WO2017140003A1 - 校准oled显示面板亮度不均的方法 - Google Patents

校准oled显示面板亮度不均的方法 Download PDF

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WO2017140003A1
WO2017140003A1 PCT/CN2016/075310 CN2016075310W WO2017140003A1 WO 2017140003 A1 WO2017140003 A1 WO 2017140003A1 CN 2016075310 W CN2016075310 W CN 2016075310W WO 2017140003 A1 WO2017140003 A1 WO 2017140003A1
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gamma
brightness
value
gray
fitting
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PCT/CN2016/075310
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English (en)
French (fr)
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邓宇帆
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深圳市华星光电技术有限公司
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Priority to US15/025,272 priority Critical patent/US9966042B2/en
Publication of WO2017140003A1 publication Critical patent/WO2017140003A1/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
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • 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]
    • 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
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • 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
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
    • 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
    • G09G2320/0693—Calibration of display systems

Definitions

  • the present invention relates to the field of OLED display technologies, and in particular, to a method for calibrating brightness unevenness of an OLED display panel.
  • the prior art of eliminating the OLED (Organic Light-Emitting Diode) panel Mura is similar to that of an LCD (Liquid Crystal Display), first obtaining the brightness of each pixel on the panel, and then detecting the Mura (Japanese, display technology field)
  • the term meaning uneven brightness, sets the ideal brightness of the Mura region, and finally calculates the grayscale value or voltage value required to compensate the Mura region according to the Gamma curve or according to the grayscale-luminance table.
  • OLED is different from LCD, and the Gamma curve of each pixel of LCD is relatively consistent.
  • the gamma curve of each pixel of OLED has a large difference, and Mura cannot be compensated according to the unified gamma curve.
  • one of the prior art techniques is to estimate the corrected gray scale value according to the gamma value and the ideal brightness, such as "a method and device for eliminating the liquid crystal display mura (application number 201310695713.X)": according to the input image
  • the corrected luminance value and the gamma index of each corresponding pixel point are used to calculate the corrected grayscale value of each pixel corresponding to the input image.
  • the disadvantage of this method is that the deviation of the Gamma curve is large for each pixel of the OLED panel, especially the Mura region. Calculating the gray scale value based on the uniform Gamma value or the Gamma curve does not achieve the expected compensation effect.
  • the normal area (brightness uniform area) has a brightness of 48 nit and the Mura area has a brightness of 44 nit.
  • several specific gray levels such as 32 gray scale, 64 gray scale, 224 gray scale, etc., are first taken, and the correction values of the Mura regions under these gray scales are obtained. Because the Gamma characteristics of the Mura area are unknown, a single adjustment often does not achieve the desired effect, and it is usually necessary to repeatedly take and fine-tune the gray scale. Can achieve uniform brightness. Then, the original grayscale-corrected grayscale lookup table of these grayscales is established, and finally, the interpolation is obtained to obtain correction values of other grayscales.
  • the gray scale of the Mura region is adjusted to 51 to achieve a uniform effect of full screen 48 nit. This method is extremely inefficient and requires repeated debugging to achieve uniform brightness.
  • the technical problem to be solved by the present invention is to provide a method for calibrating the brightness unevenness of an OLED display panel, which can improve the accuracy of calibrating brightness unevenness and improve the efficiency of calibration.
  • a technical solution adopted by the present invention is to provide a method for calibrating brightness unevenness of an OLED display panel, wherein the method includes: acquiring a brightness matrix of the OLED display panel under at least three gray levels, wherein At least three gray levels include: a highest gray level 255, a minimum reference gray level and a maximum reference gray level among the reference gray levels set when the Gamma is adjusted; a uniform brightness area and a brightness uneven area are determined according to the brightness matrix; The measured Gamma curve of the region is calculated according to the brightness matrix, and the fitting gamma value corresponding to each pixel point in the uneven region of the brightness is at least three gray scales; respectively, according to the measured Gamma curve and the fitting gamma value respectively, each of the luminance uneven regions is obtained.
  • a gamma-fitted Gamma curve; brightness calibration of the uneven brightness region according to the fitting gamma curve of each pixel; brightness calibration of the uneven brightness region according to the fitting gamma curve of each pixel point includes: A fitting gamma curve of a pixel calculates a gray-to-luminance correspondence table of each pixel; finding each pixel Gray - a correspondence table brightness table is corrected gray level value of each pixel and the luminance nonuniformity correction using the calibration area luminance grayscale value.
  • the calculating a gamma value corresponding to each pixel point in the luminance uneven region according to the luminance matrix corresponding to at least three gray levels includes: searching, according to the luminance matrix, a luminance value of each pixel in the luminance uneven region under at least three gray levels And calculating a fitting gamma value of each pixel point in at least three gray levels according to brightness values of each pixel in the luminance uneven region at at least three gray levels.
  • fitting the fitting gamma curve of each pixel point in the luminance uneven region according to the measured Gamma curve and the fitting gamma value respectively comprises: finding at least three measured gamma values corresponding to at least three gray scales on the measured Gamma curve; Calculating the measured Gamma value corresponding to each gray scale of at least three gray scales and the Gamma difference value fitting the Gamma value respectively; fitting the Gamma difference vector according to at least three gray scales and corresponding corresponding at least three Gamma difference values The fitted Gamma curve is obtained by subtracting the Gamma difference vector from the measured Gamma curve.
