WO2017166348A1 - 消除OLED显示面板Mura的方法 - Google Patents

消除OLED显示面板Mura的方法 Download PDF

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WO2017166348A1
WO2017166348A1 PCT/CN2016/080327 CN2016080327W WO2017166348A1 WO 2017166348 A1 WO2017166348 A1 WO 2017166348A1 CN 2016080327 W CN2016080327 W CN 2016080327W WO 2017166348 A1 WO2017166348 A1 WO 2017166348A1
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display panel
oled display
gray scale
brightness
gamma value
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PCT/CN2016/080327
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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 US15/108,779 priority Critical patent/US10121408B2/en
Publication of WO2017166348A1 publication Critical patent/WO2017166348A1/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
    • G09G3/22—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
    • G09G3/20—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
    • G09G3/2074—Display of intermediate tones using sub-pixels
    • 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
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
    • G09G2320/0295—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel by monitoring each display pixel
    • 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

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a method for eliminating an OLED display panel Mura.
  • the flat display device has many advantages such as thin body, power saving, no radiation, and has been widely used.
  • the existing flat display devices mainly include a liquid crystal display (LCD) and an organic light emitting display (OLED).
  • the organic light-emitting diode display device has the advantages of self-luminescence, no backlight, high contrast, thin thickness, wide viewing angle, fast response speed, flexible panel, wide temperature range, simple structure and simple process. It is considered to be an emerging application technology for next-generation flat panel displays.
  • An OLED display device generally includes a substrate, an anode disposed on the substrate, an organic light-emitting layer disposed on the anode, an electron transport layer disposed on the organic light-emitting layer, and a cathode disposed on the electron transport layer.
  • the holes from the anode and the electrons from the cathode are emitted to the organic light-emitting layer, and these electrons and holes are combined to generate an excited electron-hole pair, and the excited electron-hole pair is converted from the excited state to the ground state. Achieve light.
  • Demura technology is a technology that eliminates the display Mura and makes the picture brightness uniform.
  • the basic principle of Demura technology is to let the panel display the grayscale image, capture the screen with a capacitive coupled device (CCD), obtain the brightness value of each pixel in the panel, and then adjust the grayscale value of the pixel in the Mura region or The voltage makes the area that is too dark and the area that is too bright becomes dark, achieving a uniform display effect.
  • CCD capacitive coupled device
  • the Demura algorithm used in the prior art generally estimates the corrected gray scale value according to the gamma value and the target brightness.
  • the method for eliminating the liquid crystal display mura disclosed in the patent document CN201310695713.X is as follows: First, the brightness value of each pixel is obtained, and the brightness value of each pixel is corrected according to the brightness correction coefficient, and then the correction of each pixel corresponding to the input image is calculated according to the corrected brightness value and the gamma index of each pixel. After the grayscale value, the specific calculation formula: Where L1 is the corrected brightness value, X1 is the corrected gray level value, and Y is the gamma index.
  • the deviation of the gamma curve of each pixel point, especially the Mura region is large, and a single estimation is performed according to the unified gamma value or gamma curve, and the expected compensation effect cannot be achieved, so the existing Demura algorithm is Not applicable to OLED display panels.
  • the object of the present invention is a method for eliminating the OLED display panel Mura, which can quickly and effectively eliminate the OLED display panel Mura, ensure uniform brightness of the OLED display panel, and improve the display quality of the OLED display panel.
  • the present invention provides a method for eliminating an OLED display panel Mura, comprising the following steps:
  • Step 1 providing an OLED display panel and a brightness acquiring device, so that the OLED display panel displays 255 gray scales, and the brightness obtaining device obtains the actual brightness of each sub-pixel of the OLED display panel at 255 gray scales;
  • Step 2 causing the OLED display panel to display the gray scale to be compensated
  • Step 3 Obtain the actual brightness of each sub-pixel of the OLED display panel under the current display gray scale by using the brightness acquiring device;
  • Step 4 Calculate the local gamma value under the current gray scale, and calculate the formula as follows:
  • i is an integer greater than or equal to 0
  • i+1 is the number of times the current iteration is calculated
  • Gamma i is the local gamma value under the currently displayed grayscale
  • L i is the actual luminance of the subpixel under the current grayscale display
  • L 255 For the actual brightness of the sub-pixels under 255 grayscale
  • Gray i is the current display grayscale
  • Step 5 Obtain a gamma value of the OLED display panel and a target brightness preset by each sub-pixel, and select a corresponding calculation formula by comparing a gamma value of the OLED display panel with a local gamma value of the currently displayed gray scale to calculate Obtain the compensation gray scale that should be used to achieve the target brightness preset by the sub-pixel.
  • the specific calculation formula and applicable conditions are:
  • the compensation gray scale to be used is calculated according to the following formula (1);
  • L goal is the target brightness of the sub-pixel
  • Gray i+1 is the compensation gray level
  • the compensation gray scale to be used is calculated according to the following formula (2);
  • ⁇ is the gamma value of the OLED display panel
  • Step 6 The OLED display panel displays the currently calculated compensation gray scale, and determines whether the preset end compensation gray scale calculation condition is reached;
  • the brightness acquisition device is a brightness meter.
  • the brightness acquisition device is a CCD.
  • the step 3 captures the photo of the display screen of the OLED display panel under the current gray scale by the CCD to obtain the actual brightness of each sub-pixel of the OLED display panel under the current display gray scale.
