CN109961741A - 有机发光二极管显示设备 - Google Patents

有机发光二极管显示设备 Download PDF

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CN109961741A
CN109961741A CN201811554034.XA CN201811554034A CN109961741A CN 109961741 A CN109961741 A CN 109961741A CN 201811554034 A CN201811554034 A CN 201811554034A CN 109961741 A CN109961741 A CN 109961741A
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sensing
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oled
time
tft
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CN109961741B (zh
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盧东仁
金营镐
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LG Display Co Ltd
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LG Display Co Ltd
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    • 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]
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    • 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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  • Engineering & Computer Science (AREA)
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  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

公开了一种OLED显示设备，该OLED显示设备能够通过独立于每个子像素的充电时间和输入数据关断OLED元件来提高图像质量。根据扫描栅极线和感测栅极线的控制，在发光时间之后和充电时间之前的至少一个OLED关断时间期间将提供给参考线的参考电压提供给OLED元件以关断OLED元件。参考电压低于OLED元件的阈值电压。

Description

有机发光二极管显示设备
相关申请的交叉引用
本申请要求享有2017年12月26日提交的韩国专利申请No.10-2017-0179086的权益，该韩国专利申请通过引用的方式并入本文，就如同该韩国专利申请在本文中被完整阐述一样。
技术领域
本发明涉及一种有机发光二极管显示设备，该有机发光二极管显示设备能够通过独立于每个子像素的充电时间和输入数据关断有机发光二极管元件来提高图像质量。
背景技术
用于显示图像的代表性显示设备包括使用液晶的液晶显示器(LCD)、使用有机发光二极管(OLED)的OLED显示设备、以及使用电泳粒子的电泳显示器(EPD)。
在这些当中，OLED显示设备是一种自发光设备，其通过电子和空穴的重新组合使得有机发光层发光，并且具有高亮度、宽视角、高对比度、以及超薄膜厚度的优点。
构成OLED显示设备的每个子像素包括OLED元件和用于独立驱动OLED元件的像素电路。像素电路根据以下方式调整OLED元件的亮度：驱动薄膜晶体管(TFT)根据与像素数据对应的驱动电压Vgs来调整用于驱动OLED元件的电流Ids。
OLED显示设备已经使用了黑数据***(BDI)方案，在该方案中，通过在每个帧期间对每个子像素中的黑数据进行充电来将用于关断OLED元件的黑帧添加到每个帧中，以便改善运动图像响应时间(MPRT)。