  • the Gamma difference vector is obtained according to the at least three gray scales and the corresponding at least three Gamma difference values including: using linear interpolation or curve fitting method according to at least three gray scales and corresponding at least three Gamma The difference fit yields a Gamma difference vector.
  • the boundary condition is set when the Gamma difference vector is obtained by fitting: the corresponding Gamma difference is 0 when the gray scale is zero; and the gray scale is greater than the maximum reference gray scale in the reference gray scale set by the adjustment Gamma and less than the highest
  • the corresponding gamma difference at gray level 255 is equal to the corresponding gamma difference at the maximum reference gray level.
  • the obtaining a brightness matrix of the OLED display panel under at least three gray levels includes: taking photos respectively under at least three gray levels; and analyzing the photos to obtain a corresponding brightness matrix under each gray level.
  • the length of the Gamma difference vector is 256
  • the nth element in the Gamma difference vector respectively represents the corresponding measured Gamma on the measured Gamma curve at the gray scale n-1 and the uneven brightness region in the gray scale n-1.
  • Each pixel fits the Gamma difference of the Gamma value.
  • another technical solution adopted by the present invention is to provide a method for calibrating brightness unevenness of an OLED display panel, the method comprising: acquiring a brightness matrix of an OLED display panel under at least three gray levels; The matrix determines the uniform area of brightness and the uneven area of brightness; The measured Gamma curve of the uniform brightness region is calculated, and the fitting gamma value corresponding to each pixel point in the uneven portion of the brightness is calculated according to the brightness matrix; the brightness is unevenly obtained according to the measured Gamma curve and the fitted gamma value respectively.
  • a fitting gamma curve for each pixel in the region; brightness calibration of the uneven luminance region is performed according to the fitted gamma curve of each pixel.
  • the calculating a gamma value corresponding to each pixel point in the luminance uneven region according to the luminance matrix corresponding to at least three gray levels includes: searching, according to the luminance matrix, a luminance value of each pixel in the luminance uneven region under at least three gray levels And calculating a fitting gamma value of each pixel point in at least three gray levels according to brightness values of each pixel in the luminance uneven region at at least three gray levels.
  • fitting the fitting gamma curve of each pixel point in the luminance uneven region according to the measured Gamma curve and the fitting gamma value respectively comprises: finding at least three measured gamma values corresponding to at least three gray scales on the measured Gamma curve; Calculating the measured Gamma value corresponding to each gray scale of at least three gray scales and the Gamma difference value fitting the Gamma value respectively; fitting the Gamma difference vector according to at least three gray scales and corresponding corresponding at least three Gamma difference values The fitted Gamma curve is obtained by subtracting the Gamma difference vector from the measured Gamma curve.
  • the Gamma difference vector is obtained according to the at least three gray scales and the corresponding at least three Gamma difference values including: using linear interpolation or curve fitting method according to at least three gray scales and corresponding at least three Gamma The difference fit yields a Gamma difference vector.
  • the boundary condition is set when the Gamma difference vector is obtained by fitting: the corresponding Gamma difference is 0 when the gray scale is zero; and the gray scale is greater than the maximum reference gray scale in the reference gray scale set by the adjustment Gamma and less than the highest
  • the corresponding gamma difference at gray level 255 is equal to the corresponding gamma difference at the maximum reference gray level.
  • the at least three gray levels include: a highest gray level 255, a minimum reference gray level and a maximum reference gray level among the reference gray levels set when the Gamma is adjusted.
  • the brightness correction of the uneven brightness region according to the fitting gamma curve of each pixel point includes: calculating a gray-to-luminance correspondence table of each pixel point according to the fitting gamma curve of each pixel point; searching for gray of each pixel point
  • the order-brightness table correspondence table obtains the corrected grayscale value of each pixel point and uses the corrected grayscale value to perform brightness calibration on the uneven brightness region.
  • the obtaining a brightness matrix of the OLED display panel under at least three gray levels includes: taking photos respectively under at least three gray levels; and analyzing the photos to obtain a corresponding brightness matrix under each gray level.
  • the length of the Gamma difference vector is 256
  • the nth element in the Gamma difference vector respectively represents the corresponding measured Gamma on the measured Gamma curve at the gray scale n-1 and the uneven brightness region in the gray scale n-1.
  • Each pixel fits the Gamma difference of the Gamma value.
  • the invention has the beneficial effects that the brightness matrix of the OLED display panel under at least three gray scales is obtained, and the uniform brightness region and the uneven brightness region are determined according to the brightness matrix, and then the brightness is measured.
  • the measured Gamma curve of the uniform region is calculated according to the luminance matrix, and the fitting gamma value corresponding to each pixel point in the uneven region of the luminance is at least three gray scales, and the luminance unevenness region is respectively obtained according to the measured Gamma curve and the fitting gamma value.
  • the gamma curve is fitted to each pixel, and the brightness unevenness is calibrated according to the fitting gamma curve of each pixel point, and the brightness matrix is obtained without repeated shooting and fine adjustment, and compared with the conventional interpolation correction method.
  • the invention fits the gamma curve by fitting each pixel point of the entire uneven brightness region and then calibrating, which is more accurate, thereby improving the accuracy of calibrating uneven brightness and improving the efficiency of calibration.