  • the condition for ending the gray scale calculation in the step 6 is that the difference between the actual brightness of the sub-pixel and the target brightness is less than the preset allowable deviation brightness.
  • the condition for ending the gray scale calculation in the step 6 is that the number of times of the current iteration calculation reaches the preset maximum iteration calculation number.
  • the preset maximum iteration calculation is three times.
  • the condition for ending the gray scale calculation in the step 6 is that the difference between the actual brightness of the sub-pixel and the target brightness is less than the preset error brightness or the number of times the current iteration calculation reaches the preset maximum iteration calculation.
  • the target brightness preset by each sub-pixel is obtained by a gamma curve corresponding to the gamma value of the OLED display panel.
  • the invention also provides a method for eliminating the OLED display panel Mura, comprising the following steps:
  • Step 1 Providing an OLED display panel and a brightness acquiring device to enable the OLED display surface
  • the board displays 255 gray scales, and obtains the actual brightness of each sub-pixel of the OLED display panel at 255 gray scales by using a brightness acquiring device;
  • Step 2 causing the OLED display panel to display the gray scale to be compensated
  • Step 3 Obtain the actual brightness of each sub-pixel of the OLED display panel under the current display gray scale by using the brightness acquiring device;
  • Step 4 Calculate the local gamma value under the current gray scale, and calculate the formula as follows:
  • i is an integer greater than or equal to 0
  • i+1 is the number of times the current iteration is calculated
  • Gamma i is the local gamma value under the currently displayed grayscale
  • L i is the actual luminance of the subpixel under the current grayscale display
  • L 255 For the actual brightness of the sub-pixels under 255 grayscale
  • Gray i is the current display grayscale
  • Step 5 Obtain a gamma value of the OLED display panel and a target brightness preset by each sub-pixel, and select a corresponding calculation formula by comparing a gamma value of the OLED display panel with a local gamma value of the currently displayed gray scale to calculate Obtain the compensation gray scale that should be used to achieve the target brightness preset by the sub-pixel.
  • the specific calculation formula and applicable conditions are:
  • the compensation gray scale to be used is calculated according to the following formula
  • L goal is the target brightness of the sub-pixel
  • Gray i+1 is the compensation gray level
  • the compensation gray scale to be used is calculated according to the following formula
  • ⁇ is the gamma value of the OLED display panel
  • Step 6 the OLED display panel displays the currently calculated compensation gray scale, and determines whether The condition for reaching the preset end compensation gray scale calculation
  • the brightness acquiring device is a CCD
  • the target brightness preset by each sub-pixel is obtained by a gamma curve corresponding to the gamma value of the OLED display panel.
  • the present invention provides a method for eliminating an OLED display panel Mura by first selecting a corresponding calculation formula by comparing a gamma value of an OLED display panel with a local gamma value of a currently displayed gray scale, The target brightness, the actual brightness, the current display gray level, and the gamma value of the OLED display panel of each sub-pixel are calculated to obtain the compensation gray scale, or according to the target brightness, the actual brightness under the 255 gray level, and the current display gray. The local gamma value of the order is calculated to obtain the compensation gray scale, and then the OLED display panel displays the current calculated compensation gray scale, and determines whether the preset end compensation gray scale calculation condition is reached.
  • the compensation gray scale is continuously iteratively calculated until the preset end compensation gray scale calculation condition is reached, and the present invention passes the plurality of times compared to the prior art. Compensation obtained by calculation enables generation of grayscale luminance of the sub-pixel luminance is closer to the target sub-pixel, can be quickly and efficiently eliminate Mura OLED display panel, to ensure uniform brightness of the OLED display panel, to enhance the display quality of the OLED display panel.
  • FIG. 1 is a flow chart of a method for eliminating an OLED display panel Mura of the present invention
  • FIG. 2 is an operational logic diagram of a method for eliminating an OLED display panel Mura according to the present invention
  • FIG. 3 is a schematic diagram of the method for eliminating the OLED display panel Mura of the present invention by iteratively calculating the compensated brightness to be close to the target brightness.
  • the present invention provides a method for eliminating an OLED display panel Mura, comprising the following steps:
  • Step 1 providing an OLED display panel and a brightness acquiring device, so that the OLED display panel displays 255 gray scales, and the brightness obtaining device obtains the actual brightness of each sub-pixel of the OLED display panel at 255 gray scales;
  • the brightness acquisition device may select a luminance meter or a CCD.
  • Step 2 causing the OLED display panel to display the gray scale to be compensated.
  • Step 3 Obtain the actual brightness of each sub-pixel of the OLED display panel under the current display gray scale by using the brightness acquiring device.
  • step 3 taking a photo of a display screen of the OLED display panel under the current gray scale by the CCD to obtain the actual brightness of each sub-pixel of the OLED display panel under the current display gray scale.
  • the CCD taking a photo of a display screen of the OLED display panel under the current gray scale by the CCD to obtain the actual brightness of each sub-pixel of the OLED display panel under the current display gray scale.
  • Step 4 Calculate the local gamma value under the current gray scale, and calculate the formula as follows:
  • i is an integer greater than or equal to 0
  • i+1 is the number of times the current iteration is calculated
  • Gamma i is the local gamma value under the currently displayed grayscale
  • L i is the actual luminance of the subpixel under the current grayscale display
  • L 255 For the actual brightness of the sub-pixels under 255 grayscale
  • Gray i is the currently displayed grayscale.
