Display calibration method, calibration system of display panel and display device

Abstract

The application discloses a display calibration method, a calibration system of a display panel and a display device. The method is applied to a display panel, a display area of the display panel includes at least three display partitions, the at least three display partitions include a first display partition and a second display partition, and the method includes the following steps: obtaining a gamma compensation table corresponding to each second display partition according to first brightness chroma data of the first display partition and second brightness chroma data of the second display partition; compensating brightness values and chroma values of the second display partition according to the gamma compensation table; and performing colorimetric correction on the display area according to a three-dimensional color lookup table obtained after the brightness values and the chroma values are adjusted. The application performs colorimetric consistency correction on the panel, reduces color deviation, improves brightness chroma uniformity, and improves display effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display panel driving, in particular to a display calibration method, a calibration system of a display panel and a display device. BACKGROUND

[0002] With the development of technology, the development of display technology is also changing rapidly, from black and white to color to high dynamic range imaging (High Dynamic Range Imaging, HDR), and people's pursuit of display effect is also getting higher and higher.

[0003] Due to the uneven hardware level of display, the color performance of the same display area on different displays may be different, causing great inconvenience. Therefore, the current display basically contains color difference ΔE requirements. Color difference ΔE is a standard for quantifying the difference between the display color and the original color of the input content, and the smaller the ΔE, the smaller the color difference. In order to get more accurate display effect, it is often necessary to calibrate the display effect of the display panel. SUMMARY

[0004] The embodiments of the present application provide a display calibration method, a calibration system of a display panel and a display device, which solve the problem that the display effect of the display panel cannot be displayed uniformly.

[0005] In a first aspect, the present application provides a display calibration method applied to a display panel, wherein the display area of the display panel includes at least three display partitions, the at least three display partitions include a first display partition and a second display partition, the first display partition is located in the center area of the at least three display partitions, and the second display partition is a display partition in the at least three display partitions except the first display partition, and the method comprises:

[0006] According to the first brightness and chroma data of the first display partition and the second brightness and chroma data of the second display partition, a gamma compensation table corresponding to each second display partition is obtained;

[0007] According to the gamma compensation table, the brightness value and the chroma value of the second display partition are compensated respectively;

[0008] According to the three-dimensional color lookup table obtained after adjusting the brightness value and the chroma value, the color difference of the display area is corrected.

[0009] In some embodiments, the gamma compensation table corresponding to each second display partition is obtained according to the first brightness and chroma data of the first display partition and the second brightness and chroma data of the second display partition, which comprises:

[0010] obtaining first brightness and chroma data of the first display partition and second brightness and chroma data of the second display partition;

[0011] obtaining first display parameters of the first display partition and second display parameters of the second display partition according to the first brightness and chroma data and the second brightness and chroma data respectively;

[0012] obtaining a gamma compensation table corresponding to each of the second display partitions according to the first display parameters and the second display parameters.

[0013] In some embodiments, the obtaining the first brightness and chroma data of the first display partition and the second brightness and chroma data of the second display partition comprises:

[0014] obtaining original brightness and chroma data corresponding to a preset picture displayed by the display panel;

[0015] obtaining the first brightness and chroma data of the first display partition according to coordinates of each sub-pixel in the first display partition and the original brightness and chroma data;

[0016] obtaining the second brightness and chroma data of the second display partition according to coordinates of each sub-pixel in the second display partition and the original brightness and chroma data.

[0017] In some embodiments, the obtaining the first display parameters of the first display partition and the second display parameters of the second display partition according to the first brightness and chroma data and the second brightness and chroma data respectively comprises:

[0018] determining first display parameters corresponding to red, green and blue colors respectively according to the first brightness and chroma data, the first display parameters comprising first luminance values and first color coordinates;

[0019] determining second display parameters corresponding to red, green and blue colors respectively according to the second brightness and chroma data, the second display parameters comprising second luminance values and second color coordinates.

[0020] In some embodiments, the obtaining the gamma compensation table corresponding to each of the second display partitions according to the first display parameters and the second display parameters comprises:

[0021] performing difference calculation on the first display parameters corresponding to a current color in the second display partition and the second display parameters corresponding to the current color in the first display partition to obtain display difference values of each of the second display partitions and the first display partition under the current color respectively;

[0022] obtaining the gamma compensation table corresponding to each of the second display partitions according to the display difference values.

[0023] In some embodiments, the display difference value comprises a luminance value difference and a chroma value difference, and the obtaining the gamma compensation table corresponding to the second display partition according to the display difference value comprises:

[0024] obtaining a luminance compensation value corresponding to the second display partition at the current color according to the luminance value difference between the second display partition and the first display partition at the current color;

[0025] obtaining a chroma compensation value corresponding to the second display partition at the current color according to the chroma value difference between the second display partition and the first display partition at the current color;

[0026] obtaining the gamma compensation table corresponding to the second display partition according to the luminance compensation value and the chroma compensation value.