  • FIG. 1 is a flow chart of a preferred embodiment of a method for calibrating brightness unevenness of an OLED display panel of the present invention
  • Figure 2 is a schematic illustration of the fitting of a Gamma curve and a measured Gamma curve of the present invention.
  • FIG. 1 is a flow chart of a preferred embodiment of a method for calibrating brightness unevenness of an OLED display panel according to the present invention.
  • Figure 2 is a schematic illustration of the fitting of a Gamma curve and a measured Gamma curve of the present invention.
  • the fitted Gamma curve and the measured Gamma curve in Figure 2 are only illustrative, and the actual fitted Gamma curve and the measured Gamma curve may be other shapes.
  • the Gamma curve is also called the "gamma curve", and the Gamma is also called the "gamma”.
  • the method for calibrating the brightness unevenness of the OLED display panel includes the following steps:
  • Step S11 Acquire a brightness matrix of the OLED display panel under at least three gray levels.
  • step S11 preferably, acquiring the brightness matrix of the OLED display panel under at least three gray levels comprises: taking photos respectively under at least three gray levels; and parsing the photos to obtain a corresponding brightness matrix under each gray level.
  • the brightness matrix reflects the brightness of the pixel position and corresponding position.
  • the at least three gray levels include: a highest gray level 255, a minimum reference gray level and a maximum reference gray level among the reference gray levels set when the Gamma is adjusted.
  • Step S12 determining a uniform luminance region and a luminance uneven region according to the luminance matrix.
  • Step S13 measuring the measured Gamma curve of the uniform brightness region, and calculating a fitting gamma value corresponding to each pixel point in the luminance uneven region corresponding to at least three gray levels according to the luminance matrix.
  • step S13 calculating, according to the luminance matrix, a fitting gamma value corresponding to each pixel point in the luminance uneven region in at least three gray levels includes: searching for each pixel point in the luminance uneven region according to the luminance matrix under at least three gray levels The brightness value is calculated; the fitting gamma value of each pixel point under at least three gray levels is calculated according to the brightness values of the respective pixels in the luminance uneven region at at least three gray levels.
  • the fitted gamma value is used to fit the gamma curve of each pixel of the uneven brightness region, which is calculated by the above method and is not obtained by fitting.
  • the gamma curves of the respective pixels of the uniform brightness region are identical.
  • Step S14 fitting a Gamma curve of each pixel in the uneven region of the luminance according to the measured Gamma curve and the fitted Gamma value.
  • step S14 fitting the fitted Gamma curve of each pixel point in the luminance unevenness region according to the measured Gamma curve and the fitting gamma value respectively includes: finding at least three measured values corresponding to at least three gray scales on the measured Gamma curve. a Gamma value; respectively calculating a measured Gamma value corresponding to each of the at least three gray scales and a Gamma difference value fitting the Gamma value; and fitting the Gamma according to at least three gray scales and corresponding corresponding at least three Gamma difference values Difference vector; the Gamma curve is obtained by subtracting the Gamma difference vector from the measured Gamma curve.
  • ⁇ pixel is a fitting gamma value corresponding to a pixel (calculated in step S13).
  • the Gamma difference vector obtained by fitting at least three gray scales and corresponding at least three Gamma difference values comprises: using linear interpolation or curve fitting according to at least three gray scales and corresponding at least three Gamma differences Fit to get the Gamma difference vector.
  • the gray scale and its corresponding Gamma difference are in a linear relationship.
  • the boundary condition is set as follows: the corresponding Gamma difference is 0 when the gray scale is zero; and the gray scale is larger than the maximum reference gray scale in the reference gray scale set by the adjustment Gamma and smaller than the highest gray scale
  • ⁇ (0) represents the Gamma difference at zero gray scale, that is, the difference between the corresponding Gamma value on the measured curve at zero gray scale and the Gamma value of the pixel in the Mura region
  • x represents gray scale
  • x ref represents adjustment The maximum reference gray level when Gamma.
  • Step S15 performing brightness on the uneven brightness region according to the fitting gamma curve of each pixel point calibration.
  • step S15 performing brightness correction on the luminance uneven region according to the fitting gamma curve of each pixel point includes: calculating a gray-to-luminance correspondence table of each pixel point according to the fitting gamma curve of each pixel point; searching for each pixel The gray scale-brightness table correspondence table of the points obtains the corrected gray scale values of the respective pixel points and uses the corrected gray scale values to perform brightness calibration on the uneven areas of the brightness.
  • the brightness of the uniform brightness region is 48 nit
  • the brightness of the uneven brightness region is 44 nit.
  • the fitting Gamma curve a gray scale and brightness correspondence table of the uneven brightness region can be obtained, thereby finding the gray scale value corresponding to 48 nit, and correcting the gray scale of the pixel point.
  • the invention obtains the brightness matrix of the OLED display panel under at least three gray levels, determines the uniform brightness area and the uneven brightness area according to the brightness matrix, and then measures the measured Gamma curve of the uniform brightness area, and calculates the uneven brightness area according to the brightness matrix.
  • the fitted gamma curve performs brightness calibration on the uneven brightness region, and does not require repeated shooting and fine adjustment to obtain the brightness matrix, and the present invention adopts fitting each pixel point of the entire uneven brightness region compared to the conventional interpolation correction value method.