  • Step 5 Obtain a gamma value of the OLED display panel and a target brightness preset by each sub-pixel, and select a corresponding calculation formula by comparing a gamma value of the OLED display panel with a local gamma value of the currently displayed gray scale to calculate Obtain the compensation gray scale that should be used to achieve the target brightness preset by the sub-pixel.
  • the specific calculation formula and applicable conditions are:
  • the compensation gray scale to be used is calculated according to the following formula (1);
  • L goal is the target brightness of the sub-pixel
  • Gray i+1 is the compensation gray level
  • the compensation gray scale to be used is calculated according to the following formula (2);
  • ⁇ is the gamma value of the OLED display panel.
  • the compensation gray scale to be used is calculated by comparing the gamma value of the OLED display panel with the local gamma value under the current gray scale and then selecting the formula (1) or the formula (2).
  • the formula (2) is selected to calculate the compensation gray scale to enhance the compensation effect, and the gamma value fluctuation of the sub-pixel is prevented from affecting the compensation effect.
  • the local gamma value of the current gray scale is greatly different from the gamma value of the OLED display panel, the local gamma value under the current display gray scale obtained by real-time iterative calculation is used to calculate the compensation gray to be used.
  • Step avoiding that the actual gamma value of the factor pixel is too large from the gamma value of the OLED display panel (greater than twice the gamma value of the OLED display panel), causing the actual brightness of the sub-pixel to diverge during the iterative process, away from the target brightness Further and farther, through the combined use of the two calculation methods, while allowing the gamma value of the sub-pixel to fluctuate in different gray levels, it is also possible to avoid the actual brightness of the sub-pixel from oscillating during the compensation process.
  • the compensation gray scale calculation formula is: or By analogy until the end of the calculation of the compensation gray scale, that is, using the result of the previous calculation as the parameter of the latter calculation, the next calculation is performed, and an iterative operation is formed.
  • Step 6 The OLED display panel displays the currently calculated compensation gray scale, and determines whether the preset end compensation gray scale calculation condition is reached;
  • condition for ending the gray scale calculation in the step 6 may be: the difference between the actual brightness of the sub-pixel and the target brightness is less than the preset deviation brightness, that is, the OLED display panel displaying the current gray level reaches the expected display. effect;
  • the condition for ending the compensation gray scale calculation in the step 6 may also be: the number of times the current iteration calculation reaches the preset maximum iteration calculation;
  • the condition for ending the gray scale calculation in the step 6 may also be: the difference between the actual brightness of the sub-pixel and the target brightness is less than the preset error brightness or the number of times the current iteration calculation reaches the preset maximum iteration calculation, any When one of them is reached, the calculation of the compensation gray scale is ended.
  • the preset maximum iteration calculation is three times.
  • the present invention is further illustrated by a specific example of the method for eliminating the OLED display panel Mura of the present invention.
  • a target pixel in the OLED display panel has a target luminance L goal of 20 nits at a gray level of 160 nm.
  • the actual brightness obtained by the obtaining device is 10.41 nits
  • the actual brightness of the 255 gray level is 55.76 nits
  • the gamma value of the OLED display panel is 2.2, wherein the target brightness passes through the gamma corresponding to the gamma value 2.2 of the OLED display panel.
  • the horse curve is obtained, and the actual gamma value of the sub-pixel is not the same as the gamma value of the OLED display panel, assuming that the actual gamma value of the gray level of 128 is 3.0, and the actual gamma value of the gray level of 224 is 4.8, and The actual gamma value varies approximately linearly from 128 gray scale to 224 gray scale (the actual gamma value of the sub-pixel does not need to be obtained for the specific calculation, and is only used for comparison here).
  • the corresponding gamma curve is also If they do not coincide, then the first iteration calculation is performed according to the above known conditions using the calculation formula of the present invention to obtain a compensation gray scale:
  • the actual luminance of the sub-pixel at 215 gray scale is 25.30 nits (the data is located on the actual gamma curve of the sub-pixel);
  • the actual luminance of the sub-pixel is obtained by using the actual gamma value, and in actual operation, the OLED display panel displays the currently calculated compensation gray scale 215, the actual gamma of the factor pixel.
  • the horse value is unknown, and the actual brightness of the sub-pixels of 215 gray scale is obtained by a brightness acquiring device such as a CCD camera of 25.30 nits.
  • the OLED display panel displays the currently calculated compensation gray scale 204, and obtains the actual luminance of the sub-pixel under the gray scale by the luminance acquiring device to be 20.77 nits, that is, the sub-pixel of the gray-scale sub-pixel on the actual gamma curve of the sub-pixel.
  • the actual brightness is 20.77 nits; compared to the first iteration calculation, the compensated gray level obtained by the second iteration makes the actual brightness corresponding to the sub-pixel closer to the target brightness.
  • the OLED display panel displays the currently calculated compensation gray scale 202, and obtains the actual luminance of the sub-pixel under the gray scale by the luminance acquiring device to be 20.06 nits, that is, the sub-pixel of the gray scale under the actual gamma curve of the sub-pixel.
  • the actual brightness is 20.06 nits; compared to the second iteration calculation, the compensated gray level obtained by the third iteration makes the actual brightness corresponding to the sub-pixel closer to the target brightness.
  • the brightness of the sub-pixel will be closer to the target brightness, thereby achieving a uniform display effect. It can be seen that through multiple iteration calculations, the actual brightness of the sub-pixel can be made closer to the target brightness, which effectively overcomes the problem of poor compensation effect caused by the actual gamma value abnormality of the Mura region in the prior art, and can effectively eliminate the problem.