然而，现有技术的BDI方案应该对以时分方式划分成黑帧和图象帧的每个帧进行驱动。在黑帧中，所有子像素按线顺序对黑数据进行充电，以使得OLED元件被关断。在图像帧中，所有子像素按线顺序对像素数据进行充电，以使得OLED元件发光。
这样，因为现有技术的BDI方案应该在一个帧期间通过时分方式输出黑数据和图像数据，所以需要用于额外存储输入图像数据的存储器，并因此制造成本增加。此外，在将每个帧以时分方式划分为黑数据提供时间段和图像数据提供时间段时，如果每个子像素的充电时间不足，则充电电压可以失真，从而生成不同于数据的充电电压并导致图像质量恶化。
发明内容
相应地，本发明涉及一种OLED显示设备，该OLED显示设备实质上消除了由于现有技术的限制和缺点所导致的一个或多个问题。
在各种实施例中，本发明提供了一种OLED显示设备，该OLED显示设备能够通过独立于每个子像素的充电时间和输入数据关断OLED元件来提高图像质量。
在接下来的说明书中部分地阐述了本发明的附加优点、目的、以及特征，并且在本领域普通技术人员研究以下说明书后，本发明的附加优点、目的、以及特征将部分地对本领域普通技术人员变得显而易见或可以部分地从对本发明的实践中获知。可以通过在书面说明书及其权利要求以及附图中特别地指出的结构来实现和获得本发明的目的和其它优点。
为了实现这些目的和其它优点并且根据本发明的目的，如在本文具体表达和概括描述的，OLED显示设备包括：面板，所述面板包括多个子像素，每个子像素连接到任何一条扫描栅极线、任何一条感测栅极线、任何一条数据线、任何一条参考线、以及任何一条电源线；扫描栅极驱动器，被配置为驱动所述扫描栅极线；感测栅极驱动器，被配置为驱动所述感测栅极线；以及数据驱动器，被配置为驱动所述数据线和所述参考线，其中所述子像素根据所述扫描栅极线和所述感测栅极线的控制来在所述子像素的充电时间期间执行充电操作；所述子像素的OLED元件根据所述扫描栅极线和所述感测栅极线的控制来在所述子像素的发光时间期间发光；根据所述扫描栅极线和所述感测栅极线的控制，在所述发光时间之后并且在所述充电时间之前的至少一个OLED关断时间期间，提供给所述参考线的参考电压被提供给所述OLED元件，以关断所述OLED元件，并且所述参考电压低于所述OLED元件的阈值电压。
所述子像素可以包括：驱动薄膜晶体管(TFT)，被配置为根据在存储电容器中充电的驱动电压来驱动所述OLED元件；扫描TFT，被配置为根据所述扫描栅极线的控制来将所述数据线的数据信号提供给所述存储电容器的第一电极；以及感测TFT，被配置为根据所述感测栅极线的控制来将所述参考线的参考电压提供给所述存储电容器的第二电极，其中所述扫描TFT和所述感测TFT在所述充电时间期间被导通，其中所述扫描TFT和所述感测TFT在所述发光时间期间被关断，并且其中所述感测TFT在所述OLED关断时间期间被导通。
在所述充电时间期间，所述扫描TFT和所述感测TFT可以分别地由提供给所述扫描栅极线的扫描脉冲和提供给所述感测栅极线的第一感测脉冲导通，并且在所述OLED关断时间期间，所述感测TFT可以由提供给所述感测栅极线的第二感测脉冲导通。
在每个帧的有效时间期间可以将与所述第一感测脉冲分开所述发光时间的任何一个第二感测脉冲和另一第二感测脉冲中的至少一个提供给所述感测栅极线，所述另一第二感测脉冲位于所述第一感测脉冲的前面并且与所述第一感测脉冲相结合(integrated)。
包括所述多个子像素的多条水平线当中的每条水平线的OLED关断时间可以与其它水平线的充电时间重叠。
分别提供给单独连接到所述多条水平线当中的第一组水平线的第一组感测栅极线的第二感测脉冲可以按线顺序延迟地上升并在所述有效时间的结束时刻同时下降，并且所述第一组水平线中的每条水平线的OLED关断时间可以逐渐减少。
分别提供给所述第一组感测栅极线当中的除了第一感测栅极线以外的感测栅极线的第二感测脉冲可以在所述有效时间的开始时刻同时上升并且与所述第一感测脉冲相结合地按线顺序下降，并且所述第一组水平线中的每条水平线的包括所述充电时间的OLED关断时间可以逐渐增加。
分别提供给单独连接到所述多条水平线当中的第二组水平线的第二组感测栅极线的第二感测脉冲可以按线顺序延迟地上升，并且与所述第一感测相结合地并按线顺序延迟地下降，并且所述第二组水平线的OLED关断时间可以与相对应的充电时间相结合并且可以相等。
