CN108257561A - 有机发光二极管显示装置及其驱动方法 - Google Patents
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Abstract
公开了一种有机发光二极管显示装置及其驱动方法。所述有机发光二极管OLED显示装置可包括像素和数据驱动器。所述像素包括:驱动薄膜晶体管TFT,其驱动OLED元件;第一开关TFT,其将数据线连接到所述驱动TFT的栅极;第二开关TFT,其将参考线连接到所述驱动TFT的源极;以及电容器,其连接在所述驱动TFT的栅极与源极之间。所述数据驱动器包括:第一放大器,其利用参考电压或数据电压驱动所述数据线;第二放大器,其利用初始化电压驱动所述参考线;以及第三放大器,其感测所述参考线的电压,并且将参考感测电压提供给所述第二放大器,其中,所述参考线的电压基于所述驱动TFT的阈值电压。
Description
技术领域
本发明涉及一种有机发光二极管显示装置及其驱动方法,该有机发光二极管显示装置能够简化用于实时补偿驱动晶体管的阈值电压的外部补偿电路的配置。
背景技术
用于使用数字数据来显示图像的代表性平板显示装置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显示装置以及使用电泳颗粒的电泳显示器(EPD)。
在这些显示装置中,OLED显示装置是通过电子与空穴的复合来使有机发光层发光的自发光装置,并且由于其高亮度、低驱动电压和超薄的膜厚度而被预期将成为下一代显示装置。
构成OLED显示装置的多个像素中的每一个包括OLED元件和用于驱动OLED元件的像素电路。像素电路包括用于将数据电压传送到存储电容器的开关薄膜晶体管(TFT)和用于根据在存储电容器中充入的电压来控制电流以将电流提供给OLED元件的驱动TFT。OLED元件产生与电流值成比例的光。
OLED显示装置根据工艺偏差、驱动环境、驱动时间和针对相同电压的驱动电流的差异而在每个像素的驱动TFT的阈值电压和驱动TFT的驱动特性方面是不一致的,使得可能会发生不均匀的亮度现象。为了解决这一问题,OLED显示装置附加地执行用于感测每个驱动TFT的驱动特性并对所感测到的结果进行补偿的外部补偿操作。
例如,OLED显示装置在制造过程和实时驱动过程中执行外部补偿操作以感测每个驱动TFT的驱动特性,以便基于感测信息来确定用于补偿驱动TFT的特性偏差的补偿值,并将该补偿值存储在存储器中。OLED显示装置使用存储在存储器中的补偿值来补偿要被提供到每个子像素的数据,并且使用所补偿的数据来驱动每个子像素,从而显示图像。
发明内容
为此,具有常规外部补偿功能的OLED显示装置需要用于在制造过程和实时驱动期间执行外部补偿操作的附加时间,并且另外需要感测电路、用于获取补偿值的操作电路和用于存储补偿值的存储器,从而造成时间损耗并增加了电路组件的成本。
因此,本发明针对一种OLED显示装置及其驱动方法,其基本上消除了由于现有技术的限制和缺点而引起的一个或更多个问题。
本发明的目的在于提供一种OLED显示装置及其驱动方法,该OLED显示装置能够简化用于实时补偿驱动TFT的阈值电压的外部补偿电路的配置。
本发明的另外的优点、目的和特征将在下面的描述中被部分地阐述,并且对于本领域普通技术人员而言在查阅下文之后部分地将变得明显或者可从本发明的实践而得知。通过在书面描述及其权利要求以及附图中具体指出的结构可实现并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,如在本文中所体现并广泛描述地,一种有机发光二极管(OLED)显示装置包括:像素,所述像素包括:驱动薄膜晶体管(TFT),所述驱动TFT被配置为驱动OLED元件;第一开关TFT,所述第一开关TFT被配置为通过第一选通线的控制将数据线连接到所述驱动TFT的栅极;第二开关TFT,所述第二开关TFT被配置为通过第二选通线的控制将参考线连接到所述驱动TFT的源极;以及电容器,所述电容器连接在所述驱动TFT DT的栅极与源极之间。所述OLED显示装置包括数据驱动器,所述数据驱动器包括:第一放大器,所述第一放大器被配置为驱动所述数据线;第二放大器,所述第二放大器被配置为驱动所述参考线;以及第三放大器,所述第三放大器被配置为感测反映所述驱动TFT的阈值电压的所述参考线的电压,并将参考感测电压提供给所述第二放大器。