  • the OLED display panel Mura ensures uniform brightness of the OLED display panel and improves the display quality of the OLED display panel.
  • the present invention provides a method for eliminating the OLED display panel Mura by first selecting a corresponding calculation formula by comparing the gamma value of the OLED display panel with the local gamma value of the currently displayed gray scale, according to each The target brightness of the sub-pixel, the actual brightness, the current display gray level, and the gamma value of the OLED display panel calculate the compensation gray level to be used, or according to the target brightness, the actual brightness under the 255 gray level, and the current display gray level.
  • the local gamma value is calculated to calculate the compensation gray scale, and then the OLED display panel displays the current calculated compensation gray scale, and determines whether the preset end compensation gray scale calculation condition is reached, if the preset is not reached.

Abstract

一种消除OLED显示面板Mura的方法，先通过对比OLED显示面板的伽马值和当前显示灰阶下的局域伽马值选择相应的计算公式，以计算得出应采用的补偿灰阶，再令OLED显示面板显示当前得到的补偿灰阶，并判断是否达到预设的结束补偿灰阶计算的条件，若没有达到预设的结束补偿灰阶计算的条件，则不断进行迭代计算直至达到预设的结束补偿灰阶计算的条件，该方法能够快捷有效地消除OLED显示面板Mura，保证OLED显示面板的亮度均匀，提升OLED显示面板的显示品质。

Description

消除OLED显示面板Mura的方法 技术领域
本发明涉及显示技术领域，尤其涉及一种消除OLED显示面板Mura的方法。
背景技术
平面显示器件具有机身薄、省电、无辐射等众多优点，得到了广泛的应用。现有的平面显示器件主要包括液晶显示器件(Liquid Crystal Display，LCD)及有机发光二极管显示器件(Organic Light Emitting Display，OLED)。
有机发光二极管显示器件由于同时具备自发光，不需背光源、对比度高、厚度薄、视角广、反应速度快、可用于挠曲性面板、使用温度范围广、构造及制程较简单等优异特性，被认为是下一代平面显示器的新兴应用技术。
OLED显示装置通常包括：基板、设于基板上的阳极、设于阳极上的有机发光层，设于有机发光层上的电子传输层、及设于电子传输层上的阴极。工作时向有机发光层发射来自阳极的空穴和来自阴极的电子，将这些电子和空穴组合产生激发性电子-空穴对，并将激发性电子-空穴对从受激态转换为基态实现发光。
目前在平面显示面板生产过程中由于生产工艺等原因经常会产生Mura(亮度不均匀)，出现亮点或暗点，导致面板的显示品质降低。Demura技术是一种消除显示器Mura，使画面亮度均匀的技术。Demura技术的基本原理是，让面板显示灰阶画面，用电容耦合器件(Charge Coupled Device，CCD)拍摄屏幕，获取面板中各像素点的亮度值，然后调整Mura区域的像素点的灰阶值或者电压，使过暗的区域变亮、过亮的区域变暗，达到均匀的显示效果。
在实际生产中应用Demura技术时，不仅要求显示效果好，还要求耗时短。这就需要良好且实用的Demura算法。现有技术采用的Demura算法通常是根据伽马(Gamma)值和目标亮度来推算修正后的灰阶值，如专利文件CN201310695713.X所公开的一种消除液晶显示器mura的方法，具体步骤为：首先获取各个像素点的亮度值，再根据亮度修正系数修正各个像素点的亮度值，然后根据各个像素点的修正后的亮度值以及伽马指数，计算得到输入图像对应的每个像素点的修正后的灰阶值，具体计算公 式:
Figure PCTCN2016080327-appb-000001
其中L1为修正后的亮度值，X1为修正后的灰阶值，Y表示伽马指数。
在OLED显示面板中，各个像素点特别是Mura区域的伽马曲线的偏差很大，根据统一的伽马值或伽马曲线做单次推算，不能达到预期补偿效果，因此现有的Demura算法并不适用于OLED显示面板。
发明内容