在每个帧的空白时间期间，除了由所述扫描栅极驱动器和所述感测栅极驱动器选择的、并且执行感测操作的任意一条水平线之外的水平线的OLED元件可以由于所述扫描TFT和所述感测TFT被关断而保持发光状态。
在紧挨着所述空白时间之前的所述有效时间期间被关断的子像素的OLED元件可以根据在所述OLED元件的关断时间期间保持在所述存储电容器中的驱动电压来在所述空白时间期间发光。
应当理解，对本发明的前述一般性描述和以下详细描述都是示例性和解释性的，并且旨在提供对如所要求保护的本发明的进一步解释。
附图说明
被包括用于提供对本发明进一步理解并被并入本申请中且构成本申请一部分的附图示出了本发明的实施例，并且附图与说明书一起用于解释本发明的原理。在附图中：
图1是示意性示出了根据本发明实施例的OLED显示设备的结构的框图；
图2是示出了根据本发明实施例的像素电路和数据驱动器的部分结构的等效电路图；
图3是示出了根据本发明实施例的每帧的驱动方法的图；
图4是根据本发明实施例的扫描栅极线和感测栅极线的驱动波形图；以及
图5是根据本发明实施例的栅极驱动器的输入信号的波形图。
具体实施方式
现在将详细地参考本发明的示例性实施例，在附图中示出了这些实施例的示例。在任何可能的情况下，将在所有附图中使用相同的附图标记来指代相同或类似的部件。
图1是示意性示出了根据本发明实施例的OLED显示设备的结构的框图。
参考图1，OLED显示设备包括面板100、作为面板驱动器的栅极驱动器200和数据驱动器300、时序控制器400、存储器500、伽玛电压生成器600、以及电源700。
电源700使用输入电压来生成并输出驱动显示设备所需的驱动电压。例如，电源700生成提供给数据驱动器300和时序控制器400的数字电路的驱动电压、提供给数据驱动器300和伽玛电压生成器600的模拟电路的驱动电压、以及用于栅极驱动器200的栅极导通电压(栅极-高电压)和栅极关断电压(栅极-低电压)。电源700还生成驱动面板100所需的多个驱动电压EVDD和EVSS并且还生成参考电压Vref，并通过数据驱动器300将驱动电压和参考电压提供给面板100。
时序控制器400接收来自主机***的图像数据和时序控制信号。主机***可以是计算机、电视***、机顶盒和便携式终端(例如，平板电脑或移动电话)中的任何一个。时序控制信号可以包括点时钟、数据使能信号、垂直同步信号以及水平同步信号。时序控制器400使用从主机***接收的时序控制信号和存储在其中的时序配置信息来生成用于控制数据驱动器300的驱动时序的多个数据控制信号，并将数据控制信号提供给数据驱动器300。时序控制器400生成用于控制栅极驱动器200的驱动时序的多个栅极控制信号，并将栅极控制信号提供给栅极驱动器200。
时序控制器400对从主机***接收的图像源执行各种各样的图像处理，例如用于降低功耗的亮度校正，或图像质量校正。时序控制器400通过对存储在存储器500中的每个子像素P的特征偏差应用补偿值来补偿图像数据，并将补偿后的图像数据提供给数据驱动器300。
时序控制器400可以控制显示设备在感测模式下进行操作。例如，时序控制器400可以控制显示设备在通电时间、断电时间、以及每个帧的垂直空白时间当中的至少一个特定时间在感测模式下进行操作。在感测模式下，时序控制器400可以通过控制栅极驱动器200和数据驱动器300来驱动处于感测模式的面板100，感测用于指示每个子像素P的电气特性(驱动TFT的阈值电压和迁移率)的像素电流，并使用感测结果来更新存储在存储器500中的每个子像素的补偿值。
伽玛电压生成器600生成包括多个具有不同电压电平的不同参考伽马电压的参考伽玛电压集，并将该参考伽玛电压集提供给数据驱动器300。伽玛电压生成器600可以根据时序控制器400的控制来生成与显示设备的伽玛电压特性相对应的多个参考伽玛电压，并将参考伽玛电压提供给数据驱动器300。伽玛电压生成器600可以包括可编程伽玛集成电路(IC)。伽玛电压生成器600可以从时序控制器400接收伽玛数据，根据伽玛数据生成或调整参考伽玛电压电平，并将具有调整过的电压电平的伽玛数据输出到数据驱动器300。
数据驱动器300根据从时序控制器400接收的数据控制信号将从时序控制器400接收的图像数据转换为模拟数据信号，并且将该数据信号提供给面板100的数据线DL1到DLm中的每一条。数据驱动器300接收来自伽玛电压生成器600的多个参考伽玛电压，并将伽玛电压分成多个分别对应于图像数据的灰度值的灰度电压。数据驱动器300使用所分得的灰度电压将图像数据转换为模拟数据信号，并将该数据信号提供给数据线DL1到DLm中的每一条。
