WO2018028110A1 - 一种降低amoled显示残影的驱动方法及驱动系统 - Google Patents

一种降低amoled显示残影的驱动方法及驱动系统 Download PDF

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WO2018028110A1
WO2018028110A1 PCT/CN2016/111339 CN2016111339W WO2018028110A1 WO 2018028110 A1 WO2018028110 A1 WO 2018028110A1 CN 2016111339 W CN2016111339 W CN 2016111339W WO 2018028110 A1 WO2018028110 A1 WO 2018028110A1
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brightness
pixel
layer
output
scale factor
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French (fr)
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曾玉超
黄泰钧
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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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]
    • G09G3/3225—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] using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • 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
    • G09G2320/0257—Reduction of after-image effects
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/046—Dealing with screen burn-in prevention or compensation of the effects thereof
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the invention belongs to the field of OLED display, and particularly relates to a driving method and a driving system for reducing residual image of an AMOLED display.
  • OLED display technology is a new display technology that has developed rapidly in recent years.
  • the OLED display technology is mainly based on the self-luminous characteristics of the organic light emitting diode, so that the organic semiconductor material and the luminescent material are driven by the electric field and are displayed by carrier injection and composite luminescence.
  • the driving modes of the OLED display are divided into a passive passive drive (PM OLED) and an active active drive (AMOLED).
  • PM OLED passive passive drive
  • AMOLED active active drive
  • LTPS TFT low temperature polysilicon thin film transistor
  • the next frame display picture after the display screen is switched does not have a high-brightness area.
  • the pixel voltage applied by the pixel having high luminance is high, the aging of the pixel driving transistor is faster than that of other pixels having low luminance, and therefore, the next frame image actually displayed after the display screen is switched is displayed as a residual image.
  • the difference in brightness of the image is obvious, so the difference in the aging of the driving transistor is more obvious, so that the high-contrast display is more likely to leave a residual image.
  • the main method for solving the residual image of AMOLED in the prior art is to multiply the brightness of each pixel in the displayed static picture by a uniform scale factor output, and improve the aging phenomenon of the transistor by reducing the driving voltage, thereby reducing the generation of residual image.
  • the overall brightness of the image is reduced, and its high contrast
  • the difference between the brightness of the pixels in the area and other areas is still relatively large, and the image layering is more obvious, which affects the effect of the OLED display.
  • the present invention proposes a solution to the above problems.
  • One of the technical problems to be solved by the present invention is to provide a method for reducing the residual image of a high contrast static picture and improving its display effect.
  • the embodiment of the present application first provides a driving method for reducing the residual image of the AMOLED display, including detecting whether the picture to be displayed is a static picture; if it is determined to be a static picture, performing the static picture Hierarchical segmentation; adjusts the output brightness scale factor of each pixel based on the result of the hierarchical segmentation; and outputs the brightness of the pixel with the output brightness scale factor corresponding to each pixel.
  • the hierarchically dividing the static picture comprises: determining a layered point brightness of the hierarchical segmentation; traversing each pixel in the static picture, and classifying the pixel to be closest to the brightness of the layered point In the hierarchy; calculate the new layered point brightness according to the divided levels; repeat the process of traversing, classifying each pixel, and repeatedly calculating the brightness of the new layered point until the brightness of each layer point no longer changes.
  • the step of classifying the pixel into a layer closest to the brightness of the layered point comprises: respectively acquiring pixel feature values of each pixel; calculating a relationship between the feature value of the pixel and the brightness of each layered point Difference; the pixel is classified into a layer corresponding to the minimum value of the absolute value of the difference.
  • the pixel feature value includes a maximum value of each sub-pixel gray scale of the pixel or a brightness parameter calculated according to each sub-pixel gray scale of the pixel.
  • the adjusting the output brightness ratio coefficient of each pixel based on the hierarchical segmentation comprises: performing brightness reduction on a higher brightness level with a smaller output brightness ratio coefficient for a pixel whose brightness belongs to different levels, and brightness Lower-level pixels are reduced in brightness with a larger output brightness scale factor; for pixels whose brightness belongs to the same level, the brightness is reduced with a smaller output brightness scale factor for pixels with higher brightness, and for lower-brightness pixels for pixels with lower brightness A larger output brightness scale factor reduces the brightness.
