CN104575392A - 像素驱动电路及其驱动方法 - Google Patents

像素驱动电路及其驱动方法 Download PDF

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CN104575392A
CN104575392A CN201510053217.3A CN201510053217A CN104575392A CN 104575392 A CN104575392 A CN 104575392A CN 201510053217 A CN201510053217 A CN 201510053217A CN 104575392 A CN104575392 A CN 104575392A
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transistor
unit
pole
voltage
pixel
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CN104575392B (zh
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青海刚
祁小敬
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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Priority to US14/912,522 priority patent/US9824633B2/en
Priority to PCT/CN2015/085395 priority patent/WO2016123937A1/zh
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    • G09G3/22Control 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
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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]
    • G09G3/3208Control 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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    • G09G3/3225Control 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
    • G09G3/3258Control 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 with pixel circuitry controlling the voltage across the light-emitting element
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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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    • G09G3/22Control 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
    • G09G3/30Control 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
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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

本发明提供了一种像素驱动电路及其驱动方法。该像素驱动电路包括:数据信号输入单元,用于提供数据电压;发光单元,用于进行发光显示;发光控制单元,连接至发光单元,用于在像素驱动显示阶段控制发光单元的发光;参考电压提供单元,用于提供参考电压;驱动单元,分别连接至参考电压提供单元和发光控制单元,用于接收参考电压提供单元提供的参考电压,并在像素驱动显示阶段通过所述发光控制单元来驱动所述发光单元;以及阈值电压补偿单元,分别连接至数据信号输入单元和驱动单元,用于在阈值电压补偿阶段,使得向所述驱动单元的栅极提供的电压能够补偿所述驱动单元的阈值电压并准确地控制驱动单元的驱动电流。

Description

像素驱动电路及其驱动方法
技术领域
本发明涉及显示领域,具体地涉及一种像素驱动电路及其驱动方法。
背景技术
AMOLED(有源矩阵有机发光二极管)显示器因具有视角光、色彩对比效果好、响应速度块以及成本低等优点,从而获得了广泛应用。AMOLED能够发光是由驱动薄膜晶体管(Thin Film Transistor,TFT)在饱和时产生的电流所驱动。不管是LTPS(低温多晶硅)工艺还是氧化物工艺,由于工艺的不均匀性,薄膜晶体管背板在工艺过程中不同位置的驱动薄膜晶体管的阈值电压(Vth)的均匀性非常差,同时Vth也有漂移,这对于电流驱动器件的一致性来说是致命的。因为在输入相同的灰阶电压时,不同的阈值电压会产生不同的驱动电流,造成电流的不一致。因此传统的AMOLED驱动电路包含两个薄膜晶体管和一个存储电容(简称2T1C),该电路亮度均匀性一直很差。图1示出了2TIC电路的框图,图2示出了该2TIC电路的操作时序图。
发明内容
本发明提供了一种像素驱动电路及其驱动方法,用以解决现有技术中由于驱动晶体管的阈值电压差异而导致在接收到相同数据电压时流经不同有机发光二极管的电流不均匀从而造成整个面板显示不均匀的问题。
为了解决上述问题,本发明提供了一种像素驱动电路,包括:
数据信号输入单元,用于提供数据电压;
发光单元,用于进行发光显示;
发光控制单元,连接至发光单元,用于在像素驱动显示阶段控制发光单元的发光;
参考电压提供单元,用于提供参考电压;
驱动单元,分别连接至参考电压提供单元和发光控制单元,用于接收参考电压提供单元提供的参考电压,并在像素驱动显示阶段通过所述发光控制单元来驱动所述发光单元;以及
阈值电压补偿单元,分别连接至数据信号输入单元和驱动单元,用于在阈值电压补偿阶段,使得向所述驱动单元的栅极提供的电压能够补偿所述驱动单元的阈值电压并准确地控制驱动单元的驱动电流。
优选地,所述发光单元包括用于发光的有机发光二极管,所述有机发光二极管的第一极与所述发光控制单元连接,第二极与高电压端连接。
优选地,所述数据信号输入单元包括第一晶体管,所述第一晶体管的栅极与第一控制信号端连接,第一极与数据信号端连接,第二极与所述阈值电压补偿单元连接。
优选地,所述驱动单元包括驱动晶体管,所述驱动晶体管的栅极与所述阈值电压补偿单元连接,第一极与所述发光控制单元连接,第二极与所述参考电压提供单元连接,以通过所述发光控制单元向所述发光单元提供与所述阈值电压无关的恒定驱动电流。
优选地,所述发光控制单元包括第二晶体管、第四晶体管和第五晶体管,所述第二晶体管的栅极与第二控制信号端连接,第一极与所述第一晶体管的第二极连接,第二极与所述驱动晶体管的第二极连接;所述第四晶体管的栅极与所述第二控制信号端连接,第一极与所述驱动晶体管的第二极连接,第二极与所述发光单元连接;所述第五晶体管的栅极与第三控制信号端连接,第一极与所述驱动晶体管的第一极连接,第二极与低电压端连接。
优选地,所述阈值补偿单元包括第一电容器和第三晶体管,所述第一电容器的第一端与所述数据信号输入单元连接,第二端与所述驱动晶体管的栅极连接;所述第三晶体管的栅极与所述第一控制信号端连接,第一极与所述驱动晶体管的第一极连接,第二极与所述第一电容器的第二端连接。
