibrated chromaticity data for each grayscale. Finally, color compensation is performed on the display panel based on the calibrated chromaticity data. This process compensates for the color temperature of each display panel by using the luminance and chrominance coordinates of each display panel. It eliminates the need to take chrominance pictures or extract images; the compensation data can be determined directly by calculating the above data, thereby reducing the time required for color temperature compensation and improving the efficiency of data processing.

[0126] The above embodiments are illustrated by compensating the color temperature of the display panel through chromaticity compensation. It can be understood that the embodiments of this application may also execute the DGC algorithm before performing the above chromaticity compensation, and execute Demura and WT after performing the above chromaticity compensation.

[0127] At the same time, such as Figure 2 As shown, this application embodiment provides a display device, which includes a driving system 11 and a display panel 12 connected to the driving system 11. The driving system 11 includes:

[0128] The measurement module 101 is used to acquire the first chromaticity coordinate information corresponding to the initial grayscale image of the display panel and the second chromaticity coordinate information corresponding to the solid color image of the display panel.

[0129] The calculation module 102 is used to determine the full grayscale color temperature data of the display panel based on the first chromaticity coordinate information and to determine the compensated color temperature data of the display panel based on the second chromaticity coordinate information.

[0130] The compensation module 103 is used to match the full grayscale color temperature data of the display panel and the compensated color temperature data to determine the corrected chromaticity data of the display panel and to perform chromaticity compensation on the display panel based on the corrected chromaticity data.

[0131] Specifically, the measurement module, calculation module, and compensation module can all be set up in the timing control board. The calculation module and compensation module can include the circuit logic in the timing control board, and the above functions can be realized through the calculation module and compensation module.

[0132] In some embodiments, the measurement module is used to acquire first chromaticity coordinate information corresponding to the initial grayscale image of the display panel and second chromaticity coordinate information corresponding to the solid color image of the display panel using a brightness sensor and a chromaticity sensor.

[0133] In some embodiments, the calculation module is used to determine the first chromaticity coordinate information corresponding to all initial grayscale images of the display panel based on the first chromaticity coordinate information corresponding to a portion of the initial grayscale images of the display panel using a spline interpolation algorithm.

[0134] The full grayscale color temperature data of the display panel is determined using a first formula; the first formula is:

[0135] CCT-ORI = -437*tmp1 3 +3601*tmp1 2 -6861*tmp1+5514.31;

[0136] Wherein, CCT-ORI is the full grayscale color temperature data of the display panel, tmp1=(x1-0.332) / (y1-0.1858), x1=X1 / (X1+Y1+Z1), y1=Y1 / (X1+Y1+Z1), and X1, Y1, and Z1 are the color coordinates in the first chromaticity coordinate information corresponding to the initial grayscale image.

[0137] In some embodiments, the calculation module is used to determine the chromaticity matrix of the display panel based on the second chromaticity coordinate information, and obtain the third chromaticity coordinate information corresponding to the compensated grayscale image of the display panel based on the chromaticity matrix; and determine the compensated color temperature data of the display panel based on the third chromaticity coordinate information.

[0138] In some embodiments, the calculation module is used to perform linear interpolation on the second chromaticity coordinate information corresponding to a portion of the solid color image of the display panel to obtain the chromaticity matrix of the display panel; and to determine the third chromaticity coordinate information corresponding to each compensated grayscale image of the display panel based on the chromaticity matrix.

[0139] In some embodiments, the calculation module is configured to determine, based on the chromaticity matrix, the fourth chromaticity coordinate information corresponding to the compensated grayscale image when any two sub-pixels among the red, blue, and green sub-pixels have the same grayscale; based on the chromaticity matrix, the fifth chromaticity coordinate information corresponding to the compensated grayscale image when at least two sub-pixels among the red, blue, and green sub-pixels have different grayscale; and based on the fourth and fifth chromaticity coordinate information, the third chromaticity coordinate information corresponding to each compensated grayscale image of the display panel.

