WO2022205521A1 - 显示面板的灰阶补偿方法、灰阶补偿装置及灰阶补偿系统 - Google Patents

显示面板的灰阶补偿方法、灰阶补偿装置及灰阶补偿系统 Download PDF

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WO2022205521A1
WO2022205521A1 PCT/CN2021/087853 CN2021087853W WO2022205521A1 WO 2022205521 A1 WO2022205521 A1 WO 2022205521A1 CN 2021087853 W CN2021087853 W CN 2021087853W WO 2022205521 A1 WO2022205521 A1 WO 2022205521A1
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Prior art keywords
grayscale
pixel
display
compensation
gamma
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PCT/CN2021/087853
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English (en)
French (fr)
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张裕桦
王文礼
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Tcl华星光电技术有限公司
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Priority to JP2021521830A priority Critical patent/JP7405845B2/ja
Priority to US17/287,541 priority patent/US20240013696A1/en
Publication of WO2022205521A1 publication Critical patent/WO2022205521A1/zh

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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
    • G09G3/2007—Display of intermediate tones
    • 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
    • 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
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • 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
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0686—Adjustment of display parameters with two or more screen areas displaying information with different brightness or colours
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0693—Calibration of display systems
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present application relates to the field of display technology, and in particular, to a grayscale compensation method, a grayscale compensation device and a grayscale compensation system for a display panel.
  • the center brightness and gamma (gamma) of the Panel are usually used as the target values.
  • the center point shown in Figure 1 its The gamma curve used is gamma23, the gamma value corresponding to the grayscale of a certain binding point is 2.218, and the grayscale compensation of the display panel is calculated.
  • the grayscale compensation of other positions is fitted according to the grayscale difference from the center.
  • the gamma curves used are gamma11-gamma35 respectively. Under the same grayscale of the binding point, different gamma curves correspond to different gamma values. Therefore, If the gray level difference compensation is performed based on the brightness and gamma of the center point, the single gray level compensation accuracy is too low.
  • the present application provides a grayscale compensation method, a grayscale compensation device, and a grayscale compensation system for a display panel, so as to alleviate the technical problem of low precision when the display panel performs grayscale compensation at a time.
  • the present application provides a grayscale compensation method for a display panel, which includes: acquiring at least one set of image data corresponding to a grayscale of a binding point of the display panel; and dividing the display panel into a main display area and at least a display panel according to the image data a display sub-area, and obtaining the gamma average value of each display sub-area; and determining the gray-scale compensation value corresponding to the bound gray-scale of any pixel in the display sub-area based on the gamma average value of the display sub-area.
  • the step of acquiring at least one set of image data corresponding to the grayscales of the binding points of the display panel includes: determining a plurality of grayscales of the binding points of the display panel; and obtaining a set of grayscales based on each grayscale of the binding points Image data, the image data includes pixel data of each pixel; the pixel brightness and pixel coordinates of the pixel data are determined.
  • the steps of dividing the display panel into a main display area and at least one display sub-area, and obtaining the gamma average value of each display sub-area include: determining the difference between pixels in the image data. a first brightness difference threshold; based on the first brightness difference threshold and pixel coordinates, the display panel is divided into a main display area and at least one display sub-area.
  • the steps of dividing the display panel into a main display area and at least one display sub-area, and obtaining the gamma average value of each display sub-area further includes: Bind the grayscale and pixel brightness, and fit the brightness-grayscale relationship curve; determine the gamma value of each pixel according to the brightness-grayscale relationship curve; calculate the gamma value of the display sub-area based on the gamma value and pixel coordinates of each pixel Horse average.
  • the step of determining the grayscale compensation value corresponding to the bound grayscale of any pixel in the display subregion based on the gamma average value of the display subregion includes: according to the gamma value of each pixel in the display subregion The gamma value of the display sub-area is obtained from the horse value; the first actual grayscale corresponding to the pixel brightness of any pixel is determined based on the brightness-grayscale relationship curve and the gamma average value; based on the brightness-grayscale relationship curve, the first actual grayscale is determined; The target grayscale is the second actual grayscale corresponding to the binding point grayscale of a pixel in the display main area; the grayscale compensation value is determined according to the difference between the second actual grayscale and the first actual grayscale.
  • the step of determining the first actual gray level corresponding to the pixel brightness of any pixel based on the brightness-grayscale relationship curve and the gamma average value includes: determining the display where the pixel is located according to the pixel coordinates of the pixel. Sub-area; determine that the gamma average value of the display sub-area is the gamma average value of the pixel; based on the luminance-grayscale relationship curve and the pixel's gamma average value, obtain the first actual grayscale of any pixel.
  • the step further includes: based on the at least one display subregion The gray level compensation value corresponding to the gray level of the binding point of any pixel is obtained, and the gray level compensation table corresponding to the gray level of the binding point is obtained; the gray level compensation table is programmed to the display panel.
  • the step further includes: acquiring image data corresponding to the grayscale compensation table; evaluating the grayscale compensation effect of the display panel; if the grayscale compensation effect meets the expected compensation If the difference between the pixel brightness of any pixel in the display sub-area and the pixel brightness of a pixel in the display main area is less than or equal to the second brightness difference threshold; if the gray-scale compensation effect is not If the expected compensation effect is met, the grayscale compensation method of at least one of the above embodiments is repeated.
  • the present application provides a grayscale compensation device, which includes an acquisition module, a processing module, and a determination module; the acquisition module is used to acquire at least one set of image data corresponding to the grayscale of the binding point of the display panel; the processing module is used for According to the image data, the display panel is divided into a main display area and at least one display sub-area, and the gamma average value of each display sub-area is obtained; the determining module is used to determine any of the display sub-areas based on the gamma average value of the display sub-area The grayscale compensation value corresponding to the grayscale of the binding point of one pixel.