  • the adjusting the output brightness ratio coefficient of each pixel based on the hierarchical segmentation comprises: counting the layered point brightness of each layer and the pixel area of each layer; and according to the layered point brightness of each layer and each layer The pixel area determines the minimum output brightness scale factor of each layer; the output brightness scale factor of each pixel is determined according to the minimum output brightness scale coefficient of each layer, the layered point brightness of each layer, and the brightness of each pixel itself.
  • the minimum output luminance scale factor M k of each layer is determined according to the following expression:
  • Y k is the layered point brightness of each layer
  • S k is the pixel area of each layer
  • m k is the layer brightness control coefficient
  • k is the number of layers.
  • the output brightness scale factor of each pixel is determined according to the following expression:
  • c 1 , c 2 , and c 3 are the output luminance ratio coefficients of the respective layers
  • Y 1 , Y 2 , and Y 3 are the layered point luminances of the respective layers, respectively
  • M 1 , M 2 , and M 3 are layers respectively.
  • the minimum output brightness scale factor, y is the brightness of each pixel itself.
  • the embodiment of the present application further provides a driving system for reducing the residual image of the AMOLED display, comprising: a static picture detecting module, which detects whether the picture to be displayed is a static picture; and the hierarchical dividing module determines that the static picture is a static picture. And performing a hierarchical segmentation on the static image; a coefficient adjustment module that adjusts an output luminance scaling coefficient of each pixel based on a result of the hierarchical segmentation; and a processing output module that outputs a luminance of the pixel by an output luminance scaling coefficient corresponding to each pixel.
  • the hierarchical segmentation module determines hierarchical layer brightness of the hierarchical segmentation; traverses each pixel in the static image, and classifies the pixel into a layer closest to the brightness of the layered point; Hierarchy calculates the new layered point brightness; repeats the traversal investigation, assigns each pixel, and repeats the process of calculating the brightness of the new layered point until the brightness of each layer point no longer changes.
  • the generation of the residual image of the static picture during display can be significantly reduced, so that the high contrast static picture is compared. It is difficult to leave a shadow.
  • FIG. 1 is a schematic diagram showing generation of an afterimage of an AMOLED in the prior art
  • FIG. 2 is a schematic flow chart of a driving method for reducing an afterimage of an AMOLED display according to an embodiment of the invention
  • FIG. 3 is a schematic flow chart of a method for hierarchical segmentation according to an embodiment of the present invention.
  • FIG. 4 is a schematic flow chart of a hierarchical segmentation algorithm according to an embodiment of the present invention.
  • FIG. 5 is a flow chart showing a method of determining an output luminance scale factor of each pixel according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a driving system for reducing an afterimage of an AMOLED display according to an embodiment of the invention.
  • FIG. 2 is a schematic flow chart of a driving method for reducing an afterimage of an AMOLED display according to an embodiment of the present invention. As shown in the figure, the driving method includes the following steps:
  • Step S210 Detect whether the picture to be displayed is a static picture.
  • step S220 if it is determined to be a static screen, the static screen is hierarchically divided.
  • Step S230 Adjust an output luminance scale coefficient of each pixel based on a result of the hierarchical segmentation.
  • Step S240 outputting the brightness of the pixel with an output luminance proportional coefficient corresponding to each pixel.
  • step S210 it is first determined by the detection whether the picture to be displayed is a static picture, and if it is not a static picture, no brightness adjustment is needed. Only when it is determined that the screen is a static screen, step S220 is continued.
  • step S220 the static picture to be displayed is hierarchically divided, and specifically includes the following steps, as shown in FIG. 3:
  • Step S310 determining a layered point brightness of the hierarchical segmentation.
  • Step S320 traversing each pixel in the static picture, and classifying the pixel into a level closest to the brightness of the layered point.
  • Step S330 calculating a new layered point brightness according to the divided level.
  • Step S340 repeating the process of traversing, dividing each pixel, and repeatedly calculating the brightness of the new layered point until the brightness of each layer point does not change.