  • the Gamma curve is then calibrated to be more accurate, thus improving the accuracy of calibrating uneven brightness and improving the efficiency of calibration.

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Abstract

一种校准OLED显示面板亮度不均的方法，包括：获取OLED显示面板在至少三个灰阶下的亮度矩阵（S11）；根据亮度矩阵确定亮度均匀区域和亮度不均匀区域（S12）；测量亮度均匀区域的实测Gamma曲线，根据亮度矩阵计算亮度不均匀区域中各个像素点在至少三个灰阶对应的拟合Gamma值（S13）；根据实测Gamma曲线、拟合Gamma值分别拟合得到亮度不均匀区域中每一像素点的拟合Gamma曲线（S14）；根据每一像素点的拟合Gamma曲线对亮度不均匀区域进行亮度校准（S15）。校准亮度不均的方法能够提高校准的精度和效率。

Description

校准OLED显示面板亮度不均的方法 【技术领域】
本发明涉及OLED显示技术领域，特别是涉及一种校准OLED显示面板亮度不均的方法。
【背景技术】
消除OLED(Organic Light-Emitting Diode，有机发光二极管)面板Mura的现有技术与LCD(Liquid Crystal Display，液晶显示器)相似，首先获取面板上各个像素点的亮度，然后检测Mura(日语，显示技术领域术语，意为亮度不均)、设定Mura区域理想亮度，最后根据Gamma曲线，或根据灰阶——亮度表，计算补偿Mura区域所需的灰阶值或电压值。
但OLED不同于LCD，LCD的各像素点Gamma曲线相对一致，OLED的各像素点Gamma曲线差异大，不能依照统一的Gamma曲线补偿Mura。
目前，已有的技术中，一种是根据Gamma值和理想亮度，推算修正后的灰阶值，如“一种消除液晶显示器mura的方法及装置(申请号201310695713.X)”：根据输入图像对应的每个像素点的修正后的亮度值以及gamma指数计算得到输入图像对应的每个像素点的修正后的灰阶值。而这种方式的缺点在于，OLED面板各像素，特别是Mura区域，Gamma曲线的偏差较大。根据统一的Gamma值或Gamma曲线推算灰阶值，不能达到预期补偿效果。
因此在实际应用中，为得到一个灰阶的理想修正值，需要反复地拍摄→微调灰阶→拍摄→微调灰阶。因为时间有限，以上述方式仅能得到若干灰阶的修正值，再内插得到剩余灰阶的修正值。
假设在48灰阶下，正常区域(亮度均匀区域)的亮度为48nit，Mura区域的亮度为44nit。依照传统方案，首先拍摄几个特定灰阶，如32灰阶、64灰阶、224灰阶等，并得到这几个灰阶下Mura区域的修正值。因为Mura区域的Gamma特性未知，单次调整往往达不到理想效果，通常需要反复拍摄、微调灰阶，才 能达到均匀亮度。然后，建立这几个灰阶的原灰阶-修正灰阶查找表，最后，内插得到其他灰阶的修正值。假设48灰阶对应的内插修正值为51灰阶，则将Mura区域的灰阶调整为51，以达到全屏48nit的均匀效果。这种方式效率极低，需要反复调试才能达亮度均匀。
因此，需要提供一种校准OLED显示面板亮度不均的方法，以解决上述技术问题。
【发明内容】
本发明主要解决的技术问题是提供一种校准OLED显示面板亮度不均的方法，能够提高校准亮度不均的精度以及提高校准的效率。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种校准OLED显示面板亮度不均的方法，其中，该方法包括：获取OLED显示面板在至少三个灰阶下的亮度矩阵，其中，至少三个灰阶包括：最高灰阶255、调节Gamma时设定的参考灰阶中的最小参考灰阶和最大参考灰阶；根据亮度矩阵确定亮度均匀区域和亮度不均匀区域；测量亮度均匀区域的实测Gamma曲线，根据亮度矩阵计算亮度不均匀区域中各个像素点在至少三个灰阶对应的拟合Gamma值；根据实测Gamma曲线、拟合Gamma值分别拟合得到亮度不均匀区域中每一像素点的拟合Gamma曲线；根据每一像素点的拟合Gamma曲线对亮度不均匀区域进行亮度校准；根据每一像素点的拟合Gamma曲线对亮度不均匀区域进行亮度校准包括：根据各个像素点的拟合Gamma曲线计算各个像素点的灰阶-亮度对应关系表；查找各个像素点的灰阶-亮度表对应关系表得到各个像素点的修正灰阶值并利用修正灰阶值对亮度不均匀区域进行亮度校准。
其中，根据亮度矩阵计算亮度不均匀区域中各个像素点在至少三个灰阶对应的拟合Gamma值包括：根据亮度矩阵查找亮度不均匀区域中各个像素点在至少三个灰阶下的亮度值；根据亮度不均匀区域中各个像素点在至少三个灰阶下的亮度值计算各个像素点在至少三个灰阶下的拟合Gamma值。