  • the present application provides a grayscale compensation system, which includes a display panel, the grayscale compensation device in any of the above embodiments, and a burning device; the grayscale compensation device is used to determine a grayscale compensation value of the display panel; The programming device is connected with the display panel and the grayscale compensation device, and is used for programming the grayscale compensation value to the display panel.
  • the grayscale compensation method, the grayscale compensation device and the grayscale compensation system of the display panel provided by the present application can divide the display panel into the display main area and the display sub-areas by using image data, and can be based on the gamma average of each display sub-area.
  • the value determines the grayscale compensation value of the corresponding pixel in the display sub-area, which can improve the single grayscale compensation accuracy of the pixel in the display panel.
  • FIG. 1 is a schematic structural diagram of a partition and a gamma distribution of a display panel.
  • FIG. 2 is a schematic flowchart of a grayscale compensation method provided by an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of a grayscale compensation apparatus provided by an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a grayscale compensation system provided by an embodiment of the present application.
  • FIG. 5 is a schematic flowchart of gray scale compensation provided by an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a luminance-grayscale relationship curve provided by an embodiment of the present application.
  • this embodiment provides a grayscale compensation method for a display panel, which includes the following steps:
  • Step S10 Acquire at least one set of image data corresponding to the grayscales of the binding points of the display panel.
  • Step S20 According to the image data, the display panel is divided into a main display area and at least one display sub-area, and the gamma average value of each display sub-area is obtained.
  • step S30 based on the gamma average value of the display sub-area, determine a gray-scale compensation value corresponding to the bound gray-scale of any pixel in the display sub-area.
  • the display panel is divided into the display main area and the display sub-area by image data, and the display sub-areas can be determined based on the gamma average value of each display sub-area.
  • the gray-scale compensation value of the corresponding pixel in the area can improve the single-time gray-scale compensation accuracy of the pixel in the display panel.
  • the display panel in this embodiment has one or more grayscales with binding points, and a set of image data can be acquired for each grayscale with binding points.
  • the set of image data is the original image data of an image of the display panel driven by the grayscale of the corresponding binding point, which can be acquired by an image acquisition module, such as a camera, and the original image data can include the Pixel coordinates and pixel brightness.
  • the tie-point grayscale may be, but not limited to, at least one of grayscale L0, grayscale L25, grayscale L48, grayscale L64, grayscale L128, grayscale L225, and grayscale L255. Based on this, the brightness-grayscale relationship curve can be obtained by fitting calculation according to the grayscales of different binding points of the same pixel and the corresponding pixel brightness.
  • the gamma value corresponding to the pixel at the gray level of the binding point can be obtained by the gray level of the binding point and the pixel brightness corresponding to some gray levels of the binding point.
  • each pixel point in the image data can be partitioned according to the difference range between the pixel brightness of each pixel point, wherein, in general, the pixel brightness in the central area is generally higher, in this case, you can
  • Each pixel in the central area is divided into a main display area, and other areas can be divided into at least one display sub-area. It can be understood that the pixel coordinates of each pixel in the image data and the pixel coordinates of each pixel in the display panel can be in a one-to-one correspondence through corresponding coordinate conversion.
  • the gamma average value of the display sub-region can be obtained.
  • each pixel in each display sub-area calculates the gray level compensation value corresponding to the gray level of the respective binding point
  • the gamma average value of the display sub-area where each pixel is located is used instead of the gamma of a pixel in the display main area. value, which can eliminate or reduce the technical problem of low precision in obtaining the corresponding grayscale compensation value based on the gamma value of a pixel in the display main area.
  • the step of acquiring at least one set of image data corresponding to the tie-point grayscales of the display panel includes: determining a plurality of tie-point grayscales of the display panel. Based on the grayscale of each binding point, a set of image data is acquired, and the image data includes pixel data of each pixel. Determines the pixel brightness and pixel coordinates of the pixel data.
  • the image data in this embodiment may be the original image data generated during the process of capturing the picture of the display panel, and then the image acquisition module, such as a camera, generates a corresponding picture according to the original image data.
  • the image acquisition module such as a camera
  • the raw image data it may include the pixel brightness and pixel coordinates of each pixel.
  • the step of dividing the display panel into a main display area and at least one display sub-area, and obtaining the gamma average value of each display sub-area includes: determining the number of pixels between the pixels in the image data.
  • a luminance difference threshold Based on the first luminance difference threshold and pixel coordinates, the display panel is divided into a main display area and at least one display sub-area.
  • each pixel brightness of each pixel can be obtained according to the image data, and each pixel within a certain brightness range and the corresponding pixel coordinates of each pixel can be obtained based on the pixel brightness of each pixel, and then each pixel in the same brightness range can be obtained.
  • the area where it is located is regarded as a display sub-area, and similarly, the areas where other display sub-areas are located can be obtained.
  • the step of dividing the display panel into a main display area and at least one display sub-area, and obtaining the gamma average value of each display sub-area further includes: Point grayscale and pixel brightness, and fit the brightness-grayscale relationship curve.
  • the gamma value of each pixel is determined according to the brightness-grayscale relationship curve. Based on the gamma value of each pixel and the pixel coordinates, the gamma average value of the display sub-region is calculated.
  • the step of determining the gray-scale compensation value corresponding to the tied-point gray-scale of any pixel in the display sub-area includes: according to the gamma value of each pixel in the display sub-area value to get the gamma average of the display sub-area.
  • the first actual grayscale corresponding to the pixel luminance of any pixel is determined.
