WO2019033650A1 - 一种amoled显示器的驱动方法及系统 - Google Patents

一种amoled显示器的驱动方法及系统 Download PDF

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WO2019033650A1
WO2019033650A1 PCT/CN2017/116411 CN2017116411W WO2019033650A1 WO 2019033650 A1 WO2019033650 A1 WO 2019033650A1 CN 2017116411 W CN2017116411 W CN 2017116411W WO 2019033650 A1 WO2019033650 A1 WO 2019033650A1
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output power
positive voltage
gray
ovdd
power supply
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PCT/CN2017/116411
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French (fr)
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颜伟男
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武汉华星光电技术有限公司
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Priority to US15/743,438 priority Critical patent/US10497307B2/en
Publication of WO2019033650A1 publication Critical patent/WO2019033650A1/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]
    • 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

Definitions

  • the present invention relates to Thin Film Transistor (TFT) technology, and in particular to a driving method and system for an AMOLED display.
  • TFT Thin Film Transistor
  • AMOLED Active-matrix Organic Light-Emitting Diode
  • LCD Organic Light-Emitting Diode
  • AMOLED display technology is recognized by the industry as a new generation display technology after LCD. At present, AMOLED displays have been increasingly used in various display fields such as televisions, mobile phones, automobiles, and wearers.
  • the technical problem to be solved by the present invention is to provide a driving method and system for an AMOLED display, which can reduce the cross-voltage of the AMOLED and improve the working efficiency of the PMIC, thereby achieving further energy saving.
  • an aspect of an embodiment of the present invention provides a driving method of an AMOLED display, including the following steps:
  • mapping all gray levels in the input image signal mapping gray scale 0 to Gi to gray scale 0 to 255;
  • the output power supply positive voltage corresponding to the area is adjusted, so that the brightness corresponding to the adjusted 0 to 255 gray scale is the same as the brightness corresponding to 0 to Gi before the adjustment.
  • the step of mapping all the gray levels in the input image signal and mapping the gray levels 0 to Gx to the gray levels 0 to 255 is specifically as follows:
  • the gray value of Gx is between 0 and Gi.
  • the step of adjusting the output power supply positive voltage corresponding to the area, so that the adjusted brightness corresponding to the 0 to 255 gray level is the same as the brightness corresponding to 0 to Gi before the adjustment includes:
  • OVDD' OVDD-(V Gi -V 255 )
  • OVDD' is the positive voltage of the output power supply after the current area is adjusted
  • OVDD is the positive voltage of the original output power supply in the current area
  • V Gi is the original output power supply positive voltage corresponding to the gray level Gi
  • V 255 is the original corresponding to the gray level 255.
  • a driving system of an AMOLED display further includes a driving IC module, a GAMMA voltage driving module, a PMIC module, a display panel, and a data input unit, wherein the driving IC module include:
  • a dividing unit configured to divide a display area of the display panel into a plurality of areas from top to bottom, each area including at least one line of pixels;
  • a maximum gray scale obtaining unit configured to sequentially obtain an input image signal corresponding to each region from the data input unit, to obtain a maximum gray level Gi in the input image signal of the region;
  • a gray-scale mapping unit configured to map all gray levels in the input image signal when the maximum gray level Gi is greater than a predetermined threshold, and map the gray levels 0 to Gi to gray levels 0 to 255;
  • the adjustment control unit is configured to adjust the output power supply positive voltage corresponding to the area, so that the brightness corresponding to the adjusted 0 to 255 gray scale is the same as the brightness corresponding to 0 to Gi before the adjustment.
  • the grayscale mapping unit includes:
  • a calculation unit configured to obtain a gray scale G'x after each gray-scale Gx mapping according to the following formula:
  • the gray value of Gx is between 0 and Gi.
  • the adjustment control unit includes:
  • the adjustment voltage obtaining unit is configured to obtain the positive voltage of the output power source after the current region adjustment according to the following formula:
  • OVDD' OVDD-(V Gi -V 255 )
  • OVDD' is the positive voltage of the output power supply after the current area is adjusted
  • OVDD is the positive voltage of the original output power supply in the current area
  • V Gi is the original output power supply positive voltage corresponding to the gray level Gi
  • V 255 is the original corresponding to the gray level 255.
