CN103927990A - 有机发光显示器的像素电路及驱动方法、有机发光显示器 - Google Patents

有机发光显示器的像素电路及驱动方法、有机发光显示器 Download PDF

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CN103927990A
CN103927990A CN201410166379.3A CN201410166379A CN103927990A CN 103927990 A CN103927990 A CN 103927990A CN 201410166379 A CN201410166379 A CN 201410166379A CN 103927990 A CN103927990 A CN 103927990A
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light emitting
transistor
sweep signal
organic light
current potential
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CN103927990B (zh
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胡小叙
张丽
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Tianma Microelectronics Co Ltd
Wuhan Tianma Microelectronics Co Ltd
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Tianma Microelectronics Co Ltd
Shanghai Tianma AM OLED Co Ltd
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Priority to US14/480,524 priority patent/US9805656B2/en
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    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
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    • G09G3/32Control 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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    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10OLED displays
    • H10K59/12Active-matrix OLED [AMOLED] displays
    • H10K59/131Interconnections, e.g. wiring lines or terminals
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    • G09G2300/00Aspects of the constitution of display devices
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Abstract

本发明涉及有机发光显示技术领域,尤其涉及一种有机发光显示器的像素电路及驱动方法、有机发光显示器;其中所述有机发光显示器的像素电路包括:驱动晶体管、第一晶体管、第二晶体管、第三晶体管、第四晶体管、第一电容、第二电容、发光二极管和补偿二极管,其中补偿二极管补偿发光二极管的衰减,亦即是阈值电压的升高。本发明提供的技术方案,利用补偿二极管补偿发光二极管在使用过程中出现的衰减,使得有机发光显示器在使用过程中,在驱动电压不变的情况下,仍能使发光二极管保持稳定且有效的亮度,保证了有机发光显示器中像素电路的正常工作,进而保证了有机发光显示器在显示画面、图像等过程中保持较高的显示质量。

Description

有机发光显示器的像素电路及驱动方法、有机发光显示器
技术领域
本发明涉及有机发光显示技术领域,尤其涉及一种有机发光显示器的像素电路及驱动方法、有机发光显示器。
背景技术
随着多媒体技术的不断发展,应用于有机发光显示技术中的有机发光二极管(Organic Light Emitting Diode,简称OLED)已越来越多的被应用于高性能的有机发光显示器中。对于采用有机发光二极管的有机发光显示器,是通过控制流经有机发光二极管的电流大小,达到控制有机发光二极管的显示亮度,进而利用不同的显示亮度来实现有机发光显示器显示不同灰阶的效果。
现有技术中,随着有机发光显示器使用周期的延续,有机发光显示器长时间点亮后,各像素电路中的有机发光二极管会出现不同程度的衰减,进而使得有机发光二极管的阈值电压升高。当有机发光二极管的阈值电压升高后,在相同的驱动电压作用下,流经有机发光二极管的电流会下降,进而使得有机发光二极管的显示亮度降低,使有机发光显示器的显示质量下降,并进一步缩短有机发光显示器的使用寿命。
发明内容
有鉴于此,本发明实施例提供了一种有机发光显示器的像素电路及驱动方法、有机发光显示器。
在第一方面,本发明实施例提供了一种有机发光显示器,包括:驱动晶体管,所述驱动晶体管的栅极连接于第一节点;第一晶体管,其漏极连接于所述驱动晶体管的源极,其源极接收第一电源信号;其栅极接收第一扫描信号,所述第一扫描信号用于控制第一晶体管的通断;第二晶体管,其漏极连接于所述驱动晶体管的源极,其源极连接于所述第一节点,其栅极接收第二扫描信号,所述第二扫描信号用于控制第二晶体管的通断;第一电容,其第一端子连接于所述第一节点,其第二端子连接于第二节点;第二电容,其第一端子连接于所述第一节点,其第二端子连接于第三节点;第三晶体管,其漏极连接于所述第三节点,其源极接收数据信号;其栅极接收第三扫描信号,所述第三扫描信号用于控制第三晶体管的通断;第四晶体管,其源极连接于所述第二节点,其栅极接收第四扫描信号,所述第四扫描信号用于控制第四晶体管的通断;发光二极管,其正极连接于所述第二节点,其负极接收第二电源信号;补偿二极管,其正极连接于所述第四晶体管的漏极,其负极接收所述第二电源信号。
在第二方面,本发明实施例提供了一种像素电路的驱动方法,应用于在第一方面所述的有机发光显示器的像素电路,包括:施加第一电源信号至第一节点的初始化阶段;使第一节点处电位为发光二极管和驱动晶体管的阈值电压和,第二节点处电位为发光二极管的阈值电压的阈值电压抓取阶段;使第三节点处电位为数据信号的电位,第二节点处电位为补偿二极管阈值电压,以及使第一节点的电位由数据信号及补偿二极管和发光二极管阈值电压差确定的数据写入及补偿阶段;驱动晶体管驱动发光二极管发光的发光阶段。
在第三方面,本发明实施例提供了一种有机发光显示器,包括:在第一方面所述的有机发光显示器的像素电路。
本发明实施例提供的有机发光显示器的像素电路,像素电路的驱动方法及有机发光显示器存在如下优点至少的一个:
本发明实施例提供的有机发光显示器的像素电路包含有一补偿二极管,在封装时其具有和发光二极管相同的阈值电压,并且随着使用周期的延续,不会出现衰减的现象。因此,本发明实施例提供的像素电路,在有机发光显示器中各像素电路每次进行驱动显示时,获取补偿二极管和发光二极管的阈值电压差,并将获取的阈值电压差补偿至驱动晶体管的栅极,以此补偿了发光二极管在长时间点亮后所呈现的衰减现象(亦即是阈值电压的升高)。因补偿二极管的补偿作用,保证了流经发光二极管电流的稳定性,进而在长时间点亮后仍能保证发光二极管亮度的稳定性。因发光二极管亮度的稳定性且有效性,保证了有机发光显示器图像显示的质量。
因有机发光显示器的像素电路具有上述有益效果,则使用此像素电路的有机发光显示器及此像素电路的驱动方法,也至少具有保证有机发光显示器图像、视频等显示质量的效果。