[0140] In some embodiments, the calculation module is used for the step of determining the compensated color temperature data of the display panel based on the third chromaticity coordinate information, including:

[0141] The full grayscale color temperature data of the display panel is determined using a second formula; the second formula is:

[0142] CCT-FIT = -437 * tmp2 3 +3601*tmp2 2 -6861*tmp2+5514.31;

[0143] Wherein, CCT-FIT is the compensated color temperature data of the display panel, tmp2=(x2-0.332) / (y2-0.1858), x2=X2 / (X2+Y2+Z2), y2=Y2 / (X2+Y2+Z2), and X2, Y2, and Z2 are the color coordinates in the third chromaticity coordinate information corresponding to the compensated grayscale image.

[0144] In some embodiments, the compensation module is used to determine the standard color temperature data of the display panel based on the full grayscale color temperature data of the display panel; and to match the standard color temperature data and the compensated color temperature data of the display panel to determine the corrected colorimetric data of the display panel.

[0145] In some embodiments, the compensation module is used to compare the grayscale color temperature data of the display panel with the standard color temperature data to determine the difference between the grayscale color temperature data of the display panel and the standard color temperature data; adjust the second chromaticity coordinate information according to the difference between the grayscale color temperature data and the standard color temperature data to obtain the adjusted second chromaticity coordinate information; and obtain the adjusted compensated color temperature data according to the adjusted second chromaticity coordinate information.

[0146] As can be seen from the above embodiments:

[0147] This application provides a color temperature compensation method and display device for a display panel. The method obtains first chromaticity coordinate information corresponding to the initial grayscale image of the display panel and second chromaticity coordinate information corresponding to the solid color image of the display panel. The first chromaticity coordinate information is used to determine the full grayscale color temperature data of the display panel before calibration. The second chromaticity coordinate information is used to determine the compensated color temperature data for the corresponding grayscale images of the display panel under different grayscale solid color image combinations. The uncalibrated full grayscale color temperature data and the compensated color temperature data are then matched to determine the difference between each grayscale color temperature data and the standard grayscale color temperature data. The grayscale of each solid color image can then be adjusted to change the compensated color temperature data, making the compensated color temperature data similar to or even equal to the standard grayscale color temperature data. The compensated color temperature data corresponding to each grayscale color temperature data before calibration is determined, thereby determining the calibrated chromaticity data for each grayscale. Finally, color temperature compensation is performed on the display panel based on the calibrated chromaticity data. This process compensates for the color temperature of each display panel by using the luminance and chrominance coordinates of each display panel. It eliminates the need to take chrominance pictures or extract images; the compensation data can be determined directly by calculating the above data, thereby reducing the time required for color temperature compensation and improving the efficiency of data processing.

