CN115273755A - 显示设备 - Google Patents
显示设备 Download PDFInfo
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- CN115273755A CN115273755A CN202210939999.0A CN202210939999A CN115273755A CN 115273755 A CN115273755 A CN 115273755A CN 202210939999 A CN202210939999 A CN 202210939999A CN 115273755 A CN115273755 A CN 115273755A
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- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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Abstract
公开了一种显示设备,包括用于显示图像的多个像素,其中所述多个像素根据初始化时段、编程时段、采样时段和发光时段通过多个信号被驱动,其中所述多个信号包括:第一扫描信号,所述第一扫描信号在所述初始化时段和所述采样时段中具有高电平,在所述编程时段和所述发光时段中具有低电平;第二扫描信号,所述第二扫描信号在所述编程时段和所述采样时段中具有高电平,在所述初始化时段和所述发光时段中具有低电平;以及第一电极的电压,所述第一电极的电压与在所述初始化时段中的所述第一扫描信号的下降时间同步地降低。
Description
本申请是申请号为201911174567.X、申请日为2019年11月26日、发明名称为“显示设备”的发明专利申请的分案申请。
技术领域
本发明涉及一种显示设备。
背景技术
除电视机或监视器的显示设备之外,显示设备还广泛用作笔记本电脑、平板电脑、智能电话、便携式显示装置和便携式信息装置等的显示屏。
这种显示设备的具体示例包括液晶显示设备(LCD)、有机发光显示设备(OLED)、量子点显示设备等。
使用自发光器件显示图像的有机发光显示设备具有高响应速度、低功耗,而且没有视角问题,因此,有机发光显示设备作为下一代显示设备受到关注。
由于工艺变化等引起的驱动晶体管的阈值电压等的变化,有机发光显示设备的每个像素的发光器件中流动的电流可能会发生变化。在一般的有机发光显示设备中,由于因驱动晶体管的电特性的变化和像素之间发生的发光器件的劣化变化而导致的像素之间的亮度变化,可发生亮度不均匀。具体地,像素之间发生的发光器件的劣化偏差可由每个像素根据有机发光显示设备的驱动时间而具有不同的劣化速度引起,并且可引起亮度不均匀现象、亮度劣化现象和残像现象。
有机发光显示设备的发光器件可自阳极电极的电压大于发光器件的阈值电压的时刻起发光。此外,在相关技术的有机发光显示设备中,即使当数据电压具有可在驱动电路***中实现的最小值时,发光器件的阳极电极的电压也可大于发光器件的阈值电压,这引起发光器件会稍微发光并且不能实现深黑色的问题。此外,当减小驱动晶体管的栅极-源极电压以实现显示设备的深黑色时,数据电压裕度(margin)减小。
发明内容
因此,本发明旨在提供一种基本上克服了由于相关技术的局限性和缺点而导致的一个或多个问题的显示设备。
本发明的一个方面旨在提供一种显示设备,其通过当数据电压具有预定的最小值时使发光器件的阳极电极的电压降低到发光器件的阈值电压或更低,在确保数据电压裕度的同时实现深黑色。
本发明的另一个方面旨在提供一种显示设备,其能够通过与扫描信号的下降时间同步地降低发光器件的阳极电极的电压来防止当数据电压具有预定的最小值时发光器件的发光。
本发明的其他优点和特征将在下面的描述中得到部分阐述,并且部分在研究下文后对所属领域普通技术人员来说将变得显而易见或可从本发明的实践中获知。本发明的目的和其他优点可通过说明书及其权利要求书以及附图中具体指出的结构来实现和获得。
为了实现这些和其他优点并根据本发明的意图,如在此具体化和概括描述的,提供了一种显示设备,所述显示设备包括:像素,所述像素包括具有驱动晶体管的像素电路和连接到所述像素电路的发光器件,其中所述像素电路包括:驱动晶体管,所述驱动晶体管控制驱动电流在所述发光器件的流动;数据提供晶体管,所述数据提供晶体管将数据电压选择性地提供给作为所述驱动晶体管的源极电极的第一节点;第一发光控制晶体管,所述第一发光控制晶体管将所述第一节点选择性地连接到作为所述发光器件的阳极电极的第二节点;第一初始化晶体管,所述第一初始化晶体管将初始化电压选择性地提供给所述第二节点;第二发光控制晶体管,所述第二发光控制晶体管将驱动电压选择性地提供给作为所述驱动晶体管的漏极电极的第三节点;第二初始化晶体管,所述第二初始化晶体管将所述第三节点选择性地连接到作为所述驱动晶体管的栅极电极的第四节点;第一电容器,所述第一电容器连接在所述第二节点和所述第四节点之间;以及第二电容器,所述第二电容器连接在所述第二节点与所述数据提供晶体管的栅极电极之间。