其中，根据亮度不均匀区域中各个像素点在至少三个灰阶下的亮度值计算各个像素点在至少三个灰阶下的拟合Gamma值包括：根据公式γpixel＝ln(L/Lmax)/ln(x/255)计算各个像素点在至少三个灰阶下的拟合Gamma值，其中，γpixel为拟合Gamma值，x为灰阶值，L为相应灰阶下的亮度值，Lmax为最高灰阶255下的亮度值。
其中，根据实测Gamma曲线、拟合Gamma值分别拟合亮度不均匀区域中每一像素点的拟合Gamma曲线包括：找到至少三个灰阶在实测Gamma曲线上对应的至少三个实测Gamma值；分别计算至少三个灰阶中每一个灰阶对应的实测Gamma值和拟合Gamma值的Gamma差值；根据至少三个灰阶及其对应的至少三个Gamma差值拟合得到Gamma差值向量；用实测Gamma曲线减去Gamma差值向量得到拟合Gamma曲线。
其中，根据至少三个灰阶及其对应的至少三个Gamma差值拟合得到Gamma差值向量包括：利用线性内插法或曲线拟合法根据至少三个灰阶及其对应的至少三个Gamma差值拟合得到Gamma差值向量。
其中，拟合得到Gamma差值向量时设定边界条件为：灰阶为零时对应的Gamma差值为0；以及灰阶大于调节Gamma设定的参考灰阶中的最大参考灰阶且小于最高灰阶255时对应的Gamma差值等于在最大参考灰阶时对应的Gamma差值。
其中，获取OLED显示面板在至少三个灰阶下的亮度矩阵包括：分别在至少三个灰阶下拍摄得到照片；解析照片以获取每个灰阶下对应的亮度矩阵。
其中，Gamma差值向量长度为256，Gamma差值向量中的第n位元素分别表示在灰阶n-1时实测Gamma曲线上对应的实测Gamma与在灰阶n-1时亮度不均匀区域中各个像素点拟合Gamma值的Gamma差值。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种校准OLED显示面板亮度不均的方法，该方法包括：获取OLED显示面板在至少三个灰阶下的亮度矩阵；根据亮度矩阵确定亮度均匀区域和亮度不均匀区域；测 量亮度均匀区域的实测Gamma曲线，根据亮度矩阵计算亮度不均匀区域中各个像素点在至少三个灰阶对应的拟合Gamma值；根据实测Gamma曲线、拟合Gamma值分别拟合得到亮度不均匀区域中每一像素点的拟合Gamma曲线；根据每一像素点的拟合Gamma曲线对亮度不均匀区域进行亮度校准。
其中，根据亮度矩阵计算亮度不均匀区域中各个像素点在至少三个灰阶对应的拟合Gamma值包括：根据亮度矩阵查找亮度不均匀区域中各个像素点在至少三个灰阶下的亮度值；根据亮度不均匀区域中各个像素点在至少三个灰阶下的亮度值计算各个像素点在至少三个灰阶下的拟合Gamma值。
其中，根据亮度不均匀区域中各个像素点在至少三个灰阶下的亮度值计算各个像素点在至少三个灰阶下的拟合Gamma值包括：根据公式γpixel＝ln(L/Lmax)/ln(x/255)计算各个像素点在至少三个灰阶下的拟合Gamma值，其中，γpixel为拟合Gamma值，x为灰阶值，L为相应灰阶下的亮度值，Lmax为最高灰阶255下的亮度值。
其中，根据实测Gamma曲线、拟合Gamma值分别拟合亮度不均匀区域中每一像素点的拟合Gamma曲线包括：找到至少三个灰阶在实测Gamma曲线上对应的至少三个实测Gamma值；分别计算至少三个灰阶中每一个灰阶对应的实测Gamma值和拟合Gamma值的Gamma差值；根据至少三个灰阶及其对应的至少三个Gamma差值拟合得到Gamma差值向量；用实测Gamma曲线减去Gamma差值向量得到拟合Gamma曲线。
其中，根据至少三个灰阶及其对应的至少三个Gamma差值拟合得到Gamma差值向量包括：利用线性内插法或曲线拟合法根据至少三个灰阶及其对应的至少三个Gamma差值拟合得到Gamma差值向量。
其中，拟合得到Gamma差值向量时设定边界条件为：灰阶为零时对应的Gamma差值为0；以及灰阶大于调节Gamma设定的参考灰阶中的最大参考灰阶且小于最高灰阶255时对应的Gamma差值等于在最大参考灰阶时对应的Gamma差值。
其中，至少三个灰阶包括：最高灰阶255、调节Gamma时设定的参考灰阶中的最小参考灰阶和最大参考灰阶。
其中，根据每一像素点的拟合Gamma曲线对亮度不均匀区域进行亮度校正包括：根据各个像素点的拟合Gamma曲线计算各个像素点的灰阶-亮度对应关系表；查找各个像素点的灰阶-亮度表对应关系表得到各个像素点的修正灰阶值并利用修正灰阶值对亮度不均匀区域进行亮度校准。
其中，获取OLED显示面板在至少三个灰阶下的亮度矩阵包括：分别在至少三个灰阶下拍摄得到照片；解析照片以获取每个灰阶下对应的亮度矩阵。
