Color compensation method and device of display panel, display panel

Abstract

This application provides a color compensation method and apparatus for a display panel, and a display panel in general. The method includes obtaining a set of full grayscale compensation coefficients for a standard display panel sample; the set of full grayscale compensation coefficients includes the XYZ tristimulus value compensation coefficients for all color channels of each grayscale in the standard display panel sample; compensating the grayscale bound point tristimulus value curves of the experimental display panel sample based on the set of full grayscale compensation coefficients to obtain the XYZ tristimulus compensation value of the display panel under test in a preset standard colorimetric system under full grayscale; and obtaining an automatic calibration parameter table for the display panel under test based on this value. By fitting the full grayscale feature distribution based on feature grayscale points, the panel gamma adjustment and color temperature adjustment are efficiently completed, while ensuring the linearity of both, significantly improving the consistency of display quality and adjustment efficiency.

Description

Technical Field

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

[0002] Currently, mainstream display technologies all control the color presentation of display units through electrical signals. During display control and human eye observation, because both the electro-optical transfer function of the display device and the visual response function of the human eye are non-linearly distributed, it is necessary to perform Picture Quality (PQ) calibration on the display device to ensure accurate and consistent display effects.

[0003] Currently, Liquid Crystal Display (LCD) panels achieve color imaging by independently controlling sub-pixels equipped with three primary color photoresists. The industry typically uses a central wafer as a benchmark to complete initial data adjustments, including gamma voltage, Adaptive Color Control (ACC) for precise color control, and Overdrive (OD) for dynamic acceleration. Then, the LCD panel's AutoPanel Gamma correction production line automatically matches the grayscale gamma voltage to compensate for differences in the panel's gamma curve caused by manufacturing process fluctuations. However, due to production cycle constraints, current gamma calibration typically selects 3 to 5 characteristic grayscale binding points for adjustment. This results in a significant deviation between the electro-optical transmission curve fitted based on these calibration points and the actual characteristics of the panel, further hindering the display panel from meeting high-quality display requirements. Therefore, there is an urgent need for a color compensation method for display panels to compensate for the color of the displayed image. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this application is to provide a color compensation method and device for a display panel, and a display panel, to solve the problems of poor color temperature consistency caused by relying solely on brightness adjustment and ignoring grayscale white balance in the current display panel gamma adjustment, as well as the limitations of production cycle, insufficient feature binding points, and large deviation between the fitted curve and the actual electro-optical characteristics of the panel.

[0005] The first aspect of this application provides a color compensation method for a display panel, including: Obtain the full grayscale compensation coefficient set of the standard display panel sample, wherein the full grayscale compensation coefficient set includes the XYZ tristimulus value compensation coefficients of all color channels of each grayscale in the standard display panel sample. Obtain the measured values ​​of the XYZ tristimulus at each grayscale binding point of the display panel under preset conditions in a preset standard color system. Based on the measured values ​​of the XYZ tristimulus at each grayscale binding point of the display panel under preset conditions in a preset standard color system, obtain the grayscale binding point tristimulus value curve of the display panel under test. The grayscale binding point tristimulus value curve includes the XYZ tristimulus fitting values ​​of the full grayscale preset standard color system of the display panel under test. Based on the set of full grayscale compensation coefficients, the XYZ tristimulus fitting values ​​under the full grayscale preset standard color system in the grayscale bound point tristimulus value curve of the display panel under test are compensated to obtain the XYZ tristimulus compensation values ​​of the display panel under test under the preset standard color system in full grayscale. Based on the XYZ tristimulus compensation values ​​of the display panel under test in the preset standard color system under full grayscale, the automatic correction parameter table of the display panel under test is obtained so that the display panel under test can complete the screen display according to the automatic correction parameter table. The preset conditions include turning off the automatic color correction module.

[0006] In some embodiments of this application, obtaining the set of full grayscale compensation coefficients for a standard display panel sample includes: Obtain the measured XYZ tristimulus values ​​of the standard display panel sample under a preset standard chromaticity system with full grayscale under preset conditions, and fit the measured XYZ tristimulus values ​​of the standard display panel sample at each grayscale binding point under the preset standard chromaticity system to obtain the grayscale binding point tristimulus value curve of the standard display panel sample. Based on the measured values ​​of the XYZ tristimulus and the grayscale bound point tristimulus value curves under the full grayscale preset standard color system of the standard display panel sample, a set of full grayscale compensation coefficients is obtained.

[0007] In some embodiments of this application, a set of full grayscale compensation coefficients is obtained based on the measured XYZ tristimulus values ​​and grayscale bound-point tristimulus value curves under the full grayscale preset standard chromaticity system of the standard display panel sample, including: For a color channel of a gray level of the standard display panel sample, the measured values ​​of the XYZ tristimulus under the corresponding preset standard color system and the fitted values ​​of the XYZ tristimulus under the corresponding preset standard color system in the gray level bound point tristimulus value curve are respectively calculated by ratio to obtain the XYZ tristimulus compensation coefficient of the corresponding color channel of the corresponding gray level. The set of XYZ tristimulus compensation coefficients for all color channels of a gray level of the standard display panel sample is the compensation coefficient group for the corresponding gray level, and the set of compensation coefficient groups for all gray levels of the standard display panel sample is the full gray level compensation coefficient set.

[0008] In some embodiments of this application, a set of full grayscale compensation coefficients is obtained based on the measured XYZ tristimulus values ​​and grayscale bound-point tristimulus value curves under the full grayscale preset standard chromaticity system of the standard display panel sample, including: The grayscale that meets the preset difference condition in the standard display panel sample is taken as the first grayscale, and the grayscale that does not meet the preset difference condition is taken as the second grayscale. The preset difference condition is that the difference between the measured value of the XYZ tristimulus under the preset standard color system corresponding to the same grayscale in the standard display panel sample and the fitted value of the XYZ tristimulus under the preset standard color system in the grayscale bound point tristimulus value curve is greater than a preset threshold. For a color channel of the first grayscale in the standard display panel sample, the measured values ​​of the XYZ tristimulus under the corresponding preset standard colorimetric system and the fitted values ​​of the XYZ tristimulus under the corresponding preset standard colorimetric system in the grayscale bound point tristimulus value curve are respectively calculated by ratio to obtain the XYZ tristimulus compensation coefficient of the color channel corresponding to the first grayscale; the XYZ tristimulus compensation coefficients corresponding to each color channel of the second grayscale in the standard display panel sample are all set to the first value. The set of XYZ tristimulus compensation coefficients for all color channels of a gray level of the standard display panel sample is the compensation coefficient group for the corresponding gray level, and the set of compensation coefficient groups for all gray levels of the standard display panel sample is the full gray level compensation coefficient set.

[0009] In some embodiments of this application, the XYZ tristimulus fitting values ​​under a preset standard chromaticity system in the grayscale bound-point tristimulus value curve of the display panel under test are compensated based on the full grayscale compensation coefficient set, resulting in the XYZ tristimulus compensation values ​​of the display panel under test in the preset standard chromaticity system under full grayscale, including: For a color channel of a gray level of the display panel under test, the XYZ tristimulus fitting value under the preset standard color system is multiplied by the XYZ tristimulus compensation coefficient of the corresponding color channel of the corresponding gray level in the full gray level compensation coefficient set, respectively, to obtain the XYZ tristimulus compensation value of the corresponding color channel of the gray level of the display panel under test under the preset standard color system.

[0010] In some embodiments of this application, when fitting the measured XYZ tristimulus values ​​of the standard display panel sample at each grayscale binding point under a preset standard color system and when fitting the measured XYZ tristimulus values ​​of the display panel under test at each grayscale binding point under a preset standard color system, the same type of fitting method is used.

[0011] In some embodiments of this application, the preset conditions also include adjusting the grayscale binding point brightness according to the gamma 2.2 standard.