在一个方面,一种显示设备包括:用于显示图像的多个像素,其中所述多个像素根据初始化时段、编程时段、采样时段和发光时段通过多个信号被驱动,其中所述多个信号包括:第一扫描信号,所述第一扫描信号在所述初始化时段和所述采样时段中具有高电平,在所述编程时段和所述发光时段中具有低电平;第二扫描信号,所述第二扫描信号在所述编程时段和所述采样时段中具有高电平,在所述初始化时段和所述发光时段中具有低电平;以及第一电极的电压,所述第一电极的电压与在所述初始化时段中的所述第一扫描信号的下降时间同步地降低。
在另一个方面,一种显示设备包括:用于显示图像的多个像素,其中所述多个像素根据初始化时段、编程时段、采样时段和发光时段通过多个信号被驱动,其中所述多个信号包括:第一扫描信号,所述第一扫描信号在所述初始化时段和所述采样时段中具有高电平,在所述编程时段和所述发光时段中具有低电平;第二扫描信号,所述第二扫描信号在所述编程时段和所述采样时段中具有高电平,在所述初始化时段和所述发光时段中具有低电平;以及第一电极的电压,所述第一电极的电压与在所述采样时段中的所述第一扫描信号的下降时间同步地降低。
在又一个方面,一种显示设备包括:一种显示设备,包括:用于显示图像的多个像素,其中所述多个像素根据初始化时段、编程时段、采样时段和发光时段通过多个信号被驱动,其中所述多个信号包括:第一扫描信号,所述第一扫描信号在所述初始化时段和所述采样时段中具有高电平,在所述编程时段和所述发光时段中具有低电平;第二扫描信号,所述第二扫描信号在所述编程时段和所述采样时段中具有高电平,在所述初始化时段和所述发光时段中具有低电平;以及第一电极的电压,所述第一电极的电压在所述采样时段之后与所述第二扫描信号的下降时间同步地降低。
应当理解,本发明前面的概括描述和下面的详细描述都是示例性的和解释性的,旨在对要求保护的本发明提供进一步的解释。
附图说明
给本发明提供进一步理解且并入本申请组成本申请一部分的附图图解了本发明的实施方式,并与说明书一起用于解释本发明的原理。在附图中:
图1是示出根据本发明的示例的显示设备的示图。
图2是示出图1中所示的显示设备中的像素的电路图。
图3是示出图2中所示的显示设备的像素中的像素电路和发光器件的驱动的波形图。
图4A至4D是示出在图2中所示的显示设备的像素中,像素电路和发光器件根据初始化时段、编程时段、采样时段和发光时段的驱动的示图。
图5是示出在图2中所示的显示设备的像素中,发光器件根据数据电压的亮度的曲线图。
具体实施方式
现在将详细参考本发明的示例性实施方式进行描述,附图中图解了这些实施方式的一些示例。尽可能地将在整个附图中使用相同的参考标记表示相同或相似的部分。
将通过参照附图描述的以下实施方式阐明本发明的优点和特征以及其实现方法。然而,本发明可以以不同的形式实施,不应解释为限于在此阐述的实施方式。而是,提供这些实施方式是为了使本公开内容透彻和完整,并且将本发明的范围充分地传递给所属领域技术人员。此外,本发明仅由权利要求书的范围限定。
为了描述本发明的实施方式而在附图中公开的形状、大小、比例、角度和数量仅仅是示例,因而本发明不限于示出的细节。相似的参考标记通篇指代相似的要素。在下面的描述中,当确定对相关已知技术的详细描述会不必要地使本发明的重点模糊不清时,将省略该详细描述。在本申请中使用“包括”、“具有”和“包含”进行描述的情况下,可添加其他部分,除非使用了“仅”。
在解释一要素时,尽管没有明确说明,但该要素解释为包含误差范围。
在描述位置关系时,例如,当两部分之间的位置关系被描述为“在……上”、“在……上方”、“在……下方”和“在……之后”时,可在这两部分之间设置一个或多个其他部分,除非使用了“正好”或“直接”。
在描述时间关系时,例如,当时间顺序被描述为“在……之后”、“随后”、“接下来”和“在……之前”时,可包括不连续的情况,除非使用了“正好”或“直接”。
将理解到,尽管在此可使用术语“第一”、“第二”等来描述各种要素,但这些要素不应受这些术语限制。这些术语仅仅是用来将一要素与另一要素区分开。例如,在不背离本发明的范围的情况下,第一要素可被称为第二要素,类似地,第二要素可被称为第一要素。
在描述本发明的要素时,可使用术语“第一”、“第二”等。这些术语仅用于将一个要素与其它要素区分开,并且相应要素的本质、顺序、次序或数量不受这些术语的限制。将理解的是,当一个元件或层被描述为“连接”、“耦接”或“附着”到另一个元件或层时,所述一个元件或层可直接连接或附着到所述另一个元件或层,其他元件或层可“设置”在多个元件或层之间,或者多个元件或层可通过其他元件或层而彼此“连接”、“耦接”或“附着”。
所属领域技术人员能够充分理解到,本发明各实施方式的特征可彼此部分或整体地结合或组合,并且可在技术上彼此进行各种互操作和驱动。本发明的实施方式可彼此独立实施,或者可以以相互依赖的关系共同实施。
下文中,将参照附图详细描述根据本发明的显示设备的实施方式。在给每个附图中的元件添加参考标记时,尽管在不同的附图示出,但是相似的参考标记可表示相似的元件。
图1是示出根据本发明的示例的显示设备的平面图。
参照图1,显示设备包括显示面板100、时序控制器300、数据驱动电路500和扫描驱动电路700。
显示面板100可包括多条数据线DL、多条扫描线SL、多条电压供给线VL和多个像素P。
多条数据线DL中的每一条可在第一方向上延伸,并且可在与第一方向交叉的第二方向上彼此间隔开。多条扫描线SL中的每一条可沿第二方向延伸,并且可沿第一方向彼此间隔开。多条电压供给线VL中的每一条可沿第一方向延伸并且可沿第二方向彼此间隔开。多条数据线DL、多条扫描线SL和多条电压供给线VL的方向不限于此,并且其中布置有相应各线的第一方向和第二方向可互相替换或可变化。