  • step S310 the number of divided layers and the brightness of the layered dots of each layer are determined according to the luminance distribution of the still picture. For example, a static picture to be displayed is divided into three layers, and the brightness of the layered points of each layer is determined to be 64, and the brightness of the first layer is 64, and the brightness of the first layer is 80.
  • the first layer of layered dots has a brightness of 160.
  • each pixel in the still picture is traversed to make a decision to hierarchically divide each pixel.
  • the pixel feature value of the pixel is first acquired.
  • the feature value of the pixel may be a maximum value of each sub-pixel gray scale of the pixel or a brightness parameter calculated according to each sub-pixel gray scale of the pixel.
  • the feature value of the pixel corresponds to the determined brightness of the layered point.
  • the feature value of the pixel is the maximum value of the gray level of each sub-pixel of the pixel
  • the brightness of the layer point is also expressed by the gray scale value.
  • the feature value of the pixel is a brightness parameter calculated according to the gray scale of each sub-pixel of the pixel
  • the layered point brightness is also a corresponding brightness parameter.
  • the difference between the pixel feature value of the pixel and the brightness of each layer point is separately calculated. It is easy to understand that the difference can characterize the proximity of the brightness of the pixel to the brightness of the layered dots.
  • the minimum value of the absolute value of the difference between the pixel feature value and the brightness of each layer point is calculated, and the pixel is classified into a layer corresponding to the minimum value. For example, if the pixel feature value of the pixel is 70, then
  • step S330 the brightness of the new layered point is separately calculated based on the divided layers. Specifically, the value representing the brightness attribute of the layer is obtained according to the number of pixels actually included in each layer and the pixel feature value of the pixel. In one embodiment of the present invention, the pixel feature value of each pixel in the layer is taken. The average value is used as the brightness of the new layered point of the layer.
  • Step S320 and step S330 until the brightness of each layer point does not change, obtaining a stable hierarchical segmentation of the static picture to be displayed.
  • the output luminance scale factor of the layer of pixels is separately adjusted for each layer. For pixels whose brightness belongs to different levels, the brightness is reduced with a smaller output brightness scale factor for higher brightness levels, and the brightness is reduced for a lower brightness level pixel with a larger output brightness scale factor. For pixels whose brightness belongs to the same level, the brightness of the pixels with higher brightness is reduced with a smaller output brightness ratio coefficient, and the brightness of the lower brightness pixels is reduced with a larger output brightness ratio coefficient. This can reduce the luminance difference between the pixels with higher luminance and the pixels with lower luminance, and reduce the contrast between the pixels, thereby improving the screen display.
  • step S230 further includes the following steps, as shown in FIG. 5:
  • step S231 the brightness of the layered dots of each layer and the pixel area of each layer are counted.
  • Step S232 determining a minimum output luminance scale coefficient of each layer according to the layered point brightness of each layer and the pixel area of each layer.
  • Step S233 determining an output luminance scale coefficient of each pixel according to a minimum output luminance scale coefficient of each layer, a layered point luminance of each layer, and a brightness of each pixel itself.
  • step S231 it is assumed that the still picture to be displayed is divided into k layers, and the layered point brightness of each layer and the pixel area of each layer are counted, and the first layer, the second layer, ..., the kth layer are respectively divided.
  • the layer brightness is denoted by Y 1 , Y 2 , ..., Y k
  • the pixel areas of the first layer, the second layer, ..., the kth layer are denoted as S 1 , S 2 , ..., S k .
  • the pixel area can be correspondingly represented by the number of pixels included in each layer.
  • the minimum output luminance scaling factor M k of each layer may be determined according to the expression (1):
  • Y k is the layered point brightness of each layer
  • Sk is the pixel area of each layer
  • m k is the layer brightness control coefficient
  • k is the number of layers.
  • the static picture to be displayed is divided into three layers, and the layered points of each layer are sequentially 64, 80, and 160. It should be noted that it is assumed that 64, 80, and 160 are the brightness of the layered dots.
  • the repeated layer calculation and the stable layered point brightness determined by repeating the division multiple times.
  • the pixel areas of each layer are 50%, 30% and 20%, respectively.
  • the selection of the layer brightness control coefficient m k can be determined according to the attributes of the static picture to be displayed.