其中，Gamma差值向量长度为256，Gamma差值向量中的第n位元素分别表示在灰阶n-1时实测Gamma曲线上对应的实测Gamma与在灰阶n-1时亮度不均匀区域中各个像素点拟合Gamma值的Gamma差值。
本发明的有益效果是：区别于现有技术的情况，本发明通过获取OLED显示面板在至少三个灰阶下的亮度矩阵，再根据亮度矩阵确定亮度均匀区域和亮度不均匀区域，然后测量亮度均匀区域的实测Gamma曲线，根据亮度矩阵计算亮度不均匀区域中各个像素点在至少三个灰阶对应的拟合Gamma值，根据实测Gamma曲线、拟合Gamma值分别拟合得到亮度不均匀区域中每一像素点的拟合Gamma曲线，根据每一像素点的拟合Gamma曲线对亮度不均匀区域进行亮度校准，无需反复的拍摄、微调获得亮度矩阵，且相比传统的内插修正值方式本发明采用拟合整个亮度不均匀区域的每一个像素点拟合Gamma曲线然后进行校准，更为准确，因此能够提高校准亮度不均的精度以及提高校准的效率。
【附图说明】
图1是本发明校准OLED显示面板亮度不均的方法优选实施例的流程图；
图2是本发明拟合Gamma曲线和实测Gamma曲线的示意图。
【具体实施方式】
下面结合附图和实施例对本发明进行详细的说明。
请结合参阅图1和图2，图1是本发明校准OLED显示面板亮度不均的方法优选实施例的流程图。图2是本发明拟合Gamma曲线和实测Gamma曲线的示意图。图2中拟合Gamma曲线和实测Gamma曲线仅为示意，实际的拟合Gamma曲线和实测Gamma曲线可以为其他的形状。Gamma曲线又称“伽马曲线”，Gamma又称“伽马”。在本实施例中，校准OLED显示面板亮度不均的方法包括以下步骤：
步骤S11：获取OLED显示面板在至少三个灰阶下的亮度矩阵。
在步骤S11中，优选地，获取OLED显示面板在至少三个灰阶下的亮度矩阵包括：分别在至少三个灰阶下拍摄得到照片；解析照片以获取每个灰阶下对应的亮度矩阵。
亮度矩阵体现像素点位置和对应位置的亮度。
优选地，至少三个灰阶包括：最高灰阶255、调节Gamma时设定的参考灰阶中的最小参考灰阶和最大参考灰阶。
步骤S12：根据亮度矩阵确定亮度均匀区域和亮度不均匀区域。
步骤S13：测量亮度均匀区域的实测Gamma曲线，根据亮度矩阵计算亮度不均匀区域中各个像素点在至少三个灰阶对应的拟合Gamma值。
在步骤S13中，根据亮度矩阵计算亮度不均匀区域中各个像素点在至少三个灰阶对应的拟合Gamma值包括：根据亮度矩阵查找亮度不均匀区域中各个像素点在至少三个灰阶下的亮度值；根据亮度不均匀区域中各个像素点在至少三个灰阶下的亮度值计算各个像素点在至少三个灰阶下的拟合Gamma值。
拟合Gamma值为用于拟合亮度不均匀区域各个像素点的Gamma曲线，由上述方法计算所得，并非拟合得到。
亮度均匀区域的各个像素点的Gamma曲线一致。
根据亮度不均匀区域中各个像素点在至少三个灰阶下的亮度值计算各个像素点在至少三个灰阶下的拟合Gamma值包括：根据公式γpixel＝ln(L/Lmax)/ln(x/255) (1)计算各个像素点在至少三个灰阶下的拟合Gamma值，其中，γpixel为拟合Gamma值，x为灰阶值，L为相应灰阶下的亮度值，Lmax为最高灰阶255下的亮度值。
步骤S14：根据实测Gamma曲线、拟合Gamma值分别拟合得到亮度不均匀区域中每一像素点的拟合Gamma曲线。
在步骤S14中，根据实测Gamma曲线、拟合Gamma值分别拟合亮度不均匀区域中每一像素点的拟合Gamma曲线包括：找到至少三个灰阶在实测Gamma曲线上对应的至少三个实测Gamma值；分别计算至少三个灰阶中每一个灰阶对应的实测Gamma值和拟合Gamma值的Gamma差值；根据至少三个灰阶及其对应的至少三个Gamma差值拟合得到Gamma差值向量；用实测Gamma曲线减去Gamma差值向量得到拟合Gamma曲线。
优选地，根据公式Δγ(x)＝γmeas-γpixel(2)计算Gamma差值，其中Δγ是Gamma差值，x是灰阶值，γmeas是实测Gamma曲线上在相应灰阶的值，γpixel是对应像素点的拟合Gamma值(步骤S13中计算得到)。
根据至少三个灰阶及其对应的至少三个Gamma差值拟合得到Gamma差值向量包括：利用线性内插法或曲线拟合法根据至少三个灰阶及其对应的至少三个Gamma差值拟合得到Gamma差值向量。优选地，灰阶及其对应的Gamma差值为线性关系。
拟合得到Gamma差值向量时设定边界条件为：灰阶为零时对应的Gamma差值为0；以及灰阶大于调节Gamma设定的参考灰阶中的最大参考灰阶且小于最高灰阶255时对应的Gamma差值等于在最大参考灰阶时对应的Gamma差值。即边界条件为：Δγ(0)＝0(3)；Δγ(x)＝Δγ(xref)，xref＜x＜255  (4)。