[0012] In some embodiments of this application, an automatic calibration parameter table for the display panel under test is obtained based on the XYZ tristimulus compensation values ​​of the display panel under test in a preset standard colorimetric system at full grayscale, including: Using the automatic color correction table data of the standard display panel sample as a white balance reference target, grayscale white balance calculations are performed on the XYZ tristimulus compensation values ​​of the display panel under test in a preset standard colorimetric system across the entire grayscale, resulting in the automatic correction parameter table of the display panel under test; or Based on the preset white point color coordinate requirements of the standard display panel sample, the XYZ tristimulus compensation values ​​of the display panel under test in the preset standard color system under full grayscale are automatically and adaptively calculated using an automatic color correction table to obtain the automatic correction parameter table of the display panel under test.

[0013] In some embodiments of this application, the measured values ​​of the XYZ tristimulus of the display panel under test under preset conditions and at each grayscale binding point in a preset standard colorimetric system are obtained by extracting the corresponding measured values ​​of each monochrome channel at each grayscale binding point using a color analyzer; or The measured values ​​of the XYZ tristimulus of the display panel under the preset standard colorimetric system at each grayscale binding point under preset conditions are obtained by extracting the measured values ​​of the corresponding four-channel mixed display image at each grayscale binding point using an optical imaging colorimeter.

[0014] A second aspect of this application provides a display panel color compensation device, including a compensation coefficient acquisition module, a tristimulus value curve acquisition module, a coefficient compensation module, and an automatic correction parameter table acquisition module. The compensation coefficient acquisition module is used to acquire the full grayscale compensation coefficient set of the standard display panel sample. The full grayscale compensation coefficient set includes the XYZ tristimulus value compensation coefficients of all color channels of each grayscale in the standard display panel sample. The tristimulus value curve acquisition module is used to acquire the measured values ​​of the XYZ tristimulus of the display panel under test under the preset conditions and at each grayscale binding point in the preset standard color system. Based on the measured values ​​of the XYZ tristimulus of the display panel under test at each grayscale binding point in the preset standard color system, the grayscale binding point tristimulus value curve of the display panel under test is obtained. The grayscale binding point tristimulus value curve includes the XYZ tristimulus fitting values ​​of the display panel under test in the full grayscale preset standard color system. The coefficient compensation module is used to compensate the XYZ tristimulus fitting values ​​in the grayscale bound point tristimulus value curve of the display panel under test based on the full grayscale compensation coefficient set, so as to obtain the XYZ tristimulus compensation values ​​of the display panel under test in the full grayscale preset standard color system. The automatic calibration parameter table acquisition module is used to acquire the automatic calibration parameter table of the display panel under test based on the XYZ tristimulus compensation values ​​of the display panel under test in a preset standard color system under full grayscale, so that the display panel under test can complete the screen display according to the automatic calibration parameter table. The preset conditions include turning off the automatic color correction module.

[0015] A third aspect of this application provides a display panel comprising: at least one processor, a memory, and a computer program stored in the memory and executable on the at least one processor, wherein the processor executes the computer program to implement the method described above.

[0016] Compared with the prior art, one or more embodiments of the above solutions may have the following advantages or beneficial effects: The color compensation method for display panels provided in this invention obtains a set of full grayscale compensation coefficients based on the measured and fitted values ​​of the XYZ tristimulus values ​​under the preset standard chromaticity system of the full grayscale of a standard display panel sample. Then, using this set of full grayscale compensation coefficients, the tristimulus value curve obtained by fitting grayscale binding points to the display panel under test is corrected for full grayscale, resulting in the XYZ tristimulus compensation values ​​under the preset standard chromaticity system. Finally, an automatic calibration parameter table for the display panel under test is generated based on the compensation results. This method effectively improves problems such as poor grayscale color temperature consistency and insufficient gamma linearity in automatic image quality adjustment. By fitting the full grayscale feature distribution based on characteristic grayscale points, it efficiently completes panel gamma and color temperature adjustments while ensuring their linearity, significantly improving display quality consistency and adjustment efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 The diagram shows the display driver for the display panel.

[0019] Figure 2 This is the circuit that generates the grayscale binding point voltage required for gamma correction within the display panel.

[0020] Figure 3 This diagram shows a comparison between an existing standard display panel sample and the display panel under test.

[0021] Figure 4This diagram shows a brightness comparison between an existing standard DI display panel sample and the display panel under test.

[0022] Figure 5 This diagram shows a comparison of the color coordinates of an existing standard display panel sample and the display panel under test.

[0023] Figure 6 The diagram shown is a flowchart illustrating the color compensation method for the display panel described in this application embodiment.

[0024] Figure 7 This table shows a comparison of the measured and fitted values ​​of the XYZ tristimulus values ​​of a standard display panel sample at various grayscale binding points under a preset standard colorimetric system.

[0025] Figure 8 The display shows a curve comparing the measured and fitted values ​​of the XYZ tristimulus of a standard display panel sample at low grayscale.

[0026] Figure 9 The display shows a curve comparing the measured and fitted values ​​of the XYZ tristimulus of a standard display panel sample at mid-to-high gray levels.

[0027] Figure 10 The distribution curve of the fitting correction coefficient in the low grayscale of the color compensation method for the display panel described in the embodiments of this application, used to correct the fitting values ​​of the XYZ tristimulus of a standard display panel sample.

[0028] Figure 11 This is a comparison curve of the difference between the measured value and the fitted value in the full grayscale after correcting the XYZ tristimulus fitting value of a standard display panel sample using the color compensation method of the display panel described in the embodiments of this application.

[0029] Figure 12 The diagram shown is a structural schematic of the display panel color compensation device described in an embodiment of this application.

[0030] Figure 13 The diagram shown is a structural schematic of the display panel described in an embodiment of this application.

[0031] Specific element symbol explanations: 1-Display panel color compensation device, 11-Compensation coefficient acquisition module, 12-Tristimulus value curve acquisition module, 13-Coefficient compensation module, 14-Automatic calibration parameter table acquisition module, 2-Display panel, 20-Processor, 21-Memory, 22-Computer program. Detailed Implementation

[0032] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0033] It should be noted that when a component is referred to as being "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0034] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0035] Currently, mainstream display technologies control the colors of display units via electrical signals. Taking current LCD panels as an example, color imaging is achieved by independently controlling sub-pixels equipped with three primary color photoresists. Existing technology first selects a central wafer for PQ (Picture Quality) calibration, then uses the calibrated data as the raw data, and then automatically matches the grayscale gamma voltage at the panel automatic gamma correction (Auto Panel Gamma) production line station to compensate for differences in the panel gamma curve caused by fluctuations in the manufacturing process. PQ calibration includes gamma voltage calibration, ACC calibration (accurate color capture: grayscale display white balance adjustment), and OD (Over Driving).

[0036] refer to Figure 1As shown, the PQ debugging table for the process center chip is stored in different modules of the Timing Controller Board (TCON Board), the gamma correction data is stored in the Gamma Integrated Circuit (Gamma IC), and the automatic calibration parameter table is stored in the Timing Controller Board. After the LCD panel is powered on, it first checks whether there is valid automatic gamma correction data in the flash memory chip; if so, it overwrites the data in the flash memory chip to the Gamma IC. Subsequently, the Timing Controller Board (TCON IC) analyzes the signal source and controls the driver chip to output voltage according to the gamma correction data and the automatic calibration parameter table to complete the display of the image on the panel.

[0037] Currently, automatic gamma correction adjustment of panels only matches the gamma voltage based on brightness, without simultaneously considering the white balance performance of each grayscale level, thus weakening the color temperature consistency across all grayscale levels to some extent. Existing correction schemes only adjust the gamma-binding voltage around grayscale brightness, failing to consider the inherent differences in the electro-optical transfer functions of the three display units: R Pixel (Red Pixel), G Pixel (Green Pixel), and B Pixel (Blue Pixel), which easily leads to color shift issues. Because the transmittance of LCD panels is strongly correlated with the wavelength of light, the transmittance ratio of R, G, and B monochrome display units relative to white mixed light already deviates under the same driving voltage. Therefore, when the gamma driving voltage is adjusted, the original balance of the RGB three colors is broken, further exacerbating the color shift phenomenon, ultimately resulting in significant color temperature differences at different grayscale levels and poor image display consistency.