多个像素P中的每一个可设置在每个像素区域处,每个像素区域由设置在显示面板100的显示区域中的相应扫描线SL、相应数据线DL和相应电压供给线VL限定。
根据示例,多个像素P可包括红色子像素、绿色子像素和蓝色子像素。例如,沿扫描线SL(或数据线DL)的长度方向布置的红色子像素、绿色子像素和蓝色子像素可构成显示图像的单元像素(unit pixel)。此外,单元像素可进一步包括白色像素或者可包括其他变化。
根据示例,多个像素P中的每一个可包括具有驱动晶体管的像素电路和连接到像素电路的发光器件。
每个像素P的发光器件可插置在连接到像素电路的第一电极(例如阳极电极)与连接到公共电源的第二电极(例如阴极电极)之间。根据示例,发光器件可包括有机发光器件、量子点发光器件、无机发光器件或微型发光二极管器件。这种发光器件可以与从像素电路提供的数据电流的量成比例地发光,从而发出具有预定亮度的彩色光。
每个像素P的像素电路可基于扫描信号和控制信号通过控制在发光器件中流动的驱动电流来驱动发光器件。下文将参照图2至图4D详细描述每个像素P的像素电路的一个构造示例。
时序控制器300可基于图像信号产生与多个像素P中的每一个对应的像素数据。时序控制器300可基于时序同步信号产生数据控制信号,并且将数据控制信号提供给数据驱动电路500。根据示例,时序控制器300可基于时序同步信号产生包括起始信号和多个扫描时钟信号的扫描控制信号,并且将扫描控制信号提供给扫描驱动电路700。时序控制器300可进一步根据扫描驱动电路700的驱动方法产生多个进位时钟信号,并且将所产生的进位时钟信号提供给扫描驱动电路700。
数据驱动电路500可连接到设置在显示面板100中的多条数据线DL。数据驱动电路500可接收从时序控制器300提供的像素数据和数据控制信号,并且可接收从电源电路提供的多个基准伽马电压。数据驱动电路500可使用数据控制信号和多个基准伽马电压针对每个像素将像素数据转换为模拟型数据信号,并且针对每个像素将转换的数据信号提供给相应的数据线DL。
扫描驱动电路700可连接到设置在显示面板100中的多条扫描线SL。例如,扫描驱动电路700可基于从时序控制器300提供的扫描控制信号根据预定顺序产生扫描信号,并且将所产生的扫描信号提供给相应的扫描线SL。
根据示例,扫描驱动电路700可根据薄膜晶体管(TFT)的制造工艺集成在基板的一个边缘或两个边缘上,并且以一一对应的方式连接到多条扫描线SL。例如,扫描驱动电路700可形成在集成电路中并且安装在基板上或者安装在柔性电路膜上,并且扫描驱动电路700连接到多条扫描线SL中的每一条。
图2是示出图1中所示的显示设备中的每个像素P的示例的电路图。
参照图2并且如上所述,多个像素P中的每一个可包括具有驱动晶体管Tdr(例如驱动TFT)的像素电路PC和连接到像素电路PC的发光器件LED(例如有机发光二极管)。
像素电路PC可通过控制在发光器件LED中流动的驱动电流ILED来驱动发光器件LED。根据示例,像素电路PC可包括驱动晶体管Tdr、第一初始化晶体管Ti1和第二初始化晶体管Ti2、数据提供晶体管Tds、第一发光控制晶体管Tec1和第二发光控制晶体管Tec2、以及第一电容器C1和第二电容器C2。
驱动晶体管Tdr可控制在发光器件LED中流动的驱动电流ILED。驱动晶体管Tdr可选择性地连接第三节点N3和第一节点N1。例如,驱动晶体管Tdr可设置在第三节点N3和第一节点N1之间,以将驱动电流ILED选择性地提供给发光器件LED。例如,驱动晶体管Tdr的漏极电极可连接到第三节点N3,驱动晶体管Tdr的源极电极可连接到第一节点N1,并且驱动晶体管Tdr的栅极电极可连接到第四节点N4。
驱动晶体管Tdr的漏极电极可通过第三节点N3连接到第二发光控制晶体管Tec2的源极电极和第二初始化晶体管Ti2的漏极电极。驱动晶体管Tdr的源极电极可通过第一节点N1连接到第一发光控制晶体管Tec1的漏极电极和数据提供晶体管Tds的源极电极。驱动晶体管Tdr的栅极电极可通过第四节点N4连接到第二初始化晶体管Ti2的源极电极和第一电容器C1的一端。因此,驱动晶体管Tdr可基于第四节点N4的电压导通,并且将从第三节点N3提供的驱动电流ILED提供给第一节点N1。
第一初始化晶体管Ti1可基于第一扫描信号SC1(n)导通,以电连接电压供给线VL和第二节点N2,其中n可以是诸如正整数之类的自然数。在此,电压供给线VL可对应于或者可以是给第二节点N2提供初始化电压Vini的初始化线。例如,第一初始化晶体管Ti1的漏极电极可连接到用于接收初始化电压Vini的电压供给线VL,第一初始化晶体管Ti1的源极电极可连接到第二节点N2,并且第一初始化晶体管Ti1的栅极电极可连接到用于接收第一扫描信号SC1(n)的第一扫描线SL1。
第一初始化晶体管Ti1的漏极电极可从电压供给线VL接收初始化电压Vini。第一初始化晶体管Ti1的源极电极可通过第二节点N2连接到第一发光控制晶体管Tec1的源极电极、第一电容器C1的另一端、第二电容器C2的另一端和发光器件LED的阳极电极。第一初始化晶体管Ti1的栅极电极可从第一扫描线SL1接收第一扫描信号SC1(n)。因此,第一初始化晶体管Ti1可基于第一扫描信号SC1(n)导通,并且将初始化电压Vini选择性地提供给第二节点N2。