[0027] In some embodiments, the colorimetric correction of the display area according to the three-dimensional color lookup table obtained after the adjustment of the luminance value and the chroma value comprises:

[0028] obtaining the three-dimensional color lookup table according to the luminance and chroma data of the first display partition;

[0029] performing color calibration on the first display partition and the second display partition respectively according to the three-dimensional color lookup table.

[0030] In some embodiments, the obtaining the three-dimensional color lookup table comprises the steps of:

[0031] obtaining output color parameters of a preset picture;

[0032] obtaining luminance and chroma data of the first display partition after compensating the luminance value and the chroma value of the second display partition, and obtaining input color parameters according to the luminance and chroma data of the first display partition;

[0033] obtaining the three-dimensional color lookup table according to the mapping relationship between the input color parameters and the output color parameters.

[0034] In a second aspect, the present application further provides a calibration system of a display panel, wherein a display area of the display panel comprises at least three display partitions, the at least three display partitions comprise a first display partition and a second display partition, the first display partition is located in a central area of the at least three display partitions, and the second display partition is a display partition other than the first display partition in the at least three display partitions, and the system comprises:

[0035] a processing module, configured to obtain a gamma compensation table corresponding to each of the second display partitions according to the first brightness and chroma data of the first display partition and the second brightness and chroma data of the second display partition;

[0036] a compensation module, configured to compensate the brightness value and the chroma value of the second display partition according to the gamma compensation table;

[0037] a calibration module, configured to perform colorimetric correction on the display area according to the three-dimensional color lookup table obtained after adjusting the brightness value and the chroma value.

[0038] In a third aspect, the present application also provides a display device, which comprises a display panel, a memory and a processor, the memory stores a computer program, and the processor is configured to run the computer program in the memory to execute the steps in the display calibration method in the first aspect.

[0039] Beneficial effects: the present application provides a display calibration method, a calibration system of a display panel and a display device. The present application obtains the first brightness and chroma data of the first display partition and the second brightness and chroma data of the second display partition in the display panel, and then calculates the gamma compensation table corresponding to each of the second display partitions according to the first brightness and chroma data and the second brightness and chroma data. The current displayed brightness value and chroma value of the first display partition of the display panel are kept unchanged, and the voltage of each of the second display partitions is adaptively adjusted according to the corresponding gamma compensation table, so that the difference between the gray scale value and the chroma value of the adjusted second display partition and the gray scale value and the chroma value of the first display partition is reduced. Then, the three-dimensional color lookup table obtained after adjusting the brightness value and the chroma value is used to perform colorimetric ΔE correction on the displayed picture of the entire display area, so that the difference between the actual display effect and the expected display effect of the display panel is reduced, the color deviation is reduced, the brightness and chroma uniformity is improved, and the display effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0041] Figure 1 A schematic diagram of the gamma compensation table provided by the embodiments of the present application.

[0042] Figure 2 A schematic diagram of the three-dimensional color lookup table provided by the embodiments of the present application.

[0043] Figure 3 A flowchart of a display calibration method provided by an embodiment of the present application.

[0044] Figure 4 A schematic diagram of a display panel divided into nine display partitions provided by an embodiment of the present application. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0046] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms “one end”, “the other end” and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms “first”, “second” are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by “first”, “second” can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of “two or more” is two or more, unless otherwise specifically limited.

[0047] It should be pointed out that “connection” in the embodiments of the present application can be understood as electrical connection, and the connection between two electrical elements can be direct or indirect connection between the two electrical elements. For example, A is connected to B, which can be direct connection between A and B, or indirect connection between A and B through one or more other electrical elements.

[0048] In the circuit structure provided by the embodiments of the present application, the nodes such as the first node and the second node do not represent actual components, but represent the convergence points of relevant couplings in the circuit diagram, that is, these nodes are nodes equivalent to the convergence points of relevant couplings in the circuit diagram.

[0049] The following disclosure provides many different implementations or examples for carrying out 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 implementations and / or arrangements discussed. In the above embodiments, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0050] This application provides a display calibration method, a calibration system for a display panel, and a display device. The display panel in the embodiments of this application can be used in mobile phones, tablets, desktop computers, laptops, e-readers, handheld computers, electronic display screens, laptops, ultra-mobile personal computers (UMPCs), netbooks, as well as cellular phones, personal digital assistants (PDAs), augmented reality (AR) / virtual reality (VR) devices, media players, wearable devices, digital cameras, car navigation systems, etc.

[0051] The display panel can be a liquid crystal display panel. This application does not limit the type of liquid crystal display panel. The liquid crystal display panel provided in this application can be a horizontal electric field type liquid crystal display panel, such as a fringe field switching (FFS) type liquid crystal display panel or an in-plane switching (IPS) type liquid crystal display panel, or a vertical electric field type liquid crystal display panel, such as a twisted nematic (TN) type liquid crystal display panel or a multi-domain vertical alignment (MVA) type liquid crystal display panel.