  • an adjusting unit configured to control the PMIC module and the GAMMA voltage driving module to output the adjusted output power positive voltage obtained by the adjusting voltage obtaining unit to a current area of the display panel.
  • an image is acquired from the input signal unit by the driving IC module, and when the maximum gray level Gi in the image is greater than a predetermined threshold, all gray levels in the input image signal are mapped, and the gray scales 0 to Gi are mapped.
  • the gray level 0 ⁇ 255 while controlling the PMIC module to reduce OVDD, and adjust the GAMMA voltage, so that the brightness corresponding to the adjusted gray level is the same as the brightness corresponding to the gray level before adjustment; because the output voltage OVDD is lowered, and the PMIC module is at OVDD -OVSS increases efficiency when the cross-voltage is low, so the power saving effect is achieved without changing the brightness of the screen.
  • the input image can be divided into multiple regions, and the OVDD voltage is respectively adjusted for different gray levels of the region, so that the power saving effect can be maximized.
  • FIG. 1 is a schematic diagram of a main flow of an embodiment of a driving method of an AMOLED display provided by the present invention
  • Figure 2 is a more detailed flow diagram corresponding to Figure 1;
  • FIG. 3 is a schematic diagram of dividing a display area of the display in FIG. 1;
  • FIG. 4 is a schematic diagram of performing gray scale mapping in FIG. 1;
  • FIG. 5 is a schematic structural diagram of an embodiment of a driving system of an AMOLED display provided by the present invention.
  • FIG. 6 is a schematic structural view of the driving IC module of FIG. 5;
  • Fig. 7 is a schematic structural view of the adjustment control unit of Fig. 5.
  • connection In the description of the present invention, it should be noted that the terms “installation”, “connected”, and “connected” are to be understood broadly, and may be fixed or detachable, for example, unless otherwise explicitly defined and defined.
  • the ground connection, or the integral connection may be a mechanical connection, may be directly connected, or may be indirectly connected through an intermediate medium, and may be internal communication between the two elements.
  • the specific meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.
  • FIG. 1 a schematic flowchart of an embodiment of a driving method of an AMOLED display provided by the present invention is shown; and FIG. 2 to FIG. 4 are also combined.
  • the driving method of the AMOLED display includes the following steps:
  • Step S10 dividing the display area of the display into a plurality of areas from top to bottom, each area including at least one line of pixels;
  • Step S11 sequentially obtaining an input image signal corresponding to each region, and obtaining a maximum gray level Gi in the input image signal of the region;
  • Step S12 when the maximum gray level Gi is greater than a predetermined threshold, mapping all gray levels in the input image signal, mapping gray scale 0 to Gi to gray scale 0 to 255;
  • step S12 is specifically: calculating the gray scale G'x after each gray-scale Gx mapping according to the following formula:
  • the gray value of Gx is between 0 and Gi.
  • step S13 the output power supply positive voltage corresponding to the area is adjusted, so that the adjusted brightness corresponding to the 0 to 255 gray level is the same as the brightness corresponding to 0 to Gi before the adjustment.
  • step S13 is to include:
  • OVDD' OVDD-(V Gi -V 255 )
  • OVDD' is the positive voltage of the output power supply after the current area is adjusted
  • OVDD is the positive voltage of the original output power supply in the current area
  • V Gi is the original output power supply positive voltage corresponding to the gray level Gi
  • V 255 is the original corresponding to the gray level 255.
  • Figure 2 shows the detailed workflow of the present invention.
  • the image is divided into a plurality of regions (see FIG. 3), and the driving IC module in the AMOLED display obtains the maximum grayscale Gi in the i-th region.
  • the driving IC module in the AMOLED display obtains the maximum grayscale Gi in the i-th region.
  • the step-down operation is not performed.
  • Gi>G th the gray scales 0 to Gi are mapped to 0 to 255.