附图说明
此处所说明的附图用来提供对本发明的进一步理解,构成本发明的一部分,并不构成对本发明的限定。在附图中:
图1示出的是本发明实施例一中像素电路结构的示意图;
图1a示出的是本发明实施例一中像素电路驱动信号的时序示意图;
图1b示出的是图1a中的M1阶段时像素电路等效结构的示意图;
图1c示出的是图1a中的M2阶段时像素电路等效结构的示意图;
图1d示出的是图1a中的M3阶段时像素电路等效结构的示意图;
图1e示出的是图1a中的M4阶段时像素电路等效结构的示意图;
图2示出的是本发明实施例二中有机发光显示器的像素电路的驱动方法流程示意图;
图3示出的是本发明实施例三中有机发光显示器的结构示意图。
具体实施方式
下面结合附图及具体实施例对本发明进行更加详细与完整的说明。可以理解的是,此处所描述的具体实施例仅用于解释本发明,而非对本发明的限定。另外还需要说明的是,为了便于描述,附图中仅示出了与本发明相关的部分而非全部内容。
有机发光显示器通常包括一显示面板,显示面板由一定数量的像素电路构成。在进行图像、视频等的显示时,通过驱动像素电路中的发光二极管发亮(有机发光二极管发光),进而使得显示面板显示不同的灰阶,达到显示图像的目的。因此,保证发光二极管每次显示维持足够的亮度,对于保证有机发光显示器的显示质量就很重要。但是,当像素电路中发光二极管长时间点亮后,发光二极管会出现衰减的现象,使得发光二极管的阈值电压升高,进而使流经发光二极管的电流下降。当流经发光二极管的电流下降后,发光二极管的显示亮度就会降低,使得有机发光显示器显示质量降低。本发明是基于此问题提出了对有机发光显示器像素电路的改善。
图1示出的是本发明实施例一中像素电路结构的示意图;参考图1,本实施例中有机发光显示器的像素电路包括:驱动晶体管Tc、第一晶体管T1、第二晶体管T2、第三晶体管T3、第四晶体管T4、第一电容C1、第二电容C2、发光二极管OLED和补偿二极管OLEDref;同时,参考图1,还示出了第一扫描信号线11、第二扫描信号线12、第三扫描信号线13、第四扫描信号线14和数据线10;其中,第一扫描信号线11提供第一扫描信号CI1,第二扫描信号线12提供第二扫描信号CI2、第三扫描信号线13提供第三扫描信号CI3、第四扫描信号线14提供第四扫描信号CI4以及数据线10提供数据信号Data。
参考图1,驱动晶体管Tc的栅极连接于第一节点N1。
第一晶体管T1的漏极连接于驱动晶体管Tc的源极,第一晶体管T1的源极接收第一电源信号VDD;第一晶体管T1的栅极接收第一扫描信号CI1,第一扫描信号CI1用于控制第一晶体管T1的通断。具体的,第一晶体管T1的栅极连接于第一扫描信号线11,以接收第一扫描信号CI1。
第二晶体管T2的漏极连接于驱动晶体管Tc的源极,第二晶体管T2的源极连接于第一节点N1,第二晶体管T2的栅极接收第二扫描信号CI2,第二扫描信号CI2用于控制第二晶体管T2的通断。具体的,第二晶体管T2的栅极连接于第二扫描信号线12,以接收第二扫描信号。
第一电容C1的第一端子连接于第一节点N1,第一电容C1的第二端子连接于第二节点N2。
第二电容C2的第一端子连接于第一节点N1,第二电容C2的第二端子连接于第三节点N3。
第三晶体管T3的漏极连接于第三节点N3,第三晶体管T3的源极接收数据信号Data;第三晶体管T3的栅极接收第三扫描信号CI3,第三扫描信号CI3用于控制第三晶体管T3的通断。具体的,第三晶体管T3的源极连接于数据信号线10,以接收数据信号Data;第三晶体管T3的栅极连接于第三扫描信号线13,以接收第三扫描信号CI3。
第四晶体管T4的源极连接于第二节点N2,第三晶体管T4的栅极接收第四扫描信号CI4,第四扫描信号CI4用于控制第四晶体管T4的通断。具体的,第四晶体管T4的栅极连接于第四扫描信号线14,以接收第四扫描信号CI4。
发光二极管OLED的正极连接于第二节点N2,发光二极管OLED的负极接收第二电源信号VSS。