[0038] Figure 2The circuit generating the grayscale binding point voltages required for gamma correction within the display panel includes resistors R0-R14, multiple operational amplifiers (OPs), and a driver source chip. V1 to V14 correspond to the gamma output voltages Gamma1-Gamma14, comprising seven sets of positive and negative frame drive voltages for gamma binding points. Gamma1 to Gamma7 correspond to the positive frame drive voltages for grayscale binding points Gray255, Gray254, Gray223, Gray127, Gray31, Gray1, and Gray0, respectively; Gamma8 to Gamma14 correspond to the negative frame drive voltages for the same grayscale binding points. Each set of Gamma voltages is symmetrically distributed relative to the common reference voltage VCOM, and all grayscale drive voltages are adjusted by a voltage divider module in the gamma voltage management chip. Existing display panels typically select 3 to 5 grayscale binding points from Gray31, Gray63, Gray127, Gray191, and Gray223 for automatic polarity gamma adjustment; simultaneously, relying on the fixed voltage output logic of the source driver chip, along with a fixed calibration parameter table, to achieve full-range grayscale voltage adjustment. Due to the insufficient matching degree between the electro-optical transfer function of the voltage divider circuit and the actual electro-optical characteristics of the panel, the gamma linearity of the remaining grayscale levels is generally low, except for the binding points.

[0039] Taking a standard display panel sample and a display panel under test for a certain model as examples, Figures 3-5 This displays comparative diagrams of display quality, brightness, and color coordinates between the standard display panel sample and the display panel under test. Figures 3-5 It can be seen that the standard display panel sample has better PQ performance: the gamma level meets gamma 2.2, the grayscale color coordinate curve has high linearity, and the corresponding grayscale transition screen displays normally. However, the PQ performance of the display panel under test is poor: due to process fluctuations, the cell assembly parameters of the sample differ from those of the standard display panel sample, resulting in the intermediate grayscale gamma level deviating from gamma 2.2, the linearity of the intermediate grayscale in the color coordinate curve is poor, and the intermediate grayscale in the corresponding grayscale transition screen displays yellowish and dark. Therefore, based on the above specific examples, it can also be seen that the existing automatic polar gamma (Auto P-Gamma) scheme only completes gamma curve compensation by adjusting the feature binding point voltage, and can only calibrate the gamma value of the grayscale near the binding point to the Gamma 2.2 standard level; however, this scheme cannot achieve synchronous compensation of the color coordinate curve. Instead, due to the adjustment of the binding point voltage, it will cause an imbalance in the transmittance matching of RGB sub-pixels, which will cause the color coordinate curve to shift and aggravate the color cast problem.

[0040] Based on this, this application improves the color compensation method and apparatus for display panels and the display panel in the related art.

[0041] This application requires a standard display panel sample and a display panel to be tested. The standard display panel sample is a feature optical substrate (feature OC (Open Cell)), which is a standard sample for the image quality calibration process. The display panel to be tested is an experimental sample of the display panel to be debugged.

[0042] The XYZ tristimulus values ​​under the preset standard colorimetric system in the following embodiments are the CIE XYZ tristimulus values ​​(i.e., the International Commission on Illumination XYZ tristimulus values). When the RGB brightness of the display panel is equal to W, the XYZ tristimulus values ​​under the preset standard colorimetric system of the International Commission on Illumination XY in the following embodiments can include the XYZ tristimulus values ​​of the R color channel (i.e., RX, RY, RZ), the XYZ tristimulus values ​​of the G color channel (i.e., GX, GY, GZ), and the XYZ tristimulus values ​​of the B color channel (i.e., BX, BY, BZ). When the RGB brightness is less than W, the XYZ tristimulus values ​​under the preset standard colorimetric system in the following embodiments include, in addition to the XYZ tristimulus values ​​of the R color channel, the G color channel, and the B color channel, the XYZ tristimulus values ​​of the W color channel (i.e., WX, WY, WZ). For ease of explanation, the following embodiments will be illustrated using the example of XYZ tristimulus values ​​under a preset standard colorimetric system that only include the XYZ tristimulus values ​​of the R color channel, the G color channel, and the B color channel.

[0043] In this application, "full grayscale" can refer to the numerical range of 0-255, or other reasonable numerical ranges. This application does not specifically limit the numerical range of full grayscale; and in the following embodiments, only 0-255 is used as an example of full grayscale for illustrative purposes.

[0044] refer to Figure 6 As shown, the color compensation method for a display panel according to an embodiment of this application includes the following steps. The method provided in this embodiment can be executed by a color compensation device, which can be applied to the display panel. For example, the color compensation device can be a timing control chip in the display panel or can be applied to a timing control chip. Of course, the color compensation device can also exist independently of the display panel; for example, it can send the obtained automatic calibration parameter table to the display panel.

[0045] Step S101: Obtain the full grayscale compensation coefficient set of the standard display panel sample. The full grayscale compensation coefficient set includes the XYZ tristimulus value compensation coefficients of all color channels of each grayscale in the standard display panel sample.

[0046] The measured values ​​of XYZ tristimulus of the standard display panel sample under the preset standard chromaticity system with full grayscale are obtained. The measured values ​​of XYZ tristimulus of the standard display panel sample under the preset standard chromaticity system at each grayscale binding point are fitted to obtain the grayscale binding point tristimulus value curve of the standard display panel sample.

[0047] Because the automatic color correction module (ACC) has automatic compensation and color adjustment functions for the display panel, in order to avoid interference from the automatic color correction module with the collected measured data, this embodiment requires turning off the automatic color correction module when collecting the measured values ​​of the XYZ tristimulus under the preset standard chromaticity system of the full grayscale of the standard display panel sample. That is, the preset conditions in this embodiment include at least turning off the automatic color correction module.

[0048] The grayscale bound point tristimulus value curve of the standard display panel sample includes the XYZ tristimulus fitting values ​​under the full grayscale preset standard colorimetric system of the standard display panel sample. Based on the measured and fitted values ​​of the XYZ tristimulus under the full grayscale preset standard colorimetric system of the standard display panel sample, the compensation coefficient of the full grayscale of the standard display panel sample can be obtained.

[0049] Step S102: Obtain the measured XYZ tristimulus values ​​of the display panel under test at each grayscale binding point under a preset standard colorimetric system under preset conditions. Based on the measured XYZ tristimulus values ​​of the display panel under test at each grayscale binding point under the preset standard colorimetric system, obtain the grayscale binding point tristimulus value curve of the display panel under test. The grayscale binding point tristimulus value curve includes the fitted XYZ tristimulus values ​​of the display panel under test at the full grayscale preset standard colorimetric system. Set the display panel under test under preset conditions to collect the measured XYZ tristimulus values ​​of the display panel under test at each grayscale binding point under the same conditions as the standard display panel sample. Then, by fitting the measured XYZ tristimulus values ​​of the display panel under test at each grayscale binding point under the preset standard colorimetric system, the grayscale binding point tristimulus value curve of the display panel under test is obtained.

[0050] Step S103: Based on the full grayscale compensation coefficient set, compensate the XYZ tristimulus fitting values ​​in the grayscale bound point tristimulus value curve of the display panel to be tested under the full grayscale preset standard color system to obtain the XYZ tristimulus compensation values ​​of the display panel to be tested under the full grayscale preset standard color system.

[0051] Step S104: Based on the XYZ tristimulus compensation values ​​of the display panel under test in the preset standard color system under full grayscale, obtain the automatic calibration parameter table of the display panel under test, so that the display panel under test can complete the screen display according to the automatic calibration parameter table.