  • the specific mapping process can be described as follows with reference to FIG. 4:
  • the illustration on the left side corresponds to the information before the mapping
  • the icon on the right side corresponds to the information after the mapping
  • the ordinate is the luminance value
  • the abscissa is the gray scale value
  • V 255 is the brightness corresponding to the gray value 255 before mapping
  • L' 255 is the maximum brightness corresponding to the gray value 255 after mapping
  • 2.2 in the formula is the GAMMA index of the example herein, in other embodiments Other values can also be used.
  • L' 255 is the maximum brightness after mapping.
  • the brightness Lx is:
  • I OLED k(OVDD-V data ) 2
  • V data is the voltage value corresponding to a certain image data
  • k is a fixed coefficient value
  • the changed OVDD' can be obtained as:
  • OVDD' OVDD-(V Gi -V 255 )
  • the driver IC module in the AMOLED display sends an instruction to the PMIC module (power management module), adjusts OVDD to the changed voltage, and then sends the mapped grayscale voltage to the i area of the display panel, and then processes the data of the next area.
  • PMIC module power management module
  • the driver IC module in the AMOLED display acquires an image from the input signal while obtaining the maximum gray scale Gx of the image.
  • Gx can be mapped to 255 grayscale output, and the PMIC is controlled to lower OVDD, so that the adjusted 255 grayscale corresponds to the same brightness as the pre-adjusted Gx.
  • the gray scale smaller than Gx in the original image is mapped, so that the brightness corresponding to the original gray scale remains unchanged.
  • the PMIC module increases the operating efficiency when the OVDD-OVSS cross-voltage is low, so that the power saving effect can be achieved without changing the screen brightness.
  • the driver IC module divides the input image into a plurality of regions according to FIG. 3, so that the degree of OVDD reduction in each region is different, and the maximum power saving is achieved. It can be understood that the number of regions can be determined by the response speed of the PMIC module. If the response speed of the PMIC module is faster, the more regions that can be divided, if the PMIC module responds fast enough, the OVDD of each row of pixels can not be the same.
  • FIG. 5 a schematic structural diagram of an embodiment of a driving system of an AMOLED display provided by the present invention is shown; and in conjunction with FIG. 6 to FIG. 7, in this embodiment, the AMOLED display is provided.
  • the drive system includes a drive IC module, a GAMMA voltage drive module, a PMIC module, a display panel, and a data input unit, wherein the drive IC module 1 further includes:
  • a dividing unit 10 configured to divide a display area of the display panel into a plurality of areas from top to bottom, each area including at least one line of pixels;
  • the maximum gray scale obtaining unit 11 is configured to sequentially obtain an input image signal corresponding to each region from the data input unit, to obtain a maximum gray level Gi in the input image signal of the region;
  • the gray scale mapping unit 12 is configured to map all the gray levels in the input image signal when the maximum gray level Gi is greater than a predetermined threshold, and map the gray levels 0 to Gi to gray scale 0 to 255;
  • the adjustment control unit 13 is configured to adjust the output power supply positive voltage corresponding to the area, so that the brightness corresponding to the adjusted 0 to 255 gray scale is the same as the brightness corresponding to 0 to Gi before the adjustment.
  • the grayscale mapping unit 12 includes:
  • a calculation unit (not shown) for calculating the gray scale G'x after each gray scale Gx mapping according to the following formula:
  • the gray value of Gx is between 0 and Gi.
  • the adjustment control unit 13 includes:
  • the adjustment voltage obtaining unit 130 is configured to obtain the output power supply positive voltage after the current region adjustment according to the following formula:
  • OVDD' OVDD-(V Gi -V 255 )
  • OVDD' is the positive voltage of the output power supply after the current area is adjusted
  • OVDD is the positive voltage of the original output power supply in the current area
  • V Gi is the original output power supply positive voltage corresponding to the gray level Gi
  • V 255 is the original corresponding to the gray level 255.
  • the adjusting unit 131 is configured to control the PMIC module and the GAMMA voltage driving module to output the adjusted output power positive voltage obtained by the adjusting voltage obtaining unit to a current region of the display panel.
  • an image is acquired from the input signal unit by the driving IC module, and when the maximum gray level Gi in the image is greater than a predetermined threshold, all gray levels in the input image signal are mapped, and the gray scales 0 to Gi are mapped.
