WO2020024422A1 - Mura补偿方法 - Google Patents
Mura补偿方法 Download PDFInfo
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- WO2020024422A1 WO2020024422A1 PCT/CN2018/108572 CN2018108572W WO2020024422A1 WO 2020024422 A1 WO2020024422 A1 WO 2020024422A1 CN 2018108572 W CN2018108572 W CN 2018108572W WO 2020024422 A1 WO2020024422 A1 WO 2020024422A1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
Definitions
- the present invention relates to the field of display technology, and in particular, to a Mura compensation method.
- the flat panel display device has many advantages such as a thin body, power saving, and no radiation, and has been widely used.
- Existing flat panel display devices mainly include liquid crystal display devices (Liquid Crystal Display, LCD) and organic light emitting diode display devices (Organic Light-Emitting Display, OLED).
- the brightness of the pixels can be corrected by grayscale compensation at this time, thereby improving the Mura phenomenon.
- the gray level compensation is to improve the uniformity of brightness by changing the gray level of the pixel: that is, the Mura condition of the gray level picture taken by the camera, and the input image is a single gray level picture (theoretically, the brightness transmitted by all pixels is the same ),
- the grayscale compensation value increased brightness
- reduce a certain grayscale compensation value decreased brightness
- the display brightness is relatively high
- the original gray level of a pixel is reduced by a certain compensation value.
- the original gray level is increased by a certain compensation value, so that the brightness of each pixel after the gray level compensation is nearly consistent, and the Mura phenomenon is improved.
- the current Demura technology has a certain compensation range N, which means that for Mura pixels, a maximum of N (N is a natural number) grayscale compensation values can be increased or decreased for compensation. If it exceeds the compensation range, it cannot be compensated, so It will cause part of the panel to fail (NG) and cannot be compensated completely.
- an object of the present invention is to provide a Mura compensation method to increase the Mura compensation range.
- the present invention provides a Mura compensation method, including:
- Step 10 Obtain a first image of the display panel under a preset gray level S0 through a camera;
- Step 20 Use the preset gray level S0 as a reference to obtain an initial Mura compensation value M0 of each Mura pixel on the display panel according to the first image;
- Step 30 Preset the grayscale compensation range as N, and N is a natural number, and determine whether the initial Mura compensation value M0 of each Mura pixel satisfies -N ⁇ M0 ⁇ N;
- Step 40 If the initial Mura compensation value M0 of each Mura pixel satisfies -N ⁇ M0 ⁇ N, directly use the initial Mura compensation value M0 of each Mura pixel as the target Mura compensation value, and use the target Mura compensation value to Mura compensation is performed for each Mura pixel; otherwise, step 50 is performed;
- Step 50 Determine whether the maximum value M1 and the minimum value M2 in the initial Mura compensation value M0 of each Mura pixel satisfy M2> 0, N ⁇ M1 ⁇ 2N, or M1 ⁇ 0, -2N ⁇ M2 ⁇ -N;
- Step 60 If the maximum value M1 and the minimum value M2 of the initial Mura compensation values M0 of each Mura pixel satisfy M2> 0, N ⁇ M1 ⁇ 2N or M1 ⁇ 0, -2N ⁇ M2 ⁇ -N, then select first gray level S1, S1 is a first gray scale reference value to obtain a first compensated Mura M S1 of all pixels, and the first compensation value Mura M S1 are satisfied all of the pixels S1 ⁇ N -N ⁇ M , All pixels use the first Mura compensation value M S1 as the target Mura compensation value, and perform Mura compensation on all pixels according to the target Mura compensation value.
- Step 70 For the maximum value M1 and the minimum value M2 of the initial Mura compensation value M0 of each Mura pixel, when M1> 0 and M2 ⁇ 0, if M1 ⁇ M2 ⁇ 2N and M1 or
- step 70 the maximum value of the grayscale compensation value M of each Mura pixel is represented as M1, and the minimum value is represented as M2.