[0052] By using the full grayscale compensation coefficients from the set of full grayscale compensation coefficients obtained from standard display panel samples, the XYZ tristimulus fitting values ​​under the preset standard colorimetric system in the grayscale bound-point tristimulus value curve of the display panel under test are compensated. This yields the compensated XYZ tristimulus compensation values ​​of the display panel under test in the preset standard colorimetric system across the full grayscale. Finally, grayscale white balance calculations are performed on the XYZ tristimulus compensation values ​​of the display panel under test in the preset standard colorimetric system across the full grayscale to obtain the corresponding automatic calibration parameter table for the display panel under test. This automatic calibration parameter table is stored in the flash memory chip of the display panel under test. When the display panel under test displays an image, it will display a normal grayscale transition.

[0053] This embodiment of the color compensation method for the display panel relies on the adaptive compensation coefficients corresponding to the full grayscale optical characteristic parameters of a standard display panel sample. It performs full grayscale coefficient compensation on the tristimulus value curve obtained by grayscale binding fitting of the display panel under test, and combines it with existing white balance algorithms to achieve adaptive adjustment of the gamma curve and adaptive optimization of grayscale white balance. Compared with traditional solutions, this method can effectively balance the full grayscale white balance while significantly improving grayscale gamma linearity.

[0054] The steps S101 to S104 of the color compensation method for the display panel in this embodiment will be described in detail below.

[0055] Step S101: Obtain the full grayscale compensation coefficient set of the standard display panel sample. The full grayscale compensation coefficient set includes the XYZ tristimulus value compensation coefficients of all color channels of each grayscale in the standard display panel sample.

[0056] When collecting measured XYZ tristimulus values ​​of a standard display panel sample under preset conditions and a full grayscale preset standard colorimetric system, if the preset conditions only include disabling the automatic color correction module, flicker crosstalk or other problems may occur when the display panel under test displays the image based on the corrected automatic correction parameter table. To avoid the above problems, in a specific embodiment of this application, the preset conditions also include adjusting the grayscale binding brightness according to the gamma 2.2 standard.

[0057] The next step involves PQ debugging of the standard display panel sample. The automatic color correction module of the standard display panel sample is disabled. Then, the grayscale binding brightness of the standard display panel sample is adjusted according to the gamma 2.2 standard. After debugging, the measured XYZ tristimulus values ​​of the standard display panel sample under the full grayscale preset standard colorimetric system are acquired using optical instruments. Since the XYZ tristimulus values ​​under the preset standard colorimetric system correspond to multiple color channels, and each color channel independently contains three sets of X, Y, and Z tristimulus values, the X, Y, and Z stimulus values ​​of the standard display panel sample under the full grayscale preset standard colorimetric system in the R color channel, the X, Y, and Z stimulus values ​​under the full grayscale preset standard colorimetric system in the G color channel, and so on, can be obtained. The obtained measured XYZ tristimulus values ​​of the standard display panel sample under the full grayscale preset standard colorimetric system can then be used as a set of input data for the processor executing the color compensation method of the display panel in this embodiment.

[0058] The measured XYZ tristimulus values ​​of the standard display panel sample under the preset standard colorimetric system of the full grayscale are included. The measured XYZ tristimulus values ​​of each grayscale bound point of the standard display panel sample under the preset standard colorimetric system can then be fitted using a curve fitting method to obtain the grayscale bound point tristimulus value curve of the standard display panel sample.

[0059] On the grayscale bound-point tristimulus value curve of a standard display panel sample, the values ​​corresponding to each grayscale level are the XYZ tristimulus fitting values ​​under the preset standard colorimetric system. Since the XYZ tristimulus values ​​under the preset standard colorimetric system correspond to multiple color channels, and each color channel independently contains three sets of tristimulus values ​​(X, Y, and Z), the grayscale bound-point tristimulus value curve of the standard display panel sample actually contains multiple independent grayscale bound-point fitting curves. For example, these include the grayscale bound-point X stimulus value fitting curve corresponding to the R color channel, the grayscale bound-point Y stimulus value fitting curve corresponding to the G color channel, and the grayscale bound-point Z stimulus value fitting curve corresponding to the B color channel, etc. Each grayscale binding point fitting curve includes the corresponding stimulus fitting value under the full grayscale preset standard color system of the corresponding color channel. For example, the grayscale binding point X stimulus value fitting curve corresponding to the R color channel includes the X stimulus fitting value under the full grayscale preset standard color system of the R color channel, the grayscale binding point Y stimulus value fitting curve corresponding to the G color channel includes the Y stimulus fitting value under the full grayscale preset standard color system of the G color channel, and so on.

[0060] After obtaining the measured values ​​of the XYZ tristimulus under the full grayscale preset standard colorimetric system and the fitted values ​​of the XYZ tristimulus under the full grayscale preset standard colorimetric system of the standard display panel sample, the compensation coefficients of the full grayscale can be determined based on the measured values ​​and the fitted values. Finally, the compensation coefficients of the full grayscale are set into a set of full grayscale compensation coefficients.

[0061] In a specific embodiment of this application, the process of obtaining the full grayscale compensation coefficient set can be as follows: For a single color channel at a grayscale level of a standard display panel sample, the measured values ​​of the XYZ tristimulus under the corresponding preset standard colorimetric system are compared with the fitted values ​​of the XYZ tristimulus under the same preset standard colorimetric system in the grayscale bound-point tristimulus value curve to obtain the XYZ tristimulus compensation coefficients for the corresponding color channel at the corresponding grayscale level. For example, for the R color channel at the first grayscale level, the measured values ​​of the X, Y, and Z stimulus under the preset standard colorimetric system for the first grayscale R color channel are obtained from the measured values ​​of the XYZ tristimulus under the preset standard colorimetric system across all grayscale levels of the standard display panel sample; simultaneously, the fitted values ​​of the X, Y, and Z stimulus under the preset standard colorimetric system for the first grayscale R color channel are obtained from the fitted values ​​of the XYZ tristimulus under the same preset standard colorimetric system for the grayscale bound-point tristimulus value curve of the standard display panel sample. The measured value of the X stimulus under the preset standard colorimetric system of the first grayscale R color channel is compared with the fitted value of the X stimulus under the preset standard colorimetric system of the first grayscale R color channel to obtain the X stimulus compensation coefficient of the first grayscale R color channel; the measured value of the Y stimulus under the preset standard colorimetric system of the first grayscale R color channel is compared with the fitted value of the Y stimulus under the preset standard colorimetric system of the first grayscale R color channel to obtain the Y stimulus compensation coefficient of the first grayscale R color channel; and so on, to obtain the XYZ tristimulus compensation coefficients of the first grayscale R color channel.

[0062] Similarly, the XYZ tristimulus compensation coefficients for the first grayscale G color channel and the first grayscale B color channel of the standard display panel sample can be obtained. This yields the XYZ tristimulus compensation coefficients for all color channels in the first grayscale of the standard display panel sample. These XYZ tristimulus compensation coefficients are then set as the compensation coefficient set for the first grayscale. Similarly, the compensation coefficient sets for other grayscales of the standard display panel sample can be obtained. Finally, the compensation coefficient sets for all grayscales of the standard display panel sample are set together to obtain the full grayscale compensation coefficient set of the standard display panel sample.

[0063] By using the set of full grayscale compensation coefficients of the standard display panel sample obtained through this process, the XYZ tristimulus fitting values ​​under the full grayscale preset standard color system of the display panel under test can be compensated.

[0064] Figure 7This table shows the difference between the measured and fitted values ​​of XYZ tristimulus of a certain standard display panel sample at various grayscale binding points under a preset standard colorimetric system. Figure 8 and Figure 9 The figures show the comparison curves of the measured and fitted values ​​of the XYZ tristimulus of a standard display panel sample at low and mid-to-high grayscale levels, respectively. (Reference) Figures 7-9 It can be seen that the full grayscale difference fitting curve in this example has a low fitting degree at low grayscale levels due to the difference in data magnitude, and there is an uneven distribution of different feature parameters. However, the fitting degree is high at medium and high grayscale levels. Therefore, it can be seen that the measured values ​​of stimuli and the fitted values ​​of stimuli under the preset standard color system of the display panel under test may only have large differences in certain grayscale segments or grayscale points. Therefore, in order to reduce the amount of compensation calculation for the fitted values ​​of XYZ tristimulus under the preset standard color system of the full grayscale of the display panel under test, this application can also set up actual numerical compensation for grayscale segments or grayscale points in the display panel under test where the difference between the measured values ​​and fitted values ​​of XYZ tristimulus under the preset standard color system is large. Since the corresponding standard display panel sample and the display panel under test usually have a certain degree of consistency in differences.

