CN117524143A - Compensation method and system of display panel, display device and storage medium - Google Patents
Compensation method and system of display panel, display device and storage medium Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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Abstract
The application provides a compensation method, a compensation system, a display device and a storage medium of a display panel, wherein the method comprises the following steps: acquiring original brightness data and initial compensation data corresponding to a preset gray-scale picture displayed by a display panel with maximum gray-scale brightness; calculating to obtain a corresponding central point brightness adjustment proportion according to the original brightness data and the initial compensation data; calculating to obtain corresponding target brightness according to the brightness adjustment proportion of the central point and the initial compensation data; and compensating and displaying the sub-pixels in the display panel according to the target brightness. The compensation precision is improved, and the image quality of the display panel is improved.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a compensation method and system for a display panel, a display device, and a storage medium.
Background
At present, the manufacturing procedures are numerous and complex, and each manufacturing procedure is likely to cause uneven Mura (spots or moire) display due to improper operation, and common Mura can be divided into line, block and plane Mura, so that the display effect of the display panel is affected.
Therefore, it is highly desirable to compensate for gray scale at uneven brightness of the display panel to eliminate Mura phenomenon.
Disclosure of Invention
In view of the foregoing, the present application provides a compensation method, system, display device and storage medium for a display panel, so as to improve compensation accuracy and improve image quality of the display panel.
In a first aspect, the present application provides a compensation method for a display panel, including:
acquiring original brightness data and initial compensation data corresponding to a preset gray-scale picture displayed by a display panel with maximum gray-scale brightness;
calculating to obtain a corresponding central point brightness adjustment proportion according to the original brightness data and the initial compensation data;
calculating to obtain corresponding target brightness according to the brightness adjustment proportion of the central point and the initial compensation data;
and compensating and displaying the sub-pixels in the display panel according to the target brightness.
In an optional embodiment of the present application, the calculating, according to the original brightness data and the initial compensation data, a corresponding central lighting brightness adjustment ratio includes:
inputting the original brightness data into a pooling layer for average downsampling to obtain processed brightness data; the size of the original brightness data is I.J, the size of the processed brightness data is X.Y, both I, J, X and Y are positive integers larger than 1, I is an integer multiple of X, and J is an integer multiple of Y;
acquiring a center brightness value and a minimum brightness value from the processed brightness data;
and dividing the minimum brightness value by the central brightness value to obtain the central point brightness adjustment proportion.
In an optional embodiment of the present application, the initial compensation data includes a center point compensation gray level of a center pixel point and a residual compensation gray level other than the center pixel point, and calculating, according to the center point brightness adjustment ratio and the initial compensation data, a corresponding target brightness includes:
the product calculation is carried out on the processed brightness data and the brightness adjustment proportion of the central point to obtain the maximum gray scale target brightness;
obtaining residual compensation gray scales except the maximum gray scale value and initial gamma voltages corresponding to the residual compensation gray scales from the initial compensation data;
dividing the residual compensation gray level by a gray level ratio of a maximum gray level value of the display panel;
taking the initial gamma voltage corresponding to the residual compensation gray scale as a power exponent, and performing power operation on the gray scale ratio to obtain a power calculation result;
and carrying out product calculation on the power calculation result and the maximum gray scale target brightness to obtain the target brightness corresponding to the residual compensation gray scale.
In an optional embodiment of the present application, after performing compensation display on the sub-pixels in the display panel according to the target brightness, the method includes:
and if the compensation effect does not meet the preset threshold, adjusting the brightness adjustment proportion of the central point until the brightness uniformity of the display panel meets the preset threshold.
In an optional embodiment of the present application, if the compensation effect does not meet the preset threshold, adjusting the central lighting brightness adjustment ratio includes:
and if the overcompensation is determined according to the compensation effect, reducing the brightness adjustment proportion of the central point.
In an optional embodiment of the present application, if the compensation effect does not meet the preset threshold, adjusting the central lighting brightness adjustment ratio includes:
and if the under compensation is determined according to the compensation effect, the brightness adjustment proportion of the central point is increased.
In an optional embodiment of the present application, the acquiring the raw luminance data includes:
acquiring a target image shot when the display panel displays the preset gray-scale picture with the maximum gray-scale brightness, wherein the target image comprises the display panel;
and acquiring original brightness data corresponding to all the pixel points respectively according to the target image.