本发明的目的在于一种消除OLED显示面板Mura的方法，能够快捷有效地消除OLED显示面板Mura，保证OLED显示面板的亮度均匀，提升OLED显示面板的显示品质。
为实现上述目的，本发明提供了一种消除OLED显示面板Mura的方法，包括如下步骤：
步骤1、提供一OLED显示面板和一亮度获取装置，令OLED显示面板显示255灰阶，用亮度获取装置获取OLED显示面板在255灰阶下各子像素的实际亮度；
步骤2、令OLED显示面板显示待补偿的灰阶；
步骤3、用亮度获取装置获取OLED显示面板在当前显示灰阶下各子像素的实际亮度；
步骤4、计算当前显示灰阶下的局域伽马值，计算公式如下：
Figure PCTCN2016080327-appb-000002
其中，i为大于等于0的整数，i+1为当前迭代计算的次数，Gammai为当前显示灰阶下的局域伽马值，Li为当前显示灰阶下子像素的实际亮度，L255为255灰阶下子像素的实际亮度，Grayi为当前显示灰阶；
步骤5、获取OLED显示面板的伽马值和各子像素预设的目标亮度，通过对比OLED显示面板的伽马值和当前显示灰阶下的局域伽马值选择相应的计算公式，以计算获得为达到子像素预设的目标亮度应采用的补偿灰阶，具体的计算公式及适用条件为：
若当前显示灰阶下的局域伽马值大于OLED显示面板的伽马值的两倍，则根据下述公式(1)计算应采用的补偿灰阶；
Figure PCTCN2016080327-appb-000003
其中，Lgoal为子像素的目标亮度，Grayi+1为补偿灰阶；
若当前显示灰阶下的局域伽马值小于OLED显示面板的伽马值的两倍，则根据下述公式(2)计算应采用的补偿灰阶；
Figure PCTCN2016080327-appb-000004
其中，γ为OLED显示面板的伽马值；
步骤6、令OLED显示面板显示当前计算得到的补偿灰阶，判断是否达到预设的结束补偿灰阶计算的条件；
若未达到结束补偿灰阶计算的条件，则返回步骤3；
若达到结束补偿灰阶计算的条件，则结束。
所述亮度获取装置为亮度计。
所述亮度获取装置为CCD。
所述步骤3通过CCD拍摄一张OLED显示面板在当前显示灰阶下的显示画面的照片来获取OLED显示面板在当前显示灰阶下各子像素的实际亮度。
所述步骤6中结束补偿灰阶计算的条件为：子像素的实际亮度与目标亮度的差值小于预设的允许偏离亮度。
所述步骤6中结束补偿灰阶计算的条件为：当前迭代计算的次数达到预设的最大迭代计算的次数。
所述预设的最大迭代计算的次数为三次。
所述步骤6中结束补偿灰阶计算的条件为：子像素的实际亮度与目标亮度的差值小于预设的误差亮度或者当前迭代计算的次数达到预设的最大迭代计算的次数。
所述步骤5中，各子像素预设的目标亮度通过与所述OLED显示面板的伽马值相对应的伽马曲线得到。
本发明还提供一种消除OLED显示面板Mura的方法，包括如下步骤：
步骤1、提供一OLED显示面板和一亮度获取装置，令OLED显示面 板显示255灰阶，用亮度获取装置获取OLED显示面板在255灰阶下各子像素的实际亮度；
步骤2、令OLED显示面板显示待补偿的灰阶；
步骤3、用亮度获取装置获取OLED显示面板在当前显示灰阶下各子像素的实际亮度；
步骤4、计算当前显示灰阶下的局域伽马值，计算公式如下：
Figure PCTCN2016080327-appb-000005
其中，i为大于等于0的整数，i+1为当前迭代计算的次数，Gammai为当前显示灰阶下的局域伽马值，Li为当前显示灰阶下子像素的实际亮度，L255为255灰阶下子像素的实际亮度，Grayi为当前显示灰阶；
步骤5、获取OLED显示面板的伽马值和各子像素预设的目标亮度，通过对比OLED显示面板的伽马值和当前显示灰阶下的局域伽马值选择相应的计算公式，以计算获得为达到子像素预设的目标亮度应采用的补偿灰阶，具体的计算公式及适用条件为：
若当前显示灰阶下的局域伽马值大于OLED显示面板的伽马值的两倍，则根据下述公式计算应采用的补偿灰阶；
Figure PCTCN2016080327-appb-000006
其中，Lgoal为子像素的目标亮度，Grayi+1为补偿灰阶；
若当前显示灰阶下的局域伽马值小于OLED显示面板的伽马值的两倍，则根据下述公式计算应采用的补偿灰阶；
Figure PCTCN2016080327-appb-000007
其中，γ为OLED显示面板的伽马值；
步骤6、令OLED显示面板显示当前计算得到的补偿灰阶，判断是否 达到预设的结束补偿灰阶计算的条件；
若未达到结束补偿灰阶计算的条件，则返回步骤3；
若达到结束补偿灰阶计算的条件，则结束；
其中，所述亮度获取装置为CCD；
其中，所述步骤5中，各子像素预设的目标亮度通过与所述OLED显示面板的伽马值相对应的伽马曲线得到。
本发明的有益效果：本发明提供了一种消除OLED显示面板Mura的方法，先通过对比OLED显示面板的伽马值和当前显示灰阶下的局域伽马值选择相应的计算公式，以根据各个子像素的目标亮度、实际亮度、当前显示灰阶、及OLED显示面板的伽马值计算得出应采用的补偿灰阶，或者根据目标亮度、255灰阶下的实际亮度、及当前显示灰阶下的局域伽马值计算得出应采用的补偿灰阶，再令OLED显示面板显示当前计算得到补偿灰阶，并判断是否达到预设的结束补偿灰阶计算的条件，若没有达到预设的结束补偿灰阶计算的条件，则获取该灰阶下子像素的实际亮度，再次计算得到当前显示灰阶下的局域伽马值并通过比对选择相应的计算公式计算获得下一个应采用的补偿灰阶，不断进行迭代计算直至达到预设的结束补偿灰阶计算的条件，相比于现有技术，本发明通过多次迭代计算获得的补偿灰阶能使子像素的亮度更接近子像素的目标亮度，能够快捷有效地消除OLED显示面板Mura，保证OLED显示面板的亮度均匀，提升OLED显示面板的显示品质。