  • the gray level 0 ⁇ 255 while controlling the PMIC module to reduce OVDD, and adjust the GAMMA voltage, so that the brightness corresponding to the adjusted gray level is the same as the brightness corresponding to the gray level before adjustment; because the output voltage OVDD is lowered, and the PMIC module is at OVDD -OVSS increases efficiency when the cross-voltage is low, so the power saving effect is achieved without changing the brightness of the screen.
  • the input image can be divided into multiple regions, and the OVDD voltage is respectively adjusted for different gray levels of the region, so that the power saving effect can be maximized.
  • the gray level 255 is the highest gray level when the data bit width is 8 bits, and when the data bit width is n bit, the corresponding highest gray level is 2 n -1. It is then necessary to replace the 255 values in all or all of the formulas herein with 2 n -1 values, and the method of the invention can be implemented as well.

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Abstract

一种AMOLED显示器的驱动方法及系统，驱动方法包括如下步骤：将显示器的显示区域从上至下划分成多个区域，每一区域至少包括一行象素(S10)；依次获得每一区域对应的输入图像信号，获得每一区域对应的输入图像信号中的最大灰阶Gi(S11)；当最大灰阶Gi大于一预定阈值时，对输入图像信号中的所有灰阶进行映射，将灰阶0～Gi映射至灰阶0～255(S12)；调节区域对应的输出电源正电压，使调整后的0～255灰阶对应的亮度与调整前的0～Gi对应的亮度相同(S13)，实现低AMOLED跨压，提高PMIC工作效率，并节能省电。

Description

一种AMOLED显示器的驱动方法及系统
本申请要求于2017年8月17日提交中国专利局、申请号为201710707445.7、发明名称为“一种AMOLED显示器的驱动方法及系统”的中国专利申请的优先权，上述专利的全部内容通过引用结合在本申请中。
技术领域
本发明涉及薄膜晶体管(Thin Film Transistor，TFT)技术，特别涉及一种AMOLED显示器的驱动方法及系统。
背景技术
有源矩阵有机发光二极管(Active-matrix Organic Light-Emitting Diode，AMOLED)显示技术相对于再用的LCD显示技术，其无需背光，由电流直接驱动有机材料发光，因此可以做到更轻薄，且可视角度更大，并且能明显省电节能。另外其还具有响应速度快，色彩度更饱满，亮度更高耐高低温等优点，故，AMOLED显示技术被业界公认为是继LCD后的新一代显示技术。目前AMOLED显示已越来越多地应用在电视、手机、车载、穿戴等各个显示领域中。
但是，在现有技术中，如何增加PMIC工作效率，以及如何实现进一步的节能省电是一个值得研究的问题。
发明内容
本发明所要解决的技术问题在于，提供一种AMOLED显示器的驱动方法及系统，可以降低AMOLED的跨压，提高PMIC工作效率，从而可实现进一步的节能省电。