In a second aspect, the present application also provides a compensation system for a display panel, including:
the acquisition module is used for acquiring original brightness data and initial compensation data corresponding to a preset gray-scale picture displayed by the display panel with maximum gray-scale brightness;
the proportion calculation module is used for calculating and obtaining a corresponding central point brightness adjustment proportion according to the original brightness data and the initial compensation data;
the brightness acquisition module is used for calculating and obtaining corresponding target brightness according to the central point brightness adjustment proportion and the initial compensation data;
and the processing module is used for carrying out compensation display on the sub-pixels in the display panel according to the target brightness.
In a third aspect, the present application further provides a display device, the display device including a display panel, a memory, the memory storing a computer program, and a processor for running the computer program in the memory to perform the steps in the compensation method for the display panel according to the first aspect.
In a fourth aspect, the present application further provides a storage medium storing a plurality of instructions adapted to be loaded by a processor to perform the steps in the method for compensating a display panel according to the first aspect.
According to the compensation method, the system, the display device and the storage medium of the display panel, the original brightness data and the initial compensation data corresponding to the preset gray-scale picture are displayed by the display panel with the maximum gray-scale brightness, the corresponding central-point brightness adjustment proportion is calculated according to the original brightness data and the initial compensation data, the corresponding target brightness is calculated according to the central-point brightness adjustment proportion and the initial compensation data, the sub-pixels in the display panel are subjected to compensation display according to the target brightness, the compensation precision can be improved, and the image quality of the display panel is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a compensation method of a display panel according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a compensation system according to an embodiment of the present application.
Fig. 3 is a diagram illustrating an exemplary compensation method of a display panel according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "one end," "the other end," and the like are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description of the present application and to simplify the description, rather than to indicate or imply that the apparatus or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "" "is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the term "connected" shall be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically connected, can be connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The liquid crystal display device includes: the liquid crystal display comprises a liquid crystal display panel and a driving circuit, wherein the liquid crystal display panel comprises a plurality of scanning lines and a plurality of data lines, and two adjacent scanning lines and two adjacent data lines are crossed to form a pixel unit. For each pixel cell, its light emission luminance may be defined by a "gray scale". The gray scale refers to dividing the brightness of the pixel unit from brightest to darkest into several levels, and each gray scale represents one brightness level. In general, each pixel unit in a display panel has a total of 256 gray levels from 0 gray level to 255 gray levels.
In an OLED display screen, due to the complexity of the OLED process and the difficulty in achieving very good flatness in the vapor deposition process, the luminance of each sub-pixel has a large difference under the same external conditions, and can be perceived by human eyes, i.e., mura phenomenon. Therefore, in order to make the display screen display uniformly and stably, each sub-pixel needs to be compensated to reach the panel display standard. At present, the display screen compensation mode mainly comprises internal compensation and external compensation, wherein the external compensation can be divided into an optical extraction type and an electrical extraction type according to different extraction methods of brightness data. The optical extraction mode is to display a picture under gray scale by a display panel shot by a camera, obtain gray scale compensation data according to the brightness difference of the display picture, compensate the gray scale data to be displayed by the gray scale compensation data after the time sequence controller (TCON IC) is powered on, and then output the compensated gray scale data for picture display, thereby improving the brightness uniformity of the display panel. However, in actual production, the display panel and the backlight are often integrated into a display module to be produced, so that the display module is supplied to the terminal integration of the display device such as the subsequent display and television, and therefore, the luminance uniformity of the display device is affected not only by the display panel, but also by the backlight. When there is a bright/dark spot (single pixel) on the display panel, or when there is dust/dirt on the surface of the backlight module BLU providing brightness (phenomenon is the same as that of the dark spot on the LCD panel), the brightness uniformity of the low gray level is improved, although the DeMura algorithm can be used for adaptively adjusting the brightness of the area of the display panel to compensate the brightness uniformity of the whole display module, when the display panel is at the maximum gray level, the display module brightness non-uniformity caused by the dirt of the backlight cannot be compensated by using the DeMura algorithm, because the display panel is at the maximum gray level, the brightness of the dirt area cannot be adjusted by increasing the gray level, so that the brightness uniformity of the display module cannot be improved, and the picture display effect of the display panel will be greatly reduced.