优选地,所述参考电压提供单元包括第六晶体管,所述第六晶体管的栅极与第一控制信号端连接,第一极与参考电压端连接,第二极与所述驱动晶体管的第二极连接,所述参考电压提供单元将参考电压直接提供给所述驱动晶体管,使得在所述驱动晶体管用作二极管连接时,参考电压通过所述驱动晶体管对所述驱动晶体管的栅极充电,使得所述驱动晶体管与所述第一电容器之间节点的电压等于参考电压与所述驱动晶体管的阈值电压之差。
优选地,所述数据信号输入单元将数据电压直接写入所述第一电容器,使得所述第一电容器两端的电压等于所述数据电压减去所述参考电压与所述驱动晶体管的阈值电压之差。
优选地,所述第一晶体管、第二晶体管、第三晶体管、第四晶体管、第五晶体管、第六晶体管以及驱动晶体管是P型薄膜晶体管,或N型薄膜晶体管。
本发明还提供了一种应用于上述像素驱动电路的驱动方法,包括:
初始化步骤,初始化驱动单元的栅极,为参考电压的写入创造条件;
阈值电压补偿步骤,在将参考电压通过驱动单元写入阈值单元补偿单元的同时,将数据电压写入阈值电压补偿单元,使得所述阈值补偿单元向所述驱动单元的栅极提供的电压能够补偿所述驱动单元的阈值电压,并且准确地控制驱动单元的驱动电流;以及
像素驱动显示步骤,通过发光控制单元驱动发光单元进行发光。
优选地,所述初始化步骤包括:控制所述第一晶体管、所述第三晶体管、所述第五晶体管和所述第六晶体管导通,控制所述第二晶体管和所述第四晶体管截止,使得通过驱动晶体管的二极管连接方式,对驱动晶体管的栅极进行初始化。
优选地,所述阈值电压补偿步骤包括:控制所述第一晶体管、所述第三晶体管和所述第六晶体管导通,控制所述所述第二晶体管、所述第四晶体管和所述第五晶体管截止,使得参考电压通过驱动单元对第一电容充电,直到驱动单元自动截止。
优选地,所述像素驱动显示步骤包括:控制所述第二晶体管、所述第四晶体管、所述第五晶体管导通,并且控制所述第一晶体管,所述第三晶体管和所述第六晶体管截止,以通过所述发光控制单元向发光单元提供与驱动单元的阈值电压无关的恒定驱动电流。
优选地,所述方法在所述初始化步骤之前还包括准备步骤,所述准备步骤包括:控制所述第五晶体管导通,控制所述第一晶体管、所述第二晶体管、所述第三晶体管、所述第四晶体管、所述第六晶体管截止,以为数据电压写入第一电容器做准备。
优选地,所述方法在所述像素驱动显示步骤之前还包括缓冲步骤,所述缓冲步骤包括:控制所述第一晶体管、所述第二晶体管、所述第三晶体管、所述第四晶体管、所述第五晶体管和所述第六晶体管截止。
本发明的像素驱动电路通过从驱动晶体管的源极输入参考电压并利用驱动晶体管的二极管连接方式将驱动晶体管的阈值电压写入存储电容,使得该像素驱动电路具备能够补偿驱动晶体管的阈值电压的驱动显示功能。即,通过处于饱和状态的二极管将阈值电压写入电容器以提供驱动晶体管栅源电压,使得驱动晶体管的驱动电流与驱动晶体管的阈值电压和有机发光二极管(OLED)的开启电压无关,从而提高了显示面板的亮度均匀性和可靠性。
附图说明
根据结合附图的以下详细描述,本公开的多个实施例的上述和其他方面、特征以及优点将更清楚,附图中:
图1是现有的2TIC电路的框图;
图2是图1的2TIC电路的操作时序图;
图3是根据本发明实施例的像素驱动电路的结构框图;
图4是根据本发明实施例的像素驱动电路的驱动方法的流程图;
图5是根据本发明另一实施例的像素驱动电路的结构框图;
图6是根据本发明另一实施例的像素驱动电路的时序图;以及
图7a-f是图6的时序图中各个阶段的等效电路图。
具体实施方式
为了使本领域技术人员能够更好地理解本发明的技术方案,下面结合附图和具体实施例进行详细描述。
参照图3,图1是根据本发明实施例的像素驱动电路100的结构框图。像素驱动电路100包括:数据信号输入单元101、发光单元102、发光控制单元103、参考电压提供单元104、驱动单元105、以及阈值电压补偿单元106。
数据信号输入单元101分别连接至数据信号端Data、第一控制信号端S(n)和阈值电压补偿单元106,用于接收数据信号,并向阈值电压补偿单元106提供数据电压Vdata。
发光单元102分别连接至发光控制单元103和高电压端ELVDD,包括用于发光的有机发光二极管(OLED),并且用于进行发光显示。