用于驱动所述像素的每个帧可包括:扫描时段,在所述扫描时段期间,所述第一开关TFT和所述第二开关TFT导通,并且与所述数据电压对应的目标驱动电压被充电在所述电容器中;以及发光时段,在所述发光时段期间,所述第一开关TFT和所述第二开关TFT截止,并且所述驱动TFT通过在所述电容器中充电的所述目标驱动电压来驱动所述OLED元件。所述扫描时段可以包括初始化时段、感测时段和采样时段。
在本发明的另一方面中,一种驱动OLED显示装置的方法包括以下步骤:在初始化时段期间,向驱动TFT的栅极提供参考电压,并且在所述驱动TFT的源极中充电初始化电压;在感测时段期间,通过所述参考电压与所述初始化电压之间的差电压来驱动所述驱动TFT,并且将反映所述驱动TFT的阈值电压的参考电压充电在所述驱动TFT的源极中;以及在采样时段期间,向所述驱动TFT的栅极提供数据电压,通过所述驱动TFT的源极感测反映阈值电压的参考电压,并且将所感测的参考感测电压提供给所述驱动TFT的源极。
在所述初始化时段期间,第一放大器可经由数据线和第一开关TFT向所述驱动TFT的栅极提供所述参考电压,并且第二放大器可经由参考线和第二开关TFT向所述驱动TFT的源极提供所述初始化电压。
在所述感测时段期间,所述第一放大器可经由所述数据线和所述第一开关TFT向所述驱动TFT的栅极提供所述参考电压,所述第二放大器可以变为高阻抗状态,并且减去阈值电压的参考电压可通过所述驱动TFT的驱动而被充电在所述驱动TFT的源极和所述参考线中。
在所述采样时段期间,所述第一放大器可经由所述数据线和所述第一开关TFT向所述驱动TFT的栅极提供所述数据电压,所述第三放大器可感测所述参考线的减去阈值电压的参考电压以作为所述参考感测电压,并且将所述参考感测电压提供给所述第二放大器,所述第二放大器可经由所述参考线和所述第二开关TFT向所述驱动TFT的源极提供从所述第三放大器提供的所述参考感测电压,并且所述电容器可存储所述数据电压与所述参考感测电压之间的差电压以作为目标驱动电压。
本发明的前面的简要描述和下面的详细描述两者均是说明性的,并且旨在提供对要保护的本发明的进一步说明。
附图说明
附图被包括以提供对本发明的进一步理解,并且被并入本申请中并构成本申请的一部分,附图例示了本发明的实施方式,并且与本说明书一起用来解释本发明的原理。
图1是例示表示根据本发明的实施方式的OLED显示装置的一个像素电路和与该像素电路连接的数据驱动器的部分配置的电路图。
图2是例示表示根据本发明的另一实施方式的OLED显示装置的一个像素电路和与该像素电路连接的数据驱动器的部分配置的电路图。
图3是例示根据本发明的实施方式的第一放大器至第三放大器的输出电压的波形图。
图4是例示根据本发明的实施方式的像素和数据驱动器的初始化时段的操作的示图。
图5是例示根据本发明的实施方式的像素和数据驱动器的感测时段的操作的示图。
图6是例示根据本发明的实施方式的像素和数据驱动器的采样时段的操作的示图。
图7是示意性地例示根据本发明的实施方式的OLED显示装置的配置的框图。
具体实施方式
现在将详细参照本发明的实施方式,在附图中例示了本发明的实施方式的示例。在任何可能的情况下,遍及整个附图将使用相同的附图标记来指代相同或相似的部件。
图1是例示根据本发明的实施方式的OLED显示装置的部分配置的电路图,图2是例示根据本发明的另一实施方式的OLED显示装置的部分配置的电路图,并且图3是根据本发明的实施方式的数据驱动器的波形图。
参照图1和图2,像素Pmn代表性地示出了在显示面板中以矩阵形式配置的多个像素当中的第m像素列(其中,m是自然数)和第n像素行(其中,n是自然数)的第(m,n)像素结构。