[0065] Therefore, in a specific embodiment of this application, the process of obtaining the full grayscale compensation coefficient set can also be as follows: In a standard display panel sample, gray levels that meet a preset difference condition are designated as the first gray level, and gray levels that do not meet the preset difference condition are designated as the second gray level. The preset difference condition is that the difference between the measured XYZ tristimulus values ​​under a preset standard colorimetric system corresponding to the same gray level in the standard display panel sample and the fitted XYZ tristimulus values ​​under the preset standard colorimetric system in the gray-level bound point tristimulus value curve is greater than a preset threshold. For example, it can be set that when the differences between the measured X stimulus values ​​and the fitted X stimulus values, the measured Y stimulus values ​​and the fitted Y stimulus values, and the measured Z stimulus values ​​and the fitted Z stimulus values ​​under the preset standard colorimetric system of the R color channel of the first gray level in the standard display panel sample are all greater than the preset threshold, and the G and B color channels of the first gray level also meet this requirement, then the first gray level can be determined as the first gray level. It should be noted that other methods can also be used to define the first gray level by setting the difference between the measured values ​​and the fitted values ​​to be greater than the preset threshold; this embodiment does not impose a fixed limitation on this.

[0066] For the numerous first gray levels selected using the above method, for any color channel of a first gray level in the standard display panel sample, the measured XYZ tristimulus values ​​under the corresponding preset standard colorimetric system are compared with the fitted XYZ tristimulus values ​​under the corresponding preset standard colorimetric system in the gray-level bound-point tristimulus value curve to obtain the XYZ tristimulus compensation coefficients for the corresponding color channel of the first gray level. This process is the same as the process of obtaining the XYZ tristimulus compensation coefficients for a color channel of a gray level in the previous embodiment, and will not be repeated here. Meanwhile, the XYZ tristimulus compensation coefficients for each color channel of the second gray level in the standard display panel sample are all first values. The first value is set to 1. For example, the X stimulus compensation coefficient for the second gray level R color channel is 1, the stimulus compensation coefficient for the second gray level R color channel is 1, the Z stimulus compensation coefficient for the second gray level R color channel is also 1, and so on.

[0067] The above process yields the XYZ tristimulus compensation coefficients for all color channels at all first gray levels in the standard display panel sample, as well as the XYZ tristimulus compensation coefficients for all color channels at all second gray levels. Based on this, the set of XYZ tristimulus compensation coefficients for all color channels at one gray level of the standard display panel sample can be compiled into a compensation coefficient set for that gray level, and the set of compensation coefficients for all gray levels of the standard display panel sample can be compiled into a full gray level compensation coefficient set.

[0068] Since 1 multiplied by any number equals itself, when using the XYZ tristimulus compensation coefficients corresponding to each color channel of the second grayscale to compensate for the XYZ tristimulus fitting values ​​under the corresponding grayscale preset standard color system of the display panel under test, the original fitting values ​​do not change. Therefore, by combining the XYZ tristimulus compensation coefficients corresponding to each color channel of the first grayscale, the purpose of targeted numerical compensation for the XYZ tristimulus fitting values ​​under the partial grayscale preset standard color system of the display panel under test can be achieved.

[0069] Meanwhile, the set of full grayscale compensation coefficients of the standard display panel sample obtained through this process can also effectively compensate for the XYZ tristimulus fitting values ​​under the full grayscale preset standard color system of the display panel under test.

[0070] Step S102: Obtain the measured values ​​of XYZ tristimulus at each grayscale binding point of the display panel under preset conditions in the preset standard color system. Based on the measured values ​​of XYZ tristimulus at each grayscale binding point of the display panel under preset conditions in the preset standard color system, obtain the grayscale binding point tristimulus value curve of the display panel under test. The grayscale binding point tristimulus value curve includes the XYZ tristimulus fitting values ​​of the full grayscale preset standard color system of the display panel under test.

[0071] Under the same preset conditions as the standard display panel sample, the XYZ tristimulus values ​​of each grayscale bound point in the preset standard colorimetric system are collected. For example, when performing PQ calibration on the display panel under test, the automatic color correction module of the standard display panel sample is turned off, and the grayscale bound point brightness of the display panel under test is calibrated according to the gamma 2.2 standard. After calibration, the XYZ tristimulus values ​​of the full grayscale preset standard colorimetric system of the display panel under test are collected using optical instruments.

[0072] For example, grayscale binding points for the display panel under test can be selected, including Gray0, Gray1, Gray31, Gray63, Gray127, Gray191, Gray223, Gray254, and Gray255. After the display panel under test is calibrated under preset conditions, the measured XYZ tristimulus values ​​of the display panel under test at each grayscale binding point in a preset standard colorimetric system can be collected using optical instruments. It should be noted that the above binding points are only examples, and other grayscale values ​​can also be used as grayscale binding points.

[0073] In a specific embodiment of this application, when acquiring the measured values ​​of the XYZ tristimulus under the preset standard colorimetric system of the full grayscale of the display panel to be tested using optical instruments, the corresponding measured values ​​of each monochrome channel at each grayscale binding point can be extracted by a color analyzer; or the measured values ​​of the corresponding four-channel mixed display image at each grayscale binding point can be extracted by an optical imaging colorimeter.

[0074] It should be noted that when acquiring the measured XYZ tristimulus values ​​of the standard display panel sample under the preset standard colorimetric system with full grayscale using optical instruments, the corresponding measured values ​​of each monochrome channel at each grayscale binding point can also be extracted using a color analyzer; alternatively, the measured values ​​of the corresponding four-channel mixed display image at each grayscale binding point can be extracted using an optical imaging colorimeter. Other optical instruments can also be used to acquire the optical characteristic parameters of the display panel under test and the standard display panel sample; no fixed limitations are imposed here.

[0075] Then, the measured XYZ tristimulus values ​​of each grayscale binding point of the display panel under test can be fitted using the curve fitting method to obtain the grayscale binding point tristimulus value curve of the display panel under test.

[0076] It should be noted that when fitting the measured XYZ tristimulus values ​​under the preset standard colorimetric system at each grayscale binding point of the display panel under test, and when fitting the measured XYZ tristimulus values ​​under the preset standard colorimetric system at each grayscale binding point of the standard display panel sample, if different types of fitting methods are used for curve fitting, deviations may occur when compensating for the fitted XYZ tristimulus values ​​under the preset standard colorimetric system of the full grayscale of the display panel under test based on the full grayscale compensation coefficient set. Therefore, in a specific embodiment of this application, both can be fitted using the same type of fitting method, such as polynomial fitting, exponential fitting, logarithmic fitting, etc. Furthermore, when using polynomial fitting, polynomials of the same order can be set to fit the measured XYZ tristimulus values ​​under the preset standard colorimetric system at each grayscale binding point of the standard display panel sample and the measured XYZ tristimulus values ​​under the preset standard colorimetric system at each grayscale binding point of the display panel under test, respectively.

[0077] Step S103: Based on the full grayscale compensation coefficient set, compensate the XYZ tristimulus fitting values ​​in the grayscale bound point tristimulus value curve of the display panel to be tested under the full grayscale preset standard color system to obtain the XYZ tristimulus compensation values ​​of the display panel to be tested under the full grayscale preset standard color system.

[0078] On the grayscale bound-point tristimulus value curve of the display panel under test, the values ​​corresponding to each grayscale level are the XYZ tristimulus fitting values ​​under the preset standard colorimetric system. For example, the grayscale bound-point X-stimulus value fitting curve corresponding to the R color channel of the display panel under test includes the X-stimulus fitting values ​​under the preset standard colorimetric system for the full grayscale of the R color channel; the grayscale bound-point Y-stimulus value fitting curve corresponding to the G color channel includes the Y-stimulus fitting values ​​under the preset standard colorimetric system for the full grayscale of the G color channel; and the grayscale bound-point Z-stimulus value fitting curve corresponding to the B color channel includes the Z-stimulus fitting values ​​under the preset standard colorimetric system for the full grayscale of the B color channel.