  • the target grayscale is determined, and the target grayscale is the second actual grayscale corresponding to the binding point grayscale of a pixel in the display main area. According to the difference result between the second actual gray level and the first actual gray level, the gray level compensation value is determined.
  • the grayscale of a pixel in the display main area may be selected as the target grayscale according to the pixel coordinates.
  • the step of determining the first actual gray level corresponding to the pixel brightness of any pixel based on the brightness-grayscale relationship curve and the average gamma value includes: determining the display subunit where the pixel is located according to the pixel coordinates of the pixel. Area. The gamma average value of the display sub-region is determined as the gamma average value of the pixel. The first actual gray level of any pixel is obtained based on the luminance-gray level relationship curve and the gamma average value of the pixel.
  • the step further includes: based on any pixel in the display subregion The gray level compensation value corresponding to the gray level of the binding point of one pixel is obtained, and the gray level compensation table corresponding to the gray level of the binding point is obtained. Write the grayscale compensation table to the display panel.
  • the step further includes: acquiring image data corresponding to the grayscale compensation table. Evaluate the grayscale compensation effect of the display panel. If the gray-scale compensation effect meets the expected compensation effect, the gray-scale compensation method is terminated.
  • the expected compensation effect is that the difference between the pixel brightness of any pixel in the display sub-area and the pixel brightness of a pixel in the display main area is less than or equal to the second brightness difference threshold. If the gray-scale compensation effect does not meet the expected compensation effect, the gray-scale compensation method in at least one of the above embodiments is repeated.
  • this embodiment provides a grayscale compensation device, which includes an acquisition module 10 , a processing module 20 and a determination module 30 ;
  • the acquisition module 10 is used to acquire at least one set of The image data corresponding to the grayscale of the binding point;
  • the processing module 20 is used to divide the display panel into a display main area and at least one display sub-area according to the image data, and obtain the gamma average value of each display sub-area;
  • the determination module 30 is used for Based on the gamma average value of the display sub-region, the gray-scale compensation value corresponding to the gray-scale of any pixel in the display sub-region is determined.
  • the grayscale compensation device divides the display panel into the display main area and the display sub-areas by using image data, and can determine the corresponding display sub-areas based on the gamma average value of each display sub-area.
  • the grayscale compensation value of the pixel can improve the single grayscale compensation accuracy of the pixel in the display panel.
  • this embodiment provides a grayscale compensation system, which includes a display panel 300 , the grayscale compensation device 100 in any of the above-mentioned embodiments, and the burning device 200 ;
  • the compensation device 100 is used for determining the grayscale compensation value of the display panel;
  • the programming device 200 is connected to the display panel 300 and the grayscale compensation device 100 for programming the grayscale compensation value to the display panel 300 .
  • the display panel is divided into the display main area and the display sub-area through image data, and the corresponding display sub-areas can be determined based on the gamma average value of each display sub-area.
  • the grayscale compensation value of the pixel can improve the single grayscale compensation accuracy of the pixel in the display panel.
  • the gray scale compensation process in the above embodiment is as follows:
  • the gray-scale compensation write cycle is set to zero. Then, the original grayscale compensation data in the flash memory (Flash) in the X printed circuit board of the display panel is erased, and the timing controller of the display panel is reset, and then the grayscale compensation write cycle is set to 1.
  • the corresponding image data can be obtained.
  • the image data includes the coordinate value of each pixel point and the luminance value of each pixel point.
  • Preprocessing and partition gamma calculation data processing Determine the image partition according to the brightness value difference between each pixel. For example, if the brightness difference value is within a certain range, it is regarded as a partition, because the grayscale of each pixel point and the corresponding brightness value is known, therefore, according to formula 1 and formula 2 as shown below, the gamma of each pixel at different gray levels of the binding point can be obtained, and then the average gamma of each partition can be obtained by calculating the gamma of each pixel above. Specifically, according to the actual difference of gamma in each area of the display panel, image partitioning is performed on the tie-point grayscales (L25, L48, L64, L128, L225, etc.) to be compensated.
  • tie-point grayscales L25, L48, L64, L128, L225, etc.
  • the Panel can be divided into 3 ⁇ 5 areas , and then fit the brightness-grayscale relationship curve according to the collected grayscale of each binding point and its corresponding brightness value, and calculate the average gamma value of each partition according to formula 2 for each region.
  • Equation 2 After transformation according to Equation 1, Equation 2 can be obtained as follows:
  • Equation 3 After transformation according to Equation 2, Equation 3 can be obtained as follows:
  • X is the corresponding grayscale, which can be the bound grayscale or the grayscale to be calculated
  • Lum(X) is the luminance value corresponding to the grayscale X collected by the camera
  • Lum(255) and Lum(0 ) is the corresponding brightness value after normalization of the grayscale L255 and the grayscale L0 collected by the camera
  • gamma can be a gamma value or an average gamma value.
  • Generate grayscale compensation table Take the central area of the display panel as the value range of the target grayscale, calculate the difference between the pixel brightness of each pixel and the target brightness, and judge the pixel coordinates (i, j) of any pixel.
  • the value is the average gamma(m,n) value of the corresponding area, and then the luminance-grayscale transformation is performed according to formula (3) to obtain the grayscale value corresponding to the corresponding gamma average value.
  • a pixel in the partition according to the brightness-grayscale relationship curve generated by fitting as shown in Figure 6, for a certain grayscale L1, its corresponding brightness G1, and the target brightness of the center point is G2, according to the brightness-grayscale relationship curve and the partition
  • gray level compensation values corresponding to the gray levels of the binding point of different pixels can be obtained, and then a corresponding gray level compensation table can be generated according to the gray level compensation values of different pixels under the gray level of the same binding point.