附图说明
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图中，
图1为本发明的消除OLED显示面板Mura的方法的流程图；
图2为本发明的消除OLED显示面板Mura的方法的运算逻辑图；
图3为本发明的消除OLED显示面板Mura的方法通过迭代计算使得到的补偿亮度接近目标亮度的示意图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图1并结合图2，本发明提供了一种消除OLED显示面板Mura的方法，包括如下步骤：
步骤1、提供一OLED显示面板和一亮度获取装置，令OLED显示面板显示255灰阶，用亮度获取装置获取OLED显示面板在255灰阶下各子像素的实际亮度；
具体地，所述亮度获取装置可选择亮度计或CCD。
步骤2、令OLED显示面板显示待补偿的灰阶。
步骤3、用亮度获取装置获取OLED显示面板在当前显示灰阶下各子像素的实际亮度。
具体地，以CCD为例，所述步骤3中，通过CCD拍摄一张OLED显示面板在当前显示灰阶下的显示画面的照片来获取OLED显示面板在当前显示灰阶下各子像素的实际亮度，每获取一次各子像素的实际亮度仅需要拍摄一张照片，可简化操作简单，从而可加快补偿灰阶的运算速度。
步骤4、计算当前显示灰阶下的局域伽马值，计算公式如下：
Figure PCTCN2016080327-appb-000008
其中，i为大于等于0的整数，i+1为当前迭代计算的次数，Gammai为当前显示灰阶下的局域伽马值，Li为当前显示灰阶下子像素的实际亮度，L255为255灰阶下子像素的实际亮度，Grayi为当前显示灰阶。
步骤5、获取OLED显示面板的伽马值和各子像素预设的目标亮度，通过对比OLED显示面板的伽马值和当前显示灰阶下的局域伽马值选择相应的计算公式，以计算获得为达到子像素预设的目标亮度应采用的补偿灰阶，具体的计算公式及适用条件为：
若当前显示灰阶下的局域伽马值大于OLED显示面板的伽马值的两倍，则根据下述公式(1)计算应采用的补偿灰阶；
Figure PCTCN2016080327-appb-000009
其中，Lgoal为子像素的目标亮度，Grayi+1为补偿灰阶；
若当前显示灰阶下的局域伽马值小于OLED显示面板的伽马值的两倍，则根据下述公式(2)计算应采用的补偿灰阶；
Figure PCTCN2016080327-appb-000010
其中，γ为OLED显示面板的伽马值。
特别地，通过对比OLED显示面板的伽马值和当前显示灰阶下的局域伽马值之后再选择公式(1)、或公式(2)来计算应采用的补偿灰阶，在当前显示灰阶下的局域伽马值与OLED显示面板的伽马值偏差较小时，选择公式(2)计算应采用的补偿灰阶，以加强补偿效果，防止子像素的伽马值波动影响补偿效果，在当前显示灰阶下的局域伽马值与OLED显示面板的伽马值偏差较大时，采用实时迭代计算得到的当前显示灰阶下的局域伽马值来计算得到应采用的补偿灰阶，避免因子像素的实际伽马值与OLED显示面板的伽马值偏差过大(大于OLED显示面板的伽马值的两倍)而造成子像素的实际亮度在迭代过程中发散，离目标亮度越来越远的情况，通过两种计算方法的综合使用，在允许子像素的伽马值在不同灰阶的波动的同时，还可以避免子像素的实际亮度在补偿过程中出现震荡。
具体地，第一次迭代运算时i＝0，对应的局域伽马值计算公式为：
Figure PCTCN2016080327-appb-000011
补偿灰阶计算公式为：
Figure PCTCN2016080327-appb-000012
或者
Figure PCTCN2016080327-appb-000013
其中Gray0为待补偿的灰阶，L0为待补偿的灰阶下子像素的实际亮度；第二次迭代运算时i＝1，对应的局域伽马值计算公式为：
Figure PCTCN2016080327-appb-000014
补偿灰阶计算公式为：
Figure PCTCN2016080327-appb-000015
或者
Figure PCTCN2016080327-appb-000016
第三次迭代运算 时i＝2，对应的局域伽马值计算公式为：
Figure PCTCN2016080327-appb-000017
补偿灰阶计算公式为：
Figure PCTCN2016080327-appb-000018
或者
Figure PCTCN2016080327-appb-000019
依次类推直至结束补偿灰阶的计算，也即利用前一次计算的结果作为后一次计算的参数代入后一次计算，形成迭代运算。
步骤6、令OLED显示面板显示当前计算得到的补偿灰阶，判断是否达到预设的结束补偿灰阶计算的条件；
若未达到结束补偿灰阶计算的条件，则返回步骤2；
若达到结束补偿灰阶计算的条件，则结束。
具体地，所述步骤6中结束补偿灰阶计算的条件可以为：子像素的实际亮度与目标亮度的差值小于预设的许偏离亮度，即显示当前灰阶的OLED显示面板达到了预期显示效果；
所述步骤6中结束补偿灰阶计算的条件还可以为：当前迭代计算的次数达到预设的最大迭代计算的次数；
所述步骤6中结束补偿灰阶计算的条件也可以为：子像素的实际亮度与目标亮度的差值小于预设的误差亮度或者当前迭代计算的次数达到预设的最大迭代计算的次数，任意达到其中一条则结束补偿灰阶的计算。