The application provides a compensation method and system of a display panel, a display device and a storage medium. The display panel in the embodiment of the application can be used for mobile phones, tablet computers, desktop computers, laptop computers, electronic readers, handheld computers, electronic display screens, notebook computers, ultra-mobile Personal Computer (UMPC), netbooks, cellular phones, personal digital assistants (Personal Digital Assistant, PDA), augmented Reality (Augmented Reality, AR) \virtual Reality (VR) devices, media players, wearable devices, digital cameras, car navigation devices, and the like.
The display panel may be a liquid crystal display panel. The present application is not limited to the type of liquid crystal display panel. The liquid crystal display panel provided by the application can be a horizontal electric field type liquid crystal display panel, such as a Fringe FieldSwitching, FFS (Fringe) or In-Plane Switching (IPS) type liquid crystal display panel, or a vertical electric field type liquid crystal display panel, such as a Twisted Nematic (TN) type liquid crystal display panel, or a Multi-domain vertical alignment (Multi-domain Vertical Alignment, MVA) type liquid crystal display panel.
The compensation method, system, display device and storage medium of the display panel of the present application are described below with reference to the drawings of the specification to solve the above problems.
Referring to fig. 1, a flowchart of a compensation method for a display panel according to an embodiment of the present application is shown, where, as shown in fig. 1, the compensation method for a display panel includes the steps of:
s100, obtaining original brightness data and initial compensation data corresponding to a preset gray-scale picture displayed by the display panel with maximum gray-scale brightness.
Specifically, the display panel includes a plurality of pixel units P arranged in an array, and each pixel unit P includes a plurality of sub-pixels (e.g., red sub-pixel R, green sub-pixel G, and blue sub-pixel B). The execution main body of the compensation method of the display panel can be terminal equipment, a processor of the display device, and the compensation system of the display panel can be integrally arranged in the terminal equipment or in the processor of the display device. And taking a picture of the display panel displaying the preset gray-scale picture by adopting the imaging component, and taking the picture to obtain an image when the display panel displays the preset gray-scale picture with the maximum gray-scale brightness to obtain a target image comprising the display panel. After the compensation system acquires the target image, corresponding original brightness data and initial compensation data can be obtained through calculation.
In an optional embodiment of the present application, the acquiring the raw luminance data includes:
s110, acquiring a target image shot when the display panel displays the preset gray-scale picture with the maximum gray-scale brightness, wherein the target image comprises the display panel;
specifically, each display panel has a set display bit number, and different display bit numbers correspond to different gray scales, for example, the display bit number includes 8 bits, 10 bits, 12 bits or even larger, wherein the gray scale maximum value corresponding to 8 bits is 255, the gray scale maximum value corresponding to 10 bits is 1020, and the gray scale maximum value corresponding to 12 bits is 4080.
S120, acquiring original brightness data corresponding to all pixel points according to the target image.
Specifically, the imaging component may be a photographing device such as a camera, a video camera, and the like. The shortest distance from the optical center of the lens of the imaging component to the display panel is smaller than the normal working distance of the imaging component. In this embodiment, the normal working distance of the imaging assembly is the working distance of the imaging assembly when the area in the display panel photographed by the imaging assembly does not have image distortion or when the image distortion is at a minimum.
The compensation system can acquire a target image from the imaging component, and after the compensation system acquires the target image, the original brightness data corresponding to all pixel points are extracted from the target image, wherein brightness refers to brightness of the image, and for a gray level image, the brightness value of the image is an image gray level value, the value range of the gray level value is 0-255, and the gray level value and the brightness value are in a proportional relation, namely, the higher the gray level value is, the brighter the image is. Therefore, gray scale processing can be performed on the target image to obtain gray scale values of all pixel points in the target image, so that corresponding original brightness data can be obtained.
Of course, the process of obtaining the original brightness data may also be extracting three primary color components of the target image, where each pixel has three components, and the three primary color components represent gray values of red, blue and green of the color of the pixel, and calculating the brightness of the pixel according to the three primary color components, that is, calculating and obtaining the original brightness data corresponding to the pixel according to the gray values of red, blue and green converted by the pixel, where the formula is as follows:
L＝a1*R+a2*G+a3*B
wherein R represents a gray value of red, G represents a gray value of green, B represents a gray value of blue, and a1, a2 and a3 are constant coefficients, respectively.