[0079] For a single color channel at a grayscale level of the display panel under test, the XYZ tristimulus fitting value under the preset standard colorimetric system is multiplied by the corresponding XYZ tristimulus compensation coefficient for the corresponding color channel at the same grayscale level in the full grayscale compensation coefficient set. This yields the XYZ tristimulus compensation value for the corresponding color channel at the same grayscale level under the preset standard colorimetric system. For example, multiplying the X stimulus fitting value of the first grayscale R color channel at the preset standard colorimetric system by the X stimulus compensation coefficient for the first grayscale R color channel in the full grayscale compensation coefficient set yields the X stimulus compensation value for the first grayscale R color channel under the preset standard colorimetric system; multiplying the Y stimulus fitting value of the first grayscale G color channel at the preset standard colorimetric system by the Y stimulus compensation coefficient for the first grayscale G color channel in the full grayscale compensation coefficient set yields the Y stimulus compensation value for the first grayscale G color channel under the preset standard colorimetric system; and so on.

[0080] This process allows us to obtain the XYZ tristimulus compensation values ​​of the display panel under test in a preset standard color system at full grayscale.

[0081] Step S104: Based on the XYZ tristimulus compensation values ​​of the display panel under test in the preset standard color system under full grayscale, obtain the automatic calibration parameter table of the display panel under test, so that the display panel under test can complete the screen display according to the automatic calibration parameter table.

[0082] By performing grayscale white balance calculations on the XYZ tristimulus compensation values ​​of the display panel under the preset standard color system in full grayscale, the automatic calibration parameter table (Auto ACC Table) of the display panel under test can be obtained.

[0083] In one specific embodiment of this application, the automatic color correction table data of a standard display panel sample can be used as a white balance reference target. The grayscale white balance calculation is performed on the XYZ tristimulus compensation values ​​of the display panel to be tested under the preset standard color system in full grayscale to obtain the automatic correction parameter table of the display panel to be tested.

[0084] The process for acquiring the automatic color calibration table data for the standard display panel sample is as follows: Specifically, in step S101, after acquiring the measured XYZ tristimulus values ​​of the standard display panel sample under preset conditions and a full grayscale preset standard chromaticity system, grayscale white balance calculation is performed on the measured XYZ tristimulus values ​​of the standard display panel sample under preset conditions and a full grayscale preset standard chromaticity system to obtain the initial automatic color correction parameter table (Initial ACC table) of the standard display panel sample. Then, the initial automatic color correction parameter table is written to the timing control chip. At this time, the automatic color correction module function of the standard display panel sample is activated to realize color self-adjustment. When the brightness curve of the standard display panel sample should meet gamma 2.2, and the grayscale color coordinates should meet the target value (Target), that is, the intermediate grayscale is smaller than the W255 color difference, the values ​​of R255, G255, and B255 of the current automatic color correction parameter table are obtained as automatic color correction parameter table data (ACC Table code).

[0085] In one specific embodiment of this application, the automatic color correction table can also be automatically calculated based on the preset white point color coordinate requirements of the standard display panel sample, and the XYZ tristimulus compensation values ​​of the display panel to be tested under the preset standard color system in full grayscale can be obtained to obtain the automatic correction parameter table of the display panel to be tested.

[0086] It should be noted that the preset white point color coordinates of the standard display panel sample can be set based on the actual product situation, and are not limited here.

[0087] Finally, the Auto Accuracy Table (AACC Table) of the display panel under test is stored in the flash memory IC of the display panel under test. When the display panel under test is powered on, a valid AACC Table is detected in the flash memory IC, and then the AACC Table in the flash memory IC is overwritten and updated to the automatic color correction module of the timing control chip (TCON IC). The timing control chip analyzes the image source signal and drives the source driver chip (S-IC) to output the corresponding voltage based on the initial P-Gamma parameter and the AACC Table data, driving the panel to complete the image display. At this time, the brightness curve of the display panel under test must conform to the gamma 2.2 specification, and the color difference performance of each grayscale color coordinate must be consistent with the reference sample.

[0088] Figure 10 The distribution curve of the fitting correction coefficient in the low grayscale of the color compensation method for the display panel described in the embodiments of this application, used to correct the fitting values ​​of the XYZ tristimulus of a standard display panel sample; Figure 11This is a comparison curve showing the difference between the measured and fitted values ​​across the entire grayscale after correcting the XYZ tristimulus fitting values ​​of a standard display panel sample using the color compensation method described in this application. (Reference) Figure 10 and Figure 11 It can be seen that after applying the color compensation method of the display panel in the embodiment of this application to perform color compensation on the corresponding display panel to be tested, the difference between the measured value and the fitted value of the XYZ tristimulus under the full grayscale preset standard color system of the display panel to be tested can be effectively reduced.

[0089] This embodiment's color compensation method for the display panel effectively solves the defects such as weak grayscale color temperature consistency and poor gamma linearity in automatic panel image quality adjustment. By fitting the global grayscale feature distribution through feature grayscale points, it efficiently completes the synchronous adjustment of color temperature and gamma, ensuring the linear performance of both parameters. Simultaneously, relying on the adaptive compensation coefficient of standard panel optical parameters, combined with existing white balance algorithms, it achieves dual adaptive optimization of gamma curve and grayscale white balance. Compared with traditional adjustment schemes, this scheme can take into account the full grayscale white balance effect, significantly improve grayscale gamma linearity, comprehensively improve the uniformity of display image quality, simplify the adjustment process, and effectively improve the overall efficiency of production line image quality adjustment.

[0090] In order to better implement the color compensation method of the display panel in any of the above embodiments, based on the above color compensation method of the display panel, this application embodiment also provides a color compensation device for the display panel.

[0091] refer to Figure 12 As shown, the display panel color compensation device includes a compensation coefficient acquisition module, a tristimulus value curve acquisition module, a coefficient compensation module, and an automatic correction parameter table acquisition module.

[0092] The compensation coefficient acquisition module is used to acquire the full grayscale compensation coefficient set of the standard display panel sample. The full grayscale compensation coefficient set includes the XYZ tristimulus value compensation coefficients of all color channels of each grayscale in the standard display panel sample. The tristimulus value curve acquisition module is used to acquire the measured values ​​of the XYZ tristimulus of the display panel under test under preset conditions and at each grayscale binding point in the preset standard color system. Based on the measured values ​​of the XYZ tristimulus of the display panel under test at each grayscale binding point in the preset standard color system, the grayscale binding point tristimulus value curve of the display panel under test is obtained. The grayscale binding point tristimulus value curve includes the XYZ tristimulus fitting values ​​of the display panel under test under the full grayscale preset standard color system. The coefficient compensation module is used to compensate the XYZ tristimulus fitting values ​​under the preset standard color system of the grayscale bound point tristimulus value curve of the display panel under test based on the full grayscale compensation coefficient set, so as to obtain the XYZ tristimulus compensation values ​​of the display panel under test under the preset standard color system of the full grayscale. The automatic calibration parameter table acquisition module is used to acquire the automatic calibration parameter table of the display panel under test based on the XYZ tristimulus compensation values ​​of the preset standard color system under full grayscale, so that the display panel under test can complete the screen display according to the automatic calibration parameter table. Among the preset conditions is turning off the automatic color correction module.

[0093] Furthermore, the compensation coefficient acquisition module 11 is specifically used for: The set of full grayscale compensation coefficients for obtaining the standard display panel sample includes: Obtain the measured XYZ tristimulus values ​​of the standard display panel sample under a preset standard chromaticity system with full grayscale under preset conditions, and fit the measured XYZ tristimulus values ​​of the standard display panel sample at each grayscale binding point under the preset standard chromaticity system to obtain the grayscale binding point tristimulus value curve of the standard display panel sample. Based on the measured values ​​of the XYZ tristimulus and the grayscale bound point tristimulus value curves under the full grayscale preset standard color system of the standard display panel sample, a set of full grayscale compensation coefficients is obtained.