在图1和图2中,数据驱动器10包括:在用于单独驱动显示面板的数据线的放大器当中的用于驱动第m数据线Dm的第一放大器A1m;在用于单独驱动显示面板的参考线的放大器当中的用于驱动第m参考线Rm的第二放大器A2m;以及在用于单独感测参考线的放大器当中的用于感测第m参考线的第三放大器A3m。
像素Pmn包括:OLED元件;驱动薄膜晶体管(TFT)DT,其用于驱动OLED元件;第一开关TFT ST1,其用于将数据线Dm连接到驱动TFT DT的栅极;第二开关TFT ST2,其用于将参考线Rm连接到驱动TFT DT的源极;以及电容器C,其连接在驱动TFT DT的栅极与源极之间。
可使用非晶硅(a-Si)TFT、多晶硅(poly-Si)TFT、氧化物TFT或有机TFT作为开关TFT ST1和ST2以及驱动TFT DT。
驱动TFT DT连接在第一电源(以下,称为EVDD)线与OLED元件的阳极之间,以根据存储在电容器C中的驱动电压Vgs将从EVDD线提供的电流作为驱动电流提供给OLED元件。
OLED元件包括与驱动TFT DT的源极连接的阳极、与第二电源(以下,称为EVSS)线连接的阴极以及连接在阳极与阴极之间的有机发光层。虽然阳极针对每个像素被独立地形成,但是阴极可以被像素共享。如果向OLED元件提供驱动电流,则电子和空穴分别从阴极和阳极被注入到OLED元件的有机发光层中,并且在有机发光层中复合以发出与驱动电流的电流值成比例的荧光或磷光材料的光。
参照图1,第一开关TFT ST1可由第n像素行的第一选通线G1n控制,而第二开关TFTST2可由第n像素行的第二选通线G2n控制。
另选地,如图2所示,第一开关TFT ST1和第二开关TFT ST2可由第n像素行的一条选通线Gn控制。
第一开关TFT ST1在第n像素行的扫描时段期间被导通,从而将数据线Dm连接到驱动TFT DT的栅极。第二开关TFT ST2在第n像素行的扫描时段期间被导通,从而将参考线Rm连接到驱动TFT DT的源极。如图3所示,每个扫描时段包括初始化时段M1、感测时段M2和采样时段M3。第一开关TFT ST1和第二开关TFT ST2在发光时段期间截止。
在初始化时段M1和感测时段M2期间,第一开关TFT ST1将提供给数据线Dm的参考电压Vref提供给驱动TFT的栅极。在采样时段M3期间,第一开关TFT ST1将提供给数据线Dm的数据电压Vdata提供给驱动TFT DT的栅极。
在初始化时段M1期间,第二开关TFT ST2将提供给参考线Rm的初始化电压Vi提供给驱动TFT DT的源极。在感测时段M2期间,第二开关TFT ST2将驱动TFT DT的源极中的反映驱动TFT DT的阈值电压(Vth)的参考电压Vref-Vth提供给参考线Rm。在采样时段期间,第二开关TFT ST2将提供给参考线Rm的补偿了Vth的参考电压Vref-Vth(即,参考电压与阈值电压之间的差电压Vref-Vth)提供给驱动TFT DT的源极。
连接在驱动TFT DT的栅极与源极之间的电容器C存储驱动TFT DT的驱动电压Vgs。电容器C在像素Pmn的感测时段M2期间感测并存储驱动TFT DT的Vth,在采样时段M3期间将数据电压Vdata与反映Vth的电压Vref-Vth之间的差电压Vdata-Vref+Vth存储为驱动电压Vgs,并且在发光时段期间保持驱动电压Vgs以使驱动TFT DT提供恒定的目标电流。