Preferably, the imaging component is not located right in front of the display panel, so that the brightness of different areas of the target image may deviate to generate distortion, and therefore, after the compensation system acquires the target image, image preprocessing is performed on the target image, wherein the image preprocessing includes viewing angle correction, brightness correction and the like, and then the compensation system extracts original brightness data corresponding to all pixel points from the target image after the image preprocessing, so that the problem that the compensation effect is affected due to the image brightness distortion of the display panel can be solved.
And S200, calculating to obtain a corresponding central point brightness adjustment proportion according to the original brightness data and the initial compensation data.
In an optional embodiment of the present application, the calculating, according to the original brightness data and the initial compensation data, a corresponding central lighting brightness adjustment ratio includes:
s210, inputting the original brightness data into a pooling layer for average downsampling to obtain processed brightness data; the size of the original brightness data is I.J, the size of the processed brightness data is X.Y, both I, J, X and Y are positive integers larger than 1, I is an integer multiple of X, and J is an integer multiple of Y;
specifically, pooling is also called Pooling, which is essentially sampling, pooling compresses an input picture by selecting a certain mode, and the Pooling type comprises a maximum Pooling layer or a mean Pooling layer, wherein the maximum Pooling layer scans the input data according to a Pooling kernel with the size of X and Y to select the maximum value for outputting. The average value pooling layer scans the pooled kernel of the input data according to the X-Y size and outputs the average value of the area corresponding to the pooled kernel. According to the method, the original brightness data is reduced by using the average value pooling layer, namely, the original brightness data with the size of I.J is input into the average value pooling layer for average value downsampling to obtain the processed brightness data with the size of X.Y, so that the original brightness data corresponding to the Mura region can be reserved, and the influence of data noise and data quantity on algorithm compensation precision and time can be reduced while the original brightness data corresponding to dust or dirt regions in the display region of the display panel in the target image is reserved.
After the processed brightness data with the size of x×y is obtained through the averaging layer, the processed brightness data with the size of x×y can be segmented according to the size of h×w to obtain corresponding sub-blocks, H and W are both odd numbers greater than 1, and H and W are both smaller than X and Y.
For example, assuming that the target image includes 1920×1080 pixels, performing downsampling on 1920×1080 pixels, performing blocking by 4*4 to obtain corresponding sub-blocks, detecting sub-blocks of all pixel blocks corresponding to the whole display panel in the target image, so that the average value obtained by performing average processing on the gray scale values of all the pixel points in the region through downsampling can reduce the influence of noise points, and performing compensation based on the average value of the whole region, namely the average brightness, so that the compensation of a single noise point can be reduced.
S220, acquiring a center brightness value and a minimum brightness value from the processed brightness data;
and S230, dividing the minimum brightness value by the central brightness value to obtain the central point brightness adjustment ratio.
Specifically, since h×w is an odd number, each sub-block is centrosymmetric, and a central luminance value Lc can be screened or found from the processed luminance data included in each sub-block, where the central luminance value is the processed luminance data corresponding to the central pixel point of the sub-block. Similarly, the size comparison and screening can be performed on the processed luminance data included in the sub-block to find out the minimum luminance value Lmin, where the minimum luminance value is the minimum value of all the processed luminance data in the sub-block. In some embodiments, H may be equal to M, W may be equal to N, although H may not be equal to M, W may not be equal to N.
Thus, since the processed luminance data is obtained from the original luminance data extracted from the target image captured when the display panel displays the preset gray-scale screen at the maximum gray-scale luminance Lmax (e.g., 255), the center-lighting luminance adjustment ratio is a ratio corresponding to the maximum gray-scale luminance Lmax, and the obtained minimum luminance value is divided by the center luminance valueThe central point brightness adjustment Ratio Lmax =lmin/Lc. The present application is exemplified by the maximum gray-scale luminance of 255 for a display panel, and if the number of display bits supported by the display panel is 10 bits, the maximum gray-scale luminance of the display panel is 1020.
S300, calculating to obtain corresponding target brightness according to the central point brightness adjustment proportion and the initial compensation data.
Specifically, the compensation system calculates the central brightness adjustment ratio through the above embodiment, and obtains the initial compensation data according to the target image, and then calculates the corresponding target brightness through steps S310 to S350 in the following embodiment.