[0094] Furthermore, the compensation coefficient acquisition module 11 is also specifically used for: Based on the measured XYZ tristimulus values ​​and grayscale bound-point tristimulus value curves under the full grayscale preset standard colorimetric system of the standard display panel sample, a set of full grayscale compensation coefficients is obtained, including: For a color channel of a gray level of the standard display panel sample, the measured values ​​of the XYZ tristimulus under the corresponding preset standard color system and the fitted values ​​of the XYZ tristimulus under the corresponding preset standard color system in the gray level bound point tristimulus value curve are respectively calculated by ratio to obtain the XYZ tristimulus compensation coefficient of the corresponding color channel of the corresponding gray level. The set of XYZ tristimulus compensation coefficients for all color channels of a gray level of the standard display panel sample is the compensation coefficient group for the corresponding gray level, and the set of compensation coefficient groups for all gray levels of the standard display panel sample is the full gray level compensation coefficient set.

[0095] Furthermore, the compensation coefficient acquisition module 11 is also specifically used for: Based on the measured XYZ tristimulus values ​​and grayscale bound-point tristimulus value curves under the full grayscale preset standard colorimetric system of the standard display panel sample, a set of full grayscale compensation coefficients is obtained, including: The grayscale that meets the preset difference condition in the standard display panel sample is taken as the first grayscale, and the grayscale that does not meet the preset difference condition is taken as the second grayscale. The preset difference condition is that the difference between the measured value of the XYZ tristimulus under the preset standard color system corresponding to the same grayscale in the standard display panel sample and the fitted value of the XYZ tristimulus under the preset standard color system in the grayscale bound point tristimulus value curve is greater than a preset threshold. For a color channel of the first grayscale in the standard display panel sample, the measured values ​​of the XYZ tristimulus under the corresponding preset standard colorimetric system and the fitted values ​​of the XYZ tristimulus under the corresponding preset standard colorimetric system in the grayscale bound point tristimulus value curve are respectively calculated by ratio to obtain the XYZ tristimulus compensation coefficient of the color channel corresponding to the first grayscale; the XYZ tristimulus compensation coefficients corresponding to each color channel of the second grayscale in the standard display panel sample are all set to the first value. The set of XYZ tristimulus compensation coefficients for all color channels of a gray level of the standard display panel sample is the compensation coefficient group for the corresponding gray level, and the set of compensation coefficient groups for all gray levels of the standard display panel sample is the full gray level compensation coefficient set.

[0096] Furthermore, the coefficient compensation module 13 is specifically used for: Based on the set of full grayscale compensation coefficients, the XYZ tristimulus fitting values ​​under the full grayscale preset standard color system in the grayscale bound-point tristimulus value curve of the display panel under test are compensated to obtain the XYZ tristimulus compensation values ​​of the display panel under test under the preset standard color system in full grayscale, including: For a color channel of a gray level of the display panel under test, the XYZ tristimulus fitting value under the preset standard color system is multiplied by the XYZ tristimulus compensation coefficient of the corresponding color channel of the corresponding gray level in the full gray level compensation coefficient set, respectively, to obtain the XYZ tristimulus compensation value of the corresponding color channel of the gray level of the display panel under test under the preset standard color system.

[0097] Furthermore, the coefficient compensation module 13 is also specifically used for: When fitting the measured XYZ tristimulus values ​​of the standard display panel sample at each grayscale binding point under the preset standard color system, and when fitting the measured XYZ tristimulus values ​​of the display panel under test at each grayscale binding point under the preset standard color system, the same type of fitting method is used.

[0098] Furthermore, the tristimulus value curve acquisition module 12 is also specifically used for: The preset conditions also include adjusting the grayscale binding point brightness according to the gamma 2.2 standard.

[0099] Furthermore, the automatic calibration parameter table acquisition module 14 is also specifically used for: The automatic calibration parameter table of the display panel under test is obtained based on the XYZ tristimulus compensation values ​​of the display panel under test in a preset standard colorimetric system at full grayscale, including: Using the automatic color correction table data of the standard display panel sample as a white balance reference target, grayscale white balance calculations are performed on the XYZ tristimulus compensation values ​​of the display panel under test in a preset standard colorimetric system across the entire grayscale, resulting in the automatic correction parameter table of the display panel under test; or Based on the preset white point color coordinate requirements of the standard display panel sample, the XYZ tristimulus compensation values ​​of the display panel under test in the preset standard color system under full grayscale are automatically and adaptively calculated using an automatic color correction table to obtain the automatic correction parameter table of the display panel under test.

[0100] Furthermore, the tristimulus value curve acquisition module 12 is also specifically used for: The measured values ​​of the XYZ tristimulus of the display panel under test under the preset conditions and at each grayscale binding point in the preset standard colorimetric system are obtained by extracting the corresponding measured values ​​of each monochrome channel at each grayscale binding point using a color analyzer; or The measured values ​​of the XYZ tristimulus of the display panel under the preset conditions and the preset standard colorimetric system of each gray level binding point are obtained by extracting the measured values ​​of the corresponding four-channel mixed display image at each gray level binding point using an optical imaging colorimeter.

[0101] This application embodiment also provides a display panel 2, such as Figure 13 As shown, the display panel 2 includes: at least one processor 20, a memory 21, and a computer program 22 stored in the memory 21 and executable on at least one processor 20. When the processor 20 executes the computer program, it implements the steps in any of the above method embodiments, or when the processor 20 executes the computer program, it implements the functions of each module / unit in the above device embodiments.

[0102] This application embodiment also provides a display device, including the above-described display panel 2.

[0103] For example, a computer program can be divided into one or more modules / units, one or more of which are stored in memory and executed by a processor to complete this application. One or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program on display panel 2.

[0104] Those skilled in the art will understand that Figure 5This is merely an example of display panel 2 and does not constitute a limitation on display panel 2. It may include more or fewer components than shown, or combine certain components, or different components. For example, display panel 2 may also include input / output devices, network access devices, buses, etc.

[0105] The aforementioned processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), or field-programmable gate arrays (FPGAs). Programmable Gate Array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0106] The memory can be an internal storage unit of the display panel 2, such as a hard drive or RAM of the display panel 2. The memory can also be an external storage device of the display panel 2, such as a plug-in hard drive, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the display panel 2. Furthermore, the memory can include both internal storage units and external storage devices of the display panel 2.

[0107] This application also provides a readable storage medium storing a computer program, which, when executed by a processor, implements the steps described in the above-described method embodiments.

[0108] This application provides a computer program product that, when run on a display panel 2, enables a mobile terminal to execute the steps described in the above-described method embodiments.

[0109] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of this application can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. A computer-readable medium can include at least: any entity or device capable of carrying computer program code to a photographing device / terminal device, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Examples include USB flash drives, portable hard drives, magnetic disks, or optical disks. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electrical carrier signals or telecommunication signals.

[0110] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0111] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0112] In the embodiments provided in this application, it should be understood that the disclosed apparatus / device and method can be implemented in other ways. For example, the apparatus / device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0113] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0114] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, 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. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A color compensation method for a display panel, characterized in that, include: Obtain the full grayscale compensation coefficient set of the standard display panel sample, wherein the full grayscale compensation coefficient set includes the XYZ tristimulus value compensation coefficients of all color channels of each grayscale in the standard display panel sample. Obtain the measured values ​​of the XYZ tristimulus at each grayscale binding point of the display panel under preset conditions in a preset standard color system. Based on the measured values ​​of the XYZ tristimulus at each grayscale binding point of the display panel under preset conditions in a preset standard color system, obtain the grayscale binding point tristimulus value curve of the display panel under test. The grayscale binding point tristimulus value curve includes the XYZ tristimulus fitting values ​​of the full grayscale preset standard color system of the display panel under test. Based on the set of full grayscale compensation coefficients, the XYZ tristimulus fitting values ​​under the full grayscale preset standard color system in the grayscale bound point tristimulus value curve of the display panel under test are compensated to obtain the XYZ tristimulus compensation values ​​of the display panel under test under the preset standard color system in full grayscale. Based on the XYZ tristimulus compensation values ​​of the display panel under test in the preset standard color system under full grayscale, the automatic correction parameter table of the display panel under test is obtained so that the display panel under test can complete the screen display according to the automatic correction parameter table. The preset conditions include turning off the automatic color correction module.