优选地，所述预设的最大迭代计算的次数为三次。
下面通过本发明的消除OLED显示面板Mura的方法的一具体实例对本发明进行进一步说明，如图3所示，假定OLED显示面板中某子像素在160灰阶的目标亮度Lgoal为20nits，而亮度获取装置得到的实际亮度为10.41nits，255灰阶的实际亮度为55.76nits，OLED显示面板的伽马值为2.2，其中，目标亮度通过与所述OLED显示面板的伽马值2.2相对应的伽马曲线得到，而子像素的实际伽马值与OLED显示面板的伽马值并不相同，假设在128灰阶的实际伽马值为3.0，在224灰阶的实际伽马值为4.8，且实际伽马值在128灰阶至224灰阶间近似线性变化(具体计算时无需获得子像素的实际伽马值，此处仅作对比说明使用)，此时，两者相应的伽马曲线也并不重合，那么根据上述已知条件利用本发明的计算公式进行第一次迭 代计算获得一补偿灰阶：
Figure PCTCN2016080327-appb-000020
则选择公式(2)计算应采用的补偿灰阶：
Figure PCTCN2016080327-appb-000021
根据子像素的实际伽马值可得，在215灰阶下子像素的实际亮度为25.30nits(该数据位于子像素的实际伽马曲线上)；
需要说明的是，此处为说明本发明的效果而使用实际伽马值获取子像素的实际亮度，而实际操作时，令OLED显示面板显示当前计算得到的补偿灰阶215，因子像素的实际伽马值未知，通过亮度获取装置如CCD相机获取215灰阶下子像素的实际亮度25.30nits。
随后，进行第二次迭代计算又获得一补偿灰阶：
Figure PCTCN2016080327-appb-000022
则选择公式(1)计算应采用的补偿灰阶：
Figure PCTCN2016080327-appb-000023
令OLED显示面板显示当前计算得到的补偿灰阶204，并通过亮度获取装置得到子像素在该灰阶下的实际亮度为20.77nits，也即在子像素的实际伽马曲线上204灰阶下子像素的实际亮度为20.77nits；对比第一次迭代计算，第二迭代计算的得到的补偿灰阶使子像素对应的实际亮度更接近目标亮度
接着，进行第三次迭代计算又获得一补偿灰阶：
Figure PCTCN2016080327-appb-000024
选择公式(1)计算应采用的补偿灰阶：
Figure PCTCN2016080327-appb-000025
令OLED显示面板显示当前计算得到的补偿灰阶202，并通过亮度获取装置得到子像素在该灰阶下的实际亮度为20.06nits，也即在子像素的实际伽马曲线上202灰阶下子像素的实际亮度为20.06nits；对比第二次迭代计算，第三迭代计算的得到的补偿灰阶使子像素对应的实际亮度更接近目标亮度。
即由图3可以看出，每经过1次迭代后，子像素的亮度会更趋近于目标亮度，从而达到均匀的显示效果。可见，通过多次迭代计算，可使得子像素的实际亮度越来越趋近于目标亮度，有效克服现有技术因Mura区域的实际伽马值异常造成的补偿效果不佳的问题，能够有效消除OLED显示面板Mura，保证OLED显示面板的亮度均匀，提升OLED显示面板的显示品质。
综上所述，本发明提供了一种消除OLED显示面板Mura的方法，先通过对比OLED显示面板的伽马值和当前显示灰阶下的局域伽马值选择相应的计算公式，以根据各个子像素的目标亮度、实际亮度、当前显示灰阶、及OLED显示面板的伽马值计算得出应采用的补偿灰阶，或者根据目标亮度、255灰阶下的实际亮度、及当前显示灰阶下的局域伽马值计算得出应采用的补偿灰阶，再令OLED显示面板显示当前计算得到补偿灰阶，并判断是否达到预设的结束补偿灰阶计算的条件，若没有达到预设的结束补偿灰阶计算的条件，则获取该灰阶下子像素的实际亮度，再次计算得到当前显示灰阶下的局域伽马值并比对选择相应的计算公式计算获得下一个应采用的补偿灰阶，不断进行迭代计算直至达到预设的结束补偿灰阶计算的条件，相比于现有技术，本发明通过多次迭代计算获得的补偿灰阶能使子像素的亮度更接近目标亮度，能够快捷有效地消除OLED显示面板Mura，保证OLED显示面板的亮度均匀，提升OLED显示面板的显示品质。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明权利要求的保护范围。

Claims (15)

  1. 一种消除OLED显示面板Mura的方法，包括如下步骤：
    步骤1、提供一OLED显示面板和一亮度获取装置，令OLED显示面板显示255灰阶，用亮度获取装置获取OLED显示面板在255灰阶下各子像素的实际亮度；
    步骤2、令OLED显示面板显示待补偿的灰阶；
    步骤3、用亮度获取装置获取OLED显示面板在当前显示灰阶下各子像素的实际亮度；
    步骤4、计算当前显示灰阶下的局域伽马值，计算公式如下：
    Figure PCTCN2016080327-appb-100001
    其中，i为大于等于0的整数，i+1为当前迭代计算的次数，Gammai为当前显示灰阶下的局域伽马值，Li为当前显示灰阶下子像素的实际亮度，L255为255灰阶下子像素的实际亮度，Grayi为当前显示灰阶；
    步骤5、获取OLED显示面板的伽马值和各子像素预设的目标亮度，通过对比OLED显示面板的伽马值和当前显示灰阶下的局域伽马值选择相应的计算公式，以计算获得为达到子像素预设的目标亮度应采用的补偿灰阶，具体的计算公式及适用条件为：