第二初始化晶体管Ti2可基于第一扫描信号SC1(n)导通,以电连接第三节点N3和第四节点N4。例如,第二初始化晶体管Ti2的漏极电极可连接到第三节点N3,第二初始化晶体管Ti2的源极电极可连接到第四节点N4,并且第二初始化晶体管Ti2的栅极电极可连接到第一扫描线SL1。
第二初始化晶体管Ti2的漏极电极可通过第三节点N3连接到第二发光控制晶体管Tec2的源极电极和驱动晶体管Tdr的漏极电极。第二初始化晶体管Ti2的源极电极可通过第四节点N4连接到驱动晶体管Tdr的栅极电极和第一电容器C1的一端。第二初始化晶体管Ti2的栅极电极可从第一扫描线SL1接收第一扫描信号SC1(n)。因此,第二初始化晶体管Ti2可基于第一扫描信号SC1(n)导通,并且将第三节点N3处的电压选择性地提供给第四节点N4。
数据提供晶体管Tds可基于第二扫描信号SC2(n)导通,以电连接数据线DL和第一节点N1。例如,数据提供晶体管Tds的漏极电极可连接到用于接收数据电压Vdata的数据线DL,数据提供晶体管Tds的源极电极可连接到第一节点N1,数据提供晶体管Tds的栅极电极可连接到用于接收第二扫描信号SC2(n)的第二扫描线SL2。
数据提供晶体管Tds的漏极电极可从数据线DL接收数据电压Vdata。数据提供晶体管Tds的源极电极可通过第一节点N1连接到驱动晶体管Tdr的源极电极和第一发光控制晶体管Tec1的漏极电极。数据提供晶体管Tds的栅极电极可从第二扫描线SL2接收第二扫描信号SC2(n)。因此,数据提供晶体管Tds可基于第二扫描信号SC2(n)导通,并且将数据电压Vdata提供给第一节点N1。
第一发光控制晶体管Tec1可基于第一发光信号EM1导通,以电连接第一节点N1和第二节点N2。例如,第一发光控制晶体管Tec1的漏极电极可以连接到第一节点N1,第一发光控制晶体管Tec1的源极电极可连接到第二节点N2,并且第一发光控制晶体管Tec1的栅极电极可连接到用于接收第一发光信号EM1的第一发光控制线EML1。
第一发光控制晶体管Tec1的漏极电极可通过第一节点N1连接到驱动晶体管Tdr的源极电极和数据提供晶体管Tds的源极电极。第一发光控制晶体管Tec1的源极电极可通过第二节点N2连接到第一电容器C1的另一端、第二电容器C2的另一端、第一初始化晶体管Ti1的源极电极和发光器件LED的阳极电极。第一发光控制晶体管Tec1的栅极电极可从第一发光控制线EML1接收第一发光信号EM1。因此,第一发光控制晶体管Tec1可基于第一发光信号EM1导通,并且将第一节点N1处的电压选择性地提供给第二节点N2。
第二发光控制晶体管Tec2可基于第二发光信号EM2导通,以将驱动电源EVDD电连接到第三节点N3。例如,第二发光控制晶体管Tec2的漏极可连接到驱动电源EVDD,第二发光控制晶体管Tec2的源极电极可连接到第三节点N3,并且第二发光控制晶体管Tec2的栅极电极可连接到用于接收第二发光信号EM2的第二发光控制线EML2。
第二发光控制晶体管Tec2的漏极电极可从驱动电源EVDD接收驱动电压VDD。第二发光控制晶体管Tec2的源极电极可通过第三节点N3连接到驱动晶体管Tdr的漏极电极和第二初始化晶体管Ti2的漏极电极。第二发光控制晶体管Tec2的栅极电极可从第二发光控制线EML2接收第二发光信号EM2。因此,第二发光控制晶体管Tec2可基于第二发光信号EM2导通,并且将驱动电压VDD选择性地提供给第三节点N3。
第一电容器C1可连接在第四节点N4和第二节点N2之间。例如,第一电容器C1可通过在第四节点N4和第二节点N2之间存储差电压来控制第四节点N4的电压。例如,即使第二初始化晶体管Ti2截止,第四节点N4的电压也可通过第一电容器C1的一端与另一端之间的电位差保持恒定。结果,即使第二初始化晶体管Ti2截止,第一电容器C1也可保持第四节点N4的电压恒定,从而控制驱动晶体管Tdr的操作。
第二电容器C2可连接在第二扫描线SL2和第二节点N2之间。例如,第二电容器C2可通过在第二扫描线SL2和第二节点N2之间存储差电压来控制第二节点N2的电压。例如,当从第二扫描线SL2提供的第二扫描信号SC2(n)上升时,第二电容器C2可升高第二节点N2的电压,并且当第二扫描信号SC2(n)下降时,第二电容器C2可使第二节点N2的电压降低。结果,可以与第二扫描信号SC2(n)的上升时间或下降时间同步地(例如,以相同的方式)控制第二节点N2的电压。
图3是例示图2中所示的显示设备的像素中的像素电路和发光器件的驱动的波形图,图4A至图4D是示出在图2中所示的显示设备的像素中,像素电路和发光器件根据初始化时段、编程时段、采样时段和发光时段的驱动的示图。
参照图3和图4A至图4D,可通过初始化时段P1、编程时段P2、采样时段P3和发光时段P4来驱动多个像素P中的每一个。
第一扫描线SL1可连接到第一初始化晶体管Ti1的栅极电极和第二初始化晶体管Ti2的栅极电极。例如,第一扫描线SL1可将第一扫描信号SC1(n)提供给第一初始化晶体管Ti1和第二初始化晶体管Ti2的栅极电极,以分别导通或截止第一初始化晶体管Ti1和第二初始化晶体管Ti2。在此,第一扫描信号SC1(n)可在初始化时段P1和采样时段P3中具有高电平并且在编程时段P2和发光时段P4中具有低电平。因此,第一初始化晶体管Ti1可在初始化时段P1和采样时段P3中接收到具有高电平的第一扫描信号SC1(n)时导通,并且将初始化电压Vinit提供给第二节点N2。第二初始化晶体管Ti2可在初始化时段P1和采样时段P3中接收到具有高电平的第一扫描信号SC1(n)时导通,并且将节点N3的电压提供给第四节点N4。