数据驱动器10包括用于驱动数据线Dm的第一放大器A1m。第一放大器A1m的非反相输入端(+)连接到交替地提供参考电压Vref和数据电压Vdata的输入线,而第一放大器A1m的反相输入端(-)连接到输出端作为反馈结构,以用作输出缓冲器。第一放大器A1m对在每个水平时段期间被依次提供给非反相输入端(+)的参考电压Vref和数据电压Vdata进行缓冲,并且将缓冲后的参考电压Vref和数据电压Vdata依次提供给数据线Dm。数据驱动器10将数字像素数据转换为模拟数据电压Vdata。数据驱动器10在每个水平时段的初始化时段M1和感测时段M2期间将参考电压Vref提供给第一放大器A1m的输入端,并且第一放大器A1m对参考电压Vref进行缓冲,并且将缓冲后的参考电压Vref提供给数据线Dm。数据驱动器10在每个水平时段的感测时段M2的接下来的采样时段M3期间将数据电压Vdata提供给第一放大器A1m的输入端,并且第一放大器A1m对数据电压Vdata进行缓冲,并将缓冲后的数据电压Vdata提供给数据线Dm。
数据驱动器10包括具有用于驱动参考线Rm的第二放大器A2m和用于感测参考线Rm的电压的第三放大器A3m的外部模拟补偿器,该第二放大器A2m和第三放大器A3m被配置为反馈结构。第三放大器A3m感测参考线Rm的电压,并且将所感测到的电压提供给第二放大器A2m,然后第二放大器A2m通过所感测到的参考线Rm的电压来驱动参考线Rm。
第二放大器A2m的非反相输入端(+)连接到提供有初始化电压Vi的输入线,并且连接到第三放大器A3m的输出端,而第二放大器A2m的反相端(-)连接到第二放大器A2m的输出端以作为反馈结构。第三放大器A3m的非反相输入端(+)连接到参考线Rm,而第三放大器A3m的反相输入端(-)连接到第三放大器A3m的输出端以作为反馈结构。第三放大器A3m的输出端连接到第二放大器A2m的非反相输入端(+)。
第二放大器A2m在每个水平时段的初始化时段M1期间将初始化电压Vi提供给参考线Rm,在感测时段M2期间进入高阻抗Hi-Z状态,并且在采样时段M3期间将通过第三放大器A3m感测到的参考线Rm的电压Vref-Vth提供给参考线Rm。第三放大器A3m在每个水平时段的初始化时段期间进入高阻抗Hi-Z状态,并且在感测时段M2期间进入高阻抗Hi-Z状态或正常驱动状态。在采样时段M3期间,第三放大器A3m感测参考线Rm的电压Vref-Vth,并且将所感测到的电压Vref-Vth提供给第二放大器A2m的输入端。
图4至图6是依次例示根据本发明的实施方式的任一像素的扫描时段期间的操作过程的示图。现在也将参照图3所示的数据驱动器的波形来描述该操作过程。
参照图3和图4,在每个扫描时段的初始化时段M1期间,第一放大器A1m向数据线Dm提供参考电压Vref,并且第二放大器A2m向参考线Rm提供初始化电压Vi。在这种情况下,第三放大器A3m进入高阻抗Hi-Z状态,因此不执行缓冲操作。第一开关TFT ST1将提供给数据线Dm的参考电压Vref传送到驱动TFT DT的栅极,以将驱动TFT DT的栅极初始化为参考电压Vref,而第二开关TFT ST2将提供给参考线Rm的初始化电压Vi传送到驱动TFT DT的源极,以将驱动TFT DT的源极初始化为初始化电压Vi。例如,在初始化时段M1期间,将驱动TFT DT的Vg设定为Vref,并且将驱动TFT DT的Vs设定为Vi,同时使第三放大器A3m截止并且将第二放大器A2m开启以提供Vi。
然后,电容器C充电有分别提供到驱动TFT DT的栅极和源极的参考电压Vref和初始化电压Vi之间的差电压Vref-Vi(例如,Vref在电容器的顶板上,而Vi在电容器的底板上)。在初始化时段M1期间,参考电压Vref和初始化电压Vi被设置为使得充入在电容器C中的差电压Vref-Vi大于驱动TFT DT的Vth。也就是说,参考线Rm的初始化电压Vi被设置为小于“Vref-Vth”,并且小于OLED元件的阈值电压(Vth')。阈值电压Vth和Vth'是在面板设计期间确定的值,因此是可预料的。由于充入在电容器C中的差电压Vref-Vi大于驱动TFT DT的Vth,所以驱动TFT DT被驱动。然而,由于初始化电压Vi小于OLED元件的Vth',所以OLED元件不发光。例如,电压被设置为使得OLED的Vth'大于充入在电容器C中的差电压Vref-Vi,该差电压Vref-Vi大于驱动TFT DT的Vth(例如,OLED Vth'>Vref-Vi>驱动TFT Vth)。