发光控制单元103分别连接至发光单元102、驱动单元105、第二控制信号端EM(n)、第三控制信号端EM(n+1)和低电压端ELVSS,用于在像素驱动显示阶段控制发光单元102的发光。
参考电压提供单元104分别连接至参考电压端ref、驱动单元105和第一控制信号端S(n),用于接收并向驱动单元105提供参考电压Vref。
驱动单元105分别连接至参考电压提供单元104、发光控制单元103和阈值电压补偿单元106,用于接收参考电压提供单元104提供的参考电压Vref,并在像素驱动显示阶段向通过发光控制单元103向发光单元102提供与驱动单元105的阈值电压Vth无关的驱动电流。
阈值电压补偿单元106分别连接至数据信号输入单元101和驱动单元105,接收数据信号输入单元104提供的数据电压Vdata,并且用于在阈值电压补偿阶段,保持驱动单元105用于二极管连接时来自源极对栅极充电的电位。从而使得向驱动单元105提供的电压能够补偿驱动单元105的阈值电压Vth。
优选地,高电压端ELVDD输出的电压大于低电压端ELVSS输出的电压。
本实施例提供的像素驱动电路具备能够补偿驱动晶体管的阈值电压的驱动显示功能。该像素驱动电路中的阈值电压补偿单元106在阈值电压补偿阶段向驱动单元105的栅极提供的电压能够对驱动单元105的阈值电压Vth进行补偿,并且驱动单元105在像素驱动显示阶段向发光控制单元102提供与驱动单元105的阈值电压Vth和OLED的开启电压无关的驱动电流。实现了显示面板驱动电流的一致性,从而提高了显示面板的亮度均匀性和可靠性。
参照图4,图4是根据本发明实施例的像素驱动电路100的驱动方法的流程图,该驱动方法包括以下步骤:
初始化步骤201,对驱动单元105的栅极进行初始化,使得驱动单元105开启,以便为参考电压Vref的写入创造条件;
阈值电压补偿步骤202,在将参考电压Vref通过驱动单元105写入阈值电压补偿单元106的同时,将数据电压写入阈值电压补偿单元106,使得所述阈值补偿单元106向所述驱动单元105的栅极提供的电压能够补偿驱动单元105的阈值电压;以及
像素驱动显示步骤203,通过发光控制单元103驱动发光单元102进行发光。
在阈值电压补偿步骤202期间,继续将数据电压Vdata写入阈值电压补偿单元106,同时将驱动单元105的阈值电压Vth和驱动单元105从参考电压提供单元105接收的参考电压也写入阈值电压补偿单元106,直到驱动单元105自动截止。因此在以上数据写入完成之后,阈值电压补偿单元106可以向驱动单元105提供电压(即,驱动单元105的栅源电压):Vata-(Vref-|Vth|)。从而在像素驱动显示步骤203期间,驱动单元105向发光控制单元105提供与驱动单元105的阈值电压Vth无关的驱动电流。进而保持显示面板的驱动电流一致性,并且提高显示面板的亮度均匀性和可靠性。
在像素驱动显示步骤203期间,发光控制单元103开启,连通驱动单元105和发光单元102,驱动单元105为发光单元102提供恒定的发光电流。
参照图5,图5是根据本发明另一实施例的像素驱动电路500的结构框图。像素驱动电路500包括:数据信号输入单元501、发光单元502、发光控制单元503、参考电压提供单元504、驱动单元505、以及阈值电压补偿单元506。
数据信号输入单元501用于接收数据信号,并向阈值电压补偿单元506提供数据电压Vdata。
发光单元502用于进行发光显示。
发光控制单元503用于在像素驱动显示阶段控制发光单元502的发光。
参考电压提供单元504用于接收并向驱动单元505提供参考电压Vref。
驱动单元505用于接收参考电压提供单元504提供的参考电压Vref,并在像素驱动显示阶段向发光控制单元502提供不受驱动单元505的阈值电压Vth影响的驱动电流。
阈值电压补偿单元506接收数据信号输入单元501提供的数据电压Vdata,并且用于在阈值电压补偿阶段,对驱动单元505的阈值电压进行补偿。
下面对上述各个单元的具体结构进行说明。
数据信号输入单元501包括第一晶体管T1。发光单元502包括用于发光的有机发光二极管(OLED)。发光控制单元503包括第二晶体管T2、第四晶体管T4和第五晶体管T5。参考电压提供单元504包括第六晶体管T6。驱动单元505包括驱动晶体管DTFT。阈值补偿单元506包括第一电容器Cst和第三晶体管T3。