[0148] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0149] The above provides a detailed description of a color temperature compensation method and display device for a display panel, as provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A color temperature compensation method for a display panel, characterized in that, include: Obtain the first chromaticity coordinate information corresponding to the initial grayscale image of the display panel and the second chromaticity coordinate information corresponding to the solid color image of the display panel; The full grayscale color temperature data of the display panel is determined based on the first chromaticity coordinate information; The compensated color temperature data of the display panel is determined based on the second chromaticity coordinate information; The full grayscale color temperature data of the display panel and the compensated color temperature data are matched to determine the corrected colorimetric data of the display panel; The display panel is chromaticity compensated based on the corrected chromaticity data; Wherein, the first chromaticity coordinate information corresponding to the initial grayscale image of the display panel is the first chromaticity coordinate information corresponding to a portion of the initial grayscale image of the display panel, and the step of determining the full grayscale color temperature data of the display panel based on the first chromaticity coordinate information includes: determining the full grayscale color temperature data of the display panel using a first formula, wherein the first formula is: Wherein, CCT-ORI is the full grayscale color temperature data of the display panel, tmp1=(x1-0.332) / (y1-0.1858), x1=X1 / (X1+Y1+Z1), y1=Y1 / (X1+Y1+Z1), X1, Y1, Z1 are the color coordinates in the first chromaticity coordinate information corresponding to the initial grayscale image; The second chromaticity coordinate information corresponding to the solid color image of the display panel is the second chromaticity coordinate information corresponding to a portion of the solid color image of the display panel. The step of determining the compensation color temperature data of the display panel based on the second chromaticity coordinate information includes: performing linear interpolation on the second chromaticity coordinate information corresponding to a portion of the solid color image of the display panel to obtain the chromaticity matrix of the display panel; determining, based on the chromaticity matrix, the fourth chromaticity coordinate information corresponding to the compensation grayscale image when any two sub-pixels among the red, blue, and green sub-pixels have the same grayscale; determining, based on the chromaticity matrix, the fifth chromaticity coordinate information corresponding to the compensation grayscale image when at least two sub-pixels among the red, blue, and green sub-pixels have different grayscale; determining, based on the fourth and fifth chromaticity coordinate information, the third chromaticity coordinate information corresponding to each compensation grayscale image of the display panel; and determining the compensation color temperature data of the display panel based on the third chromaticity coordinate information. The step of determining the compensated color temperature data of the display panel based on the third chromaticity coordinate information includes: determining the full grayscale color temperature data of the display panel using a second formula; the second formula is: Wherein, CCT-FIT is the compensated color temperature data of the display panel, tmp2=(x2-0.332) / (y2-0.1858), x2=X2 / (X2+Y2+Z2), y2=Y2 / (X2+Y2+Z2), X2, Y2, Z2 are the color coordinates in the third chromaticity coordinate information corresponding to the compensated grayscale image.

2. The color temperature compensation method as described in claim 1, characterized in that, The steps of obtaining the first chromaticity coordinate information corresponding to the initial grayscale image of the display panel and the second chromaticity coordinate information corresponding to the solid color image of the display panel include: The first chromaticity coordinate information corresponding to the initial grayscale image of the display panel and the second chromaticity coordinate information corresponding to the solid color image of the display panel are obtained using a brightness sensor and a chromaticity sensor.

3. The color temperature compensation method as described in claim 1, characterized in that, The step of matching the full grayscale color temperature data of the display panel with the compensated color temperature data to determine the corrected chromaticity data of the display panel includes: Based on the full grayscale color temperature data of the display panel, determine the standard color temperature data of the display panel; The standard color temperature data and the compensated color temperature data of the display panel are matched to determine the corrected colorimetric data of the display panel.

4. The color temperature compensation method as described in claim 3, characterized in that, After determining the standard color temperature data of the display panel based on the full grayscale color temperature data of the display panel, the method further includes: The grayscale color temperature data of the display panel is compared with the standard color temperature data to determine the difference between the grayscale color temperature data of the display panel and the standard color temperature data. Based on the difference between each grayscale color temperature data and the standard color temperature data, the second chromaticity coordinate information is adjusted to obtain the adjusted second chromaticity coordinate information; The adjusted compensation color temperature data is obtained based on the adjusted second chromaticity coordinate information.

5. A display device using the color temperature compensation method as described in any one of claims 1 to 4, the display device comprising a driving system and a display panel linked to the driving system, characterized in that, The drive system includes: The measurement module is used to acquire the first chromaticity coordinate information corresponding to the initial grayscale image of the display panel and the second chromaticity coordinate information corresponding to the solid color image of the display panel. The calculation module is used to determine the full grayscale color temperature data of the display panel based on the first chromaticity coordinate information and to determine the compensated color temperature data of the display panel based on the second chromaticity coordinate information. The compensation module is used to match the full grayscale color temperature data of the display panel with the compensated color temperature data to determine the corrected chromaticity data of the display panel and to perform chromaticity compensation on the display panel based on the corrected chromaticity data.

Images