参照图3和图5,在感测时段M2期间,第一放大器A1m继续通过数据线Dm和第一开关TFT ST1提供参考电压Vref,而第二放大器A2m进入高阻抗Hi-Z状态,并且不向参考线Rm输出初始化电压Vi。在这种情况下,第三放大器A3m可在高阻抗Hi-Z状态或正常状态下操作,以用作缓冲器(例如,具有单位增益的电压跟随器)。在正常状态下操作的第三放大器A3m可以对在参考线Rm中充入的电压进行缓冲,并将缓冲后的电压提供给处于高阻抗Hi-Z状态的第二放大器A2m的输入端。
在该感测时段M2期间,驱动TFT DT通过充入在电容器C中的电压Vref-Vi来驱动,直到驱动TFT DT进入饱和状态为止,例如,直到电容器C的两端之间的电压差变为Vth为止。例如,在感测时段M2期间,驱动TFT DT保持导通,并且除了电容器C的底板之外电流无处流动,因此电容器的底板上的电压从Vi变为Vref-Vth。然后,由于驱动TFT的Vs被设置为电容器C的底板处的电压,所以驱动TFT DT的源极的电压(Vs)从初始化电压Vi被升高到反映了Vth的电压Vref-Vth,例如,减去Vth的参考电压Vref-Vth,并且按照与驱动TFT的源极相同的方式,通过第二开关TFT ST2将减去Vth的参考电压Vref-Vth充入到参考线Rm中。在该感测时段M2期间,如图3中的电压波形所示,第二放大器A2m的输出端的电压处于高阻抗Hi-Z状态,并且第三放大器A3m的输出端的电压按照与参考线Rm相同的方式从初始化电压Vi被逐渐升高到反映Vth的参考电压Vref-Vth。例如,在感测时段M2期间,驱动TFT DT的Vg被设置为Vref,驱动TFT DT的Vs被设置为Vref-Vth,并且驱动TFT DT的Vgs被设置为Vref-(Vref-Vth),并且驱动TFT DT的Vgs变成被设置为Vth。结果,第三放大器A3m可以感测到充入在参考线Rm中的反映Vth的电压Vref-Vth。在感测时段M2期间,由于充入在驱动TFT DT的源极中的电压Vref-Vth小于OLED元件的Vth',所以OLED元件不发光。
参照图3和图6,在采样时段M3期间,第一放大器A1m将数据电压Vdata传送到数据线Dm,第三放大器A3m感测在参考线Rm中充入的电压Vref-Vth,并且将所感测到的电压提供给第二放大器A2m的输入端,并且第二放大器A2m对从第三放大器A3m提供的参考感测电压Vref-Vth(例如,减去Vth的参考电压Vref-Vth)进行缓冲,并将缓冲后的电压(例如,Vref-Vth)提供给参考线Rm。
然后,第一开关TFT ST1将提供给数据线Dm的数据电压Vdata提供给驱动TFT DT的栅极,而第二开关TFT ST2将提供给参考线Rm的参考感测电压Vref-Vth提供给驱动TFT DT的源极。因此,电容器C存储数据电压Vdata与参考感测电压Vref-Vth之间的差电压Vdata-Vref+Vth,例如,补偿了Vth的驱动电压Vgs=(Vdata-Vref+Vth)。例如,在采样时段M3期间,驱动TFT DT的Vgs被设置为(Vdata-(Vref-Vth))。通过存储在电容器C中的驱动电压Vgs=(Vdata-Vref+Vth),驱动TFT DT可以产生由数据电压Vdata与参考电压Vref之间的差电压Vdata-Vref确定的恒定的目标电流I_oled,而不管Vth如何,如式1所示,并将目标电流I_oled提供给OLED元件。
式1:
I_oled=K(Vgs-Vth)2=K(Vdata-Vref+Vth-Vth)2=K(Vdata-Vref)2
在采样时段M3之后,在第一开关TFT ST1和第二开关TFT ST2截止的发光时段期间,驱动TFT DT通过在电容器C中保持的驱动电压Vgs向OLED元件提供恒定的目标电流I_oled,从而使OLED元件发光。
以这种方式,根据实施方式的OLED装置可以提供一致的目标电流,而不管驱动TFTDT的特性偏差如何,因此可防止像素之间由驱动TFT DT的特性偏差引起的不均匀的亮度现象。