  • the value of m k is determined according to the average brightness of the still picture to be displayed, and m 1 , m 2 and m 3 are 1 , 0.8 and 0.7, respectively.
  • the output luminance scale factor of each pixel can be determined according to the expression (2):
  • c 1 , c 2 , and c 3 are the output luminance scale coefficients of the respective layers, and y is the luminance of each pixel itself.
  • the luminance of each pixel is adjusted and outputted with the output luminance scaling factor corresponding to each pixel.
  • the pixel and the pixel are both adjusted based on their original brightness, it is not only advantageous for reducing the driving voltage of the pixel, but also reducing the brightness of the high contrast region. At the same time, the level change between pixels tends to be flat, improving the display effect of the picture.
  • a driving system for reducing image sticking of an AMOLED is also proposed. As shown in FIG. 6, the system includes:
  • the static picture detection module 61 detects whether the picture to be displayed is a static picture.
  • the hierarchical segmentation module 62 determines whether the static image is hierarchically divided if it is a static image.
  • the coefficient adjustment module 63 adjusts the output luminance scale factor of each pixel based on the result of the hierarchical segmentation.
  • the processing output module 64 outputs the brightness of the pixel with an output luminance scale factor corresponding to each pixel.
  • the static image is hierarchically segmented, and the output brightness ratio coefficient of each pixel is respectively determined based on the brightness of the different layers and the pixels themselves, which can significantly reduce the generation of residual images of the static image during display, so that the image is highly It is more difficult to leave a residual image than a static picture.