为了解决上述技术问题，本发明的实施例的一方面提供了一种AMOLED显示器的驱动方法，包括如下步骤：
将显示器的显示区域从上至下划分成多个区域，每一区域至少包括一行象素；
依次获得每一区域对应的输入图像信号，获得所述区域的输入图像信号 中的最大灰阶Gi；
当所述最大灰阶Gi大于一预定阈值时，对所述输入图像信号中的所有灰阶进行映射，将灰阶0～Gi映射至灰阶0～255；
调节所述区域对应的输出电源正电压，使调整后的0～255灰阶对应的亮度与调整前的0～Gi对应的亮度相同。
其中，所述对所述输入图像信号中的所有灰阶进行映射，将灰阶0～Gx映射至灰阶0～255的步骤具体为：
根据下述公式计算获得每一灰阶Gx映射后的灰阶G'x：
Figure PCTCN2017116411-appb-000001
其中，Gx的灰度值处于0～Gi的灰度值之间。
其中，所述调节所述区域对应的输出电源正电压，使调整后的0～255灰阶对应的亮度与调整前的0～Gi对应的亮度相同的步骤包括：
根据下述公式获得当前区域调节后的输出电源正电压：
OVDD’＝OVDD-(V Gi-V 255)
其中，OVDD’为当前区域调节后的输出电源正电压，OVDD为当前区域原输出电源正电压，V Gi为灰阶Gi所对应的原输出电源正电压，V 255为灰阶255所对应的原输出电源正电压；
控制向显示面板的当前区域输出所述获得的调节后的输出电源正电压。
相应地，本发明实施例的另一方面，还提供一种AMOLED显示器的驱动系统，其包括驱动IC模块、GAMMA电压驱动模块、PMIC模块、显示面板以及数据输入单元，其中，所述驱动IC模块包括：
划分单元，用于将显示面板的显示区域从上至下划分成多个区域，每一区域至少包括一行象素；
最大灰阶获得单元，用于从数据输入单元依次获得每一区域对应的输入图像信号，获得所述区域的输入图像信号中的最大灰阶Gi；
灰阶映射单元，用于当所述最大灰阶Gi大于一预定阈值时，对所述输入图像信号中的所有灰阶进行映射，将灰阶0～Gi映射至灰阶0～255；
调节控制单元，用于调节所述区域对应的输出电源正电压，使调整后的 0～255灰阶对应的亮度与调整前的0～Gi对应的亮度相同。
其中，所述灰阶映射单元包括：
计算单元，用于根据下述公式计算获得每一灰阶Gx映射后的灰阶G'x：
Figure PCTCN2017116411-appb-000002
其中，Gx的灰度值处于0～Gi的灰度值之间。
其中，所述调节控制单元包括：
调节电压获得单元，用于根据下述公式获得当前区域调节后的输出电源正电压：
OVDD’＝OVDD-(V Gi-V 255)
其中，OVDD’为当前区域调节后的输出电源正电压，OVDD为当前区域原输出电源正电压，V Gi为灰阶Gi所对应的原输出电源正电压，V 255为灰阶255所对应的原输出电源正电压；
调节单元，用于控制PMIC模块和GAMMA电压驱动模块向显示面板的当前区域输出所述调节电压获得单元获得的调节后的输出电源正电压。
实施本发明实施例，具有如下有益效果：
在本发明实施例中，通过驱动IC模块从输入信号单元获取图像，在图像中最大灰阶Gi大于一预定阈值时，对输入图像信号中的所有灰阶进行映射，将灰阶0～Gi映射至灰阶0～255，同时控制PMIC模块降低OVDD，并调节GAMMA电压，使调整后的灰阶对应的亮度与调整前灰阶对应的亮度相同；由于降低了输出电压OVDD，而PMIC模块在OVDD-OVSS跨压较低的情况下工作效率增加，因此在不改变屏幕亮度的情况下达到省电的效果。
同时，在本发明实施例中，可以将输入图像划分为多个区域，针对不同区域灰阶分别调整OVDD电压，可以使省电作用最大化。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面 描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。
图1是本发明提供的一种AMOLED显示器的驱动方法的一个实施例的主流程示意图；
图2是对应于图1的更详细的流程示意图；
图3是图1中涉及的将显示器的显示区域进行划分的示意图；
图4是图1中进行灰阶映射的示意图；
图5是本发明提供的一种AMOLED显示器的驱动系统的一个实施例的结构示意图；
图6是图5中驱动IC模块的结构示意图；