  • the grayscale compensation table corresponding to the grayscales of other binding points can be obtained.
  • the gray-scale compensation effect of the display panel when the gray-scale compensation effect meets the expected compensation effect, the above-mentioned gray-scale compensation process can be ended; when the gray-scale compensation effect does not meet the expected compensation effect, judge the gray-scale compensation to write Check whether the input cycle is less than 2. If the grayscale compensation write cycle is less than 2, repeat the above compensation process in turn; if the grayscale compensation write cycle is greater than or equal to 2, the above grayscale compensation process can be ended.
  • the above grayscale compensation process can realize compensation based on the gamma of different partitions for brightness-grayscale conversion, which can improve the compensation effect of one-time repair when the differences in each area of the Panel are large, and reduce the extra production caused by multiple iteration repairs. cost.
  • the captured image is preprocessed and divided into m*n partitions (the value of m,n can be increased or decreased according to the actual difference of the Panel), and the gamma mean value of each partition is calculated by fitting.
  • the compensation data of each pixel of the Panel use the gamma of each corresponding area to perform brightness-grayscale conversion to calculate the compensation value. It can solve the problem that a single Demura repair cannot compensate for the best when the gamma and the center point of each area on the entire surface of the Panel are quite different.
  • the number of gray-scale compensations can be reduced, the time cost for performing the gray-scale compensation can be reduced, and the production cost of the display panel can be reduced.

Abstract

一种显示面板的灰阶补偿方法、灰阶补偿装置及灰阶补偿系统；该灰阶补偿方法通过获取至少一组与显示面板(300)的绑点灰阶对应的图像数据，基于图像数据对显示面板（300）进行显示主区和显示子区的划分，可以根据各显示子区自己的伽马平均值确定显示子区中对应像素的灰阶补偿值，能够提高显示面板（300）中像素的单次灰阶补偿精度。

Description

显示面板的灰阶补偿方法、灰阶补偿装置及灰阶补偿系统 技术领域
本申请涉及显示技术领域，具体涉及一种显示面板的灰阶补偿方法、灰阶补偿装置及灰阶补偿系统。
背景技术
显示面板(Panel)在进行亮度均一化(Demura)修复时，为保证产品中心的光学特性，通常采用Panel的中心亮度及伽马(gamma)作为目标值，如图1所示的中心点，其所采用的伽马曲线为gamma23，某一绑点灰阶对应的伽马值为2.218，进行显示面板的灰阶补偿计算，其他位置的灰阶补偿根据与中心的灰阶差值进行拟合，但由于Panel各点的实际gamma存在差异，如图1所示，采用的伽马曲线分别为gamma11-gamma35，在同一绑点灰阶下，不同的伽马曲线对应不同的伽马值，因此，采用以中心点的亮度、gamma为基准进行灰阶差值补偿的话，单次的灰阶补偿精度过低。