数据驱动器300根据时序控制器400的控制来将从电源700接收的参考电压Vref提供给面板100的参考线RL1到RLk。
在感测模式中，数据驱动器300根据时序控制器400的控制将感测数据电压提供给数据线DL1到DLm中的每一条，使得栅极驱动器200选择的子像素P被驱动。此外，数据驱动器300通过参考线RL1到RLk按照电压对指示每个被驱动的子像素P的电气特性的像素电流进行感测，将所感测的电流转换为数字感测数据，并将数字感测数据提供给时序控制器400。
数据驱动器300包括单独安装到覆晶薄膜(chip-on-film，COF)上的多个数据IC，使得数据驱动器300可以键合并连接到面板100。
栅极驱动器200使用从时序控制器400接收的多个栅极控制信号来单独地驱动面板100的扫描栅极线GLsc1到GLsc(n)和感测栅极线GLse1到GLse(n)。栅极驱动器200在每条栅极线的驱动时间段期间将栅极导通电压VGH提供给相对应的栅极线，并且在每条栅极线的非驱动时间段期间将栅极关断电压VGL提供给相对应的栅极线。栅极驱动器200包括单独安装到COF上的多个栅极IC，以使得栅极驱动器200被键合并连接到面板100。同时，栅极驱动器200可以与面板100的像素阵列的TFT阵列一起直接形成在基板上，并且可以形成为嵌入到面板100中的面板内栅极(GIP)类型。
栅极驱动器200包括扫描栅极驱动器210和感测栅极驱动器220，扫描栅极驱动器210根据时序控制器400的控制来单独驱动多条扫描栅极线GLsc1到GLsc(n)，而感测栅极驱动器220根据时序控制器400的控制来单独驱动多条感测栅极线GLse1到GLse(n)。扫描栅极驱动器210包括扫描移位寄存器，扫描移位寄存器包括分别连接到多条扫描栅极线GLsc1到GLsc(n)的多个扫描级，并根据时序控制器400的控制来执行移位操作。感测栅极驱动器220包括感测移位寄存器，感测移位寄存器包括分别连接到多条感测栅极线GLse1到GLse(n)的多个感测级，并且根据时序控制器400的控制来执行移位操作。
扫描栅极驱动器210和感测栅极驱动器220通过在每个帧中按线顺序驱动扫描栅极线GLsc1到GLsc(n)和感测栅极线GLse1到GLse(n)来确定水平线HL单元中的子像素P的充电时间。
特别地，感测栅极驱动器220通过在每个帧中按线顺序驱动感测栅极线GLse1到GLse(n)来确定水平线HL单元中的子像素P的OLED元件关断时间，而不减少子像素P的充电时间。
面板100通过像素阵列显示图像，该像素阵列包括以矩阵形式排列的子像素P。基本像素可以包括至少三个子像素，该至少三个子像素能够通过在白色(W)子像素、红色(R)子像素、绿色(G)子像素和蓝色(B)子像素之间进行颜色混合来表示白色。例如，基本像素可以包括R/G/B子像素或W/R/G/B子像素。基本像素可以包括R/G/B子像素、W/R/G子像素、B/W/R子像素或G/B/W子像素。
沿X轴和Y轴方向排列的子像素P构成多条水平线HL1到HLn。沿X轴方向排列的每条水平线HL的子像素P共同连接到扫描栅极线GLsc和感测栅极线GLse。沿Y轴方向排列的每一列的子像素P共同连接到每条数据线DL。每列或多列的子像素P可以共同连接到参考线RL和电源线PL。例如，如图1所示，4列子像素P可以共同连接到参考线RL，并且4列子像素可以共同连接到电源线PL。
根据扫描栅极线GLsc1到GLsc(n)和感测栅极线GLse1到GLse(n)的控制，在每个帧中按线顺序驱动多条水平线HL1到HLn的子像素P，以对数据充电，并且OLED元件根据所充电的数据发光，以显示图像。
在每个帧中，在发光时间之后并且在充电时间之前的至少一个特定时间，多条水平线HL1到HLn的子像素P通过根据感测栅极线GLse1到GLse(n)的控制将低于OLED元件的阈值电压Vth的参考电压Vref经由参考线RL1到RLk施加给OLED元件来关断OLED元件，由此实现黑帧。因此，可以改善MPRT。
特别地，由每条感测栅极线GLse控制的每条水平线HL的OLED关断时间可以与其它多条水平线HL的充电时间重叠并且使用参考电压Vref，以使得OLED元件可以被关断，而与子像素P的充电时间和输入数据无关。
图2是示出了根据本发明实施例的像素电路和数据驱动器的部分结构的等效电路图。将结合图1来给出对图2的描述。