- Step 80 When there is only one Mura pixel, if the initial Mura compensation value M0 of the Mura pixel satisfies M0> 2N, the grayscale compensation values of the normal pixel and the Mura pixel are -N and N, respectively.
- Step 90 When there is only one Mura pixel, if the initial Mura compensation value M0 of the Mura pixel satisfies M0 ⁇ -2N, the grayscale compensation values of the normal pixel and the Mura pixel are N and -N, respectively.
- the display panel is an LCD display panel.
- the display panel is an OLED display panel.
- the Mura compensation method of the present invention can effectively extend the range of Mura compensation.
- FIG. 1 is a schematic diagram of a panel to be compensated in a preferred embodiment of the Mura compensation method of the present invention
- FIG. 2 is a schematic diagram of a rear panel of a compensation in a preferred embodiment of the Mura compensation method of the present invention
- FIG. 3 is a flowchart of a Mura compensation method according to the present invention.
- the Mura compensation method of the present invention can improve the existing Demura method, which not only compensates for Mura pixels, that is, light and dark change points, but also compensates for normal pixels, which can also be referred to as the base, and adjusts the compensation values on both sides. If the Mura pixel compensation range is limited to N gray levels, and the base compensation range is also limited to N gray levels, then the overall Demura compensation range will be increased to 2N gray levels, effectively increasing the compensation range.
- the Mura compensation method of the present invention mainly includes:
- Step 10 Obtain the first image of the display panel under the preset gray level S0 through the camera; that is, the display panel displays the image with the preset gray level S0, and the Mura condition of the image is captured by the camera.
- Step 20 Use the preset gray level S0 as a reference to obtain the initial Mura compensation value M0 of each Mura pixel on the display panel according to the first image; determine the normal pixels and Mura pixels in the gray level image, and The grayscale value of the normal pixel grayscale S0 determines the Mura compensation value M0 required for each Mura pixel.
- a lower grayscale value is applied to Mura pixels with higher display brightness, that is, the Mura compensation value M0 is negative.
- a higher grayscale value is applied, that is, the Mura compensation value M0 is positive, so that the brightness of each pixel after Mura compensation is close to consistent.
- Step 30 The grayscale compensation range is preset to N, and N is a natural number, and it is determined whether the initial Mura compensation value M0 of each Mura pixel satisfies -N ⁇ M0 ⁇ N; the purpose of the present invention is to increase the Mura compensation range, so the grayscale is preset.
- the compensation range is N.
- Mura pixels with higher display brightness can be subtracted from N gray scales during compensation.
- Mura pixels with lower display brightness can be added with N gray scales during compensation.
- the initial Mura compensation value M0 can be used.
- the initial Mura compensation value M0 can be a positive or negative integer. A positive value indicates that the brightness of Mura pixels is less than a normal pixel, and a negative value indicates that the brightness of Mura pixels is greater than Normal pixels.
- Step 40 If the initial Mura compensation value M0 of each Mura pixel satisfies -N ⁇ M0 ⁇ N, directly use the initial Mura compensation value M0 of each Mura pixel as the target Mura compensation value, and use the target Mura compensation value to Mura compensation is performed for each Mura pixel; otherwise, step 50 is performed; through this step, it can be determined that the grayscale value to be compensated is within the compensation range N, and the initial Mura compensation value M0 can be directly used to compensate the Mura pixels according to the existing compensation method. The brightness of all Mura pixels is compensated to be consistent with normal pixels, and each Mura pixel is compensated according to its initial Mura compensation value M0.
- Step 50 Determine whether the maximum value M1 and the minimum value M2 in the initial Mura compensation value M0 of each Mura pixel satisfy M2> 0, N ⁇ M1 ⁇ 2N, or M1 ⁇ 0, -2N ⁇ M2 ⁇ -N; The step compares the initial Mura compensation value M0 of each Mura pixel with N and 2N. This step determines whether each Mura pixel needs to be increased or all needs to be decreased by a certain Mura compensation value, and whether the Mura compensation value to be increased or decreased is required. Within N and 2N.