技术问题
本申请提供一种显示面板的灰阶补偿方法、灰阶补偿装置及灰阶补偿系统，以缓解显示面板单次进行灰阶补偿时存在的精度过低的技术问题。
技术解决方案
第一方面，本申请提供一种显示面板的灰阶补偿方法，其包括：获取至少一组与显示面板的绑点灰阶对应的图像数据；根据图像数据，划分显示面板为显示主区和至少一个显示子区，及得到各显示子区的伽马平均值；以及基于显示子区的伽马平均值，确定显示子区中任一像素的绑点灰阶对应的灰阶补偿值。
在其中一些实施方式中，获取至少一组与显示面板的绑点灰阶对应的图像数据的步骤，包括：确定显示面板的多个绑点灰阶；基于每个绑点灰阶，获取一组图像数据，图像数据包括各像素的像素数据；确定像素数据的像素亮度和像素坐标。
在其中一些实施方式中，根据图像数据，划分显示面板为显示主区和至少 一个显示子区，及得到各显示子区的伽马平均值的步骤，包括：确定图像数据中各像素之间的第一亮度差异阈值；基于第一亮度差异阈值和像素坐标，划分显示面板为显示主区和至少一个显示子区。
在其中一些实施方式中，根据图像数据，划分显示面板为显示主区和至少一个显示子区，及得到各显示子区的伽马平均值的步骤，还包括：基于同一像素的多组对应的绑点灰阶和像素亮度，拟合亮度-灰阶关系曲线；根据亮度-灰阶关系曲线，确定各像素的伽马值；基于各像素的伽马值和像素坐标，计算显示子区的伽马平均值。
在其中一些实施方式中，基于显示子区的伽马平均值，确定显示子区中任一像素的绑点灰阶对应的灰阶补偿值的步骤，包括：根据显示子区中各像素的伽马值，得到显示子区的伽马平均值；基于亮度-灰阶关系曲线和伽马平均值，确定任一像素的像素亮度对应的第一实际灰阶；基于亮度-灰阶关系曲线，确定目标灰阶，目标灰阶为显示主区中一像素的绑点灰阶对应的第二实际灰阶；根据第二实际灰阶与第一实际灰阶的差值结果，确定灰阶补偿值。
在其中一些实施方式中，基于亮度-灰阶关系曲线和伽马平均值，确定任一像素的像素亮度对应的第一实际灰阶的步骤，包括：根据像素的像素坐标，确定像素所在的显示子区；确定显示子区的伽马平均值为像素的伽马平均值；基于亮度-灰阶关系曲线和像素的伽马平均值，得到任一像素的第一实际灰阶。
在其中一些实施方式中，基于显示子区的伽马平均值，确定显示子区中任一像素的绑点灰阶对应的灰阶补偿值的步骤之后，还包括：基于至少一个显示子区中任一像素的绑点灰阶对应的灰阶补偿值，得到绑点灰阶对应的灰阶补偿表；烧录灰阶补偿表至显示面板。
在其中一些实施方式中，烧录灰阶补偿表至显示面板的步骤之后，还包括：获取灰阶补偿表对应的图像数据；评估显示面板的灰阶补偿效果；若灰阶补偿效果符合预期补偿效果，则结束灰阶补偿方法，预期补偿效果为显示子区中任一像素的像素亮度与显示主区中一像素的像素亮度之差小于或者等于第二亮度差异阈值；若灰阶补偿效果不符合预期补偿效果，则重复上述实施方式中至少一项的灰阶补偿方法。
第二方面，本申请提供一种灰阶补偿装置，其包括获取模块、处理模块以 及确定模块；获取模块用于获取至少一组与显示面板的绑点灰阶对应的图像数据；处理模块用于根据图像数据，划分显示面板为显示主区和至少一个显示子区，及得到各显示子区的伽马平均值；确定模块用于基于显示子区的伽马平均值，确定显示子区中任一像素的绑点灰阶对应的灰阶补偿值。
第三方面，本申请提供一种灰阶补偿系统，其包括显示面板、上述任一实施方式中的灰阶补偿装置以及烧录装置；灰阶补偿装置用于确定显示面板的灰阶补偿值；烧录装置与显示面板和灰阶补偿装置连接，用于烧录灰阶补偿值至显示面板。
有益效果
本申请提供的显示面板的灰阶补偿方法、灰阶补偿装置及灰阶补偿系统，通过图像数据对显示面板进行显示主区和显示子区的划分，可以根据各显示子区自己的伽马平均值确定显示子区中对应像素的灰阶补偿值，能够提高显示面板中像素的单次灰阶补偿精度。
附图说明
图1为显示面板的分区以及伽马分布的结构示意图。
图2为本申请实施例提供的灰阶补偿方法的流程示意图。
图3为本申请实施例提供的灰阶补偿装置的的结构示意图。
图4为本申请实施例提供的灰阶补偿系统的结构示意图。
图5为本申请实施例提供的灰阶补偿的流程示意图。
图6为本申请实施例提供的亮度-灰阶关系曲线的结构示意图。
本发明的实施方式
为使本申请的目的、技术方案及效果更加清楚、明确，以下参照附图并举实施例对本申请进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本申请，并不用于限定本申请。
请参阅图1至图6，如图2所示，本实施例提供了一种显示面板的灰阶补偿方法，其包括以下步骤：
步骤S10：获取至少一组与显示面板的绑点灰阶对应的图像数据.
步骤S20：根据图像数据，划分显示面板为显示主区和至少一个显示子区， 及得到各显示子区的伽马平均值。
以及步骤S30：基于显示子区的伽马平均值，确定显示子区中任一像素的绑点灰阶对应的灰阶补偿值。
可以理解的是，本实施例提供的显示面板的灰阶补偿方法，通过图像数据对显示面板进行显示主区和显示子区的划分，可以基于各显示子区自己的伽马平均值确定显示子区中对应像素的灰阶补偿值，能够提高显示面板中像素的单次灰阶补偿精度。
需要进行说明的是，本实施例中的显示面板具有一个或者多个绑点灰阶，可以针对每个绑点灰阶获取一组图像数据。该一组图像数据为显示面板在对应绑点灰阶驱动下的一幅图像所具有的原始图像数据，可以通过图像获取模块，例如，相机等进行获取，原始图像数据可以包括有各个像素的像素坐标和像素亮度。