  • the brightness of the high-contrast area of the bottom static image can be reduced, and the degree of layering of the picture can be reduced to improve the display effect.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device, which can be centralized on a single computing device or distributed over a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in a storage device by a computing device, or they may be fabricated into individual integrated circuit modules, or many of them Modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

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Abstract

一种降低AMOLED显示残影的驱动方法及驱动系统，该方法包括侦测待显示的画面是否为静态画面（S210）；若判断为静态画面，则对该静态画面进行层次分割（S220）；基于层次分割的结果调整每个像素的输出亮度比例系数（S230）；以各像素对应的输出亮度比例系数输出像素的亮度（S240）。该方法能够显著地降低静态画面在显示时残影的产生。

Description

一种降低AMOLED显示残影的驱动方法及驱动系统
相关申请的交叉引用
本申请要求享有2016年08月09日提交的名称为“一种降低AMOLED显示残影的驱动方法及驱动系统”的中国专利申请CN201610649241.8的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本发明属于OLED显示领域，尤其涉及一种降低AMOLED显示残影的驱动方法及驱动系统。
背景技术
有机发光二极管(Organic Light Emitting Display，OLED)显示技术是近年来快速发展的一种全新的显示技术。OLED显示技术主要是基于有机发光二极管的自发光特性，使有机半导体材料和发光材料在电场驱动下，通过载流子注入和复合发光显示。
OLED显示的驱动方式分为被动式的无源驱动(Passive Matrix，PMOLED)和主动式的有源驱动(Active Matrix，AMOLED)。在AMOLED显示中需要为每个像素配备具有开关功能的低温多晶硅薄膜晶体管(LTPS TFT)来对有机发光二极管施加驱动电压。因此，AMOLED在显示静态高对比图像一段时间后再进行画面切换会出现显示残影的问题。
如图1所示，在静态显示高对比图片中具有一块高亮度区域，显示画面切换后的下一帧显示图片如图中切换显示画面所示，不再具有高亮度区域。而由于亮度高的像素施加的像素电压较高，像素驱动晶体管的老化比其他亮度低的像素快，因此，显示画面切换后实际显示的下一帧图片如显示残影所示。对于高对比度显示画面，由于图像亮暗差异明显，所以驱动晶体管老化差异更加明显，从而高对比度显示画面更容易留下残影。
现有技术中解决AMOLED显示残影的主要方法是将显示的静态画面中的各像素亮度乘以统一的比例系数输出，通过降低驱动电压来改善晶体管的老化现象，减少残影的产生。但对于高对比静态画面，图像整体亮度降低后，其高对比 区域与其他区域像素的亮暗差异仍然比较大，且图像层次化较为明显，影响OLED显示的效果。
本发明针对上述问题提出解决方案。
发明内容
本发明所要解决的技术问题之一是需要提供一种降低高对比静态画面显示残影，改善其显示效果的方法。
为了解决上述技术问题，本申请的实施例首先提供了一种降低AMOLED显示残影的驱动方法，包括侦测待显示的画面是否为静态画面；若判断为静态画面，则对所述静态画面进行层次分割；基于层次分割的结果调整每个像素的输出亮度比例系数；以各像素对应的输出亮度比例系数输出像素的亮度。
优选地，所述对所述静态画面进行层次分割，包括：确定层次分割的分层点亮度；遍历所述静态画面中的每一个像素，将像素划归到与所述分层点亮度最接近的层次中；根据划分好的层次计算新的分层点亮度；重复遍历考察、划归各像素以及重复计算新的分层点亮度的过程，直至各分层点亮度不再变化。
优选地，所述将像素划归到与所述分层点亮度最接近的层次中，包括：分别获取各像素的像素特征值；计算所述像素的特征值与各分层点亮度之间的差值；将像素划归到与所述差值的绝对值的最小值相对应的分层中。
优选地，所述像素特征值包括像素的各子像素灰阶的最大值或根据像素的各子像素灰阶计算得到的亮度参数。