- Step 60 If the maximum value M1 and the minimum value M2 of the initial Mura compensation values M0 of each Mura pixel satisfy M2> 0, N ⁇ M1 ⁇ 2N or M1 ⁇ 0, -2N ⁇ M2 ⁇ -N, then select first gray level S1, S1 is a first gray scale reference value to obtain a first compensated Mura M S1 of all pixels, and the first compensation value Mura M S1 are satisfied all of the pixels S1 ⁇ N -N ⁇ M Using the first Mura compensation value M S1 of all pixels as the target Mura compensation value, and performing Mura compensation on all pixels according to the target Mura compensation value.
- the present invention reselects and presets the gray scales of normal pixels different gray S0 S1 as a first reference compensation Mura
- S1 is the first reference gray level of all pixels are obtained first compensation value M Mura S1
- the first compensation value Mura M are all the pixels S1 Satisfy -N ⁇ M S1 ⁇ N
- all pixels use the first Mura compensation value M S1 as the target Mura compensation value, and perform Mura compensation on all pixels according to the target Mura compensation value, so that normal pixels and Mura pixels
- the brightness of the points is compensated to the first gray level S1 to achieve uniform brightness.
- the compensation range is expanded by bidirectional compensation for normal pixels and Mura pixels.
- the first gray level S1 can be arbitrarily selected as long as the first Mura compensation values M S1 of all pixels satisfy
- the Mura compensation method of the present invention may further include: Step 70: For the maximum value M1 and the minimum value M2 of the initial Mura compensation value M0 of each Mura pixel, when M1> 0 and M2 ⁇ 0, if M1 ⁇ M2 ⁇ is satisfied 2N and M1 or
- step 70 is used to determine whether the compensation value required for each Mura pixel is increased or decreased, and when the required compensation value is increased or decreased, further comparison is performed between each Mura pixel to determine whether The maximum value of whether the increased compensation value is subtracted from the reduced compensation value (negative value) is within 2N, but the increase or decrease of the compensation value is larger than N in a single item.
- the present invention reselects a second gray level S2 different from the preset gray level S0 of the normal pixel as a reference for Mura compensation, and uses the second gray level S2 as a reference to obtain second Mura compensation values of all pixels, respectively.
- the second gray level S2 can be arbitrarily selected, as long as the second Mura compensation values M S2 of all pixels satisfy -N ⁇ M S2 ⁇ N.
- step 70 the maximum value of the grayscale compensation value M of each Mura pixel is represented as M1, and the minimum value is represented as M2.
- M1> 0 and M2 ⁇ 0 if M1 ⁇ M2 ⁇ 2N and M1> N are satisfied, That is, there are Mura pixels with brightness lower than the normal pixels, and the grayscale difference from the normal pixels is greater than N.
- all Mura pixels and normal pixels are compensated to be consistent with the brightness of the second gray level S2, that is, the gray levels of the normal pixels need to be reduced by M1-N, thereby expanding the compensation range.
- the Mura compensation method of the present invention may further include: Step 80: When there is only one Mura pixel, if the initial Mura compensation value M0 of the Mura pixel satisfies M0> 2N, the normal pixel and the gray scale of the Mura pixel The compensation values are -N and N, respectively.
- the Mura compensation method of the present invention may further include: Step 90. When there is only one Mura pixel, the initial Mura compensation value M0 of the Mura pixel satisfies M0 ⁇ -2N, then the normal pixel and the gray of the Mura pixel are gray. The order compensation values are N and -N, respectively.
- the Mura compensation method of the present invention can be applied to an LCD display panel or an OLED display panel.