其中，像素亮度与像素灰阶具有一一对应的关系，因此，基于不同的像素亮度可以获得对应的像素灰阶。
其中，绑点灰阶可以但不限于为灰阶L0、灰阶L25、灰阶L48、灰阶L64、灰阶L128、灰阶L225以及灰阶L255中的至少一个。基于此，可以根据同一像素的不同绑点灰阶与对应的像素亮度，通过拟合计算获得亮度-灰阶关系曲线。
在此基础上，可以根据对应公式，通过绑点灰阶以及一些绑点灰阶对应的像素亮度得到该像素在该绑点灰阶下对应的伽马值。
因此，可以根据各像素点的像素亮度之间的差异范围，对所述图像数据中的各像素点进行分区，其中，一般情况下，中心区的像素亮度普遍较高，这种情况下，可以将中心区内的各像素划分为显示主区，而其他区域可以划分为至少一个显示子区。可以理解的是，图像数据中各像素的像素坐标与显示面板中各像素的像素坐标可以通过对应的坐标转换实现一一对应关系。
基于各像素的伽马值和显示子区的分布情况，可以确定对应的显示子区都包括哪些像素以及该些像素的伽马值，将同一显示子区中各像素的伽马值叠加之后除以该显示子区中的像素数量，即可得到该显示子区的伽马平均值。
然后每个显示子区中的各像素在计算各自绑点灰阶对应的灰阶补偿值时， 采用各像素所在显示子区的伽马平均值，而非显示主区中一像素点的伽马值，可以消除或者降低基于显示主区中一像素点的伽马值获得对应灰阶补偿值时所存在的精度不高的技术问题。
在其中一个实施例中，获取至少一组与显示面板的绑点灰阶对应的图像数据的步骤包括：确定显示面板的多个绑点灰阶。基于每个绑点灰阶，获取一组图像数据，图像数据包括各像素的像素数据。确定像素数据的像素亮度和像素坐标。
需要进行说明的是，本实施例中的图像数据可以为拍摄显示面板的画面的过程中，生成的原始图像数据，然后图像获取模块，例如，相机等再根据该原始图像数据生成对应的画面。在原始图像数据中，其可以包括各像素的像素亮度和像素坐标。
在其中一个实施例中，根据图像数据，划分显示面板为显示主区和至少一个显示子区，及得到各显示子区的伽马平均值的步骤包括：确定图像数据中各像素之间的第一亮度差异阈值。基于第一亮度差异阈值和像素坐标，划分显示面板为显示主区和至少一个显示子区。
可以理解的是，根据图像数据可以得到各像素的像素亮度，基于各像素的像素亮度可以得到某一亮度范围内各像素，以及对应的各像素的像素坐标，然后将在同一亮度范围内各像素所在的区域作为一个显示子区，同理，可以得到其他显示子区的所在区域。
在其中一个实施例中，根据图像数据，划分显示面板为显示主区和至少一个显示子区，及得到各显示子区的伽马平均值的步骤还包括：基于同一像素的多组对应的绑点灰阶和像素亮度，拟合亮度-灰阶关系曲线。根据亮度-灰阶关系曲线，确定各像素的伽马值。基于各像素的伽马值和像素坐标，计算显示子区的伽马平均值。
在其中一个实施例中，基于显示子区的伽马平均值，确定显示子区中任一像素的绑点灰阶对应的灰阶补偿值的步骤包括：根据显示子区中各像素的伽马值，得到显示子区的伽马平均值。基于亮度-灰阶关系曲线和伽马平均值，确定任一像素的像素亮度对应的第一实际灰阶。基于亮度-灰阶关系曲线，确定目标灰阶，目标灰阶为显示主区中一像素的绑点灰阶对应的第二实际灰阶。根 据第二实际灰阶与第一实际灰阶的差值结果，确定灰阶补偿值。
需要进行说明的是，在图像数据中，可以根据像素坐标选取显示主区中的一像素的灰阶作为目标灰阶。
在其中一个实施例中，基于亮度-灰阶关系曲线和伽马平均值，确定任一像素的像素亮度对应的第一实际灰阶的步骤包括：根据像素的像素坐标，确定像素所在的显示子区。确定显示子区的伽马平均值为像素的伽马平均值。基于亮度-灰阶关系曲线和像素的伽马平均值，得到任一像素的第一实际灰阶。
需要进行说明的是，基于已获取到的每个显示子区中的像素坐标，可以通过像素坐标判断出那些像素属于对应的显示子区的。
在其中一个实施例中，基于显示子区的伽马平均值，确定显示子区中任一像素的绑点灰阶对应的灰阶补偿值的步骤之后还包括：基于至少一个显示子区中任一像素的绑点灰阶对应的灰阶补偿值，得到绑点灰阶对应的灰阶补偿表。烧录灰阶补偿表至显示面板。
在其中一个实施例中，烧录灰阶补偿表至显示面板的步骤之后还包括：获取灰阶补偿表对应的图像数据。评估显示面板的灰阶补偿效果。若灰阶补偿效果符合预期补偿效果，则结束灰阶补偿方法，预期补偿效果为显示子区中任一像素的像素亮度与显示主区中一像素的像素亮度之差小于或者等于第二亮度差异阈值。若灰阶补偿效果不符合预期补偿效果，则重复上述实施例中至少一项的灰阶补偿方法。
如图3所示，在其中一个实施例中，本实施例提供一种灰阶补偿装置，其包括获取模块10、处理模块20以及确定模块30；获取模块10用于获取至少一组与显示面板的绑点灰阶对应的图像数据；处理模块20用于根据图像数据，划分显示面板为显示主区和至少一个显示子区，及得到各显示子区的伽马平均值；确定模块30用于基于显示子区的伽马平均值，确定显示子区中任一像素的绑点灰阶对应的灰阶补偿值。
可以理解的是，本实施例提供的灰阶补偿装置，通过图像数据对显示面板进行显示主区和显示子区的划分，可以基于各显示子区自己的伽马平均值确定显示子区中对应像素的灰阶补偿值，能够提高显示面板中像素的单次灰阶补偿精度。
如图4所示，在其中一个实施例中，本实施例提供一种灰阶补偿系统，其包括显示面板300、上述任一实施例中的灰阶补偿装置100以及烧录装置200；灰阶补偿装置100用于确定显示面板的灰阶补偿值；烧录装置200与显示面板300和灰阶补偿装置100连接，用于烧录灰阶补偿值至显示面板300。