优选地，所述基于所述层次分割调整每个像素的输出亮度比例系数，包括：对于亮度属于不同层次的像素，对亮度较高层次的以较小的输出亮度比例系数进行亮度降低，对亮度较低层次的像素以较大的输出亮度比例系数进行亮度降低；对亮度属于同一层次的像素，对亮度较高的像素以较小的输出亮度比例系数进行亮度降低，对亮度较低的像素以较大的输出亮度比例系数进行亮度降低。
优选地，所述基于所述层次分割调整每个像素的输出亮度比例系数，包括：统计各层的分层点亮度及各层的像素面积；根据所述各层的分层点亮度及各层的像素面积确定各层的最小输出亮度比例系数；根据所述各层的最小输出亮度比例系数、各层的分层点亮度及各像素自身的亮度确定每个像素的输出亮度比例系数。
优选地，根据如下表达式确定各层的最小输出亮度比例系数Mk：
Mk＝Yk*Sk*mk
其中，Yk为各层的分层点亮度，Sk为各层的像素面积，mk为层亮度控制系数，k表示层数。
优选地，所述静态画面被分割为三层时，根据如下表达式确定每个像素的输出亮度比例系数：
Figure PCTCN2016111339-appb-000001
Figure PCTCN2016111339-appb-000002
Figure PCTCN2016111339-appb-000003
其中，c1、c2、c3分别为各层的输出亮度比例系数，Y1、Y2、Y3分别为各层的分层点亮度，M1、M2、M3分别为各层的最小输出亮度比例系数，y为各像素自身的亮度。
本申请的实施例还提供了一种降低AMOLED显示残影的驱动系统，包括：静态画面侦测模块，其侦测待显示的画面是否为静态画面；层次分割模块，其判断若为静态画面，则对所述静态画面进行层次分割；系数调整模块，其基于层次分割的结果调整每个像素的输出亮度比例系数；处理输出模块，其以各像素对应的输出亮度比例系数输出像素的亮度。
优选地，所述层次分割模块确定层次分割的分层点亮度；遍历所述静态画面中的每一个像素，将像素划归到与所述分层点亮度最接近的层次中；根据划分好的层次计算新的分层点亮度；重复遍历考察、划归各像素以及重复计算新的分层点亮度的过程，直至各分层点亮度不再变化。
与现有技术相比，上述方案中的一个或多个实施例可以具有如下优点或有益效果：
通过对静态画面进行层次分割，并分别基于不同的层次、像素自身的亮度分别确定每个像素的输出亮度比例系数，能够显著地降低静态画面在显示时残影的产生，使得高对比静态画面较难留下残影。
本发明的其他优点、目标，和特征在某种程度上将在随后的说明书中进行阐述，并且在某种程度上，基于对下文的考察研究对本领域技术人员而言将是显而易见的，或者可以从本发明的实践中得到教导。本发明的目标和其他优点 可以通过下面的说明书，权利要求书，以及附图中所特别指出的结构来实现和获得。
附图说明
附图用来提供对本申请的技术方案或现有技术的进一步理解，并且构成说明书的一部分。其中，表达本申请实施例的附图与本申请的实施例一起用于解释本申请的技术方案，但并不构成对本申请技术方案的限制。
图1为现有技术中AMOLED显示残影的产生示意图；
图2为根据本发明实施例的降低AMOLED显示残影的驱动方法的流程示意图；
图3为根据本发明实施例的层次分割的方法的流程示意图；
图4为根据本发明实施例的层次分割算法流程示意图；
图5为根据本发明实施例的确定每个像素的输出亮度比例系数的方法的流程示意图；
图6为根据本发明实施例的降低AMOLED显示残影的驱动系统的结构示意图。
具体实施方式
以下将结合附图及实施例来详细说明本发明的实施方式，借此对本发明如何应用技术手段来解决技术问题，并达成相应技术效果的实现过程能充分理解并据以实施。本申请实施例以及实施例中的各个特征，在不相冲突前提下可以相互结合，所形成的技术方案均在本发明的保护范围之内。
图2为根据本发明实施例的降低AMOLED显示残影的驱动方法的流程示意图，如图所示，该驱动方法包括以下步骤：
步骤S210、侦测待显示的画面是否为静态画面。
步骤S220、若判断为静态画面，则对该静态画面进行层次分割。
步骤S230、基于层次分割的结果调整每个像素的输出亮度比例系数。
步骤S240、以各像素对应的输出亮度比例系数输出像素的亮度。
具体的，在步骤S210中，先通过侦测判断待显示的画面是否为静态画面，如果不是静态画面，则不需要进行亮度调整。只有判断为静态画面时，才继续执行步骤S220。
在步骤S220中，对待显示的静态画面进行层次分割，具体包括以下步骤，如图3所示：
步骤S310、确定层次分割的分层点亮度。
步骤S320、遍历静态画面中的每一个像素，将像素划归到与上述分层点亮度最接近的层次中。
步骤S330、根据划分好的层次计算新的分层点亮度。
步骤S340、重复遍历考察、划归各像素以及重复计算新的分层点亮度的过程，直至各分层点亮度不再变化。
其中，在步骤S310中，根据静态画面的亮度分布确定分割层数以及每层的分层点亮度。举例而言，将一帧待显示静态画面分割为三层，并将每一层的分层点亮度分别确定为，第一层分层点亮度为64，第一层分层点亮度为80，第一层分层点亮度为160。