[0052] One color calibration process for the display panel in this application is as follows: First, use the following... Figure 1 The set of dynamic gamma correction tables (Digital Gamma Compensation Look-Up Table, DGC LUT) shown here corrects the display panel's gamma and white point (color coordinates of white) to standard values. Then, a three-dimensional color look-up table (3D-LUT) is used to correct the color accuracy ΔE of a specific display area. The 3D-LUT format is as follows: Figure 2As shown, the whole mapping is performed by the combination of R / G / B three channels. For example, the input (50, 50, 50) corresponds to the output (70, 70, 70), and the input (50, 50, 60) corresponds to the output (70, 75, 75), etc. In this way, after the original image data passes through the 3D-LUT, each color can be mapped individually, and color correction can be achieved. However, after the color correction based on the original brightness and chroma data of the center region of the display panel, although the color accuracy of the center region of the display panel can meet the standard, the overall color accuracy of the display panel can still be problematic.

[0053] The display calibration method, the calibration system of the display panel, and the display device of the present application are described below in conjunction with the accompanying drawings to solve the above problems.

[0054] Please refer to Figure 3 A flowchart of a display calibration method provided by an embodiment of the present application is shown in FIG. 1. The display calibration method is applied to a display panel. The display region of the display panel includes at least three display partitions. The at least three display partitions include a first display partition and a second display partition. The first display partition is located in the center region of the at least three display partitions. The second display partition is a display partition other than the first display partition in the at least three display partitions, such as Figure 3 As shown, the display calibration method includes the following steps.

[0055] S100, obtaining a gamma compensation table corresponding to each of the second display partitions according to the first brightness and chroma data of the first display partition and the second brightness and chroma data of the second display partition.

[0056] S200, compensating the brightness value and the chroma value of the second display partition according to the gamma compensation table.

[0057] S300, performing color accuracy correction on the display region according to the three-dimensional color lookup table obtained after adjusting the brightness value and the chroma value.

[0058] Specifically, the display panel includes a display region and a non-display region. The display region can be divided into at least three display partitions. That is, the display panel can be configured to be divided into N display partitions, where N is a positive integer and N≥3. For example, the display region can be divided into 3, 5, 6, 9, 12, or more display partitions. For the convenience of description, an embodiment of the present application is exemplarily described by taking the display panel with 9 display partitions as shown in FIG. 2, such as Figure 4 As shown in FIG. 2, the display region of the display panel is divided into 9 display partitions, and the display region is divided into a first display partition 201, a second display partition 202, a third display partition 203, a fourth display partition 204, a fifth display partition 205, a sixth display partition 206, a seventh display partition 207, an eighth display partition 208, and a ninth display partition 209. Figure 4As shown, the display area 100 includes at least three display partitions, the at least three display partitions include one first display partition DGC_LUT 5, and eight second display partitions respectively including DGC_LUT 1 to DGC_LUT 4, DGC_LUT 6 to DGC_LUT 9. The pixel unit of the display panel can include single-color light emitting devices (i.e. sub-pixels) of multiple colors, for example, including red light emitting devices, green light emitting devices and blue light emitting devices.

[0059] The area size of the at least three display partitions can be the same or different. The display area can be equally divided to obtain at least three display partitions with the same area size, or the display area can be divided to obtain one first display partition with an area size of a first value, and N-1 second display partitions surrounding the first display partition and having an area size of a second value, as mentioned in the following embodiments. The position or size of the first display partition can be set as needed for different display panels. For example, the first display partition of each display panel of the same batch and same specification type can be the same during the collection process.

[0060] The bright chrominance data can include a brightness value and chrominance data, and the chrominance data includes the hue and saturation of the color. The first bright chrominance data of the first display partition and the second bright chrominance data of the second display partition are obtained first, and then the respective gamma compensation tables of the respective second display partitions are calculated according to the first bright chrominance data and the second bright chrominance data through steps S110 to S130 in the following embodiments. While keeping the brightness value and chrominance value of the currently displayed image of the first display partition of the display panel unchanged, the voltage of each second display partition is adaptively adjusted according to the respective corresponding gamma compensation table, so that the difference between the brightness value and chrominance value of the adjusted second display partition and the brightness value and chrominance value of the first display partition is reduced. In this way, under the premise that the brightness value and chrominance value of the first display partition and the second display partition, i.e. the entire display area of the display panel, are basically the same, i.e. the difference between the brightness value of the first display partition and the brightness value of the second display partition is less than a first threshold value, and the difference between the chrominance value of the first display partition and the chrominance value of the second display partition is less than a second threshold value, the three-dimensional color lookup table obtained through steps S310 to S320 in the following embodiments is used to correct the color difference ΔE of the displayed image of the entire display area of the display panel, so that the difference between the actual display effect and the expected display effect of the display panel is reduced, the color deviation is reduced, the bright chrominance uniformity is improved, and the display effect is improved.