可以理解的是，本实施例提供的灰阶补偿系统，通过图像数据对显示面板进行显示主区和显示子区的划分，可以基于各显示子区自己的伽马平均值确定显示子区中对应像素的灰阶补偿值，能够提高显示面板中像素的单次灰阶补偿精度。
综上所述，如图5所示，上述实施例中的灰阶补偿过程具体如下：
Demura开始的同时，灰阶补偿写入次数cycle置零。然后擦除显示面板的X印制电路板中闪存(Flash)内的原始灰阶补偿数据，并复位显示面板的时序控制器，然后灰阶补偿写入次数cycle置为1。
使用相机拍摄进行取图：根据相机拍摄到的显示面板中不同预设的绑点灰阶对应的具有初始mura的亮度图片的过程中，可以得到对应的图像数据。该图像数据包括各像素点的坐标值和各像素点的亮度值。
预处理以及分区gamma计算数据处理：根据各像素之间的亮度值差异确定图像分区，例如，亮度差异值在一定范围内的作为一个分区，由于各像素点的绑点灰阶和对应的亮度值是已知的，因此，根据如下所示的公式1和公式2，可以获得各像素点在不同绑点灰阶下的gamma，然后根据上述各像素点的gamma计算得到各分区的平均gamma。具体地，根据显示面板各区域gamma实际差异状况对要补偿的绑点灰阶(L25、L48、L64、L128、L225等)进行图像分区，例如图1所示，可以将Panel分为3x5个区域，然后根据采集到的每个绑点灰阶与其对应的亮度值，拟合亮度-灰阶关系曲线，并对每个区域依据公式2计算各分区的平均伽马值。
Figure PCTCN2021087853-appb-000001
根据公式1进行变换后，可以得到如下所示的公式2：
Figure PCTCN2021087853-appb-000002
根据公式2进行变换后，可以得到如下所示的公式3：
Figure PCTCN2021087853-appb-000003
其中，X为对应的灰阶，可以为绑点灰阶，也可以为需要计算的灰阶；Lum(X)为相机采集到的灰阶X对应的亮度值；Lum(255)和Lum(0)为相机采集到的灰阶L255、灰阶L0归一化之后对应的亮度值；gamma可以为伽马值，也可以为平均伽马值。
生成灰阶补偿表(Table)：以显示面板的中心区域作为目标灰阶的取值范围，计算各像素的像素亮度与目标亮度的差值，对任一像素的像素坐标(i,j)判断其所在的分区(m,n)，其中，这些分区可以为阵列分布的，m可以为沿第一方向分布的行数，n可以为沿第二方向分布的列数，选取对应像素的伽马值为对应区域的平均gamma(m,n)值，然后根据公式(3)进行亮度-灰阶变换，求得对应伽马平均值对应的灰阶值，例如图6所示，分区内一像素，根据如图6所示的拟合生成的亮度-灰阶关系曲线，针对某一灰阶L1其对应的亮度G1，而中心点的目标亮度为G2，根据亮度-灰阶关系曲线及该分区的伽马平均值，利用公式(3)可以求得亮度G2对应的灰阶L2，则该像素的绑点灰阶所需的灰阶补偿值为ΔL＝(L2-L1)。基于此，可以得到不同像素的该绑点灰阶对应的灰阶补偿值，然后根据同一绑点灰阶下不同像素的灰阶补偿值可以生成对应的灰阶补偿表。同理，可以得到其他绑点灰阶对应的灰阶补偿表。
烧录这些灰阶补偿表至显示面板的时序控制器中，并复位时序控制器(Reset TCON)。
然后对显示面板的灰阶补偿效果进行效果评估：当灰阶补偿效果符合预期补偿效果时，则可以结束上述灰阶补偿过程；当灰阶补偿效果不符合预期补偿效果时，判断灰阶补偿写入次数cycle是否小于2，如果灰阶补偿写入次数cycle小于2的话，则重复依次上述补偿过程；如果灰阶补偿写入次数cycle大于或者等于2的话，则可以结束上述灰阶补偿过程。
可以理解的是，上述灰阶补偿过程可以实现基于不同分区的gamma进行亮度-灰阶转换进行补偿，提高Panel各区域差异较大时的一次修复补偿效果，降低多次迭代修复带来的额外生产成本。
在Demura流程中，拍摄到的图片经过预处理之后将图像划分成m*n个分 区处理(m,n取值可根据Panel实际差异状况增减)，并拟合计算每个分区的gamma均值，在计算Panel各个像素点的补偿数据时，使用各自对应区域的gamma进行亮度-灰阶转换计算补偿值。可以解决Panel整面各区域的gamma与中心点差异较大时，单次Demura修复无法补偿到最佳的问题。
基于上述灰阶补偿过程，同理，可以降低灰阶补偿的次数，减小进行灰阶补偿所用的时间成本，进而降低显示面板的生产成本。
可以理解的是，对本领域普通技术人员来说，可以根据本申请的技术方案及其发明构思加以等同替换或改变，而所有这些改变或替换都应属于本申请所附的权利要求的保护范围。

Claims (20)

  1. 一种显示面板的灰阶补偿方法，包括：
    获取至少一组与显示面板的绑点灰阶对应的图像数据；
    根据所述图像数据，划分所述显示面板为显示主区和至少一个显示子区，及得到各所述显示子区的伽马平均值；以及
    基于所述显示子区的伽马平均值，确定所述显示子区中任一像素的绑点灰阶对应的灰阶补偿值。
  2. 根据权利要求1所述的灰阶补偿方法，其中，所述获取至少一组与所述显示面板的绑点灰阶对应的图像数据的步骤，包括：
    确定所述显示面板的多个绑点灰阶；
    基于每个所述绑点灰阶，获取一组所述图像数据，所述图像数据包括各像素的像素数据；
    确定所述像素数据的像素亮度和像素坐标。
  3. 根据权利要求2所述的灰阶补偿方法，其中，所述根据所述图像数据，划分所述显示面板为显示主区和至少一个显示子区，及得到各所述显示子区的伽马平均值的步骤，包括：
    确定所述图像数据中各像素之间的第一亮度差异阈值；
    基于所述第一亮度差异阈值和所述像素坐标，划分所述显示面板为显示主区和至少一个显示子区。