在步骤S320中，遍历静态画面中的每一个像素进行判断对每一个像素进行层次划分。具体的，先获取像素的像素特征值。在本发明的一个实施例中，像素的特征值可以为像素的各子像素灰阶的最大值或根据像素的各子像素灰阶计算得到的亮度参数。
需要注意的是，像素的特征值与确定的分层点亮度相对应。当像素的特征值为像素的各子像素灰阶的最大值时，分层点亮度也以灰阶值表示。当像素的特征值为根据像素的各子像素灰阶计算得到的亮度参数时，分层点亮度也为对应的亮度参数。
再分别计算该像素的像素特征值与各分层点亮度之间的差值。容易理解的是，该差值能够表征该像素的亮度与分层点亮度之间接近程度。
进一步地，计算像素特征值与各分层点亮度之间的差值的绝对值的最小值，将像素划归到与该最小值相对应的分层中。举例而言，像素的像素特征值为70，那么根据该特征值以及各分层点亮度，分别计算|70-64|，|70-80|以及|70-160|，其结果分别为6，10和90，因此将该像素划分到第一层中。
接下来，在步骤S330中，根据划分好的层次分别计算新的分层点的亮度。具体为，根据每个分层中实际包含的像素的个数及像素的像素特征值获取表征该层次亮度属性的数值，在本发明的一个实施例中，取分层中各像素的像素特征值的平均值作为该层的新的分层点亮度。
当计算得到的新的各分层点亮度相比于旧的分层点亮度有变化时，重复上面 步骤S320和步骤S330，直至各分层点亮度不再变化，得到待显示的静态画面的稳定的层次分割。
上述层次分割算法的完整流程如图4所示。
在得到静态画面的层次分割后，针对每一层分别调整该层像素的输出亮度比例系数。对于亮度属于不同层次的像素，对亮度较高层次的以较小的输出亮度比例系数进行亮度降低，对亮度较低层次的像素以较大的输出亮度比例系数进行亮度降低。对亮度属于同一层次的像素，对亮度较高的像素以较小的输出亮度比例系数进行亮度降低，对亮度较低的像素以较大的输出亮度比例系数进行亮度降低。这样能够降低亮度较高的像素与亮度较低的像素之间的亮度差，降低各像素之间的对比度，进而改善画面显示。
具体的，步骤S230进一步包括如下步骤，如图5所示：
步骤S231、统计各层的分层点亮度及各层的像素面积。
步骤S232、根据各层的分层点亮度及各层的像素面积确定各层的最小输出亮度比例系数。
步骤S233、根据各层的最小输出亮度比例系数、各层的分层点亮度及各像素自身的亮度确定每个像素的输出亮度比例系数。
在步骤S231中，假设待显示的静态画面被分为了k层，统计各层的分层点亮度及各层的像素面积，分别将第1层，第2层，……，第k层的分层点亮度记为Y1，Y2，……，Yk，将第1层，第2层，……，第k层的像素面积记为S1，S2，……，Sk。
需要说明的是，可以用各层中所包含的像素的个数来对应表示像素面积。
在步骤S232中，各层的最小输出亮度比例系数分别记为M1＝g1(S1,Y1)，M2＝g2(S2,Y2)，……，Mk＝gk(Sk,Yk)。
在本发明的一个实施例中，可以根据表达式(1)确定各层的最小输出亮度比例系数Mk：
Mk＝Yk*Sk*mk  (1)
式中，Yk为各层的分层点亮度，Sk为各层的像素面积，mk为层亮度控制系数，k表示层数。
举例而言，待显示的静态画面被分割为三层，各层的分层点亮度依次为64、80和160，需要注意的是，这里假设64、80和160为经过分层点亮度的多次重复计算以及多次重复划分而确定的稳定的分层点亮度。与各分层点亮度分别对应 的各层的像素面积分别为50％，30％和20％。
层亮度控制系数mk的选取可以根据待显示静态画面的属性确定……。例如在本实施例中，根据待显示静态画面的平均亮度确定mk的数值，m1，m2和m3分别为1，0.8和0.7。
在本发明的另一个实施例中，当待显示的静态画面被分割为三层时，可以根据表达式(2)确定每个像素的输出亮度比例系数：
Figure PCTCN2016111339-appb-000004
Figure PCTCN2016111339-appb-000005
Figure PCTCN2016111339-appb-000006
式中，c1、c2、c3分别为各层的输出亮度比例系数，y为各像素自身的亮度。
在分别获得每个像素的输出亮度比例系数后，以各像素对应的输出亮度比例系数调整各像素的亮度并输出。
在本发明的实施例中，由于像素与像素之间都是基于自身原有的亮度进行调整的，因此不仅有利于降低像素的驱动电压，降低高对比度区域的亮度。同时像素之间的层次变化趋于平缓，改善画面显示效果。
在本发明的另一个实施例中，还提出了一种用于降低AMOLED显示残影的驱动系统，如图6所示，该系统包括：
静态画面侦测模块61，其侦测待显示的画面是否为静态画面。
层次分割模块62，其判断若为静态画面，则对静态画面进行层次分割。
系数调整模块63，其基于层次分割的结果调整每个像素的输出亮度比例系数。