图7是示意性地例示根据本发明的实施方式的OLED显示装置的配置的框图。
参照图7,OLED显示装置包括定时控制器40、数据驱动器10、选通驱动器20和显示面板30。
显示面板30通过具有以矩阵形式排列的像素的像素阵列来显示图像。像素阵列的基本像素可通过至少三个子像素W/R/G、B/W/R、G/B/W、R/G/B或W/R/G/B来配置,这些子像素可通过白色(W)子像素、红色(R)子像素、绿色(G)子像素和蓝色(B)子像素的颜色混合来表现白色。如图1和图2所示的实施方式,每个像素P包括OLED元件和像素电路,所述像素电路包括用于独立驱动OLED元件的驱动TFT DT、第一开关TFT ST1和第二开关TFT ST2以及电容器C。
定时控制器40对输入图像数据执行诸如补偿图片质量或降低耗散功率的图像处理,并将图像处理后的数据输出到数据驱动器10。定时控制器40使用输入时序控制信号来产生用于控制数据驱动器10的驱动时序的数据控制信号和用于控制选通驱动器20的驱动时序的选通控制信号,并且将数据控制信号和选通控制信号分别输出到数据驱动器10和选通驱动器20。
选通驱动器20使用从定时控制器40提供的选通控制信号来驱动显示面板30的多条选通线。选通驱动器20响应于选通控制信号,将扫描时段期间的选通导通电压和其它时段期间的选通截止电压的扫描脉冲提供给每条选通线。
数据驱动器10从定时控制器40接收数据控制信号和图像数据,并且从电源接收参考电压Vref和初始化电压Vi。数据驱动器10由数据控制信号驱动,将从伽马电压发生器提供的参考伽马电压集划分为与数据的灰度级值对应的灰度级电压,然后使用所划分的灰度级电压将数字图像数据转换为模拟数据电压Vdata。
如上所述,数据驱动器10在每一个水平扫描时段期间使用第一放大器A1m依次向每条数据线Dm提供参考电压Vref和数据电压Vdata。包括在数据驱动器10中的外部模拟补偿器在每个扫描时段期间使用第二放大器A2m向每条参考线Rm提供初始化电压Vi,使用第三放大器A3m通过每条参考线Rm来感测对应像素Pmn的驱动TFT DT的反映Vth的参考电压Vref-Vth,然后使用第二放大器A2m通过每条参考线Rm向像素Pmn提供所感测到的参考电压Vref-Vth。
因此,每个像素Pmn的驱动TFT DT可产生由数据电压Vdata与参考电压Vref之间的差电压Vdata-Vref确定的恒定的目标电流I_oled,而不管Vth如何,并且将目标电流I_oled提供给OLED元件。
以这种方式,由于根据实施方式的OLED显示装置可向OLED元件提供恒定的目标电流而不管驱动TFT DT的特性偏差如何,所以可防止像素之间由驱动TFT DT的特性偏差引起的不均匀亮度现象。
在根据实施方式的OLED显示装置及其驱动方法中,可使用用于驱动参考线的放大器和用于感测参考线的放大器被配置为反馈结构的外部模拟补偿器来从每个像素感测驱动TFT的反映Vth的参考电压,并且在采样时段期间将所感测到的参考电压再次提供给每个像素。然后,由于每个像素可使用驱动TFT的补偿了Vth的目标驱动电压Vgs通过均匀一致的驱动电流来驱动OLED元件,所以可防止由驱动TFT的Vth偏差引起的亮度不均匀现象,并且可实现均匀的亮度。
结果,根据实施方式的OLED显示装置及其驱动方法可通过在制造过程期间省略外部补偿操作来降低制造成本,通过甚至在实时驱动期间省略外部补偿操作来防止时间损耗,并且因为诸如用于获得补偿值的感测电路和操作电路的外部补偿电路和用于存储补偿值的存储器是不必要的,所以减少了电路组件的数目并且减少了电路占用的面积以及显著地降低了电路成本。
对于本领域技术人员显而易见的是,在不脱离本发明的精神或范围的情况下,可在本发明中进行各种修改和变型。因此,本发明旨在覆盖本发明的在所附权利要求及其等同物的范围内的修改和变型。
相关申请的交叉引用
本申请要求于2016年12月29日在韩国提交的韩国专利申请No.10-2016-0182306的权益,该韩国专利申请的全部内容通过引用并入本文。