    若当前显示灰阶下的局域伽马值大于OLED显示面板的伽马值的两倍，则根据下述公式计算应采用的补偿灰阶；
    Figure PCTCN2016080327-appb-100002
    其中，Lgoal为子像素的目标亮度，Grayi+1为补偿灰阶；
    若当前显示灰阶下的局域伽马值小于OLED显示面板的伽马值的两倍，则根据下述公式计算应采用的补偿灰阶；
    Figure PCTCN2016080327-appb-100003
    其中，γ为OLED显示面板的伽马值；
    步骤6、令OLED显示面板显示当前计算得到的补偿灰阶，判断是否达到预设的结束补偿灰阶计算的条件；
    若未达到结束补偿灰阶计算的条件，则返回步骤3；
    若达到结束补偿灰阶计算的条件，则结束。
  2. 如权利要求1所述的消除OLED显示面板Mura的方法，其中，所述亮度获取装置为亮度计。
  3. 如权利要求1所述的消除OLED显示面板Mura的方法，其中，所述亮度获取装置为CCD。
  4. 如权利要求3所述的消除OLED显示面板Mura的方法，其中，所述步骤3中，通过CCD拍摄一张OLED显示面板在当前显示灰阶下的显示画面的照片来获取OLED显示面板在当前显示灰阶下各子像素的实际亮度。
  5. 如权利要求1所述的消除OLED显示面板Mura的方法，其中，所述步骤6中结束补偿灰阶计算的条件为：子像素的实际亮度与目标亮度的差值小于预设的允许偏离亮度。
  6. 如权利要求1所述的消除OLED显示面板Mura的方法，其中，所述步骤6中结束补偿灰阶计算的条件为：当前迭代计算的次数达到预设的最大迭代计算的次数。
  7. 如权利要求6所述的消除OLED显示面板Mura的方法，其中，所述预设的最大迭代计算的次数为三次。
  8. 如权利要求1所述的消除OLED显示面板Mura的方法，其中，所述步骤6中结束补偿灰阶计算的条件为：子像素的实际亮度与目标亮度的差值小于预设的误差亮度或者当前迭代计算的次数达到预设的最大迭代计算的次数。
  9. 如权利要求1所述的消除OLED显示面板Mura的方法，其中，所述步骤5中，各子像素预设的目标亮度通过与所述OLED显示面板的伽马值相对应的伽马曲线得到。
  10. 一种消除OLED显示面板Mura的方法，包括如下步骤：
    步骤1、提供一OLED显示面板和一亮度获取装置，令OLED显示面板显示255灰阶，用亮度获取装置获取OLED显示面板在255灰阶下各子 像素的实际亮度；
    步骤2、令OLED显示面板显示待补偿的灰阶；
    步骤3、用亮度获取装置获取OLED显示面板在当前显示灰阶下各子像素的实际亮度；
    步骤4、计算当前显示灰阶下的局域伽马值，计算公式如下：
    Figure PCTCN2016080327-appb-100004
    其中，i为大于等于0的整数，i+1为当前迭代计算的次数，Gammai为当前显示灰阶下的局域伽马值，Li为当前显示灰阶下子像素的实际亮度，L255为255灰阶下子像素的实际亮度，Grayi为当前显示灰阶；
    步骤5、获取OLED显示面板的伽马值和各子像素预设的目标亮度，通过对比OLED显示面板的伽马值和当前显示灰阶下的局域伽马值选择相应的计算公式，以计算获得为达到子像素预设的目标亮度应采用的补偿灰阶，具体的计算公式及适用条件为：
    若当前显示灰阶下的局域伽马值大于OLED显示面板的伽马值的两倍，则根据下述公式计算应采用的补偿灰阶；
    Figure PCTCN2016080327-appb-100005
    其中，Lgoal为子像素的目标亮度，Grayi+1为补偿灰阶；
    若当前显示灰阶下的局域伽马值小于OLED显示面板的伽马值的两倍，则根据下述公式计算应采用的补偿灰阶；
    Figure PCTCN2016080327-appb-100006
    其中，γ为OLED显示面板的伽马值；
    步骤6、令OLED显示面板显示当前计算得到的补偿灰阶，判断是否达到预设的结束补偿灰阶计算的条件；
    若未达到结束补偿灰阶计算的条件，则返回步骤3；
    若达到结束补偿灰阶计算的条件，则结束；
    其中，所述亮度获取装置为CCD；
    其中，所述步骤5中，各子像素预设的目标亮度通过与所述OLED显示面板的伽马值相对应的伽马曲线得到。
  11. 如权利要求10所述的消除OLED显示面板Mura的方法，其中，所述步骤3中，通过CCD拍摄一张OLED显示面板在当前显示灰阶下的显示画面的照片来获取OLED显示面板在当前显示灰阶下各子像素的实际亮度。
  12. 如权利要求10所述的消除OLED显示面板Mura的方法，其中，所述步骤6中结束补偿灰阶计算的条件为：子像素的实际亮度与目标亮度的差值小于预设的允许偏离亮度。
  13. 如权利要求10所述的消除OLED显示面板Mura的方法，其中，所述步骤6中结束补偿灰阶计算的条件为：当前迭代计算的次数达到预设的最大迭代计算的次数。
  14. 如权利要求13所述的消除OLED显示面板Mura的方法，其中，所述预设的最大迭代计算的次数为三次。
  15. 如权利要求10所述的消除OLED显示面板Mura的方法，其中，所述步骤6中结束补偿灰阶计算的条件为：子像素的实际亮度与目标亮度的差值小于预设的误差亮度或者当前迭代计算的次数达到预设的最大迭代计算的次数。
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