参照图2，连接在高电位电源(下文，EVDD)线PL和低电位电源(下文，EVSS)线之间的每个子像素P包括OLED元件10、以及像素电路，该像素电路包括扫描TFT ST1和感测TFTST2、驱动TFT DT、以及用于独立驱动OLED元件10的存储电容器Cst。
扫描TFT ST1、感测TFT ST2和驱动TFT DT可以使用非晶硅(a-Si)TFT、多晶硅(poly-Si)TFT、氧化物TFT或有机TFT。
OLED元件10包括连接到驱动TFT DT的源极节点N2的阳极、连接到EVSS线的阴极、以及在阳极和阴极之间连接的有机发光层。尽管阳极相对于每个子像素是独立形成的，但是阴极可以是由所有子像素共用的共同电极。如果驱动TFT DT将驱动电流提供给OLED元件10，则电子和空穴分别从阴极和阳极注入到有机发光层中并在有机发光层中重新组合，从而使得OLED元件10通过涂上荧光或磷光材料来发光，光的亮度与驱动电流的电流值成比例。
扫描TFT ST1根据由扫描栅极驱动器210提供给扫描栅极线GLsc的扫描栅极信号SCAN而被导通，并且将由数据驱动器300提供给数据线的数据电压Vdata提供给驱动TFT DT的栅极节点N1。
感测TFT ST2根据由感测栅极驱动器220提供给感测栅极线GLse的感测栅极信号SENSE而被导通，并且将由数据驱动器300提供给参考线RL的参考电压Vref提供给驱动TFTDT的源极节点N2。参考电压Vref小于OLED元件10的阈值电压Vth。在感测到子像素P的特性后，感测TFT ST2进一步将从驱动TFT DT接收的电流输出到浮置状态的参考线RL。
连接在驱动TFT DT的栅极节点N1和源极节点N2之间的存储电容器Cst将通过导通的扫描TFT ST1和感测TFT ST2分别提供给驱动TFT DT的栅极节点N1和源极节点N2的数据电压Vdata和参考电压Vref之间的差电压充电成驱动电压Vgs，在扫描TFT ST1和感测TFTST2被关断的发光时间期间保持所充电的驱动电压Vgs，并将驱动电压Vgs提供给驱动TFTDT。
驱动TFT DT根据存储电容器Cst的驱动电压Vgs控制从EVDD线PL接收的电流并且将电流提供给OLED元件10，以使得OLED元件10发光。
在感测模式下，数据驱动器300通过数模转换器(DAC)将从时序控制器400接收的感测数据转换为感测数据电压Vdata，并将数据电压Vdata提供给数据线DL。数据驱动器300通过预充电开关SPRE将参考电压Vref提供给参考线RL。此后，预充电开关SPRE被关断。驱动TFT DT由通过扫描TFT ST1提供的感测数据电压Vdata与通过感测TFT ST2提供的参考电压Vref之间的差电压来驱动。通过感测TFT ST2将反映驱动TFT DT的特性(例如，驱动TFT DT的阈值电压Vth和迁移率)的电流充电为浮置状态的参考线RL的线电容器中的电压。模数转换器(ADC)通过采样开关SAM接收在参考线RL中充电的电压，将充电电压转换为每个子像素P的感测数据，并将感测数据输出到时序控制器400。可以在通电时间、垂直空白时间或断电时间当中的至少一个时间运行这种感测模式。
在显示模式下，数据驱动器300通过DAC将从时序控制器400接收的图像数据转换为数据电压Vdata，将数据电压Vdata提供给数据线，并且通过预充电开关SPRE将参考电压Vref提供给参考线RL。在扫描TFT ST1和感测TFT ST2导通的充电时间期间，驱动电压Vgs(其是数据电压Vdata和参考电压Vref之间的差)被充电在存储电容器Cst中。在扫描TFTST1和感测TFT ST2关断的发光时间期间，驱动TFT DT根据在存储电容器Cst中保持的驱动电压来驱动OLED元件10，以使得OLED元件发光。在子像素P的发光时间之后和子像素P的充电时间之前的至少一个特定时间，只有感测TFT ST2被导通，并且低于OLED元件10的阈值电压Vth的参考电压Vref被提供给OLED元件10，以使得OLED元件10被关断。
通过这种方式，由于OLED元件10是使用感测TFT ST2和参考线RL来关断的并且与输入数据和充电时间无关，因此可以通过实施黑帧来改善MPRT，并且可以通过充分地保证子像素P的充电时间来改善图像质量。
图3是示出了根据本发明实施例的每个帧的驱动方法的图。
参照图3，当在每个帧的有效时间期间按照线顺序扫描n条水平线HL1到HLn时，每个子像素充电与数据相对应的驱动电压，并且在随后的发光时间期间OLED元件导通并且发光。