- FIG. 1 and FIG. 2 are schematic diagrams of a panel to be compensated and a rear panel to be compensated in a preferred embodiment of the Mura compensation method of the present invention.
- the compensation value M is greater than N and less than 2N, then the normal pixel M-N gray scale is compensated on the one hand, and the Mura pixel N gray scale is compensated on the other hand. If the compensation value M exceeds 2N, there is really no way to compensate it completely. The best situation is that normal pixels compensate N gray levels and Mura pixels compensate N gray levels.
- the Mura compensation method of the present invention can effectively extend the range of Mura compensation, from 1 to 2 times.
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Abstract
一种Mura补偿方法，该Mura补偿方法包括：步骤10、获取显示面板在预设灰阶S0下的第一图像；步骤20、以预设灰阶S0为基准，得到显示面板上各个Mura像素点的初始Mura补偿值M0；步骤30、预设灰阶补偿范围为N，判断各个Mura像素点的初始Mura补偿值M0是否都满足﹣N≤M0≤N；步骤40、若都满足﹣N≤M0≤N，采用初始Mura补偿值M0作为目标Mura补偿值；否则执行步骤50；步骤50、判断初始Mura补偿值M0中的最大值M1和最小值M2是否满足M2＞0，N＜M1≤2N或者满足M1＜0，﹣2N≤M2＜﹣N；步骤60、若满足，则以第一灰阶S1为基准分别得到所有像素点的第一Mura补偿值M S1，采用所有像素点的第一Mura补偿值M S1作为目标Mura补偿值。根据所述Mura补偿方法可以有效的扩展Mura补偿的范围。
Description
本发明涉及显示技术领域，尤其涉及一种Mura补偿方法。
平板显示装置具有机身薄、省电、无辐射等众多优点，得到了广泛的应用。现有的平板显示装置主要包括液晶显示装置(Liquid Crystal Display，LCD)及有机发光二极管显示装置(Organic Light-Emitting Display，OLED)。
随着科技的发展及人们物质生活的需求，现今平板显示装置的尺寸做得越来越大，显示分辨率也越来越高，对生产工艺的要求也越来越严苛。由于生产工艺的原因，对于大尺寸显示面板来讲，例如TFT-LCD，很容易就遇到Mura(亮暗不均)的问题。目前针对此问题，一般是通过改善制程来解决，有部分无法完全改善的是通过Demura(亮暗不均补偿)技术来解决。