[0061] In some embodiments of the present application, the S100, obtaining the respective gamma compensation table corresponding to each second display partition according to the first bright chrominance data of the first display partition and the second bright chrominance data of the second display partition includes:

[0062] S110, acquire first brightness and chroma data of the first display partition and second brightness and chroma data of the second display partition;

[0063] S120, acquire first display parameter of the first display partition and second display parameter of the second display partition according to the first brightness and chroma data and the second brightness and chroma data respectively;

[0064] S130, obtain a respective gamma compensation table corresponding to each of the second display partitions according to the first display parameter and the second display parameter.

[0065] Specifically, when the display panel displays a picture, if only the actual brightness value and the target brightness value of the display panel are acquired, and compensation display is performed according to the difference between the actual brightness value and the target brightness value, only the brightness uniformity of the display panel can be achieved, and the chroma value uniformity of the display panel cannot be ensured. Therefore, the first display parameter and the second display parameter acquired in the embodiments of the present application include the brightness value and the color coordinate mentioned in the embodiments below, that is, the first display parameter includes the first brightness value and the first color coordinate of the first display partition, and the second display parameter includes the second brightness value and the second color coordinate of the second display partition. The first display parameter can be obtained according to the first brightness value and the first color coordinate of the first display partition, and the second display parameter can be obtained according to the second brightness value and the second color coordinate of the second display partition.

[0066] In the embodiments of the present application, the first display parameter of the first display partition located at the center point position of the display area of the display panel is acquired as a reference for adjusting the chroma value uniformity of the display panel. In some embodiments, the first display parameter of the first display partition can be set as a standard display parameter of the display module, and the standard display parameter refers to a required value, which can be set according to the use requirement or user preference. In the embodiments of the present application, in order to achieve the uniformity of the display panel, the first display parameter of the first display partition located at the center region of the display area can be selected as a standard display parameter for adjusting the second display partition as a reference, so that the respective gamma compensation table corresponding to each of the second display partitions can be calculated according to the difference between the first display parameter and the second display parameter.

[0067] In some embodiments of the present application, S110, the acquisition of the first brightness and chroma data of the first display partition and the second brightness and chroma data of the second display partition includes:

[0068] S111, acquire original brightness and chroma data corresponding to a preset picture displayed by the display panel;

[0069] S112, obtain first brightness chroma data of the first display partition according to the coordinates of each sub-pixel in the first display partition and the original brightness chroma data;

[0070] S113, obtain second brightness chroma data of the second display partition according to the coordinates of each sub-pixel in the second display partition and the original brightness chroma data.

[0071] Specifically, the preset picture includes a pure color picture and a non-pure color picture, and the pure color picture includes a pure red picture, a pure green picture, a pure blue picture, a pure white picture, etc. The original brightness chroma data can be obtained by using an imaging assembly to take a picture of the display panel displaying the preset picture, and obtaining a target image when the display panel displays the preset picture at the maximum gray scale brightness, and obtaining the original brightness chroma data according to the target image. The imaging assembly can be a camera, a camera, or other photographing equipment. The shortest distance from the optical center of the lens of the imaging assembly to the display panel is less than the normal working distance of the imaging assembly. In this embodiment, the normal working distance of the imaging assembly is the working distance of the imaging assembly when the area of the display panel captured by the imaging assembly has no image distortion or the image distortion is at the minimum.

[0072] After obtaining the target image from the imaging assembly, the original brightness chroma data corresponding to each pixel unit to which all pixel points in the target image belong is extracted from the target image. The original brightness data includes brightness value and chroma data. The brightness value refers to the brightness of the image. For a gray scale image, the image brightness value is the image gray scale value, and the gray scale value ranges from 0 to 255. The gray scale value is directly proportional to the brightness value, that is, the higher the gray scale value, the brighter the image. Therefore, the target image can be processed to obtain the gray scale value of each pixel point in the target image, so that the corresponding brightness value can be obtained.

[0073] Of course, the process of obtaining the brightness value can also be to extract the three primary color components of the target image. Each pixel point has three components, which respectively represent the red, blue, and green gray scale values of the pixel point color. The brightness of the pixel point is calculated according to the three primary color components, that is, the red, blue, and green gray scale values of the pixel point are converted, and the corresponding brightness value of the pixel point is calculated and obtained, for example, the formula is:

[0074] L = a1*R + a2*G + a3*B

[0075] In the formula, R represents the gray scale value of red, G represents the gray scale value of green, B represents the gray scale value of blue, and a1, a2, and a3 are constant coefficients.

[0076] After the display panel displays the preset picture with the preset gray scale value brightness and the original brightness chrominance data corresponding to the preset picture is obtained, since the target image includes the display panel, each pixel point in the target image corresponds to a sub-pixel in the display panel, and thus the first brightness chrominance data of the first display partition can be searched from the original brightness chrominance data according to the conversion relationship between the coordinates of each sub-pixel in the first display partition and the image coordinates of the sub-pixel in the target image. Similarly, the second brightness chrominance data of the second display partition can also be searched from the original brightness chrominance data according to the conversion relationship between the coordinates of each sub-pixel in the second display partition and the image coordinates of the sub-pixel in the target image.