In an optional embodiment of the present application, the initial compensation data includes a center point compensation gray level of a center pixel point and a residual compensation gray level other than the center pixel point, and calculating, according to the center point brightness adjustment ratio and the initial compensation data, a corresponding target brightness includes:
s310, carrying out product calculation on the processed brightness data and the brightness adjustment proportion of the central point to obtain the maximum gray scale target brightness;
specifically, the original luminance data corresponding to the target image is reduced to obtain processed luminance data, and then any processed luminance data with a size of x×y is multiplied by the luminance adjustment ratio of the center point calculated in the above embodiment to obtain the corresponding maximum gray-scale target luminance, that is, the calculation formula of the maximum gray-scale target luminance is as follows:
Ltarget max ＝L Craw ×Ratio max ＝L Craw ×(Lmin/Lc) (1)
wherein Lmin is a sub-block Q k Lc is a sub-block Q k Ratio of the minimum luminance value of (1) max Is a sub-block Q k Center point brightness adjustment ratio, L Craw Is a sub-block Q k Is the processed luminance data of (1), ltarget max Is a sub-block Q k Is a maximum gray scale target luminance of (1).
Exemplary, ifIllustrated with a maximum gray scale luminance of 255 for the display panel, then Ratio max Equal to Ratio 255 ，Ltarget max Equal to Ltarget 255 。
S320, obtaining residual compensation gray scales except the maximum gray scale value and initial gamma voltages corresponding to the residual compensation gray scales from the initial compensation data;
specifically, the display device stores initial power supply voltages AVDD corresponding to different preset gray levels in advance, and the timing controller TCON calls the initial power supply voltages AVDD corresponding to the preset gray levels from the storage area, and inputs the initial power supply voltages AVDD to the digital power management integrated circuit PMIC, and the digital power management integrated circuit PMIC determines the corresponding initial gamma voltages. According to the method, the initial gamma voltage corresponding to the maximum gray level value is input to the display panel, so that all the sub-pixels in the display panel display the preset gray level picture by the initial gamma voltage corresponding to the maximum gray level value, namely the display panel displays the preset gray level picture by the maximum gray level value. In general, the initial compensation data may include a plurality of binding point gray scales including 0 gray scale, 48 gray scale, 96 gray scale, 127 gray scale (or 128 gray scale), 255 gray scale, wherein 255 gray scale is a maximum gray scale value, and thus, the remaining compensation gray scales other than the maximum gray scale value may be obtained from the initial compensation data, and the remaining compensation gray scales are gray scales other than the maximum gray scale value in the binding point. In this way, since the display device stores the initial power supply voltages AVDD corresponding to different preset gray scales in advance, the initial gamma voltages corresponding to different residual compensation gray scales can be obtained through the above process.
The plurality of binding point gray scales described above are only examples, and the plurality of binding point gray scales may further include 0 gray scale, 16 gray scale, 32 gray scale, 64 gray scale, 128 gray scale, 192 gray scale, 224 gray scale, and 255 gray scale. The present application is exemplified by the maximum gray-scale value of 255 for the display panel, and if the number of display bits supported by the display panel is 10 bits, the maximum gray-scale value of 1020 for the display panel.
S330, dividing the residual compensation gray level by a gray level ratio of the maximum gray level value of the display panel;
specifically, the Gray scale ratio Gray can be calculated by substituting the residual compensation Gray scale and the maximum Gray scale value of the display panel into the following formula A /Gray B Wherein Gray A Gray is a residual compensation Gray scale B Is the maximum gray scale value of the display panel. For example, when the number of display bits supported by the display panel is 8 bits, the maximum gray-scale value of the display panel is 255. When the number of display bits supported by the display panel is 10 bits, the maximum gray-scale value of the display panel is 1020.
S340, taking the initial gamma voltage corresponding to the residual compensation gray scale as a power exponent, and performing power operation on the gray scale ratio to obtain a power calculation result;
and S350, performing product calculation on the power calculation result and the maximum gray scale target brightness to obtain the target brightness corresponding to the residual compensation gray scale.
Specifically, the gray scale ratio and the initial gamma voltage corresponding to the current residual compensation gray scale are substituted as the power exponent into the following formula to calculate to obtain the current residual compensation gray scale and the maximum gray scale value of the display panel is substituted into the following formula (2) to calculate to obtain the target brightness corresponding to the current residual compensation gray scale.
Wherein Lmin is a sub-block Q k Lc is a sub-block Q k Ratio of the minimum luminance value of (1) max Is a sub-block Q k Center point brightness adjustment ratio, L Craw Is a sub-block Q k Is the processed luminance data of (1), ltarget max Is a sub-block Q k Maximum Gray scale target luminance of Gray A Gray for compensating Gray scale for current residual B V is the maximum gray scale value of the display panel GrayB For the initial gamma voltage corresponding to the current residual compensation gray level, ltarget grayA And compensating the target brightness corresponding to the gray level for the current residual.