在每个帧的有效时间期间，在第i条水平线HLi到第n条水平线HLn被顺序充电时，第一条水平线HL1到第i条水平线HLi的OLED元件通过在发光时间之后和垂直空白时间之前的特定时间导通的感测TFT来接收参考电压并且被关断。在这种情况下，由于第一条水平线HL1到第i条水平线HLi的OLED关断时间通过按线顺序延迟地开始并且在有效时间的结束时刻同时结束，因此OLED关断时间逐渐减少。
在每个帧的有效时间期间，除了第一条水平线HL1之外的第二条水平线HL2到第n条水平线HLn的OLED元件通过在按线顺序给出的充电时间之前的特定时间导通的感测TFT来接收参考电压并且被关断。在这种情况下，由于第二条水平线HL2到第i条水平线HLi的OLED关断时间在有效时间的开始时刻同时开始并且在按线顺序延迟的充电时间的开始时刻结束，因此OLED关断时间逐渐增加。
在每个帧的有效时间期间，由于第i条水平线HLi到第n条水平线HLn的OLED关断时间通过按线顺序延迟地开始并且在按线顺序延迟的充电时间的开始时刻结束，因此OLED关断时间是相等的。
所有子像素具有相等的充电时间和相等的发光时间。所有子像素的OLED关断持续时间也是相同的。
在每个帧的垂直空白时间期间，由于栅极驱动器选择的任意一条水平线被感测并且扫描TFT和感测TFT都被关断，因此其它水平线的OLED元件根据在存储电容器中保持的驱动电压而保持发光状态。同时，在垂直空白时间之前的有效时间期间，在非感测线中，通过经由感测TFT接收的参考电压Vref而关断的子像素的OLED元件根据由于扫描TFT和感测TFT二者在垂直空白时间都被关断而在OLED关断时间期间在存储电容器中保持的驱动电压而发光。
图4是根据本发明实施例的扫描栅极线和感测栅极线的驱动波形图。将结合图1和图2来给出对图4的描述。
参照图4，在一个帧的有效时间期间，数据驱动器300在一个水平(1H)周期的单位中将数据信号Vdata提供给数据线DL1到DLm，并且通过预充电开关SPRE将低于OLED元件的阈值电压Vth的参考电压Vref提供给参考线RL1到RLk。
扫描栅极驱动器210按线顺序提供扫描脉冲21来作为分别提供给扫描栅极线GLsc1到GLsc(n)的扫描栅极信号SCAN1到SCANn，从而按顺序驱动扫描栅极线GLsc1到GLsc(n)。感测栅极驱动器220按线顺序提供与扫描脉冲21同步的第一感测脉冲22来作为分别提供给感测栅极线GLse1到GLse(n)的感测栅极信号SENSE1到SENSEn，从而按顺序驱动感测栅极线GLse1到GLse(n)。因此，每条水平线HL的子像素在充电时间C(在充电时间C期间，扫描TFT和感测TFT被导通)期间充电一驱动电压，并且OLED元件在发光时间(在发光时间期间，扫描TFT和感测TFT被关断)期间根据充电电压而发光。
感测栅极驱动器220在每条水平线HL的发光时间之后并且在充电时间C之前的任一特定时刻提供第二感测脉冲23来作为感测栅极信号SENSE。因此，被提供了第二感测脉冲23的水平线HL的OLED元件通过经由导通的感测TFT接收低于阈值电压Vth的参考电压Vref而被关断。可以通过调整第二感测脉冲23的脉冲宽度来控制OLED关断时间。
参照图4，例如，在每个帧的有效时间期间，第一扫描栅极信号SCAN1到第n扫描栅极信号SCAN(n)以及第一感测栅极信号SENSE1到第n感测栅极信号SENSE(n)按线顺序提供扫描脉冲21和第一感测脉冲22，以使得第一条水平线HL1到第n条水平线HLn的子像素按顺序被充电，并且OLED元件在随后的发光时间期间根据充电电压来发光。
在扫描脉冲21和第一感测脉冲22按线顺序被提供给第(n/2)扫描栅极信号SCAN(n/2)到第n扫描栅极信号SCAN(n)以及第(n/2)感测栅极信号SENSE(n/2)到第n感测栅极信号SENSE(n)的充电时间C期间，第一感测栅极信号SENSE1到第(n/2-1)感测栅极信号SENSE(n/2-1)按线顺序提供第二感测脉冲23，并且相应的水平线HL1到HL(n/2-1)的OLED元件通过经由在发光时间后的特定时间导通的感测TFT来接收参考电压Vref而被关断。第一感测栅极信号SENSE1到第(n/2-1)感测栅极信号SENSE(n/2-1)的第二感测脉冲23按线顺序延迟地上升，并且在有效时间的结束时刻同时下降。因此，相应水平线HL1到HL(n/2-1)的OLED关断时间逐渐减少。