  4. 根据权利要求3所述的灰阶补偿方法，其中，所述根据所述图像数据，划分所述显示面板为显示主区和至少一个显示子区，及得到各所述显示子区的伽马平均值的步骤，还包括：
    基于同一像素的多组对应的绑点灰阶和像素亮度，拟合亮度-灰阶关系曲线；
    根据所述亮度-灰阶关系曲线，确定各像素的伽马值；
    基于所述各像素的伽马值和像素坐标，计算所述显示子区的伽马平均值。
  5. 根据权利要求4所述的灰阶补偿方法，其中，所述基于所述显示子区的伽马平均值，确定所述显示子区中任一像素的绑点灰阶对应的灰阶补偿值的步骤，包括：
    根据所述显示子区中各像素的伽马值，得到所述显示子区的伽马平均值；
    基于所述亮度-灰阶关系曲线和所述伽马平均值，确定任一像素的像素亮度对应的第一实际灰阶；
    基于所述亮度-灰阶关系曲线，确定目标灰阶，所述目标灰阶为所述显示主区中一像素的所述绑点灰阶对应的第二实际灰阶；
    根据所述第二实际灰阶与所述第一实际灰阶的差值结果，确定所述灰阶补偿值。
  6. 根据权利要求4所述的灰阶补偿方法，其中，所述基于所述亮度-灰阶关系曲线和所述伽马平均值，确定任一像素的像素亮度对应的第一实际灰阶的步骤，包括：
    根据所述像素的像素坐标，确定所述像素所在的显示子区；
    确定所述显示子区的伽马平均值为所述像素的伽马平均值；
    基于所述亮度-灰阶关系曲线和所述像素的伽马平均值，得到任一像素的第一实际灰阶。
  7. 根据权利要求1所述的灰阶补偿方法，其中，所述基于所述显示子区的伽马平均值，确定所述显示子区中任一像素的绑点灰阶对应的灰阶补偿值的步骤之后，还包括：
    基于所述至少一个显示子区中任一像素的绑点灰阶对应的灰阶补偿值，得到所述绑点灰阶对应的灰阶补偿表；
    烧录所述灰阶补偿表至所述显示面板。
  8. 根据权利要求7所述的灰阶补偿方法，其中，所述烧录所述灰阶补偿表至所述显示面板的步骤之后，还包括：
    获取所述灰阶补偿表对应的图像数据；
    评估所述显示面板的灰阶补偿效果；
    若所述灰阶补偿效果符合预期补偿效果，则结束所述灰阶补偿方法，所述预期补偿效果为所述显示子区中任一像素的像素亮度与所述显示主区中一像素的像素亮度之差小于或者等于第二亮度差异阈值；
    若所述灰阶补偿效果不符合预期补偿效果，则重复如权利要求1所述的灰阶补偿方法。
  9. 一种灰阶补偿装置，包括：
    获取模块，用于获取至少一组与所述显示面板的绑点灰阶对应的图像数据；
    处理模块，用于根据所述图像数据，划分所述显示面板为显示主区和至少一个显示子区，及得到各所述显示子区的伽马平均值；以及
    确定模块，用于基于所述显示子区的伽马平均值，确定所述显示子区中任一像素的绑点灰阶对应的灰阶补偿值。
  10. 根据权利要求9所述的灰阶补偿装置，其中，所述获取模块用于确定所述显示面板的多个绑点灰阶；基于每个所述绑点灰阶，获取一组所述图像数据，所述图像数据包括各像素的像素数据；确定所述像素数据的像素亮度和像素坐标。
  11. 根据权利要求10所述的灰阶补偿装置，其中，所述处理模块用于确定所述图像数据中各像素之间的第一亮度差异阈值；基于所述第一亮度差异阈值和所述像素坐标，划分所述显示面板为显示主区和至少一个显示子区。
  12. 根据权利要求11所述的灰阶补偿装置，其中，所述处理模块还用于基于同一像素的多组对应的绑点灰阶和像素亮度，拟合亮度-灰阶关系曲线；根据所述亮度-灰阶关系曲线，确定各像素的伽马值；基于所述各像素的伽马值和像素坐标，计算所述显示子区的伽马平均值。
  13. 根据权利要求12所述的灰阶补偿装置，其中，所述处理模块还用于根据所述显示子区中各像素的伽马值，得到所述显示子区的伽马平均值；基于所述亮度-灰阶关系曲线和所述伽马平均值，确定任一像素的像素亮度对应的第一实际灰阶；基于所述亮度-灰阶关系曲线，确定目标灰阶，所述目标灰阶为所述显示主区中一像素的所述绑点灰阶对应的第二实际灰阶；根据所述第二实际灰阶与所述第一实际灰阶的差值结果，确定所述灰阶补偿值。
  14. 根据权利要求12所述的灰阶补偿装置，其中，所述所述处理模块还用于根据所述像素的像素坐标，确定所述像素所在的显示子区；确定所述显示子区的伽马平均值为所述像素的伽马平均值；基于所述亮度-灰阶关系曲线和所述像素的伽马平均值，得到任一像素的第一实际灰阶。
  15. 根据权利要求9所述的灰阶补偿装置，其中，所述确定模块还用于基 于所述至少一个显示子区中任一像素的绑点灰阶对应的灰阶补偿值，得到所述绑点灰阶对应的灰阶补偿表；烧录所述灰阶补偿表至所述显示面板。
  16. 一种灰阶补偿系统，包括：
    显示面板；
    如权利要求9所述的灰阶补偿装置，用于确定所述显示面板的灰阶补偿值；
    烧录装置，与所述显示面板和所述灰阶补偿装置连接，用于烧录所述灰阶补偿值至所述显示面板。
  17. 根据权利要求16所述的灰阶补偿系统，其中，所述显示面板包括一显示主区和至少一个显示子区。
  18. 根据权利要求16所述的灰阶补偿系统，其中，所述显示面板的绑点灰阶包括灰阶L0、灰阶L25、灰阶L48、灰阶L64、灰阶L128、灰阶L225以及灰阶L255中的至少一个。
  19. 根据权利要求16所述的灰阶补偿系统，其中，所述获取模块包括相机。
  20. 根据权利要求17所述的灰阶补偿系统，其中，所述显示面板包括至少十四个显示子区。
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