补偿二极管OLEDref的正极连接于第四晶体管T4的漏极,补偿二极管OLEDref的负极接收第二电源信号VSS。本实施例中,补偿二极管OLEDref以同发光二极管OLED相同的规格进行封装,并且在封装时具有相同的阈值电压。在有机发光显示器的使用过程中,补偿二极管OLEDref的阈值电压并不会随着使用周期的延续而出现变化。以此,在有机发光显示器的使用过程中,能提供一个准确的参考依据,进而实现对发光二极管OLED的衰减进行补偿,保证有机发光二极管OLED每次显示都维持稳定、正常的亮度。
图1a示出的是本发明实施例一中像素电路驱动信号的时序示意图;参考图1a,本实施例中,有机发光显示器的像素电路在驱动信号作用下,具体工作流程实现如下:
初始化阶段,亦即是M1阶段;第一扫描信号CI1和第二扫描信号CI2分别控制第一晶体管T1和第二晶体管T2导通,第一节点N1处的电位被初始化为第一电源信号VDD的电位。
具体的,参考图1、图1a和图1b,第一扫描信号CI1、第二扫描信号CI2和第三扫描信号CI3为高电平,第四扫描信号CI4为低电平。第一扫描信号CI1、第二扫描信号CI2和第三扫描信号CI3分别控制第一晶体管T1、第二晶体管T2和第三晶体管T3导通,第四扫描信号CI4控制第四晶体管T4断开。参考图1b,第一电源信号VDD经导通的第一晶体管T1和第二晶体管T2传输至第一节点N1处,以使第一节点N1处电位被初始化为第一电源信号VDD的电位,亦即是第一节点电位VN1=VDD,并存储于第一电容C1,其中,VDD为第一电源信号VDD的电位;同时第一节点N1处电位控制驱动晶体管Tc导通。
阈值电压抓取阶段,亦即是M2阶段;第一扫描信号CI1控制第一晶体管T1关断,第一电容C1沿第二晶体管T2和驱动晶体管Tc放电,直至第一节点N1处电位为发光二极管OLED和驱动晶体管Tc的阈值电压和,第二节点N2处电位为发光二极管OLED的阈值电压。
具体的,参考图1、图1a和图1c,第一扫描信号CI1跳转为低电平,第二扫描信号CI2和第三扫描信号CI3维持高电平,第四扫描信号CI4维持高电平。低电平的第一扫描信号CI1控制第一晶体管T1关断,进而使得第一电源信号不再施加于像素电路。此时,参考图1c,第一电容C1、第二晶体管T2和驱动晶体管Tc形成通路,第一电容C1中存储的电荷经第一节点N1沿第二晶体管T2和导通的驱动晶体管Tc放电,以使第一节点N1处电位:
VN1=Vth-OLED+Vth
第二节点处电位:
VN2=Vth-OLED;其中,Vth为驱动晶体管Tc的阈值电压,Vth-OLED为发光二极管的阈值电压。
数据写入及补偿阶段,亦即是M3阶段;第四扫描信号CI4控制第四晶体管T4导通,第三节点N3处电位为数据信号Data的电位,第二节点N2处电位为补偿二极管OLEDref的阈值电压,第一节点N1的电位由数据信号Data及补偿二极管OLEDref和发光二极管OLED的阈值电压差确定。
具体的,参考图1、图1a和图1d,数据线10开始提供数据信号Data,第一扫描信号CI1维持低电平,第二扫描信号CI2跳转为低电平,第三扫描信号CI3维持高电平,第四扫描信号CI4跳转为高电平。参考图1d,第二扫描信号CI2控制第二晶体管T2关断,第四扫描信号CI4控制第四晶体管T4导通,第三晶体管T3、第二电容C2、第一电容C1、第四晶体管T4和补偿二极管OLEDref形成通路。在数据信号Data的作用下,节点N3的电位VN3=VData,经通路放电后节点N2的电位:
VN2=Vth-OLED-ref,其中,Vth-OLED-ref为补偿二极管的阈值电压。
因第一电容C1和第二电容C2在此阶段的电荷转移过程中,二者的电荷总量相同,根据电荷守恒定律:
[(VData-V0)-(VN1-VN1旧)]C2=[(VN1-VN1旧)-(Vth-OLED-ref-Vth-OLED)]C1
则有:
因VN2=Vth-OLED-ref,VN1旧=Vth-OLED+Vth
则有 V N 1 - V N 2 = ( V Data - V 0 + V th - OLED - V th - OLED - ref ) C 2 C 1 + C 2 + V th .
VN1旧为放电前,亦即是M2阶段的第一节点N1的电位VN1旧=Vth-OLED+Vth,V0为第三节点N3的在不提供数据信号Data时的电位。