在扫描脉冲21和第一感测脉冲22按线顺序被提供给第二扫描栅极信号SCAN2到第n扫描栅极信号SCAN(n)和第二感测栅极信号SENSE2到第n感测栅极信号SENSE(n)的充电时间C之前的特定时间，第二感测栅极信号SENSE2到第n感测栅极信号SENSE(n)提供第二感测脉冲23，以使得相应水平线HL1到HL(n/2-1)的OLED元件通过经由在充电时间C之前的特定时间导通的感测TFT来接收参考电压Vref而被关断。第二感测栅极信号SENSE2到第n感测栅极信号SENSE(n)的第二感测脉冲23通过与在第二感测脉冲23之后的第一感测脉冲22相结合地被提供。即使在扫描脉冲21和第一感测脉冲22被提供的充电时间C期间，由于OLED元件被关断，因此OLED元件在第二感测脉冲23和第一感测脉冲22的结合时间期间被关断。
由于第二感测栅极信号SENSE2到第(n/2)感测栅极信号SENSE(n/2)的第二感测脉冲23在有效时间的开始时刻同时上升并且通过与按线顺序延迟的第一感测脉冲22相结合地按线顺序下降，因此相应水平线HL2到HL(n/2)(包括第一条水平线HL1)的OLED关断时间逐渐增加。
由于第(n/2+1)感测栅极信号SENSE(n/2+1)到第n感测栅极信号SENSE(n)的第二感测脉冲23在有效时间期间按线顺序延迟地上升并且通过与按线顺序延迟的第一感测脉冲22相结合地按线顺序下降，因此相应水平线HL(n/2+1)到HL(n)的OLED关断时间是相等的。
在垂直空白时间期间，执行对由扫描栅极驱动器210和感测栅极驱动器220选择的任一条水平线的子像素的感测操作。在感测数据电压Vdata_se和参考电压Vref的充电时间之前，预充电开关SPRE被导通，并且然后预充电开关SPRE被关断并且参考线RL浮置。在垂直空白时间的充电时间期间提供的参考电压Vref可以等于或低于在有效时间期间提供的参考电压Vref。由于被提供了感测数据电压Vdata_se和参考电压Vref的子像素的驱动TFT DT被驱动，并且通过感测TFT ST2将反映驱动TFT DT的特性的电流作为电压被充电在浮置状态的参考线RL的线电容器中，因此参考线RL的电压逐渐上升。采样开关SAM在所需的感测时间被导通，并且参考线RL中充电的电压被提供给ADC。ADC将所充电的电压转换为感测数据，并将感测数据输出到时序控制器400。恢复数据电压Vdata和参考电压Vref还提供给所感测的子像素并且然后被保持，以使得所感测的子像素与未被感测的其它子像素类似地被恢复到驱动电压的保持状态。
图5是根据本发明实施例的栅极驱动器的输入信号的波形图。
参照图5，图1所示的扫描栅极驱动器210在每个水平周期期间根据栅极移位时钟GSC来顺序地对第一栅极开始脉冲GSP_SCAN进行移位，以使得图4所示的扫描栅极信号SCAN1到SCAN(n)的扫描脉冲21被分别提供给扫描栅极线GLsc1到GLsc(n)。在第一水平周期之前的持续时间期间，第一栅极开始脉冲GSP_SCAN可以被提供与扫描脉冲21相同的脉冲宽度。
感测栅极驱动器220在每个水平周期期间根据栅极移位时钟GSC来顺序地对第二栅极开始脉冲GSP_SENSE进行移位，以将图4所示的感测栅极信号SENSE1到SENSE(n)的第一感测脉冲22和第二感测脉冲23提供给感测栅极线GLse1到GLse(n)。第二栅极开始脉冲GSP_SENSE的第一脉冲32被提供与第一感测脉冲22相同的脉冲宽度并与第一栅极开始脉冲GSP_SCAN同步地被提供。第二栅极开始脉冲GSP_SENSE的第二脉冲33可以被提供与第二感测脉冲23相同的脉冲宽度。第二脉冲23的脉冲宽度可以被调整。可以通过第二脉冲33的脉冲宽度来确定第二感测脉冲23的脉冲宽度，以使得可以控制OLED元件的关断时间。
通过这种方式，根据实施例的OLED显示设备和驱动该OLED显示设备的方法通过独立于充电时间和输入数据使用感测TFT和参考线关断OLED元件来实施黑帧，以使得可以改善MPRT，并且可以通过充分地保证子像素的充电时间来改善图像质量。
另外，根据实施例的OLED显示设备和驱动该OLED显示设备的方法不需要提供黑数据，从而不需要用于存储输入图像数据的额外存储器，并由此与常规的显示设备相比可以降低制造成本。
如上所述，在根据本发明实施例的OLED显示设备中，在每个帧的有效时间期间每个子像素充电与数据相对应的驱动电压，并且在发光时间(在发光时间期间，OLED元件通过驱动TFT而发光)之后并且在充电时间之前的至少一个特定时间每个子像素使用感测TFT和参考线关断OLED元件。相应地，可以通过独立于充电时间和输入数据实施黑帧来改善MPRT，并且可以通过充分地保证每个子像素的充电时间来改善图像质量。