Similarly, the target brightness corresponding to each of the different residual compensation gray scales can be obtained through calculation through the flow.
And S400, performing compensation display on the sub-pixels in the display panel according to the target brightness.
Specifically, after the processor of the terminal device or the display device calculates the target brightness corresponding to all the residual compensation gray scales according to the above embodiment, the preset driving parameters corresponding to the target brightness may be determined, where the preset driving parameters include a preset gamma voltage, and the target brightness may be positively related to the corresponding preset gamma voltage, so that when the central brightness adjustment ratio is changed, the display panel may keep the initial compensation data unchanged, and compensation display is performed on the sub-pixels in the display panel according to the target brightness. Therefore, the corresponding target brightness is obtained by calculating the same central brightness adjustment proportion, so that the target brightness corresponding to each initial compensation data can be calculated according to the same central brightness adjustment proportion for different initial compensation data, the display brightness of all the sub-pixels of the display panel can be subjected to synchronous equal proportion change, the compensation precision is improved, and the image quality of the display panel is improved.
In an optional embodiment of the present application, after performing compensation display on the sub-pixels in the display panel according to the target brightness, the method includes:
and S500, if the compensation effect does not accord with the preset threshold, adjusting the central lighting brightness adjustment proportion until the brightness uniformity of the display panel meets the preset threshold.
Specifically, the imaging component can be used for shooting the display area in the display panel after compensation display again to obtain a verification image, wherein the verification image comprises the display area in the display panel after compensation display. And then, the compensation system identifies the verification image, judges whether the compensation effect of the display area in the verification image accords with a preset threshold value, and if the compensation effect does not accord with the preset threshold value, adjusts the central lighting adjustment ratio until the brightness uniformity of the display panel meets the preset threshold value. Otherwise, if the compensation flow meets the preset threshold value, ending the compensation flow. Of course, the display panel may be compensated for display at the target gamma voltage corresponding to the target brightness in the above embodiment, and the engineer may visually observe whether the Mura area still exists in the display area of the display panel, and if so, input the command to adjust the central lighting adjustment ratio until the brightness uniformity of the display panel meets the preset threshold.
In an optional embodiment of the present application, if the compensation effect does not meet the preset threshold, adjusting the central lighting brightness adjustment ratio includes:
and if the overcompensation is determined according to the compensation effect, reducing the brightness adjustment proportion of the central point.
Specifically, the display module is subjected to brightness uniformity correction according to the calculated target brightness, and meanwhile, the adjustment coefficient is fed back according to the compensation effect. The verification image can be identified, whether the verification image accords with a preset threshold value is judged, the condition that the verification image accords with the preset threshold value comprises that the display area does not have the Mura area and the display brightness of the display area reaches a preset brightness value, and if the Mura area exists or the display area does not have the Mura area and the display brightness of the display area does not reach the preset brightness value, the central lighting brightness adjustment proportion is adjusted to be high.
In an optional embodiment of the present application, if the compensation effect does not meet the preset threshold, adjusting the central lighting brightness adjustment ratio includes:
and if the under compensation is determined according to the compensation effect, the brightness adjustment proportion of the central point is increased.
Specifically, the display module is subjected to brightness uniformity correction according to the calculated target brightness, and meanwhile, the adjustment coefficient is fed back according to the compensation effect. The verification image can be identified, whether the verification image accords with a preset threshold value is judged, the condition that the verification image accords with the preset threshold value comprises that the display area does not have the Mura area and the display brightness of the display area reaches a preset brightness value, and if the Mura area exists or the display area does not have the Mura area and the display brightness of the display area exceeds the preset brightness value, the central lighting brightness adjustment proportion is adjusted down.
According to the method and the device, feedback compensation is carried out on the display panel according to the compensation effect, so that target gamma voltages corresponding to target brightness of sub-pixels in each area in the display panel are adjusted, brightness of the Mura area is adjusted to be equivalent to that of the adjacent area, brightness of each area of the display panel is relatively uniform, the purposes of reducing or eliminating Mura are achieved, and yield and display picture quality can be effectively improved.