第二扫描线SL2可连接到数据提供晶体管Tds的栅极电极。例如,第二扫描线SL2可将第二扫描信号SC2(n)提供给数据提供晶体管Tds的栅极电极,以导通或截止数据提供晶体管Tds。在此,第二扫描信号SC2(n)可在编程时段P2和采样时段P3中具有高电平并且在初始化时段P1和发光时段P4中具有低电平。因此,数据提供晶体管Tds可在编程时段P2和采样时段P3期间接收到具有高电平的第二扫描信号SC2(n)时导通,并且将数据电压Vdata提供给第一节点N1。
第一发光控制线EML1可连接到第一发光控制晶体管Tec1的栅极电极。例如,第一发光控制线EML1可将第一发光信号EM1提供给第一发光控制晶体管Tec1的栅极电极,以导通或截止第一发光控制晶体管Tec1。在此,第一发光信号EM1可在发光时段P4中具有高电平并且在初始化时段P1、编程时段P2和采样时段P3中具有低电平。因此,第一发光控制晶体管Tec1可在发光时段P4期间接收到具有高电平的第一发光信号EM1时导通,并且将第一节点N1的电压提供给第二节点N2。
第二发光控制线EML2可连接到第二发光控制晶体管Tec2的栅极电极。例如,第二发光控制线EML2可将第二发光信号EM2提供给第二发光控制晶体管Tec2的栅极电极,以导通或截止第二发光控制晶体管Tec2。在此,第二发光信号EM2可在初始化时段P1和发光时段P4期间具有高电平并且在编程时段P2和采样时段P3期间具有低电平。因此,第二发光控制晶体管Tec2可在初始化时段P1和发光时段P4期间接收到具有高电平的第二发光信号EM2时导通,并且将驱动电压VDD提供给第三节点N3。
在图4A中,可基于第一扫描信号SC1(n)在初始化时段P1期间导通第一初始化晶体管Ti1,以将初始化电压Vini提供给第二节点N2。例如,作为发光器件的阳极的第二节点N2可在初始化时段P1期间接收到初始化电压Vini时被初始化。
第二发光控制晶体管Tec2可基于第二发光信号EM2在初始化时段P1期间导通,并且将驱动电压VDD提供给第三节点N3,并且第二初始化晶体管Ti2可基于第一扫描信号SC1(n)在初始化时段P1期间导通,并且将第三节点N3的电压提供给第四节点N4。例如,第二发光控制晶体管Tec2和第二初始化晶体管Ti2可在初始化时段P1期间同时导通,并且将驱动电压VDD提供给作为第一电容器C1的一端的第四节点N4。
如上所述,在初始化时段P1期间,可将驱动电压VDD提供给作为第一电容器C1的一端的第四节点N4,并且初始化电压Vini可提供给作为第一电容器C1的另一端的第二节点N2。例如,第一电容器C1可在初始化时段P1期间存储驱动电压VDD与初始化电压Vini之间的差电压(VDD-Vini)。
根据示例,第二节点N2的初始化电压V_N2可与第一扫描信号SC1(n)的下降时间T1同步地降低(见Drop1)。例如,像素电路PC可进一步包括连接在第一初始化晶体管Ti1的栅极电极和第二节点N2之间的内部电容器(未示出)。例如,内部电容器的一端可连接到第一初始化晶体管Ti1的栅极电极,并且内部电容器的另一端可连接到第二节点N2。在此,第一扫描信号SC1(n)可在初始化时段P1的起始时间上升以具有高电平,并且内部电容器可在内部电容器的两端之间存储差电压。第一扫描信号SC1(n)可在初始化时段P1的结束时间下降以具有低电平,并且内部电容器可基于所存储的电位差来使第二节点N2的电压V_N2降低。因此,第二节点N2的电压V_N2可与第一扫描信号SC1(n)的下降时间T1同步地具有低于初始化电压Vini的电压。
在图4B中,第一初始化晶体管Ti1和第二初始化晶体管Ti2以及第一发光控制晶体管Tec1和第二发光控制晶体管Tec2可截止。数据提供晶体管Tds可基于第二扫描信号SC2(n)在编程时段P2期间导通,并且将数据电压Vdata提供给第一节点N1。因此,可将数据电压Vdata连续地提供给作为驱动晶体管Tdr的源极电极的第一节点N1。
在图4C中,数据提供晶体管Tds甚至可基于第二扫描信号SC2(n)在采样时段P3期间导通,并且第一初始化晶体管Ti1和第二初始化晶体管Ti2可基于第一扫描信号SC1(n)在采样时段P3期间导通。在此,作为驱动晶体管Tdr的栅极电极的第四节点N4在采样时段P3之前可具有由第一电容器C1存储的驱动电压VDD,并且作为驱动晶体管Tdr的源极电极的第一节点N1可具有在紧接在前的编程时段P2期间提供的数据电压Vdata。例如,驱动晶体管Tdr的栅极-源极电压Vgs可对应于驱动电压VDD与数据电压Vdata之间的差电压(VDD-Vdata),并且驱动晶体管Tdr的栅极-源极电压Vgs可高于阈值电压Vth,以便被导通。因此,在采样时段P3期间驱动晶体管Tdr首先导通的时刻,可根据驱动电压VDD、数据电压Vdata和驱动晶体管Tdr的阈值电压Vth确定驱动晶体管Tdr的漏极-源极电流Ids(Ids=k*(VDD-Vdata-Vth)2)。驱动晶体管Tdr可以将漏极-源极电流Ids提供给第一节点N1,直到栅极-源极电压Vgs达到驱动晶体管Tdr的阈值电压Vth为止。以这种方式,第四节点N4的电压和驱动晶体管Tdr的漏极-源极电流Ids可自当驱动晶体管Tdr在采样时段P3期间首次被导通时的时刻起改变,并且第四节点N4的电压可会聚成(converged)数据电压Vdata和驱动晶体管Tdr的阈值电压Vth的加和电压(Vdata+Vth)。