对于已经制作完成的显示面板(Panel)，其物理特性已经定型，为了弥补制程上的瑕疵而产生的Mura现象，此时可以通过灰阶补偿的方式来校正像素点的亮度，进而改善Mura现象。灰阶补偿是通过改变像素的灰阶来实现亮度均匀性的改善：即通过相机拍摄出灰阶画面的Mura状况，在输入图像为单一灰阶画面(理论上所有像素透过的亮度是相同的)，根据面板中心区域亮度，对偏暗区域的像素增加一定的灰阶补偿值(提高亮度)，对偏亮区域的像素减少一定的灰阶补偿值(降低亮度)；即对于显示亮度比较高的像素，原有灰阶减少一定的补偿值，对于显示亮度比较低的像素，原有灰阶增加一定的补偿值，使得灰阶补偿后各像素的亮度接近一致，实现Mura现象的改善。
但是目前的Demura技术都有一定的补偿范围N，也就是说对于Mura像素点可以增加或减少最多N(N为自然数)个灰阶补偿值来进行补偿，超过补偿范围的话就无法补偿，这样就会造成一部分面板不合格(NG)，无法补偿完全。
发明内容
因此，本发明的目的在于提供一种Mura补偿方法，增加Mura补偿范围。
为实现上述目的，本发明提供了一种Mura补偿方法，包括：
步骤10、通过相机获取显示面板在预设灰阶S0下的第一图像；
步骤20、以预设灰阶S0为基准，根据所述第一图像得到所述显示面板上各个Mura像素点的初始Mura补偿值M0；
步骤30、预设灰阶补偿范围为N，N为自然数，判断各个Mura像素点的初始Mura补偿值M0是否都满足﹣N≤M0≤N；
步骤40、若各个Mura像素点的初始Mura补偿值M0都满足﹣N≤M0≤N，则直接采用各个Mura像素点的初始Mura补偿值M0作为目标Mura补偿值，根据所述目标Mura补偿值对各个Mura像素点进行Mura补偿；否则执行步骤50；
步骤50、判断各个Mura像素点的初始Mura补偿值M0中的最大值M1和最小值M2是否满足M2＞0，N＜M1≤2N或者满足M1＜0，﹣2N≤M2＜﹣N；
步骤60、若各个Mura像素点的初始Mura补偿值M0中的最大值M1和最小值M2满足M2＞0，N＜M1≤2N或者满足M1＜0，﹣2N≤M2＜﹣N，则选定第一灰阶S1，以第一灰阶S1为基准分别得到所有像素点的第一Mura补偿值M
S1，且使所有像素点的第一Mura补偿值M
S1都满足﹣N≤M
S1≤N，所有像素点采用第一Mura补偿值M
S1作为目标Mura补偿值，根据所述目标Mura补偿值对所有像素点进行Mura补偿。
其中，还包括：
步骤70、对于各个Mura像素点的初始Mura补偿值M0中的最大值M1和最小值M2，当M1＞0，M2＜0时，若满足M1－M2≤2N且M1或|M2|＞N，则选定第二灰阶S2，以第二灰阶S2为基准分得到所有像素点的第二Mura补偿值M
S2，且使所有像素点的第二Mura补偿值M
S2都满足﹣N≤M
S2≤N，所有像素点采用第二Mura补偿值M
S2作为目标Mura补偿值，根据所述目标Mura补偿值对所有像素点进行Mura补偿。
其中，步骤60中，当仅有一个Mura像素点时，对于该Mura像素点，初始Mura补偿值M0＝M1＝M2，若满足N＜M0≤2N，则第一灰阶S1选定为S1＝S0+N－M0。
其中，还包括：
步骤70中，各Mura像素点的灰阶补偿值M中的最大值表示为M1，最小值表示为M2，当M1＞0，M2＜0时，若满足M1－M2≤2N且M1＞N，则第二灰阶S2选定为S2＝S0+N－M1。
其中，还包括：
步骤80、当仅有一个Mura像素点时，该Mura像素点的初始Mura补偿值M0若满足M0＞2N，则正常像素点和该Mura像素点的灰阶补偿值分别为﹣N和N。
其中，还包括：
步骤90、当仅有一个Mura像素点时，该Mura像素点的初始Mura补偿值M0若满足M0＜﹣2N，则正常像素点和该Mura像素点的灰阶补偿值分别为N和﹣N。
其中，所述显示面板为LCD显示面板。
其中，所述显示面板为OLED显示面板。
综上，本发明的Mura补偿方法可以有效的扩展Mura补偿的范围。