Exemplary, as shown in FIG. 3, 255 Gray-scale white_demura compensation mode is entered to obtain initial compensation data to obtain compensation Gray-scale Gray based on the initial compensation data A Initial gamma voltage V corresponding to each compensation gray level GrayA . The method comprises the steps of obtaining original brightness data with the maximum gray-scale brightness, such as 255 gray-scales, inputting the original brightness data with the 255 gray-scales into a mean value pooling layer (setting a default step length of the pooling layer to be 4*4, corresponding to the specification of a conventional Demura IP, setting the value according to the noise of the original data and the specification of the specified Demura IP), wherein the mean value pooling layer is used for carrying out mean value filtering on the original brightness data with the noise and downsampling, reducing the influence of data noise and data quantity on the algorithm compensation precision and time, and outputting the processed brightness data with the 255 gray-scales after the data passes through the mean value pooling layer. Extracting a center luminance value L of the processed luminance data C And minimum brightness value L min According to L C And L is equal to min The central brightness adjustment Ratio can be calculated 255 ＝L min /L C . Will Ratio 255 The target brightness ratio coefficient value (which can be adjusted according to the compensation effect) is set as the default to calculate the maximum gray scale value, such as the maximum gray scale target brightness at 255 gray scalesThen according toCalculating the target brightness of any residual compensation gray scale:
wherein GrayA is any one of the residuesCompensating gray scale, V GrayA And (5) compensating the initial gamma voltage corresponding to the gray level GrayA for the rest. Correcting the brightness uniformity of the display module according to the calculated target brightness corresponding to all the residual compensation gray scales, and simultaneously feeding back according to the compensation effect to adjust Ratio 255 Coefficients. According to the method, the mura generated at 255 gray scales of the module caused by the backlight dirt can be adaptively corrected, and meanwhile, the compensation coefficient can be actively adjusted according to the actual compensation effect, so that feedback adjustment is realized, the compensation precision is improved, the module image quality is improved, and the production cost is reduced.
According to the embodiment corresponding to the compensation method of the display panel, the embodiment of the application further provides a compensation system of the display panel, including:
the acquisition module is used for acquiring original brightness data and initial compensation data corresponding to a preset gray-scale picture displayed by the display panel with maximum gray-scale brightness;
the proportion calculation module is used for calculating and obtaining a corresponding central point brightness adjustment proportion according to the original brightness data and the initial compensation data;
the brightness acquisition module is used for calculating and obtaining corresponding target brightness according to the central point brightness adjustment proportion and the initial compensation data;
and the processing module is used for carrying out compensation display on the sub-pixels in the display panel according to the target brightness.
In the embodiments of the present application, the device embodiments corresponding to the compensation method of the display panel are referred to for the part of the compensation flow of the embodiments of the present application, and the description of the embodiments of the compensation method of the display panel is omitted herein.
According to an embodiment of the compensation method of a display panel, the display device further includes a display panel, a memory, and a processor, where the memory stores a computer program, and the processor is configured to run the computer program in the memory to execute the steps in the compensation method of the display panel.
The memory is an internal storage unit of the display device, such as a hard disk or a memory of the display device; alternatively, the memory is an external storage device of the display apparatus, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card) or the like provided on the display apparatus. Further, the memory may include both an internal storage unit and an external storage device of the display apparatus. The memory is used for storing application software and various types of data installed in the display device, or for temporarily storing data that has been output or is to be output. The memory has stored thereon computer executable instructions executable by the processor to perform the steps of the method of compensating a display panel of the present application.
According to the embodiment corresponding to the compensation method of the display panel, the embodiment of the application further provides a storage medium, wherein the storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor to execute the steps in the compensation method of the display panel.
Wherein the storage medium may comprise nonvolatile and/or volatile memory, which may include Read Only Memory (ROM), programmable memory (PROM), electrically programmable memory (EPROM), electrically erasable programmable memory (EEPROM), flash memory, or the like; volatile memory can include Random Access Memory (RAM) or external cache memory, and the like. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
It should be noted that the storage medium stores one or more computer programs, and the one or more computer programs are loaded by one or more processors to execute the steps in any of the display panel compensation methods provided in the embodiments of the present application.