其中，Δγ(0)表示零灰阶下的Gamma差值，即零灰阶时实测曲线上对应的Gamma值和Mura区域中像素点的Gamma值的差值，x表示灰阶，xref表示调节Gamma时的最大参考灰阶。
步骤S15：根据每一像素点的拟合Gamma曲线对亮度不均匀区域进行亮度 校准。
在步骤S15中，根据每一像素点的拟合Gamma曲线对亮度不均匀区域进行亮度校正包括：根据各个像素点的拟合Gamma曲线计算各个像素点的灰阶-亮度对应关系表；查找各个像素点的灰阶-亮度表对应关系表得到各个像素点的修正灰阶值并利用修正灰阶值对亮度不均匀区域进行亮度校准。
举例说明，假设48灰阶下，亮度均匀区域的亮度为48nit，亮度不均匀区域的亮度为44nit。根据本实施例的方案，首先拍摄至少3个灰阶，再结合亮度均匀区域的实测Gamma曲线，即可拟合出亮度不均匀区域各像素点的拟合Gamma曲线。根据拟合Gamma曲线，可得到亮度不均匀区域的灰阶和亮度对应关系表，从而找到48nit对应的灰阶值，修正该像素点的灰阶。
本发明通过获取OLED显示面板在至少三个灰阶下的亮度矩阵，再根据亮度矩阵确定亮度均匀区域和亮度不均匀区域，然后测量亮度均匀区域的实测Gamma曲线，根据亮度矩阵计算亮度不均匀区域中各个像素点在至少三个灰阶对应的拟合Gamma值，根据实测Gamma曲线、拟合Gamma值分别拟合得到亮度不均匀区域中每一像素点的拟合Gamma曲线，根据每一像素点的拟合Gamma曲线对亮度不均匀区域进行亮度校准，无需反复的拍摄、微调获得亮度矩阵，且相比传统的内插修正值方式本发明采用拟合整个亮度不均匀区域的每一个像素点拟合Gamma曲线然后进行校准，更为准确，因此能够提高校准亮度不均的精度以及提高校准的效率。
以上所述仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (18)

  1. 一种校准OLED显示面板亮度不均的方法，其中，所述方法包括：
    获取OLED显示面板在至少三个灰阶下的亮度矩阵，其中，所述至少三个灰阶包括：最高灰阶255、调节Gamma时设定的参考灰阶中的最小参考灰阶和最大参考灰阶；
    根据所述亮度矩阵确定亮度均匀区域和亮度不均匀区域；
    测量所述亮度均匀区域的实测Gamma曲线，根据所述亮度矩阵计算所述亮度不均匀区域中各个像素点在所述至少三个灰阶对应的拟合Gamma值；
    根据所述实测Gamma曲线、所述拟合Gamma值分别拟合得到所述亮度不均匀区域中每一像素点的拟合Gamma曲线；
    根据所述每一像素点的所述拟合Gamma曲线对所述亮度不均匀区域进行亮度校准；
    所述根据所述每一像素点的所述拟合Gamma曲线对所述亮度不均匀区域进行亮度校准包括：根据各个像素点的所述拟合Gamma曲线计算各个像素点的灰阶-亮度对应关系表；查找各个像素点的所述灰阶-亮度表对应关系表得到所述各个像素点的修正灰阶值并利用所述修正灰阶值对所述亮度不均匀区域进行亮度校准。
  2. 根据权利要求1所述的方法，其中，根据所述亮度矩阵计算所述亮度不均匀区域中各个像素点在所述至少三个灰阶对应的拟合Gamma值包括：
    根据所述亮度矩阵查找所述亮度不均匀区域中各个像素点在所述至少三个灰阶下的亮度值；
    根据所述亮度不均匀区域中各个像素点在所述至少三个灰阶下的亮度值计算各个像素点在所述至少三个灰阶下的拟合Gamma值。
  3. 根据权利要求2所述的方法，其中，根据所述亮度不均匀区域中各个像素点在所述至少三个灰阶下的亮度值计算各个像素点在所述至少三个灰阶下的拟合Gamma值包括：
    根据公式γpixel＝ln(L/Lmax)/ln(x/255)计算各个像素点在所述至少三个灰阶下的拟合Gamma值，其中，γpixel为所述拟合Gamma值，x为灰阶值，L为相应灰阶下的亮度值，Lmax为最高灰阶255下的亮度值。
  4. 根据权利要求1所述的方法，其中，所述根据所述实测Gamma曲线、所述拟合Gamma值分别拟合所述亮度不均匀区域中每一像素点的拟合Gamma曲线包括：
    找到所述至少三个灰阶在实测Gamma曲线上对应的至少三个实测Gamma值；
    分别计算所述至少三个灰阶中每一个灰阶对应的实测Gamma值和拟合Gamma值的Gamma差值；
    根据所述至少三个灰阶及其对应的至少三个Gamma差值拟合得到Gamma差值向量；
    用所述实测Gamma曲线减去所述Gamma差值向量得到拟合Gamma曲线。
  5. 根据权利要求4所述的方法，其中，根据所述至少三个灰阶及其对应的至少三个Gamma差值拟合得到Gamma差值向量包括：
    利用线性内插法或曲线拟合法根据所述至少三个灰阶及其对应的至少三个Gamma差值拟合得到Gamma差值向量。