以此,此阶段后,数据信号写入驱动晶体管Tc的栅极;同时发光二极管OLED的阈值电压和补偿二极管OLEDref阈值电压的电压差也写入了驱动晶体管Tc的栅极,补偿了像素电路中发光二极管OLED阈值电压的衰减,保证了发光二极管正常亮度显示。
发光阶段,亦即是M4阶段;第一扫描信号CI1控制第一晶体管T1导通,第二扫描信号CI2、第三扫描信号CI3及第四扫描信号CI4分别控制第二晶体管T2、第三晶体管T3和第四晶体管T4关断,驱动晶体管Tc驱动发光二极管OLED发光。
具体的,参考图1、图1a和图1e,第一扫描信号CI1跳转为高电平,第二扫描信号CI2维持低电平,第三扫描信号CI3和第四扫描信号CI4跳转为低电平。参考图1e,第一扫描信号CI1控制第一晶体管T1导通、第三扫描信号CI3和第四扫描信号CI4分别控制第三晶体管T3和第四晶体管T4关断,第一晶体管T1、驱动晶体管Tc和发光二极管OLED形成通路。在驱动晶体管Tc的栅极和源极之间的电压差(亦即是第一节点N1和第二节点N2之间的电压差)和第一电源信号VDD作用下,流经发光二极管的电流为:
I OLED = 1 2 k ( V gs - V th ) 2 = 1 2 k [ ( V Data - V 0 + V th - OLED - V th - OLED - ref ) C 2 C 1 + C 2 ] 2 ; 其中,Vgs为驱动晶体管Tc的栅极和源极的电压差。
以此,通过将补偿二极管OLEDref和发光二极管OLED的电压差补偿至驱动晶体管Tc的栅极,进而控制发光二极管OLED发光,显示图像,避免了发光二极管在使用过程中的衰减,保证了发光二极管的显示时的亮度,进而保证了有机发光显示器显示图像、视频等的质量。
可选的,在本实施例中,在初始化阶段、阈值电压抓取阶段和发光阶段不提供数据信号。具体的,可以在初始阶段、阈值电压抓取阶段和发光阶段将数据线10悬空,以实现不提供数据信号的效果。
可选的,本实施例中,第一扫描信号CI1、第二扫描信号CI2、第三扫描信号CI3和所述第四扫描信号CI4在时序上相互独立。
可选的,本实施例中,第一电源信号VDD和第二电源信号VSS的电平值恒定;其中,第一电源信号VDD的电平值为恒定的高电平,第二电源信号VSS的电平值为恒定的低电平。
需要说明的是,本实施例中,所述第一晶体管T1至第四晶体管T4和驱动晶体管Tc为NMOS管。同时在其它具体实施方式中,第一晶体管T1至第四晶体管T4和驱动晶体管Tc亦可以为PMOS管;以及当第一晶体管T1至第四晶体管T4和驱动晶体管Tc为PMOS管时,第一扫描信号至第四扫描信号反相,同时第一电源信号和第二电源信号反向。
本实施例提供的有机发光显示器的像素电路包含有一补偿二极管,在封装时其具有和发光二极管相同的阈值电压,并且随着使用周期的延续,不会出现衰减的现象。因此,本实施例提供的像素电路,在有机发光显示器中各像素电路正常进行驱动显示时,获取补偿二极管和发光二极管的阈值电压差,并将获取的阈值电压差补偿至驱动晶体管的栅极,亦即是驱动晶体管的栅极和源极的电压差为以此利用补偿二极管和发光二极管的电压差Vth-OLED-Vth-OLED-ref补偿了发光二极管在长时间点亮后所呈现的衰减现象,亦即是阈值电压的升高。因补偿二极管的补偿作用,保证了流经发光二极管的电流的稳定性,进而在长时间点亮后仍能保证发光二极管每次显示时亮度的稳定性。因发光二极管亮度的稳定性,保证了有机发光显示器图像显示的质量。
同时,因在补偿二极管的作用下,发光二极管在使用一定时期后仍能保证正常的显示亮度,进而延长了有机发光显示器的使用寿命。
图2示出的是本发明实施例二中有机发光显示器的像素电路的驱动方法流程示意图;本实施例的具体实施以实施例一中的有机发光显示器的像素电路为基础,相关概念及解释参照实施例一中的说明,本实施例中不再赘述。参考图1和图2,本实施例中像素电路的驱动方法包括:
201、施加第一电源信号CI1至第一节点N1的初始化阶段。
具体的,第一扫描信号CI2和第二扫描信号CI3分别控制第一晶体管T1和第二晶体管T2导通,第一节点N1处的电位被初始化为第一电源信号VDD的电位。