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其他有益效果显而易见。
附图中，
图1为本发明Mura补偿方法一较佳实施例中待补偿面板示意图；
图2为本发明Mura补偿方法一较佳实施例中补偿后面板示意图；
图3为本发明Mura补偿方法的流程图。
参见图3，其为本发明Mura补偿方法的流程图。本发明的Mura补偿方法能够改善现有Demura方法，不止是针对Mura像素点即亮暗变化点进行补偿，还可以针对正常像素点，也可以称为基底，进行补偿，同时调整两边的补偿值，若限定Mura像素点补偿范围为N个灰阶，并限定基底补偿范围同样为N个灰阶，那么整体的Demura补偿范围就会增大至2N个灰阶，有效的增加了补偿范围。
本发明的Mura补偿方法主要包括：
步骤10、通过相机获取显示面板在预设灰阶S0下的第一图像；即显示面板显示预设灰阶为S0的图像，通过相机拍摄图像的Mura状况。
步骤20、以预设灰阶S0为基准，根据所述第一图像得到所述显示面板上各个Mura像素点的初始Mura补偿值M0；确定灰阶图像中的正常像素点和Mura像素点，根据正常像素点的灰阶值灰阶S0确定各Mura像素点所需的Mura补偿值M0，对于显示亮度比较高的Mura像素点施加较低的灰阶值，也就是Mura补偿值M0为负，对于显示亮度比较低的Mura像素点， 施加较高的灰阶值，也就是Mura补偿值M0为正，从而使得Mura补偿后各像素点的亮度接近一致。
步骤30、预设灰阶补偿范围为N，N为自然数，判断各个Mura像素点的初始Mura补偿值M0是否都满足﹣N≤M0≤N；本发明目的在于增加Mura补偿范围，因此预设灰阶补偿范围为N，显示亮度比较高的Mura像素点在补偿时可以减去N个灰阶，显示亮度比较低的Mura像素点在补偿时可以增加N个灰阶；初始Mura补偿值M0可以用于确定Mura像素点与正常像素点之间的亮度关系，初始Mura补偿值M0可以为正整数或负整数，为正时表示Mura像素点亮度小于正常像素点，为负时表示Mura像素点亮度大于正常像素点。
步骤40、若各个Mura像素点的初始Mura补偿值M0都满足﹣N≤M0≤N，则直接采用各个Mura像素点的初始Mura补偿值M0作为目标Mura补偿值，根据所述目标Mura补偿值对各个Mura像素点进行Mura补偿；否则执行步骤50；通过此步骤可以判断出要补偿的灰阶值在补偿范围N以内，可以按照现有的补偿方式直接利用初始Mura补偿值M0补偿Mura像素点，将所有Mura像素点亮度补偿至与正常像素点一致，各个Mura像素点按照各自的初始Mura补偿值M0进行补偿。
步骤50、判断各个Mura像素点的初始Mura补偿值M0中的最大值M1和最小值M2是否满足M2＞0，N＜M1≤2N或者满足M1＜0，﹣2N≤M2＜﹣N；通过此步骤将各个Mura像素点的初始Mura补偿值M0与N和2N比较，此步骤判断各个Mura像素点是否全部需要增加或全部需要减少一定Mura补偿值，并且判断所需增加或减少的Mura补偿值是否在N以上2N以内。
步骤60、若各个Mura像素点的初始Mura补偿值M0中的最大值M1和最小值M2满足M2＞0，N＜M1≤2N或者满足M1＜0，﹣2N≤M2＜﹣N，则选定第一灰阶S1，以第一灰阶S1为基准分别得到所有像素点的第一Mura补偿值M
S1，且使所有像素点的第一Mura补偿值M
S1都满足﹣N≤M
S1≤N，采用所有像素点的第一Mura补偿值M
S1作为目标Mura补偿值，根据所述目标Mura补偿值对所有像素点进行Mura补偿。当判断各个Mura像素点全部需要增加或全部需要减少一定Mura补偿值时，并且所需要增加或减少的Mura补偿值的范围在N以上2N以内，本发明重新选定与正常像素点预设灰阶S0不同的第一灰阶S1作为Mura补偿的基准，以第一灰阶S1为基准分别得到所有像素点的第一Mura补偿值M