根据示例,第二节点N2的电压V_N2可与采样时段P3的第一扫描信号SC1(n)的下降时间T2同步地降低(见Drop2)。例如,像素电路PC可进一步包括连接在第一初始化晶体管Ti1的栅极电极与第二节点N2之间的内部电容器(未示出)。例如,内部电容器的一端可连接到第一初始化晶体管Ti1的栅极电极,并且内部电容器的另一端可连接到第二节点N2。在此,内部电容器可保持在初始化时段P1中存储的电位差,并且第一扫描信号SC1(n)可在采样时段P3的结束时间降低以具有低电平。因此,内部电容器可基于所存储的电位差来使第二节点N2的电压V_N2降低。因此,第二节点N2的电压V_N2可与第一扫描信号SC1(n)的下降时间T2同步地具有低于初始化电压Vini的电压。
根据示例,第二电容器C2可与第二扫描信号SC2(n)的下降时间T3同步地降低(见Drop3)第二节点N2的电压V_N2。例如,第二节点N2的电压V_N2可与采样时段P3的第一扫描信号SC1(n)的下降时间T2同步地降低(见Drop2),并且随后可进一步在采样时段P3之后与第二扫描信号SC2(n)的下降时间T3同步地降低(见Drop3)。例如,第二电容器C2的一端可连接到第二扫描线SL2,而第二电容器C2的另一端可连接到第二节点N2。在此,第二扫描信号SC2(n)可在编程时段P2的起始时间上升以具有高电平,并且第二电容器C2可在第二电容器C2的两端之间存储差电压。第二扫描信号SC2(n)可在采样时段P3之后降低到具有低电平,并且第二电容器C2的一端处的电压可降低。因此,第二电容器C2可基于所存储的电位差使作为第二电容器C2的另一端的第二节点N2的电压V_N2降低。
根据示例,当数据电压Vdata具有预定的最小值时,第二电容器C2可在发光时段P4期间使第二节点N2的电压V_N2降低到发光器件LED的阈值电压Vth或更低。例如,当在第二节点N2中充入的电压V_N2在紧接在发光时段P4之前为高时,在发光时段P4中第二节点N2的电压可增加到高于发光器件LED的阈值电压Vth,由此发光器件LED可发光。在相关技术的发光显示设备中,即使当数据电压具有可在驱动电路***中实现的最小值时,发光器件的阳极电极的电压也增加到高于发光器件的阈值电压,由此,发光器件会轻微发光,从而导致不能实现深黑色的问题。
为了解决与相关技术有关的这种限制,根据本发明的显示设备包括连接在第二扫描线SL2与作为发光器件LED的阳极电极的第二节点N2之间的第二电容器C2,从而减少紧接在发光时段P4之前被充入到第二节点N2的电压V_N2。例如,第二节点N2的电压V_N2可与采样时段P3的第一扫描信号SC1(n)的下降时间T2同步地降低(见Drop2),并且第二电容器C2可在采样时段P3之后与第二扫描信号SC2(n)的下降时间T3同步地使第二节点N2的电压再次降低(见Drop3)。因此,通过包括第二电容器C2,根据本发明的显示设备可在有效确保数据电压裕度的同时,使第二节点N2的电压V_N2降低到发光器件LED的阈值电压Vth或更低并且实现深黑色。
在图4D中,第一发光控制晶体管Tec1可基于第一发光信号EM1在发光时段P4期间导通,并且将第一节点N1的电压提供给第二节点N2,第二发光控制晶体管Tec2可基于第二发光信号EM2在发光时段P4期间导通,并且将驱动电压VDD提供给第三节点N3。作为驱动晶体管Tdr的栅极电极的第四节点N4可在发光时段P4之前具有由第一电容器C1存储的数据电压Vdata和驱动晶体管Tdr的阈值电压Vth的加和电压(Vdata+Vth),并且驱动晶体管Tdr的栅极-源极电压Vgs可增加到大于阈值电压Vth以便导通。因此,第二发光控制晶体管Tec2、驱动晶体管Tdr和第一发光控制晶体管Tec1可在发光时段P4期间导通,并且将驱动电流ILED提供给发光器件LED。
根据示例,驱动晶体管Tdr的漏极-源极电流Ids可通过第一发光控制晶体管Tec1提供给发光器件LED。例如,第一发光控制晶体管Tec1可基于驱动晶体管Tdr的漏极-源极电流Ids将驱动电流ILED提供给发光器件LED。因此,驱动电流ILED可由驱动晶体管Tdr的漏极-源极电流Ids确定。驱动晶体管Tdr的漏极-源极电流Ids可在发光时段P4期间驱动晶体管Tdr首次导通的时刻,由以下等式确定:
Ids=k*(Vgs–Vth)2=k*(Vdata+Vth-Vini-Vth)2=k*(Vdata-Vini)2
在此,k对应于常数。例如,驱动电流ILED可由数据电压Vdata确定,并且可不受驱动晶体管Tdr的阈值电压Vth的影响。因此,根据本发明的显示设备在内部补偿驱动晶体管Tdr的阈值电压Vth的特性,由此消除了多个像素之间发生的驱动晶体管Tdr的电特性偏差,从而消除了像素之间的亮度偏差。结果,根据本发明的显示设备可通过补偿驱动晶体管Tdr的阈值电压特性来保持显示面板的亮度均匀。
图5是示出发光器件根据图2中所示的显示设备的像素中的数据电压的亮度示例的曲线图。在此,第一像素电路PC1是不包括本发明的第二电容器C2的像素电路,第二像素电路PC2对应于或者是根据本发明的显示设备的像素电路。假定第一像素电路PC1和第二像素电路PC2的发光器件(LED)是相同的。
参照图5,第一像素电路PC1具有即使数据电压Vdata具有可在驱动电路***中实现的最小值Vmin,发光器件LED也轻微发光的问题,由此不能实现深黑色。