Claims (15)
1.一种有机发光二极管OLED显示装置,该OLED显示装置包括:
像素,所述像素包括:
驱动薄膜晶体管TFT,所述驱动TFT被配置为驱动OLED元件;
第一开关TFT,所述第一开关TFT被配置为通过第一选通线的控制将数据线连接到所述驱动TFT的栅极;
第二开关TFT,所述第二开关TFT被配置为通过第二选通线的控制将参考线连接到所述驱动TFT的源极;以及
电容器,所述电容器连接在所述驱动TFT的所述栅极与所述驱动TFT的所述源极之间;以及
数据驱动器,所述数据驱动器包括:
第一放大器,所述第一放大器被配置为利用参考电压Vref或数据电压Vdata来驱动所述数据线;
第二放大器,所述第二放大器被配置为利用初始化电压来驱动所述参考线;以及
第三放大器,所述第三放大器被配置为感测所述参考线的电压,并且将参考感测电压提供给所述第二放大器,其中,所述参考线的电压是基于所述驱动TFT的阈值电压Vth的。
2.根据权利要求1所述的OLED显示装置,其中,所述参考感测电压被设置为所述参考电压Vref减去所述驱动TFT的所述阈值电压Vth。
3.根据权利要求1所述的OLED显示装置,其中,所述第二放大器的输出端连接到所述参考线,所述第二放大器的非反相输入端连接到所述第三放大器的输出端,并且所述第二放大器的反相输入端以电压跟随方式连接到所述第二放大器的输出端,并且
其中,所述第三放大器的非反相输入端连接到所述参考线,并且所述第三放大器的反相输入端以电压跟随方式连接到所述第三放大器的输出端。
4.根据权利要求1所述的OLED显示装置,其中,所述数据驱动器被配置为在多个帧内驱动所述像素,
其中,所述多个帧中的每个帧包括:
扫描时段,在所述扫描时段期间,所述第一开关TFT和所述第二开关TFT导通,并且与所述数据电压Vdata对应的目标驱动电压被充电在所述电容器中;以及
发光时段,在所述发光时段期间,所述第一开关TFT和所述第二开关TFT截止,并且所述驱动TFT利用在所述电容器中充电的所述目标驱动电压来驱动所述OLED元件,
其中,所述扫描时段包括初始化时段、感测时段和采样时段,
其中,在所述初始化时段期间,所述第一放大器经由所述数据线和所述第一开关TFT向所述驱动TFT的所述栅极提供所述参考电压Vref,并且所述第二放大器经由所述参考线和所述第二开关TFT向所述驱动TFT的所述源极提供所述初始化电压,
其中,在所述感测时段期间,所述第一放大器经由所述数据线和所述第一开关TFT向所述驱动TFT的所述栅极提供所述参考电压Vref,所述第二放大器进入高阻抗状态,并且减去阈值电压的参考电压(Vref-Vth)通过所述驱动TFT的驱动被充电在所述驱动TFT的所述源极和所述参考线中,并且
其中,在所述采样时段期间,所述第一放大器经由所述数据线和所述第一开关TFT向所述驱动TFT的所述栅极提供所述数据电压Vdata,所述第三放大器感测所述减去阈值电压的参考电压(Vref-Vth)以作为所述参考感测电压,并且将所述参考感测电压提供给所述第二放大器,所述第二放大器经由所述参考线和所述第二开关TFT向所述驱动TFT的所述源极提供从所述第三放大器提供的所述参考感测电压,并且所述电容器存储所述数据电压Vdata与所述参考感测电压(Vref-Vth)之间的差电压(Vdata-(Vref-Vth))以作为所述目标驱动电压。
5.根据权利要求4所述的OLED显示装置,其中,所述初始化电压小于所述参考电压Vref减去所述驱动TFT的所述阈值电压Vth,以在所述初始化时段期间通过在所述电容器中存储的所述参考电压Vref减去所述初始化电压的电压来驱动所述驱动TFT,并且
其中,所述初始化电压小于所述OLED元件的阈值电压,以使所述OLED元件在所述初始化时段和所述感测时段期间不发光。
6.根据权利要求4所述的OLED显示装置,其中,在所述初始化时段期间,所述第三放大器进入高阻抗状态,并且