有机发光二极管的第一极与第四晶体管T4的第一极连接,第二极与高电压端ELVDD连接。
第一晶体管T1的栅极与第一控制信号端S(n)连接,第一极与数据信号端连接,第二极与第一电容器Cst的第一端连接。
驱动晶体管DTFT的栅极与第一电容器Cst的第二端连接,第一极与第五晶体管T5的第一极连接,第二极与第六晶体管T6的第二极连接。
第二晶体管T2的栅极与第二控制信号端EM(n)连接,第一极与第一电容器Cst的第一端连接,第二极与驱动晶体管DTFT的第二极连接。
第四晶体管T4的栅极与第二控制信号端EM(n)连接,第一极与驱动晶体管DTFT的第二极连接,第二极与有机发光二极管的第一极连接。
第五晶体管T5的栅极与第三控制信号端EM(n+1)连接,第一极与驱动晶体管DTFT的第一极连接,第二极与低电压端ELVSS连接。
第一电容器Cst的第一端与第一晶体管T1的第二极连接,第二端与驱动晶体管DTFT的栅极连接。
第三晶体管T3的栅极与第一控制信号端S(n)连接,第一极与驱动晶体管DTFT的第一极连接,第二极与第一电容器Cst的第二端连接。
第六晶体管的栅极与第一控制信号端S(n)连接,第一极与参考电压端ref,连接第二极与驱动晶体管DTFT的第二极连接。
在本实施例中,像素驱动电路500由7个薄膜晶体管和一个存储电容器组成,这7个薄膜晶体管可以均为N型薄膜晶体管,也可以均为P型薄膜晶体管,或者可以是这二者的组合。在本实施例中,像素驱动电路500中7个薄膜晶体管均为P型薄膜晶体管,其中,T1~T6为开关晶体管,DTFT为驱动薄膜晶体管,ELVDD、ELVSS和ref均输出三个直流电平,并且高电压端ELVDD输出的电压大于低电压端ELVSS输出的电压。因此当控制信号为高电平时,开关薄膜晶体管截止,当控制信号为低电平时,开关薄膜晶体管导通。优选地,T1~T6和DTFT的第一极可以是源极,第二极可以漏极,然而第一极也可以是漏极,第二极也可以是源极。
在本实施例中,参考电压提供单元504将参考电压Vref直接提供给驱动晶体管DTFT的源极,同时数据信号输入单元501将数据电压Vdata直接写入第一电容器Cst。因此参考电压Vref通过驱动晶体管DTFT不断对第一电容器Cst充电,N点电位不断上升,直到N点电位为Vref-|Vth|为止。此时驱动晶体管DTFT截止,同时数据电压Vdata的写入也完成,因此第一电容器Cst两端的电压为Vcst=Vdata-(Vref-|Vth|)。这样使得该像素驱动电路具备能够补偿驱动晶体管DTFT的阈值电压Vth的功能。即,通过驱动晶体管用作二极管连接的方式将阈值电压Vth写入第一电容器Cst,使得驱动晶体管的阈值电压得到补偿,驱动电流与驱动晶体管的阈值电压无关,从而提高了显示面板的亮度均匀性和可靠性。
下面结合图5、图6和图7a-f具体描述根据本发明另一示例实施例的像素驱动电路的操作。图6是根据本发明另一实施例的像素驱动电路500的时序图;以及图7a-f是图6的时序图中各个阶段的等效电路图。
参照图6,像素驱动电路500的操作分为6个阶段,即,①准备阶段、②初始化阶段、③阈值电压补偿阶段、④第一缓冲阶段、⑤第二缓冲阶段和⑥像素驱动显示阶段。
在准备阶段,为将数据电压Vdata写入第一电容器Cst做准备。具体地,将第一控制信号S(n)、第二控制信号EM(n)设置为高电平,并将第三控制信号EM(n+1)设置为低电平,因此,晶体管T5导通,晶体管T1、T2、T3、T4和T6截止。由于晶体管T4处于截止状态,因此有机发光二极管(OLED)处于非工作状态。准备阶段的等效电路图参见图7a。
在初始化阶段,向驱动晶体管提供参考电压Vref,同时开始将数据电压Vdata写入第一电容器Cst。具体地,在该阶段期间,将第二控制信号EM(n)设置为高电平,并且将第一控制信号S(n)和第三控制信号EM(n+1)设置为低电平。这样,晶体管T1、T3、T5和T6导通,晶体管T2和T4截止。参考电压Vref从M点给入,驱动晶体管DTFT作为二极管连接并导通,因此N点电位被初始化为较低电位,同时数据电压Vdata被写入第一电容器Cst。初始化阶段的等效电路图参见图7b。