对本领域技术人员而言显而易见的是，可以对本发明进行各种各样的修改和改变，而不会偏离本发明的精神和范围。因此，应当预期到，本发明涵盖本发明的各种修改和改变，只要它们落入所附权利要求及其等同要件的范围内。

Claims (10)

1.一种有机发光二极管(OLED)显示设备，包括：
面板，所述面板包括多个子像素，每个子像素连接到任何一条扫描栅极线、任何一条感测栅极线、任何一条数据线、任何一条参考线、以及任何一条电源线；
扫描栅极驱动器，被配置为驱动所述扫描栅极线；
感测栅极驱动器，被配置为驱动所述感测栅极线；以及
数据驱动器，被配置为驱动所述数据线和所述参考线，
其中，所述子像素根据所述扫描栅极线和所述感测栅极线的控制来在所述子像素的充电时间期间执行充电操作，
所述子像素的OLED元件根据所述扫描栅极线和所述感测栅极线的控制来在所述子像素的发光时间期间发光，
根据所述扫描栅极线和所述感测栅极线的控制，在所述发光时间之后并且在所述充电时间之前的至少一个OLED关断时间期间，提供给所述参考线的参考电压被提供给所述OLED元件，以关断所述OLED元件，并且
所述参考电压低于所述OLED元件的阈值电压。
2.根据权利要求1所述的OLED显示设备，其中，所述子像素包括：
驱动薄膜晶体管(TFT)，被配置为根据在存储电容器中充电的驱动电压来驱动所述OLED元件；
扫描TFT，被配置为根据所述扫描栅极线的控制来将所述数据线的数据信号提供给所述存储电容器的第一电极；以及
感测TFT，被配置为根据所述感测栅极线的控制来将所述参考线的所述参考电压提供给所述存储电容器的第二电极，
其中，所述扫描TFT和所述感测TFT在所述充电时间期间导通，
其中，所述扫描TFT和所述感测TFT在所述发光时间期间关断，并且
其中，所述感测TFT在所述OLED关断时间期间导通。
3.根据权利要求2所述的OLED显示设备，其中，在所述充电时间期间，所述扫描TFT和所述感测TFT由提供给所述扫描栅极线的扫描脉冲和提供给所述感测栅极线的第一感测脉冲导通，并且
其中，在所述OLED关断时间期间，所述感测TFT由提供给所述感测栅极线的第二感测脉冲导通。
4.根据权利要求3所述的OLED显示设备，其中，在每个帧的有效时间期间将与所述第一感测脉冲分开所述发光时间的任何一个第二感测脉冲和另一第二感测脉冲中的至少一个提供给所述感测栅极线，所述另一第二感测脉冲位于所述第一感测脉冲前面并且与所述第一感测脉冲相结合。
5.根据权利要求4所述的OLED显示设备，其中，包括所述多个子像素的多条水平线当中的每条水平线的所述OLED关断时间与其它水平线的充电时间重叠。
6.根据权利要求5所述的OLED显示设备，其中，分别提供给单独连接到所述多条水平线当中的第一组水平线的第一组感测栅极线的第二感测脉冲按线顺序延迟地上升并在所述有效时间的结束时刻同时下降，并且
所述第一组水平线中的每条水平线的所述OLED关断时间逐渐减少。
7.根据权利要求6所述的OLED显示设备，其中，分别提供给所述第一组感测栅极线当中的除了第一感测栅极线以外的感测栅极线的第二感测脉冲在所述有效时间的开始时刻同时上升并且与所述第一感测脉冲相结合地按线顺序下降，并且
所述第一组水平线中的每条水平线的包括所述充电时间的所述OLED关断时间逐渐增加。
8.根据权利要求7所述的OLED显示设备，其中，分别提供给单独连接到所述多条水平线当中的第二组水平线的第二组感测栅极线的第二感测脉冲按线顺序延迟地上升，并且与所述第一感测脉冲相结合地并按线顺序延迟地下降，并且
所述第二组水平线的OLED关断时间与相对应的充电时间相结合并且相等。
9.根据权利要求8所述的OLED显示设备，其中，在每个帧的空白时间期间，除了由所述扫描栅极驱动器和所述感测栅极驱动器选择的、并且执行感测操作的任意一条水平线之外的水平线的OLED元件由于所述扫描TFT和所述感测TFT被关断而保持发光状态。
10.根据权利要求9所述的OLED显示设备，其中，在紧挨着所述空白时间之前的所述有效时间期间被关断的子像素的OLED元件根据在所述OLED元件的关断时间期间保持在所述存储电容器中的驱动电压而在所述空白时间期间发光。
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