图7是图5中调节控制单元的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚完整地描述，显然，所描述的实施例仅仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其它实施例，都属于本发明保护的范围。
此外，以下各实施例的说明是参考附加的图示，用以例示本发明可用以实施的特定实施例。本发明中所提到的方向用语，例如，“上”、“下”、“前”、“后”、“左”、“右”、“内”、“外”、“侧面”等，仅是参考附加图式的方向，因此，使用的方向用语是为了更好、更清楚地说明及理解本发明，而不是指示或暗指所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸地连接，或者一体地连接，可以是机械连接，可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本发明中的具体含义。
此外，在本发明的描述中，除非另有说明，“多个”的含义是两个或两个以上。若本说明书中出现“工序”的用语，其不仅是指独立的工序，在与其它工序无法明确区别时，只要能实现该工序所预期的作用则也包括在本用语中。另外，本说明书中用
Figure PCTCN2017116411-appb-000003
表示的数值范围是指将
Figure PCTCN2017116411-appb-000004
前后记载的数值分别作为最小值及最大值包括在内的范围。在附图中，结构相似或相同的用相同的标号表示。
请参照图1所示，示出了本发明提供的一种AMOLED显示器的驱动方法一个实施例的流程示意图；并请一并结合图2至图4所示。在该实施例中，该AMOLED显示器的驱动方法，包括如下步骤：
步骤S10，将显示器的显示区域从上至下划分成多个区域，每一区域至少包括一行象素；
步骤S11，依次获得每一区域对应的输入图像信号，获得所述区域的输入图像信号中的最大灰阶Gi；
步骤S12，当所述最大灰阶Gi大于一预定阈值时，对所述输入图像信号中的所有灰阶进行映射，将灰阶0～Gi映射至灰阶0～255；
在一个例子中，该步骤S12具体为：根据下述公式计算获得每一灰阶Gx映射后的灰阶G'x：
Figure PCTCN2017116411-appb-000005
其中，Gx的灰度值处于0～Gi的灰度值之间。
步骤S13，调节所述区域对应的输出电源正电压，使调整后的0～255灰阶对应的亮度与调整前的0～Gi对应的亮度相同。
在一个例子中，该步骤S13为包括：
通过下述公式获得当前区域调节后的输出电源正电压：
OVDD’＝OVDD-(V Gi-V 255)
其中，OVDD’为当前区域调节后的输出电源正电压，OVDD为当前区域原输出电源正电压，V Gi为灰阶Gi所对应的原输出电源正电压，V 255为灰阶255所对应的原输出电源正电压；
用于控制向显示面板的当前区域输出所述获得的调节后的输出电源正 电压。
为便于理解，下述将结合图2至图4，来进一步说明本发明的工作原理以及步骤S12和步骤S13中两个公式的来源。
图2给出本发明的详细的工作流程。图像输入时，将图像划分为多个区域(可参见图3)，AMOLED显示器中的驱动IC模块获得第i个区域内的最大灰阶Gi。为防止AMOLED器件跨压(OVDD-OVSS)太小导致无法正常工作的情况，其中，OVSS为输出电源负电压，则当Gi小于预先定义的阈值灰阶G th时，不进行降压操作。当Gi>G th时，将灰阶0～Gi映射至0～255，具体的映射过程可以结合图4进行说明如下：
1)将灰阶Gi映射至255：
Gi→255
其中，图4两个图示中，左侧的图示对应映射前的信息，右侧的图示对应映射后的信息，纵坐标为亮度值，横坐标为灰阶值。
2)映射前后亮度不变，故：
Figure PCTCN2017116411-appb-000006
其中，V 255为映射前灰度值255对应的亮度；L' 255为映射后灰底值255对应的最大亮度；可以理解的是，公式中的2.2为本文示例的GAMMA指数，在其他实施例中，也可以采用其他值。
3)L' 255为映射后的最大亮度，对于映射前低于Gi的灰阶Gx，其亮度Lx为：
Figure PCTCN2017116411-appb-000007
4)结合两式，可得映射后的灰阶：
Figure PCTCN2017116411-appb-000008
其中，对于经过V th补偿过的像素电路，可知流经AMOLED的电流与电 压的关系如下：
I OLED＝k(OVDD-V data) 2