在阈值电压补偿阶段,将第二控制信号EM(n)和第三控制信号EM(n+1)设置为高电平,将第一控制信号S(n)设置为低电平。这样,晶体管T1、T3和T6导通,晶体管T2、T4和T5截止。继续将数据电压Vdata写入第一电容器Cst,同时将驱动晶体管DTFT的阈值电压Vth也写入第一电容器Cst。由于晶体管T5截止,因此DTFT仍然作为二极管连接,N点电位由于在初始化阶段被初始化到较低电位,因此参考电压Vref通过驱动晶体管DTFT不断对第一电容器Cst充电,N点电位不断上升,直到N点电位为Vref-|Vth|为止。此时驱动晶体管DTFT截止,同时数据电压Vdata的写入也完成,因此存储电容Cst两端的电压为Vcst=Vdata-(Vref-|Vth|)。阈值电压补偿阶段的等效电路图参见图7c。
在第一缓冲阶段,将第一控制信号S(n)、第二控制信号EM(n)和第三控制信号EM(n+1)设置为高电平,因此晶体管T1、T2、T3、T4、T5、T6截止。在该阶段所有信号都写入完毕,用于缓冲以避免开关信号同时切换引起不必要的噪声。第一缓冲阶段的等效电路参见图7d。
在第二缓冲阶段,将第一控制信号S(n)和第三控制信号EM(n+1)设置为高电平,将第二控制信号EM(n)设置为低电平,因此晶体管T2和T4导通,晶体管T1、T3、T5和T6截止。该阶段仍为缓冲阶段,以避免开关信号同时切换引起不必要的噪声。第二缓冲阶段的等效电路参见图7e。
在像素驱动显示阶段,驱动发光控制单元502进行对发光单元501的发光显示控制。具体地,在该阶段期间,将第一控制信号S(n)设置为高电平,并将第二控制信号EM(n)和第三控制信号EM(n+1)设置为低电平。这样,晶体管T2、T4和T5导通,晶体管T1、T3和T6截止。在该阶段,驱动晶体管DTFT栅源电压就是第一电容器Cst两端的电压,因此DTFT的栅源电压Vsg=Vcst=Vdata-(Vref-|Vth|)。通过有机发光二极管OLED的发光电流由驱动晶体管DTFT的栅源电压Vsg决定,该发光电流由下式给出。
Ioled=K(Vsg-|Vth|)^2=K[Vdata-(Vref-|Vth|)-|Vth|]^2
=K(Vdata-Vref)^2
由上式可以知道,OLED的发光电流仅与参考电压Vref和数据电压Vdata有关系,而与驱动晶体管的阈值电压Vth没有关系,K为与工艺和设计相关的常数,由于Vdata大于等于Vref,因此Ioled最小为0,此时表示处于0灰阶。像素驱动显示阶段的等效电路参见图7f。
本实施例的操作方法消除了驱动晶体管DTFT的阈值电压Vth的影响,使得驱动晶体管的驱动电流与驱动晶体管的阈值电压和OLED的开启电压无关,从而达到电流的一致。进而提高了显示面板的亮度均匀性和可靠性。
显然,本领域的技术人员可以在不脱离本发明的精神和范围的前提下对本发明的实施例进行各种改变和修改。本发明的范围由所附权利要求及其等同物来限定。

Claims (15)

1.一种像素驱动电路,包括:
数据信号输入单元,用于提供数据电压;
发光单元,用于进行发光显示;
发光控制单元,连接至发光单元,用于在像素驱动显示阶段控制发光单元的发光;
参考电压提供单元,用于提供参考电压;
驱动单元,分别连接至参考电压提供单元和发光控制单元,用于接收参考电压提供单元提供的参考电压,并在像素驱动显示阶段通过所述发光控制单元来驱动所述发光单元;以及
阈值电压补偿单元,分别连接至数据信号输入单元和驱动单元,用于在阈值电压补偿阶段,使得向所述驱动单元的栅极提供的电压能够补偿所述驱动单元的阈值电压并准确地控制所述驱动单元的驱动电流。
2.根据权利要求1所述的像素驱动电路,其中,所述发光单元包括用于发光的有机发光二极管,所述有机发光二极管的第一极与所述发光控制单元连接,第二极与高电压端连接。
3.根据权利要求2所述的像素驱动电路,其中,所述数据信号输入单元包括第一晶体管,所述第一晶体管的栅极与第一控制信号端连接,第一极与数据信号端连接,第二极与所述阈值电压补偿单元连接。