202、使第一节点N1处电位为发光二极管和驱动晶体管Tc的阈值电压和,第二节点N2处电位为发光二极管OLED的阈值电压的阈值电压抓取阶段。
具体的,第一扫描信号CI1控制所述第一晶体管T1关断,所述第一电容C1沿第二晶体管T2和驱动晶体管Tc放电,直至第一节点N1处电位为发光二极管和驱动晶体管Tc的阈值电压和,第二节点N2处电位为发光二极管的阈值电压。
203、使第三节点处N3电位为数据信号的电位,第二节点N2处电位为补偿二极管阈值电压,以及使第一节点N1的电位由数据信号及补偿二极管和发光二极管阈值电压差确定的数据写入及补偿阶段。
具体的,第四扫描信号CI4控制第四晶体管T4导通,所述第三节点N3处电位为数据信号Data的电位,所述第二节点N2处电位为补偿二极管的阈值电压,所述第一节点N1的电位由数据信号Data及补偿二极管OLEDref和发光二极管OLED的阈值电压差确定。
204、驱动晶体管Tc驱动发光二极管OLED发光的发光阶段。
具体的,第一扫描信号CI1控制第一晶体管T1导通,第二扫描信号CI2、第三扫描信号CI3及第四扫描信号CI4分别控制第二晶体管T2、第三晶体管T3和第四晶体管T4关断,驱动晶体管Tc驱动发光二极管OLED发光。
本实施例提供的有机发光显示器像素电路的驱动方法,作用于包含有一补偿二极管的像素电路,在封装时像素电路中的补偿二极管具有和发光二极管相同的阈值电压,并且随着使用周期的延续,不会出现衰减的现象。因此,本实施例提供的像素电路的驱动方法,在对有机发光显示器中各像素电路进行驱动显示时,获取补偿二极管和发光二极管的阈值电压差,并将获取的阈值电压差补偿至驱动晶体管的栅极,以此补偿了发光二极管在长时间点亮后所呈现的衰减现象,亦即是阈值电压的升高。因补偿二极管的补偿作用,保证了流经发光二极管电流的稳定性,进而在长时间点亮后仍能保证发光二极管亮度的稳定性。因发光二极管亮度的稳定性,保证了有机发光显示器图像显示的质量。
图3示出的是本发明实施例三中有机发光显示器的结构示意图;本实施例的具体实施以实施例一中的有机发光显示器的像素电路为基础,相关概念及解释参照实施例一中的说明,在本实施例中不再赘述。参考图3,本实施例中有机发光显示器包括:
扫描驱动单元31、数据驱动单元32、n条扫描线(S1、S2……、Sn)、m条数据线(D1、D2……、Dm)以及多个像素电路33;其中,在本实施例中像素电路结构同在实施例一中的像素电路结构相同,在本实施例中不再赘述。
具体的,本实施例中扫描驱动单元31,用于向各扫描线(S1、S2……、Sn)提供扫描信号;所述数据驱动单元32,用于向各数据线(D1、D2……、Dm)提供数据信号;像素电路33分别设置在通过扫描线和数据线交叉形成的像素区域上。
本实施例提供的有机发光显示器,其各像素电路包含有一补偿二极管,在封装时补偿二极管具有和发光二极管相同的阈值电压,并且随着使用周期的延续,不会出现衰减的现象。因此,本实施例提供的有机发光显示器,在有机发光显示器中各像素电路正常进行驱动显示时,获取补偿二极管和发光二极管的阈值电压差,并将获取的阈值电压差补偿至驱动晶体管的栅极,以此补偿了发光二极管在长时间点亮后所呈现的衰减现象,亦即是阈值电压的升高。因补偿二极管的补偿作用,保证了流经发光二极管电流的稳定性,进而在长时间点亮后仍能保证发光二极管亮度的稳定性。因发光二极管亮度的稳定性,保证了有机发光显示器图像显示的质量。
以上所述仅为本发明的优选实施例,并不用于限制本发明,对于本领域技术人员而言,本发明可以有各种改动和变化。凡在本发明的精神和原理之内所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。

Claims (12)

1.一种有机发光显示器的像素电路,其特征在于,包括:
驱动晶体管,所述驱动晶体管的栅极连接于第一节点;
第一晶体管,其漏极连接于所述驱动晶体管的源极,其源极接收第一电源信号;其栅极接收第一扫描信号,所述第一扫描信号用于控制第一晶体管的通断;