其中，V data为某一图像数据对应的电压值，而k为一固定的系数值；当V data由V Gi变为V 255，为保持I OLED不变，则OVDD也需要进行相应改变：
k(OVDD-V Gi) 2＝k(OVDD’-V 255) 2
可以得到改变后的OVDD’为：
OVDD’＝OVDD-(V Gi-V 255)
AMOLED显示器中的驱动IC模块给PMIC模块(电源管理模块)发送指令，将OVDD调整至改变后的电压，然后将映射后的灰阶电压送出至显示面板的i区域，然后处理下一个区域的数据。
可以理解的是，AMOLED显示器中的驱动IC模块从输入信号获取图像，同时得到图像的最大灰阶Gx。当Gx<255时，可将Gx映射至255灰阶输出，同时控制PMIC降低OVDD，使调整后的255灰阶对应的亮度与调整前的Gx相同。同时对原图像中小于Gx的灰阶进行映射处理，使原灰阶对应的亮度保持不变。这样，由于输出电压OVDD有所降低，而PMIC模块在OVDD-OVSS跨压较低的情况下工作效率会增加，因此在不改变屏幕亮度的情况下可以达到省电的效果。
同时，驱动IC模块将输入图像按照附图3划分为多个区域，使各个区域内OVDD降低程度不同，实现最大程度的省电。可以理解的是，区域划分的多少可由PMIC模块响应速度决定，如果PMIC模块响应速度越快，则可划分的区域越多，若PMIC模块响应速度足够快，可使每行象素的OVDD均不相同。
相应地，如图5所示，示出了本发明提供的一种AMOLED显示器的驱动系统的一个实施例的结构示意图；并请同时结合图6至图7，在本实施例中，该AMOLED显示器的驱动系统，其包括驱动IC模块、GAMMA电压 驱动模块、PMIC模块、显示面板以及数据输入单元，其中，所述驱动IC模块1进一步包括：
划分单元10，用于将显示面板的显示区域从上至下划分成多个区域，每一区域至少包括一行象素；
最大灰阶获得单元11，用于从数据输入单元依次获得每一区域对应的输入图像信号，获得所述区域的输入图像信号中的最大灰阶Gi；
灰阶映射单元12，用于当所述最大灰阶Gi大于一预定阈值时，对所述输入图像信号中的所有灰阶进行映射，将灰阶0～Gi映射至灰阶0～255；
调节控制单元13，用于调节所述区域对应的输出电源正电压，使调整后的0～255灰阶对应的亮度与调整前的0～Gi对应的亮度相同。
其中，所述灰阶映射单元12包括：
计算单元(未画出)，用于根据下述公式计算获得每一灰阶Gx映射后的灰阶G'x：
Figure PCTCN2017116411-appb-000009
其中，Gx的灰度值处于0～Gi的灰度值之间。
其中，所述调节控制单元13包括：
调节电压获得单元130，用于根据下述公式获得当前区域调节后的输出电源正电压：
OVDD'＝OVDD-(V Gi-V 255)
其中，OVDD'为当前区域调节后的输出电源正电压，OVDD为当前区域原输出电源正电压，V Gi为灰阶Gi所对应的原输出电源正电压，V 255为灰阶255所对应的原输出电源正电压；
调节单元131，用于控制PMIC模块和GAMMA电压驱动模块向显示面板的当前区域输出所述调节电压获得单元获得的调节后的输出电源正电压。
更多细节，可以参照前述对图1至图4的描述，在此不进行详述。
实施本发明实施例，具有如下有益效果：
在本发明实施例中，通过驱动IC模块从输入信号单元获取图像，在图像中最大灰阶Gi大于一预定阈值时，对输入图像信号中的所有灰阶进行映 射，将灰阶0～Gi映射至灰阶0～255，同时控制PMIC模块降低OVDD，并调节GAMMA电压，使调整后的灰阶对应的亮度与调整前灰阶对应的亮度相同；由于降低了输出电压OVDD，而PMIC模块在OVDD-OVSS跨压较低的情况下工作效率增加，因此在不改变屏幕亮度的情况下达到省电的效果。
同时，在本发明实施例中，可以将输入图像划分为多个区域，针对不同区域灰阶分别调整OVDD电压，可以使省电作用最大化。
同时，可以理解的是，在本发明实施例中，其中，灰阶255为数据位宽为8bit时的最高灰阶，当数据位宽为n bit时，对应最高灰阶为2 n-1，则需要将本文中所有公式中或提及的255值均替换为2 n-1值，同样可以实现本发明的方法。
以上所揭露的仅为本发明较佳实施例而已，当然不能以此来限定本发明之权利范围，因此等同变化，仍属本发明所涵盖的范围。

Claims (7)

  1. 一种AMOLED显示器的驱动方法，其中，包括如下步骤：
    将显示器的显示区域从上至下划分成多个区域，每一区域至少包括一行象素；