S1，且使所有像素点的第一Mura补偿值M
S1都满足﹣N≤M
S1≤N；并且所有像素点采用第一Mura 补偿值M
S1作为目标Mura补偿值，根据所述目标Mura补偿值对所有像素点进行Mura补偿，从而使正常像素点和Mura像素点的亮度都补偿到第一灰阶S1，实现亮度一致，同时通过对正常像素点和Mura像素点的双方向补偿扩大了补偿范围。其中，第一灰阶S1可以任意选取，只要使所有像素点的第一Mura补偿值M
S1都满足﹣N≤M
S1≤N即可。
步骤60中，当仅有一个Mura像素点时，对于该Mura像素点，初始Mura补偿值M0＝M1＝M2，若满足N＜M0≤2N，作为优选，第一灰阶S1可以选定为S1＝S0+N－M0。
本发明的Mura补偿方法还可以包括：步骤70、对于各个Mura像素点的初始Mura补偿值M0中的最大值M1和最小值M2，当M1＞0，M2＜0时，若满足M1－M2≤2N且M1或|M2|＞N，则选定第二灰阶S2，以第二灰阶S2为基准分得到所有像素点的第二Mura补偿值M
S2，且使所有像素点的第二Mura补偿值M
S2都满足﹣N≤M
S2≤N，所有像素点采用第二Mura补偿值M
S2作为目标Mura补偿值，根据所述目标Mura补偿值对所有像素点进行Mura补偿。
本发明通过步骤70来判断各Mura像素点所需的补偿值是否为有增有减，并且在所需的补偿值为有增有减时，进一步在各Mura像素点之间进行相互比较，判断是否满足增加的补偿值减去减少的补偿值(负值)的最大值在2N以内，但是增加补偿值或者减少补偿值单项大于N。满足条件时，本发明重新选定与正常像素点预设灰阶S0不同的第二灰阶S2作为Mura补偿的基准，以第二灰阶S2为基准分别得到所有像素点的第二Mura补偿值M
S2，且使所有像素点的第二Mura补偿值M
S2都满足﹣N≤M
S2≤N；通过将Mura像素点和正常像素点同时补偿至第二灰阶S2，实现亮度一致，同时通过对正常像素点和Mura像素点的双方向补偿扩大了补偿范围。其中，第二灰阶S2可以任意选取，只要使所有像素点的第二Mura补偿值M
S2都满足﹣N≤M
S2≤N即可。
步骤70中，各Mura像素点的灰阶补偿值M中的最大值表示为M1，最小值表示为M2，当M1＞0，M2＜0时，若满足M1－M2≤2N且M1＞N，也就是存在亮度小于正常像素点的Mura像素点且与正常像素点的灰阶差值大于N，作为优选，第二灰阶S2可以选定为S2＝S0+N－M1。补偿时将各Mura像素点和正常像素点都补偿至与第二灰阶S2亮度一致，也就是需要将正常像素点的灰阶减少M1－N，从而扩大补偿范围。
本发明的Mura补偿方法还可以包括：步骤80、当仅有一个Mura像素点时，该Mura像素点的初始Mura补偿值M0若满足M0＞2N，则正常像 素点和该Mura像素点的灰阶补偿值分别为﹣N和N。本发明的Mura补偿方法还可以包括：步骤90、当仅有一个Mura像素点时，该Mura像素点的初始Mura补偿值M0若满足M0＜﹣2N，则正常像素点和该Mura像素点的灰阶补偿值分别为N和﹣N。当满足步骤80和90中的条件时，Mura像素点亮度超出或低于正常像素点2N灰阶，无论如何补偿值都超出了2N，则确实没有办法补偿完全，最好的状况就是正常像素点(基底)补偿N灰阶，Mura像素点也补偿N灰阶，缩小亮度差距。
本发明的Mura补偿方法可以适用于LCD显示面板或OLED显示面板。
参见图1及图2，其为本发明Mura补偿方法一较佳实施例中待补偿面板及补偿后面板的示意图。此实施例中待补偿面板中仅有一个Mura像素点A。首先拍摄LCD面板的灰阶画面，判断需要补偿的灰阶值，如果Mura像素点A要补偿的灰阶值M在N以内，那么就直接补偿Mura像素点M灰阶，使Mura像素点A与基底(正常像素点)亮度一致。若补偿值M在N以上2N以内，那么就一方面补偿正常像素点M-N灰阶，另一方面补偿Mura像素点N灰阶。若补偿值M超出了2N，则确实没有办法补偿完全，最好的状况就是正常像素点补偿N灰阶，Mura像素点补偿N灰阶。