4.根据权利要求3所述的像素驱动电路,其中,所述驱动单元包括驱动晶体管,所述驱动晶体管的栅极与所述阈值电压补偿单元连接,第一极与所述发光控制单元连接,第二极与所述参考电压提供单元连接,以通过所述发光控制单元向所述发光单元提供与所述阈值电压无关的恒定驱动电流。
5.根据权利要求4所述的像素驱动电路,其中,所述发光控制单元包括第二晶体管、第四晶体管和第五晶体管,所述第二晶体管的栅极与第二控制信号端连接,第一极与所述第一晶体管的第二极连接,第二极与所述驱动晶体管的第二极连接;所述第四晶体管的栅极与所述第二控制信号端连接,第一极与所述驱动晶体管的第二极连接,第二极与所述发光单元连接;所述第五晶体管的栅极与第三控制信号端连接,第一极与所述驱动晶体管的第一极连接,第二极与低电压端连接。
6.根据权利要求5所述的像素驱动电路,其中,所述阈值补偿单元包括第一电容器和第三晶体管,所述第一电容器的第一端与所述数据信号输入单元连接,第二端与所述驱动晶体管的栅极连接;所述第三晶体管的栅极与所述第一控制信号端连接,第一极与所述驱动晶体管的第一极连接,第二极与所述第一电容器的第二端连接。
7.根据权利要求6所述的像素驱动电路,其中,所述参考电压提供单元包括第六晶体管,所述第六晶体管的栅极与第一控制信号端连接,第一极与参考电压端连接,第二极与所述驱动晶体管的第二极连接,所述参考电压提供单元将参考电压直接提供给所述驱动晶体管,使得在所述驱动晶体管用作二极管连接时,参考电压通过所述驱动晶体管对所述驱动晶体管的栅极充电,从而所述驱动晶体管与所述第一电容器之间节点的电压等于参考电压与所述驱动晶体管的阈值电压之差。
8.根据权利要求7所述的像素驱动电路,其中,所述数据信号输入单元将数据电压直接写入所述第一电容器,使得所述第一电容器两端的电压等于所述数据电压减去所述参考电压与所述驱动晶体管的阈值电压之差。
9.根据权利要求3至8中任一项所述的像素驱动电路,其中,所述第一晶体管、第二晶体管、第三晶体管、第四晶体管、第五晶体管、第六晶体管以及驱动晶体管是P型薄膜晶体管,或N型薄膜晶体管。
10.一种应用于权利要求1至9中任一项所述的像素驱动电路的驱动方法,包括:
初始化步骤,初始化驱动单元的栅极,为参考电压的写入创造条件;
阈值电压补偿步骤,在将参考电压通过驱动单元写入阈值单元补偿单元的同时,将数据电压写入阈值电压补偿单元,使得所述阈值补偿单元向所述驱动单元的栅极提供的电压能够补偿所述驱动单元的阈值电压,并且准确地控制驱动单元的驱动电流;以及
像素驱动显示步骤,通过发光控制单元驱动发光单元进行发光。
11.根据权利要求10所述的驱动方法,其中,所述初始化步骤包括:控制所述第一晶体管、所述第三晶体管、所述第五晶体管和所述第六晶体管导通,控制所述第二晶体管和所述第四晶体管截止,使得通过驱动晶体管的二极管连接方式,对驱动晶体管的栅极进行初始化。
12.根据权利要求11所述的驱动方法,其中,所述阈值电压补偿步骤包括:控制所述第一晶体管、所述第三晶体管和所述第六晶体管导通,控制所述所述第二晶体管、所述第四晶体管和所述第五晶体管截止,使得参考电压通过驱动单元对第一电容充电,直到驱动单元自动截止。
13.根据权利要求12所述的驱动方法,其中,所述像素驱动显示步骤包括:控制所述第二晶体管、所述第四晶体管、所述第五晶体管导通,并且控制所述第一晶体管,所述第三晶体管和所述第六晶体管截止,以通过所述发光控制单元向发光单元提供与驱动单元的阈值电压无关的恒定驱动电流。
14.根据权利要求13所述的驱动方法,其中,所述方法在所述初始化步骤之前还包括准备步骤,所述准备步骤包括:控制所述第五晶体管导通,控制所述第一晶体管、所述第二晶体管、所述第三晶体管、所述第四晶体管、所述第六晶体管截止,以为数据电压写入第一电容器做准备。
15.根据权利要求14所述的驱动方法,其中,所述方法在所述像素驱动显示步骤之前还包括缓冲步骤,所述缓冲步骤包括:控制所述第一晶体管、所述第二晶体管、所述第三晶体管、所述第四晶体管、所述第五晶体管和所述第六晶体管截止。
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