The steps in the compensation method of any display panel provided in the embodiments of the present application may be executed by the computer program stored in the storage medium, so that the beneficial effects that can be achieved by the compensation method of any display panel provided in the embodiments of the present application may be achieved, which are detailed in the previous embodiments and are not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The foregoing describes in detail a compensation method, system, display device and storage medium for a display panel provided in the embodiments of the present application, and specific examples are applied to illustrate the principles and embodiments of the present application, where the foregoing description of the embodiments is only used to help understand the method and core idea of the present application; meanwhile, those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, and the present description should not be construed as limiting the present application in view of the above. Moreover, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the principles of the present application, and such modifications and variations are considered to be within the scope of the present application.
Claims (10)
1. A compensation method for a display panel, comprising:
acquiring original brightness data and initial compensation data corresponding to a preset gray-scale picture displayed by a display panel with maximum gray-scale brightness;
calculating to obtain a corresponding central point brightness adjustment proportion according to the original brightness data and the initial compensation data;
calculating to obtain corresponding target brightness according to the brightness adjustment proportion of the central point and the initial compensation data;
and compensating and displaying the sub-pixels in the display panel according to the target brightness.
2. The method of compensating a display panel according to claim 1, wherein calculating a corresponding center-point luminance adjustment ratio according to the original luminance data and the initial compensation data comprises:
inputting the original brightness data into a pooling layer for average downsampling to obtain processed brightness data; the size of the original brightness data is I.J, the size of the processed brightness data is X.Y, both I, J, X and Y are positive integers larger than 1, I is an integer multiple of X, and J is an integer multiple of Y;
acquiring a center brightness value and a minimum brightness value from the processed brightness data;
and dividing the minimum brightness value by the central brightness value to obtain the central point brightness adjustment proportion.
3. The method of compensating a display panel according to claim 2, wherein the initial compensation data includes a center point compensation gray level of a center pixel point and a remaining compensation gray level other than the center pixel point, and the calculating the corresponding target brightness according to the center point brightness adjustment ratio and the initial compensation data includes:
the product calculation is carried out on the processed brightness data and the brightness adjustment proportion of the central point to obtain the maximum gray scale target brightness;
obtaining residual compensation gray scales except the maximum gray scale value and initial gamma voltages corresponding to the residual compensation gray scales from the initial compensation data;
dividing the residual compensation gray level by a gray level ratio of a maximum gray level value of the display panel;
taking the initial gamma voltage corresponding to the residual compensation gray scale as a power exponent, and performing power operation on the gray scale ratio to obtain a power calculation result;
and carrying out product calculation on the power calculation result and the maximum gray scale target brightness to obtain the target brightness corresponding to the residual compensation gray scale.
4. The method for compensating a display panel according to claim 1, wherein the compensating the sub-pixels in the display panel according to the target brightness comprises:
and if the compensation effect does not meet the preset threshold, adjusting the brightness adjustment proportion of the central point until the brightness uniformity of the display panel meets the preset threshold.
5. The method of claim 4, wherein adjusting the center-lighting adjustment ratio if the compensation effect does not meet a predetermined threshold comprises:
and if the overcompensation is determined according to the compensation effect, reducing the brightness adjustment proportion of the central point.
6. The method of claim 4, wherein adjusting the center-lighting adjustment ratio if the compensation effect does not meet a predetermined threshold comprises:
and if the under compensation is determined according to the compensation effect, the brightness adjustment proportion of the central point is increased.
7. The method of compensating a display panel according to any of claims 1 to 6, wherein the acquiring the original luminance data includes:
acquiring a target image shot when the display panel displays the preset gray-scale picture with the maximum gray-scale brightness, wherein the target image comprises the display panel;
and acquiring original brightness data corresponding to all the pixel points respectively according to the target image.
8. A compensation system for a display panel, comprising:
the acquisition module is used for acquiring original brightness data and initial compensation data corresponding to a preset gray-scale picture displayed by the display panel with maximum gray-scale brightness;
the proportion calculation module is used for calculating and obtaining a corresponding central point brightness adjustment proportion according to the original brightness data and the initial compensation data;
the brightness acquisition module is used for calculating and obtaining corresponding target brightness according to the central point brightness adjustment proportion and the initial compensation data;
and the processing module is used for carrying out compensation display on the sub-pixels in the display panel according to the target brightness.
9. A display device comprising a display panel, a memory storing a computer program and a processor for running the computer program in the memory to perform the steps in the method of compensating the display panel according to any of claims 1 to 7.
10. A storage medium storing a plurality of instructions adapted to be loaded by a processor to perform the steps of the method of compensating a display panel of any of claims 1 to 7.
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