[0077] Preferably, since the imaging assembly can not be located directly in front of the display panel, the brightness of different regions of the target image can be distorted due to deviation. Therefore, after the target image is obtained, the target image is corrected in terms of viewing angle, and then the original brightness chrominance data corresponding to all pixel points in the target image after the viewing angle correction is extracted, so that the problem of affecting the compensation effect due to the image brightness distortion of the display panel can be solved.

[0078] In some embodiments of the present application, the S120 and the acquiring of the first display parameter of the first display partition and the second display parameter of the second display partition according to the first brightness chrominance data and the second brightness chrominance data respectively include:

[0079] S121, determining the first display parameter corresponding to each of red, green and blue colors according to the first brightness chrominance data, the first display parameter including a first brightness value and a first color coordinate;

[0080] S122, determining the second display parameter corresponding to each of red, green and blue colors according to the second brightness chrominance data, the second display parameter including a second brightness value and a second color coordinate.

[0081] Specifically, the color coordinate (chromaticity coordinate) is a color coordinate, also called a color system or chrominance coordinate. The color coordinate is used to determine a point on a chromaticity diagram to accurately represent the hue and saturation of a color, which is generally represented by (x, y). In the color coordinate, the horizontal coordinate is represented as x and the vertical coordinate is represented as y. With the color coordinate, a point (x, y) can be determined on the chromaticity diagram, which accurately represents the color of the light, i.e., the color coordinate accurately represents the color.

[0082] It should be noted that in the embodiments of the present application, chromaticity coordinates are used to represent the chromaticity of colors, and luminance values are used to represent the luminance of colors, for example, the chromaticity value and luminance value of a color can be directly represented in the form of xyz, wherein xy represents the chromaticity coordinate, and z represents the luminance value. The chromaticity coordinate (x, y) and luminance value z of each pixel unit in the display area of the display panel can be measured by a chromaticity measuring instrument, wherein each pixel unit is composed of three primary color sub-pixels, i.e., a red sub-pixel R, a green sub-pixel G and a blue sub-pixel B, and each primary color sub-pixel includes a chromaticity coordinate and a luminance value.

[0083] All red sub-pixels of the display area of the display panel are controlled to display a red pure color picture, the first luminance value z1 and the first chromaticity coordinate (x1, y1) of the first display partition when displaying the red pure color picture are measured by the chromaticity measuring instrument, the first chromaticity value (x1, y1, z1) of the red color is converted based on the standard chromaticity system conversion relationship, i.e., the conversion relationship between the CIE-RGB system and the CIE-XYZ system (for example, CIE1931 or CIE2932), and the first chromaticity value of the red color corresponding to the first display parameter of the first display partition is further obtained. Similarly, the second luminance value z2 and the second chromaticity coordinate (x2, y2) of the second display partition when displaying the red pure color picture are converted into the second chromaticity value (x2, y2, z2) of the red color based on the standard chromaticity system conversion relationship, and the second chromaticity value of the red color corresponding to the second display parameter of the first display partition is further obtained. Similarly, the first display parameter corresponding to the blue color and the first display parameter corresponding to the green color of the first display partition can be obtained respectively, and the second display parameter corresponding to the blue color and the second display parameter corresponding to the green color of the second display partition can be obtained respectively.

[0084] In some embodiments of the present application, the S130, according to the first display parameter and the second display parameter, obtains the gamma compensation table corresponding to each of the second display partitions, includes:

[0085] S131, the first display parameter corresponding to the current color in the second display partition and the second display parameter corresponding to the current color in the first display partition are calculated by difference, and the display difference value of each of the second display partitions and the first display partition under the current color is obtained;

[0086] S132, the gamma compensation table corresponding to the second display partition is obtained according to the display difference value.

[0087] Specifically, the first display parameter of the first display partition can be set as a standard luminance parameter and a standard chroma value parameter of the display module. The standard display parameter refers to a required value, which can be set according to a use requirement or a user preference. In implementation, a preset luminance value and a preset chroma value can be provided as the design requirement of the display module according to actual conditions.

[0088] In the embodiments of the present application, in order to realize the uniformity of the display panel, the first luminance value of the first display partition in the central region in the display region can be selected as the preset luminance value, and the first chroma value of the first display partition can be selected as the preset chroma value. The display difference value between the first display partition and any second display partition in the red channel can be obtained by difference calculation of the second display parameter corresponding to the red color of the second display partition and the first display parameter corresponding to the red color of the first display partition. Similarly, the display difference values between the first display partition and the second display partition in the green channel and the blue channel can be obtained. Then, the gamma compensation table corresponding to the current second display partition can be obtained according to the respective display difference values of the current second display partition in the red, green and blue color channels. In this way, the gamma compensation table corresponding to each second display partition can be obtained.