第二晶体管,其漏极连接于所述驱动晶体管的源极,其源极连接于所述第一节点,其栅极接收第二扫描信号,所述第二扫描信号用于控制第二晶体管的通断;
第一电容,其第一端子连接于所述第一节点,其第二端子连接于第二节点;
第二电容,其第一端子连接于所述第一节点,其第二端子连接于第三节点;
第三晶体管,其漏极连接于所述第三节点,其源极接收数据信号;其栅极接收第三扫描信号,所述第三扫描信号用于控制第三晶体管的通断;
第四晶体管,其源极连接于所述第二节点,其栅极接收第四扫描信号,所述第四扫描信号用于控制第四晶体管的通断;
发光二极管,其正极连接于所述第二节点,其负极接收第二电源信号;
补偿二极管,其正极连接于所述第四晶体管的漏极,其负极接收所述第二电源信号。
2.如权利要求1所述的有机发光显示器的像素电路,其特征在于,所述像素电路的工作状态包括:
初始化阶段,第一扫描信号和第二扫描信号分别控制第一晶体管和第二晶体管导通,第一节点处的电位被初始化为所述第一电源信号的电位;
阈值电压抓取阶段,第一扫描信号控制所述第一晶体管关断,所述第一电容沿第二晶体管和驱动晶体管放电,直至第一节点处电位为发光二极管和驱动晶体管的阈值电压和,第二节点处电位为发光二极管的阈值电压;
数据写入及补偿阶段,第四扫描信号控制所述第四晶体管导通,所述第三节点处电位为数据信号的电位,所述第二节点处电位为补偿二极管的阈值电压,所述第一节点的电位由数据信号及补偿二极管和发光二极管的阈值电压差确定;
发光阶段,第一扫描信号控制第一晶体管导通,第二扫描信号、第三扫描信号及第四扫描信号分别控制第二晶体管、第三晶体管和第四晶体管关断,驱动晶体管驱动发光二极管发光。
3.如权利要求1或2所述的有机发光显示器的像素电路,其特征在于,所述第一扫描信号、第二扫描信号、第三扫描信号和所述第四扫描信号在时序上相互独立。
4.如权利要求2所述的有机发光显示器的像素电路,其特征在于,在初始化阶段、阈值电压抓取阶段和发光阶段不提供数据信号。
5.如权利要求1所述的有机发光显示器的像素电路,其特征在于,所述第一电源信号和第二电源信号的电平值恒定。
6.如权利要求1所述的有机发光显示器的像素电路,其特征在于,所述第一晶体管至第四晶体管及驱动晶体管为NMOS管或者为PMOS管。
7.一种对权利要求1-6任一项所述的有机发光显示器的像素电路进行驱动的方法,其特征在于,包括:
施加第一电源信号至第一节点的初始化阶段;
使第一节点处电位为发光二极管和驱动晶体管的阈值电压和,第二节点处电位为发光二极管的阈值电压的阈值电压抓取阶段;
使第三节点处电位为数据信号的电位,第二节点处电位为补偿二极管阈值电压,以及使第一节点的电位由数据信号及补偿二极管和发光二极管阈值电压差确定的数据写入及补偿阶段;
驱动晶体管驱动发光二极管发光的发光阶段。
8.如权利要求7所述的有机发光显示器像素电路的驱动方法,其特征在于,所述初始化阶段包括:
第一扫描信号和第二扫描信号分别控制第一晶体管和第二晶体管导通,第一节点处的电位被初始化为所述第一电源信号的电位。
9.如权利要求7所述的有机发光显示器像素电路的驱动方法,其特征在于,所述阈值电压抓取阶段包括:
第一扫描信号控制所述第一晶体管关断,所述第一电容沿第二晶体管和驱动晶体管放电,直至第一节点处电位为发光二极管和驱动晶体管的阈值电压和,第二节点处电位为发光二极管的阈值电压。
10.如权利要求7所述的有机发光显示器像素电路的驱动方法,其特征在于,所述数据写入及补偿阶段包括:
第四扫描信号控制所述第四晶体管导通,所述第三节点处电位为数据信号的电位,所述第二节点处电位为补偿二极管的阈值电压,所述第一节点的电位由数据信号及补偿二极管和发光二极管的阈值电压差确定。
11.如权利要求7所述的有机发光显示器像素电路的驱动方法,其特征在于,所述发光阶段包括:第一扫描信号控制第一晶体管导通,第二扫描信号、第三扫描信号及第四扫描信号分别控制第二晶体管、第三晶体管和第四晶体管关断,驱动晶体管驱动发光二极管发光。
12.一种有机发光显示器,其特征在于,包括权利要求1-6中任一项所述的有机发光显示器的像素电路。
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