相比之下,由于根据本发明的显示设备包括连接在第二扫描线SL2与作为发光器件LED的阳极电极的第二节点N2之间的第二电容器C2,所以在紧接在发光时段P4之前被充入到第二节点N2的电压V_N2可降低,并且当数据电压Vdata具有可在驱动电路***中实现的最小值Vmin时,可有效防止发光器件LED的发光。以这种方式,由于根据本发明的显示设备包括第二电容器C2,所以当数据电压Vdata具有预定的最小值时,第二节点N2的电压V_N2可降低到发光器件LED的阈值电压Vth或更低,因而可在确保数据电压裕度的同时实现深黑色。
因此,在根据本发明的显示设备中,当数据电压具有预定的最小值时,发光器件的阳极电极的电压可降低到发光器件的阈值电压或更低,从而在确保数据电压裕度的同时,实现深黑色。此外,在根据本发明的显示设备中,通过使发光器件的阳极电极的电压与扫描信号的下降时间同步地降低,可在数据电压具有预定的最小值时防止发光器件的发光。
根据本发明的实施方式的显示设备包括:像素,所述像素包括具有驱动晶体管的像素电路和连接到所述像素电路的发光器件,其中所述像素电路包括:驱动晶体管,所述驱动晶体管控制驱动电流在所述发光器件的流动;数据提供晶体管,所述数据提供晶体管将数据电压选择性地提供给作为所述驱动晶体管的源极电极的第一节点;第一发光控制晶体管,所述第一发光控制晶体管将所述第一节点选择性地连接到作为所述发光器件的阳极电极的第二节点;第一初始化晶体管,所述第一初始化晶体管将初始化电压选择性地提供给所述第二节点;第二发光控制晶体管,所述第二发光控制晶体管将驱动电压选择性地提供给作为所述驱动晶体管的漏极电极的第三节点;第二初始化晶体管,所述第二初始化晶体管将所述第三节点选择性地连接到作为所述驱动晶体管的栅极电极的第四节点;第一电容器,所述第一电容器连接在所述第二节点和所述第四节点之间;以及第二电容器,所述第二电容器连接在所述第二节点与所述数据提供晶体管的栅极电极之间。
根据本发明的实施方式,所述像素通过初始化时段、编程时段、采样时段和发光时段被驱动,并且所述第一初始化晶体管基于从第一扫描线提供的第一扫描信号在所述初始化时段和所述采样时段期间导通,并且将所述初始化电压提供给所述第二节点。
根据本发明的实施方式,所述第二初始化晶体管基于所述第一扫描信号在所述初始化时段和所述采样时段期间导通,并且将所述第三节点的电压提供给所述第四节点。
根据本发明的实施方式,所述数据提供晶体管基于从第二扫描线提供的第二扫描信号在所述编程时段和所述采样时段期间导通,并且将所述数据电压提供给所述第一节点。
根据本发明的实施方式,所述第二电容器存储在所述第二扫描线与所述第二节点之间的差电压。
根据本发明的实施方式,所述第二电容器使所述第二节点的电压与所述第二扫描信号的下降时间同步地降低。
根据本发明的实施方式,当所述数据电压具有预定的最小值时,所述第二电容器使所述第二节点的电压降低到所述发光器件的阈值电压或更低。
根据本发明的实施方式,所述第一发光控制晶体管基于从第一发光线提供的第一发光信号在所述发光时段期间导通,并且将所述第一节点的电压提供给所述第二节点。
根据本发明的实施方式,所述第二发光控制晶体管基于从第二发光线提供的第二发光信号在所述初始化时段和所述发光时段期间导通,并且将所述驱动电压提供给所述第三节点。
本发明的上述特征、结构和效果包括在本发明的至少一个实施方式中,但不仅限于一个实施方式。此外,所属领域技术人员可通过对其他实施方式进行组合或修改来实现本发明的至少一个实施方式中描述的特征、结构和效果。因此,与组合和修改相关的内容应当解释为在本发明的范围内。
在不背离本发明的精神或范围的情况下,可在本发明中做出各种修改和变化,这对于所属领域技术人员来说将是显而易见的。因此,本发明旨在覆盖落入所附权利要求书范围及其等同范围内的对本发明的修改和变化。
Claims (15)
1.一种显示设备,包括:
用于显示图像的多个像素,
其中所述多个像素根据初始化时段、编程时段、采样时段和发光时段通过多个信号被驱动,
其中所述多个信号包括:
第一扫描信号,所述第一扫描信号在所述初始化时段和所述采样时段中具有高电平,在所述编程时段和所述发光时段中具有低电平;
第二扫描信号,所述第二扫描信号在所述编程时段和所述采样时段中具有高电平,在所述初始化时段和所述发光时段中具有低电平;以及
第一电极的电压,所述第一电极的电压与在所述初始化时段中的所述第一扫描信号的下降时间同步地降低。
2.根据权利要求1所述的显示设备,其中所述多个信号还包括:
第一发光信号,所述第一发光信号在所述发光时段中具有高电平,在所述初始化时段、所述编程时段和所述采样时段中具有低电平;
第二发光信号,所述第二发光信号在所述初始化时段和所述发光时段中具有高电平,在所述编程时段和所述采样时段中具有低电平。
3.根据权利要求1所述的显示设备,其中所述多个像素中的至少一个像素包括像素电路以及连接至所述像素电路的发光器件,
其中所述像素电路包括:
驱动晶体管,所述驱动晶体管控制驱动电流在所述发光器件流动;
数据提供晶体管,所述数据提供晶体管将数据电压选择性地提供给作为所述驱动晶体管的源极电极的第一节点;
第一发光控制晶体管,所述第一发光控制晶体管将所述第一节点选择性地连接到作为所述发光器件的一个电极的第二节点;
第一电容器,所述第一电容器连接在所述第二节点和作为所述驱动晶体管的栅极电极的第四节点之间;以及
第二电容器,所述第二电容器连接在所述第二节点与所述数据提供晶体管的栅极电极之间。