[0089] In some embodiments of the present application, the display difference value includes a luminance value difference and a chroma value difference, and the gamma compensation table corresponding to the second display partition is obtained according to the display difference value, including:

[0090] obtaining a luminance compensation value corresponding to the second display partition in the current color according to the luminance value difference between the second display partition and the first display partition in the current color;

[0091] obtaining a chroma compensation value corresponding to the second display partition in the current color according to the chroma value difference between the second display partition and the first display partition in the current color;

[0092] obtaining the gamma compensation table corresponding to the second display partition according to the luminance compensation value and the chroma compensation value.

[0093] Specifically, the original color value can be an RGB value, where R represents the red component of the color, G represents the green component of the color, and B represents the blue component of the color. After the display panel obtains the display signal, the display value of the output signal of the display panel on the display panel, i.e., the color coordinates and the luminance value (x, y, z), is the result of the simultaneous action of the color components in the original color, i.e., the R component, the G component and the B component. The three color components have different effects on the final color coordinates and luminance value, and the increase of a single component in the three color components has a monotonic effect on the horizontal coordinate component x of the final color coordinates, the vertical coordinate component y of the color coordinates and the luminance value z.

[0094] Therefore, the first difference value can be obtained by calculating the difference between the abscissa component of the first display parameter in the red channel corresponding to the first display partition and the abscissa component of the second display parameter in the red channel corresponding to the current second display partition, the second difference value can be obtained by calculating the difference between the ordinate component of the first display parameter in the red channel corresponding to the first display partition and the ordinate component of the second display parameter in the red channel corresponding to the current second display partition, and thus the first difference value and the second difference value are the chroma value difference. The third difference value, which is the luminance value difference, can be obtained by calculating the difference between the luminance value of the first display parameter in the red channel corresponding to the first display partition and the luminance value of the second display parameter in the red channel corresponding to the current second display partition. According to the chroma value difference and the luminance value difference corresponding to the first display partition and the current second display partition in the red channel, the luminance compensation value and the chroma compensation value for adjusting the red channel of the current second display partition to be substantially consistent with the luminance value and the chroma value of the red channel of the first display partition can be obtained. Similarly, the luminance compensation value and the chroma compensation value for adjusting the green channel of the current second display partition to be substantially consistent with the luminance value and the chroma value of the green channel of the first display partition can be obtained, and the luminance compensation value and the chroma compensation value for adjusting the blue channel of the current second display partition to be substantially consistent with the luminance value and the chroma value of the blue channel of the first display partition can be obtained, so that the luminance compensation value and the chroma compensation value for adjusting the luminance value and the chroma value of the current second display partition to be substantially consistent with the luminance value and the chroma value of the first display partition in the red, green and blue color channels can be obtained. The gamma compensation table includes the luminance compensation value and the chroma compensation value corresponding to each of the red, green and blue colors.

[0095] In some embodiments of the present application, the three-dimensional color lookup table obtained after adjusting the luminance value and the chroma value is used to perform color matching on the display area, including:

[0096] S310, obtaining the three-dimensional color lookup table according to the luminance and chroma data of the first display partition;

[0097] S320, performing color calibration on the first display partition and the second display partition respectively according to the three-dimensional color lookup table.

[0098] Specifically, referring to the above embodiments S100 to S200, in the case that the display panel displays a preset picture, the luminance and chrominance of each second display partition are adjusted according to the gamma compensation table corresponding to each second display partition, and the luminance value and chrominance value of each second display partition of the display area are adjusted to be substantially consistent with the luminance value and chrominance value of the first display partition. After that, under the premise that the preset picture displayed by the display panel remains unchanged, the luminance and chrominance data corresponding to the first display partition are measured in real time using a chrominance measuring instrument. In order to realize the uniformity of the display panel, a three-dimensional color lookup table corresponding to the first display partition can be obtained according to the adjusted luminance and chrominance data. Then, the correction data for the first display partition is obtained according to the three-dimensional color lookup table of the first display partition and the luminance and chrominance data of the first display partition, and the color accuracy of the first display partition is calibrated according to the correction data of the first display partition. Similarly, the correction data for the current second display partition is obtained according to the three-dimensional color lookup table of the first display partition and the adjusted luminance and chrominance data of the current second display partition, and the color accuracy of the current second display partition is calibrated according to the correction data of the current second display partition.

[0099] For example, after the luminance value and chrominance value of the second display partition are substantially consistent with the luminance value and chrominance value of the first display partition, the input color parameter of any one pixel point in the first display partition is obtained according to the luminance and chrominance data of the first display partition. The corresponding output color parameter can be found from the three-dimensional color lookup table according to the input color parameter of any one pixel point in the first display partition. The color parameter difference between the found input color parameter and output color parameter is taken as the color calibration data thereof. Similarly, the color calibration data of each sub-pixel in the first display partition can be obtained. Then, the sub-pixels corresponding to the first display partition are calibrated according to the color calibration data corresponding to each sub-pixel in the first display partition. Similarly, the color calibration data of each sub-pixel in the second display partition can be obtained. Then, the sub-pixels corresponding to the second display partition are calibrated according to the color calibration data corresponding to each sub-pixel in the second display partition. The 3D-LUT contains the mapping relationship between the input color parameters and output color parameters of different colors. When a color needs to be displayed, the required color calibration data is found in the 3D-LUT for display, so that the final actual display effect is the same as the required display effect.