处理输出模块64，其以各像素对应的输出亮度比例系数输出像素的亮度。
上述各模块的功能均可参照前一实施例中相对应的方法步骤进行执行，此处不再赘述。
本发明实施例通过对静态画面进行层次分割，并分别基于不同的层次、像素自身的亮度分别确定每个像素的输出亮度比例系数，能够显著地降低静态画面在显示时残影的产生，使得高对比静态画面较难留下残影。
本发明的实施例在井底静态画面高对比度区域的亮度的同时，还能够降低画面的层次化程度，改善显示效果。
本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。
虽然本发明所揭露的实施方式如上，但所述的内容只是为了便于理解本发明而采用的实施方式，并非用以限定本发明。任何本发明所属技术领域内的技术人员，在不脱离本发明所揭露的精神和范围的前提下，可以在实施的形式上及细节上作任何的修改与变化，但本发明的专利保护范围，仍须以所附的权利要求书所界定的范围为准。

Claims (10)

  1. 一种降低AMOLED显示残影的驱动方法，包括：
    侦测待显示的画面是否为静态画面；
    若判断为静态画面，则对所述静态画面进行层次分割；
    基于层次分割的结果调整每个像素的输出亮度比例系数；
    以各像素对应的输出亮度比例系数输出像素的亮度。
  2. 根据权利要求1所述的方法，其中，所述对所述静态画面进行层次分割，包括：
    确定层次分割的分层点亮度；
    遍历所述静态画面中的每一个像素，将像素划归到与所述分层点亮度最接近的层次中；
    根据划分好的层次计算新的分层点亮度；
    重复遍历考察、划归各像素以及重复计算新的分层点亮度的过程，直至各分层点亮度不再变化。
  3. 根据权利要求2所述的方法，其中，所述将像素划归到与所述分层点亮度最接近的层次中，包括：
    分别获取各像素的像素特征值；
    计算所述像素的特征值与各分层点亮度之间的差值；
    将像素划归到与所述差值的绝对值的最小值相对应的分层中。
  4. 根据权利要求3所述的方法，其中，所述像素特征值包括像素的各子像素灰阶的最大值或根据像素的各子像素灰阶计算得到的亮度参数。
  5. 根据权利要求1所述的方法，其中，所述基于所述层次分割调整每个像素的输出亮度比例系数，包括：
    对于亮度属于不同层次的像素，对亮度较高层次的以较小的输出亮度比例系数进行亮度降低，对亮度较低层次的像素以较大的输出亮度比例系数进行亮度降低；
    对亮度属于同一层次的像素，对亮度较高的像素以较小的输出亮度比例系数进行亮度降低，对亮度较低的像素以较大的输出亮度比例系数进行亮度降低。
  6. 根据权利要求2所述的方法，其中，所述基于所述层次分割调整每个像素的输出亮度比例系数，包括：
    统计各层的分层点亮度及各层的像素面积；
    根据所述各层的分层点亮度及各层的像素面积确定各层的最小输出亮度比例系数；
    根据所述各层的最小输出亮度比例系数、各层的分层点亮度及各像素自身的亮度确定每个像素的输出亮度比例系数。
  7. 根据权利要求6所述的方法，其中，根据如下表达式确定各层的最小输出亮度比例系数Mk：
    Mk＝Yk*Sk*mk
    其中，Yk为各层的分层点亮度，Sk为各层的像素面积，mk为层亮度控制系数，k表示层数。
  8. 根据权利要求7所述的方法，其中，当所述静态画面被分割为三层时，根据如下表达式确定每个像素的输出亮度比例系数：
    Figure PCTCN2016111339-appb-100001
    Figure PCTCN2016111339-appb-100002
    Figure PCTCN2016111339-appb-100003
    其中，c1、c2、c3分别为各层的输出亮度比例系数，Y1、Y2、Y3分别为各层的分层点亮度，M1、M2、M3分别为各层的最小输出亮度比例系数，y为各像素自身的亮度。
  9. 一种降低AMOLED显示残影的驱动系统，包括：
    静态画面侦测模块，其侦测待显示的画面是否为静态画面；
    层次分割模块，其判断若为静态画面，则对所述静态画面进行层次分割；
    系数调整模块，其基于层次分割的结果调整每个像素的输出亮度比例系数；
    处理输出模块，其以各像素对应的输出亮度比例系数输出像素的亮度。
  10. 根据权利要求9所述的系统，其中，所述层次分割模块
    确定层次分割的分层点亮度；
    遍历所述静态画面中的每一个像素，将像素划归到与所述分层点亮度最接近的层次中；
    根据划分好的层次计算新的分层点亮度；
    重复遍历考察、划归各像素以及重复计算新的分层点亮度的过程，直至各分 层点亮度不再变化。
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