综上，本发明的Mura补偿方法可以有效的扩展Mura补偿的范围，从1倍扩展到2倍。
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后附的权利要求的保护范围。
Claims (8)
- 一种Mura补偿方法，包括：步骤10、通过相机获取显示面板在预设灰阶S0下的第一图像；步骤20、以预设灰阶S0为基准，根据所述第一图像得到所述显示面板上各个Mura像素点的初始Mura补偿值M0；步骤30、预设灰阶补偿范围为N，N为自然数，判断各个Mura像素点的初始Mura补偿值M0是否都满足﹣N≤M0≤N；步骤40、若各个Mura像素点的初始Mura补偿值M0都满足﹣N≤M0≤N，则直接采用各个Mura像素点的初始Mura补偿值M0作为目标Mura补偿值，根据所述目标Mura补偿值对各个Mura像素点进行Mura补偿；否则执行步骤50；步骤50、判断各个Mura像素点的初始Mura补偿值M0中的最大值M1和最小值M2是否满足M2＞0，N＜M1≤2N或者满足M1＜0，﹣2N≤M2＜﹣N；步骤60、若各个Mura像素点的初始Mura补偿值M0中的最大值M1和最小值M2满足M2＞0，N＜M1≤2N或者满足M1＜0，﹣2N≤M2＜﹣N，则选定第一灰阶S1，以第一灰阶S1为基准分别得到所有像素点的第一Mura补偿值M S1，且使所有像素点的第一Mura补偿值M S1都满足﹣N≤M S1≤N，所有像素点采用第一Mura补偿值M S1作为目标Mura补偿值，根据所述目标Mura补偿值对所有像素点进行Mura补偿。
- 如权利要求1所述的Mura补偿方法，还包括：步骤70、对于各个Mura像素点的初始Mura补偿值M0中的最大值M1和最小值M2，当M1＞0，M2＜0时，若满足M1－M2≤2N且M1或|M2|＞N，则选定第二灰阶S2，以第二灰阶S2为基准分得到所有像素点的第二Mura补偿值M S2，且使所有像素点的第二Mura补偿值M S2都满足﹣N≤M S2≤N，所有像素点采用第二Mura补偿值M S2作为目标Mura补偿值，根据所述目标Mura补偿值对所有像素点进行Mura补偿。
- 如权利要求1所述的Mura补偿方法，其中，步骤60中，当仅有一个Mura像素点时，对于该Mura像素点，初始Mura补偿值M0＝M1＝M2，若满足N＜M0≤2N，则第一灰阶S1选定为S1＝S0+N－M0。
- 如权利要求2所述的Mura补偿方法，还包括：步骤70中，各Mura像素点的灰阶补偿值M中的最大值表示为M1， 最小值表示为M2，当M1＞0，M2＜0时，若满足M1－M2≤2N且M1＞N，则第二灰阶S2选定为S2＝S0+N－M1。
- 如权利要求1所述的Mura补偿方法，还包括：步骤80、当仅有一个Mura像素点时，该Mura像素点的初始Mura补偿值M0若满足M0＞2N，则正常像素点和该Mura像素点的灰阶补偿值分别为﹣N和N。
- 如权利要求1所述的Mura补偿方法，还包括：步骤90、当仅有一个Mura像素点时，该Mura像素点的初始Mura补偿值M0若满足M0＜﹣2N，则正常像素点和该Mura像素点的灰阶补偿值分别为N和﹣N。
- 如权利要求1所述的Mura补偿方法，其中，所述显示面板为LCD显示面板。
- 如权利要求1所述的Mura补偿方法，其中，所述显示面板为OLED显示面板。
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