[0100] In some embodiments of the present application, the three-dimensional color lookup table is obtained by the following steps:

[0101] S311, obtaining the output color parameter of the preset picture;

[0102] S312, after compensating the luminance value and chrominance value of the second display partition, obtaining the luminance and chrominance data of the first display partition, and obtaining the input color parameter according to the luminance and chrominance data of the first display partition;

[0103] S313, obtaining the three-dimensional color lookup table according to the mapping relationship between the plurality of input color parameters and the output color parameters.

[0104] Specifically, a three-dimensional color lookup table 3D-LUT is created, which includes a plurality of input color parameters and a plurality of output color parameters of the display panel and a mapping relationship therebetween. In summary, the 3D-LUT is a lookup table containing a mapping relationship between input color parameters and output color parameters established according to color deviation of a display panel displaying a picture. In essence, the output color parameter is a standard color parameter required to be displayed, wherein the standard color parameter is a color parameter of a standard color. Both the input color parameter and the output color parameter refer to three stimulus values of a pixel point, i.e., a red value (R), a green value (G), and a blue value (B). In the 3D-LUT, there are RGB channels in each coordinate direction. For example, an input color parameter (R in , G in , B in ) signal is converted by the 3D-LUT to become an output color parameter (R out , G out , B out ). The output color parameter (R out , G out , B out ) after conversion is the target display effect of the display panel, i.e., the effect required to be displayed.

[0105] For example, if the display panel displays a pure red picture, the output color parameter of any pixel point in the display panel is (255, 0, 0). Similarly, if the display panel displays a pure blue picture, the output color parameter of any pixel point in the display panel is (0, 0, 255), and if the display panel displays a pure green picture, the output color parameter of any pixel point in the display panel is (0, 255, 0).

[0106] Referring to the above embodiments S100-S200, the display panel is controlled to display different preset pictures with uniform preset gray scale luminance. After obtaining the plurality of input color parameters, a preset picture corresponding to a preset color (or preset color gamut) can be displayed by the display panel. In the case that the preset picture is displayed by the display panel, the luminance value and the chrominance value of each second display partition of the display area are adjusted to be substantially consistent with the luminance value and the chrominance value of the first display partition according to the gamma compensation table corresponding to each second display partition. After the luminance value and the chrominance value of each second display partition of the display area are adjusted, the luminance and chrominance data corresponding to the first display partition of the preset color (or preset color gamut) are measured in real time by using a chrominance measuring instrument without changing the preset picture displayed by the display panel. The input color parameter of any current sub-pixel of the first display partition can be obtained according to the luminance and chrominance data corresponding to the first display partition. Then, a group of mapping relationships of the preset color (or preset color gamut) can be obtained according to the input color parameter of the sub-pixel of the first display partition and the standard color parameter (output color parameter) corresponding to the preset picture. Similarly, a plurality of groups of mapping relationships of different preset colors (or preset color gamuts) can be obtained, and then a three-dimensional color lookup table of the first display partition can be obtained.

[0107] In the embodiments of the present application, it is assumed that the display area is a standard rectangular or square display area for convenience of division. For an irregular display area, a small rectangle or a small square with equal area is used for processing, for example, the irregular display area is divided into a plurality of small squares as display partitions.

[0108] The embodiments of the present application also provide a display panel calibration system. The display area of the display panel includes at least three display partitions, the at least three display partitions include a first display partition and a second display partition, the first display partition is located in a central region of the at least three display partitions, and the second display partition is a display partition other than the first display partition in the at least three display partitions. The system includes:

[0109] A processing module is configured to obtain a gamma compensation table corresponding to each second display partition according to the first luminance and chrominance data of the first display partition and the second luminance and chrominance data of the second display partition.

[0110] A compensation module is configured to compensate the luminance value and the chrominance value of the second display partition according to the gamma compensation table.

[0111] A calibration module is configured to perform color correction on the display area according to the three-dimensional color lookup table obtained after the adjustment of the luminance value and the chrominance value.

[0112] The embodiment of the present application further provides a display panel, the display device comprises a display panel, a memory and a processor, the memory stores a computer program, and the processor is used for running the computer program in the memory to execute the steps in the display calibration method described in the corresponding embodiment of the figure.

[0113] The embodiment of the present application further provides a display panel, the storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor to execute the steps in the display calibration method described in the corresponding embodiment of the figure.

[0114] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0115] The display calibration method, the calibration system of the display panel and the display device provided by the embodiments of the present application are described in detail above, and the principles and implementation manners of the present application are described by applying specific examples in this paper. The above embodiment is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation manner and application range will be changed, and the above description should not be understood as the limitation of the present application. Moreover, for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which are also regarded as the protection scope of the present application.