  6. 根据权利要求4所述的方法，其中，拟合得到Gamma差值向量时设定边界条件为：灰阶为零时对应的Gamma差值为0；以及灰阶大于调节Gamma设定的参考灰阶中的最大参考灰阶且小于最高灰阶255时对应的Gamma差值等于在所述最大参考灰阶时对应的Gamma差值。
  7. 根据权利要求1所述的方法，其中，所述获取OLED显示面板在至少三个灰阶下的亮度矩阵包括：
    分别在所述至少三个灰阶下拍摄得到照片；
    解析所述照片以获取每个灰阶下对应的亮度矩阵。
  8. 根据权利要求4所述的方法，其中，所述Gamma差值向量长度为256， 所述Gamma差值向量中的第n位元素分别表示在灰阶n-1时所述实测Gamma曲线上对应的实测Gamma与在灰阶n-1时所述亮度不均匀区域中各个像素点拟合Gamma值的Gamma差值。
  9. 一种校准OLED显示面板亮度不均的方法，其中，所述方法包括：
    获取OLED显示面板在至少三个灰阶下的亮度矩阵；
    根据所述亮度矩阵确定亮度均匀区域和亮度不均匀区域；
    测量所述亮度均匀区域的实测Gamma曲线，根据所述亮度矩阵计算所述亮度不均匀区域中各个像素点在所述至少三个灰阶对应的拟合Gamma值；
    根据所述实测Gamma曲线、所述拟合Gamma值分别拟合得到所述亮度不均匀区域中每一像素点的拟合Gamma曲线；
    根据所述每一像素点的所述拟合Gamma曲线对所述亮度不均匀区域进行亮度校准。
  10. 根据权利要求9所述的方法，其中，根据所述亮度矩阵计算所述亮度不均匀区域中各个像素点在所述至少三个灰阶对应的拟合Gamma值包括：
    根据所述亮度矩阵查找所述亮度不均匀区域中各个像素点在所述至少三个灰阶下的亮度值；
    根据所述亮度不均匀区域中各个像素点在所述至少三个灰阶下的亮度值计算各个像素点在所述至少三个灰阶下的拟合Gamma值。
  11. 根据权利要求10所述的方法，其中，根据所述亮度不均匀区域中各个像素点在所述至少三个灰阶下的亮度值计算各个像素点在所述至少三个灰阶下的拟合Gamma值包括：
    根据公式γpixel＝ln(L/Lmax)/ln(x/255)计算各个像素点在所述至少三个灰阶下的拟合Gamma值，其中，γpixel为所述拟合Gamma值，x为灰阶值，L为相应灰阶下的亮度值，Lmax为最高灰阶255下的亮度值。
  12. 根据权利要求9所述的方法，其中，所述根据所述实测Gamma曲线、所述拟合Gamma值分别拟合所述亮度不均匀区域中每一像素点的拟合Gamma 曲线包括：
    找到所述至少三个灰阶在实测Gamma曲线上对应的至少三个实测Gamma值；
    分别计算所述至少三个灰阶中每一个灰阶对应的实测Gamma值和拟合Gamma值的Gamma差值；
    根据所述至少三个灰阶及其对应的至少三个Gamma差值拟合得到Gamma差值向量；
    用所述实测Gamma曲线减去所述Gamma差值向量得到拟合Gamma曲线。
  13. 根据权利要求12所述的方法，其中，根据所述至少三个灰阶及其对应的至少三个Gamma差值拟合得到Gamma差值向量包括：
    利用线性内插法或曲线拟合法根据所述至少三个灰阶及其对应的至少三个Gamma差值拟合得到Gamma差值向量。
  14. 根据权利要求12所述的方法，其中，拟合得到Gamma差值向量时设定边界条件为：灰阶为零时对应的Gamma差值为0；以及灰阶大于调节Gamma设定的参考灰阶中的最大参考灰阶且小于最高灰阶255时对应的Gamma差值等于在所述最大参考灰阶时对应的Gamma差值。
  15. 根据权利要求9任一项所述的方法，其中，所述至少三个灰阶包括：最高灰阶255、调节Gamma时设定的参考灰阶中的最小参考灰阶和最大参考灰阶。
  16. 根据权利要求9任一项所述的方法，其中，所述根据所述每一像素点的所述拟合Gamma曲线对所述亮度不均匀区域进行亮度校准包括：
    根据各个像素点的所述拟合Gamma曲线计算各个像素点的灰阶-亮度对应关系表；
    查找各个像素点的所述灰阶-亮度表对应关系表得到所述各个像素点的修正灰阶值并利用所述修正灰阶值对所述亮度不均匀区域进行亮度校准。
  17. 根据权利要求9所述的方法，其中，所述获取OLED显示面板在至少 三个灰阶下的亮度矩阵包括：
    分别在所述至少三个灰阶下拍摄得到照片；
    解析所述照片以获取每个灰阶下对应的亮度矩阵。
  18. 根据权利要求12所述的方法，其中，所述Gamma差值向量长度为256，所述Gamma差值向量中的第n位元素分别表示在灰阶n-1时所述实测Gamma曲线上对应的实测Gamma与在灰阶n-1时所述亮度不均匀区域中各个像素点拟合Gamma值的Gamma差值。
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