    依次获得每一区域对应的输入图像信号，获得所述区域的输入图像信号中的最大灰阶Gi；
    当所述最大灰阶Gi大于一预定阈值时，对所述输入图像信号中的所有灰阶进行映射，将灰阶0～Gi映射至灰阶0～255；
    调节所述区域对应的输出电源正电压，使调整后的0～255灰阶对应的亮度与调整前的0～Gi对应的亮度相同。
  2. 如权利要求1所述的一种AMOLED显示器的驱动方法，其中，所述对所述输入图像信号中的所有灰阶进行映射，将灰阶0～Gx映射至灰阶0～255的步骤具体为：
    根据下述公式计算获得每一灰阶Gx映射后的灰阶G′x：
    Figure PCTCN2017116411-appb-100001
    其中，Gx的灰度值处于0～Gi的灰度值之间。
  3. 如权利要求1所述的一种AMOLED显示器的驱动方法，其中，所述调节所述区域对应的输出电源正电压，使调整后的0～255灰阶对应的亮度与调整前的0～Gi对应的亮度相同的步骤包括：
    根据下述公式获得当前区域调节后的输出电源正电压：
    OVDD’＝OVDD-(V Gi-V 255)
    其中，OVDD’为当前区域调节后的输出电源正电压，OVDD为当前区域原输出电源正电压，V Gi为灰阶Gi所对应的原输出电源正电压，V 255为灰阶255所对应的原输出电源正电压；
    控制向显示面板的当前区域输出所述获得的调节后的输出电源正电压。
  4. 如权利要求2所述的一种AMOLED显示器的驱动方法，其中，所述调节所述区域对应的输出电源正电压，使调整后的0～255灰阶对应的亮度与调整前的0～Gi对应的亮度相同的步骤包括：
    根据下述公式获得当前区域调节后的输出电源正电压：
    OVDD’＝OVDD-(V Gi-V 255)
    其中，OVDD’为当前区域调节后的输出电源正电压，OVDD为当前区域原输出电源正电压，V Gi为灰阶Gi所对应的原输出电源正电压，V 255为灰阶255所对应的原输出电源正电压；
    控制向显示面板的当前区域输出所述获得的调节后的输出电源正电压。
  5. 一种AMOLED显示器的驱动系统，其包括驱动IC模块、GAMMA电压驱动模块、PMIC模块、显示面板以及数据输入单元，其中：
    所述驱动IC模块包括：
    划分单元，用于将显示面板的显示区域从上至下划分成多个区域，每一区域至少包括一行象素；
    最大灰阶获得单元，用于从数据输入单元依次获得每一区域对应的输入图像信号，获得所述区域的输入图像信号中的最大灰阶Gi；
    灰阶映射单元，用于当所述最大灰阶Gi大于一预定阈值时，对所述输入图像信号中的所有灰阶进行映射，将灰阶0～Gi映射至灰阶0～255；
    调节控制单元，用于调节所述区域对应的输出电源正电压，使调整后的0～255灰阶对应的亮度与调整前的0～Gi对应的亮度相同。
  6. 如权利要求5所述的一种AMOLED显示器的驱动系统，其中，所述灰阶映射单元包括：
    计算单元，用于根据下述公式计算获得每一灰阶Gx映射后的灰阶G′x：
    Figure PCTCN2017116411-appb-100002
    其中，Gx的灰度值处于0～Gi的灰度值之间。
  7. 如权利要求6所述的一种AMOLED显示器的驱动系统，其中，所述调节控制单元包括：
    调节电压获得单元，用于根据下述公式获得当前区域调节后的输出电源正电压：
    OVDD’＝OVDD-(V Gi-V 255)
    其中，OVDD’为当前区域调节后的输出电源正电压，OVDD为当前区域原输出电源正电压，V Gi为灰阶Gi所对应的原输出电源正电压，V 255为灰阶255所对应的原输出电源正电压；
    调节单元，用于控制PMIC模块和GAMMA电压驱动模块向显示面板的当前区域输出所述调节电压获得单元获得的调节后的输出电源正电压。
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CN106991972A (zh) * 2017-05-02 2017-07-28 深圳市华星光电技术有限公司 一种有机发光面板的开机亮度控制方法
CN107331350A (zh) * 2017-08-17 2017-11-07 武汉华星光电技术有限公司 一种amoled显示器的驱动方法及系统

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