2. The color compensation method for a display panel according to claim 1, characterized in that, The set of full grayscale compensation coefficients for obtaining the standard display panel sample includes: Obtain the measured XYZ tristimulus values ​​of the standard display panel sample under a preset standard chromaticity system with full grayscale under preset conditions, and fit the measured XYZ tristimulus values ​​of the standard display panel sample at each grayscale binding point under the preset standard chromaticity system to obtain the grayscale binding point tristimulus value curve of the standard display panel sample. Based on the measured values ​​of the XYZ tristimulus and the grayscale bound point tristimulus value curves under the full grayscale preset standard color system of the standard display panel sample, a set of full grayscale compensation coefficients is obtained.

3. The color compensation method for a display panel according to claim 2, characterized in that, Based on the measured XYZ tristimulus values ​​and grayscale bound-point tristimulus value curves under the full grayscale preset standard colorimetric system of the standard display panel sample, a set of full grayscale compensation coefficients is obtained, including: For a color channel of a gray level of the standard display panel sample, the measured values ​​of the XYZ tristimulus under the corresponding preset standard color system and the fitted values ​​of the XYZ tristimulus under the corresponding preset standard color system in the gray level bound point tristimulus value curve are respectively calculated by ratio to obtain the XYZ tristimulus compensation coefficient of the corresponding color channel of the corresponding gray level. The set of XYZ tristimulus compensation coefficients for all color channels of a gray level of the standard display panel sample is the compensation coefficient group for the corresponding gray level, and the set of compensation coefficient groups for all gray levels of the standard display panel sample is the full gray level compensation coefficient set.

4. The color compensation method for a display panel according to claim 2, characterized in that, Based on the measured XYZ tristimulus values ​​and grayscale bound-point tristimulus value curves under the full grayscale preset standard colorimetric system of the standard display panel sample, a set of full grayscale compensation coefficients is obtained, including: The grayscale that meets the preset difference condition in the standard display panel sample is taken as the first grayscale, and the grayscale that does not meet the preset difference condition is taken as the second grayscale. The preset difference condition is that the difference between the measured value of the XYZ tristimulus under the preset standard color system corresponding to the same grayscale in the standard display panel sample and the fitted value of the XYZ tristimulus under the preset standard color system in the grayscale bound point tristimulus value curve is greater than a preset threshold. For a color channel of the first grayscale in the standard display panel sample, the measured values ​​of the XYZ tristimulus under the corresponding preset standard colorimetric system and the fitted values ​​of the XYZ tristimulus under the corresponding preset standard colorimetric system in the grayscale bound point tristimulus value curve are respectively calculated by ratio to obtain the XYZ tristimulus compensation coefficient of the color channel corresponding to the first grayscale; the XYZ tristimulus compensation coefficients corresponding to each color channel of the second grayscale in the standard display panel sample are all set to the first value. The set of XYZ tristimulus compensation coefficients for all color channels of a gray level of the standard display panel sample is the compensation coefficient group for the corresponding gray level, and the set of compensation coefficient groups for all gray levels of the standard display panel sample is the full gray level compensation coefficient set.

5. The color compensation method for a display panel according to claim 3 or 4, characterized in that, Based on the set of full grayscale compensation coefficients, the XYZ tristimulus fitting values ​​under the full grayscale preset standard color system in the grayscale bound-point tristimulus value curve of the display panel under test are compensated to obtain the XYZ tristimulus compensation values ​​of the display panel under test under the preset standard color system in full grayscale, including: For a color channel of a gray level of the display panel under test, the XYZ tristimulus fitting value under the preset standard color system is multiplied by the XYZ tristimulus compensation coefficient of the corresponding color channel of the corresponding gray level in the full gray level compensation coefficient set, respectively, to obtain the XYZ tristimulus compensation value of the corresponding color channel of the gray level of the display panel under test under the preset standard color system.

6. The color compensation method for a display panel according to any one of claims 1-4, characterized in that, When fitting the measured XYZ tristimulus values ​​of the standard display panel sample at each grayscale binding point under the preset standard color system, and when fitting the measured XYZ tristimulus values ​​of the display panel under test at each grayscale binding point under the preset standard color system, the same type of fitting method is used.

7. The color compensation method for a display panel according to any one of claims 1-4, characterized in that, The preset conditions also include adjusting the grayscale binding point brightness according to the gamma 2.2 standard.

8. The color compensation method for a display panel according to any one of claims 1-4, characterized in that, The automatic calibration parameter table of the display panel under test is obtained based on the XYZ tristimulus compensation values ​​of the display panel under test in a preset standard colorimetric system at full grayscale, including: Using the automatic color correction table data of the standard display panel sample as a white balance reference target, grayscale white balance calculations are performed on the XYZ tristimulus compensation values ​​of the display panel under test in a preset standard colorimetric system across the entire grayscale, resulting in the automatic correction parameter table of the display panel under test; or Based on the preset white point color coordinate requirements of the standard display panel sample, the XYZ tristimulus compensation values ​​of the display panel under test in the preset standard color system under full grayscale are automatically and adaptively calculated using an automatic color correction table to obtain the automatic correction parameter table of the display panel under test.

9. The color compensation method for a display panel according to any one of claims 1-4, characterized in that, The measured values ​​of the XYZ tristimulus of the display panel under test, under preset conditions and at each grayscale binding point in a preset standard colorimetric system, are obtained by extracting the corresponding measured values ​​of each monochrome channel at each grayscale binding point using a color analyzer; or The measured values ​​of the XYZ tristimulus of the display panel under the preset standard colorimetric system at each grayscale binding point under preset conditions are obtained by extracting the measured values ​​of the corresponding four-channel mixed display image at each grayscale binding point using an optical imaging colorimeter.

10. A display panel color compensation device, characterized in that, It includes a compensation coefficient acquisition module, a tristimulus value curve acquisition module, a coefficient compensation module, and an automatic correction parameter table acquisition module; The compensation coefficient acquisition module is used to acquire the full grayscale compensation coefficient set of the standard display panel sample. The full grayscale compensation coefficient set includes the XYZ tristimulus value compensation coefficients of all color channels of each grayscale in the standard display panel sample. The tristimulus value curve acquisition module is used to acquire the measured values ​​of the XYZ tristimulus of the display panel under test under preset conditions and at each grayscale binding point in the preset standard color system. Based on the measured values ​​of the XYZ tristimulus of the display panel under test at each grayscale binding point in the preset standard color system, the grayscale binding point tristimulus value curve of the display panel under test is obtained. The grayscale binding point tristimulus value curve includes the XYZ tristimulus fitting values ​​of the display panel under test under the full grayscale preset standard color system. The coefficient compensation module is used to compensate the XYZ tristimulus fitting values ​​in the grayscale bound point tristimulus value curve of the display panel under test based on the full grayscale compensation coefficient set, so as to obtain the XYZ tristimulus compensation values ​​of the display panel under test in the full grayscale preset standard color system. The automatic calibration parameter table acquisition module is used to acquire the automatic calibration parameter table of the display panel under test based on the XYZ tristimulus compensation values ​​of the display panel under test in a preset standard color system under full grayscale, so that the display panel under test can complete the screen display according to the automatic calibration parameter table. The preset conditions include turning off the automatic color correction module.

11. A display panel, characterized in that, include: At least one processor, a memory, and a computer program stored in the memory and executable on at least one processor, wherein the processor, when executing the computer program, implements the method as claimed in any one of claims 1 to 9.

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