Claims

1. A display calibration method, characterized by, The application is applied to a display panel, a display area of the display panel comprises at least three display partitions, the at least three display partitions comprise a first display partition and a second display partition, the first display partition is located in a central area of the at least three display partitions, and the second display partition is a display partition other than the first display partition in the at least three display partitions, and the method comprises the following steps: According to first brightness and chroma data of the first display partition and second brightness and chroma data of the second display partition, a gamma compensation table corresponding to each second display partition is obtained; According to the gamma compensation table, brightness values and chroma values of the second display partition are compensated respectively; According to a three-dimensional color lookup table obtained after brightness values and chroma values are adjusted, colorimetric correction is performed on the display area; The method comprises the following steps: First brightness and chroma data of the first display partition and second brightness and chroma data of the second display partition are obtained; First display parameters of the first display partition and second display parameters of the second display partition are obtained respectively according to the first brightness and chroma data and the second brightness and chroma data; A display difference value of each second display partition under a current color is obtained by performing difference calculation on the second display parameters corresponding to the current color in the second display partition and the first display parameters corresponding to the current color in the first display partition; A gamma compensation table corresponding to the second display partition is obtained according to the display difference value.

2. The display calibration method of claim 1, wherein, The method comprises the following steps: Original brightness and chroma data corresponding to a preset picture displayed by the display panel are obtained; First brightness and chroma data of the first display partition are obtained according to coordinates of each sub-pixel in the first display partition and the original brightness and chroma data; Second brightness and chroma data of the second display partition are obtained according to coordinates of each sub-pixel in the second display partition and the original brightness and chroma data.

3. The display calibration method of claim 1, wherein, The method comprises the following steps: First display parameters of the first display partition and second display parameters of the second display partition are obtained respectively according to the first brightness and chroma data and the second brightness and chroma data; First display parameters of the first display partition and second display parameters of the second display partition are obtained respectively according to the first brightness and chroma data and the second brightness and chroma data; 4. The display calibration method of claim 1, wherein, The display difference value comprises a brightness value difference and a chroma value difference, and the method comprises the following steps: A brightness compensation value corresponding to the second display partition under the current color is obtained according to a brightness value difference between the second display partition and the first display partition under the current color. obtaining a chroma compensation value corresponding to the second display partition at the current color according to a difference between the chroma values of the second display partition and the first display partition at the current color; obtaining a gamma compensation table corresponding to the second display partition according to the luminance compensation value and the chroma compensation value.

5. The display calibration method of any one of claims 1 to 4, wherein, The three-dimensional color lookup table obtained after adjusting the luminance value and the chroma value is used for colorimetric correction of the display area, including: obtaining the three-dimensional color lookup table according to the luminance and chroma data of the first display partition; colorimetrically calibrating the first display partition and the second display partition according to the three-dimensional color lookup table.

6. The display calibration method of claim 5, wherein, The three-dimensional color lookup table includes the following steps: obtaining output color parameters of a preset picture; obtaining luminance and chroma data of the first display partition after compensating the luminance value and the chroma value of the second display partition, and obtaining input color parameters according to the luminance and chroma data of the first display partition; obtaining the three-dimensional color lookup table according to the mapping relationship between the input color parameters and the output color parameters.

7. A calibration system of a display panel, characterized by, The display area of the display panel includes at least three display partitions, the at least three display partitions include a first display partition and a second display partition, the first display partition is located in a central area of the at least three display partitions, and the second display partition is a display partition other than the first display partition in the at least three display partitions, and the system includes: a processing module, configured to obtain a gamma compensation table corresponding to each of the second display partitions according to first luminance and chroma data of the first display partition and second luminance and chroma data of the second display partition; a compensation module, configured to compensate luminance values and chroma values of the second display partitions according to the gamma compensation table; a calibration module, configured to perform colorimetric correction on the display area according to a three-dimensional color lookup table obtained after adjusting luminance values and chroma values. The processing module obtains a gamma compensation table corresponding to each of the second display partitions according to first luminance and chroma data of the first display partition and second luminance and chroma data of the second display partition, including: obtaining first luminance and chroma data of the first display partition and second luminance and chroma data of the second display partition; obtaining first display parameters of the first display partition and second display parameters of the second display partition according to the first luminance and chroma data and the second luminance and chroma data, respectively; calculating a difference between the second display parameters corresponding to the current color in the second display partition and the first display parameters corresponding to the current color in the first display partition to obtain display difference values of each of the second display partitions and the first display partition at the current color; obtaining a gamma compensation table corresponding to the second display partition according to the display difference values.

8. A display device, characterized by comprising: The display device includes a display panel, a memory, and a processor, the memory stores a computer program, and the processor is configured to run the computer program in the memory to execute the steps in the display calibration method of any one of claims 1 to 6.

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