其中,在所述感测时段期间,所述第三放大器进入所述高阻抗状态或执行正常缓冲操作。
7.根据权利要求1所述的OLED显示装置,其中,所述OLED元件的阈值电压大于所述参考电压Vref减去所述初始化电压,并且所述参考电压Vref减去所述初始化电压大于所述驱动TFT的所述阈值电压Vth。
8.根据权利要求1所述的OLED显示装置,其中,所述第一选通线和所述第二选通线是不同的选通线或相同的选通线。
9.根据权利要求4所述的OLED显示装置,其中,在所述感测时段期间,在所述驱动TFT的所述栅极保持所述参考电压Vref的同时,所述驱动TFT的所述源极从所述初始化电压逐渐被充电至所述参考电压Vref减去所述驱动TFT的所述阈值电压Vth。
10.一种驱动有机发光二极管OLED显示装置的方法,该方法包括以下步骤:
在初始化时段期间,向连接到OLED元件的驱动薄膜晶体管TFT的栅极提供参考电压Vref,并且在所述驱动TFT的源极中充电初始化电压;
在感测时段期间,向所述驱动TFT的所述栅极提供所述参考电压Vref,并且基于所述参考电压Vref减去所述驱动TFT的阈值电压Vth,将所述驱动TFT的所述源极从所述初始化电压充电至参考感测电压;以及
在采样时段期间,向所述驱动TFT的所述栅极提供数据电压Vdata,感测所述参考感测电压并且将所述参考感测电压提供给所述驱动TFT的所述源极。
11.一种驱动根据权利要求1至9中的任一项所述的有机发光二极管OLED显示装置的方法。
12.一种有机发光二极管OLED显示装置,该OLED显示装置包括:
像素电路,所述像素电路包括:
驱动薄膜晶体管TFT,所述驱动TFT连接到OLED元件;
第一开关TFT,所述第一开关TFT被配置为将数据线连接到所述驱动TFT的栅极;
第二开关TFT,所述第二开关TFT被配置为将参考线连接到所述驱动TFT的源极;以及
电容器,所述电容器连接在所述驱动TFT的所述栅极与所述驱动TFT的所述源极之间;以及
数据驱动器,所述数据驱动器包括用于补偿所述驱动TFT的阈值电压Vth的模拟补偿电路,
其中,所述模拟补偿电路包括第二放大器和第三放大器,
其中,所述第二放大器连接到所述第三放大器的输出端,并且
其中,所述第三放大器被配置为感测所述参考线的电压并且将参考感测电压提供给所述第二放大器,并且所述第二放大器被配置为将基于所述参考感测电压的补偿电压提供给所述参考线。
13.根据权利要求12所述的OLED显示装置,其中,所述第二放大器的输出端连接到所述参考线,所述第二放大器的非反相输入端连接到所述第三放大器的输出端,并且所述第二放大器的反相输入端以电压跟随方式连接到所述第二放大器的输出端,并且
其中,所述第三放大器的非反相输入端连接到所述参考线,并且所述第三放大器的反相输入端以电压跟随方式连接到所述第三放大器的输出端。
14.根据权利要求12所述的OLED显示装置,其中,所述参考感测电压被设置为向所述驱动TFT的所述栅极提供的参考电压Vref减去所述驱动TFT的所述阈值电压Vth。
15.根据权利要求12所述的OLED显示装置,该OLED显示装置还包括第一放大器,所述第一放大器被配置为利用参考电压Vref或数据电压Vdata来驱动所述数据线。
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US20200013340A1 (en) | 2020-01-09 |
CN108257561B (zh) | 2020-08-04 |
KR102642578B1 (ko) | 2024-02-29 |
KR20180077699A (ko) | 2018-07-09 |
US20180190198A1 (en) | 2018-07-05 |
US10460666B2 (en) | 2019-10-29 |
US10699644B2 (en) | 2020-06-30 |
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