4.根据权利要求3所述的显示设备,其中所述像素电路还包括:
第一初始化晶体管,所述第一初始化晶体管将初始化电压选择性地提供给所述第二节点。
5.根据权利要求4所述的显示设备,其中所述像素电路还包括:
第二发光控制晶体管,所述第二发光控制晶体管将驱动电压选择性地提供给作为所述驱动晶体管的漏极电极的第三节点;以及
第二初始化晶体管,所述第二初始化晶体管将所述第三节点选择性地连接到所述第四节点。
6.根据权利要求5所述的显示设备,其中
所述第一初始化晶体管基于从第一扫描线提供的第一扫描信号在所述初始化时段和所述采样时段期间导通,并且将所述初始化电压提供给所述第二节点。
7.根据权利要求6所述的显示设备,其中
所述数据提供晶体管基于从第二扫描线提供的第二扫描信号在所述编程时段和所述采样时段期间导通,并且将所述数据电压提供给所述第一节点。
8.根据权利要求7所述的显示设备,其中
在所述数据电压具有预定的最小值时,所述第二电容器使所述第二节点的电压降低到所述发光器件的阈值电压或更低。
9.一种显示设备,包括:
用于显示图像的多个像素,
其中所述多个像素根据初始化时段、编程时段、采样时段和发光时段通过多个信号被驱动,
其中所述多个信号包括:
第一扫描信号,所述第一扫描信号在所述初始化时段和所述采样时段中具有高电平,在所述编程时段和所述发光时段中具有低电平;
第二扫描信号,所述第二扫描信号在所述编程时段和所述采样时段中具有高电平,在所述初始化时段和所述发光时段中具有低电平;以及
第一电极的电压,所述第一电极的电压与在所述采样时段中的所述第一扫描信号的下降时间同步地降低。
10.根据权利要求9所述的显示设备,其中
所述第一电极的电压进一步地在所述采样时段之后与所述第二扫描信号的下降时间同步地降低。
11.根据权利要求9所述的显示设备,其中所述多个信号还包括:
第一发光信号,所述第一发光信号在所述发光时段中具有高电平,在所述初始化时段、所述编程时段和所述采样时段中具有低电平;
第二发光信号,所述第二发光信号在所述初始化时段和所述发光时段中具有高电平,在所述编程时段和所述采样时段中具有低电平。
12.根据权利要求9所述的显示设备,其中
所述多个像素中的至少一个像素包括像素电路以及连接至所述像素电路的发光器件,
其中所述像素电路包括:
驱动晶体管,所述驱动晶体管控制驱动电流在所述发光器件流动;
数据提供晶体管,所述数据提供晶体管将数据电压选择性地提供给作为所述驱动晶体管的源极电极的第一节点;
第一发光控制晶体管,所述第一发光控制晶体管将所述第一节点选择性地连接到作为所述发光器件的一个电极的第二节点;
第一电容器,所述第一电容器连接在所述第二节点和作为所述驱动晶体管的栅极电极的第四节点之间;以及
第二电容器,所述第二电容器连接在所述第二节点与所述数据提供晶体管的栅极电极之间。
13.根据权利要求12所述的像素电路,其中
在所述数据电压具有预定的最小值时,所述第二电容器使所述第二节点的电压降低到所述发光器件的阈值电压或更低。
14.一种显示设备,包括:
用于显示图像的多个像素,
其中所述多个像素根据初始化时段、编程时段、采样时段和发光时段通过多个信号被驱动,
其中所述多个信号包括:
第一扫描信号,所述第一扫描信号在所述初始化时段和所述采样时段中具有高电平,在所述编程时段和所述发光时段中具有低电平;
第二扫描信号,所述第二扫描信号在所述编程时段和所述采样时段中具有高电平,在所述初始化时段和所述发光时段中具有低电平;以及
第一电极的电压,所述第一电极的电压在所述采样时段之后与所述第二扫描信号的下降时间同步地降低。
15.根据权利要求14所述的显示设备,其中所述多个信号还包括:
第一发光信号,所述第一发光信号在所述发光时段中具有高电平,在所述初始化时段、所述编程时段和所述采样时段中具有低电平;
第二发光信号,所述第二发光信号在所述初始化时段和所述发光时段中具有高电平,在所述编程时段和所述采样时段中具有低电平。
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US20210193030A1 (en) | 2021-06-24 |
GB2582052A (en) | 2020-09-09 |
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GB2594150B (en) | 2022-11-16 |
US11386842B2 (en) | 2022-07-12 |
GB2582052B (en) | 2021-05-05 |
GB201919020D0 (en) | 2020-02-05 |
KR102564366B1 (ko) | 2023-08-04 |
US10971064B2 (en) | 2021-04-06 |
CN111383591B (zh) | 2022-08-26 |
DE102019135074A1 (de) | 2020-07-02 |
KR20200082964A (ko) | 2020-07-08 |
KR20230118787A (ko) | 2023-08-14 |
CN111383591A (zh) | 2020-07-07 |
GB202103547D0 (en) | 2021-04-28 |
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